JPH02268851A - Fluid injection nozzle - Google Patents

Abstract

PURPOSE:To uniformly inject fluid sufficiently long in a longitudinal direction by providing a pair of notches so as to part and deviate equidistantly in opposite directions in parallel and providing a projection at the center of the blind inner peripheral surface between the notches. CONSTITUTION:Since discharge ports 3, 3 are provided with a pair of notches 2, 2 in parallel with the outer peripheral surface in the bottom side of a circular conical shape, the fluid injected therefrom is injected straight in parallel as it is on both end sides in the direction along an orthogonal plane S2. A pair of the notches 2, 2 in the central part bring the fluid injected in parallel into collision against a projection 4 at the center while deviating the fluid in the directions opposite to each other at the transverse center thereof and deviate and inject the fluid in the directions parting from an orthogonal plane S2 by being affected by the radially diffusing fluid. As a result, the fluid injection distribution compounded and combined with the fluids injected from discharge ports 3, 3 in the central part and the fluid injection distribution on both end sides in the orthogonal plane direction are uniformalized and the injection distribution uniform over the entire central part and both end sides is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid injection nozzle, and more specifically, the present invention relates to a fluid injection nozzle. In addition to forming a bottom inner circumferential surface, a pair of notches for forming a discharge port are provided on the bottom side of the nozzle body on both sides of a specific virtual central plane including the central axis of the bottomed inner circumferential surface. ,
The present invention relates to a fluid injection nozzle with separate perforations.

[Conventional technology]

For example, when injecting cooling fluid to cool steel products that are continuously cast on a continuous casting line in a steel mill, or when injecting cooling fluid to cool rolled steel sheets that are rolled on a hot rolling line, etc. , a flat spray type fluid ejection nozzle that ejects fluid flatly over a certain length is used.

When using such a fluid injection nozzle, the object to be cooled, such as cast steel or rolled steel plate, needs to be cooled uniformly in the width direction during the continuous feeding process. It is preferable that the fluid injected from the outlet be elongated in the width direction of the object to be cooled and that can uniformly distribute the fluid in that direction (hereinafter referred to as the longitudinal direction).

However, in a fluid ejection nozzle in which only one ejection port is provided in the center, it is generally not possible to obtain a uniform ejection distribution of the fluid in the longitudinal direction.

Therefore, at the inner bottom of the bottomed cylindrical nozzle body, a bottomed inner circumferential surface that is parallel to the center axis of the main body or almost parallel to the main body axis is formed, and
A pair of notches for forming a discharge port are separately bored on the bottom side of the nozzle body on both sides of a specific virtual central plane including the central axis of the bottomed inner circumferential surface. Possibly a nozzle.

However, when the pair of notches are provided on a straight line, there will be a portion in the center where the jetted fluids jetted from the pair of notches overlap each other, and if the degree of overlap increases, , the injection distribution will be such that the flow rate is larger in the central part than in other parts. Furthermore, if, for example, the distance between the pair of notches is increased in order to reduce the degree of misalignment, the injection distribution will be such that the flow rate is smaller in the center than in other parts, and eventually However, it is difficult to obtain a uniform injection distribution. Therefore, as shown in FIGS. 8 and 9, for example, a pair of branch passages (82
).

(82) are arranged in parallel, and a pair of left and right parallel planes (84), (84) symmetrically parallel to the central axis on both sides of the outer periphery of the nozzle body (81), and a pair of left and right parallel planes (84) that are continuous and inclined thereto. , and the parallel planes (84), (84) and the left and right inclined planes (83), (83) are orthogonal to the branch paths (82), (82). A pair of grooves (85), (85) having a V-shaped cross section are formed parallel to the direction in which the branch paths (82), (82) communicate with each other. There is a discharge port (86) at the tip of the
(86) and from there the first
As shown in Fig. 0, fan-shaped injections (AI) and (Ax) are performed, and the injections are overlapped at the center part (C) as shown in Fig. 10, making the whole nozzle symmetrical with respect to the solid axis of the nozzle body. There is a device that performs approximately uniform injection within a certain range (Utility Model Application No. 58-86265).

[Problem to be solved by the invention]

However, when fluid is ejected from the fluid ejection nozzle as described above, when observing the fluid ejection distribution in detail, as shown in FIG. (AI), (A2)
In the longitudinal direction (A2).

(13) and each fan injection (AI).

(A2) tends to spread in the width direction at both ends in the longitudinal direction. A pair of branch passages (82) and (82) are arranged in parallel in a cylindrical nozzle body (81), and parallel planes (84) are formed on both sides of the outer periphery of the nozzle body (81). , (84) and inclined plane (83) , (
Since the grooves (85) and (85) are formed in the branch passages (82) and (83), the discharge ports (86) are formed at the tip portions of the branch passages (82) and (82).

(86) directly opens to eject fluid directly, while the fluid discharged from the discharge ports (86), (86) at both ends in the longitudinal direction from the distal end portion is This is believed to be based on the fact that the fuel is diffused and deflected via the grooves (85) and (85). Therefore, when it is desired to jet the fluid sufficiently long in the longitudinal direction, the width (-) of the jet distribution as a whole of the fluid is the first
As shown in FIG. 1, there is a problem in that the size increases and the uniformity of the distribution in the longitudinal direction is sacrificed by the increase.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fluid ejection nozzle that can uniformly eject fluid for a sufficiently long length in the longitudinal direction.

[Means to solve the problem]

The fluid ejecting nozzle according to the present invention is a fluid ejecting nozzle with an extrusion configuration, in which the pair of notches are formed at the center of each width thereof.
the bottom-side outer peripheral surface of the nozzle body so as to be offset by equal lengths in parallel and opposite directions with respect to an orthogonal plane that includes the center axis of the bottomed inner peripheral surface and is perpendicular to the virtual central plane; Moreover, a protrusion is provided at the center of the bottomed inner circumferential surface between the pair of cutout portions toward the upper side of the fluid flow path.

[For production]

When such a fluid ejecting nozzle is used to eject fluid from the ejection port, the ejection port, that is, the ejection port provided by forming the pair of notches on the outer circumferential surface of the bottom side. are parallel to the orthogonal plane perpendicular to the virtual central plane, so the fluid injected therefrom is directed in the direction along the orthogonal plane (hereinafter referred to as
To give a specific example,
At both end sides (E) and (E) in FIG. 7, which shows a schematic plan view distribution of the jetted fluid, the fluid discharged from the discharge port is directly parallel to the orthogonal plane direction (left-right direction in FIG. 7). is injected in a straight line. Further, in the central part in the direction of the orthogonal plane, for example, in the central part (C) in FIG. Since the protrusions are provided so as to be offset by equal lengths in opposite directions and are provided at the center of the bottomed inner circumferential surface, the fluids are jetted in parallel from the discharge ports while being offset in opposite directions. is deflected and ejected in a direction away from the orthogonal plane due to the influence of the fluid that collides with the central protrusion and diffuses radially.

Therefore, the fluid discharged from the pair of discharge ports, respectively, is
Both end sides, for example, both end sides in FIG. 7 (
E) and (E), both are ejected linearly parallel to the orthogonal plane direction, while eccentrically deflected in opposite directions at the central part, for example, the central part (C) in FIG. 7. It is injected. As a result, a fluid ejection distribution in which the fluids from the respective discharge ports are combined in the central part (center part (C) in FIG. 7) and both ends in the orthogonal direction (both ends (E in FIG. 7)) are determined. , (E
) ) makes it possible to equalize the fluid jet distribution formed independently by the fluid from each discharge port, thereby creating a uniform jet distribution over the central portion and both end sides, and increasing the width of the jet distribution. You will be able to form it without having to do it.

〔Effect of the invention〕

Therefore, when injecting fluid using the fluid injection nozzle of the present invention, by setting the orthogonal plane direction to the width direction of the object to be cooled, the fluid can be uniformly injected for a sufficiently long length in the longitudinal direction. It becomes possible to uniformly cool the object to be cooled, and the conventional problems of concern will be solved.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In Figs. 1 to 4, (1) is the main body of a fluid injection nozzle for water cooling cast steel materials, rolled steel plates, etc., that is, a bottomed cylindrical nozzle main body, and the outer circumferential surface (1b) on the bottom side thereof is The nozzle body (1) has a conical shape and a bottom plane (1c) perpendicular to the central axis of the nozzle body (1) is formed at the tip of the bottom side outer peripheral surface (1b), that is, at the bottom of the nozzle body (1). Further, the inner bottom of the nozzle body (1) is formed with a bottomed inner circumferential surface (1a) that is circular or approximately circular with the central axis of the main body. A protrusion (4) is provided at the center of the bottomed inner circumferential surface (1a) toward the upper side of the fluid flow path.

Further, a discharge port (3) is provided on the bottom side of the nozzle body (1).
), (3) with notches (2), (
2) are separately bored in a pair on both sides of a specific virtual central plane (S1) including the central axis (P1) of the bottomed inner circumferential surface (1a), and the pair of notches (2), (2) is such that the center of each width thereof is the central axis (P
The conical bottom side outer circumferential surface (
1b) (more precisely, so as to extend over the neighboring outer circumferential surface which is not conical).

The fluid is sent to the discharge port (3) using such a fluid injection nozzle.
, (3), the discharge ports (3) and (3) are the pair of notches (2).

(2) are provided in parallel to the conical bottom side outer circumferential surface (1b) as shown in FIGS. 2 and 4, so that the fluid injected from there is As shown in FIG. 7, on both end sides in the direction along the orthogonal plane (S2) (hereinafter simply referred to as the orthogonal plane direction),
The fluid discharged from (3) is directly injected straight in parallel in the direction of the orthogonal plane. In addition, in the central part (C) in the orthogonal plane direction, the discharge ports (3), (3)
The pair of notches (2), (2) constituting a (
4), the discharge ports (3), (
3) are ejected in parallel while being deviated upward in opposite directions to each other, colliding with the central protrusion (4) and being influenced by the fluid diffusing radially as shown by the arrows in FIG. It is deflected and injected in a direction away from the orthogonal surface (S2) as shown in FIG.

Therefore, as shown in FIG. 7, the fluid discharged from the pair of discharge ports (3), (3),
) and (E), both are injected linearly in parallel to the orthogonal plane direction, while in the central part (C) they are injected while being eccentrically deflected in mutually opposite directions. As a result, the respective discharge ports (3) and (3
), and the fluid jet distribution at both end sides (E) and (E) in the orthogonal plane direction can be made uniform (as indicated by the thick line in Fig. 6). ), with the central portion (C) and both end sides (
A uniform injection distribution can be achieved over all of E) and (E).

Incidentally, although reference numerals are written in the claims section for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of a fluid injection nozzle according to the present invention, FIG. 2 is a bottom view thereof, and FIG.
The figure is a sectional view taken along the line m-'m in Figure 2, and Figure 4 is a cross-sectional view taken along line m-'m in Figure 2.
5 is a cross-sectional view taken along the line IV-IV in FIG. 4, and FIG. 6 is a side view of fluid ejected using the fluid injection nozzle of the present invention. A jet distribution diagram, FIG. 7 is an explanatory diagram showing the fluid jet situation in plan view, and FIG. 8 is a side view showing a conventional fluid jet nozzle.
Fig. 9 is a longitudinal sectional view thereof, Fig. 1O is a fluid ejection distribution diagram as seen from the side when fluid is ejected using a conventional fluid ejection nozzle, and Fig. 11 is an explanatory diagram showing the situation of fluid ejection as seen from above. It is. (1)...Nozzle body, (1a)...
Bottomed inner circumferential surface, (lb)...Bottom side outer circumferential surface, (2
)...Notch, (3)...Discharge port, (
4)...Protrusion, (P,)...Central axis, (S,)...Virtual central plane, (S2)...
...Orthogonal plane.

Claims (1)

[Scope of Claims] A bottomed inner circumferential surface (1a) that is concentric or substantially concentric with the center axis of the body is formed on the inner bottom of the bottomed cylindrical nozzle body (1), and the nozzle body ( There are discharge ports (3) and (3) on the bottom side of 1).
) for forming a pair of notches (2), (2) are separated on both sides of a specific virtual central plane (S_1) including the central axis (P_1) of the bottomed inner peripheral surface (1a). The pair of notches (2), (2) are perforated so that each width center thereof includes the central axis (P_1) of the bottomed inner circumferential surface (1a) and is located in the virtual central plane. Orthogonal plane (S_2) perpendicular to (S_1)
The bottom side outer circumferential surface (1
b), and in the center of the bottomed inner circumferential surface (1a) between the pair of notches (2), (2), a protrusion (
4) A fluid injection nozzle provided with.