JP2500555Y2 - Fluid jet - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid injection pipe whose outlet opening area can be changed, and more particularly to a structure in which the outlet opening area of the blower working machine is variable.

2. Description of the Related Art Fluid jets, especially jets of blower working machines such as chemical sprayers and wind sweepers, require a relatively large amount of jets depending on the conditions of use and the place of use. There is a case where a discharge jet having a certain amount is required, and thus there is a demand for a jet tube configured to easily obtain a discharge jet having a different air volume and different air pressure during use. However, the conventional injection pipe cannot change the outlet opening area and is constant, and is configured to adjust the output of the prime mover to obtain a discharge jet having various air volumes and pressures from the blower. Therefore, increasing the air pressure will increase the amount of wasted air,
Further, there is a problem that noise is increased to increase the output of the prime mover.

DISCLOSURE OF THE INVENTION Therefore, the present invention eliminates the disadvantages of the prior art as described above, and can adjust the air volume and the air pressure of the discharge jet substantially steplessly with a relatively simple structure. It is an object of the present invention to provide an injection pipe that realizes the suppression of high noise generation.

Means for Solving the Problems According to the present invention, a fluid jet tube for ejecting a fluid jet is provided with a plurality of axially forward outlet beak members facing each other at an outlet end portion of the jet tube. And at least one outlet beak member is pivotally fixed to the outlet end so as to be able to pivot relative to each other, and a spring is interposed between the plurality of outlet beak members to provide spring force. The outlet beak member is biased away from each other, and one end of the control member is locked to an intermediate portion of the spring to open / close the outlet beak member.

Therefore, the plurality of outlet beak members are pivoted by operating the control member against the spring force of the spring, thereby adjusting the outlet opening area of the injection pipe and adjusting the air volume of the jet flow discharged from the injection pipe. It is possible to adjust the wind pressure as needed.

Embodiment Next, the present invention will be described based on an embodiment of the drawings.

The jet 1 of the illustrated embodiment is particularly suitable for use as a jet of a wind scrubber and has a relatively long length and is formed in a shape with a substantially cylindrical cross-sectional area.
The jet pipe 1 has side surface portions on both sides close to the outlet end portion 2 (only one of the side surface portions is shown by reference numeral 3 in FIGS. 1 and 2) and is substantially parallel to each other in the vertical direction when viewed in FIG. It is formed in an extending plane. Pins 4 and 5 spaced apart from each other in the vertical direction are fixed to each of the side surface portions 3, and the pair of left and right upper pins 4 has a semi-cylindrical movable outlet beak member 6 whose lower side is open. In the vertical direction, the pair of left and right lower pins 5 support a semi-cylindrical movable outlet beak member 7 whose upper side is open so as to be vertically movable in both side portions. There is. The upper and lower movable outlet beak members 6 and 7 are arranged so as to be in contact with the outer peripheral surface of the injection pipe 1 and project forward from the outlet end 2 of the injection pipe 1 in the axial direction. Edges 8 on both lower sides of the upper movable outlet beak member 6 and the lower movable outlet beak member 7
Are formed so as to face each other with the edge portions 9 on both upper sides thereof, and the gap G between them is formed so as to extend on an obliquely inclined surface so that they are gradually separated toward the front in the axial direction. There is. It will be appreciated that in this way the upper and lower movable outlet beak members 6 and 7 are of the same shape and are arranged facing each other. Further, the outer peripheral surface of the outlet end 2 of the injection pipe 1 is a chamfered portion which is inclined inward in the radial direction.
10 is formed to facilitate pivoting of upper and lower movable outlet beak members 6 and 7, which will be described later.

The upper and lower movable outlet beak members 6 and 7 are rotatably supported by the respective pins 4 and 5 of the side surface portion 3 of the injection pipe 1, and the gear parts 11 and 12 integrally formed with each other mesh with each other. It is in a state. Therefore, these gear parts 11 and
When the upper movable outlet beak member 6 moves downward from the position shown in FIG. 1 to the position shown in FIG. 2, the lower movable outlet beak member 7 is moved from the position shown in FIG. 1 to the position shown in FIG. The upper and lower movable outlet beak members 6 and 7 simultaneously pivot in the upward direction, and act as an interlocking device for simultaneously pivoting in the opposite directions. When the upper and lower movable outlet beak members 6 and 7 are in the fully open position shown in FIG. 1, their tips 13 and 14 define a maximum jet outlet opening area which is approximately equal to the cross-sectional area of the outlet end 2 of the jet pipe 1. And the upper and lower movable outlet beak members 6 and 7 are second
When in the fully closed position shown, their edges 8 and 9 contact each other to define a minimum jet outlet opening area.

Further, a torsion spring 15 is arranged in the inner space of the upper and lower movable outlet beak members 6 and 7. The torsion spring 15 is, as shown in FIG. 3, an intermediate portion 16 wound in a coil shape with an appropriate number of turns, and a pair of arms extending from the intermediate portion 16 toward the upper and lower movable outlet beak members 6 and 7, respectively. With portions 17 and 18. The upper and lower movable outlet beak members 6 and 7 are provided with spring locking portions 19 and 20 on their inner surfaces near their tips 13 and 14.
Are integrally formed, and these spring locking portions 19
Reference numerals 20 and 20 pivotally lock the tips of the arm portions 17 and 18 of the torsion spring 15, respectively. With such a structure, the torsion spring 15 biases the upper and lower movable outlet beak members 6 and 7 away from each other by its spring force, and maintains them at the fully open position shown in FIG. 1, that is, the maximum jet outlet opening position. To act. At this time, the upper and lower movable outlet beak members 6 and 7 are in contact with the outer peripheral surface of the injection pipe 1 at their rear ends and are prevented from further pivoting in the opening direction.

An engaging member having a cylindrical shape as shown in FIG. 4 in the internal space of the coiled intermediate portion 16 of the torsion spring 15.
21 is inserted and arranged, and the engaging member 21 is provided on its peripheral surface.
As a control member, one end of a flexible cable 22 which is an inner cable of the Bowden cable is fixed. The cable 22 extends from the engagement member 21 into the interior of the injection tube 1 through the gap between adjacent turns of the intermediate portion 16 of the torsion spring 15.

Further, a wheel-shaped member 23 is arranged inside the injection pipe 1. The wheel member 23 is pressure-bonded to the inner peripheral surface of the injection pipe 1, and further, an inward projection 24 formed on the inner peripheral surface of the injection pipe 1.
Of the peripheral edge 25 fixedly attached to the inner peripheral surface of the injection pipe 1 by engaging with, the boss portion 27 having the axial screw hole 26 formed in the center, and the peripheral edge portion 25 and the boss portion 27. A plurality of spokes 28 extending in the radial direction between the bosses 27 and the spokes 28 are shaped and arranged so as not to substantially obstruct the air flow in the injection pipe 1.
The screw hole 26 of the boss portion 27 is screwed and fixed to the tip screw portion 30 of the outer cylinder 29 of the Bowden cable. The outer cylinder 29 is not shown in the drawing, but is cut from a wall at an appropriate position of the injection pipe 1. It is formed and arranged so as to project to the outside. The outer cylinder 29 guides and guides the flexible cable 22 to the outside of the injection pipe 1 through the inside thereof, and the outer end of the flexible cable 22 is an operating lever provided on a spray pipe holding grip (not shown). Is pivotally attached to.

With such a configuration, the operator operates the actuating lever during use to adjust the amount of pulling of the cable 22 so that the movable outlet beak members 6 and 7 are moved to the maximum jet outlet opening position of FIG. It is possible to obtain a jet flow with a desired air volume and pressure by pivoting between it and the minimum jet outlet opening position and holding it at a desired position, thereby maintaining the jet outlet opening area of the jet pipe 1 at a desired size. . In the illustrated embodiment, the spring force of the torsion spring 15 and the tensile force of the cable 22 act symmetrically and uniformly on both the upper and lower movable outlet beak members 6 and 7, so that the movable outlet beak No excessive force is applied to the members 6 and 7. It should be noted that the gear parts 11 and 12 can be provided only on one side surface portion 3, and instead of the gear parts 11 and 12, another mechanism such as a cam mechanism having a similar function can be provided.

Effect of the Invention Furthermore, various modifications are possible, such as one of the movable outlet beak members 6 and 7 being integrally molded with the outlet end 2 of the injection pipe 1 for simplification, or having two or more movable outlet beak members. Is.

With the configuration of the present invention described above, the present invention can easily adjust the jet outlet opening area of the injection pipe by operating the control member to pivot the outlet beak member, and thereby the desired air volume. Further, it is possible to provide a jet pipe that can obtain a jet jet of wind pressure, has a simple structure, is easy to handle, and can reduce the generation of noise to a minimum.

[Brief description of drawings]

FIG. 1 is a fragmentary side view of an essential part of a jet tube showing an embodiment according to the present invention, and FIG. 2 is a fragmentary side view of the essential part of the injector of FIG. 1 in another operating state, and FIG. FIG. 4 is a front view of a main part of a spring used in the embodiment of FIG. 1, and FIG. 4 is a perspective view of an end portion of a control member. DESCRIPTION OF SYMBOLS 1 ... Jet tube, 2 ... Exit end of jet tube, 6, 7 ... Exit beak member, 15
... Spring, 16 ... Middle part of spring, 22 ... Control member.

Claims (1)

(57) [Scope of utility model registration request] 1. A fluid jet pipe (1) for discharging a fluid jet, wherein a plurality of outlet beak members (6, 7) extending forward in the axial direction are directed to an outlet end portion (2) of the jet pipe. At least one outlet beak member is pivotally attached to the outlet end so that they can be aligned and pivoted relative to each other, and a spring (15) is interposed between the plurality of outlet beak members. And the spring force biases the outlet beak members away from each other, and one end of the control member (22) is locked to the intermediate portion (16) of the spring to open and close the outlet beak member. And a fluid jet tube.