JPH1034024A - Spray nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform spraying at a wide angle under low pressure. SOLUTION: An inflow hole 14 is pierced in a body 11 along the axis line direction from one end of the body 11. A notch 16 is put in a body 11 from the outer peripheral direction on one side at a part of a jetting port 15 of the head of the inflow port 14. An end face 17 at which the jetting port is opened perpendicularly intersecting the axis line direction of the body, a side face extending in the axis line direction from the inner end of the end face, and a liquid receiving face 19 curved in the diameter direction from the head of the side face and made opposite to the end face are provided. A diffusing hole 21 is provided in a position opposite to the jetting port of the liquid receiving face, and also a groove 20 is cut in the side face curved provided successively to the diffusing hole 21. Fluid is diffused by the diffusing hole 21, and also the diffused fluid is corrected to the opening in front of the notch 16 by the groove. The ratio of (diameter of diffusing hole D1/diameter of jetting hole D2) is made 1.3-1.6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-pressure and wide-angle spray nozzle, and more particularly to a spray nozzle which can uniformly spray a fluid such as water supplied at a low pressure over a wide angle range.

[0002] Conventionally, wide-angle spray nozzles have been suitably used for applications where it is desired to widen the spray range at a low pressure, for example, for defoaming in water treatment facilities such as paper mills and sewage treatment plants. This type of spray nozzle is required to have a wide spray range, a small particle size of the spray, and a soft spray at a low pressure.

The present applicant has provided a spray nozzle having a structure shown in FIGS. 10A and 10B as this type of spray nozzle. The spray nozzle 1 has an inflow hole 3 formed at one end of the body 2, and an injection port 3 a at the tip of the inflow hole 3.
A notch 4 is formed in the body 2 from one side in the outer circumferential direction to make the periphery of the injection port 3a an end face 5 cut out in a direction orthogonal to the axis, while the inner end side of the injection port 3a has a diameter smaller than the axial direction. A liquid receiving surface 6 that faces the injection port 3a is formed by providing a radius in the direction and bending.

In the spray nozzle 1, the liquid jetted from the jet port 3a collides with the liquid receiving surface 6 to increase the jetting angle, and the particles become small in diameter and become fine. Therefore, the spray having a small particle diameter can be sprayed in a wide-angle fan shape over a wide range.

[0005]

The above-mentioned spray nozzle 1 has a fluid pressure ejected from the ejection port 3a of 1.5 kg / c.
When the pressure is as high as m ² , the liquid can collide against the facing liquid receiving surface 6 with a strong pressure and spray at a wide angle. In that case, since the fluid pressure is high, the spray pressure also increases.

When the spray nozzle 1 requires a soft spray with a low spray pressure, a low pressure, for example, 0.1
When the fluid is ejected from the ejection port 3a at a pressure of about 5 kgf / cm ² , the ejected fluid does not diffuse at a wide angle, flows along the liquid receiving surface 6 from the side surface 4a of the notch 4 continuous with the ejection port 3a, and is weak. It collides with the liquid receiving surface 6 by pressure, and is sprayed at an angle smaller than the opening end.

Specifically, in the spray nozzle shown in FIG. 10, if the fluid pressure is as high as about 1.5 kgf / cm ² , the spray range can be wide angle spray of about 140 °.
When the fluid pressure is extremely low, such as about 0.15 kgf / cm ² , the spraying range becomes as narrow as about 80 °, and there is a problem that the particle size does not become small due to the thick sprayed layer.

The present invention has been made in view of the above problems, and has as its object to provide a low-pressure wide-angle spray nozzle capable of spraying a low-pressure soft spray over a wide range.

[0009]

In order to solve the above-mentioned problems, according to the present invention, an inflow hole is formed in one end of the body along an axial direction from one end of the body. In the part, a notch is formed in the body from one side outer peripheral direction, the end face where the injection port is opened orthogonally to the body axis direction, a side surface extending axially from the inner end of the end surface, and a tip of the side surface A liquid receiving surface that is more radially curved and faces the end surface is provided, and a diffusion hole is provided at a position of the liquid receiving surface that faces the injection port, and the curved surface is formed continuously with the diffusion hole. A spray nozzle is provided, in which a groove is formed in the side surface, and the fluid is diffused by the diffusion hole and the fluid is diffused by the groove to the front opening of the notch.

In the spray nozzle having the above-mentioned structure, when the fluid, for example, water injected from the injection port is at an extremely low pressure of about 0.15 kgf / cm ² , the diffusion proceeds in a straight line to the liquid receiving surface without spreading much. Go straight into the hole. The water that has reached the diffusion holes is reflected and diffused at a wider angle than the diffusion holes. At that time, there is a groove so as not to diffuse toward the rear side surface opposite to the front notch opening, and the direction is corrected so as to go forward. If there is no groove, the fluid that hits the side surface flows along the side surface and drops as water droplets from the notch tip. Thus, by providing the diffusion hole and the groove,
Low pressure soft spray can be performed over a wide angle range.

It is preferable that the groove is formed continuously to the inner end of the injection port. When the groove is provided continuously from the diffusion hole to the injection port to widen the range of the groove, the spray direction can be corrected forward over a wide range. Further, the fluid ejected from the spray port can be guided to the diffusion hole.

The injection port and the diffusion hole are located on the same line, and the size of the injection port and the diffusion hole is set such that the diameter of the diffusion hole is 1.0 to 1.6 times the diameter of the injection port. (Claim 3).

The diameter of the diffusion hole (D2) is made equal to or slightly larger than the diameter (D1) of the injection port, and
/D1=1.0 to 1.3, or
In any case where the diffusion hole is enlarged in the range of D2 / D1 = 1.3 to 1.6, wide-angle spraying up to 180 ° can be performed.

The diameter (D2) of the diffusion hole is set to D2 / D1 = 1.3 to 1.6 times the diameter (D1) of the injection port, and the diameter of the diffusion hole is (L2). (L2 / D2) is preferably set to be larger than 0.5 (claim 4).

As described above, when the diameter of the diffusion hole is increased and the depth of the diffusion hole is increased, the water sprayed from the injection port is widely collected, and is uniformly reflected in a wide angle range and sprayed. Thus, the spray amount in the spray range can be made uniform.

[0016] The present invention, as described above, the fluid pressure supplied to the inlet as the low pressure of ^{0.05kgf / cm 2 ~0.5kgf / cm 2} , it is preferable to use as a spray nozzle for low pressure (claim 5).

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a spray nozzle 10 according to a first embodiment. The spray nozzle 10 has a large-diameter inflow hole 12 having a diameter D3 which is opened in the center of the rear end of the metal body 11 and extends along the center axis X of the body. A conical diameter-reduced chamber 13 communicates with the front end of the large-diameter inflow hole 12, and a small-diameter inflow hole 14 communicates with the front end of the reduced-diameter chamber 13. In addition, Body 1
1 is not limited to metal, but may be resin.

The tip end of the small-diameter inflow hole 14 becomes an injection port 15, and a cutout 16 is formed at a position corresponding to the injection port 15 from an outer peripheral surface on one side of the body 11. An end face 17 from which the mouth 15 is opened;
7, a side surface 18 extending in the axial direction from the inner end,
8 is provided with a liquid receiving surface 19 which is curved in the radial direction from the tip end and faces the end surface 17. The liquid receiving surface 19 is not perpendicular to the body axis, but is set at an angle of 70 ° to 75 °.

The injection port 15 has an opening at an end face 17 of the notch 16 except for an inner peripheral edge 15a. A groove 20 extending in the axial direction is formed in the side surface 18 of the notch 16 while being continuous with the inner peripheral edge 15 a. A diffusion hole 21 continuous with the front end of the groove 20 is formed in the liquid receiving surface 19 continuous with the front end of the side surface 18. It is recessed.

The groove 20 formed in the side surface 18 has the same arc-shaped bottom surface as the inner peripheral edge 15a of the injection port 15.
And a groove having an arc-shaped cross section. Therefore, of the fluid (water) ejected from the ejection port 15, the fluid along the side surface 18 goes straight through the groove 20.

The diffusion hole 21 recessed in the liquid receiving surface 19 is
Like the injection port 15, it is located on the central axis O of the body 11 and faces the injection port 15. The inner peripheral end side of the diffusion hole 21 communicates with the groove 20, so that the water traveling straight through the groove 20 reaches the diffusion hole 21.

The diameter D2 of the diffusion hole is set slightly larger than the diameter D1 of the injection port 15. That is, in the present embodiment, D2 / D1 is set to 1.3 to 1.6.
Also, assuming that the length L1 in the axial direction of the small-diameter inflow hole 14 in which the injection port 15 opens at the tip, the relationship with the diameter D1 is as follows.
L1 / D1 = 1.0-5.0, preferably L1 / D1
= 1.9 to 3.6.

On the other hand, the length of the diffusion hole 21 in the axial direction is L2
Then, the relationship with the diameter D2 is expressed as L2 / D2 = 0.
5 to 3.5. Note that L2 / D2 may be larger than 0.5, and the upper limit is not limited to 3.5. That is,
The small-diameter inflow hole 14 on the side of the injection port 15 is set to have a small diameter and a long length, while the diffusion hole 21 is set to be larger in diameter and shorter than the small-diameter inflow hole 14.

According to the experimental results of the present inventor, the above L2 /
When D2 was larger than 0.5, the flow rate distribution shown in FIG. 7A was obtained, and the distribution range was wide and the flow rate was substantially uniform within the distribution range. On the other hand, when 2 / D2 was smaller than 0.5, the flow rate distribution shown in FIG. 7B was obtained, and the distribution range was narrow and the flow rate was not uniform within the distribution range.

The spray nozzle 10 is provided with a large-diameter inflow hole 1.
A screw 23 is formed on the outer periphery of the body of the portion provided with 2, and a hexagonal grip portion 24 is formed at the front thereof.
The screw 23 is screwed and connected with a pipe (not shown) connected to a water supply source with a grip portion 24.

Next, the spray nozzle 1 having the above structure
The operation of 0 will be described. 0.15 kgf / cm ² low-pressure water flows into the large-diameter inflow hole 12 from the supply source via a pipe,
Through to the small-diameter inflow hole 14 and the injection port 15 at the tip
Inject more. Since the jetted water has a low pressure, it hardly diffuses, and becomes a substantially direct current toward the liquid receiving surface 19. Since the diffusion hole 21 is located opposite the injection port 15, the injection port 15
The water jetted from the nozzle reaches the diffusion hole 21. In addition, injection port 1
Of the water injected from 5, water along the inner peripheral surface side of the notch 16 flows along the side surface 18, and at that time, the groove 20 is provided in communication with the injection port 15, so that the groove 20 is formed. Then, it flows to the liquid receiving surface 19 and reaches the diffusion hole 21 communicating with the groove 20 at the liquid receiving surface 19.

The water that has reached the diffusion holes 21 is
Is reflected and diffused from the periphery of the notch.
6 scatters outside from the opening edge. At this time, the direction of the water that is going to diffuse to the rear side surface 18 is corrected by the groove 20 toward the opening side of the notch 16, thereby preventing the water from dripping along the side surface 18.

As described above, the diffusion hole 21 allows the spraying range to be widened over the limit regulated by the notch 16, that is, over an angle range of approximately 180 °. In addition, since the water pressure is reduced, a soft spray can be obtained.

Further, the diameter D2 of the diffusion hole 21 is
Is slightly larger than the diameter D1 of the injection port 15
Since the water sprayed from the nozzle is received over a wide range and reflected and diffused from the diffusion holes 21, the spray amount can be equalized over a wide spray range.

When the inventor conducted a spraying experiment using the spray nozzle 10 of the first embodiment at a water pressure of 0.15 kgf / cm ² , the spraying was performed over the entire spraying range of 120 ° as shown in FIG. A spray with a uniform amount was obtained.

FIG. 8 shows the second embodiment. The difference from the first embodiment is that a groove 20 ′ formed in the side surface 18 is formed only in a part of the curved side surface 18 continuous with the diffusion hole 21. That is the point. Thus, even when the groove is not continuous with the injection port 15 over the entire length of the side surface 18, the diffusion hole 2
The fluid that diffuses backward from the side 1 toward the side surface 18 can be received, and the orientation can be corrected forward to the opening of the notch 16.

FIGS. 9A and 9B show a third embodiment.
The difference from the first embodiment is that the diameter D1 of the injection port 15 and the diameter D2 of the diffusion hole 21 'are the same as the diameter D1 of the injection port 15. That is, D2 / D1 = 1.0. L1 / D1 is the same as in the first embodiment, ie, 1.9 to 3.
6, L2 / D2 = 0.5-3.5.

In the spray nozzle 10 of the second embodiment as well, the water sprayed from the spray port 15 diffuses the diffusion holes 21 '.
By collecting and reflecting over a wide area and spraying,
Sprays at a wide angle of about 120 °. However, since the diffusion holes 21 'are smaller than in the first embodiment, the spray amount is not uniform in the spray range as in the first embodiment. That is, the result of the experiment performed by the inventor has a flow rate distribution as shown in FIG.

As a result of an experiment using the conventional spray nozzle 1 shown in FIG. 10 and low pressure water of 0.15 kgf / cm ² , as shown in FIG.
゜ was narrow and the spray flow rate was not uniform.

[0035]

As is apparent from the above description, in the spray nozzle according to the present invention, a diffusion hole is provided on the liquid receiving surface facing the injection port, and a groove is formed on the side surface of the notch so as to be continuous with the diffusion hole. With the simple improvement provided, low-pressure fluid can be sprayed at a wide angle. The wide-angle spray makes the spray particle size smaller and finer, so that low-pressure soft spray can be performed over a wide range.

In particular, the diameter of the diffusion hole is made slightly larger than the diameter of the injection port, and the length with respect to the diameter of the diffusion hole is 0.1 mm.
When the diffusion hole is deepened to 5 or more, there is an advantage that the flow rate distribution can be made uniform in a wide-angle spray range.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a sectional view taken along line CC of FIG. 1;

6A is a drawing showing a spray pattern of the first embodiment, FIG. 6B is a drawing showing a spray pattern of the second embodiment, and FIG. 6C is a drawing showing a spray pattern of a conventional example.

FIG. 7A is a flow distribution pattern diagram of the first embodiment, and FIG. 7B is a flow distribution pattern diagram of a comparative example.

8A is a side view of the second embodiment, and FIG. 8B is a cross-sectional view.

FIGS. 9A and 9B are cross-sectional views of a second embodiment.

10A and 10B show a conventional spray nozzle, wherein FIG. 10A is a front view and FIG. 10B is a cross-sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Spray nozzle 11 Body 14 Small diameter inflow hole 15 Injection port 16 Notch 17 End surface 18 Side surface 19 Liquid receiving surface 20 Reflection regulating groove 21 Diffusion hole

Claims (5)

[Claims] 1. An inflow hole is formed from one end of the body along an axial direction, and a body is cut out from an outer peripheral side on one side at an injection port at a tip end of the inflow hole to be orthogonal to the body axis direction. An end surface where the injection port is opened, a side surface extending in the axial direction from the inner end of the end surface, and a liquid receiving surface that is curved in a radial direction from a tip of the side surface and faces the end surface, A diffusion hole is provided at a position facing the injection port on the liquid receiving surface, and a groove is formed in the curved side surface so as to be continuous with the diffusion hole. A spray nozzle characterized by being diffused to a front opening of a notch. 2. The spray nozzle according to claim 1, wherein the groove is formed continuously to the inner end of the injection port. 3. The injection port and the diffusion hole are located on the same line, and the size of the injection port and the diffusion hole is obtained by setting the diameter (D2) of the diffusion hole to the diameter (D1) of the injection port by D2. / D1
3. The spray nozzle according to claim 1, wherein the spray nozzle is set to 1.0 to 1.6. 4. 4. The diameter (D2) of the diffusion hole is set to D2 / D1 = 1.3 to 1.6 times the diameter (D1) of the injection port, and the diameter (D2) of the diameter of the diffusion hole is (L2). The spray nozzle according to any one of claims 1 to 3, wherein a ratio L2 / D2 of a diameter (D2) of the diffusion hole is set to be larger than 0.5. 5. A fluid pressure supplied to the inflow hole is 0.05.
Spray nozzle according to claim 1 or claim 2 is a low-pressure ^{kgf / cm 2 ~0.5kgf / cm 2} .