JP3120042B2 - Nozzle for fluid jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle for a fluid jet loom, and more particularly, to a nozzle extending radially from an inner peripheral surface of a nozzle body facing an outer peripheral surface of a distal end portion of a needle inserted into the nozzle body. The present invention relates to a nozzle for a fluid jet loom in which a plurality of fins are arranged at equal intervals in a circumferential direction, and a fluid from an annular chamber formed in a nozzle body is jetted after passing between the plurality of fins.

[0002]

2. Description of the Related Art Fins extending radially from an inner peripheral surface of a nozzle body facing an outer peripheral surface of a distal end portion of a needle inserted into the nozzle body are arranged at equal intervals in a circumferential direction and formed on the nozzle body. The fluid from the closed annular chamber is passed between the plurality of fins, thereby rectifying the fluid. By carrying the weft on the rectified jet fluid, stable weft insertion can be performed. (For example, Japanese Patent Publication No. 4-18053 or Japanese Utility Model Application
See the full text specification of JP 88779. )

[0003]

In a conventional nozzle for a fluid jet loom such as an air jet loom or a water jet loom, the fins are provided on both sides 10, 1 as shown in FIG.
The intersection angle θ of 0 was constant from the base side to the top side, and was formed to be constant from the fluid inlet side end to the outlet side end.

The base of the fin is adjacent to the fin.
The portion near the bottom of the groove formed by the two fins is referred to, and the top of the fin is near the end on the center side of the nozzle body.

[0005] In a conventional nozzle for a fluid jet loom having fins, the width T of the inner end face of the fin facing the outer peripheral face of the tip of the needle, particularly the inner end face of the fin near the fluid outlet end 8. Cannot be reduced sufficiently, and sufficient rectification cannot be performed.

Specifically, the pressure fluid moving in the groove formed by two adjacent fins joins the fluid moving in the adjacent groove near the fluid outlet end of the fin.
At this time, if the thickness T of the inner end face of the fin separating the two grooves is large, there is a problem that a smooth merging is hindered and turbulence is induced by vortex generation, and a sufficient rectifying effect cannot be obtained.

In order to solve this problem, the width T 'of the inner end face of the fin is set by setting the intersection angle θ between the side faces 10, 10 of the fin large as shown by the two-dot chain line in FIG.
(<T) may be reduced. However, if the intersection angle θ is simply reduced, the thickness of the fin becomes thinner from the base to the top, resulting in insufficient strength. For this reason, when the pressurized fluid flows into the groove, the fins are displaced by vibration, and there has been a problem that a sufficient rectifying effect cannot be obtained.

An object of the present invention is to obtain a sufficient rectifying effect by reducing the width of the inner end surface of the fin near the fluid outlet side end while maintaining sufficient strength of the fin.

[0009]

In order to achieve the above object, according to the present invention, there is provided a fin extending in a radial direction from an inner peripheral surface of a nozzle body opposed to an outer peripheral surface of a tip end portion of a needle inserted into the nozzle body. Are arranged at equal intervals in the circumferential direction, and the fluid from the annular chamber formed in the nozzle body is passed through the space between the plurality of fins. The fins are formed so that the intersection angle (θ1) on the top side near the fluid outlet end is larger than the intersection angle (θ0) on the base side near the fluid inlet end.

The fin has a crossing angle (θ1) on the top side larger than a crossing angle (θ0) on the base side and each crossing angle (θ0).
, Θ1) are constant from the fluid inlet end to the outlet end.

The fin is a crossing angle between both side surfaces of the fin, the crossing angle on the top side is gradually increased toward the center of the nozzle body, and each crossing angle on the top side and the base side is defined as a fluid inlet. It shall be constant from the side end to the exit side end.

The fin is formed such that the crossing angle of the both sides of the fin gradually increases from the fluid inlet end to the fluid outlet end.

The fin is formed such that the crossing angle of both side surfaces of the fin is constant from the fluid inlet side end to the outlet side end, and thereafter gradually increases toward the outlet side end.

The fins have a constant crossing angle on both sides of the fin from the fluid inlet side end to the outlet side end, and thereafter, only the crossing angle on the top side gradually increases toward the outlet side end. It is formed so that

[0015]

The fin is formed such that the crossing angle on the top side near the fluid outlet side end is larger than the crossing angle on the base side near the fluid inlet side end. Since the thickness of the fin at the base side is maintained at a desired value, the width of the inner end surface of the fin near the fluid outlet side end can be reduced without unnecessarily reducing the strength of the fin.

[0016] Thus, the fluid moving in each groove can be merged with the turbulent flow suppressed as much as possible without causing the fins to vibrate when the fluid flows into the groove.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows a nozzle 100 for a fluid jet loom of the present invention, and more particularly, a nozzle 100 for a water jet loom. The nozzle body 1 has a hollow shape, and the needle 2 is inserted therethrough. The nozzle body 1 has a flange 3 at the rear end and an annular chamber 5 at the middle. In the annular chamber 5,
A plurality of water guide holes 6 communicating with the inside of the nozzle body 1 are open. These water guide holes 6 are provided at equal intervals in the circumferential direction.

The nozzle body 1 has a holder 7 connected thereto.
The holder 7 is fastened and fixed to the flange 3 by a cap 9 screwed to the tip of the nozzle body 1.

The needle 2 has a tapered tip 4 and a yarn introduction hole 13 formed in the center.

The nozzle body 1 has a plurality of fins 15,.
, 15 are built in. Commutator 1
Reference numeral 7 shows the distal end 4 of the needle 2 inserted concentrically into the tapered hole 19.

The commutator 17 will be described in detail with reference to FIGS. 1, 3 to 5. The commutator 17 has a plurality of fins 15 extending toward the center of the nozzle body 1 at equal intervals in the circumferential direction. In this embodiment, 18 fins are formed (FIG. 4). These fins 15,..., 15 extend so that each inner end surface 23 is located on an extension of the inner peripheral surface of the tapered hole 19 (FIGS. 1, 3).

Of the plurality of fins 15,... 15, two adjacent fins form grooves 25,. The bottom surface 27 of the groove 25 has a tapered shape with a larger inclination than the tapered hole 19. Therefore, the height of the fin 15 gradually decreases toward the tapered hole 19, and becomes zero at the boundary with the tapered hole 19.

FIG. 5 is an enlarged view of a portion surrounded by a chain line in FIG.

The fin 15 has an intersection angle θ 1 between the top side surfaces 29 near the fluid outlet end 8 of the fin 15.
Are both sides 31, 31 near the base end near the fluid inlet end.
Are formed so as to be larger than the intersection angle θ0.
Further, the intersection angle θ1 between the top side surfaces 29, 29 and the intersection angle θ0 between the base side surfaces 31, 31 are constant from the fluid inlet side end to the outlet side end, respectively. In addition, both side surfaces 31, 31 on the base side are formed (FIG. 1). In FIGS. 4 and 5, for convenience of drawing, the intersection angles of both side surfaces of the fin 15 are shown to be constant from the base to the top.

Therefore, the intersection angle θ 1 between the top side surfaces 29 near the fluid outlet side end of the fin 15 is smaller than the base side surface 3 near the fluid inlet side end of the fin 15.
It is larger than the intersection angle θ0 between 1 and 31.

By configuring the fins 15 in this manner, the fins 15 have a sufficient thickness on the base side and have a narrow inner end surface.

The pressure water discharged from a pump (not shown) reaches the annular chamber 5 of the nozzle body 1 through the water passage 11 of the holder 7 and flows into the nozzle body 1 through the water passage hole 6.

Thereafter, the pressure water is supplied to the plurality of grooves 2 of the commutator 17.
Flow into 5. The pressurized water converges toward the tip 4 of the needle 2 in the process of moving along the bottom surface 27 of the groove 25. The pressure water moving in each groove 25 is accelerated when passing through the tapered hole 19 while joining between the tapered outer peripheral surface of the tip end portion 4 of the needle 2 and the inner end surface of the fin 15. And
It is jetted from the tip of the nozzle body 1 together with a weft (not shown) inserted into the yarn introduction hole 13.

The fin 1 of the commutator 17 shown in this embodiment
5 and the tapered hole 19 can be manufactured by a wire electric discharge machine.

That is, the material of the commutator 17 having a through hole formed as a pilot hole at the center is fixed to a processing machine, and a wire is passed through the through hole. A high voltage is applied to this wire, and electrical discharge machining is performed while the wire is stretched while performing NC control on the position of the wire.

The top side surfaces 2 in the above embodiment
The angle of intersection θ1 between 9, 29 is on both sides 29, 2 on the top side.
9 can be increased by tilting only one side surface 29 in the direction approaching the other, instead of tilting them together in the approaching direction and making them larger than the intersection angle θ0. Further, the intersection angle θ1 may be set so that the width t of the inner end face becomes substantially zero.

The nozzle for a fluid jet loom according to the present invention comprises:
The type in which the commutator 17 is built in the nozzle main body 1 may be used, or the type in which the fin 15 and the tapered hole 19 are formed integrally with the nozzle main body 1 may be used. Further, the taper hole 19 may be formed integrally with the nozzle body 1 and a commutator constituting other portions may be incorporated.

[0034]

[Other Embodiments] Both sides 29, 2 on the top side of the fin 15
9 may be gradually increased toward the center of the nozzle body 1 (FIG. 6). That is, the both sides on the top side may be formed in an arc shape that is convex toward the groove 25 side.

According to this embodiment, since the corners 33 are not formed on the side surfaces of the fins 15, it is more advantageous in rectifying the pressure water.

Regarding the intersection angle between both side surfaces of the fin 15, it is not possible to form the fin 15 so that the intersection angle on the top side near the fluid outlet end is larger than the intersection angle on the base side near the fluid inlet end. , And the embodiment shown in FIG.

The intersection angle between the both sides of the fin 15 is constant from the base to the top at the fluid inlet end, and gradually increases as the intersection angle approaches the fluid outlet side end. Note that the inclination of one side surface of the fin 15 is
It is indicated by a two-dot chain line at a plurality of locations.

Moreover, the width of the inner end surface 23 gradually decreases toward the fluid outlet side end, and becomes almost zero at the fluid outlet side end.
It is formed so that it becomes. Therefore, the commutator 17 shown in FIG. 7 is more advantageous for merging without turbulence of the pressure water.

In the embodiment shown in FIG. 7, the position at which the intersection angle starts to increase may be in the middle of the extending direction of the fin 15 instead of from the end on the fluid inlet side (FIG. 8). .

In the embodiment shown in FIG. 8, when the crossing angle is gradually increased from the middle of the extending direction of the fin 15, instead of changing the crossing angle of the side surface from the base to the top similarly. Alternatively, only the intersection angle on the top side may be gradually increased (FIG. 9).

[0041]

According to the present invention, the width of the inner end face at the fluid outlet side end of the fin can be reduced without unnecessarily reducing the strength of the fin. Therefore,
A sufficient rectification effect of the fluid can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially enlarged view of a commutator according to the present invention.

FIG. 2 is a longitudinal sectional view of a nozzle for a fluid jet loom of the present invention.

FIG. 3 is a longitudinal sectional view of a fin according to the present invention.

FIG. 4 is a front view of a fin according to the present invention.

FIG. 5 is a partially enlarged view of FIG. 4;

FIG. 6 is a partially enlarged view of a commutator according to another embodiment.

FIG. 7 is a partially enlarged view of a commutator according to another embodiment.

FIG. 8 is a partially enlarged view of a commutator according to another embodiment.

FIG. 9 is a partially enlarged view of a commutator according to another embodiment.

FIG. 10 is a view showing a commutator of a conventional nozzle for a fluid jet loom.

[Explanation of symbols]

 15 Fin 17 Commutator 25 Groove 27 Bottom 29 Top side 31 Base side

Claims (6)

(57) [Claims] 1. A plurality of fins extending radially from an inner peripheral surface of a nozzle body facing an outer peripheral surface of a distal end portion of a needle inserted into the nozzle body and arranged at equal intervals in a circumferential direction and formed on the nozzle body. The fluid from the annular chamber is passed through the plurality of fins and then ejected after the fluid ejection loom nozzle, wherein the intersection angle of the fins on both sides and the intersection on the base side near the fluid inlet end. A nozzle for a fluid jet loom, wherein the fins are formed so that the intersection angle (θ1) on the top side near the fluid outlet end is larger than the angle (θ0). 2. The fin has a crossing angle (θ1) on the top side larger than a crossing angle (θ0) on the base side and a crossing angle (θ1) on both sides of the fin.
2. The nozzle for a fluid jet loom according to claim 1, wherein 0, .theta.1) are constant from the fluid inlet end to the outlet end. 3. The fin is an intersection angle between both side surfaces of the fin, wherein the intersection angle on the top side is gradually increased toward the center of the nozzle body, and each intersection angle on the top side and the base side is 2. The nozzle for a fluid jet loom according to claim 1, wherein the nozzle is constant from a fluid inlet side end to an outlet side end. 4. The nozzle for a fluid jet loom according to claim 1, wherein the fin gradually increases an intersection angle between both side surfaces of the fin from a fluid inlet side end to an outlet side end. 5. The fin, wherein the crossing angle of both sides of the fin is constant from the fluid inlet side end to the outlet side end,
2. The nozzle for a fluid jet loom according to claim 1, wherein the nozzle is gradually increased thereafter toward the outlet end. 6. The fin, wherein the crossing angle of both sides of the fin is constant from the fluid inlet side end to the outlet side end,
2. The nozzle for a fluid jet loom according to claim 1, wherein only the intersection angle on the top side is gradually increased thereafter toward the outlet side end.