A nozzle assembly and air jet loom

Abstract

A nozzle assembly and air jet loom belong to the technical field of air jet loom, comprising a nozzle body, a nozzle core is detachably installed in the nozzle body, a weft yarn channel is arranged in the nozzle core, and an air inlet is arranged on the nozzle body; an airflow channel in communication with the air inlet is arranged in the nozzle body, the airflow channel is of variable cross-section structure, a plurality of turbulence plates are fixedly arranged in the airflow channel, one end of the nozzle body is provided with a yarn outlet, the yarn outlet is in communication with the airflow channel and the weft yarn channel, the variable cross-section airflow channel can naturally accelerate the airflow inside, enhance the pushing capacity of the weft yarn, and reduce energy loss, the turbulence plates can break the laminar flow state of the airflow, generate tiny turbulence, and make the airflow and the weft yarn more fully contact, solving the problem of insufficient holding force of the airflow on the weft yarn under the laminar flow state.

Description

Technical Field

[0001] This utility model relates to the field of air-jet loom technology, and in particular to a nozzle assembly and an air-jet loom. Background Technology

[0002] Air-jet looms are shuttleless looms that use jet airflow to pull the weft yarn through the shed. Their working principle is to use air as the weft-introducing medium, and the compressed airflow generated by the jet will generate frictional traction force on the weft yarn to pull it through the shed. The jet generated by the airflow achieves the purpose of weft introduction.

[0003] The nozzle of an air-jet loom includes a nozzle body and a nozzle core housed within the nozzle body. A compressed airflow channel is formed between the inner wall of the nozzle body and the outer wall of the nozzle core. A normal airflow channel is opened at the center line of the nozzle core. Both the compressed airflow channel and the normal airflow channel are connected to the yarn guide tube connected to the nozzle. A high-speed jet airflow is generated by the difference between the supply air pressure and atmospheric pressure, thereby accelerating the weft yarn into the yarn guide tube.

[0004] To improve the flight speed of the weft yarn, the compressed airflow channel in the existing nozzle assembly is generally designed with a variable cross-section structure to accelerate the airflow. However, the airflow in the variable cross-section compressed airflow channel is basically in a relatively regular laminar flow state. The contact area between the airflow and the weft yarn in the laminar flow state is relatively small, resulting in insufficient gripping force on the weft yarn. Moreover, at the variable cross-section of the flow channel, the airflow is prone to having a fast edge velocity and a slow center velocity. The uneven airflow distribution is not conducive to the stable delivery of the weft yarn, resulting in unstable weft yarn flight and making it easy to cause problems such as weft shrinkage and weft breakage. Utility Model Content

[0005] To address the technical problem in the prior art where the airflow in the compressed airflow channel of the existing nozzle assembly is in a laminar flow state, resulting in insufficient gripping force on the weft yarn and unstable weft yarn flight, this utility model provides a nozzle assembly.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides a nozzle assembly, including a nozzle body, a nozzle core detachably installed inside the nozzle body, a weft yarn channel inside the nozzle core, and an air inlet on the nozzle body. The nozzle body also has an airflow channel communicating with the air inlet. The airflow channel has a variable cross-section structure, and several turbulence deflectors are fixedly installed within it. One end of the nozzle body has a yarn outlet, which communicates with both the airflow channel and the weft yarn channel. The variable cross-section airflow channel allows the airflow to accelerate naturally within the assembly, enhancing its ability to propel the weft yarn while reducing energy loss. The turbulence deflectors disrupt the laminar flow of the airflow, generating minute turbulence, thus ensuring more thorough contact between the airflow and the weft yarn and improving the stability of the weft yarn's flight.

[0008] Preferably, the spoiler includes a head end and a tail end. The head end is close to the air inlet end of the airflow channel. The head end of the spoiler has a smooth structure and its thickness is greater than that of the tail end. One side of the spoiler is an arc side, and the other side is a flat side. The smooth head end can reduce the energy loss when the airflow impacts the spoiler, reduce the probability of airflow separation and shock wave generation, and the structure of a thick head end and a thin tail end helps to guide the airflow to form a specific turbulence pattern and improve the turbulence effect. The setting of the arc side and the flat side, with the help of Bernoulli's principle, makes the airflow generate a pressure difference when it flows through the spoiler, assisting the airflow and further optimizing the effect of the airflow on the weft yarn.

[0009] Preferably, the baffles are spaced out in the circumferential direction, which can disturb the airflow in all directions, causing the airflow in the entire flow channel to form turbulence, and strengthening the contact and interaction with the weft yarn; along the airflow direction, the angle between the baffles and the airflow direction gradually decreases, so that the airflow receives different degrees of disturbance at different stages. In the initial stage, the laminar flow is strongly broken by a large angle, and the disturbance intensity gradually weakens as the airflow accelerates, ensuring that the airflow at the outlet carries the weft yarn in a stable and efficient turbulent state.

[0010] Preferably, along the gas flow direction, the airflow channel is divided into an inlet area, a middle area, and an outlet area. Each of the inlet area, middle area, and outlet area is equipped with a few turbulence deflectors. The deflectors in the inlet area are used to initially break the laminar flow of the airflow, the middle area further stabilizes and optimizes the turbulence, and the outlet area performs final fine-tuning of the airflow to ensure that the airflow can stably carry the weft yarn out, thereby improving the overall control level of the airflow and the conveying capacity of the weft yarn.

[0011] Preferably, the flat side of the baffle in the inlet region forms an angle of 30°-40° with the airflow direction; the flat side of the baffle in the middle region forms an angle of 15°-25° with the airflow direction; and the flat side of the baffle in the outlet region forms an angle of 5°-10° with the airflow direction. The larger angle in the inlet region can forcefully cut into the airflow, quickly break the laminar flow, and form a strong initial turbulent state; the smaller angle in the middle region can sustainably stabilize and optimize the turbulence, making the airflow more orderly; and the smaller angle in the outlet region can finely adjust the basically stabilized turbulence, ensuring that the airflow carries the weft yarn in a stable and efficient state, thereby improving the stability and accuracy of the weft yarn flight.

[0012] Preferably, the spoiler has several layers, and the spoilers in adjacent layers are arranged in an alternating manner, so that the airflow can be disturbed from different angles when passing through each layer, avoiding the formation of dead zones or stagnation in local areas, comprehensively and deeply rectifying and strengthening the turbulence of the airflow, effectively improving the stability of the airflow and the ability to wrap and carry the weft yarn, and reducing the unstable factors during the flight of the weft yarn.

[0013] Preferably, the arrangement density of the deflectors gradually increases along the airflow direction. In the initial stage of airflow, the airflow is relatively stable, and the low arrangement density of the deflectors can meet the initial disturbance requirements and reduce additional resistance to the airflow. As the airflow accelerates, the gradually increasing arrangement density of the deflectors can more finely control and adjust the airflow, further enhance the turbulence effect, and ensure that the airflow carries the weft yarn in a relatively stable state at the outlet, thereby improving the airflow utilization efficiency and the conveying effect of the weft yarn.

[0014] Preferably, the air inlet of the airflow channel is larger than its outlet, which allows the airflow to enter the channel smoothly, reducing impact and turbulence. The airflow then accelerates naturally in the constricted channel, increasing the jet speed and carrying capacity of the airflow. The yarn exit end of the nozzle core is located inside the airflow channel and is close to the outlet end of the airflow channel, ensuring that the weft yarn is enveloped and carried by the accelerated and stable airflow when it leaves the nozzle core, improving the stability and accuracy of the weft yarn flight and reducing deviations during the weft yarn flight process.

[0015] This invention also provides an air-jet loom that uses the above-mentioned nozzle assembly, which can significantly improve fabric quality, reduce the occurrence of defects such as weft shrinkage and weft breakage, improve weaving efficiency, reduce downtime caused by weaving failures, and further reduce energy consumption through optimized airflow energy utilization.

[0016] As can be seen from the above technical solutions, the advantages of this utility model are:

[0017] 1. By setting up a variable cross-section airflow channel inside the nozzle body, the airflow can be naturally accelerated inside the nozzle body, enhancing the driving ability of the weft yarn, while reducing energy loss. The setting of the baffle can disrupt the laminar flow state of the airflow and generate micro turbulence, so that the airflow and the weft yarn can be in more sufficient contact, enhancing the grip of the airflow on the weft yarn, improving the stability of the weft yarn flight, and making it less prone to deviation and shaking.

[0018] 2. Along the airflow direction, the angle between the baffle and the airflow direction gradually decreases, so that the airflow is subjected to different degrees of disturbance at different stages. In the initial stage, the laminar flow is strongly broken by a large angle. Subsequently, as the airflow accelerates, the disturbance intensity gradually weakens, ensuring that the airflow at the outlet carries the weft yarn in a stable and efficient turbulent state.

[0019] 3. The spoilers are arranged in several layers, with adjacent layers staggered to allow the airflow to be disturbed from different angles when passing through each layer. This prevents the airflow from forming dead zones or stagnation in local areas, comprehensively and thoroughly rectifying and strengthening the turbulence of the airflow, effectively improving the stability of the airflow and the ability to wrap and carry the weft yarn, and reducing the instability factors during the flight of the weft yarn.

[0020] 4. Along the airflow direction, the arrangement density of the baffles gradually increases. In the initial stage of airflow, the airflow is relatively stable, and the low arrangement density of the baffles can meet the initial disturbance requirements and reduce the additional resistance to the airflow. As the airflow accelerates, the gradually increasing arrangement density of the baffles can more finely control and adjust the airflow, further enhance the turbulence effect, and ensure that the airflow carries the weft yarn in a relatively stable state at the outlet, thereby improving the airflow utilization efficiency and the conveying effect of the weft yarn. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a longitudinal sectional view of the nozzle assembly according to one or more embodiments of the present invention.

[0023] Figure 2 This is a cross-sectional structural diagram of the spoiler according to one or more embodiments of the present invention (the arrow in the figure indicates the airflow direction, and 'a' is the angle between the flat side of the spoiler and the airflow direction).

[0024] The components represented by the various reference numerals in the diagram are:

[0025] 1. Nozzle body; 2. Nozzle core; 3. Weft yarn channel; 4. Airflow channel; 5. Air inlet; 6. Yarn outlet; 7. Deflector; 8. Head end; 9. Tail end; 10. Arc side; 11. Flat side; 12. Air inlet area; 13. Middle area; 14. Air outlet area. Detailed Implementation

[0026] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0027] Example 1

[0028] In a typical embodiment of this utility model, such as Figure 1As shown, a nozzle assembly is proposed, including: a nozzle body 1, a nozzle core 2, a weft yarn channel 3, an airflow channel 4, and a minor disturbance flow plate 7. The nozzle core 2 is detachably installed inside the nozzle body 1. The weft yarn channel 3 is located inside the nozzle core 2, and the airflow channel 4 is located inside the nozzle body 1. An air inlet 5 is provided on the side wall of the nozzle body 1, which is connected to the airflow channel 4. The air inlet 5 is used to connect to a high-pressure air source, thereby introducing high-pressure air into the airflow channel 4. One end of the nozzle body 1 is provided with a yarn outlet 6, which is connected to the airflow channel 4 and the weft yarn channel 3. The weft yarn in the weft yarn channel 3 can be discharged outward from the yarn outlet 6 under the acceleration of the high-pressure airflow. The minor disturbance flow plate 7 is fixedly installed in the airflow channel 4 to disrupt the laminar flow state of the airflow and form a small turbulence. The small turbulence can better interact with the weft yarn, enhance the gripping force of the airflow on the weft yarn, and make the weft yarn more stable during flight, less prone to deviation and shaking.

[0029] Specifically, one end of the nozzle body 1 is provided with an installation port for mounting the nozzle core 2, and the other end of the nozzle body 1 is provided with a yarn outlet 6 for discharging the weft yarn. An air inlet 5 is provided on the side wall of the nozzle body 1. An airflow channel 4 is provided inside the nozzle body 1. The airflow channel 4 has a variable cross-section structure. The air inlet end of the airflow channel 4 is close to the air inlet 5 on the nozzle body 1, and the air outlet end of the airflow channel 4 is close to the yarn outlet 6 of the nozzle body 1. The size of the air inlet end of the airflow channel 4 is larger than the size of the air outlet end of the airflow channel 4. The setting of the air inlet end size being larger than the air outlet end size allows the airflow to enter the airflow channel 4 smoothly, reducing the impact and turbulence of the airflow at the air inlet end. At the air outlet end, due to the effect of the reduced cross-section, an accelerated airflow is formed, which increases the jet speed of the airflow and enhances the carrying capacity of the weft yarn. At the same time, it allows the airflow to form a natural contraction and acceleration process inside the nozzle assembly, reducing energy loss.

[0030] In this embodiment, the nozzle core 2 is directly inserted into the nozzle body 1. In other embodiments, the nozzle core 2 can also be connected to the nozzle body 1 by means of a threaded connection to improve the connection stability between the nozzle core 2 and the nozzle body 1. The specific connection method can be determined according to the actual design requirements, and no further restrictions are imposed here.

[0031] The nozzle core 2 is detachably installed inside the nozzle body 1. The yarn outlet end of the nozzle core 2 is located inside the airflow channel 4 and close to the air outlet end of the airflow channel 4. The pressurized airflow in the airflow channel 4 drives the weft yarn to accelerate into the yarn outlet 6. Since the nozzle core 2 is a detachable structure, it can be replaced according to the needs of weft yarns of different diameters, so as to select a nozzle core 2 with a suitable weft yarn channel 3 to meet the needs of different operations.

[0032] Several baffles 7 are provided. The baffles 7 are fixedly installed in the airflow channel 4 by welding or other means. The baffles 7 are arranged at intervals along the circumference. The baffles 7 are located between the side wall of the airflow channel 4 and the outer wall of the nozzle core 2, so as to disrupt the airflow layering state and form a small turbulence. The small turbulence can better interact with the weft yarn, enhance the airflow's grip on the weft yarn, and make the weft yarn more stable during flight, less prone to deviation and shaking.

[0033] like Figure 2 As shown, the two ends of the spoiler 7 are the head end 8 and the tail end 9, respectively. The head end 8 is close to the air inlet end of the airflow channel 4, and the tail end 9 is close to the air outlet end of the airflow channel 4. The head end 8 of the spoiler 7 has a smooth structure, and the thickness of the head end 8 is greater than the thickness of the tail end 9. One side of the spoiler 7 is an arc side 10, and the other side of the spoiler 7 is a flat side 11. The arc side 10 is a convex arc-shaped surface structure, and the flat side 11 is a planar structure. When the airflow passes through, it can generate a pressure difference when the airflow flows through the spoiler 7, which helps the airflow to flow orderly towards the air outlet end of the airflow channel 4, reducing airflow separation and turbulence. While reducing turbulence, the spoiler 7 does not completely eliminate turbulence, so as to form micro-turbulence. Through micro-turbulence, the interaction with the weft yarn is increased, the gripping force of the airflow on the weft yarn is enhanced, the stability of the weft yarn flight is improved, and thus the fabric quality is improved.

[0034] like Figure 1 As shown, the airflow channel 4 is divided into three regions along the gas flow direction (hereinafter referred to as the airflow direction): the inlet region 12, the middle region 13, and the outlet region 14. Each of the inlet region 12, the middle region 13, and the outlet region 14 is equipped with a small disturbance vane 7. The disturbance vane 7 forms an angle α with the airflow direction, and this angle α gradually decreases along the gas flow direction. Specifically, the flat side 11 of the small disturbance vane 7 in the inlet region 12 forms an angle α of 30°-40° with the airflow direction, effectively diverting the incoming airflow... The turbulent airflow within channel 4 is initially guided to a relatively concentrated direction, initiating the airflow rectification process. In the intermediate zone 13, the flat side 11 of the minor interference vane 7 forms an angle α of 15°-25° with the airflow direction. By gradually decreasing the angle, the airflow is gradually sorted out, forming a more regular and parallel airflow bundle, further stabilizing the airflow state. In the outlet zone 14, the flat side 11 of the minor interference vane 7 forms an angle α of 5°-10° with the airflow direction, performing final fine-tuning of the airflow to ensure that the airflow is ejected in a stable and concentrated state, powerfully carrying the weft yarn during flight.

[0035] Understandably, in practical applications, the angle α between the spoiler 7 and the airflow in different regions can be determined according to actual design requirements, and no further restrictions are imposed here.

[0036] To avoid dead zones or stagnation in local areas and to improve the rectification effect, the baffles 7 in each area are divided into several layers. That is, the baffles 7 in the inlet area 12, the middle area 13 and the outlet area 14 are respectively arranged in several layers along the airflow direction, and the baffles 7 in adjacent layers are staggered to ensure that the airflow is combed and guided from different angles when passing through each layer of baffles 7, thereby improving the stability of weft yarn flight and avoiding problems such as weft shrinkage and weft breakage.

[0037] In this embodiment, along the airflow direction, the arrangement density of the baffles 7 gradually increases. That is, the distance between adjacent baffles 7 near the air inlet end of the airflow channel 4 is greater than the distance between adjacent baffles 7 near the air outlet end of the airflow channel 4. The large distance between adjacent baffles 7 near the air inlet end of the airflow channel 4 allows the airflow to have enough space for initial directional adjustment. The distance between the baffles 7 gradually decreases, and the arrangement density is greater, which enables more precise sorting and control of the initially stable airflow, thereby improving the stability and concentration of the airflow.

[0038] Example 2

[0039] In another typical embodiment of this utility model, an air-jet loom is proposed, which employs the nozzle assembly mentioned in Embodiment 1 for traction of the weft yarn by generating frictional traction force through high-speed jet airflow.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A nozzle assembly, comprising: The nozzle body (1) has a nozzle core (2) that can be detachably installed inside the nozzle body (1). The nozzle core (2) is characterized by having a weft channel (3) inside and an air inlet (5) on the nozzle body (1). The nozzle body (1) is provided with an airflow channel (4) that is connected to the air inlet (5). The airflow channel (4) has a variable cross-section structure. A small interference flow plate (7) is fixedly provided in the airflow channel (4). One end of the nozzle body (1) is provided with a yarn outlet (6). The yarn outlet (6) is connected to the airflow channel (4) and the weft channel (3).

2. The nozzle assembly according to claim 1, characterized in that, The spoiler (7) includes a head end (8) and a tail end (9). The head end (8) is close to the air intake end of the airflow channel (4). The head end (8) of the spoiler (7) has a smooth structure and the thickness of the head end (8) is greater than that of the tail end (9). One side of the spoiler (7) is an arc side (10) and the other side of the spoiler (7) is a flat side (11).

3. The nozzle assembly according to claim 2, characterized in that, The spoilers (7) are spaced out in the circumferential direction; the angle between the spoilers (7) and the airflow direction gradually decreases along the airflow direction.

4. The nozzle assembly according to claim 3, characterized in that, Along the gas flow direction, the airflow channel (4) is divided into an inlet area (12), a middle area (13) and an outlet area (14). The inlet area (12), the middle area (13) and the outlet area (14) are all provided with a few interference vanes (7).

5. The nozzle assembly according to claim 4, characterized in that, In the intake area (12), the flat side (11) of the spoiler (7) forms an angle of 30°-40° with the airflow direction; in the middle area (13), the flat side (11) of the spoiler (7) forms an angle of 15°-25° with the airflow direction; in the exhaust area (14), the flat side (11) of the spoiler (7) forms an angle of 5°-10° with the airflow direction.

6. The nozzle assembly according to claim 1, characterized in that, The spoiler (7) has several layers, and the spoilers (7) in adjacent layers are arranged alternately.

7. The nozzle assembly according to claim 1, characterized in that, Along the airflow direction, the arrangement density of the baffles (7) gradually increases.

8. The nozzle assembly according to claim 1, characterized in that, The inlet of the airflow channel (4) is larger than its outlet. The yarn outlet of the nozzle core (2) is located inside the airflow channel (4) and the yarn outlet of the nozzle core (2) is close to the outlet of the airflow channel (4).

9. A jet loom, characterized in that, The nozzle assembly as described in any one of claims 1-8 is used.

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