A kind of can accelerate air jet loom main nozzle

Abstract

The application discloses an accelerated main nozzle of a jet loom, which comprises a nozzle core, a nozzle base, a nozzle sleeve, a yarn feeding pipe and an air inlet pipe. The nozzle core is provided with a weft guiding channel, the nozzle base is provided with a gas guiding hole, the nozzle base is connected with the nozzle sleeve, the yarn feeding pipe is connected with the front end of the nozzle sleeve, the air inlet pipe is connected with the upper end of the nozzle base, the nozzle base is connected with the nozzle core and the nozzle sleeve, and the air inlet of the air inlet pipe is connected with the airflow channel. The gas in the airflow channel, the gas in the weft guiding channel and the weft yarn meet in the airflow mixing area and enter the yarn feeding pipe. The airflow channel between the nozzle core and the nozzle sleeve is in the structure of a Laval nozzle. The airflow is accelerated in the Laval airflow channel. The nested combination of the nozzle group can realize multiple airflow acceleration. The effective speed of the airflow meeting area of the main nozzle and the yarn feeding pipe is obviously improved, so that the weft guiding performance of the main nozzle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of accelerated air jet loom main nozzle, belong to textile air jet loom technical field. BACKGROUND

[0002] Air jet loom has the advantages such as width, high efficiency, high production efficiency, the basic principle of air jet loom is that the friction force of high-speed airflow of nozzle to weft yarn generates in reed groove to quickly pull over the layer of warp shed to reach the purpose of weft insertion.The realization of air jet loom weft insertion action is the result of main nozzle, auxiliary nozzle, special-shaped reed groove and extension nozzle mutual action.Main nozzle is the key component of airflow weft insertion, the airflow injection performance of main nozzle directly influences the efficiency of air jet loom and the quality of fabric.With the development of aerodynamics and the needs of social production, the characteristics of nozzle airflow field of weft insertion system have been highly valued, the research on the structure of main nozzle and auxiliary nozzle and its airflow field has become a hot direction.

[0003] The structure of main nozzle and its airflow passage are important factors influencing the performance of air jet loom, the weft insertion flow field of main nozzle directly influences the nature of the combined flow field of auxiliary nozzle, and plays a crucial role in the running of weft yarn.The existing traditional main nozzle structure is improved, the weft insertion flow field of main nozzle is optimized to improve the acceleration characteristics of air jet loom main nozzle, improve the production efficiency of loom and the quality of fabric. SUMMARY

[0004] In view of the problems existing in the prior art, the present application provides an accelerated air jet loom main nozzle, so as to improve the bunching of jet flow at the outlet of yarn feeding pipe and increase the effective speed, thereby improving the weft insertion performance of air jet loom main nozzle.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: an accelerated air jet loom main nozzle, comprising a nozzle core, a nozzle base, a nozzle sleeve, a yarn feeding pipe and an air inlet pipe; the nozzle core is arranged inside the nozzle base, the nozzle core is provided with a weft insertion passage, and a gas guide hole is formed in the nozzle base; the nozzle base and the nozzle sleeve are connected in sequence, the yarn feeding pipe is connected with the front end of the nozzle sleeve, the air inlet pipe is connected with the upper end of the nozzle base, and there is an airflow passage between the nozzle base, the nozzle core and the nozzle sleeve, which is connected with the air inlet of the air inlet pipe; the gas in the airflow passage, the gas in the weft insertion passage and the weft yarn meet in the airflow mixing area and flow into the yarn slot in the yarn feeding pipe.

[0006] Further, the airflow passage between the nozzle core and the nozzle sleeve is a Laval airflow passage area, which is an axisymmetric structure, and the Laval airflow passage area includes a airflow stabilizing area, a airflow contraction area, a airflow throat and an airflow expansion area.

[0007] Further, the air inlet of the air inlet pipe, the nozzle base and the air guide groove of the nozzle core are communicated in sequence, and the front end of the air guide groove is provided with an air flow through hole communicated with the Laval air flow passage area.

[0008] Further, the air flow stabilizing area is surrounded by the inner inclined surface of the nozzle sleeve and the outer inclined surface of the nozzle core, the air passage contraction area and the air passage expansion area are surrounded by the inner circular arc surface of the nozzle sleeve and the outer circular arc surface of the front end of the nozzle core, and the air flow throat is located at the narrowest position between the air passage contraction area and the air passage expansion area.

[0009] Further, the nozzle core is provided with a weft insertion hole in the center, including a weft insertion expansion section and a weft insertion slender section, the right end of the nozzle core is in the shape of a sharp head, the side surface of the sharp head end is in the shape of a circular arc, the weft insertion expansion section is in the shape of a tapered pipe, and the weft insertion slender section is in the shape of a parallel cylindrical pipe structure.

[0010] Further, the weft insertion slender section is embedded with a circular pipe structure, and the right end of the circular pipe extends out of the sharp head end of the nozzle core by a distance as a flow stabilizing member.

[0011] Further, the nozzle core, the nozzle base and the nozzle sleeve form a nozzle group, and one or more nozzle groups can be arranged for the main nozzle.

[0012] Further, the longitudinal section of the wire feeding pipe can be a parallel channel, a tapered channel or a Laval structure channel.

[0013] The beneficial effects of the present application are as follows: the air flow section between the nozzle core and the nozzle sleeve in the air flow passage of the main nozzle is in the Laval acceleration structure, the right end of the nozzle core is arranged in the shape of an arrow head, the air flow velocity of the air flow out of the air flow passage can be greatly improved at the weft insertion slender outlet, and even the air flow velocity can reach supersonic speed, the weft insertion slender section is embedded with a circular pipe structure, the right end of the circular pipe extends out of the sharp head end of the nozzle core by a distance as a flow stabilizing member, the weft disturbance caused by unstable air flow can be limitedly reduced, the contraction type or Laval type flow channel in the wire feeding pipe can make the air flow speed up in the wire outlet slot, the series connection of multiple main nozzle structures can also improve the bunching of the air flow jet at the outlet of the wire feeding pipe and increase the effective speed, thereby improving the weft insertion performance of the air jet loom main nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the Laval nozzle structure;

[0015] Figure 2 It is a schematic diagram of the main nozzle structure of the present application;

[0016] Figure 3 It is a schematic diagram of the longitudinal section of the main nozzle structure of the present application;

[0017] Figure 4The schematic diagram of the airflow direction of the main nozzle structure of the accelerated air-jet loom of the present application;

[0018] Figure 5 The schematic diagram of the main nozzle provided with the flow stabilizer of the present application;

[0019] Figure 6 The schematic diagram of the present application provided with two main nozzle structures.

[0020] In the figure: 1, nozzle core, 2, nozzle base, 3, nozzle sleeve, 4, yarn feeding tube, 5, air inlet tube, 6, flow stabilizer, 10, weft insertion channel, 11, weft insertion expansion section, 12, weft insertion slender section, 100, first nozzle group, 200, second nozzle group, 103a, outer inclined surface, 104a, outer circular arc surface, 21, weft insertion expansion section of the second nozzle group, 22, weft insertion slender section of the second nozzle group, 303b, inner inclined surface, 304b, inner circular arc surface, 41, yarn outlet slot, 50, airflow channel, 51, air inlet, 500, air guide hole, 501, air guide slot, 502, airflow through hole, 503, airflow stabilizing area, 504, air channel contraction area, 505, air channel throat, 506, air channel expansion area, 507, airflow convergence area. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application is further described in detail below by means of the drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the present application and are not intended to limit the scope of the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0023] As Figures 2-3 shown, the present application implements a kind of accelerated air-jet loom main nozzle, including nozzle core 1, nozzle base 2, nozzle sleeve 3, yarn feeding tube 4, air inlet tube 5;Nozzle core 1 is arranged in the inside of nozzle base 2, nozzle core 1 is provided with weft insertion channel 10, nozzle base 2 is provided with air guide hole 500, nozzle base 2 and nozzle sleeve 3 are sequentially connected, yarn feeding tube 4 is connected with the front end of nozzle sleeve 3, air inlet tube 5 is connected with the upper end of nozzle base 2, nozzle base 2 and nozzle core 1 and nozzle sleeve between with the air inlet 51 of air inlet tube 5 are connected with airflow channel 50;The gas in airflow channel 50 and the gas of weft insertion channel and weft yarn meet in airflow mixing area 507 and flow into yarn outlet slot 41 in yarn feeding tube 4.

[0024] As Figures 1-2As shown, the airflow passage between the nozzle core 1 and the nozzle sleeve 3 is a Laval airflow passage area, which is an axisymmetric structure, and the Laval airflow passage area includes an airflow stabilizing area 503, an airflow contraction area 504, an airflow throat 505, and an airflow expansion area 506.

[0025] The air inlet 51 of the air inlet pipe 5, the air guide hole 500 of the nozzle base 2, and the air guide groove 501 of the nozzle core 1 are sequentially communicated, the airflow through hole 503 is opened on the front wing of the nozzle core, and the left and right sides of the airflow through hole 503 are respectively communicated with the air guide groove 501 and the Laval airflow passage.

[0026] The airflow stabilizing area 503 is surrounded by the inner inclined surface 503a of the nozzle sleeve 3 and the outer inclined surface 103a of the nozzle core, the airflow contraction area 504 and the airflow expansion area 506 are surrounded by the inner arc surface 304a of the nozzle sleeve 3 and the outer arc surface 104a of the front end of the nozzle core 1, and the airflow throat 505 is the narrowest throat area between the airflow contraction area 504 and the airflow expansion area 506.

[0027] As shown, Figure 4 the high-pressure airflow flows from the air inlet 51 into the air guide groove 501 through the air guide hole 500, and then enters the airflow stabilizing area 503 through the airflow through hole 502. The airflow stabilizing area 503 can make the upstream airflow tend to be uniform and reduce turbulence, so that the stable airflow enters the airflow contraction area 504. The arc surfaces 304a and 104a contract quickly at the inlet, and then transition to the throat at a relatively slow contraction speed. The transition area is relatively uniform and smooth, which ensures the uniformity, straightness and stability of the airflow. The airflow gradually accelerates in this area, and the speed approaches the sound speed when the airflow reaches the airflow throat 505. Then the airflow enters the airflow expansion area 506, and the airflow speed increases again, forming the first acceleration of the airflow. The airflow is ejected at a high speed, intersects with the airflow and weft yarn flowing out of the weft insertion channel 10 at the airflow convergence area 507, and drags the weft yarn forward along the outlet direction of the yarn guide pipe 4 in a high-speed state.

[0028] The nozzle core 1 has a weft insertion channel in the center, including a weft insertion expansion section 11 and a weft insertion slender section 12. The right end of the nozzle core 1 is in the shape of a sharp tip, the side surface of the sharp tip end is in the shape of an arc, the weft insertion expansion section 11 is in the shape of a tapered pipe, and the weft insertion slender section 12 is in the shape of a parallel cylindrical pipe,

[0029] As shown, Figure 5 the weft insertion slender section 12 is nested with a circular pipe structure, and the right end of the circular pipe extends a distance as a flow stabilizing member 6, so that the airflow is relatively stable near the airflow convergence area 507 and the turbulence disturbance phenomenon is reduced.

[0030] Further, the nozzle core 1, the nozzle base 2, and the nozzle sleeve 3 form a nozzle group, and one or more nozzle groups can be provided for the main nozzle. There is no limit to the number of nozzle groups, and the number of nozzle groups can be set according to actual production needs.

[0031] As Figure 6 shown, a schematic diagram of a main nozzle structure with two nozzle groups is an embodiment, the main nozzle structure is provided with two nozzle groups, the first nozzle group 100 structure is the same as the main nozzle structure of a single nozzle, the second nozzle group 200 is arranged at the right end of the first nozzle group, the nozzle core and nozzle base of the second nozzle group 200 are arranged close to the right end of the nozzle sleeve of the first nozzle group 100, and are connected with each other in size, so that the airflow of the airflow convergence area 507 of the first nozzle group 100 flows smoothly into the weft guiding expansion section 21 of the second nozzle group 200, the airflow is accelerated through the contraction section structure, a second airflow acceleration is formed, the converged and accelerated airflow flows at high speed through the weft guiding slender section 22 of the second nozzle group 200, flows out of the weft guiding hole of the second nozzle group 200 at high speed, converges with the high-speed airflow of the airflow channel of the second nozzle group 200, a third airflow acceleration is formed, and then the high-speed airflow drags the weft yarn to move along the outlet direction of the weft yarn guide tube 4.

[0032] The longitudinal section of the weft yarn outlet slot 41 of the weft yarn guide tube 4 is provided as a parallel channel, and can also be provided as a tapered channel or a Laval structure channel. If the weft yarn outlet slot 41 is provided as a tapered channel or a Laval structure channel, the accelerated airflow can be accelerated again.

[0033] Therefore, the main nozzle of a single nozzle group can realize twice airflow acceleration, and the main nozzle provided with two nozzle groups can form a fourth airflow acceleration. The effective speed of the airflow convergence area of the main nozzle and the area inside the weft yarn guide tube is obviously accelerated, and the weft guiding performance of the main nozzle is improved.

[0034] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A main nozzle for accelerating an air-jet loom, characterized in that, The device includes a nozzle core (1), a nozzle base (2), a nozzle sleeve (3), a yarn feeding tube (4), and an air inlet pipe (5). The nozzle core (1) is located inside the nozzle base (2) and has a weft insertion channel (10). The nozzle base (2) has an air guide hole (500). The nozzle base (2) and the nozzle sleeve (3) are connected in sequence. The yarn feeding tube (4) is connected to the front end of the nozzle sleeve (3). The air inlet pipe (5) is connected to the upper end of the nozzle base (2). There is an airflow channel (50) between the nozzle base (2), the nozzle core (1), and the nozzle sleeve, which is connected to the air inlet (51) of the air inlet pipe (5). The gas in the airflow channel (50) and the gas and weft yarn in the weft insertion channel meet in the airflow mixing zone (507) and flow into the yarn feeding tube (41) and outflow groove (41). The airflow channel between the nozzle core (1) and the nozzle sleeve (3) is the Laval airflow channel region, which is an axisymmetric structure. The Laval airflow channel region includes an airflow stabilization zone (503), an airway contraction zone (504), an airflow throat (505), and an airway expansion zone (506). The air inlet (51) of the air inlet pipe (5), the air inlet of the nozzle base (2) and the air guide groove (501) of the nozzle core (1) are connected in sequence. The front end of the air guide groove (501) has an air flow hole that is connected to the Laval air flow channel area. The airflow stabilization zone (503) is formed by the inner inclined surface (503a) of the nozzle sleeve (3) and the outer inclined surface (103a) of the nozzle core. The airway contraction zone (504) and the airway expansion zone (506) are formed by the inner arc surface (304a) of the nozzle sleeve (3) and the outer arc surface (104a) of the front end of the nozzle core (1). The airflow throat (505) is located at the narrowest position between the airway contraction zone (504) and the airway expansion zone (506). The nozzle core (1) has a weft insertion hole in the center, including a weft insertion expansion section (11) and a weft insertion slender section (12). The right end of the nozzle core (1) is pointed, and the side of the pointed end is arc-shaped. The weft insertion expansion section (11) is a conical tube, and the weft insertion slender section (12) is a parallel cylindrical tube structure. The slender weft section (12) is nested with a circular tube structure, and the right end of the circular tube extends a distance from the tip of the nozzle core (1) as a flow stabilizer (6). The nozzle core (1), nozzle base (2), and nozzle sleeve (3) constitute a nozzle group, and the main nozzle is provided with one or more nozzle groups; The longitudinal section of the wire feeding tube (4) is a parallel channel, a tapered channel, or a Laval structure channel.

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