JPH0483546A - Spray nozzle - Google Patents

Abstract

PURPOSE:To realize effective atomization by providing a flow path changing the flow direction of the liquid from an introducing port to a right-angled direction and a revolving stream chamber to a nozzle body and fixing a jet orifice injecting a fluid to the nozzle body and also fixing a barrier plate to the nozzle body in opposed relation to the jet orifice. CONSTITUTION:The liquid stream flowing in from the introducing port 2 of a nozzle body 1 is changed in its flow direction to a right-angled direction in a flow path 3 to flow in a revolving stream chamber 4 and revolved by an annular peripheral wall surface 4a to become a vortex stream. The flow coefficient of the liquid of the liquid stream is lowered herein and the amount of the liquid stream flowing from a jet orifice 5 to the nozzle body 1 is also reduced and, even when the jet orifice 5 has a relatively large diameter, the liquid stream impinges against a barrier plate 7 in a flow rate suitable for fine pulverization to be discharged in a sufficiently atomized state. By this constitution, the diameter of the jet orifice can be increased and the clogging of the jet orifice is prevented and effective atomization can be realized for along period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a nozzle in which liquid can be sprayed at a wide angle.

This type of spray nozzle is effectively used in fire extinguishing equipment, particularly for cleaning electrode plates of electrostatic precipitators or extinguishing foam.

(Prior Art) Conventionally, various types of nozzles for spraying liquid have been proposed. For example, the shape of the ejection orifice of the nozzle is configured to enable spraying at a wide angle, but this configuration has the disadvantage that there is a large variation in the diameter of the droplets sprayed between the central area and the peripheral area of the spray pattern. There is.

In order to eliminate this drawback, as shown in FIG. A spray nozzle has been proposed which is fixed facing the ejection orifice 15 via the connecting arm 16. In this spray nozzle, the connecting arm 16 is interposed between the spray nozzle and the ejection orifice 5. The plate 17 is positioned, and the jet stream discharged from the jet orifice 15 hits the collision plate 17 and is atomized and sprayed.

(Problems to be Solved by the Invention) However, in the spray nozzle shown in FIG. Since the structure has a large flow coefficient, the ejection orifice 15
If the diameter of the jet orifice 15 is large, the flow rate will be too large and sufficient atomization will occur even if it hits the collision plate 17. On the other hand, if the diameter of the jet orifice 15 is made small, the water scale accumulated on the wall of the flow path 13 will cause the jet orifice to become atomized. 15 becomes clogged, rendering it unusable and complicating maintenance.

The present invention solves the above-mentioned problems and provides a spray nozzle in which the jet orifice does not become clogged and the liquid from the jet orifice hits the collision plate and is appropriately atomized to achieve effective atomization. The purpose is to provide.

(Means for Solving the Problems) According to the present invention, the above purpose is to
A nozzle body 1 is provided with a flow path 3 for changing the flow direction of the fluid from the inlet 2 to a right angle direction, and a swirling chamber 4 connected to the flow path 3. A jet orifice 5 for discharging the liquid is connected to the swirl chamber 4 and fixed to the nozzle body 1,
This is achieved by a spray nozzle in which a collision plate 7 is fixed to the nozzle body 1 via a connecting arm 6 so as to face the jet orifice 5.

(Function) In the spray nozzle according to the present invention configured as described above, in particular, the liquid flowing into the swirling chamber 4 swirls in the swirling chamber 4 and then is discharged from the jet orifice 5. , the flow coefficient of the liquid in the swirling chamber 4 can be reduced, and accordingly, even if the jet orifice 5 has a large diameter, the jet flow from the jet orifice 5 can be made small, and the collision and atomization in the collision plate 7 can be made smooth at all times. This can be achieved.

(Embodiment) Referring to FIGS. 1 and 2, the jet nozzle according to the present invention includes a nozzle body 1 through which fluid can flow, and the nozzle body 1 is provided with an inlet 2. A flow path 3 is formed in which the flow direction from the introduction port 2 is changed to a perpendicular direction. Further, a swirling chamber 4 is connected to the flow path 3 so as to be located in a direction perpendicular to the flow direction of the liquid from the inlet 2.

The swirling chamber 4 is provided as a cylindrical dome-shaped empty chamber,
In this swirling chamber 4, a wall surface located perpendicular to the flow direction of the fluid from the flow path 3 is an annular peripheral wall surface 4a. As a result, the liquid flow flowing into the swirling chamber 4 from the flow path 3 swirls along the annular peripheral wall surface 4a and becomes a vortex flow, thereby reducing the flow coefficient. A jet orifice 5 having a conical surface whose area gradually decreases is connected to the swirling chamber 4.

The jet orifice 5 is fixed to the nozzle body 1 so as to be located at a position perpendicular to the direction of inflow of liquid from the flow path 3 into the swirl chamber 4 .

Further, a collision plate 7 is fixedly attached to the nozzle body 1 via a connecting arm 6. The collision plate 7 is a flat disk, and is opposed to the jet orifice 5 at a distance from the jet orifice 5. The ejected liquid streams collide and are smoothly and sufficiently atomized.

In the above-described spray nozzle according to the present invention, the liquid flow flowing in from the inlet 2 of the nozzle body 1 is changed in flow direction at right angles in the flow path 3 and flows into the swirling chamber 4, forming an annular circumference. It swirls around the wall surface 4a and becomes a vortex. Here, the flow coefficient is reduced, and accordingly, the flow rate of liquid flowing out from the jet orifice 5 to the outside of the nozzle body I is also reduced, and even if the jet orifice 5 has a relatively large diameter, it collides with a flow rate suitable for miniaturization. It hits the plate 7 and is sufficiently atomized and released.

In this case, the spray nozzle according to the present invention and the conventional spray nozzle shown in FIG. A comparative test showed that the flow coefficient of the conventional spray nozzle was 0.97, whereas the flow coefficient of the spray nozzle according to the present invention was reduced to 0°39, and as a result, the diameter of the ejection orifice was lower than that of the conventional spray nozzle. It has been found that while the spray nozzle of the present invention needs to be narrowed down to five diameters, the spray nozzle of the present invention only needs to have a diameter of 9.5 square meters, which is approximately twice the diameter.

(Effects of the Invention) According to the spray nozzle of the present invention configured as described above, the fluidity coefficient can be lowered by causing the liquid to flow into the swirling chamber and creating a vortex flow, and the jetting flow rate can be reduced. To achieve effective effects such as increasing the diameter of the orifice, preventing clogging of the ejection orifice, and realizing effective atomization for a long period of time.

[Brief explanation of drawings]

FIG. 1 is a side view showing a part of a spray nozzle according to the present invention in cross section, FIG. 2 is a front view thereof, and FIG. 3 is a side view showing a part of a conventional spray nozzle in cross section. DESCRIPTION OF SYMBOLS 1... Nozzle body, 2... Inlet, 3... Flow path, 4... Swirling chamber, 4a... Annular surrounding wall surface, 5...
Ejection orifice, 6... connecting arm, 7... collision plate.

Claims (3)

[Claims] (1) A nozzle body that has an inlet for liquid to flow in and is provided inside so that the liquid can flow, has a flow path that changes the flow direction of the liquid from the inlet to a perpendicular direction, and a swirl connected to this flow path. A spray comprising a flow chamber, an ejection orifice for discharging the liquid, connected to the swirl chamber, and fixed to the nozzle body, and a collision plate fixed to the nozzle body so as to face the ejection orifice via a connecting arm. Nozzle for. (2) The ejection orifice is disposed at a position perpendicular to the direction of inflow into the swirling chamber from the flow path which changes the flow direction of the liquid perpendicularly to the swirling chamber. The spray nozzle described. (3) The spray nozzle according to claim 1, wherein the collision plate is a flat disk.