JPH08260295A - Nozzle structure of water jet nozzle for loom - Google Patents

Abstract

(57) [Summary] [Purpose] In the water jet nozzle for loom,
By constructing a nozzle member with low fluid resistance, stable high-speed weft insertion is possible. [Construction] A guide channel in which slit grooves are isotropically formed in an orifice portion and a stabilizer portion which are integrally formed by fitting, and the width shape of these slit grooves is reduced in two steps toward the orifice side. To stabilize weft insertion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a water jet nozzle for a high speed loom.

[0002]

2. Description of the Related Art The applicant of the present application has previously filed Japanese Patent Application No. 2-1096.
No. 40 application discloses a structure of a nozzle portion of a water jet nozzle for a loom in which a stabilizer portion, an orifice portion and a needle are integrally formed of a material having high hardness and corrosion resistance such as zirconia.

As shown in FIG. 3, this nozzle member has a stabilizer C integrally formed on the pressure water introduction side of an orifice b of a main body a. Further, in the stabilizer portion C, the slit groove d is isotropically formed and arranged, and the bottom surface of the slit groove d and the inner surface taper e of the orifice portion b are continuously formed by the curve f, so that the pressure water is effectively rectified. It will be transformed. This effectively functions to form a stable and highly convergent jet water flow at a high speed operation of 1000 rpm or more.

However, when the weft yarn is delivered at a high speed by using the nozzle member and the needle which are integrally structured in the previous application, it is considered that the air resistance A is caused in the initial stage of the jet water flow as shown in FIG. Splashes _{B 1} is generated as the shock wave, then results in spreading _{B 2} splashes such as shock waves 150 to 300 ▲ millimeter ▼ position from the nozzle. The spread of the splashes hits the warp yarn and slightly affects the warp yarn.

[0005]

DISCLOSURE OF THE INVENTION The present invention is excellent in that the influence on the weft is reduced for a long time by further reducing the fluid resistance in the nozzle member in which the orifice portion and the stabilizer portion are integrated. It is intended to obtain a woven fabric.

[0006]

DISCLOSURE OF THE INVENTION According to the present invention, in a nozzle member having an integrated structure by fitting an orifice member and a stabilizer member formed of a corrosion resistant material, the orifice member and the stabilizer member are isotropic in the radial direction, respectively. Form a slit groove that serves as an inflow path for pressure water,
It is characterized in that the width of the slit groove is provided with a guide channel that is reduced in two steps toward the orifice member side.

[0007] Further, only the stabilizer member may be provided with a guide flow path which is reduced toward the orifice member side.

If a super hard alloy, cermet, ceramics or stainless steel-based material is used as the corrosion resistant material used in the present invention, a stable and long-life water jet can be obtained.

[0009]

[Function] In the case of a high-speed flow, it was found that the shock wave generation due to the width shape of the slit groove, which is the passage for introducing pressure water in the stabilizer section disclosed in the previous application, does not exhibit sufficient performance. By providing a guide channel in which the width shape of the slit groove is reduced toward the orifice portion, the fluid resistance is extremely reduced, thereby increasing the convergence.
This is based on the clarification that the spread of shock waves becomes smaller.

That is, the width shape of the rectifying slit groove, which is isotropically located in the radial direction, is reduced from the pressure water introduction side toward the jet water discharge outlet side, and a needle is attached to the center thereof. When a high-speed flow is sent, a smooth flow path with little pressure loss from the stabilizer section to the orifice section maintains a completely rectified water flow between the needle surface and the super-high-speed state, and The jet water flow jetted from the peripheral surface of the nozzle can control the spread of the primary shock wave and the secondary shock wave, especially the secondary shock wave, which is considered to be due to air resistance, to obtain a jet water flow with good convergence. High quality fabrics can be obtained at high speed.

[0011]

FIG. 1 is a sectional view (a) of a nozzle member as a first embodiment of the present invention, a side view (b) taken along the line bb of FIG.
It is a partially cutaway plan view (c) taken along the line -c.
Referring to FIGS. 1 (a), (b) and (c), a nozzle member 13 has a stabilizer portion 1 having a slit groove 3 for introducing pressure water, and an orifice portion having a slit groove 4 to be a fluid path next. The positions of the slit grooves 2 are aligned isotropically, the respective end surfaces 5 are brought into close contact with each other, and the peripheral surface 6 is press-fitted, and the stabilizer portion 1 and the orifice portion 2 are integrated.

The bottom portions 7 and 8 of the slit grooves 3 and 4 located in the radial direction of the nozzle member 13 having an integrated structure.
Is the curved portion 9 and the tapered surface 10 on the inner surface of the orifice portion 2.
Then, it is continuously formed.

The slit grooves 3 and 4 have guide passages 11 and 12 in the width direction which are shaped so as to reduce toward the orifice portion 2 so that pressure water can be introduced easily.
That is, due to the smooth shape of the slit groove portions 3 and 4, the fluid resistance is reduced even when the fluid passes at a high speed, and a jet water flow with a small spread of the shock wave is obtained.

[0014]

[Embodiment 2] FIG. 2 is a sectional view (a) of the nozzle member as a second embodiment of the present invention, a side view (b) taken along the line bb in FIG.
It is a figure which shows the cc line arrow plane view (c).

Referring to FIGS. 2 (a), (b) and (c), the nozzle member 29 has slit grooves 22 only in the stabilizer portion 21 as compared with FIG. 1, and the orifice portion 23 and the respective end faces 24 are in close contact with each other. Then, the stabilizer portion 21 and the orifice portion 23 are integrated by press-fitting on the circumferential surface 25.

The end face 24 of the bottom surface of the slit groove 22 located in the radial direction of the nozzle member 29 having an integrated structure, the curved portion 26 and the tapered surface 27 of the inner surface of the orifice portion 23 are formed.
Are continuously formed.

Further, the widthwise shape of the slit groove 22 has a guide flow path 28 having a shape which is reduced toward the orifice portion 23 side so that pressure water can be introduced easily.

Due to the smooth shape of the slit groove portions 22, a jet water flow having a small shock wave spread, in which the fluid resistance is reduced as in the first embodiment, can be obtained.

[Brief description of drawings]

FIG. 1 (a) is a sectional view showing a main part of a water jet nozzle for a loom of the present invention.

FIG. 1 (b) is a right side view taken along the line bb of FIG. 1 (a).

FIG. 1 (c) is a partially cutaway plan view taken along the line cc of FIG. 1 (a).

FIG. 2 (a) is a cross-sectional view showing a main part of a water jet nozzle for a loom showing another example.

2 (b) is a right side view taken along the line bb of FIG. 2 (a).

FIG. 2 (c) is a plan view taken along the line cc of FIG. 2 (a).

FIG. 3 shows a cutaway sectional view of a conventional nozzle member.

FIG. 4 is a diagram showing a configuration of a conventional nozzle unit and a phenomenon of water jet water flow.

[Explanation of symbols]

1 Stabilizer Part 2 Orifice Part 3 Slit Groove 4 Slit Groove 5 End Face 6 Circumferential Surface 7 Slit Groove Bottom Part 8 Slit Groove Bottom Part 9 Curved Part 10 Tapered Surface 11 Guide Flow Path 12 Guide Flow Path 13 Nozzle Member 21 Stabilizer Part 22 Slit Groove 23 Orifice portion 24 End surface 25 Circumferential surface 26 Curved portion 27 Tapered surface 28 Guide flow path 29 Nozzle member a Main body b Orifice portion c Stabilizer portion d Slit groove e Inner surface taper f Curve A Air resistance B ₁ Spread of water B ₂ Water splash Spread C Jet water flow D Nozzle member E Needle F Weft

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[Procedure amendment]

[Submission date] April 9, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 (a) is a sectional view showing a main part of a water jet nozzle for a loom of the present invention, and FIG. 1 (b) is a sectional view (a).
FIG. 3C is a right side view taken along the line bb of FIG.
Shows a partially cutaway plan view taken along the line cc of the sectional view (a).

FIG. 2A is a cross-sectional view showing a main part of a water jet nozzle for a loom showing another example, and FIG. 2B is a right side view taken along the line bb of the cross-sectional view of FIG. Indicates that
(C) shows the top view by the cc arrow line of sectional drawing (a).

FIG. 3 shows a cutaway sectional view of a conventional nozzle member.

FIG. 4 is a diagram illustrating a conventional nozzle configuration and a phenomenon of water jet nozzle water flow.

[Explanation of symbols] 1 Stabilizer part 2 Orifice part 3 Slit groove 4 Slit groove 5 End face 6 Circumferential surface 7 Slit groove bottom view 8 Slit groove bottom view 9 Curved part 10 Tapered surface 11 Guide channel 12 Guide channel 13 Nozzle member 21 Stabilizer part 22 Slit groove 23 Orifice part 24 End face 25 Circumferential surface 26 Curved part 27 Tapered surface 28 Guide flow path 29 Nozzle member a Main body b Orifice part c Stabilizer part d Slit groove e Inner surface taper f Curve A Air resistance B ₁ Water splash Spread B ₂ Spread of water C Jet water flow D Nozzle member E Needle F Weft

Claims (2)

[Claims] 1. A nozzle member having an integrated structure formed by fitting an orifice member and a stabilizer member, which are formed of a corrosion-resistant material, into the orifice member and the stabilizer member, respectively, isotropically inflowing pressure water in the radial direction. Nozzle portion in a water jet nozzle for a loom, characterized in that a slit groove that serves as a path is formed, and a width of the slit groove is provided with a guide channel that is reduced in two steps toward the orifice member side. Structure. 2. A guide flow path is formed only in the stabilizer member in a radial direction to form a slit groove that isotropically serves as a flow path for pressure water, and the width shape of the slit groove is reduced toward the orifice member side. The structure of the nozzle portion in the water jet nozzle for a loom according to claim 1.