JP2016123935A - Wide angle full cone spray nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wide angle full cone spray nozzle, for setting a spray angle constant in a wide pressure range, and also providing a wide spray angle.SOLUTION: The present invention comprises a wide angle full cone spray nozzle for fixing a vane to the inside of a nozzle body, by providing a liquid discharge orifice on the downstream side, by providing a liquid supply port on the upstream side in a substantially hollow shape, and in the wide angle full cone spray nozzle, a vane central hole is formed in a central part of the vane, and a downstream side outer peripheral part of the vane is also formed in a taper shape, and an annular chamber is formed between an inner peripheral surface of the nozzle body and itself, and a vortex chamber is formed in front of the vane, and a plurality of angle passages having an angle are formed on the outer periphery of the vane, and a downstream side position of the angle passages is set in an upper position than a median line of the center of the vane central hole, and the lengths of the vortex chamber and the annular chamber are set to a diameter or less of the vane, and injection of a wide spray angle is made possible in a wide pressure range.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wide-angle full cone spray nozzle in which a spray angle is constant even when the pressure of a liquid is varied when spraying an object through a spray nozzle.

  Spray nozzles are used in various fields, such as painting, cleaning, and humidification. Among these, there is a complete conical liquid spray nozzle used for spraying a cooling liquid in a metal casting operation.

  For example, in a metal casting operation in which a metal material such as a steel slab is extruded from a mold, it is necessary to spray water on the extruded metal and quickly cool it. In this case, if the spray of the cooling liquid onto the metal material is not uniform, a portion that is suitably cooled and a portion that is not cooled are generated, resulting in poor surface quality or tearing.

  As this cooling spray nozzle, there is a so-called perfect conical liquid spray nozzle, in which the amount of liquid sprayed in the continuous casting operation is proportional to the speed at which the metal material is cast. It is required and it is desirable to make the spray pressure variable without changing the spray angle according to the casting speed.

  Conventionally, as this type of complete conical liquid spray nozzle, JP 2005-508741 exists.

Special table 2005-508741

  In the complete conical liquid spray nozzle disclosed in Patent Document 1, the nozzle body has a liquid flow path communicating with the discharge orifice, and a vane disposed upstream of the discharge orifice in the passage. A central orifice for creating a directional flow is spaced apart on the circumference. It also has multiple angled passages for directing multiple liquid flows in the tangential direction, causing liquid overflow and breakdown and merging with the axial flow to be discharged from the discharge orifice. The liquid is used for more uniform cooling of the cast metal despite changes in liquid pressure proportional to changes in the speed at which the metal is cast.

  However, the spray nozzle according to Patent Document 1 has a pressure range where the spray angle is constant is approximately 0.14 MPa to 0.6 MPa. The spray nozzle angle becomes narrow at a pressure of 0.7 MPa or more. Therefore, there is a limit to the casting speed range of the metal material that can be dealt with, and there is a problem that it cannot be dealt with when the casting speed range is wide from low speed to high speed.

    Moreover, the spray angle is about 70 °, and the range to cover is narrow. A large number of nozzles are required to arrange a plurality of nozzles in parallel and cover the entire surface of the metal material. Therefore, there is a problem that it takes time to maintain the nozzle system. In order to reduce the number of nozzles per nozzle system and to improve the maintainability, a nozzle having a wider spray angle has been desired.

    The present invention has been proposed in view of the above, and the object of the present invention is that the spray angle is constant in a wide pressure range from 0.1 MPa to 1.0 MPa, and the spray angle is 90 ° wider than 70 °. An object of the present invention is to provide a wide-angle full cone spray nozzle capable of covering up to the above range.

In order to solve the above-mentioned problem, the present invention according to claim 1 is substantially hollow and is provided with a liquid supply port 5 on the upstream side, a liquid discharge orifice 7 on the downstream side, and the inside of the nozzle body 2. A wide-angle full cone spray nozzle to which the vane 8 is fixed. A vane central hole 14 is formed in the central portion of the vane 8, and a downstream outer peripheral portion 9 of the vane 8 is formed in a tapered shape. An annular chamber 11 is formed between the inner peripheral surface of the vane 8, a spiral chamber 13 is formed in front of the vane 8, and a plurality of angular passages 15 having angles are formed on the outer periphery of the vane 8. It is a full cone spray nozzle, the position on the downstream side of the angle passage 15 is set to a position above the center line b of the center of the vane central hole 14, and the lengths of the spiral chamber 13 and the annular chamber 11 are set. The a is less than the diameter Lb of the vane 8, characterized in that to allow the injection of large spray angle in a wide pressure range.
The present invention according to claim 2 is the wide-angle full cone spray nozzle according to claim 1, wherein one angle passage end A of the angle passage 15 is collinear with a circumferential tangent line a of the vane center hole 14, The other most downstream end B of the angle passage 15 is positioned between the midline b of the vane central hole 14 and the tangent line a, and the length La of the spiral chamber 13 and the annular chamber 11 is set to 0. 0 of the vane diameter Lb. The flow path area of the angle passage 15 is 8 times to 1.0 times, and the area ratio is 1.2 times to 1.7 times the flow path area of the vane central hole 14.

According to the first and second aspects of the present invention, one angle passage end A of the angle passage 15 is collinear with the circumferential tangent line a of the vane central hole 14, and the other most downstream end of the angle passage 15. Since B is located between the midline b of the vane central hole 14 and the tangent line a, the liquid flowing in from the downstream end of the angle passage of the vane 8 has an increased flow area at the outer peripheral portion 9 on the vane downstream side. Rotating flow and turbulent flow are generated in the chamber, the amount and flow rate of the liquid rotating in the chamber can be adjusted, and even if the pressure is varied in the range of 0.1 Mpa to 1.0 Mpa, the spray angle does not change and is uniform A smooth spray distribution.
Further, since the length La of the spiral chamber 13 and the annular chamber 11 is set to 0.8 to 1.0 times the vane diameter Lb, the straight flow from the central hole 14 of the vane 8 and the angle passage are coupled with the above configuration. The rotating flow from 15 is moderately mixed in the chamber, and even if the pressure is varied in the range of 0.1 Mpa to 1.0 Mpa, the spray angle does not change, and a uniform spray distribution can be generated.
Further, since the flow passage area of the angle passage 15 is set to an area ratio of 1.2 times to 1.7 times the flow passage area of the vane center hole 14, the flow from the vane center hole 14 and the flow from the angle passage 15 are chambers. It is possible to obtain a uniform spray distribution by properly mixing and spraying.

(A) is a front view of the wide angle full cone spray nozzle which concerns on one Example of this invention, (b) is the sectional side view. (A) is a top view of the vane used by this invention seen from the downstream, (b) is a side view, (c) is a top view seen from the upstream. It is explanatory drawing which shows that a spray angle is substantially constant in the range of 0.1 Mpa to 1.0 Mpa when a spray angle is set to 90 °. It is explanatory drawing showing spray distribution. It is explanatory drawing which shows the measurement direction of spray distribution with the top view of the downstream of a spray nozzle.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the present invention is not limited to the illustrated embodiment, and various design changes can be made without departing from the spirit of the present invention. Needless to say.

  1A and 1B show a front view and a side sectional view of an embodiment of the present invention.

  In these drawings, reference numeral 1 denotes a wide-angle full cone type spray nozzle. In FIG. 5B, the right side in FIG. The left side corresponds to the downstream side. The spray nozzle 1 includes an elongated hollow cylindrical nozzle body 2. A threaded portion 3 for connecting to a supply line or a liquid supply pipe (not shown) is formed from the substantially central portion of the outer periphery of the nozzle body 2 to the upstream end on the right side in the drawing. Moreover, the downstream end side head outline 4 on the opposite side of the nozzle body 2 is formed in a hexagon as shown in FIG. This is because when a liquid supply pipe is connected to the screw portion 3, it is easy to tighten with a wrench.

  A supply port 5 for supplying liquid is opened on the upstream end side of the nozzle body 2, and a liquid passage 6 is formed in the nozzle body 2 along the axial direction. In addition, a liquid discharge orifice 7 is formed at the center of the downstream end of the nozzle body 2. The liquid discharge orifice 7 is formed in a substantially cylindrical shape, and the inner peripheral surface of the nozzle body 2 on the liquid discharge orifice side is formed in a tapered truncated cone shape whose inner diameter decreases toward the liquid discharge orifice 7. The outlet of the liquid discharge orifice 7 is formed in a truncated conical shape having a taper that increases in diameter toward the downstream side.

  As described above, when the outlet region of the liquid discharge orifice 7 is tapered toward the downstream side, the liquid flow is smoothly discharged along the taper, and a wide-angle spray can be generated. This is because of doing so. In this case, a constant spray angle in the range of 70 ° to 90 ° is maintained by adjusting the angle of R.

  A vane 8 that is press-fitted from the supply port 5 is provided at a substantially central portion of the liquid passage 6 inside the nozzle body 2. The outer peripheral portion 9 on the downstream side of the vane 8 has a tapered shape that tapers toward the upstream side, and the vane outer peripheral portion 10 on the rear side, that is, the upstream side contacts the inner peripheral surface of the nozzle body 2, and the vane 8 It is fixed.

  An annular chamber 11 is defined by the vane downstream side outer peripheral portion 9 and the inner peripheral surface of the nozzle body 2 facing the vane downstream side outer peripheral portion 9. Further, a spiral chamber 13 is defined by the flat front end surface 12 of the vane 8 and the inner periphery of the nozzle body 2, and these constitute a chamber.

  The vane 8 functions to cause a swirling motion with respect to the liquid passing through the nozzle body 2, breaks the liquid into particles, and discharges a conical spray pattern from the liquid discharge orifice 7.

  That is, a vane central hole 14 having a circular cross section coaxially with the liquid discharge orifice 7 is formed in the central portion of the vane 8.

  Further, on the outer peripheral portion of the vane 8, angle passages 15 extending from the liquid inlet side toward the spiral chamber 13 side, preferably having three angles, are formed at equal intervals.

  As shown in FIGS. 2A and 2C, these angular passages 15 are arranged around the periphery of the vane 8 by 120 ° apart along the circumference. These angle passages 15 are substantially rectangular when viewed from the downstream side and the upstream side.

  2B and 2C, θ is an angle of the angle passage 15 with respect to the middle line of the vane center hole 14 and is 25 ° to 35 °. α is the taper angle of the vane downstream side outer peripheral portion 9 and is 45 ° to 55 °, and the length of the downstream outer peripheral portion 9 is ½ of the axial length of the entire vane. W is the width of the angle passage 15, d is the depth of the angle passage 15, and the width W of the angle passage is larger than the depth d.

  A characteristic feature of the present invention is that, as shown in FIGS. 2B and 2C, one angle passage end A on the downstream side of the angle passage 15 is collinear with the circumferential tangent line a of the vane center hole 14. And the most downstream end B of the other angle passage of the angle passage 15 passes through the midline b and the tangent a of the vane center hole 14 when viewed from the side where the tangent and the angle passage end A are combined. It is configured to be between the sides.

  Therefore, the liquid flowing in from the downstream end side of the angular passage of the vane 8 has a flow passage area widened at the outer peripheral portion 9 on the downstream side of the frustoconical vane, thereby causing rotational flow and turbulent flow in the annular chamber 11 and the spiral chamber 13. Because of this, it is well mixed with the straight flow from the vane center hole 14. As described above, the other most downstream end B of the angle passage 15 is located between the vane central hole 14 and the side passing through the midline b and the tangent line a. By adjusting the amount of the liquid rotating in the spiral chamber 13 and the flow rate, the spray angle does not change in a wide angle even if the pressure is varied in a wide range of 0.1 Mpa to 1.0 Mpa, And produces a uniform spray distribution.

  Further, in the nozzle body 2 of the present invention, as shown in FIG. 1B, the length La of the spiral chamber 13 and the annular chamber 11 is 0.8 to 1 times the vane diameter Lb shown in FIG. It is composed of 0 times.

  In this way, the straight flow from the vane central hole 14 of the vane 8 and the rotational flow from the angle passage 15 are appropriately mixed in the annular chamber 11 and the spiral chamber 13, so that a wide range of 0.1 Mpa to 1.0 Mpa is achieved. Even if the pressure is varied in the range, the spray angle does not change over a wide angle, and a uniform spray distribution is generated.

  That is, when the ratio of the chamber length La to the vane diameter Lb is smaller than 0.8, the mixing of the straight flow and the rotary flow is reduced, so that the spray amount at the center of the nozzle is increased and the spray distribution is not uniform. Further, if the ratio of the chamber length La to the vane diameter Lb is larger than 1.0, the rotational flow increases in the chamber, so the amount of spray from the liquid discharge orifice 7 decreases and the spray distribution is not uniform. . Further, since the resistance of the mixed flow in the annular chamber 11 and the spiral chamber 13 is large, the flow rate is difficult to be output.

  Further, in the present invention, when there are three angle passages 15, the flow passage area of each angle passage 15 is 1.2 times as large as the flow passage area of the vane central hole 14 at the angle passage end A of the vane 8. The area ratio is 7 times.

  Within this area ratio, the flow from the vane central hole 14 and the flow from the angle passage 15 are sprayed with appropriate mixing in the annular chamber 11 and the spiral chamber 13, so that a uniform spray distribution is obtained. If the ratio is less than 1.2 times, the amount of fluid rotating in the annular chamber 11 and the spiral chamber 13 is small, so that the amount of spray from the liquid discharge orifice 7 at the center of the nozzle increases and the spray distribution is not uniform. When the ratio is larger than 1.7 times, since the amount and speed of the fluid rotating in the annular chamber 11 and the spiral chamber 13 are large, the amount of spray from the liquid discharge orifice 7 is small, the surrounding flow rate is large, and the uniform flow is obtained. No spray distribution.

  FIG. 3 shows an embodiment of the nozzle of the present invention, in which the spray angle sprayed from the liquid discharge orifice 7 is 90 °. As shown in the table, it is understood that the spray angle does not substantially change even when the pressure is changed in the range of 0.1 Mpa to 1.0 Mpa and the spray flow rate (L / min) is changed from 8.8 to 24.

  FIG. 4 is a graph showing the spray distribution of the nozzle of the present invention. Even if the inflow liquid pressure is changed to 0.7 Mpa and 0.2 Mpa, the spray distribution is uniform.

  FIG. 5 shows the measurement direction of the spray distribution. The spray distribution is the same in both the 45a direction and the 45b direction, and there is no bias.

  In addition, although the said Example demonstrated the case where the angle channel | path 15 was set to three, of course, it may increase / decrease suitably according to a use purpose.

  The present invention is suitable for use in, for example, metal casting operations. In a metal casting facility, a plurality of nozzles are arranged in parallel at regular intervals so that the discharge spray coating areas of adjacent nozzles partially overlap each other so that the cooling liquid uniformly strikes the coating area.

  Since the spray nozzle of the present invention has a wide spray angle, the number of spray nozzles can be reduced, so that the time required for nozzle maintenance can be shortened. Also, the cost can be reduced.

  In order for proper cooling of the metal material, the amount of liquid sprayed in the continuous casting operation must be proportional to the speed at which the metal material is cast. Then, the nozzle pressure is changed according to the speed to change the spray amount. The spray nozzle of the present invention does not change the spray angle even if the spray amount is changed by changing the pressure, so that even when the casting speed range is wide from low speed to high speed, the coolant can be uniformly applied to the coating region.

  The application is not limited to the cooling of the metal material, but may be used for other purposes such as cleaning or wetting of the article.

DESCRIPTION OF SYMBOLS 1 Spray nozzle 2 Nozzle main body 3 Screw part 4 Downstream end side head outline 5 Supply port 6 Liquid passage 7 Liquid discharge orifice 8 Vane 9 Vane downstream outer peripheral part 10 Vane outer peripheral part 11 Annular chamber 12 Tip surface 13 Swirl chamber 14 Vane center Hole 15 angle passage

A Angle passage end B Most downstream end C Angle passage surface a Tangent line b Middle line

Claims (2)

Wide angle, substantially hollow, provided with a liquid supply port (5) on the upstream side, a liquid discharge orifice (7) on the downstream side, and a vane (8) fixed inside the nozzle body (2) A full cone spray nozzle is provided, a vane central hole (14) is formed in the central portion of the vane (8), and a downstream outer peripheral portion (9) of the vane (8) is formed in a tapered shape. An annular chamber (11) is formed between the inner peripheral surface of 2) and a spiral chamber (13) is formed in front of the vane (8), and the outer periphery of the vane (8) has an angle. A wide-angle full cone spray nozzle formed with a plurality of angle passages (15),
The downstream position of the angle passage (15) is set to a position above the center line (b) of the center of the vane central hole (14), and the lengths of the spiral chamber (13) and the annular chamber (11) ( A wide-angle spray nozzle characterized in that La is set to be equal to or less than the diameter (Lb) of the vane (8), and spraying with a wide spray angle is possible in a wide pressure range. The wide-angle full cone spray nozzle according to claim 1,
One angle passage end (A) of the angle passage (15) is collinear with the circumferential tangent (a) of the vane center hole (14), and the other most downstream end (B ) Is positioned between the middle line (b) of the vane central hole (14) and the tangent line (a), and the length (La) of the spiral chamber (13) and the annular chamber (11) is set to the vane diameter ( Lb) is 0.8 times to 1.0 times, and the flow passage area of the angle passage (15) is 1.2 to 1.7 times the flow passage area of the vane central hole (14). Wide angle full cone spray nozzle characterized by

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