Pick jet nozzle of water jet loom

Abstract

In the weft inserting nozzle with which straightening fins are arranged between a ring-shaped chamber and a nozzle, a plurality of straightening fins are arranged on the inner peripheral surface of a nozzle main body at intervals in the circumference direction and extended on the outer peripheral surface of a needle in the nozzle axis direction, the bottom of a straightening groove defined by the inner peripheral surface of the nozzle main body and the adjacent straightening fins is extended in the same direction as that of the generatrix of the inner peripheral surface of the nozzle main body and the side faces of the straightening fins are extended so that the central lines of the straightening fins have angles to the radial directions. A jet water flow having uniformity as a while is injected by the weft inserting nozzle of a water injection type. Diffusion after the injection is reduced to improve productivity of woven fabric.

Description

technical field [0001] The invention relates to a weft insertion nozzle of a water jet loom. Background technique [0002] In order to reduce the spread of the pressure water sprayed from the weft insertion nozzle, there are examples listed in Patent Documents 1 to 3 described later: the shape of each part such as the needle and the nozzle main body has been repeatedly improved from the straightening member. The weft injection nozzle of the water jet loom is provided with: a needle forming a guide hole through which the weft yarn passes, a nozzle body forming a hollow part for inserting the needle and having a water supply hole communicating with the outer peripheral surface, and a nozzle body passing through the needle. The annular chamber defined by the outer peripheral surface and the inner peripheral surface of the nozzle body is composed of a rectifying member and the like that are installed in the nozzle body at a position between the annular chamber and the spray hole...

AI Technical Summary

Problems solved by technology

[0009] However, in any of the techniques of these Patent Documents 1 to 3, the rectifying vanes or rectifying grooves are formed along the axial direction of the nozzle, and the pressurized water passing through each rectifying groove merges while colliding violently with the outer periphery of the needle. Problems with turbulent flow or large spread of jet water after jetting

Furthermore, according to the technique of Patent Document 4, since the straightening groove is provided eccentrically with respect to the nozzle axis, the pressurized water passing through the straightening groove has a velocity component swirling around the nozzle axis and is ejected, thereby generating a centrifugal force due to the swirling. problem of facilitation of diffusion

Moreover, because the water flow is swirling as a whole, the swirling water volume is relatively large, and the result of the centrifugal force acting on the sprayed water flow is: the water flow is not uniform as a whole, and it cannot be said to be a practical weft insertion nozzle.

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