JPH0318503B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spray nozzle, and more particularly to a spray nozzle that sprays fluid in a hollow cone manner. In this spray nozzle, pressurized fluid is introduced tangentially into a cylindrical vortex chamber and performs a high-speed vortex motion. As a result, the fluid discharged from the discharge orifice due to centrifugal force forms a spray in the form of a hollow cone. .

In this type of spray nozzle, the swirling motion of the fluid creates a long air core in the spray that reaches the bottom wall of the swirl chamber, but the ends of this air core or the swirling motion itself causes significant wear on the nozzle body. In some cases, there was a fear that a hole would form in the bottom of the nozzle body in a short period of time. Therefore, various configurations of vortex chambers have been proposed in order to minimize the wear due to the air core in this type of spray nozzle, but conventional vortex chamber configurations are difficult to achieve due to the well-known processes such as plastic injection molding or metal machining. It was not possible to easily manufacture a spray nozzle using this technology, and it was also not possible to fully achieve the effective spray effect of the spray nozzle.

On the other hand, in order to prevent wear of the spray nozzle and to achieve uniform distribution, for example when spraying in the form of a hollow cone, it is preferable to arrange the inflow section and the vortex chamber so that the air core is aligned with the central axis of the discharge orifice section. must be configured. When fluid is introduced tangentially into the vortex chamber, unbalanced forces tend to occur, and there is a risk that the air core, particularly the lower part, may be displaced from the axis of the discharge orifice within the vortex chamber, resulting in non-uniform spraying. Furthermore, even slight variations in the flow direction of the fluid at the inflow section or the bottom wall of the vortex chamber will cause the position of the air core to become unstable, resulting in non-uniform spray. Various configurations have been used to align the air core with the central axis in the vortex chamber, but some of them, as mentioned above, are not easy to manufacture, are expensive, cannot easily change the discharge volume, and still remain difficult to manufacture. It had the disadvantage of causing excessive wear and was impractical.

Therefore, the first object of the present invention is to provide a simple and economical spray nozzle that can appropriately set the position of the core so as to minimize wear caused by the core and achieve uniform spraying. be.

Another object of the present invention is to provide a spray nozzle that can produce large quantities.

A further object of the invention is to provide a spray nozzle which can have inlet passages of various sizes and which can achieve an effective spraying action even when the volume of the vortex chamber is varied.

Other objects and advantages of the invention will become apparent from the following description of an embodiment shown in the drawings.

The present invention will be described below with reference to embodiments shown in the accompanying drawings.

1 to 3, a spray nozzle 10 according to the invention has a cylindrical swirl chamber 12 and an inlet channel 1.
4, said inlet channel 14 extending perpendicularly, i.e. tangentially, to said cylindrical vortex chamber 12. Further, the inlet passage 14 is suitably communicated with the lower part of the cylindrical vortex chamber 12 at a position slightly above the bottom wall 13 of the cylindrical vortex chamber 12 . In addition, the nozzle body 11 is provided with an introduction reading part 15 extending on one side thereof, and the introduction reading part 15 is provided with an internal threaded hole part 16, and a thread provided at the end of the water supply pipe 18 is provided. The water supply pipe 18 is connected to the nozzle body 11 by screwing with the nozzle body 11 . The nozzle body 11 also has a discharge end 19 into which a thread at the end of an orifice cap 20 is threaded, while said orifice cap 20 is provided with a discharge orifice portion 21 communicating coaxially with the vortex chamber 12. The orifice cap 20
Ribs 22 and the like are provided on the outer periphery of the orifice cap 20 and the main body 11 so as to facilitate attachment and detachment of the orifice cap 20 and the main body 11, which are spaced apart in the circumferential direction.

Furthermore, the discharge orifice section 21 of the orifice cap 20 of the present invention has an internal orifice taper section 21a.
The internal orifice stave section 21
A extends upward from the vortex chamber 12, and is connected with an orifice cylindrical portion 21b having a relatively small width and diameter. Further, an external orifice taper portion 21c is formed on the upper surface of the orifice cap 20, and is located on the outer periphery of the orifice cylindrical portion 21b. On the other hand, for this type of spray nozzle,
It is preferable that the shape of the discharge orifice portion 21 is changed as appropriate depending on the water discharge angle and water discharge mode,
In the embodiment of the present invention, the orifice cap 20 is screwed onto the nozzle body 11, so that the orifice caps 20 having different shapes of discharge orifices can be attached and detached.

The pressure fluid introduced into the water supply pipe 18 is further introduced into the vortex chamber 12 via the inflow path 14, producing a steep vortex motion. As the fluid continues to be introduced from the water supply pipe 18 into the vortex chamber 12, the center of the fluid forming a vortex in the vortex chamber 12 becomes an air core and becomes a rotating flow at a considerable speed, causing an orifice as shown in FIG. It is discharged outwardly via the discharge orifice 21 of the cap 20 as a relatively thin layer of spray 25 in the form of a hollow cone. In this case, the air core in the spray 25 in the form of a hollow cone extends into the vortex chamber 12 via the discharge orifice 21 and reaches the bottommost part 25a. In this type of conventional spray nozzle, the axis of rotation of the fluid, that is, the air core, changes with respect to the axes of the vortex chamber 12 and the discharge orifice section 21, so there is a good correlation between the amount of spray and the uniformity of the discharge direction. For example, as the amount of spray decreases, the uniformity deteriorates.

In the present invention, a vortex chamber column is provided in the nozzle body, and the vortex chamber column extends in the axial direction upward from the bottom of the vortex chamber, and preferably guides the fluid introduced into the vortex chamber in the tangential direction. It works like this. In addition, a recess is provided at the upper end of the vortex chamber column, which allows the air core position of the vortex to be formed on the center axis of the vortex chamber, and also minimizes the wear of the vortex chamber column due to the generation of the air core. It can be held down. Further, in detail according to the embodiment shown in the drawings, the nozzle body 11 is provided with an upright column 28 forming a vortex chamber column, and the upright column 28 is introduced into the vortex chamber 12 as shown in FIG. The bottom wall 1 of the vortex chamber is arranged so as to be adjacent to one side of the inflow path 14 for the fluid to be mixed and to be at the same height as the upper surface 14a of the inflow path 14.
3. It is installed directly in the protrusion. In addition, the upright pillar 28
has a diameter approximately one-half the diameter of the vortex chamber 12, while the inlet passage 14 has a diameter slightly less than one-half the diameter of the vortex chamber 12. In this case, the diameter of the inflow channel 14 may be enlarged to one half of the vortex chamber. As a result, the pressure fluid introduced into the vortex chamber 12 via the inlet channel 14 flows around the upright column 28, in other words, the upright column 28 can guide the fluid flow in a suitable manner. (See Figure 3).

Further, a recess 29 is provided at the upper end of the upright column 28, and the recess 29 functions to align the air core formed in the vortex fluid with the center axis of the vortex chamber 12, thereby preventing the spray from being emitted. It can act to increase uniformity. Further, by providing the recess 29, wear of the upright column 28 caused by the air core generated in the nozzle body 11 can be suppressed to a minimum. The recess 29 has a concave spherical surface, and has an annular outer peripheral end 29 located concentrically with the discharge orifice 21.
a is formed. Note that even when the recess is formed into another shape, it is preferable that the recess is provided with a continuously curved outer peripheral end 29a.
9 prevents the destruction of the vortex and the generation of turbulence, allowing the air core to be smoothly formed with the bottom portion 25a as the end.

It has been found that when using the spray nozzle 10 according to the present invention, the upright post 28 is not subject to significant wear due to the air core and that the air core is preferably maintained along the central axis of the vortex chamber. The spray nozzle can also be applied to a variety of spray nozzles of different capacities without compromising the wear resistance of the upright column or the uniformity of the spray from the discharge orifice. That is, if the characteristic configuration according to the present invention is provided without changing the configuration of the spray nozzle described above, the inflow passage 14
Additionally, the dimensions of the orifice cap 20 can be changed as appropriate. Also, the inlet passage 14 is connected to the spray nozzle 10.
If an upright column 28 is provided at approximately the same height as the upper surface 14a or slightly higher than the top surface 14a, even if the inflow passage 14 has a large diameter to increase the spray amount, or the spray amount can be increased. Effective spray action can be achieved with a single spray nozzle even if the diameter is small.

It will be appreciated that spray nozzles having a variety of sizes or capacities can be constructed simply by changing the inlet passage, which is economical and highly productive. Furthermore, the spray nozzle according to the present invention can be economically mass-produced using well-known techniques. On the other hand, while the embodiments of the invention described above show a nozzle body 11 in which the upright post 28 may be integrally formed by injection molding plastic, the nozzle body 11 may be machined from other materials or from a metal casting. It is also possible to finish with. In addition, although the upright column 28 is provided so as to form a part of the nozzle body 11, it can be configured to be detachable as required, and can be attached to the nozzle body 11 by screwing or the like.

As is clear from the above, the spray nozzle of the present invention is extremely easy to manufacture, is highly economical, prevents wear caused by the air core, allows the position of the air core to be set effectively, and allows the inflow amount to be varied. It is possible to achieve effects such as:

[Brief explanation of the drawing]

FIG. 1 is a plan view of a spray nozzle according to the present invention, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is a horizontal sectional view thereof. DESCRIPTION OF SYMBOLS 10... Spray nozzle, 11... Nozzle main body, 12... Vortex chamber, 13... Bottom wall, 14... Inflow channel, 14a... Upper surface, 15... Introductory connection part, 1
6... Internal threaded hole, 18... Water supply pipe, 19... Discharge end, 20... Orifice cap, 21...
Release orifice part, 21a... Internal orifice taper part, 21b... Orifice cylindrical part, 21c...
... External orifice taper part, 22 ... Rib, 25
... spray, 25a ... bottom, 28 ... upright column, 29 ... recess, 29a ... outer peripheral end.

Claims (1)

[Scope of Claims] 1. A nozzle body comprising a vortex chamber having an annular side wall and a bottom wall, and having an inlet passage for introducing fluid into the vortex chamber from a substantially tangential direction, and an upper end of the vortex chamber. a device having a discharge orifice section closed and located coaxially with the vortex chamber, and a pressurized fluid introduced from the inflow path guided along an annular side wall of the vortex chamber to form a vortex flow in a predetermined direction. The air core of the vortex extends upward from the bottom wall of the vortex chamber to maintain the position of the air core and the axis of the vortex fluid, and to prevent the nozzle body from being worn out by the air core and the vortex. A spray nozzle producing a fluid spray in the form of a hollow cone with an air core in the center, comprising a vortex chamber column having a lower end and an upper end having an aligned recess. 2. The spray nozzle according to claim 1, wherein the swirl chamber column is provided integrally with the nozzle body and has a diameter substantially half that of the swirl chamber. 3. The spray nozzle according to claim 2, wherein the vortex chamber column is located at the center of the vortex chamber. 4. The spray nozzle according to claim 3, wherein the recess at the upper end of the vortex chamber column is positioned coaxially with the vortex chamber and the discharge orifice. 5. The spray nozzle according to claim 1, wherein the vortex chamber column has a concave portion having a spherical surface. 6. The spray nozzle according to claim 1, wherein a concave portion having a spherical surface provides an annular continuous outer peripheral end portion on the upper surface of the vortex chamber column. 7. The spray nozzle according to claim 6, wherein the concave portion of the vortex chamber column provides an annular continuous outer peripheral end portion on the upper surface of the vortex chamber column. 8. The spray nozzle according to claim 1, wherein the vortex chamber column projects upward to substantially the same height as the upper surface of the inlet channel. 9. The spray nozzle according to claim 7, wherein the vortex chamber column projects slightly above the upper surface of the inlet channel. 10. The spray nozzle according to claim 8, wherein the vortex chamber column projects slightly below the upper surface of the inlet channel.