JPH0130540B2 - - Google Patents

Abstract

A blowing nozzle for connection to a blowing tool to deliver a pressurized, gaseous fluid. The nozzle comprises a plurality of fluid passages (14) which end in the form of blowing openings (16) in a shell surface (7a) which becomes narrower at the front on the nozzle. The area of the blowing openings (16) exceeds by at least 10 percent, preferably at least 15 percent, the cross-sectional area of the passages (14) close to the blowing openings (16).

Description

Technical Field This invention is a blowing nozzle for a blowing device, which includes a first end portion that can introduce a gaseous pressurized fluid from the blowing device, and a first end portion that can introduce a pressurized gaseous fluid from the blowing device, and a and a second end having an air outlet capable of discharging the pressurized fluid like an air stream, and directing the flow of the fluid flowing out from the corresponding air outlet to a desired target. The place where the direction is given so that the person is directed towards the
The invention relates to a blow nozzle with at least two or more passages. The above fluids in such nozzles include not only continuous flow but also
Pulsatile flow can be applied.

The above-mentioned nozzles are generally used by being attached to various types of blowing devices. As an example of their use, it is known to clean the workpiece during rounding or milling, for example by blowing air or other gas against the workpiece. In addition, such nozzles are used to apply external forces to, dry, heat, or cool various parts of automatic machines.

Background Art In known blower nozzles and blowers,
During use, a level of noise is generated which is not only unpleasant to the ears, but also very annoying on all occasions. In order to reduce the level of such noise, in the past, it was necessary to change the design of various parts of the blower device or the nozzle itself, or to change the nozzle to a multi-hole type, that is, to have multiple ventilation ports. An attempt is being made to do so.

DISCLOSURE OF THE INVENTION The present invention provides a multi-hole nozzle with at least two or more air outlets, which generates noise at a sufficiently lower level than conventional nozzles. It is an object. Such an object is based on the configuration of the present invention to make the opening area of the above-mentioned air outlet at least larger than the minimum cross-sectional area of the above-mentioned passage just before the opening.
This can be achieved by increasing it by 10%, preferably 15%.

[Brief explanation of drawings]

The invention will now be described in detail with reference to the accompanying drawings, which illustrate preferred embodiments thereof. In the figure, Fig. 1 is a cross-sectional view of the nozzle, with some side parts left open and the rest cut away in the length direction;
The figure is a front view of the nozzle as seen from the front.

BEST MODE FOR CARRYING OUT THE INVENTION In the drawings, 1 designates a blower nozzle with a nozzle body 2, preferably made of metal, which can be fixed by means of suitable connection means to a blower device 3 or to a blower tool, indicated by broken lines. is expressed comprehensively. The above-mentioned blower device 3 is not described in detail because it is not a main component of the present invention.

The nozzle body 2 is tapered toward the front, is symmetrical about the axis 5, and has a rear end portion 4 having an outer circumferential surface 4a with an inclination angle α. The rear end portion 4 is further tapered forward from the point indicated by 6, and its outer circumferential surface 7a is aligned with the axis 5.
Intermediate portions 7 which are symmetrical with respect to each other and have an inclination angle of β are connected.

The above angle of inclination: α is preferably up to 15°, but can be as large as 0° if the outer circumferential surface 4a and the axis 5 are made parallel.

In the illustrated embodiment, another tilt angle: β is approximately
It's becoming 20 degrees. However, it is also possible to change this as described below, and one of the inclination angles: α may be the same or may have a different value.

A circular nose portion 8 extends from the front end of the intermediate portion 7.

Inside the nozzle body 2, there is a cylindrical inner hole 9 and another inner hole 10 that is continuous with this inner hole and tapers toward the front. The latter inner hole 10 is preferably provided parallel to the outer circumferential surface 7a.

In its front end position, the inner bore 10 terminates at the inlet end of another cylindrical inner bore 11 having an inclined inner bore 12 . The inner bore 10 or the inner bore 9 configured in this way cooperates with each other to supply a gaseous pressurized fluid with a pressure of more than 4 bar, preferably up to about 8 bar, from the above-mentioned blower device 3 or blower tool. Chamber 13 for the introduction of
is formed. Moreover, the inner hole 11 and the inner hole 12 are
Although not shown, it provides support means for a valve incorporated in the blower device, which is adapted to regulate the flow of the fluid therethrough. However, in the absence of such support means, these bores 11 or 12 are unnecessary and, if provided, would generate a high level of noise.

Duct 1 provided so as to be continuous with chamber 13
The multiple fluid passages in the form 4 have a circular cross-sectional diameter D of less than 3 mm ² and are open to the atmosphere surrounding the nozzle. The axis of this duct or passage 14 and the axis 5 of the nozzle 1 are parallel to each other.

The entrance of the passage 14, that is, the introduction port 15, is
While the inner hole 10 is opened on the wall surface, its outlet, that is, the air outlet 16 is opened on the outer circumferential surface 7a of the intermediate portion 7. As a result, the inclination angle of the inlet 15 and the air outlet 16 with respect to the axis of the duct or passage 14 is β, and as a result, the openings of the inlet and the air outlet have a long axis of D/sin β. form a circle. Accordingly,
The opening areas of the inlet 15 and the air outlet 16 are larger than that of the passage. According to experiments, air outlet 1
The relationship between the opening area of 6 and the cross-sectional area of the passage 14 is as follows:
It has been found that the nozzle has a distinct influence on the level of noise generated. A similar characteristic (noise generation) also occurs when the opening area of the air outlet 15 is somewhat smaller than the cross-sectional area of the passage 14.

In order to significantly reduce the level of noise generated from the nozzle, it is necessary to reduce the inclination angle β to approximately 60° to 65° or less. However, that angle
If the angle exceeds 65°, certain noises will be reduced. Regarding such an angle β, its value is 60° or
If the angle is 65 degrees, the opening area of the air outlet 16 will be the same as that of the passage 1.
This results in an increase of about 15% or 10%, respectively, from the cross-sectional area of No. 4. In the illustrated embodiment, β
is approximately 20°, and therefore the area of each air outlet 16 is approximately 200% larger than that of the passage 14.

Air outlet 16 relative to the cross-sectional area of the passage 14 described above
The same relationship can be obtained when each passageway 14 is inclined with respect to the axis 5 to extend them inwardly or outwardly with respect to the fluid flow. For example, if the passage 14 is inclined outwardly by γ° with respect to the axis 5, the inclination angle β between the outer peripheral surface 7a and the axis 5 will be 60-γ° or 65-γ°. Therefore, the opening area of the air outlet 16 increases by 15 to 10%.

The above angles are: γ should not exceed 20°, preferably up to 15° or 10°.

When the flow of pressurized fluid flowing out from the air outlet 16 is to be effectively applied to the object to be treated, it is preferable that the passages 14, especially the portions near each air outlet, extend parallel to each other. or at a specific point in front of the nozzle by means of these passages.
The path must be set up so that it can cover a certain area of the object. Also, if the object is fairly small, it will necessarily be necessary to divert the path somewhat outwards. However, it is desirable that each of the embodiments described above be capable of directing fluid flow to an object within the assembly.

17 indicates a radially extending flange formed between the air outlets 16. This flange is
It extends gradually from the rear end portion 4 of the body 2 to just before the air outlet 16, and has a circular portion 18 at its tip. In addition, the above inclination angle: α is
0°, such a flange 1
7 is preferably provided to have a constant height. The height of the flange in front of the air outlet 16 is indicated by H in the figure, but it is best to make it larger than the diameter of the passage 14: D so that it has a value of D/sin β. This is desirable. According to the above-mentioned flange, various forms of the air outlet 16 can be protected from being damaged by a collision. This damage, if left untreated, can cause an increase in the noise level. Therefore, in the case where the above-mentioned flange is provided, it is possible to maintain the initially low level of noise. Another benefit of the flange 17 is that it protects the operator's hands from injury when setting up the blower.

The flange 17 is usually made of metal material, but can also be made of plastic, rubber, or similar materials.

In the drawing, eight air outlets 16 are provided for the nozzle.
However, the number can be increased or decreased, or it can be provided at the center of the nose portion 8 as desired. In this case, if no measures are taken with respect to such central vents, there will be some increase in noise level. However, in certain situations, especially when it is necessary to concentrate the fluid more strongly around the axis of the nozzle, by implementing one or more central passages,
You can expect practical results.

The nose portion 8 described above can also be flat instead of being circular. In such a construction, each air outlet 16 may be located along the flat nose portion of the nozzle or along its edge, with a portion extending along the outer circumferential surface 7a of the nozzle.
Alternatively, the opening may extend over the outer periphery of the flat nose portion. Their individual vents 16
may be provided entirely on the outer circumferential surface of the intermediate portion in another nozzle having one flat nose portion.

In the blow nozzle of the present invention, it is not necessary that the passage 14 or the duct be linear. That is, in the production of these passages, a plurality of passage sections or duct sections of various shapes angled with respect to each other, preferably the air outlet 16
It is possible to apply a part located in the immediate vicinity of the nozzle and which extends substantially parallel to the axis 5 of the nozzle, or it can be formed in a spiral shape. The passage may also have a varying cross-sectional area along the axial direction. Under such conditions, the cross-sectional area in the passage 14 immediately before the air outlet 16 when viewed in the fluid flow direction is the effective cross-sectional area of the air outlet,
Similarly, the cross-sectional area in the passage 14 immediately after the inlet 15 is the effective cross-sectional area of the inlet.

Although the above-mentioned passage 14 has a circular cross section in the drawing, the minimum cross-sectional area is 2 mm in diameter.
The shape may be changed to other shapes within the range not exceeding the above.

As explained above, according to the present invention, the air outlet 16 is formed by the second end of the passage 14,
The opening area of the air outlet 16 is at least 10% smaller than the minimum cross-sectional area of the passage 14 immediately before it, or at least
15% larger. This can significantly reduce fluid noise.

Furthermore, according to the invention, at least the passage 1
At the second end 16 of 4, the passageway 14 extends substantially parallel to the central axis 5 of the noise 1. As a result, when the fluid is discharged from the air outlet 16, the fluid forms a streamline flow and no turbulence occurs. Therefore, noise can be effectively reduced.

Furthermore, according to the invention, one or more projections 17 for the air outlet 16 protrude from the outer circumferential surface 7a of the nozzle 1. Therefore, protrusion 1
7 forms a partition wall by which the fluid in the air outlet 16 can be guided. Therefore, the fluid discharged from the air outlet does not interfere with the air in the vicinity of the air outlet 16, and noise can be reliably reduced.

Claims (1)

Claims: 1. At least two or more passages 14 are provided, each passage having a first end 15 to which a gaseous pressurized fluid is supplied from the blower 3, and a nozzle for supplying the pressurized fluid. 1 and a second end consisting of an air outlet 16 discharging into the surrounding atmosphere of the air outlet 1, and the direction of the at least two flow paths can guide the flow of fluid emitted from the air outlet 16 to the target object. A blower nozzle 1 for a blower device 3 selected as such, wherein the opening area of the air outlet 16 is at least 10% or at least 15% larger than the minimum cross-sectional area of the passage 14 immediately before it, A blowing nozzle characterized in that, at the second end 16, the passage 14 extends substantially parallel to the central axis 5 of the nozzle 1. 2. The air blowing nozzle according to claim 1, wherein the air blowing port 16 is provided on the outer peripheral surface 7a of the nozzle 1 making an acute angle β with respect to the central axis 5 of the nozzle 1. 3. A blow nozzle according to claim 1 or 2, characterized in that each passageway (14) has a minimum cross-sectional area of less than 2 mm. 4. The blow nozzle according to claim 2 or 3, wherein the outer peripheral surface 7 has a tapered shape. 5. The blow nozzle according to any one of claims 1 to 4, wherein the passage 14 is elongated. 6. The blow nozzle according to any one of claims 1 to 5, wherein the passages are constant over their entire length and have the same cross-sectional area. 7. The first end 15 of said passageway 14 forms an inlet, the area of which is at least 10% or at least 15% smaller than the smallest cross-sectional area of said passageway 14 immediately thereafter.
Claims 1 to 2 are characterized in that they are large.
The blow nozzle according to any one of Item 6. 8 At least two or more passages 14 are provided, each passage having a first end 15 to which a gaseous pressurized fluid is supplied from the blower 3, and a first end 15 for supplying the pressurized fluid to the atmosphere surrounding the nozzle 1. a second end consisting of an air outlet 16 for discharging air; the directions of the at least two flow paths are selected such that the flow of fluid emitted from the air outlet 16 can be guided to a target object; An air blowing nozzle 1 for a device 3, wherein the opening area of the air opening 16 is at least 10% or at least 15% larger than the smallest cross-sectional area of the passage 14 immediately before it, at least at the second end 16, A blowing nozzle characterized in that said passage 14 extends substantially parallel to the central axis 5 of said nozzle 1 and that one or more projections 17 for said blowing opening protrude from said outer circumferential surface 7a. . 9 Each of the protrusions 17 is made of an elongated wing-shaped member, and the protrusions 1 are perpendicular to the outer peripheral surface 7a.
9. The air blowing nozzle according to claim 8, wherein a height H of the air blowing nozzle is larger than a diameter D of the air blowing port.