JP2010094657A - Two-fluid nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-fluid nozzle of a simple structure, capable of mixing and ejecting a liquid and a gas. <P>SOLUTION: The two-fluid nozzle includes an outer cylinder 1 wherein a nozzle hole 2 and a storing hole 6 communicating with the nozzle hole 2 are coaxially formed. A gas inflow hole 8 for supplying a gas communicating with the storing hole 6 is formed on the outer cylinder 1. A cylindrical member 12 with a mixing chamber 16 coaxially formed therein, to be inserted into the storing hole 6 to communicate with the nozzle hole 2, is inserted into the storing hole 6 in a manner keeping a gap in the radial direction. A slit 18 communicating with the storing hole 6 and the mixing chamber 16 is formed in the cylindrical member 12 along the circumference thereof. Further, an inner cylinder 20 is inserted into the storing hole 6 to keep itself pressed to the cylindrical member 12 in the direction of the nozzle hole 2. A liquid inflow hole 24 for supplying a liquid and a connection hole 26 communicating with the liquid inflow hole 24 and the mixing chamber 16, are coaxially formed in the inner cylinder 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a two-fluid nozzle that mixes and injects a liquid and a gas.

Conventionally, various types of two-fluid nozzles that mix and inject liquid and gas are known. For example, as disclosed in Patent Document 1, a double cylinder structure of an outer cylinder and an inner cylinder is used. A liquid flow path is formed in the cylinder, and an annular gas flow path is formed between the inner cylinder and the outer cylinder. In addition, a swirl groove for swirling the gas is formed in the gas flow path, a tapered flow path whose diameter is reduced toward the nozzle connected to the liquid flow path is formed, and further, the gas is passed through the orifice flow path. Are mixed with the liquid ejected from the nozzle.
JP2008-18400

  However, such conventional devices have a problem in that a plurality of swiveling grooves, tapered surfaces on the outer cylinder side and inner cylinder side, and an orifice flow path must be formed, and the structure is complicated and manufacturing is not easy. It was.

  An object of the present invention is to provide a two-fluid nozzle capable of mixing and injecting a liquid and a gas with a simple structure.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
In a two-fluid nozzle that mixes and injects liquid and gas,
A nozzle hole is formed, and an outer cylinder having a storage hole communicating with the nozzle hole is provided, and a gas inflow hole through which gas is supplied to the outer cylinder is formed.
A cylindrical member inserted into the storage hole and formed with a mixing chamber communicating with the nozzle hole is inserted into the storage hole with a radial gap, and the cylindrical member includes the storage hole, the mixing chamber, and Forming slits that communicate with each other along the circumferential direction,
Furthermore, an inner cylinder is inserted into the storage hole, the inner cylinder is pressed against the cylindrical member in the direction of the nozzle hole, a liquid inflow hole through which liquid is supplied to the inner cylinder is formed, and the liquid inflow hole This is a two-fluid nozzle characterized by forming a connection hole for communicating with the mixing chamber.

  The slits may be formed in an arc shape, the plurality of slits may be formed on the same circumference, and a plurality of rows may be formed in the axial direction of the cylindrical member. Alternatively, the cross-sectional area of the mixing chamber may be larger than the cross-sectional area of the connection hole.

  The two-fluid nozzle of the present invention has a simple structure in which a slit is formed in a cylindrical member, and has an effect that liquid and gas can be mixed and ejected.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
As shown in FIGS. 1 and 3, reference numeral 1 denotes an outer cylinder. The outer cylinder 1 has a nozzle hole 2 formed at one end thereof, and is connected to the nozzle hole 2 coaxially with the nozzle hole 2 and is a tapered hole. 4 is formed. A storage hole 6 is formed in connection with the taper hole 4 and coaxially with the nozzle hole 2, the end of the storage hole 6 is opened to the outside of the outer cylinder 1, and a screw hole 7 is formed on the opening side of the storage hole 6. Is formed. A gas inflow hole 8 communicating with the storage hole 6 is formed in the outer cylinder 1 in a direction orthogonal to the axial direction of the storage hole 6.

  A hollow cylindrical spacer member 10 is inserted into the storage hole 6 so as to abut the tapered hole 4 side end of the storage hole 6, and the outer diameter of the spacer member 10 is formed to be substantially the same as the inner diameter of the storage hole 6. Has been.

  A cylindrical member 12 is inserted into the storage hole 6 following the spacer member 10, and the gas flow path 14 is formed by a radial gap formed between the outer periphery of the cylindrical member 12 and the inner periphery of the storage hole 6. Is formed. The gas flow path 14 communicates with the gas inflow hole 8. The spacer member 10 and the cylindrical member 12 may be formed integrally.

  The inside of the cylindrical member 12 is formed in a hollow shape over the entire length in the axial direction, and a mixing chamber 16 is formed by the inside of the spacer member 10 and the inside of the cylindrical member 12. In the cylindrical member 12, a slit 18 that communicates the gas flow path 14 and the mixing chamber 16 is formed in an arc shape in the circumferential direction. In the present embodiment, as shown in FIG. 4, three slits 18 are formed at equal intervals in the circumferential direction, and are further arranged in six rows at equal intervals in the axial direction and at different phases. ing.

  An inner cylinder 20 is screwed into the screw hole 7 of the storage hole 6, and the distal end side of the inner cylinder 20 is inserted into the storage hole 6. The tip of the inner cylinder 20 is inserted into the inner periphery of the cylindrical member 12, and a tapered step portion 22 formed on the outer periphery of the inner cylinder 20 is in contact with the end of the cylindrical member 12. By screwing the inner cylinder 20 into the screw hole 7, the taper step portion 22 presses the cylindrical member 12 in the direction of the nozzle hole 2 and presses the spacer member 10 and the cylindrical member 12 in the axial direction.

  The inner cylinder 20 is formed with a liquid inflow hole 24 for supplying a liquid coaxially with the nozzle hole 2, and a connection hole communicating with the mixing chamber 16 coaxially with the nozzle hole 2 on the tip side of the inner cylinder 20. 26 is formed. The cross-sectional area of the mixing chamber 16 is formed to be larger than the cross-sectional area of the connection hole 26. Furthermore, in this embodiment, the cross-sectional area of the connection hole 26 and the cross-sectional area of the nozzle hole 2 are formed substantially the same. . The liquid inflow hole 24 and the connection hole 26 are communicated by a communication hole 28.

Next, the operation of the two-fluid nozzle of the present embodiment described above will be described.
First, the gas inflow hole 8 is connected to be supplied with a gas such as compressed air, and the liquid inflow hole 24 is connected to be supplied with a liquid such as water. The supply pressure may be set as appropriate. When the two-fluid nozzle is used in a machine tool such as a machining center, a coolant liquid or a cleaning liquid may be supplied as a liquid.

  When the liquid is supplied to the liquid inflow hole 24, the liquid flows into the mixing chamber 16 from the axial direction through the communication hole 28 and the connection hole 26. When gas is supplied to the gas inflow hole 8, the gas flows into the mixing chamber 16 from the radial direction via the gas flow path 14 and the slit 18.

  The cross-sectional area of the mixing chamber 16 is larger than the cross-sectional area of the connection hole 26, and the liquid flowing into the mixing chamber 16 and the gas flowing into the mixing chamber 16 from the radial direction through the slits 18 are mixed together. Be injected. Since the flow path resistance of the connection hole 26, the mixing chamber 16, and the nozzle hole 2 is small, the mixed fluid ejected from the nozzle hole 2 flies well. Further, even if dust or the like is mixed in the supplied liquid or gas, clogging with dust or the like is less likely to occur. Furthermore, the injection from the nozzle hole 2 can be changed by adjusting the gas supply pressure and supply amount.

  When the supply amount of gas is increased, the gas can be injected in a mist form from the nozzle hole 2, the heat of vaporization can be taken away by the mist, the temperature can be lowered, and it can be used for fire extinguishing. A male screw part 30 is formed coaxially with the nozzle hole 2 on the distal end side of the outer cylinder 1, and an attachment can be attached to the male screw part 30 to adjust the spread angle of the injected mixed fluid.

  The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

It is a front view which shows the outer cylinder of the two-fluid nozzle as one Embodiment of this invention in a cross section. It is a side view of the two-fluid nozzle of this embodiment. It is sectional drawing of the two-fluid nozzle of this embodiment. It is AA sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer cylinder 2 ... Nozzle hole 6 ... Storage hole 8 ... Gas inflow hole 12 ... Cylindrical member 14 ... Gas flow path 16 ... Mixing chamber 18 ... Slit 20 ... Inner cylinder 24 ... Liquid inflow hole 26 ... Connection hole

Claims (3)

In a two-fluid nozzle that mixes and injects liquid and gas,
A nozzle hole is formed, and an outer cylinder formed with a storage hole communicating with the nozzle hole is provided, and a gas inflow hole through which gas is supplied to the outer cylinder is formed.
A cylindrical member inserted into the storage hole and formed with a mixing chamber communicating with the nozzle hole is inserted into the storage hole with a radial gap, and the cylindrical member has the storage hole, the mixing chamber, and Forming slits that communicate with each other along the circumferential direction,
Furthermore, an inner cylinder is inserted into the storage hole, the inner cylinder is pressed against the cylindrical member in the nozzle hole direction, a liquid inflow hole for supplying a liquid to the inner cylinder is formed, and the liquid inflow hole A two-fluid nozzle characterized in that a connection hole is formed to communicate with the mixing chamber. 2. The two-fluid nozzle according to claim 1, wherein the slits are formed in an arc shape, the plurality of slits are formed on the same circumference, and a plurality of rows are formed in the axial direction of the cylindrical member. . The two-fluid nozzle according to claim 1, wherein a cross-sectional area of the mixing chamber is larger than a cross-sectional area of the connection hole.

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