An auxiliary nozzle group for air-jet looms with enhanced air flow

Abstract

The utility model discloses a kind of air-jet loom auxiliary nozzle groups of enhanced airflow, it is related to the technical field of auxiliary nozzle of air-jet loom.The utility model includes outer thread pipe, the outer thread pipe top is fixedly connected with air jet seat, the air jet seat top is fixedly connected with mounting seat, the mounting seat top is fixedly connected with connecting pipe, the first shrinkage cavity is arranged in the mounting seat inner chamber, the connecting pipe is fixedly connected with shrinkage tube with the end away from the mounting seat.The utility model is compressed air by outside through the first shrinkage cavity of mounting seat, completes first acceleration, then, through the second shrinkage cavity of shrinkage tube, realize the second acceleration of airflow, then, through transition pipe, complete third acceleration, finally, airflow is sprayed through the side of flat tube gradually shrinkage type small circle air outlet, because small circle air outlet length is less than the wall thickness of flat tube and aperture is reduced from inside to outside in flat tube, realize fourth acceleration, by compressed air four times acceleration, form high-speed airflow beam to drag weft yarn.

Description

Technical Field

[0001] This utility model belongs to the field of auxiliary nozzle technology for air-jet looms, and more specifically, it relates to an auxiliary nozzle assembly for air-jet looms that enhances airflow. Background Technology

[0002] In the operation of an air-jet loom, the auxiliary nozzle assembly plays a crucial role. It assists the weft yarn through the shed by jetting airflow, ensuring the smooth progress of the weft insertion process. From the working principle of the auxiliary nozzle, it sprays air before the weft yarn arrives, driving the air in front of the weft yarn to move, reducing the air resistance to the weft yarn, creating a relative negative pressure at the front end of the weft yarn, which has an attraction effect on the weft yarn. At the same time, it supplements the energy of the main air jet, keeping the weft insertion airflow at a certain speed, and sending the weft yarn through the shed in a relay manner.

[0003] Common auxiliary nozzle structures generally consist of an auxiliary nozzle circular tube, a transition tube, a flat tube, and a nozzle unit. The intermediate transition section uses a tapered pipe to accelerate the airflow in the first stage, and the outlet achieves the second stage of acceleration. However, the acceleration effect of this structure is limited. In actual production, if the outlet air velocity of the auxiliary nozzle is not high, the only way to achieve the purpose of increasing the speed is to increase the supply air pressure, but this will sacrifice energy consumption and greatly increase production costs.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes an auxiliary nozzle assembly for a jet loom that enhances airflow, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model is an auxiliary nozzle assembly for an air-jet loom that enhances airflow, including an externally threaded tube, an air jet seat fixedly connected to the top of the externally threaded tube, an installation seat fixedly connected to the top of the air jet seat, a connecting tube fixedly connected to the top of the installation seat, and a first contraction cavity opened in the inner cavity of the installation seat;

[0008] A shrink tube is fixedly connected to the end of the connecting tube away from the mounting base, and a round tube is fixedly connected to the end of the shrink tube away from the connecting tube. A second shrink cavity is opened in the inner cavity of the shrink tube.

[0009] The end of the round tube away from the contraction tube is fixedly connected to a transition tube, and the end of the transition tube away from the round tube is fixedly connected to a flat tube. A small round air outlet is opened on the side of the flat tube away from the transition tube.

[0010] A gas supply chamber is provided inside the flat tube and around the small round air outlet.

[0011] Furthermore, the diameter of the first contraction chamber gradually decreases from the jet seat toward the connecting pipe.

[0012] Furthermore, the diameter of the second contraction cavity gradually decreases from the connecting pipe toward the circular pipe.

[0013] Furthermore, the diameter of the small circular air outlet gradually decreases from the inner cavity of the flat tube outwards, and the length of the small circular air outlet is less than the wall thickness of the flat tube.

[0014] Furthermore, the gas supply cavity includes a large circular air outlet, which is located around the small circular air outlet, and the large circular air outlet and the small circular air outlet face the same direction.

[0015] Furthermore, the gas supply chamber also includes an air inlet chamber, which is connected to the large circular air outlet, and an air inlet is connected to the air inlet chamber.

[0016] Furthermore, the air inlet is provided with an air intake flat plate, and the thickness of the air intake flat plate gradually decreases on the side close to the air intake cavity.

[0017] This utility model has the following beneficial effects:

[0018] This invention utilizes external compressed air passing through the first contraction chamber of the mounting base. The first contraction chamber employs a steeper tapering ratio, enabling the airflow to undergo initial acceleration. Next, it passes through the second contraction chamber of the contraction tube, which uses a gentler tapering ratio to achieve a second acceleration. Subsequently, it passes through a transition tube, where the channel changes from a circular cross-section to a flat cross-section, completing a third acceleration. Finally, the airflow is ejected through a small, tapering circular outlet on the side of the flat tube. Because the length of the small circular outlet is less than the wall thickness of the flat tube and the diameter decreases from the inside to the outside of the flat tube, a fourth acceleration is achieved. Through these four accelerations by compressed air, a high-speed airflow bundle is formed to pull the weft yarn.

[0019] When the small circular air outlet ejects high-speed airflow, its outlet end face retracts inward to the outer large circular air outlet. This causes the airflow to first act on the large circular air outlet to form an annular pressure field, while the center of the small circular air outlet forms a low-pressure zone due to the high-speed airflow. Air enters through the air inlet and, guided by the gradually narrowing air inlet flat plate, enters the air inlet chamber. It then converges towards the low-pressure zone through the large circular air outlet, intersecting with the high-speed airflow ejected from the small circular air outlet to form a coaxial airflow. This further enhances the traction capability of the weft yarn and ensures stable flight of the weft yarn.

[0020] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the utility model embodiments, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the 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 three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the back of the present invention;

[0024] Figure 3 This is a first partial sectional view of the present invention;

[0025] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 for Figure 3 Enlarged view at point B in the middle;

[0027] Figure 6 This is a second partial sectional view of the present invention.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. External threaded tube; 2. Jet seat; 3. Mounting seat; 301. First contraction chamber; 4. Connecting tube; 5. Contraction tube; 501. Second contraction chamber; 6. Round tube; 7. Transition tube; 8. Flat tube; 9. Small round air outlet; 10. Gas supply chamber; 1001. Large round air outlet; 1002. Air inlet chamber; 1003. Air inlet; 1004. Air inlet flat plate. Detailed Implementation

[0030] The technical solutions of the utility model embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the utility model.

[0031] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0032] Please see Figures 1-6 As shown, this utility model is an auxiliary nozzle assembly for an air-jet loom that enhances airflow, including an externally threaded tube 1, an air jet seat 2 fixedly connected to the top of the externally threaded tube 1, an mounting seat 3 fixedly connected to the top of the air jet seat 2, a connecting tube 4 fixedly connected to the top of the mounting seat 3, and a first contraction chamber 301 opened in the inner cavity of the mounting seat 3.

[0033] The external threaded pipe 1 is connected to the external compressed gas. The external compressed air enters through the air inlet end of the external threaded pipe 1, and then enters the jet seat 2. It then flows along the jet seat 2 through the first contraction chamber 301 inside the mounting base 3. The first contraction chamber 301 adopts a tapered design and a steeper tapering ratio, which increases the speed of the airflow when it passes through, completing the initial acceleration. The gas after the initial acceleration then enters the connecting pipe 4. The main function of the connecting pipe 4 is to smoothly transport the airflow that has undergone one acceleration.

[0034] The end of the connecting pipe 4 away from the mounting base 3 is fixedly connected to a shrink tube 5, and the end of the shrink tube 5 away from the connecting pipe 4 is fixedly connected to a round tube 6. The inner cavity of the shrink tube 5 is provided with a second shrink cavity 501.

[0035] The airflow enters the contraction tube 5 from the connecting tube 4 and passes through the second contraction chamber 501 inside it. The second contraction chamber 501 adopts a gentle contraction ratio, which further increases the airflow speed and accelerates the gas a second time. The airflow enters the circular tube 6 from the end of the contraction tube 5.

[0036] The end of the round tube 6 away from the contraction tube 5 is fixedly connected to a transition tube 7, and the end of the transition tube 7 away from the round tube 6 is fixedly connected to a flat tube 8. A small round air outlet 9 is opened on the side of the flat tube 8 away from the transition tube 7.

[0037] High-speed airflow enters transition tube 7 from circular tube 6, achieving a smooth transition in the shape of the airflow channel (from circular cross-section to flat cross-section), maintaining the stability of the airflow velocity. The cross-sectional shape of the channel becomes flat, causing the airflow to diffuse along the width direction and be compressed in the height direction, producing the Venturi effect. The airflow velocity is accelerated for the third time due to the change in cross-section. The high-speed airflow is ejected through the small circular air outlet 9 on the side of the flat tube 8, achieving the fourth acceleration, and then forming a high-speed airflow bundle. The high-speed airflow forms a relay-type traction weft yarn.

[0038] A gas supply chamber 10 is provided inside the flat tube 8 and around the small round air outlet 9;

[0039] When gas is ejected at high speed from the small circular air outlet 9, according to Bernoulli's principle, the pressure in the high-speed flow region will decrease significantly. Since the airflow velocity at the small circular air outlet 9 is much higher than the airflow velocity in the gas supply cavity 10 around it, a low-pressure zone is formed in the center of the small circular air outlet 9, while the gas in the gas supply cavity 10 is in a relatively high-pressure state. This pressure difference will push the gas in the gas supply cavity 10 to converge towards the periphery of the small circular air outlet 9. The converged gas interacts with the high-speed airflow ejected from the small circular air outlet 9 to form a coaxial airflow, thereby improving the traction ability of the weft yarn.

[0040] In one embodiment, for the first contraction chamber 301, the diameter of the first contraction chamber 301 gradually decreases from the jet seat 2 toward the connecting pipe 4.

[0041] The first contraction chamber 301 adopts a gradually narrowing design, which enables the airflow to complete the initial acceleration of speed when passing through it.

[0042] In one embodiment, for the second contraction cavity 501, the diameter of the second contraction cavity 501 gradually decreases from the connecting pipe 4 toward the circular pipe 6.

[0043] The second contraction chamber 501 adopts a gentle contraction ratio, which further increases the airflow speed, enabling the airflow to complete a second acceleration of speed when passing through.

[0044] In one embodiment, for the small circular air outlet 9, the diameter of the small circular air outlet 9 gradually decreases from the inner cavity of the flat tube 8 outwards, and the length of the small circular air outlet 9 is less than the wall thickness of the flat tube 8.

[0045] The diameter of the small round air outlet 9 gradually decreases from the inner cavity of the flat tube 8 outwards. When the high-speed airflow enters the small round air outlet 9 from the inner cavity of the flat tube 8, the gas is accelerated for the fourth time.

[0046] In one embodiment, the gas supply cavity 10 includes a large circular vent 1001, which is located around the small circular vent 9, and the large circular vent 1001 and the small circular vent 9 have the same orientation.

[0047] The gas supply chamber 10 further includes an air inlet chamber 1002, which is connected to the large circular air outlet 1001, and an air inlet 1003 is connected to the air inlet chamber 1002.

[0048] The air inlet 1003 is provided with an air intake flat plate 1004, and the thickness of the air intake flat plate 1004 gradually decreases on the side near the air intake cavity 1002.

[0049] When the high-speed airflow is ejected from the small circular outlet 9, because the length of the small circular outlet 9 is less than the wall thickness of the flat tube 8, the outermost end of the large circular outlet 1001 extends to the side of the flat tube 8. This creates a structure where the outlet end face of the small circular outlet 9 is recessed within the outlet end face of the large circular outlet 1001. As a result, after leaving the small circular outlet 9, the high-speed airflow first acts on the annular outlet region of the large circular outlet 1001, forming an annular pressure field. This pressure field prevents the direct entrainment of ambient air around the flat tube 8, ensuring that the peripheral airflow replenishment comes primarily from the gas supply cavity. 10. To prevent interference with the weft yarn, the airflow velocity in the central area of ​​the small circular air outlet 9 is much higher than the airflow velocity in the large circular air outlet 1001. According to Bernoulli's principle, this area forms a significant low-pressure zone. Air enters through the air inlet 1003 and, under the guidance and acceleration of the tapered air inlet flat plate 1004, smoothly enters the air inlet chamber 1002. Then, it converges towards the low-pressure zone through the large circular air outlet 1001, forming a coaxial jet structure with high-speed airflow as the center and annular auxiliary airflow as the periphery, thereby improving the traction ability of the weft yarn.

[0050] Working principle: External compressed air enters through the inlet end of the external threaded pipe 1 and flows sequentially through the jet seat 2 and the first contraction chamber 301 of the mounting seat 3. The first contraction chamber 301 adopts a steeper tapering ratio, which accelerates the airflow initially. Then, it is smoothly delivered to the second contraction chamber 501 of the contraction pipe 5 through the connecting pipe 4. The second contraction chamber 501 achieves a second acceleration of the airflow with a gentle tapering ratio. Subsequently, the accelerated airflow passes through the circular pipe 6 and enters the transition pipe 7. The channel changes from a circular cross section to a flat cross section, generating the Venturi effect and completing the third acceleration. Finally, the airflow is ejected through the tapering small circular air outlet 9 on the side of the flat pipe 8. Because the length of the small circular air outlet 9 is less than the wall thickness of the flat pipe 8 and the diameter decreases from the inside to the outside of the flat pipe 8, the fourth acceleration is achieved, forming a high-speed airflow bundle that pulls the weft yarn.

[0051] When the small circular air outlet 9 ejects high-speed airflow, its outlet end face retracts inward to the outer large circular air outlet 1001, causing the airflow to first act on the large circular air outlet 1001 to form an annular air pressure field. The center of the small circular air outlet 9 forms a low-pressure zone due to the high-speed airflow. Air enters through the air inlet 1003 and, guided by the gradually narrowing air inlet flat plate 1004, enters the air inlet chamber 1002. It then converges towards the low-pressure zone through the large circular air outlet 1001 and intersects with the high-speed airflow ejected from the small circular air outlet 9 to form a coaxial airflow, further enhancing the traction capability of the weft yarn and ensuring stable flight of the weft yarn.

[0052] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] The preferred embodiments of the utility model disclosed above are merely illustrative of the utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the utility model, thereby enabling those skilled in the art to better understand and utilize it. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An auxiliary nozzle assembly for an air-jet loom that enhances airflow, comprising an externally threaded tube (1), wherein an air jet seat (2) is fixedly connected to the top of the externally threaded tube (1), and a mounting base (3) is fixedly connected to the top of the air jet seat (2), characterized in that: The top of the mounting base (3) is fixedly connected to a connecting pipe (4), and the inner cavity of the mounting base (3) is provided with a first contraction cavity (301). The connecting pipe (4) is fixedly connected to a shrink tube (5) at one end away from the mounting base (3), and a round tube (6) is fixedly connected to the other end of the shrink tube (5) away from the connecting pipe (4). A second shrink cavity (501) is opened in the inner cavity of the shrink tube (5). The end of the round tube (6) away from the contraction tube (5) is fixedly connected to a transition tube (7), and the end of the transition tube (7) away from the round tube (6) is fixedly connected to a flat tube (8). A small round air outlet (9) is opened on the side of the flat tube (8) away from the transition tube (7). A gas supply chamber (10) is provided inside the flat tube (8) and around the small round air outlet (9).

2. The auxiliary nozzle assembly for an air-jet loom according to claim 1, characterized in that, The diameter of the first contraction chamber (301) gradually decreases from the jet seat (2) toward the connecting pipe (4).

3. The auxiliary nozzle assembly for an air-jet loom to enhance airflow according to claim 1, characterized in that, The diameter of the second contraction cavity (501) gradually decreases from the connecting pipe (4) toward the circular pipe (6).

4. The auxiliary nozzle assembly for an airflow-enhancing jet loom according to claim 1, characterized in that, The diameter of the small round air outlet (9) gradually decreases from the inner cavity of the flat tube (8) outwards, and the length of the small round air outlet (9) is less than the wall thickness of the flat tube (8).

5. An auxiliary nozzle assembly for an air-jet loom to enhance airflow according to claim 1, characterized in that, The gas supply cavity (10) includes a large circular air outlet (1001), which is located around the small circular air outlet (9), and the large circular air outlet (1001) and the small circular air outlet (9) have the same orientation.

6. An auxiliary nozzle assembly for an air-jet loom to enhance airflow according to claim 5, characterized in that, The gas supply chamber (10) further includes an air inlet chamber (1002), which is connected to the large circular air outlet (1001), and an air inlet (1003) is connected to the air inlet chamber (1002).

7. An auxiliary nozzle assembly for an air-jet loom to enhance airflow according to claim 6, characterized in that, The air inlet (1003) is provided with an air intake flat plate (1004), and the thickness of the air intake flat plate (1004) gradually decreases on the side near the air intake cavity (1002).

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