JP2009101266A - Wide-angle vaneless full-cone spray nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spray nozzle which has a vaneless constitution, has a diameter large enough for foreign matters to pass through, and produces a wide-angle full-cone spray pattern of 100-130° by effectively forming a turbulent flow. <P>SOLUTION: The spray nozzle is characterized in that a bottom-blind spray liquid introduction port is arranged to be opened to one end side of a nozzle body, a bottom-blind turbulent flow chamber opened to the lateral side perpendicular to the spray liquid introduction port is arranged on the other end side of the nozzle body, a bottom wall of the spray liquid introduction port is communicated with a peripheral wall of the turbulent flow chamber by a small-diameter communicative passage eccentric and tilted to the axis of the spray liquid introduction port, a turbulent flow means in which at least three linear grooves or projections are made to cross one another radially is arranged on the bottom surface of the turbulent flow chamber and a nozzle throat of a nozzle cap to be screwed into an opening of the turbulent flow chamber has a trumpet-like surface the diameter of which is increased gradually toward the outside like a curved line. A spray liquid is accelerated under pressure between the spray liquid introduction port and the communicative passage and made to enter the turbulent flow chamber, form the turbulent flow, in which a whirling current produced by the eccentric and tilted diameter of the communicative passage interferes with an axial current accelerated or decelerated partially by the turbulent flow means, and produce the full-cone spray pattern the angle of which is widened on the trumpet-like surface of the nozzle throat. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vaneless full cone spray nozzle capable of forming a wide-angle spray, and in particular, for various purposes such as spray cooling or spray cleaning with a wide range of water, or widespread application of poor quality water containing a large amount of foreign matter. It relates to the spray nozzle used.

  Conventional wide-angle spray nozzles include those shown in FIGS. 4A and 4B, for example, and this spray nozzle 10 has a cylindrical nozzle body 11 having an inlet on one end thereof connected to a spray liquid supply pipe (not shown). And a cylindrical nozzle cap 12 which is screwed at one end to the inner surface of the other end on the axis of the nozzle body 11 and has a circular nozzle port 13 at the center of the other end. A vane 14 protruding toward the axis is provided on the inner peripheral surface of one end of the nozzle cap 12, and turbulent flow is generated in the spray liquid that is sent from the inlet of the nozzle body 11 and passes therethrough, and is ejected from the nozzle opening 13. The spray that is formed forms a circular spray pattern by this turbulent flow. Since the vane 14 protruding into the spray liquid flow path reduces the actual size of the flow path diameter, when foreign matter is mixed in the spray liquid, the foreign substance passage diameter becomes small. However, there is a risk that clogging may easily occur and clogging may occur, which hinders smooth spraying.

  In view of this, a vaneless spray nozzle that aims to generate turbulent flow without using a vane has been proposed. An example is shown in FIGS. 5A, 5B, and 5C (see Patent Document 1). The vaneless spray nozzle 20 includes a nozzle body 21 provided with an introduction port 23 that is opened on one end side of a first axis and into which a supply pipe (not shown) of a spray liquid such as cooling water is screwed, and the nozzle body. Of the cylindrical turbulent flow chamber 25 provided along the second axis perpendicular to the first axis on the other end side of the first axis of the second axis. The nozzle cap 22 is screwed into the opening at one end. At the other end of the second axis, the turbulent flow chamber 25 has a closed bottom wall, and the bottom wall surface and the cylindrical peripheral wall are continuous with a curved surface by an arc surface 26. The turbulent flow chamber 25 communicates with the introduction port 23 through a relatively small diameter communication passage 24 that is displaced from the first axis toward the bottom wall of the turbulent flow chamber 25 in a part of the peripheral wall. The nozzle cap 22 has a nozzle port 27 along the second axis at the center, and the inner peripheral surface 28 has a diameter linearly from the outer periphery of the inner surface to the central portion as seen in the sectional view of FIG. 5A. The slope portion 28a that gradually decreases, the curved throat portion 28b that is substantially in the center, and the trumpet portion 28c that gradually increases in diameter toward the outer surface again. In particular, the vaneless spray nozzle 20 includes a land portion 29 that surrounds the nozzle opening 27 on the outer surface of the nozzle cap 22 and swells substantially in a cross shape, and the surface of the land portion 29 that is continuous with the surface of the trumpet portion 28c is a trumpet portion. The curved surface 28c is extended substantially in the cross direction.

  In this configuration, the spray liquid supplied from the spray liquid supply pipe (not shown) to the inlet 23 under a predetermined pressure is accelerated by the small-diameter communication path 24 and sent to the turbulent flow chamber 25. The liquid flow sent to the turbulent flow chamber 25 strikes the peripheral wall on the side opposite to the communication path and changes its direction to form a vortex flow. A part of the nozzle cap 22 side is directed to the nozzle port 27 by the hydraulic pressure. A part of the bottom wall side becomes a flow that interferes with the vortex in the second axial direction along the curved surface of the circular arc surface 26, and a turbulent flow directed toward the nozzle port 27 as a whole is formed. The configuration in which the communication path 24 is displaced to the bottom wall side of the turbulent flow chamber 25 is effective for directing the turbulent flow.

  The turbulent spray liquid that has reached the nozzle opening 27 is accelerated by the slope portion 28a and the throat portion 28b and diffused by the trumpet portion 28c to form a wide-angle spray pattern. The land portion 29 provided in a substantially cross shape is a trumpet portion. In order to extend the surface of 28c in the cross direction, it is possible to obtain a wide-angle and square spray pattern by extending the spray in the cross direction, that is, in the diagonal direction of the square.

FIG. 6 shows a conventional spray nozzle 30 that generates a full cone spray pattern without a land portion on the outer surface of the nozzle cap from the vaneless spray nozzle having the configuration shown in FIG. Therefore, the nozzle body 31 of the vaneless spray nozzle 30 also has a spray liquid inlet 33 that opens at one end of the first axis, and one end along the second axis that is orthogonal to the axis on the other end of the first axis. And a nozzle cap 32 having a nozzle port 37 having the same curved surface 38 as that of FIG. 5A and screwed into the opening of the turbulent flow chamber 35, and a turbulent flow An arc portion 36 connecting the peripheral wall and the bottom wall of the chamber 35 with a curved surface, and a communication passage 34 communicating between a part of the peripheral wall of the turbulent flow chamber 35 and the bottom wall of the inlet 33. That is, the nozzle cap 32 has the same configuration as that of FIG. 5 except that the outer surface of the nozzle port 37 is not provided with a cross-shaped land portion, and the generated spray pattern is a circular full cone type.
Japanese Patent Publication No. 5-5541

  The conventional spray nozzle described with reference to FIG. 4 uses a vane as a turbulent flow generating means for generating a circular spray pattern. However, foreign matter accumulates due to a decrease in the diameter of the foreign matter passing through the spray liquid channel due to the vane. There is a risk of clogging and smooth interruption of spraying. The spray nozzle disclosed in Patent Document 1 in FIG. 5 attempts to use a turbulent flow generation means to generate a circular spray in a vaneless configuration first in order to generate a square spray pattern. The spray nozzle shown in FIG. 6 is the same as that shown in FIG. 5 for a circular spray pattern. However, the turbulent flow generating means in these conventional spray nozzles, however, are insufficient in effect, so that the generated spray angle is limited to 90 ° or less, and it cannot be sprayed over a wide range with a wider angle than that. There was a problem.

  The present invention is intended to solve the problems of such a conventional spray nozzle, and exhibits a high turbulent flow effect while maintaining a sufficient foreign substance passage diameter of the flow path in the vane-less configuration. An object is to realize a spray nozzle capable of generating a wide-angle full cone spray pattern having an angle of 90 ° or more, preferably in a range of 100 to 130 °.

In order to achieve the above object, the wide-angle vaneless full cone spray nozzle of the present invention has a liquid introduction port that opens at one end on the first axis, and a connection portion that is screwed to the spray liquid supply pipe. One end of a second axis orthogonal to the first axis is open at one end, the other end is a closed bottom wall, and a part of the peripheral wall is connected through a small-diameter communication path that deviates from the first axis. A nozzle body having a cylindrical turbulent chamber communicating with the liquid inlet and a nozzle port formed in the center with a trumpet-shaped orifice surface with a gradually increasing diameter with the inner peripheral surface outward and the outer peripheral surface And a nozzle cap screwed into the opening of the turbulent flow chamber, wherein the bottom wall of the turbulent flow chamber is integrally formed on the inner surface of the turbulent flow chamber and intersects with each other about the second axis and extends in the radial direction. It is characterized by comprising turbulent means made of a linear member.
The wide-angle vaneless full cone spray nozzle according to the present invention is also characterized in that the turbulence means consists of at least three grooves or projections intersecting each other at an equal angle.
Further, the wide-angle vaneless full cone spray nozzle according to the present invention is provided by inclining the axis of the communication path that deviates from the first axis in the direction of increasing the deviation from the first axis on the turbulent flow chamber side. It is characterized by.
Furthermore, the wide-angle vaneless full cone spray nozzle according to the present invention is a wide-angle full cone spray pattern having a spray angle of 100 to 130 °.

  The effects of the wide-angle vaneless full cone spray nozzle according to the present invention are as follows. That is, the spray liquid supplied at an appropriate pressure from the spray liquid supply pipe connected to the connection portion to the liquid inlet is accelerated through the communication path and flows into the turbulent flow chamber, and the turbulent flow chamber facing the communication path outlet. It collides with the cylindrical peripheral wall and turns its direction, resulting in a swirling flow that swirls about the second axis of the turbulent chamber. Meanwhile, a part of the swirl flow on the nozzle port side is pushed out to the nozzle port by the pressure, but the swirl flow on the bottom wall side of the turbulent flow chamber collides with the radial linear member of the turbulence means provided on the inner surface of the bottom wall, Oriented in the second axial direction, that is, from the bottom wall of the turbulent flow chamber toward the nozzle opening, partly speeded up, partly slowed down axially and interfered with swirling flow, As a whole, a complicated turbulent flow toward the nozzle opening is formed. The nozzle opening that opens outwardly in a circular trumpet diffuses the sprayed turbulent spray liquid at a wide angle in the entire circumferential direction, thereby realizing a wide-angle full cone spray pattern.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show an embodiment of a wide-angle vaneless full cone spray nozzle according to the present invention. The spray nozzle 40 is basically configured in the same manner as the conventional spray nozzle 30 described with reference to FIG. 6 except for the bottom wall of the turbulent flow chamber. Accordingly, the nozzle body 41 is provided with a connecting portion 44 connected to the tip of a spray liquid supply pipe (not shown) on one end side of the first axis in the longitudinal direction, and a bottomed liquid introduction port 45 opening on the end face is formed. Is done. The thread for screwing with the spray liquid supply pipe is provided on one or both of the outer peripheral surface of the connecting portion 44 having a cylindrical shape and the inner peripheral surface of the liquid introduction port 45.

  The nozzle body 41 includes a turbulent flow chamber 42 that opens at one side end on a second axis orthogonal to the first axis on the other end side and closes the other end side to serve as a bottom wall, The outer periphery of the nozzle cap 43 is screwed into an opening provided with a thread on the peripheral surface. A nozzle port 48 is provided along the center of the nozzle cap 43 aligned with the second axis, and an inner peripheral surface of the nozzle port 48 faces the turbulent flow chamber 42 and has a slope portion 48a that gradually decreases in diameter linearly, The throat portion 48b has a diameter reduced substantially at the center, and a trumpet portion 48c whose diameter gradually increases outward from the throat portion 48b.

  The turbulent flow chamber 42 communicates with the liquid introduction port 45 through a small-diameter communication passage 46 provided at a part of the cylindrical peripheral wall and deviated from the first axis. Desirably, as shown by a dotted line in FIG. 1A and a solid line in FIG. 1C, the communication line 46 is inclined in a direction in which the deviation from the first axis is increased on the turbulent flow chamber 42 side, thereby increasing the communication path. The axis 46 is secondly offset from the axis, that is, the center line of the turbulent chamber 42. Of course, the deviation of the axis of the communication path 46 from the second axis may be greatly increased so that they are parallel to each other. Because the spray passage 46 that has been displaced or inclined in this manner causes the spray liquid flowing into the turbulent flow chamber 42 from the communication passage 46 to hit the peripheral wall at a position deviating from the first axis, it mainly swirls in the turbulent flow chamber. A flow will be generated.

  The turbulent flow chamber 42 further includes turbulent flow means 47 on the surface of its bottom wall. In this embodiment, as seen in FIGS. 2A and 2B, three linear grooves each having a length substantially equal to the diameter of the turbulent chamber 42 intersect each other at an equal angle with the second axis as the center. Are arranged in a hexagon. Accordingly, six wall surfaces that intersect the radial direction with respect to the circumferential direction of the turbulent flow chamber are provided on the bottom wall. Then, the swirl flow on the bottom wall side of the turbulent chamber collides with these radial wall surfaces and is directed in the second axis direction, that is, from the bottom wall of the turbulent chamber toward the nozzle port, and partly speeds up. Then, a part of the axial flow is reduced in speed, interferes with the swirling flow, and a complicated turbulent flow toward the nozzle port 48 is formed as a whole. The nozzle opening that opens in a circular trumpet shape outwards diffuses and sprays the sprayed turbulent spray liquid in a complete conical shape with a wide angle of 100 to 130 ° in the entire circumferential direction, creating a wide-angle full-cone spray pattern. Realized.

  Here, a groove having a substantially U-shaped cross section is shown as the best embodiment of the turbulent flow means 47, but a groove having a V-shaped cross section may be used, and an inverted U-shaped or inverted V-shaped groove may be used instead of the groove. It can also be a protrusion with a letter-shaped cross section. When the protrusion is used, it may have an I-shaped cross section. Regarding the number of linear members intersecting in the radial direction, the formation of turbulent flow is weak when the number is two, that is, the cross shape, and the spray angle is less than 100 °. In addition, even if the number is four, that is, more than the shape of a letter, the effect is comparable to or more than the case of three, but in practice three is sufficient.

この表１から判るように、図６に示す従来のスプレーノズルと比較して、本発明によるスプレーノズルは同流量でも最大異物通過径を大きくでき、スプレー角度は１２０°となり、スプレーパターンは円形全面噴霧の広角フルコーンスプレーパターンを示した。 Table 1 shows the connection screw diameter of the connecting portion of the spray nozzle of the present invention in the above embodiment in which the linear member of the turbulent flow means 47 has three grooves and the spray nozzle of the conventional example shown in FIG. The experimental result which compared what changed the communicating passage diameter (maximum foreign material passage diameter) so that the flow rate (spray amount) at the time of 8 inches (about 9.5 mm) and the spray liquid pressure is 0.2 MPa becomes three kinds is shown. .
Table 1

As can be seen from Table 1, compared to the conventional spray nozzle shown in FIG. 6, the spray nozzle according to the present invention can increase the maximum foreign substance passage diameter even at the same flow rate, the spray angle is 120 °, and the spray pattern is a circular entire surface. A sprayed wide angle full cone spray pattern was shown.

  FIG. 3 shows the pressure / flow rate and pressure / spray angle of the spray nozzle according to the present invention using the turbulent flow means by the three intersecting grooves of the above embodiment, when the spray amount is 13 L / min when the pressure is 0.2 MPa. A performance diagram was shown, showing a spray angle of 117 ° at a pressure of 0.1 MPa, 113 ° even at 0.7 MPa, and a sufficiently wide-angle spray pattern was obtained.

The top view of one Example of the wide angle vaneless full cone spray nozzle concerning this invention. 1B is a front view showing the internal configuration of the wide-angle vaneless full cone spray nozzle of FIG. FIG. 1B is a right side view of the wide-angle vaneless full cone spray nozzle of FIG. 1A. The cross-sectional perspective view which follows the AA line of FIG. 1B. FIG. 1C is a cross-sectional perspective view taken along line BB in FIG. 1C. 1A-1C is a performance diagram of pressure / flow rate and pressure / spray angle of the wide angle vaneless full cone spray nozzle of FIGS. The top view of the spray nozzle with the conventional vane. 4B is a front view showing the internal configuration of the spray nozzle of FIG. Front sectional drawing of an example of the conventional wide angle vaneless spray nozzle. FIG. 5B is a top view of the spray nozzle of FIG. 5A. FIG. 5B is a right side view of the spray nozzle of FIG. 5A. The front view which notched some other examples of the conventional wide angle vaneless spray nozzle.

Explanation of symbols

40 Spray nozzle 41 Nozzle body 42 Turbulent chamber 43 Nozzle cap 44 Connection 45 Liquid inlet 46 Communication path 47 Turbulent means 48 Nozzle port

Claims (4)

A connecting portion having a liquid inlet opening on one end on the first axis and screwed to the spray liquid supply pipe, and one end of the second axis orthogonal to the first axis on the other end side A nozzle body having a cylindrical turbulent chamber that communicates with a liquid inlet through a small-diameter communication path that has an opening, the other end is a closed bottom wall, and a part of the peripheral wall is displaced from the first axis; Wide-angle vaneless comprising a nozzle cap in the center with a trumpet-shaped orifice surface that gradually increases in diameter in a curved manner with the peripheral surface facing outward, and a nozzle cap that is screwed into the opening of the turbulent flow chamber on the outer peripheral surface In full cone spray nozzle,
A wide-angle vane characterized in that the bottom wall of the turbulent flow chamber is formed integrally with the inner surface thereof, and has a turbulent flow means comprising a plurality of linear members that intersect each other about the second axis and extend radially. Resful cone spray nozzle.   2. The wide-angle vaneless full cone spray nozzle according to claim 1, wherein the turbulent means comprises at least three grooves or projections intersecting at an equal angle to each other.   2. The wide-angle vaneless full cone according to claim 1, wherein the axis of the communication path deviated from the first axis is provided to be inclined in the direction of increasing the deviation from the first axis on the turbulent flow chamber side. spray nozzle. The wide angle vaneless full cone spray nozzle according to any one of claims 1 to 3, wherein the wide angle full cone spray pattern has a spray angle of 100 to 130 °.

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