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(11) | EP 0 438 599 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
| published in accordance with Art. 158(3) EPC |
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| (54) | NOZZLE FOR JETTING A SELF-VIBRATORY FLUID STREAM |
| (57) A nozzle for jetting self-vibratory fluid stream, which comprises a main nozzle for
forming a jet stream, side walls for producing eddies on the right and left rides
of the jet stream while preventing the stream from sticking thereto, and claw-like
portions contiguous to the side walls for dividing and dispersing the jet stream,
so as to adapt the jet stream to curve to cause self-vibration by means of alternately
generated eddies in the right of left space between the side wall and the jet stream
and pressure difference caused by absorptive effect arising from wake, and to disperse
the jet stream with the claw-like portions for spraying the fluid around widely, is
very useful as a jet nozzle for the water spraying device and cleaning machine, Recognizing
the importance of the claw-like portions at the outlet port of the self-vibratory
fluid stream jetting nozzle as above, this invention provides a self-vibratory stream
jetting nozzle usable for a long term, in which the claw-like portion is rounded or
provided with a straight linear part rounded at the end thereof or the cross-section
of the output port is curved inwardly so that flowing efficiency is raised with flowing
loss reduced and variation in characteristics resulting from wear of the claw-like
portion may be prevented. |
TECHNICAL FIELD
[0001] This invention relates to a nozzle for jetting a self-vibratory fluid stream, and more particularly to a nozzle for jetting without moving parts a self-vibratory fluid stream, provided with a rounded portion or a straight linear part rounded at an output port or provided with a output port with an inwardly curved cross-section so that flowing efficiency is raised.
BACKGROUND ART
[0002] Conventional water spraying devices (including a jetting nozzle), include a device such as a watering can with a system for directly jetting water through a plurality of pores and a device such as a sprinkler or the like for spraying water with a system mechanically moving a jetting nozzle. Moreover, a water spraying device disclosed in Japanese Patent Publication No. 49-1916 and Japanese Patent Publication No. 50-6644 etc., has a system comprising a main nozzle for forming a jet stream in a jetting nozzle, side walls for producing eddies on the right and left sides of the jet stream, and claw-like portions contiguous to the side walls for dividing and dispersing the jet stream, so as to induce the jet stream to curve to create self-vibration by means of the difference in the right and left eddies generated between the side walls and the jet stream, and to disperse the jet stream with the claw-like portions for spraying the fluid over a wide range.
[0003] Of these conventional water spraying devices, the device such as a watering can with the system for directly jetting water through a plurality of pores,exhibits some defects that the pores are inclined to become plugged with dust and the trajectory of the jet stream is short because of a large flowing resistance or the like. In addition, the device such as a sprinkler with the system mechanically moving a jetting nozzle, shows some defects that mechanically moving parts are damaged and production costs are high because of the complicated structure or the like. Further, the water spraying device with a self-vibration system disclosed in Japanese Patent Publication No. 49-1916 and Japanese Patent Publication No. 50-6644 etc., exhibits some defects that an energy loss is largely produced by the impingement of the jet stream against the claw-like portions of the output port and the characteristics of the claw-like portion changed by wear or the like.
[0004] An object of the invention is to provide a jetting nozzle which can stably produce a high-frequency self-vibration by a jet stream from a main nozzle, and in which flowing loss is small and variation in characteristics resulting from wear is small.
DISCLOSURE OF INVENTION
[0005] A first invention of a self-vibratory fluid stream jetting nozzle according to the present invention is characterized in that a output port is provided with a claw-like portion rounded or provided with a straight linear part rounded so that flowing efficiency is raised with flowing loss reduced and variation in characteristics resulting from wear is prevented, and regarding a second invention, is characterized in that a cross-section of a output port is curved inwardly so that flowing efficiency is raised with flowing loss reduced and variation in characteristics resulting from wear is prevented in the same way as in the first invention. Here, characteristics are defined as the angle of the water spraying, the distribution of water spraying and the flowing characteristics or the like.
[0006] Thus, the self-vibratory stream jetting nozzle is a output port provided with a claw-like portion rounded or provided with a straight linear part rounded at the end thereof so that exfoliation and contraction are restrained, flowing loss is reduced and adhesive action is increased to increase the angle of water spraying, as compared with the output port of the conventional self-vibratory stream jetting nozzle having an acute claw-like portion and a straight linear part contiguous thereto. Moreover, a stable vibration can continue over a long period because variations resulting from wear are prevented.
[0007] In addition, the self-vibratory stream jetting nozzle is provided with a output port having a portions ranging from a claw-like portion to a straight linear part curved inwardly in the cross-section thereof so that the flowing loss can also be similarly reduced to increase the volume of flow. Furthermore, the two systems above are combined to provide an output port with claw-like portions rounded or provided with straight linear parts rounded and curved inwardly in cross-section so that the above effects are intensified.
BRIEF DESCRIPTION OF DRAWINGS
[0008] Fig. 1 is an exploded perspective view of an embodiment of the first invention according to a self-vibratory fluid stream jetting nozzle of the present invention, Fig. 2 is a front view of the assembled nozzle, Fig. 3 is an exploded perspective view of another embodiment of the first invention, Fig. 4 is a front view of the assembled nozzle, Fig. 5 (a), (b) are an assembled view and a sectional view taken along the line b-b' of the second invention.
BEST MODE FOR CARRYING OUT THE INVENTION
[0009] In order to describe the present invention in more detail, the embodiment will be described hereunder with reference to the accompanying drawings.
[0010] Fig. 1 is an exploded perspective view of an embodiment of the first invention, Fig. 2 is a front view of the assembled self-vibratory fluid stream jetting nozzle.
[0011] The device comprising, in combination; a plate C having a feeding port 1; a plate B comprising a main nozzle 2 for forming a jet stream connected to the feeding port 1, an air chamber defined by right and left walls 3, 3' and connected with the main nozzle 2, an output port 5 provided with right and left claw-like portions 4, 4' rounded on a radius R and leading to the walls 3, 3'; and a plate A with air ports 6, 6'.
[0012] In addition, Fig. 3 is an exploded perspective view of another embodiment of the first invention, Fig. 4 is a front view of the assembled nozzle, wherein right and left claw-like portions 4, 4' are rounded on a radius R and straight linear ports 7, 7' respectively lead to the claw-like portions 4, 4', and end parts leading to the straight linear parts 7, 7' are respectively rounded on a radius R.
[0013] The self-vibratory action of these self-vibratory fluid stream jetting nozzles is similar to that of the devices disclosed in Japanese Patent Publication No. 49-1916 etc., and the output port 5 is a little wider than the spreading width of the jet stream and fluid provided from the feeding port 1 becomes a jet stream through the main nozzle 2 and an eddy is generated between the jet stream and the wall 3 or 3' contacting the jet stream. Air between the jet stream and the wall on the opposite side is removed by the jet stream to produce a pressure difference between the right and left sides of the jet stream so that the jet stream is resultingly bent to the right or left. By repeating this action, a stable self-vibration is continued. In this case, the claw-like portions 4, 4' are not acute, but rounded on a radius R so that flowing efficiency is raised with flowing loss reduced. In addition, when the claw-like portions are acute, the characteristics as the spray angle, the distribution of the water spraying and the flowing characteristics or the like are largely changed resulting from wear, but when the claw-like portions are initially rounded, the claw-like portions do not appreciably change from wear, therefore these characteristics are not significantly changed.
[0014] Fig. 5(a) is an assembled view of an embodiment of the second invention, and Fig. 5(b) is a sectional view taken along line b-b in Fig. 5(a). In this invention, the cross-sections of the portions from the claw-like portions 4, 4' to the straight liner parts 7, 7' at the outside thereof in the output port 5 are curved inwardly. In this case, the flowing efficiency is raised with flowing loss reduced and characteristics are not changed from wear.
[0015] Moreover, the first invention and the second invention may be combined to provide claw-like portions rounded and curved inwardly in cross-section so that these effects are even more outstanding.
[0016] Next, the results of an experiment comparing the conventional self-vibratory fluid stream jetting nozzle disclosed in Japanese Patent Publication No. 49-1916 etc. and the self-vibratory fluid stream jetting nozzle of the present invention are shown.
INDUSTRIAL APPLICABILITY
[0017] As described previously, the self-vibratory fluid stream jetting nozzle of the present invention achieves the following effects by providing the output port of the self-vibratory fluid stream jetting nozzle with the claw-like portions rounded or straight linear parts rounded at the end thereof and the output port curved inwardly in cross-section.
(1) Flowing efficiency is raised with flowing loss reduced.
(2) Variations in characteristics of the spray angle, the distribution of the water spraying and the characteristics of flowing or the like resulting from wear are prevented.
(3) When the claw-like portions are rounded and the cross-section of the output port is curved inwardly, the effects are even more pronounced.
1. A nozzle for jetting self-vibratory fluid stream, comprising spaces defined at the
right and the left of a main jet stream from a main nozzle, and of an output port
wider than a spreading width of the jet stream, so as to cause self-vibration by means
of alternately generated eddies in the right or left space and pressure difference
caused by the absorptive effect arising from the wake,
characterized in that the output port is provided with a rounded portion or a straight linear part rounded at the end thereof so as to reduce flowing loss in the jet stream to raise flowing efficiency and to prevent variation in characteristics resulting from wear.
characterized in that the output port is provided with a rounded portion or a straight linear part rounded at the end thereof so as to reduce flowing loss in the jet stream to raise flowing efficiency and to prevent variation in characteristics resulting from wear.
2. A nozzle for jetting self-vibratory fluid stream, comprising spaces defined at the
right and the left of a main jet stream from a main nozzle, and an output port wider
than a spreading width of the jet stream, so as to cause self-vibration by means of
alternately generated eddies in the right or left space and pressure difference caused
by the absorptive effect arising from the wake,
characterized in that the output port curves inwardly in cross-section so as to reduce flowing loss in the jet stream to raise flowing efficiency and to prevent variation in characteristics resulting from wear.
characterized in that the output port curves inwardly in cross-section so as to reduce flowing loss in the jet stream to raise flowing efficiency and to prevent variation in characteristics resulting from wear.