JP2003049342A - Picking nozzle for fluid jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picking nozzle enabling high-speed picking by enhancing jet fluid directivity and thus preventing the jet fluid from scattering and weft convergence from getting poor. SOLUTION: This picking nozzle comprises an inner side component having an open hole through which a weft passes and an outer side component inserted with the inner side component and coaxially having with the outer circumferential surface of the inner side component an inner circumferential surface forming together with the outer circumferential surface of the inner side component a circular 1st flow path and a 2nd flow path adjoining the downstream side of the 1st flow path and decreasing in cross-section area toward the downstream side; wherein the downstream end of the 2nd flow path is provided with a jet port through which a high-pressure fluid is jetted, and the inner side and/or outer side of the section corresponding to at least the position of the jet port of the 2nd flow path is of noncircular shape with unit shapes disposed at equiangular intervals around the axis of both the circumferential surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion nozzle used in a fluid jet loom such as a water jet loom.

[0002]

2. Description of the Related Art As one of the weft insertion nozzles of this type, a needle having a through hole through which a weft thread penetrates is coaxially inserted into a nozzle body to form an annular flow path, which extends in the axial direction of the nozzle. A commutator equipped with a plurality of flow straightening walls at equal angular intervals around the axis is arranged on the tip (downstream) side of the annular flow path with a space around the tip of the needle, and a high pressure fluid There is a nozzle body in which a plurality of introduction holes leading to a flow path are formed (Japanese Patent No. 3120042).

In this prior art, the high-pressure fluid is introduced from the nozzle holder connected to the high-pressure fluid source into the annular flow passage through the introduction hole, and through the space between the needle and the commutator in the annular flow passage, the high-pressure fluid is ejected from the injection port. It is jetted toward the warp shed. The commutator has a plurality of rectifying walls on the upstream side thereof, rectifying grooves are formed between adjacent rectifying walls, and has an inner peripheral surface with a circular cross section on the downstream side. An injection port is formed at the downstream end with the outer peripheral surface.

Both the inner peripheral surface on the downstream side of the commutator and the outer peripheral surface of the needle are gradually reduced in diameter toward the downstream side and the flow passage cross-sectional area is gradually reduced, whereby the high pressure fluid is throttled and accelerated. When it reaches the injection port, it is released from the throttle and released from the pressurized state to become an injection fluid. The high-pressure fluid is also rectified by being divided into a plurality of flows by the rectifying wall so as to prevent the flows from colliding with each other.

[0005]

However, in the conventional weft insertion nozzle, since the shape of the inner peripheral surface and the outer peripheral surface forming the fluid ejection port is circular, the high-pressure fluid is ejected in an annular shape at a uniform speed. As a result, the jetted fluid from the jetting port is easily diffused, the warp is damaged, and the flight speed of the weft is reduced, so that the loom cannot be operated at high speed.

An object of the present invention is to improve the directionality of the jet fluid, prevent the jet fluid from scattering and deteriorating the convergence, and enable high-speed weft insertion.

[0007]

SOLUTION, ACTION, EFFECT The weft insertion nozzle according to the present invention is
An inner member having a through hole through which the weft passes, an outer member into which the inner member is inserted, and an annular first flow path, which continues to the downstream side of the first flow path and has a downstream flow path cross-sectional area. And an outer member that has an inner peripheral surface that is formed in cooperation with the outer peripheral surface of the inner member and that has a second flow channel that decreases toward the side, and that is coaxial with the outer peripheral surface. The second flow path has a jet port at the downstream end for jetting a high-pressure fluid. At least one of the inner side and the outer side of the cross section corresponding to at least the position of the injection port of the second flow path is formed in a non-circular shape in which a plurality of unit shapes are arranged at equal angular intervals around the axes of both circumferential surfaces. Has been done.

The high-pressure fluid introduced into the annular first flow passage is throttled and accelerated in the second flow passage whose flow passage cross-sectional area decreases toward the downstream side, and is throttled by the second flow passage at the injection port. Is released from the pressurized state, and is ejected as an ejection fluid from the ejection port.

An injection port having a non-circular shape in which a plurality of unit shapes are arranged at equal angular intervals around the axes of both circumferential surfaces has a plurality of spaces of the same shape at equal angular intervals in the circumferential direction. Since the flow path resistance of the high-pressure fluid is small in the portion where the space is large, the ejection fluid is ejected at high speed from that portion.

Therefore, the jet fluid is jetted in a state in which a plurality of high-speed portions are arranged at equal intervals in the circumferential direction, and such high-speed portions form an annular bundle. Therefore, the directionality of the ejected fluid is higher than that of the high-pressure fluid which is annularly ejected at a uniform velocity as in the conventional technique, and the convergent property of the ejected fluid is improved.

Therefore, according to the present invention, damage to the warp due to the diffusion of the jetted fluid can be suppressed, and high-speed weft insertion is possible.

At least one of the inner member and the outer member may have a plurality of straightening walls, which are formed at equal angular intervals with respect to the axes of the peripheral surfaces, upstream of the injection port. When the high-pressure fluid is squeezed and accelerated, the high-speed fluid flows collide with each other and become a turbulent state.However, when there is a flow straightening wall, the high-speed fluid flow is suppressed by the flow straightening wall and is in a turbulent state. Is suppressed, and as a result, the convergence of the jet fluid is further improved.

In a preferred embodiment, the outer member is the nozzle body in which the inner member is coaxially inserted, and the annular member arranged in the nozzle body, and the second flow path is provided. And an annular member co-forming with the inner member.

In another preferred embodiment, the flow straightening wall reaches at least the injection port.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, a weft insertion nozzle 10 has a needle 12 that acts as an inner member.
And a cylindrical nozzle body 14 that coaxially receives the needle 12, and a commutator 16 that acts as an annular member that is coaxially arranged in the nozzle body 14. The weft insertion nozzle 10 is assembled to the nozzle joint in the nozzle body 14.

The needle 12 coaxially has a through hole 22 through which the weft thread 20 passes, and is fixed to the nozzle body 14 by a fastener 24 screwed to the nozzle body 14 from the side opposite to the ejection side of the fluid. There is. The diameter of the outer peripheral surface of the tip of the needle 12 is gradually reduced toward the tip, and the upstream side cooperates with the inner peripheral surface of the nozzle body 14 to form an annular first flow path 26.
Is formed.

The nozzle main body 14 is assembled to the nozzle joint by a nut 28 screwed from the fluid ejection side so as to penetrate the nozzle joint. The nozzle body 14 has an annular groove 32 communicating with the fluid passage 30 of the nozzle joint on the outer peripheral surface, and the annular groove 32 and the first passage 2 are provided.
A plurality of introduction holes 34 communicating with 6 are provided at equal angular intervals around the axis of the nozzle 10.

The commutator 16 is disposed at the downstream end of the first flow path 26, and also has a plurality of fins or flow straightening walls 36 extending in the axial direction at equal angular intervals around the axial direction of the nozzle 10. Has inside. A straightening groove 38 (see FIG. 2) is formed between the straightening walls 36 that are adjacent to each other in the circumferential direction.

The inner peripheral surface 40 of the commutator 16 cooperates with the outer peripheral surface 44 of the distal end portion of the needle 12 in the second flow path 42 whose flow path cross-sectional area decreases toward the downstream side so as to throttle and accelerate the high-pressure fluid. The receiving surface is coaxial. Second channel 4
2 has an injection port 46 for releasing the high-pressure fluid from the throttle in the second flow path 42 to release it from the pressurized state and injecting it at the downstream end.

Each straightening wall 36 is formed over the entire length of the second flow path 42 in the axial direction. Therefore, the downstream end face of the commutator 16 corresponding to the injection port 46 is formed in a non-circular shape in which a plurality of unit shapes are arranged at equal angular intervals around the axis. Needle 12
Has its tip projected downstream from the injection port 46.

In the illustrated example, each unit shape is a continuous uneven shape such as the straightening wall 36 and the straightening groove 38 adjacent to the straightening wall 36, and the non-circular end face shape has the same uneven shape. They are arranged in the circumferential direction at equal angular intervals. In the illustrated example, ten rectifying walls 36 of the same shape have ten rectifying grooves 38 of the same shape arranged at equal angular intervals around the axis.

One or more O-rings 48 are arranged between the needle 12 and the nozzle body 14 and between the nozzle body 14 and the nozzle joint, respectively. In the weft inserting device 10, the needle 12 acts as an inner member, and the nozzle body 14 and the commutator 16 act as outer members.

The high-pressure fluid flows from the high-pressure fluid source through the fluid passage 30 of the nozzle joint and the annular groove 3 of the nozzle body 14.
2 is introduced from the annular groove 32 into the annular first flow path 26 through the plurality of introduction holes 34, and then introduced from the first flow path 26 into the second flow path 42.

The high-pressure fluid introduced into the second flow path 42 is
The second flow path 4 is narrowed and accelerated in the second flow path 42 whose flow path cross-sectional area decreases toward the downstream side, and the second flow path 4 is formed at the injection port 46.
It is released from the throttle by 2 and released from the pressurized state, and is ejected from the ejection port 46 as an ejection fluid.

Since the inner peripheral surface of the injection port 46 has a non-circular shape in which a plurality of unit shapes are arranged at equal angular intervals in the circumferential direction, the inner peripheral surface and the outer peripheral surface of the injection port 46 have a plurality of the same shape. Spaces are formed at equal angular intervals in the circumferential direction. Since the flow path resistance of the high-pressure fluid is small in a large portion of such a space, the ejection fluid is ejected at a high speed from that portion.

As a result, the high-velocity fluid has a uniform velocity because the high-velocity fluid is jetted in a state of annular bundles in which a plurality of high-speed portions are arranged at equal angular intervals in the circumferential direction. Compared with the conventional technology in which the injection is performed in a ring shape, the directionality of the injection fluid is increased, and the convergence of the injection fluid is improved,
Accordingly, damage to the warp due to the diffusion of the jetted fluid is suppressed, and high-speed weft insertion is possible.

The rectifying wall 36 prevents the high-pressure fluid from entering a turbulent state before being jetted, and forms a high-speed portion of the high-pressure fluid in an annular bundle state by the rectifying grooves 38 formed between the rectifying walls 36. By reaching the injection port 46, the state of the annular bundle of the high speed portion is maintained up to the injection port 46 and the restrained state is maintained.

Referring to FIGS. 3 and 4, the weft insertion nozzle 5
0 uses the commutator 54 that does not reach the injection port 52, arranges the ring 56 on the downstream side of the commutator 54 and in the second flow path 64, and the tip of the needle 58 is downstream from the injection port 52 by the distance L1. It projects to the side.

The inner peripheral surface 60 of the commutator 54 and the inner peripheral surface 62 of the ring 56 are frusto-conical surfaces whose diameters become smaller toward the downstream side and which are continuous with each other. This allows the ring 5
6 acts as a kind of throttle valve, and the inner peripheral surface 6 of the ring 56
2 cooperates with the tip outer peripheral surface 66 of the needle 58 to form the second flow path 64 having a flow path cross-sectional area that becomes smaller downstream, and the ring 56 releases the high-pressure fluid from the restriction in the second flow path 64. From the pressurized state by the
Is formed at the lower end.

In the weft insertion nozzle 50, a plurality of straightening walls 70 extending in the axial direction are formed on the commutator 54 at equal angular intervals in the circumferential direction, and straightening grooves 72 are formed between adjacent straightening walls 70. A plurality of straightening grooves 74 extending in the axial direction are formed on the outer periphery of the tip of the needle 58 at equal angular intervals in the circumferential direction over the range of the distance L2 from the tip to the upstream side, and the straightening walls 76 are provided between the adjacent straightening grooves 74. I am trying.

In the weft insertion nozzle 50, a portion corresponding to the injection port 52 on the outer peripheral surface of the needle is formed in a non-circular end surface shape in which unit shapes are arranged in the same phase in the circumferential direction. Also in the example shown in FIG. 4, each unit shape is a continuous concavo-convex shape, for example, the flow regulating groove 74 and the flow regulating wall 76 adjacent thereto, and the non-circular end face shape has the same concavo-convex shape. They are arranged in the circumferential direction at equal angular intervals.

In the illustrated example, ten unit shapes each formed by one rectifying groove and one rectifying wall which are adjacent to each other are arranged at equal angular intervals around the axis. However, it can also be seen that five unit shapes, each formed by two straightening grooves and two straightening walls, are formed at equal angular intervals around the axis. In the weft inserting device 50, the needle 12 acts as an inner member, and the nozzle body 14, the commutator 54, and the ring 56 act as an outer member.

In the weft insertion nozzle 50, the second flow path 64
The high-pressure fluid introduced into the nozzle is throttled and accelerated in the second channel 64 whose channel cross-sectional area decreases toward the downstream side, is released from the throttle in the second channel 64 at the injection port 52, and the injection port is released. It is ejected from 52 as an ejection fluid. Therefore, also in the weft insertion nozzle 50, the same action and effect as those of the weft insertion nozzle 10 can be obtained.

The rectifying groove 74 and the rectifying wall 76 are preferably formed up to the tip of the needle 58 protruding from the injection port 52 as shown in FIG. 3, but the tip of the needle 58 is formed in the rectifying groove 74 and the rectifying wall. A circular shape may be used without forming 76. In this case, the high speed portion of the high pressure fluid is guided by the outer peripheral surface of the tip of the needle 58 to maintain the high speed. In particular, in the case where the tip outer peripheral surface of the needle 58 is circular, setting the diameter dimension of the tip outer peripheral surface of the needle 58 to be equal to or smaller than that of the rectifying groove does not hinder the flight of the high speed portion of the jet fluid. preferable.

Referring to FIGS. 5 and 6, the weft insertion nozzle 8
0 uses the commutator 84 that reaches the injection port 82, retracts the tip of the needle 86 from the downstream end of the commutator 84 to the upstream side, and sets the tip position as the ejection port 82, and the inner peripheral surface 88 of the commutator 84 is The frusto-conical surface has a smaller diameter on the downstream side.

The commutator 84 has a shape in which the commutator 54 and the ring 56 shown in FIG. 3 are integrated. Commutator 8
The inner peripheral surface 88 of No. 4 and the outer peripheral surface 90 of the tip portion of the needle 86 jointly form a second flow passage 92 having a smaller cross-sectional area on the downstream side. The injection port 82 releases the high-pressure fluid from the throttle in the second flow passage 92 and injects it.

In the weft insertion nozzle 80, a plurality of flow straightening walls 94 extending in the axial direction are formed on the inner circumferential surface of the commutator 84 at equal angular intervals in the circumferential direction, and the flow straightening grooves between the adjacent straightening flow walls 94 are formed. 96.

As shown in FIG. 6, the outer peripheral surface of the tip portion of the needle 86 has an equilateral triangular cross-sectional shape whose corners are arc-shaped apex 98 over a range of a distance L3 from the tip.
It is formed in a non-circular shape in which unit shapes are arranged at equal phases in the circumferential direction. In the example shown in FIG. 6, each unit shape is, for example, an arc-shaped top portion 98 and a surface adjacent to the top portion 98.
It has a continuous uneven shape. In the weft inserting nozzle 80, the needle 86 acts as an inner member, and the nozzle body 14 and the commutator 84 act as an outer member.

In the weft insertion nozzle 80, the second flow path 92
The high-pressure fluid introduced into the nozzle is throttled and accelerated in the second flow path 92, released from the throttle in the jet port 82, and jetted as the jet fluid from the jet port 82. Also,
The distance between the inner peripheral surface 88 of the commutator 84 and the outer peripheral surface 90 of the distal end portion of the needle 86 is minimum at the arc-shaped top 98 and maximum between the adjacent tops 98. Therefore, also in the weft insertion nozzle 80, the same operation and effect as those of the weft insertion nozzles 10 and 50 are achieved.

Referring to FIGS. 7 and 8, the weft insertion nozzle 1
00 uses the commutator 104 fitted to the nozzle body 14, projects the tip of the needle 106 from the downstream end of the commutator 104, and reduces the inner peripheral surface 108 of the commutator 104 so that the diameter dimension becomes smaller toward the downstream side. It is a conical surface.

The commutator 104 is the commutator 54 in FIG.
And the ring 56 are integrated. The inner peripheral surface 108 of the commutator 104 and the outer peripheral surface 110 of the tip portion of the needle 106 have the second flow path 1 in which the cross-sectional area decreases toward the downstream side.
12 are jointly formed. The injection port 102 releases the high-pressure fluid from the throttle in the second flow passage 112 and injects it.

In the weft insertion nozzle 100, a plurality of straightening walls 114 extending in the axial direction are formed on the commutator 104 at equal angular intervals in the circumferential direction, and the straightening grooves 116 are formed between adjacent straightening walls 114.

As shown in FIG. 8, the inner peripheral surface of the commutator 104 has an apex 118 with arc-shaped corners over the entire length range.
The unit shape is a non-circular shape in which the unit shapes are arranged in the same phase in the circumferential direction. In the example shown in FIG. 8, each unit shape is a continuous concavo-convex shape such as an arc-shaped top 118 and a surface adjacent to the top 118. In the weft inserting device 100, the needle 106
Acts as an inner member, and the nozzle body 14 and the commutator 10 are
4 and 4 act as outer members.

In the weft insertion nozzle 100, the second flow path 1
The high-pressure fluid introduced into 10 is throttled and accelerated in the second flow path 110, released from the throttle at the injection port 102, and ejected from the ejection port 102 as an ejection fluid. In addition, the inner peripheral surface 108 of the commutator 104 and the needle 10
The distance between the No. 6 and the outer peripheral surface 110 of the tip portion is the smallest at the location of the arc-shaped top 118, and is the largest between the adjacent tops 118. Therefore, even in this weft insertion nozzle 100,
The same action and effect as the weft insertion nozzles 10, 50 and 80 are achieved.

A commutator 120 shown in FIG. 9 may be used in the weft insertion nozzle 100. Inner peripheral surface 12 of commutator 120
2 and the outer peripheral surface 110 of the tip portion of the needle 106 jointly form a second flow path 124 having a smaller cross-sectional area in the downstream side. The injection port 102 supplies the high pressure fluid to the second flow path 12
It is released from the throttle in 4 and jetted.

In the embodiment shown in FIG. 9, the commutator 12
The inner peripheral surface 122 of 0 has a hexagonal sectional shape in which the corners are arcuate concave portions 126 and the adjacent concave portions bulge toward the center side over the entire length range, and the unit shape is circumferentially equal. It is formed in a non-circular shape arranged in phases. In the example shown in FIG. 9, each unit shape is a continuous concavo-convex shape such as an arc-shaped concave portion 126 and a surface adjacent to the concave portion 126.

In each of the above embodiments, the outer peripheral surface of the needle and the inner peripheral surface of the commutator are radially spaced, but at least the outer peripheral surface of the needle and the inner peripheral surface of the commutator are at the injection port. You may make it contact partially in part. In this case, since at least one of the outer peripheral surface of the needle and the inner peripheral surface of the commutator has a non-circular cross-sectional shape, a plurality of spaces that form the jet fluid in the state of an annular bundle are formed between the two.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a weft insertion nozzle according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a cross-sectional view showing a second embodiment of the weft insertion nozzle according to the present invention.

FIG. 4 is a diagram of the jet nozzle of the weft insertion nozzle shown in FIG. 3 and members around the jet nozzle as viewed from the right side.

FIG. 5 is a cross-sectional view showing a third embodiment of a weft insertion nozzle according to the present invention.

FIG. 6 is a diagram of the jet nozzle of the weft insertion nozzle shown in FIG. 5 and members around the jet nozzle as viewed from the right side.

FIG. 7 is a cross-sectional view showing a fourth embodiment of the weft insertion nozzle according to the present invention.

8 is a cross-sectional view taken along the line 8-8 in FIG.

FIG. 9 is a diagram showing another example of the commutator.

[Explanation of symbols]

10, 50, 80, 100 weft insertion nozzle 12,58,86,106 Needle 14, nozzle body 16, 54, 84, 104, 120 commutator 18 nozzle holder 20 weft 22 through hole 26 First flow path 30 fluid flow paths 32 annular groove 34 introduction hole 36, 70, 76, 94, 114 Straightening wall 38, 72, 74, 96, 116 Straightening groove 40, 60, 88, 108, 122 inner peripheral surface of commutator 42, 64, 92, 112, 124 Second flow path 44, 66, 90, 110 Needle tip outer peripheral surface 46,52,82,102 injection port 56 ring 62 Inner surface of ring

Claims (4)

[Claims] 1. An inner member having a through hole through which a weft thread passes, an outer member into which the inner member is inserted, and an annular first flow path, which is continuous with and flows downstream from the first flow path. An outer member having an inner peripheral surface coaxially with the outer peripheral surface, the inner peripheral surface forming a second flow path having a road cross-sectional area decreasing toward the downstream side in cooperation with the outer peripheral surface of the inner member; The flow path has an injection port for injecting a high-pressure fluid at a downstream end, and at least one of an inner side and an outer side of a cross section corresponding to a position of the injection port of the second flow path has a unit shape on both circumferential surfaces. Weft insertion nozzle of a fluid jet loom, which is formed in a non-circular shape with a plurality of equiangular intervals arranged around the axis of the. 2. At least one of the inner member and the outer member has a plurality of flow straightening walls formed at equal angular intervals with respect to the axes of the peripheral surfaces, upstream of the injection port.
The weft insertion nozzle according to claim 1. 3. The outer member is the nozzle body into which the inner member is inserted, and an annular member disposed in the nozzle body, wherein the second flow path is formed in cooperation with the inner member. The weft insertion nozzle according to claim 1 or 2, further comprising: 4. The weft insertion nozzle according to claim 2, wherein the straightening wall reaches at least the injection port.