JPH055541B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vaneless spray nozzle, particularly a vaneless spray nozzle capable of discharging a liquid fluid such as cooling water with a substantially square discharge pattern, and the manufacture thereof. Regarding the method.

Vaneless spray nozzles of this type are useful in dispensing a variety of liquid water streams, such as when used for cooling water sprays.

(Prior Art) As conventional spray nozzles, those shown in FIGS. 8, 9, 11, and 12 have been used. The spray nozzle 10a shown in FIGS. 8 and 9 includes a nozzle body 11a and a nozzle cap 12a screwed onto the nozzle body 11a, and the spray nozzle 10a is introduced into the nozzle cap 12a. A vane 16a is installed to make the liquid water flow turbulent. Further, a nozzle opening 17a is provided at the center of the front surface of the nozzle cap 12a, and the nozzle opening 17a has a circular outline. However, when the liquid water flow is sent to the spray nozzle 10a,
Liquid fluid may be ejected from the nozzle orifice in a circular ejection pattern.

In this case, if the surface to be sprayed is circular, there is no problem because it matches the emission pattern, but if the surface to be sprayed is in the shape of a long strip, for example,
If spraying is performed intermittently so that the discharge patterns do not overlap each other as shown in FIG. Furthermore, as shown in Figure 10b, if the emission patterns are sprayed continuously so that they partially overlap each other, the unsprayed areas between the emission patterns will be reduced, but there will be areas where the emission patterns overlap and areas where they do not overlap. , there was a problem of uneven spraying.

In order to solve this problem, Figures 11 and 12
The spray nozzle 10b shown can be utilized. In the spray nozzle 10b, a nozzle cap 12b is screwed onto the front end of a nozzle body 11b in which a vane 16b is installed, and a circular nozzle opening 17b is provided in the center of the nozzle cap 12b. A land portion 19b is formed surrounding it. This land part 19
b is formed into a square shape whose center coincides with the center of the nozzle opening 17b, and the peripheral wall of the nozzle opening 17b is formed as a truss-shaped orifice surface that gradually expands toward the front. The liquid water flow flowing out along the surface is affected by the square land portion 19b and draws a substantially square discharge pattern as shown by the dotted line in FIG. Therefore, by spraying these discharge patterns so that they are adjacent to each other, the unsprayed area can be greatly reduced and spray unevenness can also be suppressed.

(Problems to be Solved by the Invention) However, in the case of the spray nozzle 10b shown in FIGS. 11 and 12, as turbulent flow is generated by the action of the vane, when spraying a liquid water stream,
The side of the emission pattern has a twist angle α with respect to the horizontal line of the sprayed surface, and the sprayed surface must be installed to match this twist angle α.
There was a problem that the spraying work was complicated. Furthermore, even if there is a slight change in the supply water pressure of the liquid water flow, a change in the density of the supplied liquid water flow, or a change in the distance to the sprayed surface, the torsion angle α changes, so even if the sprayed surface is displaced. I was worried that even if I tried, I wouldn't be able to get a satisfactory effect. Furthermore, in the case of this spray nozzle 10b, the vane 16b
Because the sprayer is built inside, there is a risk that foreign particles contained in the liquid water flow may accumulate and cause clogging, and in this case, there is a problem that it is not possible to perform a smooth spraying operation.

It is therefore an object of the present invention to be able to consistently obtain a substantially rectangular, in particular square, emission pattern;
A vane that does not create twist angles, has a discharge pattern that is not substantially affected by changes in supply water pressure or concentration of liquid water flow, and can avoid defective spray operations due to clogging. Our objective is to provide a spray nozzle that does not require spraying.

(Means for Solving the Problem) According to the present invention, this object is achieved by: a nozzle cap being screwed onto the front part of the nozzle body; a circular nozzle opening provided in the center of the nozzle cap; In a vaneless spray nozzle in which a land portion is formed surrounding the nozzle mouth, and a peripheral wall having a ripple-shaped orifice surface that gradually expands toward the front around the nozzle mouth, the land portion is located at the center of the nozzle mouth. This is achieved by forming a substantially cross shape having a center coincident with the cross, and characterized in that the outer edges of adjacent sides of the cross are provided as arcuate edges.

(Function) In the vaneless spray nozzle according to the present invention having the above-described configuration, the generation of a torsion angle is prevented by adopting a configuration that allows generation of turbulent flow without using vanes, and the nozzle opening surrounding wall provided in the nozzle cap is The liquid stream exiting along the truncated orifice surface can be sprayed with a highly square, in particular squared, discharge pattern under the action of the substantially cross-shaped lands.

(Example) Referring to FIGS. 1 to 3, a spray nozzle 10 according to the present invention includes a nozzle body 11 and a nozzle cap 12 screwed onto the nozzle body 11. An inlet 13 that is connected to a supply pipe (not shown) for a liquid water flow such as cooling water is extended to the nozzle body 11, and a communication passage 14 that communicates with the inlet 13 and has a smaller diameter than the inlet 13 is connected to the inlet. It is slightly deviated from the central axis of 13 and extends in the axial direction. The nozzle body 11 also has a turbulence chamber 1 which is connected to an inlet 13 and a communication passage 14 and extends in a direction perpendicular to the central axis of the inlet 13.
5 is formed.

The turbulent flow chamber 15 is closed on one side and opened on the other side, and has a communication passage 14 near the closed surface on one side.
are being communicated. Further, the closed surface of the turbulent flow chamber 15 and the side peripheral wall surface are connected via an arcuate surface 16,
It is formed to have a bowl shape as a whole, and the communication passage 1
A part of the liquid water flow such as cooling water flowing into the turbulent flow chamber 15 from the communication passage 14 changes direction toward the opening side, and at the same time, other liquid water flows flowing from the communication path 14 into the turbulent flow chamber 15 and reaching the closed surface. The part rises in a spiral path along the arcuate surface 16, and is provided so that it interferes with and merges with a part of the liquid water flow that is changing direction at right angles to produce a turbulent flow. .

On the other hand, the nozzle cap 12 is equipped with a nozzle port 17, and the circumference of the nozzle port 17 has a tapered orifice surface consisting of a region 18a whose area gradually narrows, a throat section 18b, and a region 18c whose area gradually increases. A peripheral wall 18 having a diameter is formed. Furthermore, a nozzle opening 17 is provided on the front surface of the nozzle cap 12.
A land portion 19 is expanded to surround the nozzle orifice 17. mutually adjacent outer edge parts 20b, 21a; 21b, 22a; 22b, 23
a; 23b, 20a are mutually arcuate edges 24a to 24d
It is linked as .

In addition, in the above-described configuration, the arcuate surface 16 of the turbulent flow chamber 15
The radius is preferably 2/10 to 3/10 of the diameter d of the turbulent flow chamber 15, and is perpendicular to the axis of the inlet 13, that is, with respect to the extending direction of the inlet 13 and the communication path 14. It has been experimentally found that the length h of the nozzle body 11 in the right angle direction is preferably 1 to 2 times the diameter d of the turbulence chamber 15.

Further, when comparing FIGS. 4 and 5, the cross-shaped land portion 19 of the nozzle cap 12 is located at each side 2.
The longest distance from 0 to 23, that is, the farthest distance L1 between the sides located at symmetrical positions across the center of the nozzle opening 17,
The ratio of the shortest distance, that is, the shortest distance L2 between arcuate edges located symmetrically across the center of the nozzle opening 17, is L2/
It is formed so that L1=0.5 to 0.9. In addition, the ratio of the length l1 from the base of the nozzle opening 17 to the most concave point of one of the arcuate edges 24a to 24d to the length l2 from the base of the nozzle opening 17 to the tips of the sides 20 to 23 is (l2 /l
1) Formed to satisfy the expression <1. In this case, each side of the cross-shaped land portion 19 is
It is preferable to form an angle of about 45 degrees.

Furthermore, a method of manufacturing a spray nozzle according to the present invention will be explained. First, the nozzle body 11 having the above-mentioned shape is formed of metal by a well-known metal grinding process, and then the nozzle cap 12 to be screwed onto the front part of the nozzle body 11 is similarly obtained by a metal grinding process. In this case, the nozzle port 17 is located on the front of the nozzle cap 12.
An annular critical groove 24 is formed concentrically with the center of the groove (see FIGS. 6a and 6b). The inner edge of the critical groove 24 becomes the tip of each side 20 to 23 of the land 19. Next, preferably using an end mill 25 having the same diameter as the diameter of the arcuate edge formed by the mutually adjacent outer edges of each of the above-mentioned sides 20 to 23, the front surface of the nozzle cap 12 is rotated at a rotation angle of 90 degrees from each other. Grinding is performed at four locations at intervals to form land portions 19 (see FIGS. 7a and 7b). At this time, so as to satisfy the above formula L2/L1 = 0.5 to 0.9,
The grinding area at the four grinding points is the critical groove 24.
radially inward, and at the same time the above (l
2/l1)<1 is satisfied. Further, the above-mentioned grinding point is set at a position such that each side portion 20 to 23 of the cross-shaped land portion 19 forms substantially 45 degrees with respect to the horizontal line. Finally, by screwing the nozzle cap 12 tightly onto the nozzle body 11, the spray nozzle 10 as shown in FIGS. 1 to 3 is completed.

(Effects of the Invention) According to the vaneless spray nozzle according to the present invention configured as described above, the liquid water flow sent into the nozzle has a highly rectangular, particularly square discharge pattern, and is constantly and It can be sprayed uniformly without creating twist angles, and the efficiency of work associated with liquid water jet spraying can be significantly improved. In addition, unlike the above embodiment, the nozzle does not have a vane for generating turbulence, so foreign particles can be easily sprayed. This achieves effects such as sufficient prevention of clogging due to accumulation.

[Brief explanation of the drawing]

FIG. 1 is a central vertical sectional view of a vaneless spray nozzle according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an end view thereof, FIG. 4 is a partial plan view of the nozzle cap, and FIG. A partial sectional view of the nozzle cap, Figures 6a and 7a and b and 7a and b are explanatory diagrams of the manufacturing process of the nozzle cap, Figure 8 is a front view of a conventional spray nozzle, and Figure 9 shows the same part. A side view showing a cross section, FIGS. 10a and 10b are explanatory diagrams of a discharge pattern by the same spray nozzle, FIG. 11 is a side view showing a part of a conventional spray nozzle in a cross section, and FIG. 12 is a front view of the same. . 10... Spray nozzle, 11... Nozzle body,
12... Nozzle cap, 13... Inlet, 14... Communication path, 15... Turbulent flow chamber, 16... Arc surface, 17... Nozzle opening, 18... Peripheral wall, 19... Land part, 20-23
...side part, 20a-23b...outer edge part, 24a-24
d...Arc-shaped edge, 25...End mill.

Claims (1)

[Scope of Claims] 1. A nozzle cap is screwed to the front part of the nozzle body, a circular nozzle opening is provided at the center of the nozzle cap, and a land portion is formed on the front surface surrounding the nozzle opening, and A vaneless spray nozzle is equipped with a circumferential wall having an orifice surface in the shape of a bump that gradually expands toward the front around the nozzle opening, and the land portion has a substantially cross-shaped orifice surface whose center coincides with the center of the nozzle opening. What is claimed is: 1. A vaneless spray nozzle which is shaped like a cross and has outer edges of adjacent sides thereof arranged as arcuate edges. 2 The nozzle body is provided with an inlet and a communication passage connected to the supply pipe, and a turbulence chamber that extends in a direction perpendicular to the extension direction of the inlet and the communication passage and communicates with the nozzle opening, and one side of the turbulence chamber is closed. 2. The vaneless spray nozzle according to claim 1, wherein one side is closed and the other side is open, and the closed surface and the side circumferential wall surface are connected on one side via an arcuate surface. 3. The land portion of the nozzle cap has a ratio of the furthest distance L1 between the edges located symmetrically around the center of the nozzle opening to the shortest distance L2 between the arcuate edges located symmetrically around the center of the nozzle opening. The vaneless spray nozzle according to claim 1, wherein L2/L1=0.5 to 0.9. 4 Length l1 from the base of the nozzle mouth to the most concave point of the arcuate edge and length from the base of the nozzle mouth to the tip of the edge
4. The vaneless spray nozzle according to claim 3, wherein the ratio of l2 to l2 is (l2/l1)<1. 5. preparing a nozzle body and a nozzle cap which is capable of being screwed onto the nozzle body and is equipped with a circular nozzle opening at the center, and a truss-shaped orifice surface that gradually expands toward the front around the nozzle opening; An annular critical groove is formed on the front surface of the nozzle cap concentrically with the center of the nozzle opening, and the front surface of the nozzle cap is substantially rotated at a rotational angle of 90 degrees to each other.
The critical grooves are ground radially inward from four locations at 100° intervals to form a substantially cross shape with a center that coincides with the center of the nozzle opening, and each side adjacent to each other. A method for manufacturing a vaneless spray nozzle, comprising forming a land portion whose outer edge forms an arcuate edge. 6. The manufacturing method according to claim 5, wherein the front surface of the nozzle cap is ground by an end mill having the same diameter as the arcuate edge formed on the land portion. 7. On the front surface of the nozzle cap, the ratio of the furthest distance L1 between the edges located symmetrically around the center of the nozzle opening to the shortest distance L2 between the arcuate edges located symmetrically around the center of the nozzle opening is: L2/L1 = 0.5 to 0.9, and the length l1 from the base of the nozzle mouth to the most concave point of the arcuate edge
The manufacturing method according to claim 5, wherein the manufacturing method is performed by grinding so that the ratio of the length l2 from the base of the nozzle opening to the tip of the side part is (l2/l1)<1.