JPH0411048A - Structure of the nozzle part of water jet nozzles for looms - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a water jet nozzle for high-speed looms.

[Conventional technology]

The applicant of the present application previously applied for Japanese Patent Application No. 164531/1983 by using a high-hardness and corrosion-resistant material such as zirconia to create a nozzle member such as a needle and an orifice that turns a high-pressure water stream into a water jet and sends out a weft thread. A structure of a nozzle part of a water jet nozzle for a loom in which a stabilizer part and a stabilizer part are integrated is disclosed.

As shown in FIG. 8, this nozzle member has a stabilizer part d integrally formed on the water flow introduction side of the orifice part of the main body a via an annular shape aC for adjusting the water flow.

This stabilizer ld has a slit 7 having the same width in the radial direction.
) By forming 10 or more blades (e) at the same interval using blades (f) with reduced tip thickness, a jet water stream with good convergence is obtained. By forming the entrance of the orifice portion in a curved shape and forming the inner surface of the stabilizer portion d with a taper toward the orifice portion, the water jet water flow can be effectively rectified.

As a result, as shown in Fig. 9, the needle N can be attached to the opening of the stabilizer part d and the central opening of the orifice part d, and the weft thread from the needle N can be smoothly inserted by the rectified jet water flow W. This effectively functions to form a jet water stream with sufficient convergence in a loom where the number of weft thread insertions is about 1000 times/min or less.

However, when the integrated nozzle member and needle are used to send out the weft yarn at high speed, a shock wave-like splash, which is thought to be caused by air resistance A, occurs at the initial stage of the jet water stream, as shown in Figure 10. A spread B1 occurs, and then a shock wave-like spread B2 of water spray occurs at a position of 150 to 300 mm from the nozzle. The spread of this spray disappears when it hits the warp threads, but at that time it may have a slight effect on the warp threads.

[Problems to be Solved by the Invention] The present invention reduces fluid resistance in a nozzle member that has an integral structure of an orifice part and a stabilizer part, and reduces the spread of shock waves of jet water flow, thereby reducing the impact on warp threads. The aim is to reduce the impact over a long period of time and obtain superior textiles.

[Means to solve the problem]

In the present invention, the stabilizer part, the orifice part, and the needle are integrally formed with a highly hard and corrosion-resistant material, and the slits are isotropically formed and arranged in the stabilizer part, and the bottom surface of the slit groove formed in the stabilizer part is It is characterized by having a continuous shape with the inner surface taper of the orifice part.

The high hardness and corrosion resistant material used in the present invention has a bending strength of 70 J/mm' or more, preferably 100 kg/mm'.
mm2 or more, and the hardness is H11A 90 or more, preferably 91
As described above, by using ceramics having an elastic modulus of 1.5 x 10' or more, especially zirconia, a stable and long-life water jet nozzle can be obtained.

[Effect]

It was found that the presence of the annular groove formed for water flow adjustment disclosed in the previous application did not exhibit sufficient performance in suppressing the generation of such shock waves, so in the case of high-speed flow, such an annular groove was eliminated. This is based on the clarification that the spread of shock waves is reduced by reducing fluid resistance through the shape.

In other words, when a needle is attached to the center of the curved surface from the stabilizer part to the orifice part and a high-pressure water stream is sent, the smooth flow path of the orifice part creates a gap between the curved surface and the needle surface even at ultra-high speeds. The jet water stream is maintained in a completely rectified state, and the jet water stream injected from the nozzle has good convergence by controlling the primary and secondary shock waves, especially the spread of the secondary shock waves, which are thought to be caused by air resistance. Since a water jet can be obtained, it becomes possible to obtain higher quality textiles at high speed.

Generally, the inner surface of the orifice part has a taper angle that reduces the inner diameter from the fluid inlet to the outlet.
In the case of the present invention, the intersection angle between the taper of the inner surface of the orifice and the axial center line of the nozzle is 2° to 7.5°, preferably 3° to 6°. In combination with this, it is possible to obtain a high-speed jet stream with good rectification.

Here, if the intersection angle is smaller than 2°, it is necessary to increase the length of the nozzle member itself, and if it is larger than 7.5°, the length of the stable water flow portion becomes short.

In addition, the intersection angle (indicated as α in the attached drawings) between the starting part of the slit groove bottom formed in the stabilizer part and the extension line of the taper angle on the inner surface of the orifice part is made larger than 92°, preferably 92° or more. The more the high-pressure fluid resistance can be reduced, the more excellent jet water flow can be obtained.

In addition, the intersection angle with the tangent line of the starting part of the slit groove bottom is 9
When it approaches 0, the fluid resistance can be reduced by forming a continuous curved surface on the inner surface of the orifice.

〔Example〕

Embodiment 1 FIG. 1 shows a cross-sectional view (a) and a plan view taken along the line bb line (b) of a nozzle member according to a first embodiment of the present invention.

Referring to FIGS. 1(a) and 1(b), the nozzle member 10 is made of silcony gamma material in which a fluid artificial part, that is, a stabilizer part 1 and an orifice part 2 are integrally formed. A slit 3 is formed isotropically to form a blade 4 with a tip thickness of 0.01 mm or more at the inner diameter part, and the intersection point of the slit bottom surface 5 and the taper on the inner surface of the orifice portion 2 is connected behind it with a curved surface R. .

Furthermore, the bottom surface of the slit formed in the stabilizer part 1,
That is, the intersection angle α between the tangent to the starting portion of the groove bottom and the extension of the taper angle of the orifice portion 2 is set to be 92° or more in all of the examples below.

Embodiment 2 FIG. 2 shows a nozzle member 20 as a second embodiment of the present invention.
A cross-sectional view (a) and a plan view taken along the line bb line (b) are shown.

With reference to FIG. 2 (a> (b)), stabilizer section 1
1 has a plurality of slits 12 of the same width arranged in the center direction from the outer peripheral surface of the base body at the same intervals in order to withstand the high-pressure water introduced. , and the stabilizer part 11
The inner diameter surface 15 of the blade and the end surface 19 are joined by a curve 14,
The slit bottom 16 also has a curved shape that continues with the taper angle of the orifice portion 17. Because its shape has a gently curved surface, fluid resistance is reduced even when fluid passes at high speed, and a jet stream with a small spread of shock waves can be obtained. Since it is formed large, it will not be damaged and a jet water stream with good rectification properties can be obtained.

Conversely, the slit 12 shown in FIG. 2 may be a blade, and the slit 13 may be formed into a slit that is concave in the radial direction. The fluid flowing in from the outer circumferential direction is smoothly introduced into the orifice part, and the 700
The structure can be suitable for a high-speed type nozzle that runs more than once per minute.

In this case, from the stabilizer part 11 to the orifice part 1
7. The jet water stream forms a rectification at the outlet 18 of the orifice portion 17. Moreover, even if a strong impact flow acts on the blade 12, the blade 12 can be formed relatively thick, so high impact resistance can be obtained, and a stable jet water flow can be obtained without vibration of the blade.

As a result, when a needle N as shown in FIG. 9 is attached to the center of the opening of the nozzle member 20 and a high-pressure water stream is passed through it, a jet water stream with good convergence can be obtained, and the water stream is extremely high speed. Even in such a state, it can be made into a rectified jet water flow, and the weft yarn from the needle N can be sent out smoothly at high speed.

Embodiment 3 FIG. 3 shows a sectional view (a) and a plan view taken along b-bl arrows (b) of a nozzle member 30 according to a third embodiment of the present invention.

In this figure, R grooves 33 are formed linearly and equidistantly from the inner diameter surface of the end surface which is an extension of the taper of the inner surface of the orifice portion 31.

Embodiment 4 FIG. 4 shows a sectional view (a) and a plan view taken along the line bb--b of a nozzle member 40 according to a fourth embodiment of the present invention.

In this figure, the orifice part inner diameter start 842 and the stabilizer part inner diameter surface 45 are curved surfaces, and the groove bottom 43 of the R groove 44 is curved.
The curved surface is guided to the tapered corner of the orifice.

Example 5 As the nozzle member 50 of the fifth example, Fig. 1.4 (a)
The inner R groove bottom 43 is made straight as shown in the cross-sectional view of the nozzle member shown in FIG.
It is possible to reduce fluid resistance and obtain a jet water stream with good rectification without blade vibration.

Example 6.7 The nozzle members 60 and 70 in FIGS. 6 and 7 are
An embodiment is shown in which the slits 62 and R grooves 71 in each of the stabilizer parts of the nozzle members 10, 20, 30, and 40 shown in the above figures are formed in a direction eccentric to the center of the nozzle.

As a result, rotational force is applied to the jet water stream, and the spread of the shock wave is further reduced.

Furthermore, similar effects can be obtained by combining the shapes shown in the figures of the above-described embodiments.

〔Effect of the invention〕

The following effects can be achieved by the present invention.

(1) Even when generating ultra-high-speed jet water, the high-speed fluid formed between the needle and the inner diameter of the orifice does not cause vibration of the blades in the stabilizer section, and it is possible to obtain a high-speed jet with good convergence. can.

(2) Since the nozzle member, needle, etc. integrated with the stabilizer part and the orifice part are made of a highly hard and corrosion-resistant material, they can withstand the formation of ultra-high-speed water jets for a long period of time.

(3) Since the stabilizer part and orifice part are integrated into a simple shape, manufacturing and assembly are easy.

(4) The blades in the stabilizer part do not vibrate and can be used on high-speed looms running at over 1000 times/min.

(5) Stable weft insertion is possible even at ultra-high speeds, the spread of secondary shock waves is also reduced, and there is no uneven weaving.
Excellent woven fabrics can be obtained, and it can also be used as a nozzle for woven fabrics that are wider than conventional ones.

[Brief explanation of the drawing]

FIGS. 1 to 4 show a first embodiment of the nozzle member of the present invention.
A fourth embodiment is shown, in which (a) is a sectional view and (a) is a plan view taken along the line bb. FIG. 5 is a sectional view showing a fifth embodiment of the nozzle member of the present invention, and FIGS. 6 and 7 show an embodiment in which the slit and R groove of the nozzle member are formed eccentrically to the center of the nozzle. FIG. FIG. 8 is a perspective view, partially in section, of a conventional nozzle member. FIG. 9 is a diagram showing the same operating state with the conventional nozzle member attached. FIG. 10 is a diagram schematically showing problems caused by conventional nozzles. 1.11. Ni stabilizer part 2, 1? , 31.41 Niorifice part 4.13.6
1 Ni blade 3.12, 62 Ni blade 5.16: Slit bottom 6.19 Ni stabilizer part end face 7.18 Ni orifice part outlet 10, 20.30.40.50.60.70: Nozzle member 14: Curve 15.45 + Blade inner diameter surface 32.43.53
: R groove bottom 33, 44.54.71 : R groove 42.52 Niorifice part inner diameter start part two curved surfaces two bodies b = Nio9F4F annular groove
d Nistabilide part, slit f;
Blade: Needle W: Jet water flow; Air resistance force, B2: Spread of water spray Stabilizer orifice integrated member needle
F: Weft

Claims (1)

[Claims] 1. The stabilizer part, the orifice part, and the needle are integrally formed of a highly hard and corrosion-resistant material, and slits are isotropically formed and arranged in the stabilizer part, and slits are formed in the stabilizer part. The structure of the nozzle part of a water jet nozzle for a loom, which has a shape in which the bottom surface of the slit groove and the inner taper of the orifice part are continuous. 2. The structure of a nozzle part in a water jet nozzle for a loom according to claim 1, characterized in that the slit groove formed in the stabilizer part is eccentrically formed with respect to the axial center of the nozzle.