WO2019065192A1 - Coating material air spray device - Google Patents

Coating material air spray device Download PDF

Info

Publication number
WO2019065192A1
WO2019065192A1 PCT/JP2018/033519 JP2018033519W WO2019065192A1 WO 2019065192 A1 WO2019065192 A1 WO 2019065192A1 JP 2018033519 W JP2018033519 W JP 2018033519W WO 2019065192 A1 WO2019065192 A1 WO 2019065192A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
paint
opening
discharge
discharged
Prior art date
Application number
PCT/JP2018/033519
Other languages
French (fr)
Japanese (ja)
Inventor
眞司 片山
義冶 横溝
政敬 光本
Original Assignee
ランズバーグ・インダストリー株式会社
長瀬産業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ランズバーグ・インダストリー株式会社, 長瀬産業株式会社 filed Critical ランズバーグ・インダストリー株式会社
Publication of WO2019065192A1 publication Critical patent/WO2019065192A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point

Definitions

  • the present invention relates to a paint air spray device.
  • Paint air spray devices that use high speed air to atomize paint are generally referred to as "paint air spray guns”.
  • a coating device which atomizes paint using a rotary atomizing head is called a "bell type coating device”.
  • Coating technology is evolving and developing in an environment that meets the demands of the automotive industry.
  • the painting of the car body is required to have high quality and work efficiency.
  • As for the working efficiency it is effective to make the paint discharge amount per unit time of the coating machine as large as possible.
  • a bell-type coating device requires a lot of shaping, and a paint air spray device requires a lot of atomizing air to atomize the paint.
  • the coating efficiency means the proportion of the paint actually used on the surface of the work out of the used paint.
  • paint efficiency means the proportion of the paint actually used on the surface of the work out of the used paint.
  • an air stream containing fine paint particles is bounced off the surface of the work. Then, as the air bounces, a phenomenon occurs in which the paint particles also bounce on the surface of the work. From this, it is common knowledge of those skilled in the art that "the working efficiency and the deposition efficiency are in a trade-off relationship".
  • Patent Document 1 discloses a paint air spray gun provided with two paint nozzles (two paint discharge holes). The paint air spray gun is attached to a painting robot and performs work under computer control.
  • Patent Document 2 discloses a paint air spray gun for electrostatic coating which arranges an electrode on the axis of a paint nozzle and applies a high voltage to the electrode.
  • Patent document 3 discloses a paint air spray gun for manual work that repairs automobile paint.
  • Patent Document 4 discloses a paint air spray gun provided with a needle valve that controls the discharge amount of paint.
  • Patent Document 5 discloses a paint air spray gun attached to a paint robot.
  • paint air spray guns guns for electrostatic coating (Patent Document 2) and non-electrostatic guns (Patent Document 3) are known.
  • the paint air spray gun comprises a first type of gun that forms a circular paint pattern (Patent Documents 2 and 4) and a second type of gun that forms a substantially elliptical paint pattern (Patent Documents 3 and 5) It has been known.
  • the first type of gun is called "round blow” type.
  • the second type of gun is referred to as a "plain blow” type.
  • reciprocators which move a plurality of paint air spray guns up and down and back and forth.
  • the paint air spray gun applied to the reciprocator is selectively adopted an electrostatic system and a non-electrostatic system.
  • the paint air spray gun is known from the viewpoints of other classifications as an internal mixing type gun described in Patent Document 3 (FIG. 5 of Patent Document 3) and an external mixing type gun (FIG. 6 of Patent Document 3). It is done.
  • FIG. 15 attached hereto is a view regarding a tip portion of a conventional external mixing type paint air spray apparatus, that is, a paint air spray gun.
  • the structure and operation of a conventional paint air spray gun will be described with reference to FIG.
  • the illustrated paint air spray device is a flat-blowing type.
  • the conventional paint air spray gun 200 has its tip end portion 202 composed of a paint nozzle main body 204 and an air cap 206 covering the tip end of the paint nozzle main body 204.
  • the tapered end of the paint nozzle portion 208 has a paint discharge hole 208a. Liquid paint is supplied to the paint nozzle portion 208 from a paint source, and paint is discharged forward from the paint discharge hole 208a.
  • the paint discharge hole 208a is circular when viewed from the front. Therefore, the paint discharged from the paint discharge hole 208a has a solid cylindrical shape.
  • the amount of the paint discharged through the paint discharge hole 208a is controlled by the needle valve 210 moving back and forth on the axis Ax of the paint nozzle portion 208.
  • the air cap 206 has a central hole 206a for receiving the tip of the paint nozzle portion 208, and the central hole 206a is located on the axis Ax.
  • the air cap 206 has atomizing air holes 214 on the outer peripheral side of the central hole 206a. Atomizing air is supplied to the atomizing air holes 214 through the air passage 212. That is, the air cap 206 has a gap Sa with the outer peripheral surface of the tip portion of the paint nozzle portion 208, and the gap Sa forms the atomization air passage 212, and the atomization air passage 212 is formed through the atomization air passage 212. Is discharged forward from the atomizing air hole 214.
  • the illustrated paint air spray gun 200 is a paint air spray apparatus of the above-described second type (flat blow type) for forming a substantially elliptical paint pattern as described above.
  • the air cap 206 has a pair of outer peripheral protrusions 220 projecting forward.
  • the pair of outer peripheral protruding portions 220 are positioned so as to oppose each other in the radial direction across the axis Ax.
  • the outer circumferential protruding portion 220 has a pattern air hole 220 a opened toward the axis Ax, and the pattern air is supplied to the pattern air hole 220 a through the pattern air passage 222.
  • a substantially elliptical coating pattern is formed by the pattern air discharged from the pattern air hole 220a.
  • the liquid paint is discharged from the paint discharge hole 208a.
  • atomization air is discharged from atomization air holes 214 located adjacent to the paint discharge holes 208 a and located on the outer periphery thereof.
  • the paint is discharged toward the work W at a speed of, for example, 1 m / s from the paint discharge hole 208a.
  • the atomization air discharged from the atomization air holes 214 collides with the paint at a subsonic velocity of, for example, 200 m / s.
  • the atomization air discharged from the atomization air holes 214 has a negative pressure on the inner peripheral side.
  • pattern air is discharged from the pattern air holes 220a of the pair of outer peripheral protruding portions 220 located opposite to each other.
  • the pattern air contributes to making the coating pattern substantially elliptical while further atomizing the paint in the pattern forming area 232 in front of the atomization area 230.
  • the paint air spray gun atomizes the paint using high speed atomizing air as described above.
  • the atomizing air transports the paint toward the work while atomizing it.
  • the atomizing air is repelled by the workpiece. From this, convection occurs on the surface of the work, and an air flow moving away from the work toward the outer periphery is generated. This outward moving air stream is accompanied by paint particles. Then, the paint particles moving to the outer peripheral side scatter around without adhering to the work. Therefore, a part of the paint discharged from the paint air spray gun is wasted without adhering to the work.
  • the ratio of the amount of paint discharged from the paint air spray gun to the amount of paint adhering to the work is called "coating efficiency".
  • coating efficiency the ratio of the amount of paint discharged from the paint air spray gun to the amount of paint adhering to the work.
  • An object of the present invention is to provide a paint air spray device capable of improving the coating efficiency while securing desired atomization to a paint.
  • a paint nozzle unit which has an axis and is supplied with liquid paint from a paint source;
  • An air discharge member disposed coaxially with the axis in the paint nozzle and supplied with atomized air;
  • a front view ring-shaped paint discharge opening for discharging the liquid paint supplied from a paint passage formed on the outer peripheral side of the air discharge member in the paint nozzle portion;
  • the air discharge member has a second air opening at its front end, and the atomized air is discharged from the second air opening. This is achieved by providing a paint air spray device.
  • the paint discharged forward through the ring-shaped paint discharge opening is a hollow cylindrical shape.
  • the paint discharged from the conventional paint air spray device has a solid cylindrical shape as described above. Therefore, the paint discharged from the paint air spray device according to the present invention is "thin" compared to the prior art.
  • the paint air spray apparatus not only atomization air is discharged from the first air opening on the outer peripheral side to the "thin" hollow cylindrical paint but also the hollow cylinder
  • the atomized air is discharged from the second air opening also on the inner peripheral side of the second paint. Therefore, the paint can be atomized by the atomizing air (outer side air) passing through the outside and the atomizing air (inner side air) passing inside through the thin paint.
  • the paint air spray apparatus (1) thins the paint to be discharged, and (2) atomizes the air not only on the outer peripheral side of the "thin" paint but also on the inner peripheral side (3). Let it pass. Thereby, the efficiency of the atomization of the paint using air can be dramatically improved.
  • the amount of air required to achieve the same conventional atomization can be significantly reduced. Thereby, the coating efficiency can be improved.
  • the energy colliding with the surface of the work decreases. This reduces the amount of paint that does not adhere to the surface of the workpiece, such as being bounced off the surface of the workpiece. Therefore, the loss of paint can be drastically reduced. That is, the coating efficiency can be improved. Furthermore, if the energy of the air colliding with the surface of the work is small, the paint air spray device can be brought close to the work to perform the painting operation. If this is called "proximity coating", the coating efficiency can be further enhanced by the proximity coating.
  • a plurality of paint air spray devices according to the present invention may be installed on a single paint robot and proximity paint may be further performed. Thereby, the coating efficiency can be enhanced while securing high work efficiency.
  • FIG. Figure 2 is a front view of the paint air spray gun illustrated in Figure 1; It is sectional drawing of the front-end
  • FIG. 1 is an overall configuration diagram of a liquid paint spray system. It is sectional drawing of the front-end
  • FIG. 1 to FIG. 4 are drawings of the external mixing type paint air spray gun of the first embodiment.
  • FIG. 1 is a cross-sectional view of a tip portion of a paint air spray gun.
  • FIG. 2 is an enlarged cross-sectional view of a portion indicated by arrow A (1) in FIG.
  • FIG. 3 is a front view of the paint air spray gun shown in FIG.
  • FIG. 4 shows a hollow pipe made of corrosion-resistant metal (stainless steel) which constitutes the tip of an air discharge member which is one of the main parts.
  • the tip 2 of the paint air spray gun 100 includes a paint nozzle body 4, an air cap 6 covering the tip of the paint nozzle body 4, and a paint nozzle body 4. And an air discharge member 8 disposed on the axis Ax of the paint nozzle main body 4.
  • the illustrated paint air spray gun 100 is a paint air spray apparatus of the second type described above that forms a substantially elliptical paint pattern.
  • the air cap 6 has a pair of outer peripheral protrusions 10 projecting forward as in the prior art.
  • the pair of outer peripheral protrusions 10 are located opposite to each other with the axis Ax interposed therebetween.
  • the outer peripheral protrusion 10 has a pattern air hole 10a opened toward the axis Ax, and pattern air is supplied to the pattern air hole 10a through the pattern air supply passage 12, and the pattern air hole is the same as in the prior art.
  • the pattern air is discharged obliquely forward from the axis 10a toward the axis Ax.
  • a substantially elliptical paint pattern is formed by the pattern air.
  • the paint air spray gun 100 has a first air supply passage 14 between the paint nozzle body 4 and the air cap 6.
  • a central hole 16 centered on the axis Ax is formed in the tip end surface of the air cap 6. The tip end portion of the paint nozzle portion 18 of the paint nozzle main body 4 is inserted into the central hole 16.
  • a circular ring-shaped first air opening 20 continuously extending in the circumferential direction is formed between the central hole 16 and the outer peripheral surface of the paint nozzle portion 18, and the first air opening 20 is atomized air Is supplied.
  • the first air opening 20 is formed between the outer peripheral surface of the paint nozzle portion 18 and the air cap 6, the first air opening 20 approaches the paint in the circumferential direction as compared to the prior art.
  • the first atomizing air (outer side air) can be discharged in a continuous ring state.
  • reference numeral 22 denotes a first auxiliary air hole (FIG. 3)
  • reference numeral 24 denotes a second auxiliary air hole.
  • the first and second auxiliary air holes 22 and 24 are conventionally known. It is optional whether the paint air spray gun 100 is provided with the first and second auxiliary air holes 22 and 24.
  • a total of two first auxiliary air holes 22 are provided (FIG. 3).
  • the pair of first auxiliary air holes 22 are disposed opposite to each other on an imaginary line which is orthogonal to an imaginary line connecting the pair of pattern air holes 10a located opposite to each other and passes the axis of the air discharging member 8 ing.
  • the air discharged from the pair of first auxiliary air holes 22 mainly contributes to the atomization of the paint.
  • second auxiliary air holes 24 are constituted by two pairs of air holes (four in total) arranged on an imaginary line connecting pairs of pattern air holes 10a located opposite to each other. It is done. The air discharged from the two pairs of second auxiliary air holes 24 contributes to suppressing the contamination of the tip of the paint air spray gun 100 by the paint.
  • the air discharge member 8 is formed of a hollow tube made of a corrosion resistant material and arranged coaxially with the axis Ax.
  • FIG. 4 shows a hollow pipe having a circular cross section which constitutes the tip portion of the air discharge member 8. This hollow pipe is made of stainless steel.
  • the illustrated hollow pipe has the same cross-sectional area from one longitudinal end to the other.
  • the hollow pipe, that is, the air discharge member 8 has a length which penetrates the tip center hole 32 of the paint nozzle portion 18 and protrudes forward of the paint nozzle portion 18, that is, the work W side (FIG. 1).
  • the air discharge member 8 forms a ring-shaped paint discharge opening 34 continuously extending in the circumferential direction by the outer peripheral surface thereof and the paint nozzle portion 18, and the air discharge member 8 has a second air inside thereof.
  • a passage 36 is formed.
  • the second air passage 36 is supplied with atomized air.
  • the paint passage 38 (FIG. 1) is supplied with liquid paint from a paint source (not shown), and liquid paint is supplied to the paint discharge opening 34 through the paint passage 38.
  • the paint discharge opening 34 has a circular ring shape in a front view, and the liquid paint is discharged forward through the paint discharge opening 34.
  • the liquid paint discharged from the paint discharge opening 34 has a hollow cylindrical shape (FIG. 7).
  • the air discharge member 8 can move forward and backward along the axis Ax to open and close the paint discharge opening 34.
  • the air discharge member 8 has a tapered surface 8b (FIG. 1) near its tip.
  • the inner peripheral surface of the paint nozzle main body 4 has a valve seat 4a formed of a tapered surface.
  • the tapered surface 8 b and the valve seat 4 a constitute an on-off valve for liquid paint passing through the paint passage 38.
  • the air discharge member 8 moves forward, and the tapered surface 8b abuts on the valve seat 4a, whereby the supply of the paint to the paint discharge opening 34 is stopped.
  • the air discharge member 8 moves backward and the tapered surface 8b separates from the valve seat 4a, the paint is supplied to the paint discharge opening 34, and the paint is discharged from the paint discharge opening 34.
  • the middle portion in the longitudinal direction of the air discharge member 8 may be fixed to the paint nozzle main body 4 so as to be movable back and forth.
  • a valve for controlling the amount of paint supplied to the paint passage 38 may be separately prepared.
  • the front end opening 8a of the air discharge member 8 is circular in a front view, and is open forward. Atomized air is supplied to the second air passage 36 formed by the air discharge member 8. Then, the atomized air is discharged forward through the front end opening 8a (second air opening).
  • the liquid paint discharged from the paint air spray gun 100 of the first embodiment has a hollow cylindrical shape.
  • the paint air spray gun 100 has a first air opening 20 in the form of a circular ring in a front view that is adjacent to the paint discharge opening 34 and located on the outer peripheral side of the paint discharge opening 34.
  • the first air is discharged forward through the The first air passes through the outer peripheral side of the hollow cylindrical liquid paint.
  • the paint air spray gun 100 further includes a front end opening 8a (second air opening) having a front view circular shape and located adjacent to the paint discharge opening 34 and located on the inner peripheral side of the paint discharge opening 34.
  • Second air is discharged forward through the front end opening 8a (second air opening), and the second air passes through the inner peripheral side of the hollow cylindrical liquid paint.
  • Second embodiment flat blow type
  • FIG. 5 shows the external mixing paint air spray gun 120 of the second embodiment.
  • the illustrated paint air spray gun 120 is also a modified example of the paint air spray gun 100 (FIGS. 1 to 4) of the first embodiment described above. Therefore, in the description of the paint air spray gun 120 of the second embodiment, substantially the same elements as those of the paint air spray gun 100 of the first embodiment are designated by the same reference numerals, and the description thereof is omitted.
  • the first and second auxiliary air holes 22 and 24 shown in FIG. 3 and the like are omitted. Further, the front end opening 8a (second air opening) of the air discharging member 8 for discharging the second air does not protrude forward.
  • the front end opening 8a is open in substantially the same plane as the first air opening 20 for discharging the first air.
  • the paint air spray gun 120 of the second embodiment may also be provided with first and second auxiliary air holes 22 and 24 shown in FIG.
  • the front end opening 8a of the air discharge member 8 may be protruded forward as in the first embodiment. This can also be said about the first embodiment described above.
  • the front end opening 8a (second air opening) of the air discharge member 8 is opened in substantially the same plane as the first air opening 20, as in the second embodiment. It is also good.
  • FIG. 6 is a diagram in which the air discharge member 8 included in the second embodiment is extracted.
  • Reference numeral 40 shown in FIGS. 5 and 6 denotes a needle electrode.
  • the paint air spray gun 120 of the second embodiment is a spray gun for electrostatic coating.
  • the electrode 40 is preferably a needle electrode.
  • the needle electrode 40 is disposed on the axis of a hollow pipe that constitutes the tip of the air discharge member 8, and the needle electrode 40 projects forward from the air discharge member 8.
  • the diameter of the needle electrode 40 is smaller than the inner diameter of the hollow pipe, and a second air passage 36 is formed by the gap between the needle electrode 40 and the hollow pipe, and atomization air can pass through the gap. .
  • the second air is discharged forward from the front end opening 8 a (a shape of a circular ring in a front view) whose inner peripheral side is defined by the needle electrode 40.
  • the paint air spray gun 120 can be changed to a non-electrostatic spray gun.
  • FIG. 7 is a view for explaining the operation and effect of the first embodiment (FIGS. 1 to 4). This description is substantially applicable to the second embodiment described with reference to FIG.
  • the first air passes through the outer peripheral side of the thin hollow cylindrical liquid paint Pt (L1) discharged from the paint air spray gun 100 described above with reference to FIG. 1 and the like. .
  • This first air is referred to as "outer side air Ar (out)”.
  • the second air passes through the inner peripheral side of the hollow cylindrical liquid paint Pt (L1).
  • the second air is referred to as “inner side air Ar (in)”.
  • the thin hollow cylindrical liquid paint is sandwiched by the outer side air Ar (out) and the inner side air Ar (in). It is atomized in the cold state.
  • the reference sign Pt (p) indicates a paint in an atomized state. Further, the thickness of the hollow cylindrical liquid paint Pt (L1) is illustrated with a reference numeral "Th".
  • FIG. 8 shows a solid cylindrical liquid paint Pt (L2) discharged from a conventional paint air spray apparatus as a comparative example.
  • the liquid paint Pt (L2) is discharged from the paint nozzle portion 208 (FIG. 15) included in the conventional paint air spray apparatus 200 in a solid cylindrical shape.
  • the diameter of the solid cylindrical liquid paint Pt (L2) is shown by the reference symbol "D".
  • the dimensions of the thickness Th of the hollow cylindrical liquid paint Pt (L1) (FIG. 7) related to the embodiments. Is smaller than the dimension of the diameter D of the conventionally related solid cylindrical liquid paint Pt (L2) (FIG. 8). That is, the hollow cylindrical liquid paint Pt (L1) (FIG. 7) associated with the example is thin. Then, the outer peripheral side of the thin liquid paint Pt (L1) can be atomized by the outer peripheral air Ar (out) (first air). In addition to this, the inner peripheral side of the hollow cylindrical liquid paint Pt (L1) can be atomized by the inner peripheral air Ar (in) (second air).
  • the hollow cylindrical liquid paint Pt (L1) sandwiched by the outer air Ar (out) and the inner air Ar (in) is atomized not only by the outer circumference but also by the air at the inner circumference. It will be. And this cylindrical liquid paint Pt (L1) is thinner than before as mentioned above.
  • the air discharge member 8 is opened in the same plane as the paint discharge opening 34. Also in the second embodiment, the air discharge member 8 may be projected forward of the paint discharge opening 34 as in the first embodiment. Also in the paint air spray gun 120 of the second embodiment, the liquid paint is discharged in a thin-walled hollow cylindrical shape as in the first embodiment. Then, with respect to the hollow cylindrical liquid paint Pt (L1), the outer peripheral air Ar (out) passes through the outer peripheral side, and further, the inner peripheral air Ar (in) passes through the inner peripheral side. The paint atomized by the outer side air Ar (out) and the inner side air Ar (in) is charged by the high voltage applied to the needle electrode 40.
  • Third embodiment round blow type
  • FIG. 9 is a cross-sectional view of the tip portion of the external mixing type paint air spray gun 130 of the third embodiment.
  • the illustrated paint air spray gun 130 is a paint air spray apparatus of the first type (round blow) for forming a circular paint pattern.
  • the air cap 6 forms a ring-shaped first air opening 20 which is continuous in the circumferential direction when viewed from the front, between the air cap 6 and the tip end portion of the paint nozzle portion 18 inserted into the central hole 16.
  • An air discharge member 132 is inserted into the inside of the paint nozzle portion 18, and the air discharge member 132 is disposed coaxially with the axis Ax of the paint nozzle portion 18.
  • the air discharge member 132 forms a cylindrical paint passage 38 between itself and the paint nozzle main body 4 on the outer peripheral side.
  • the air discharge member 132 forms a circular ring-like paint discharge opening 34 in a front view between the end of the paint nozzle portion 18 and the paint discharge nozzle portion 18, and the paint discharge opening 34 is a paint passage as in the first embodiment. It leads to 38.
  • the air discharge member 132 is composed of first and second two molded articles 134 and 136, and the first and second molded articles 134 and 136 are made of a conductive and corrosion resistant material (typically stainless steel). It is made by).
  • a conductive and corrosion resistant material typically stainless steel
  • the first molded product 134 penetrates the paint nozzle portion 18.
  • the front end portion 134a of the first molded product 134 has a cylindrical shape opened forward, and the cylindrical paint passage 38 is formed on the circumferential surface of the front end portion 134a.
  • a portion of the tip end portion 134 a of the first molded product 134 is positioned so as to project forward from the paint nozzle portion 18.
  • the front end surface 134b of the first molded product 134 has a circular ring shape in a front view, and the front end surface 134b is inclined forward at an angle ⁇ with respect to the axis Ax.
  • the second molded product 136 is attached to the tip opening of the first molded product 134.
  • the second molded product 136 has a tapered shape, and an electrode 138 is formed extending further forward from the center of the tapered tip 136a. That is, the paint air spray gun 130 of the third embodiment is an electrostatic gun having an electrode 138 to which a high voltage is applied. Alternatively, the paint air spray gun 130 can be changed to a non-electrostatic gun without the electrode 138.
  • the second molded product 136 is a member that closes the end of the second air passage 36 formed by the internal space of the first molded product 134.
  • the second molded product 136 also has a rear end surface 136b opposed to the inclined front end surface 134b of the first molded product 134, and the rear end surface 136b is an inclination angle ⁇ of the front end surface 134b of the first molded product 134. In this example, it is inclined at the same angle as 60 °).
  • the second molded product 136 (rear end surface 136b) cooperates with the first molded product 134 (tip surface 134b) to form a circumferentially continuous second air opening 140, and an angle ⁇ (this embodiment (60 °) forms an inclined air outlet passage 142.
  • the second air opening 140 is located at a position spaced forward from the paint discharge opening 34.
  • a method of “press-fitting” is adopted for assembling the second molded product 136 with respect to the first molded product 134.
  • the operation of the paint air spray gun 130 of the third embodiment will be described with reference to FIG.
  • the liquid paint is discharged forward from the paint discharge opening 34 in a hollow cylindrical shape as in the first and second embodiments.
  • the paint air spray gun 130 has a first air opening 20 in the shape of a circular ring in a front view adjacent to the paint discharge opening 34 and located on the outer peripheral side of the paint air spray gun 130.
  • the outer peripheral air Ar (out) first air
  • the paint air spray gun 130 of the third embodiment has a circumferentially continuous second air opening 140 located forward of the paint discharge opening 34, and a diameter at an angle ⁇ from the second air opening 140.
  • the inner side air Ar (in) (second air) is discharged outward in the direction and obliquely forward.
  • the inner circumferential air Ar (in) atomizes the paint while crossing the hollow cylindrical liquid paint Pt (L1) diagonally forward. Therefore, the inner air Ar (in) directs the paint radially outward and obliquely forward while atomizing the paint.
  • the outer peripheral air Ar (out) is directed forward.
  • the paint atomized by the inner circumferential air Ar (in) is further atomized by the outer circumferential air Ar (out). Then, a circular coating pattern is formed by the cooperation of the inner circumferential air Ar (in) and the outer circumferential air Ar (out).
  • the outer peripheral air Ar (out) (first air) forms an air curtain along the outer peripheral surface of the hollow cylindrical liquid paint Pt (L1) discharged from the paint discharge opening 34 so that the paint is in the radial direction It turned out that it is better to contribute to preventing the spread outward. According to this, regarding paint atomization, it is better to adjust and design the parameter so that the contribution rate of the inner side air Ar (in) becomes larger than the outer side air Ar (out) I understand.
  • the second air opening 140 for discharging the inner peripheral air Ar (in) is located at a position away from the paint discharge opening 34 in the forward direction. This is because, at the point where the second air (inner circumferential side air Ar (in)) discharged from the second air opening 140 collides with the liquid paint Pt (L1), the energy of the liquid paint Pt (L1) goes forward Is attenuated. Therefore, by disposing the second air opening 140 at a position away from the paint discharge opening 34, it becomes easy to make the paint atomization and the coating pattern circularly expanded in the radial direction.
  • the paint air spray gun 130 of the third embodiment described above with reference to FIG. 9 is provided with a plurality of shaping air holes 146 (FIG. 9) on the outer peripheral side of the first air opening 20.
  • 11 to 13 are diagrams for explaining the shaping air holes 146 and the shaping air Sair discharged from the shaping air holes 146.
  • FIG. FIG. 11 is a front view of the paint air spray gun 130.
  • FIG. 12 is a side view of the tip of the paint air spray gun 130.
  • FIG. 13 is a perspective view for explaining the shaping air Sair.
  • the paint air spray gun 130 has a plurality of shaping air holes 146 at the outer peripheral portion of the air cap 6.
  • the shaping air holes 146 are arranged at equal intervals concentrically about the axis Ax.
  • the diameter of the circular coating pattern can be defined by the shaping air Sair discharged from the shaping air hole 146. Further, in the design of the paint air spray gun 130, the first air (outer side air Ar (out)) discharged from the first air opening 20, and the second air (inner side air Ar (discharged) from the second air opening 140. The diameter of the coating pattern can be adjusted by adjusting the respective discharge amounts of the shaping air Sair discharged from the shaping air hole 146).
  • the second air inner peripheral air Ar (in) discharged from the second air opening 140, and the shaping air hole 146
  • the diameter of the coating pattern can be controlled by controlling the discharge amount of the shaping air Sair to be discharged.
  • the shaping air hole 146 preferably discharges the shaping air Sair inclined at, for example, 45 ° clockwise or counterclockwise around the axis Ax when the paint air spray gun 130 is viewed from the front, Designed.
  • the shaping air Sair discharged from the plurality of shaping air holes 146 creates a flow like twisting in the same direction, that is, a pseudo swirl flow.
  • the shaping air Sair in a twisted state is effective in producing the desired circular coating pattern and effective in atomizing the paint.
  • the first air opening 20 adjacent to the paint discharge opening 34 and located on the outer peripheral side of the paint discharge opening 34 has a circumferential shape as in the first and second embodiments. It has a front view circular ring shape continuous in the direction.
  • the first air openings 20 may be configured by a plurality of air holes arranged at equal intervals concentrically around the axis Ax.
  • a plurality of air holes are designed to discharge the outer peripheral air Ar (out) in a state of being twisted at an angle of, for example, 45 ° clockwise or counterclockwise around the axis Ax You may In order to form the outer circumferential air Ar (out) in a twisted state, the directions of the inclination angles of the plurality of air holes constituting the first air opening 20 are the same as the twisting direction of the shaping air hole 146 described above. It may be in the opposite direction.
  • Spray coating in which liquefied carbon dioxide is mixed in liquid paint is known.
  • the amount of thinner used can be reduced by mixing liquefied carbon dioxide (CO 2) gas into the liquid paint.
  • the paint viscosity can be reduced by liquefied carbon dioxide gas, and the paint can be atomized as the liquefied carbon dioxide gas is vaporized.
  • the fourth embodiment shown in FIG. 14 includes the paint air spray guns 100, 120, 130 of the first to third embodiments, and in these guns 100, 120, 130, gaseous CO 2 gas is mixed.
  • 1 is a system 150 for producing paint.
  • the liquid paint spray system 150 has a mixer 152 for mixing gaseous CO 2 into the paint, and the mixer 152 mixes the gaseous paint CO 2 into the liquid paint from the paint source, and the liquid paint containing CO 2 gas is Paint air spray guns 100, 120, 130 are supplied to the paint passage 38.
  • paint nozzle main body 8 air discharge member 8a front end opening (second air opening) of air discharge member included in the first embodiment 18 paint nozzle portion 20 first air opening (outer side air opening) 34 ring-shaped paint discharge opening 38 paint passage 132 air discharge member included in the third embodiment 140 second air opening of air discharge member included in the third embodiment 142 second air opening included in the third embodiment And the air outlet passage inclined at an angle ⁇ 146 shaping air hole Ax included in the third embodiment axis of the paint nozzle portion Ar (out) peripheral air discharged from the first air opening Ar (in) second air opening Inner air side Air Sair shaping air discharged from

Abstract

The purpose of the present invention is to achieve both coating efficiency improvement and atomization of coating material. An air spray gun 100 has an air discharge member 8 disposed within a coating material nozzle unit 18. The air discharge member 8 is disposed on the same axis as an axial line Ax for the coating material nozzle unit 18. The air discharge member 8 discharges atomized air from a front end opening 8a. A coating material discharge opening 34 is formed between the coating material nozzle unit 18 and the air discharge member 8. The coating material discharge opening 34 has a ring shape continuing in the circumferential direction, and coating material discharged from the coating material discharge opening 34 has a hollow cylindrical shape. The air spray gun 100 has a first air opening 20 formed by the coating material nozzle unit 18 and an air cap 6, and the first air opening 20 has a ring shape continuing in the circumferential direction. Atomized air is discharged forward from the first air opening 20.

Description

塗料エアスプレー装置Paint air spray device
　本発明は塗料エアスプレー装置に関する。 The present invention relates to a paint air spray device.
　高速エアを使って塗料を霧化する塗料エアスプレー装置は一般的に「塗料エアスプレーガン」と呼ばれている。これに対して、回転霧化頭を使って塗料を霧化する塗装装置は、「ベル型塗装装置」と呼ばれている。 Paint air spray devices that use high speed air to atomize paint are generally referred to as "paint air spray guns". On the other hand, a coating device which atomizes paint using a rotary atomizing head is called a "bell type coating device".
　塗装技術は、自動車業界からの要請に応じる環境下で進化及び発展している。自動車のボディの塗装は高度な品質が求められ、また、作業効率が求められる。作業効率は、塗装機の単位時間当たりの塗料吐出量をできるだけ多くするのが効果的である。しかし、塗料吐出量を多くすると、ベル型塗装装置であれば沢山のシェーピングが必要となり、また、塗料エアスプレー装置であれば、塗料を微粒化するのに沢山の霧化エアが必要となる。 Coating technology is evolving and developing in an environment that meets the demands of the automotive industry. The painting of the car body is required to have high quality and work efficiency. As for the working efficiency, it is effective to make the paint discharge amount per unit time of the coating machine as large as possible. However, when the paint discharge amount is increased, a bell-type coating device requires a lot of shaping, and a paint air spray device requires a lot of atomizing air to atomize the paint.
　ワーク（被塗物）を塗装するのに多量のエアを使うと、これに伴って塗着効率が低下するという新たな問題が発生する。「塗着効率」とは、使用した塗料のうち、実際にワークの表面に付着した塗料の割合を意味する。多量のエアを使って塗装すると、微細な塗料粒子を含むエア流がワークの表面で跳ね返される。そして、このエアの跳ね返りに伴って塗料粒子もワークの表面で跳ね返される現象が生じる。このことから、「作業効率と塗着効率とは二律背反の関係にある。」というのが当業者の常識である。 When a large amount of air is used to paint a work (coated object), a new problem arises that the coating efficiency is reduced. The "coating efficiency" means the proportion of the paint actually used on the surface of the work out of the used paint. When painting with a large amount of air, an air stream containing fine paint particles is bounced off the surface of the work. Then, as the air bounces, a phenomenon occurs in which the paint particles also bounce on the surface of the work. From this, it is common knowledge of those skilled in the art that "the working efficiency and the deposition efficiency are in a trade-off relationship".
　特許文献１は、２つの塗料ノズル（２つの塗料吐出孔）を備えた塗料エアスプレーガンを開示している。この塗料エアスプレーガンは塗装ロボットに取り付けられて、コンピュータ制御によって作業を行う。特許文献２は、塗料ノズルの軸線上に電極を配置し、この電極に高電圧を印加しながら塗装を行う静電塗装用の塗料エアスプレーガンを開示している。特許文献３は、自動車の塗装を補修する、手作業用の塗料エアスプレーガンを開示している。特許文献４は、塗料の吐出量を制御するニードル弁を備えた塗料エアスプレーガンを開示している。特許文献５は、塗装ロボットに取り付けられる塗料エアスプレーガンを開示している。 Patent Document 1 discloses a paint air spray gun provided with two paint nozzles (two paint discharge holes). The paint air spray gun is attached to a painting robot and performs work under computer control. Patent Document 2 discloses a paint air spray gun for electrostatic coating which arranges an electrode on the axis of a paint nozzle and applies a high voltage to the electrode. Patent document 3 discloses a paint air spray gun for manual work that repairs automobile paint. Patent Document 4 discloses a paint air spray gun provided with a needle valve that controls the discharge amount of paint. Patent Document 5 discloses a paint air spray gun attached to a paint robot.
　塗料エアスプレーガンは、静電塗装用のガン（特許文献２）と、非静電ガン（特許文献３）とが知られている。また、塗料エアスプレーガンは、円形の塗装パターンを形成する第１方式のガン（特許文献２、４）と、略楕円の塗装パターンを形成する第２方式のガン（特許文献３、５）とが知られている。第１方式のガンは、「丸吹き」タイプと呼ばれている。第２方式のガンは、「平吹き」タイプと呼ばれている。 As paint air spray guns, guns for electrostatic coating (Patent Document 2) and non-electrostatic guns (Patent Document 3) are known. In addition, the paint air spray gun comprises a first type of gun that forms a circular paint pattern (Patent Documents 2 and 4) and a second type of gun that forms a substantially elliptical paint pattern (Patent Documents 3 and 5) It has been known. The first type of gun is called "round blow" type. The second type of gun is referred to as a "plain blow" type.
　工業製品を対象とする一般塗装の分野では、複数の塗料エアスプレーガンを上下及び前後に移動させるレシプロケータが知られている。このレシプロケータに適用される塗料エアスプレーガンは静電方式と非静電方式が選択的に採用される。 In the field of general coatings intended for industrial products, reciprocators are known which move a plurality of paint air spray guns up and down and back and forth. The paint air spray gun applied to the reciprocator is selectively adopted an electrostatic system and a non-electrostatic system.
　塗料エアスプレーガンは、他の分類の観点から、特許文献３に記載の内部混合方式のガン（特許文献３の図５）と、外部混合方式のガン（特許文献３の図６）とが知られている。 The paint air spray gun is known from the viewpoints of other classifications as an internal mixing type gun described in Patent Document 3 (FIG. 5 of Patent Document 3) and an external mixing type gun (FIG. 6 of Patent Document 3). It is done.
　ここに添付の図１５は、従来の外部混合方式の塗料エアスプレー装置つまり塗料エアスプレーガンの先端部分に関する図である。図１５を参照して、従来の塗料エアスプレーガンの構造及び作用を説明する。図示の塗料エアスプレー装置は平吹きタイプである。図１５を参照して、従来の塗料エアスプレーガン２００は、その先端部２０２が、塗料ノズル本体２０４と、塗料ノズル本体２０４の先端部を覆うエアキャップ２０６とで構成されている。塗料ノズル部２０８の先細りの先端は塗料吐出孔２０８aを有する。塗料ノズル部２０８には、塗料源から液体塗料が供給され、そして、塗料吐出孔２０８aから塗料が前方に向けて吐出される。塗料吐出孔２０８aは正面視したときに円形である。したがって、塗料吐出孔２０８aから吐出された塗料は中実の円柱状の形を有している。なお、塗料吐出孔２０８aを通じて吐出される塗料の量は、塗料ノズル部２０８の軸線Ａx上を前後動するニードル弁２１０によって制御される。 FIG. 15 attached hereto is a view regarding a tip portion of a conventional external mixing type paint air spray apparatus, that is, a paint air spray gun. The structure and operation of a conventional paint air spray gun will be described with reference to FIG. The illustrated paint air spray device is a flat-blowing type. Referring to FIG. 15, the conventional paint air spray gun 200 has its tip end portion 202 composed of a paint nozzle main body 204 and an air cap 206 covering the tip end of the paint nozzle main body 204. The tapered end of the paint nozzle portion 208 has a paint discharge hole 208a. Liquid paint is supplied to the paint nozzle portion 208 from a paint source, and paint is discharged forward from the paint discharge hole 208a. The paint discharge hole 208a is circular when viewed from the front. Therefore, the paint discharged from the paint discharge hole 208a has a solid cylindrical shape. The amount of the paint discharged through the paint discharge hole 208a is controlled by the needle valve 210 moving back and forth on the axis Ax of the paint nozzle portion 208.
　エアキャップ２０６は、塗料ノズル部２０８の先端を受け入れる中心孔２０６aを有し、この中心孔２０６aは軸線Ａx上に位置している。 The air cap 206 has a central hole 206a for receiving the tip of the paint nozzle portion 208, and the central hole 206a is located on the axis Ax.
　エアキャップ２０６は中心孔２０６aの外周側に霧化エア孔２１４を有している。この霧化エア孔２１４にはエア通路２１２を通じて霧化エアが供給される。すなわち、エアキャップ２０６は、塗料ノズル部２０８の先端部分の外周面との間に隙間Ｓaを有し、この隙間Ｓaによって霧化エア通路２１２が形成され、そして霧化エア通路２１２を通じて霧化エアが霧化エア孔２１４から前方に向けて吐出される。 The air cap 206 has atomizing air holes 214 on the outer peripheral side of the central hole 206a. Atomizing air is supplied to the atomizing air holes 214 through the air passage 212. That is, the air cap 206 has a gap Sa with the outer peripheral surface of the tip portion of the paint nozzle portion 208, and the gap Sa forms the atomization air passage 212, and the atomization air passage 212 is formed through the atomization air passage 212. Is discharged forward from the atomizing air hole 214.
　図示の塗料エアスプレーガン２００は、前述したように略楕円の塗装パターンを形成する上記第２方式（平吹きタイプ）の塗料エアスプレー装置である。エアキャップ２０６は、前方に向けて突出した一対の外周突出部２２０を有する。一対の外周突出部２２０は、軸線Ａxを挟んで径方向に互いに対抗して位置している。外周突出部２２０は、軸線Ａxに向けて開口したパターンエア孔２２０aを有し、パターンエア孔２２０aには、パターンエア通路２２２を通じてパターンエアが供給される。パターンエア孔２２０aから吐出されるパターンエアによって略楕円の塗装パターンが形成される。 The illustrated paint air spray gun 200 is a paint air spray apparatus of the above-described second type (flat blow type) for forming a substantially elliptical paint pattern as described above. The air cap 206 has a pair of outer peripheral protrusions 220 projecting forward. The pair of outer peripheral protruding portions 220 are positioned so as to oppose each other in the radial direction across the axis Ax. The outer circumferential protruding portion 220 has a pattern air hole 220 a opened toward the axis Ax, and the pattern air is supplied to the pattern air hole 220 a through the pattern air passage 222. A substantially elliptical coating pattern is formed by the pattern air discharged from the pattern air hole 220a.
　上述したように塗料吐出孔２０８aから液体塗料が吐出される。また、塗料吐出孔２０８aに隣接して且つその外周に位置する霧化エア孔２１４から霧化エアが吐出される。塗料吐出孔２０８aから例えば１m/sの速度で塗料がワークＷに向かって吐出される。この塗料に対して、霧化エア孔２１４から吐出される霧化エアは、例えば200m/sの亜音速の速度で塗料と衝突する。霧化エア孔２１４から吐出される霧化エアは、その内周側が負圧になる。この負圧によって、霧化エアは、塗料吐出孔２０８aから吐出される中実の円柱状の塗料に引き寄せられ、そして、霧化エアは円柱状塗料の外周面を削りながら塗料を小さな粒子に変化させる。この現象は、「塗料の微粒化」又は「塗料の霧化」と呼ばれている。この霧化現象が発生する領域を参照符号２３０で図示してある。 As described above, the liquid paint is discharged from the paint discharge hole 208a. In addition, atomization air is discharged from atomization air holes 214 located adjacent to the paint discharge holes 208 a and located on the outer periphery thereof. The paint is discharged toward the work W at a speed of, for example, 1 m / s from the paint discharge hole 208a. For this paint, the atomization air discharged from the atomization air holes 214 collides with the paint at a subsonic velocity of, for example, 200 m / s. The atomization air discharged from the atomization air holes 214 has a negative pressure on the inner peripheral side. By this negative pressure, the atomizing air is attracted to the solid columnar paint discharged from the paint discharge hole 208a, and the atomizing air changes the paint into small particles while scraping the outer peripheral surface of the cylindrical paint. Let This phenomenon is called "mineralization of paint" or "atomization of paint". The area where this atomization phenomenon occurs is indicated by reference numeral 230.
　この塗料エアスプレーガン２００においては、平吹きタイプであることから、互いに対抗して位置する一対の外周突出部２２０のパターンエア孔２２０aからパターンエアが吐出される。このパターンエアは、霧化領域２３０の前方のパターン形成領域２３２で塗料を更に微粒化しながら塗装パターンを略楕円にするのに寄与する。 In the paint air spray gun 200, since it is a flat-blowing type, pattern air is discharged from the pattern air holes 220a of the pair of outer peripheral protruding portions 220 located opposite to each other. The pattern air contributes to making the coating pattern substantially elliptical while further atomizing the paint in the pattern forming area 232 in front of the atomization area 230.
　塗料エアスプレーガンは、上述したように高速の霧化エアを使って塗料の霧化が行われる。この霧化エアは塗料を微粒化しながらワークに向けて搬送する。塗料粒子を伴う霧化エアがワークに衝突すると、霧化エアはワークによって跳ね返される。このことから、ワークの表面で対流が発生し、また、ワークを避けて外周側に向けて移動する気流が発生する。この外側に向けて移動する気流は塗料粒子を伴う。そして、外周側に移動する塗料粒子はワークに付着することなく周囲に飛散する。したがって、塗料エアスプレーガンから吐出される塗料の一部はワークに付着しないで無駄になる。 The paint air spray gun atomizes the paint using high speed atomizing air as described above. The atomizing air transports the paint toward the work while atomizing it. When atomizing air with paint particles collides with the workpiece, the atomizing air is repelled by the workpiece. From this, convection occurs on the surface of the work, and an air flow moving away from the work toward the outer periphery is generated. This outward moving air stream is accompanied by paint particles. Then, the paint particles moving to the outer peripheral side scatter around without adhering to the work. Therefore, a part of the paint discharged from the paint air spray gun is wasted without adhering to the work.
　塗料エアスプレーガンの設計において、エアスプレーガンから吐出する塗料の量を多くするときには、塗料粒子に対して要求される平均粒径を確保するために、微粒化エアの量を多くする設計が行われる。このことは、塗装の作業効率を向上できる反面、前述したように塗着効率が低下するという問題を含む。 In the design of paint air spray guns, when increasing the amount of paint discharged from the air spray gun, in order to ensure the average particle size required for paint particles, the design is made to increase the amount of atomizing air. It will be. Although this can improve the work efficiency of painting, it involves the problem that the deposition efficiency is lowered as described above.
　前述したように、塗料エアスプレーガンから吐出される塗料の量と、ワークに付着した塗料の量との比率は「塗着効率」と呼ばれている。塗着効率を向上させるにはエア量を削減するのが効果的であるが、エア量を削減すると塗料の粒子径が大きくなり、塗料粒子に関する所望の平均粒径（微粒化）を確保できなくなるという問題が発生する。 As described above, the ratio of the amount of paint discharged from the paint air spray gun to the amount of paint adhering to the work is called "coating efficiency". Although it is effective to reduce the amount of air to improve the coating efficiency, reducing the amount of air increases the particle size of the paint and makes it impossible to ensure the desired average particle size (fine particle size) of the paint particles. The problem of
　すなわち、塗料の微粒化と塗着効率とは相反する関係にある。使用するエア量を少なくすると塗着効率が向上するが、その一方で塗料粒子の粒子径が大きくなるという問題が発生する。他方、エア量を多くすると、塗料粒子の粒子径を小さくすることができるが、塗着効率が悪化するという問題が発生する。 That is, there is a contradictory relationship between the atomization of the paint and the coating efficiency. If the amount of air used is reduced, the coating efficiency is improved, but on the other hand, there arises a problem that the particle diameter of the paint particles is increased. On the other hand, when the amount of air is increased, the particle diameter of the paint particles can be reduced, but the problem arises that the coating efficiency is deteriorated.
　本発明の目的は、塗料に対する所望の微粒化を確保しつつ塗着効率を向上することのできる塗料エアスプレー装置を提供することにある。 An object of the present invention is to provide a paint air spray device capable of improving the coating efficiency while securing desired atomization to a paint.
　上記の技術的課題を達成すべく、本発明にあっては、
　軸線を備え、塗料源から液体塗料が供給される塗料ノズル部と、
　該塗料ノズル部の中に前記軸線と同軸に配置され、霧化エアが供給されるエア吐出部材と、
　前記塗料ノズル部において、前記エア吐出部材の外周側に形成された塗料通路から供給される前記液体塗料を前方に吐出する正面視リング状の塗料吐出開口と、
　該塗料吐出開口に隣接し且つ該塗料吐出開口よりも外周側に位置し、外周側エアを前方に吐出する第１エア開口とを有し、
　前記エア吐出部材は、その前端部に第２エア開口を有し、該第２エア開口から前記霧化エアが吐出されることを特徴とする塗料エアスプレー装置を提供することにより達成される。 In order to achieve the above technical problems, in the present invention,
A paint nozzle unit which has an axis and is supplied with liquid paint from a paint source;
An air discharge member disposed coaxially with the axis in the paint nozzle and supplied with atomized air;
A front view ring-shaped paint discharge opening for discharging the liquid paint supplied from a paint passage formed on the outer peripheral side of the air discharge member in the paint nozzle portion;
A first air opening adjacent to the paint discharge opening and located on the outer peripheral side of the paint discharge opening and discharging the outer peripheral air forward;
The air discharge member has a second air opening at its front end, and the atomized air is discharged from the second air opening. This is achieved by providing a paint air spray device.
　本発明に従う塗料エアスプレー装置によれば、リング状の塗料吐出開口を通じて前方に吐出される塗料は中空の円筒状である。これに対して、従来の塗料エアスプレー装置から吐出される塗料は、前述したように中実の円柱状である。したがって、本発明に従う塗料エアスプレー装置から吐出される塗料は従来に比べて「薄肉」である。 According to the paint air spray device according to the present invention, the paint discharged forward through the ring-shaped paint discharge opening is a hollow cylindrical shape. On the other hand, the paint discharged from the conventional paint air spray device has a solid cylindrical shape as described above. Therefore, the paint discharged from the paint air spray device according to the present invention is "thin" compared to the prior art.
　更に、本発明に従う塗料エアスプレー装置にあっては、この「薄肉」の中空円筒状の塗料に対して、その外周側の第１エア開口から霧化エアが吐出されるだけでなく、中空円筒状の塗料の内周側でも第２エア開口から霧化エアが吐出される。したがって、薄肉の塗料を挟んで、その外側を通る霧化エア（外周側エア）と、内側を通る霧化エア（内周側エア）とで塗料を霧化することができる。 Furthermore, in the paint air spray apparatus according to the present invention, not only atomization air is discharged from the first air opening on the outer peripheral side to the "thin" hollow cylindrical paint but also the hollow cylinder The atomized air is discharged from the second air opening also on the inner peripheral side of the second paint. Therefore, the paint can be atomized by the atomizing air (outer side air) passing through the outside and the atomizing air (inner side air) passing inside through the thin paint.
　すなわち、本願発明に従う塗料エアスプレー装置は、(1)吐出する塗料を薄肉にし、そして、(2)この「薄肉」の塗料の外周側だけでなく、(3)内周側でも霧化エアを通過させる。これにより、エアを使った塗料の微粒化の効率を飛躍的に向上させることができる。 That is, the paint air spray apparatus according to the present invention (1) thins the paint to be discharged, and (2) atomizes the air not only on the outer peripheral side of the "thin" paint but also on the inner peripheral side (3). Let it pass. Thereby, the efficiency of the atomization of the paint using air can be dramatically improved.
　したがって、従来と同じ微粒化（塗料粒子の所望の平均粒径）を達成するのに必要となるエアの量を大幅に少なくすることができる。これにより、塗着効率を向上できる。 Thus, the amount of air required to achieve the same conventional atomization (desired average particle size of paint particles) can be significantly reduced. Thereby, the coating efficiency can be improved.
　すなわち、吐出するエアの量が少なければ、ワークの表面に衝突するエネルギが小さくなる。これにより、ワークの表面で跳ね返されるなど、ワークの表面に付着しない塗料の量が少なくなる。したがって塗料のロスを激減させることができる。つまり塗着効率を高めることができる。更に、ワークの表面に衝突するエアのエネルギが小さければ、塗料エアスプレー装置をワークに近づけて塗装作業を行うことができる。これを「近接塗装」と呼ぶと、近接塗装によって、塗着効率を更に高めることができる。 That is, if the amount of air to be discharged is small, the energy colliding with the surface of the work decreases. This reduces the amount of paint that does not adhere to the surface of the workpiece, such as being bounced off the surface of the workpiece. Therefore, the loss of paint can be drastically reduced. That is, the coating efficiency can be improved. Furthermore, if the energy of the air colliding with the surface of the work is small, the paint air spray device can be brought close to the work to perform the painting operation. If this is called "proximity coating", the coating efficiency can be further enhanced by the proximity coating.
　単位時間当たりの塗料の吐出量をできる限り多くしたいという要請に応じる必要があれば、例えば単一の塗装ロボットに、本発明に従う塗料エアスプレー装置を複数設置し、更に近接塗装を行えばよい。これにより、高い作業効率を確保しつつ塗着効率も高めることができる。 If it is necessary to meet the demand for increasing the discharge amount of paint per unit time as much as possible, for example, a plurality of paint air spray devices according to the present invention may be installed on a single paint robot and proximity paint may be further performed. Thereby, the coating efficiency can be enhanced while securing high work efficiency.
　本発明の作用効果及び他の目的は、本発明の実施例の詳しい説明から明らかになろう。 The effects and other objects of the present invention will become apparent from the detailed description of the embodiments of the present invention.
第１実施例の塗料エアスプレーガン（平吹きタイプ）の先端部の断面図である。It is sectional drawing of the front-end | tip part of the paint air spray gun (flat blow type) of 1st Example. 図１の矢印Ａ(1)で示す部分の拡大図である。It is an enlarged view of the part shown by arrow A (1) of FIG. 図１に図示の塗料エアスプレーガンの正面図である。Figure 2 is a front view of the paint air spray gun illustrated in Figure 1; 第１実施例の塗料エアスプレーガンに組み込まれるエア吐出部材の先端部分の断面図である。It is sectional drawing of the front-end | tip part of the air discharge member integrated in the paint air spray gun of 1st Example. 第２実施例の塗料エアスプレーガン（平吹きタイプ）の先端部の断面図である。It is sectional drawing of the front-end | tip part of the paint air spray gun (flat-blow type) of 2nd Example. 第２実施例の塗料エアスプレーガンに組み込まれたエア吐出部材の断面図である。It is sectional drawing of the air discharge member integrated in the paint air spray gun of 2nd Example. 第１実施例の塗料エアスプレーガンの作用を説明するための図である。It is a figure for demonstrating the effect | action of the paint air spray gun of 1st Example. 従来の塗料エアスプレーガンの作用を説明するための図である。It is a figure for demonstrating the effect | action of the conventional paint air spray gun. 第３実施例の塗料エアスプレーガン（丸吹きタイプ）の先端部の断面図である。It is sectional drawing of the front-end | tip part of the paint air spray gun (round blow type) of 3rd Example. 第３実施例の塗料エアスプレーガンの作用を説明するための図である。It is a figure for demonstrating the effect | action of the paint air spray gun of 3rd Example. 第３実施例の塗料エアスプレーガンの正面図であり、好ましくは第３実施例の塗料エアスプレーガンが複数のシェーピングエア孔を備え、この複数のシェーピングエア孔が同一円周上に等間隔に配置されることを説明するための図である。It is a front view of a paint air spray gun of a 3rd embodiment, and preferably, a paint air spray gun of a 3rd embodiment is provided with a plurality of shaping air holes, and the plurality of shaping air holes are equally spaced on the same circumference. It is a figure for demonstrating what is arrange | positioned. 第３実施例の塗料エアスプレーガンの先端部の側面図であり、シェーピングエア孔からシェーピングエアが旋回流のように吐出されることを説明するための図である。It is a side view of the tip part of a paint air spray gun of a 3rd example, and is a figure for explaining that shaping air is discharged like a swirling flow from a shaping air hole. 第３実施例の塗料エアスプレーガンの先端部の斜視図であり、シェーピングエア孔からシェーピングエアが旋回流のように吐出されることを説明するための図である。It is a perspective view of the tip part of paint air spray gun of a 3rd example, and is a figure for explaining that shaping air is discharged like a swirling flow from a shaping air hole. 第４実施例として、液体塗料に炭酸ガスを混入させたスプレー塗装に第１～第３実施例を適用する場合に、塗料エアスプレーガンに供給する塗料にガス状態のCO2を混入させるミキサーを備えた液体塗料スプレーシステムの全体構成図である。As a fourth embodiment, when applying the first to third embodiments to spray coating in which carbon dioxide is mixed in liquid paint, a mixer is provided which mixes CO 2 in a gas state with paint supplied to a paint air spray gun. FIG. 1 is an overall configuration diagram of a liquid paint spray system. 従来の塗料エアスプレーガンの先端部の断面図である。It is sectional drawing of the front-end | tip part of the conventional paint air spray gun.
　以下に、添付の図面に基づいて本発明の好ましい実施例を説明する。
第１実施例（平吹きタイプ）: Hereinafter, preferred embodiments of the present invention will be described based on the attached drawings.
First embodiment (flat blow type):
　図１～図４は第１実施例の外部混合式塗料エアスプレーガンに関する図面である。図１は、塗料エアスプレーガンの先端部分の断面図である。図２は、図１の矢印Ａ(1)で指し示す部分の拡大断面図である。図３は、図１に図示の塗料エアスプレーガンの正面図である。図４は、主要部品の一つであるエア吐出部材の先端部分を構成する耐食性金属（ステンレス鋼）製の中空パイプを示す。 FIG. 1 to FIG. 4 are drawings of the external mixing type paint air spray gun of the first embodiment. FIG. 1 is a cross-sectional view of a tip portion of a paint air spray gun. FIG. 2 is an enlarged cross-sectional view of a portion indicated by arrow A (1) in FIG. FIG. 3 is a front view of the paint air spray gun shown in FIG. FIG. 4 shows a hollow pipe made of corrosion-resistant metal (stainless steel) which constitutes the tip of an air discharge member which is one of the main parts.
　図１、図２を参照して、第１実施例の塗料エアスプレーガン１００の先端部２は、塗料ノズル本体４と、塗料ノズル本体４の先端部を覆うエアキャップ６と、塗料ノズル本体４の中に配置され且つ塗料ノズル本体４の軸線Ａx上に配置されたエア吐出部材８とで構成されている。 Referring to FIGS. 1 and 2, the tip 2 of the paint air spray gun 100 according to the first embodiment includes a paint nozzle body 4, an air cap 6 covering the tip of the paint nozzle body 4, and a paint nozzle body 4. And an air discharge member 8 disposed on the axis Ax of the paint nozzle main body 4.
　図示の塗料エアスプレーガン１００は、略楕円の塗装パターンを形成する上記第２方式の塗料エアスプレー装置である。エアキャップ６は、従来と同様に、前方に向けて突出した一対の外周突出部１０を有する。一対の外周突出部１０は、軸線Ａxを挟んで互いに対抗して位置している。外周突出部１０は、軸線Ａxに向けて開口したパターンエア孔１０aを有し、パターンエア孔１０aには、パターンエア供給通路１２を通じてパターンエアが供給され、そして、従来と同様に、パターンエア孔１０aから軸線Ａxに向けて斜め前方にパターンエアが吐出される。このパターンエアによって略楕円形状の塗装パターンが形成される。 The illustrated paint air spray gun 100 is a paint air spray apparatus of the second type described above that forms a substantially elliptical paint pattern. The air cap 6 has a pair of outer peripheral protrusions 10 projecting forward as in the prior art. The pair of outer peripheral protrusions 10 are located opposite to each other with the axis Ax interposed therebetween. The outer peripheral protrusion 10 has a pattern air hole 10a opened toward the axis Ax, and pattern air is supplied to the pattern air hole 10a through the pattern air supply passage 12, and the pattern air hole is the same as in the prior art. The pattern air is discharged obliquely forward from the axis 10a toward the axis Ax. A substantially elliptical paint pattern is formed by the pattern air.
　従来と同様に、塗料エアスプレーガン１００は、塗料ノズル本体４とエアキャップ６との間に第１エア供給通路１４を有している。エアキャップ６の先端面には、軸線Ａxを中心とする中心孔１６が形成されている。この中心孔１６には塗料ノズル本体４の塗料ノズル部１８の先端部分が挿入されている。 As in the prior art, the paint air spray gun 100 has a first air supply passage 14 between the paint nozzle body 4 and the air cap 6. A central hole 16 centered on the axis Ax is formed in the tip end surface of the air cap 6. The tip end portion of the paint nozzle portion 18 of the paint nozzle main body 4 is inserted into the central hole 16.
　中心孔１６には、塗料ノズル部１８の外周面との間に、円周方向に連続して延びる円形リング状の第１エア開口２０が形成され、この第１エア開口２０には霧化エアが供給される。 A circular ring-shaped first air opening 20 continuously extending in the circumferential direction is formed between the central hole 16 and the outer peripheral surface of the paint nozzle portion 18, and the first air opening 20 is atomized air Is supplied.
　このように、塗料ノズル部１８の外周面とエアキャップ６との間に第１エア開口２０を形成したことから、従来に比べて第１エア開口２０を塗料に接近させた状態で且つ周方向に連続したリング状態で第１の霧化エア（外周側エア）を吐出させることができる。 As described above, since the first air opening 20 is formed between the outer peripheral surface of the paint nozzle portion 18 and the air cap 6, the first air opening 20 approaches the paint in the circumferential direction as compared to the prior art. The first atomizing air (outer side air) can be discharged in a continuous ring state.
　図１～図３を参照して、参照符号２２は第１補助エア孔を示し（図３）、参照符号２４は第２補助エア孔を示す。この第１、第２の補助エア孔２２、２４は従来から知られている。塗料エアスプレーガン１００に第１、第２の補助エア孔２２、２４を設けるか否かは任意である。 Referring to FIGS. 1 to 3, reference numeral 22 denotes a first auxiliary air hole (FIG. 3), and reference numeral 24 denotes a second auxiliary air hole. The first and second auxiliary air holes 22 and 24 are conventionally known. It is optional whether the paint air spray gun 100 is provided with the first and second auxiliary air holes 22 and 24.
　第１補助エア孔２２は合計２つ設けられている（図３）。この一対の第１補助エア孔２２は、互いに対抗して位置する一対のパターンエア孔１０aを結ぶ仮想線と直交し且つエア吐出部材８の軸線を通過する仮想線上において、互いに対抗して配置されている。この一対の第１補助エア孔２２から吐出されるエアは、主に、塗料の微粒化に寄与する。 A total of two first auxiliary air holes 22 are provided (FIG. 3). The pair of first auxiliary air holes 22 are disposed opposite to each other on an imaginary line which is orthogonal to an imaginary line connecting the pair of pattern air holes 10a located opposite to each other and passes the axis of the air discharging member 8 ing. The air discharged from the pair of first auxiliary air holes 22 mainly contributes to the atomization of the paint.
　第２補助エア孔２４は、図３の正面図を参照して、互いに対抗して位置する対のパターンエア孔１０aを結ぶ仮想線上に配置された二対のエア孔（合計４つ）で構成されている。この二対の第２補助エア孔２４から吐出されるエアは、塗料エアスプレーガン１００の先端部が塗料によって汚れるのを抑制するのに寄与する。 Referring to the front view of FIG. 3, second auxiliary air holes 24 are constituted by two pairs of air holes (four in total) arranged on an imaginary line connecting pairs of pattern air holes 10a located opposite to each other. It is done. The air discharged from the two pairs of second auxiliary air holes 24 contributes to suppressing the contamination of the tip of the paint air spray gun 100 by the paint.
　エア吐出部材８は軸線Ａxと同軸に配置された耐食性材料からなる中空管で構成されている。図４は、エア吐出部材８の先端部分を構成する断面円形の中空パイプを示す。この中空パイプはステンレス鋼から作られている。図示の中空パイプは、長手方向一端から他端まで同じ断面積を有している。この中空管つまりエア吐出部材８は、塗料ノズル部１８の先端中心孔３２を貫通して塗料ノズル部１８の前方つまりワークＷ側に突出した長さを有している（図１）。 The air discharge member 8 is formed of a hollow tube made of a corrosion resistant material and arranged coaxially with the axis Ax. FIG. 4 shows a hollow pipe having a circular cross section which constitutes the tip portion of the air discharge member 8. This hollow pipe is made of stainless steel. The illustrated hollow pipe has the same cross-sectional area from one longitudinal end to the other. The hollow pipe, that is, the air discharge member 8 has a length which penetrates the tip center hole 32 of the paint nozzle portion 18 and protrudes forward of the paint nozzle portion 18, that is, the work W side (FIG. 1).
　エア吐出部材８は、その外周面と塗料ノズル部１８とで、円周方向に連続して延びるリング状の塗料吐出開口３４を形成し、また、エア吐出部材８は、その内部で第２エア通路３６を形成する。第２エア通路３６には霧化エアが供給される。 The air discharge member 8 forms a ring-shaped paint discharge opening 34 continuously extending in the circumferential direction by the outer peripheral surface thereof and the paint nozzle portion 18, and the air discharge member 8 has a second air inside thereof. A passage 36 is formed. The second air passage 36 is supplied with atomized air.
　塗料通路３８（図１）には塗料源（図示せず）から液体塗料が供給され、そして、この塗料通路３８を通じて液体塗料が塗料吐出開口３４に供給される。塗料吐出開口３４は正面視円形リング状を有し、この塗料吐出開口３４を通じて液体塗料が前方に吐出される。これにより、塗料吐出開口３４から吐出される液体塗料は中空円筒状である（図７）。 The paint passage 38 (FIG. 1) is supplied with liquid paint from a paint source (not shown), and liquid paint is supplied to the paint discharge opening 34 through the paint passage 38. The paint discharge opening 34 has a circular ring shape in a front view, and the liquid paint is discharged forward through the paint discharge opening 34. Thus, the liquid paint discharged from the paint discharge opening 34 has a hollow cylindrical shape (FIG. 7).
　エア吐出部材８は軸線Ａxに沿って進退動作して塗料吐出開口３４の開閉を行うことができる。エア吐出部材８はその先端部の近傍にテーパー面８b（図１）を有している。他方、塗料ノズル本体４の内周面はテーパー面で構成された弁座４aを有している。テーパー面８bと弁座４aは、塗料通路３８を通る液体塗料に関する開閉弁を構成する。エア吐出部材８が前進動作して、テーパー面８bが弁座４aと当接することにより、塗料吐出開口３４への塗料の供給が停止される。他方、エア吐出部材８が後退動作して、テーパー面８bが弁座４aから離れることにより、塗料吐出開口３４へ塗料が供給され、塗料吐出開口３４から塗料が吐出される。変形例として、エア吐出部材８の長手方向中間部分を塗料ノズル本体４に前後動不能に固定してもよい。この場合には、塗料通路３８に供給する塗料の量を制御する弁を別途用意すればよい。 The air discharge member 8 can move forward and backward along the axis Ax to open and close the paint discharge opening 34. The air discharge member 8 has a tapered surface 8b (FIG. 1) near its tip. On the other hand, the inner peripheral surface of the paint nozzle main body 4 has a valve seat 4a formed of a tapered surface. The tapered surface 8 b and the valve seat 4 a constitute an on-off valve for liquid paint passing through the paint passage 38. The air discharge member 8 moves forward, and the tapered surface 8b abuts on the valve seat 4a, whereby the supply of the paint to the paint discharge opening 34 is stopped. On the other hand, when the air discharge member 8 moves backward and the tapered surface 8b separates from the valve seat 4a, the paint is supplied to the paint discharge opening 34, and the paint is discharged from the paint discharge opening 34. As a modification, the middle portion in the longitudinal direction of the air discharge member 8 may be fixed to the paint nozzle main body 4 so as to be movable back and forth. In this case, a valve for controlling the amount of paint supplied to the paint passage 38 may be separately prepared.
　エア吐出部材８の前端開口８aは正面視円形であり、前方に向けて開口している。エア吐出部材８によって形成される第２エア通路３６には霧化エアが供給される。そして、この霧化エアは前端開口８a（第２エア開口）を通じて前方に吐出される。 The front end opening 8a of the air discharge member 8 is circular in a front view, and is open forward. Atomized air is supplied to the second air passage 36 formed by the air discharge member 8. Then, the atomized air is discharged forward through the front end opening 8a (second air opening).
　第１実施例の塗料エアスプレーガン１００から吐出される液体塗料は中空円筒状の形状である。塗料エアスプレーガン１００は、塗料吐出開口３４に隣接し且つ塗料吐出開口３４の外周側に位置する正面視円形リング状の第１エア開口２０を有し、この円形リング状の第１エア開口２０を通じて第１エアが前方に吐出される。この第１エアは中空円筒状の液体塗料の外周側を通過する。塗料エアスプレーガン１００は、塗料吐出開口３４に隣接し且つ塗料吐出開口３４の内周側に位置する正面視円形の前端開口８a（第２エア開口）を更に有する。この前端開口８a（第２エア開口）を通じて第２エアが前方に向けて吐出され、この第２エアは中空円筒状の液体塗料の内周側を通過する。
第２実施例（平吹きタイプ）： The liquid paint discharged from the paint air spray gun 100 of the first embodiment has a hollow cylindrical shape. The paint air spray gun 100 has a first air opening 20 in the form of a circular ring in a front view that is adjacent to the paint discharge opening 34 and located on the outer peripheral side of the paint discharge opening 34. The first air is discharged forward through the The first air passes through the outer peripheral side of the hollow cylindrical liquid paint. The paint air spray gun 100 further includes a front end opening 8a (second air opening) having a front view circular shape and located adjacent to the paint discharge opening 34 and located on the inner peripheral side of the paint discharge opening 34. Second air is discharged forward through the front end opening 8a (second air opening), and the second air passes through the inner peripheral side of the hollow cylindrical liquid paint.
Second embodiment (flat blow type) :
　図５は、第２実施例の外部混合式塗料エアスプレーガン１２０を示す。図示の塗料エアスプレーガン１２０は、上述した第１実施例の塗料エアスプレーガン１００（図１～４）の変形例でもある。したがって、第２実施例の塗料エアスプレーガン１２０の説明において、上記第１実施例の塗料エアスプレーガン１００と実質的に同じ要素には同じ参照符号を付して、その説明を省略する。 FIG. 5 shows the external mixing paint air spray gun 120 of the second embodiment. The illustrated paint air spray gun 120 is also a modified example of the paint air spray gun 100 (FIGS. 1 to 4) of the first embodiment described above. Therefore, in the description of the paint air spray gun 120 of the second embodiment, substantially the same elements as those of the paint air spray gun 100 of the first embodiment are designated by the same reference numerals, and the description thereof is omitted.
　第２実施例の塗料エアスプレーガン１２０は、図３などに示す第１、第２の補助エア孔２２、２４が省かれている。また、第２エアを吐出するエア吐出部材８の前端開口８a（第２エア開口）は前方に突出していない。前端開口８aは、第１エアを吐出する第１エア開口２０と実質的に同じ平面で開口している。 In the paint air spray gun 120 of the second embodiment, the first and second auxiliary air holes 22 and 24 shown in FIG. 3 and the like are omitted. Further, the front end opening 8a (second air opening) of the air discharging member 8 for discharging the second air does not protrude forward. The front end opening 8a is open in substantially the same plane as the first air opening 20 for discharging the first air.
　変形例として、第２実施例の塗料エアスプレーガン１２０においても、図３などに示す第１、第２の補助エア孔２２、２４を設けてもよい。また、変形例として、第２実施例の塗料エアスプレーガン１２０においても、エア吐出部材８の前端開口８aを第１実施例と同様に前方に突出させてもよい。このことは、前述した第１実施例についても云える。第１実施例の塗料エアスプレーガン１００において、第２実施例と同様に、エア吐出部材８の前端開口８a（第２エア開口）を第１エア開口２０と実質的に同じ平面で開口させてもよい。 As a modification, the paint air spray gun 120 of the second embodiment may also be provided with first and second auxiliary air holes 22 and 24 shown in FIG. As a modification, in the paint air spray gun 120 of the second embodiment, the front end opening 8a of the air discharge member 8 may be protruded forward as in the first embodiment. This can also be said about the first embodiment described above. In the paint air spray gun 100 of the first embodiment, the front end opening 8a (second air opening) of the air discharge member 8 is opened in substantially the same plane as the first air opening 20, as in the second embodiment. It is also good.
　図６は、第２実施例に含まれるエア吐出部材８を抽出した図である。図５、図６に示す参照符号４０は針状電極を示す。第２実施例の塗料エアスプレーガン１２０は静電塗装用のスプレーガンである。電極４０は好ましくは針状電極であるのがよい。針状電極４０は、エア吐出部材８の先端部分を構成する中空パイプの軸線上に配置され、そして、針状電極４０はエア吐出部材８から前方に突出している。針状電極４０の直径は、上記中空パイプの内径よりも小さく、針状電極４０と中空パイプとの間の隙間で第２エア通路３６が形成され、この隙間を霧化エアが通過可能である。これにより、針状電極４０によって内周側が規定された前端開口８a（正面視円形リング状の形状）から第２エアが前方に向けて吐出される。 FIG. 6 is a diagram in which the air discharge member 8 included in the second embodiment is extracted. Reference numeral 40 shown in FIGS. 5 and 6 denotes a needle electrode. The paint air spray gun 120 of the second embodiment is a spray gun for electrostatic coating. The electrode 40 is preferably a needle electrode. The needle electrode 40 is disposed on the axis of a hollow pipe that constitutes the tip of the air discharge member 8, and the needle electrode 40 projects forward from the air discharge member 8. The diameter of the needle electrode 40 is smaller than the inner diameter of the hollow pipe, and a second air passage 36 is formed by the gap between the needle electrode 40 and the hollow pipe, and atomization air can pass through the gap. . As a result, the second air is discharged forward from the front end opening 8 a (a shape of a circular ring in a front view) whose inner peripheral side is defined by the needle electrode 40.
　第２実施例の塗料エアスプレーガン１２０から針状電極４０を省くことによって、この塗料エアスプレーガン１２０を非静電のスプレーガンに変化させることができる。 By omitting the needle electrode 40 from the paint air spray gun 120 of the second embodiment, the paint air spray gun 120 can be changed to a non-electrostatic spray gun.
　図７は、第１実施例（図１～図４）の作用効果を説明するための図である。この説明は、図５を参照して説明した第２実施例に対しても実質的に適用できる。 FIG. 7 is a view for explaining the operation and effect of the first embodiment (FIGS. 1 to 4). This description is substantially applicable to the second embodiment described with reference to FIG.
　図７を参照して、図１などを参照して前述した塗料エアスプレーガン１００から吐出された薄肉中空円筒状の液体塗料Ｐt(L１)に対して、その外周側を第１エアが通過する。この第１エアを「外周側エアAr(out)」と呼ぶ。また、中空円筒状の液体塗料Ｐt(L１)に対して、その内周側を第２エアが通過する。この第２エアを「内周側エアAr(in）)と呼ぶ。これにより、薄肉中空円筒状の液体塗料は、外周側エアAr(out)と内周側エアAr(in）とでサンドウィッチされた状態で霧化される。 Referring to FIG. 7, the first air passes through the outer peripheral side of the thin hollow cylindrical liquid paint Pt (L1) discharged from the paint air spray gun 100 described above with reference to FIG. 1 and the like. . This first air is referred to as "outer side air Ar (out)". Further, the second air passes through the inner peripheral side of the hollow cylindrical liquid paint Pt (L1). The second air is referred to as “inner side air Ar (in)”. Thus, the thin hollow cylindrical liquid paint is sandwiched by the outer side air Ar (out) and the inner side air Ar (in). It is atomized in the cold state.
　図７において、参照符号Pt(p)は霧化状態の塗料を示す。また、中空円筒状の液体塗料Ｐt(L１)の厚みを参照符号「Th」で図示してある。 In FIG. 7, the reference sign Pt (p) indicates a paint in an atomized state. Further, the thickness of the hollow cylindrical liquid paint Pt (L1) is illustrated with a reference numeral "Th".
　図８は比較例として従来の塗料エアスプレー装置から吐出される中実円柱状の液体塗料Ｐt(L２)を示す。従来の塗料エアスプレー装置２００に含まれる塗料ノズル部２０８（図１５）から中実円柱状の形態で液体塗料Ｐt(L２)が吐出される。この中実円柱状の液体塗料Ｐt(L２)の直径を参照符号「D」で図示してある。 FIG. 8 shows a solid cylindrical liquid paint Pt (L2) discharged from a conventional paint air spray apparatus as a comparative example. The liquid paint Pt (L2) is discharged from the paint nozzle portion 208 (FIG. 15) included in the conventional paint air spray apparatus 200 in a solid cylindrical shape. The diameter of the solid cylindrical liquid paint Pt (L2) is shown by the reference symbol "D".
　図７（第１、第２実施例）と図８（従来）とを対比すると直ぐに分かるように、実施例に関連した中空円筒状の液体塗料Ｐt(L１)（図７）の厚みThの寸法は、従来に関連した中実円柱状の液体塗料Ｐt(L２)（図８）の直径Dの寸法に比べて小さい。すなわち、実施例に関連した中空円筒状の液体塗料Ｐt(L１)（図７）は薄肉である。そして、この薄肉の液体塗料Ｐt(L１)の外周側を外周側エアAr(out)（第１エア）によって微粒化させることができる。これに加えて、中空円筒状の液体塗料Ｐt(L１)の内周側を内周側エアAr(in)（第２エア）によって微粒化させることができる。すなわち、外周側エアAr(out)、内周側エアAr(in)で挟まれた中空円筒状の液体塗料Pt(L１)はその外周側だけでなく、内周側でもエアによる微粒化が行われる。そして、この円筒状の液体塗料Pt(L１)は前述したように従来に比べて薄肉である。 As can be seen immediately by comparing FIG. 7 (first and second embodiments) and FIG. 8 (conventional), the dimensions of the thickness Th of the hollow cylindrical liquid paint Pt (L1) (FIG. 7) related to the embodiments. Is smaller than the dimension of the diameter D of the conventionally related solid cylindrical liquid paint Pt (L2) (FIG. 8). That is, the hollow cylindrical liquid paint Pt (L1) (FIG. 7) associated with the example is thin. Then, the outer peripheral side of the thin liquid paint Pt (L1) can be atomized by the outer peripheral air Ar (out) (first air). In addition to this, the inner peripheral side of the hollow cylindrical liquid paint Pt (L1) can be atomized by the inner peripheral air Ar (in) (second air). That is, the hollow cylindrical liquid paint Pt (L1) sandwiched by the outer air Ar (out) and the inner air Ar (in) is atomized not only by the outer circumference but also by the air at the inner circumference. It will be. And this cylindrical liquid paint Pt (L1) is thinner than before as mentioned above.
　第２実施例では、エア吐出部材８が塗料吐出開口３４と同じ平面で開口している。この第２実施例においても、第１実施例と同様に、エア吐出部材８を塗料吐出開口３４よりも前方に突出させてもよい。第２実施例の塗料エアスプレーガン１２０にあっても、第１実施例と同様に、液体塗料が薄肉の中空円筒状の形状で吐出される。そして、この中空円筒状の液体塗料Pt(L１)に対して、その外周側を外周側エアAr(out)が通過し、更に、内周側を内周側エアAr(in)が通過する。この外周側エアAr(out)及び内周側エアAr(in)によって霧化された塗料は、針状電極４０に印加された高電圧によって帯電する。
第３実施例（丸吹きタイプ）： In the second embodiment, the air discharge member 8 is opened in the same plane as the paint discharge opening 34. Also in the second embodiment, the air discharge member 8 may be projected forward of the paint discharge opening 34 as in the first embodiment. Also in the paint air spray gun 120 of the second embodiment, the liquid paint is discharged in a thin-walled hollow cylindrical shape as in the first embodiment. Then, with respect to the hollow cylindrical liquid paint Pt (L1), the outer peripheral air Ar (out) passes through the outer peripheral side, and further, the inner peripheral air Ar (in) passes through the inner peripheral side. The paint atomized by the outer side air Ar (out) and the inner side air Ar (in) is charged by the high voltage applied to the needle electrode 40.
Third embodiment (round blow type) :
　図９は、第３実施例の外部混合式塗料エアスプレーガン１３０の先端部分の断面図である。図示の塗料エアスプレーガン１３０は、円形の塗装パターンを形成する前記第１方式（丸吹き）の塗料エアスプレー装置である。 FIG. 9 is a cross-sectional view of the tip portion of the external mixing type paint air spray gun 130 of the third embodiment. The illustrated paint air spray gun 130 is a paint air spray apparatus of the first type (round blow) for forming a circular paint pattern.
上述した第１実施例に含まれる部材又は要素と実質的に同じ部材又は要素には同じ参照符号を付して、その説明を省略する。 The members or elements substantially the same as the members or elements included in the first embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted.
　エアキャップ６は、その中心孔１６に挿入された塗料ノズル部１８の先端部分との間に、正面視したときに円周方向に連続したリング状の第１エア開口２０を形成する。 The air cap 6 forms a ring-shaped first air opening 20 which is continuous in the circumferential direction when viewed from the front, between the air cap 6 and the tip end portion of the paint nozzle portion 18 inserted into the central hole 16.
　塗料ノズル部１８には、その内部にエア吐出部材１３２が挿入され、このエア吐出部材１３２は、塗料ノズル部１８の軸線Ａxと同軸上に配置されている。このエア吐出部材１３２は、その外周側において、塗料ノズル本体４との間に円筒状の塗料通路３８を形成している。そして、エア吐出部材１３２は、塗料ノズル部１８の端との間に、第１実施例と同様に、正面視円形リング状の塗料吐出開口３４を形成しており、塗料吐出開口３４は塗料通路３８に通じている。 An air discharge member 132 is inserted into the inside of the paint nozzle portion 18, and the air discharge member 132 is disposed coaxially with the axis Ax of the paint nozzle portion 18. The air discharge member 132 forms a cylindrical paint passage 38 between itself and the paint nozzle main body 4 on the outer peripheral side. The air discharge member 132 forms a circular ring-like paint discharge opening 34 in a front view between the end of the paint nozzle portion 18 and the paint discharge nozzle portion 18, and the paint discharge opening 34 is a paint passage as in the first embodiment. It leads to 38.
　エア吐出部材１３２は、第１、第２の２つの成形品１３４、１３６で構成されて、この第１、第２の成形品１３４、１３６は導電性且つ耐食性の材料（典型的にはステンレス鋼）によって作られている。 The air discharge member 132 is composed of first and second two molded articles 134 and 136, and the first and second molded articles 134 and 136 are made of a conductive and corrosion resistant material (typically stainless steel). It is made by).
　第１成形品１３４は、塗料ノズル部１８の中を貫通している。第１成形品１３４の先端部分１３４aは前方に向けて開放した円筒状の形状を有し、この先端部分１３４aの周面で上記の円筒状塗料通路３８が形成されている。 The first molded product 134 penetrates the paint nozzle portion 18. The front end portion 134a of the first molded product 134 has a cylindrical shape opened forward, and the cylindrical paint passage 38 is formed on the circumferential surface of the front end portion 134a.
　第１成形品１３４の先端部分１３４aの一部は、塗料ノズル部１８から前方に突出して位置している。第１成形品１３４の先端面１３４bは正面視円形リング状の形状を有し、この先端面１３４bは、軸線Axに対して斜め前方に角度θで傾斜している。 A portion of the tip end portion 134 a of the first molded product 134 is positioned so as to project forward from the paint nozzle portion 18. The front end surface 134b of the first molded product 134 has a circular ring shape in a front view, and the front end surface 134b is inclined forward at an angle θ with respect to the axis Ax.
　第１成形品１３４の先端開口に第２成形品１３６が組付けられている。第２成形品１３６は先細りの形状を有し、この先細りの先端部１３６aの中心部から前方に更に延びる電極１３８が形成されている。すなわち、第３実施例の塗料エアスプレーガン１３０は、高電圧が印加される電極１３８を備えた静電方式のガンである。変形例として、塗料エアスプレーガン１３０は、電極１３８を省いて非静電方式のガンに変化させることができる。 The second molded product 136 is attached to the tip opening of the first molded product 134. The second molded product 136 has a tapered shape, and an electrode 138 is formed extending further forward from the center of the tapered tip 136a. That is, the paint air spray gun 130 of the third embodiment is an electrostatic gun having an electrode 138 to which a high voltage is applied. Alternatively, the paint air spray gun 130 can be changed to a non-electrostatic gun without the electrode 138.
　第２成形品１３６は、第１成形品１３４の内部空間で構成される第２エア通路３６の端を閉じる部材である。第２成形品１３６は、また、第１成形品１３４の傾斜した先端面１３４bと対抗する後端面１３６bを有し、この後端面１３６bは、第１成形品１３４の先端面１３４bの傾斜角度θ（この実施例では６０°）と同じ角度で傾斜している。 The second molded product 136 is a member that closes the end of the second air passage 36 formed by the internal space of the first molded product 134. The second molded product 136 also has a rear end surface 136b opposed to the inclined front end surface 134b of the first molded product 134, and the rear end surface 136b is an inclination angle θ of the front end surface 134b of the first molded product 134. In this example, it is inclined at the same angle as 60 °).
　第２成形品１３６（後端面１３６b）は、第１成形品１３４（先端面１３４b）と共同して、円周方向に連続した第２エア開口１４０を形成し、また、角度θ（この実施例では６０°）で傾斜した傾斜エア出口通路１４２を形成する。そして、第２エア開口１４０は、塗料吐出開口３４から前方に離れた位置に位置している。なお、第１成形品１３４に対する第２成形品１３６の組付けは「圧入」の方式が採用されている。 The second molded product 136 (rear end surface 136b) cooperates with the first molded product 134 (tip surface 134b) to form a circumferentially continuous second air opening 140, and an angle θ (this embodiment (60 °) forms an inclined air outlet passage 142. The second air opening 140 is located at a position spaced forward from the paint discharge opening 34. In addition, a method of “press-fitting” is adopted for assembling the second molded product 136 with respect to the first molded product 134.
　図１０を参照して、第３実施例の塗料エアスプレーガン１３０の作用を説明する。塗料吐出開口３４から液体塗料が中空円筒状の形状で前方に吐出されるのは、第１、第２実施例と同様である。塗料エアスプレーガン１３０は、第１、第２実施例と同様に、塗料吐出開口３４に隣接し且つその外周側に位置する正面視円形リング状の第１エア開口２０を有し、この第１エア開口２０を通じて外周側エアAr(out)（第１エア）が前方に吐出される。 The operation of the paint air spray gun 130 of the third embodiment will be described with reference to FIG. The liquid paint is discharged forward from the paint discharge opening 34 in a hollow cylindrical shape as in the first and second embodiments. As in the first and second embodiments, the paint air spray gun 130 has a first air opening 20 in the shape of a circular ring in a front view adjacent to the paint discharge opening 34 and located on the outer peripheral side of the paint air spray gun 130. The outer peripheral air Ar (out) (first air) is discharged forward through the air opening 20.
　第３実施例の塗料エアスプレーガン１３０は、塗料吐出開口３４から前方に離れた位置に位置する周方向に連続した第２エア開口１４０を有し、この第２エア開口１４０から角度θで径方向外方且つ斜め前方に内周側エアAr(in)（第２エア）が吐出される。この内周側エアAr(in）は、中空円筒状の液体塗料Pt(L１)を斜め前方に横断しながら塗料を霧化させる。したがって、内周側エアAr(in）は、塗料を微粒化しながら径方向外方且つ斜め前方に差し向ける。他方、外周側エアAr(out）は、前方に差し向けられている。内周側エアAr(in）によって微粒化された塗料は、外周側エアAr(out）によって更に微粒化される。そして、内周側エアAr(in）と外周側エアAr(out）とが協働することにより円形の塗装パターンが形成される。 The paint air spray gun 130 of the third embodiment has a circumferentially continuous second air opening 140 located forward of the paint discharge opening 34, and a diameter at an angle θ from the second air opening 140. The inner side air Ar (in) (second air) is discharged outward in the direction and obliquely forward. The inner circumferential air Ar (in) atomizes the paint while crossing the hollow cylindrical liquid paint Pt (L1) diagonally forward. Therefore, the inner air Ar (in) directs the paint radially outward and obliquely forward while atomizing the paint. On the other hand, the outer peripheral air Ar (out) is directed forward. The paint atomized by the inner circumferential air Ar (in) is further atomized by the outer circumferential air Ar (out). Then, a circular coating pattern is formed by the cooperation of the inner circumferential air Ar (in) and the outer circumferential air Ar (out).
　外周側エアAr(out)、内周側エアAr(in）について実験したところ、内周側エアAr(in）が塗料の霧化に関して主体的であるのが良いということが分かった。この実験は、第２エア開口１４０から吐出する内周側エアAr(in）（第２エア）の量をゼロから変化させたときに、これに対応して塗料粒子の平均粒径を計測することにより行った。例えば、内周側エアAr(in）の量がゼロのとき、微粒化した塗料粒子の平均粒径は所望の平均粒径よりも大きくなった。他方、外周側エアAr(out)（第１エア）は、塗料吐出開口３４から吐出される中空円筒状の液体塗料Pt(L１)の外周面に沿ったエアカーテンを形成して塗料が径方向外方に拡散するのを防止することを主体に寄与させるのが良いということが分かった。これによれば、塗料霧化に関して、内周側エアAr(in）の寄与率が外周側エアAr(out)よりも大きくなるように、パラメータを調整して設計するのが良い、ということが分かる。 When experiments were performed on the outer side air Ar (out) and the inner side air Ar (in), it was found that the inner side air Ar (in) should be dominant with respect to the atomization of the paint. In this experiment, when the amount of the inner circumferential air Ar (in) (second air) discharged from the second air opening 140 is changed from zero, the average particle diameter of the paint particles is measured correspondingly. It went by. For example, when the amount of the inner peripheral air Ar (in) is zero, the average particle diameter of the finely divided paint particles is larger than the desired average particle diameter. On the other hand, the outer peripheral air Ar (out) (first air) forms an air curtain along the outer peripheral surface of the hollow cylindrical liquid paint Pt (L1) discharged from the paint discharge opening 34 so that the paint is in the radial direction It turned out that it is better to contribute to preventing the spread outward. According to this, regarding paint atomization, it is better to adjust and design the parameter so that the contribution rate of the inner side air Ar (in) becomes larger than the outer side air Ar (out) I understand.
　内周側エアAr(in）を吐出する第２エア開口１４０は、前述したように、塗料吐出開口３４から前方に離れた位置に位置している。このことは、第２エア開口１４０から吐出される第２エア（内周側エアAr(in））が液体塗料Ｐt(L１)と衝突する地点では、液体塗料Ｐt(L１)が前方に向かうエネルギが減衰している。したがって、第２エア開口１４０を塗料吐出開口３４から前方に離れた位置に配置させることにより、塗料の霧化及び塗装パターンを径方向に拡大した円形にすることが容易になる。 As described above, the second air opening 140 for discharging the inner peripheral air Ar (in) is located at a position away from the paint discharge opening 34 in the forward direction. This is because, at the point where the second air (inner circumferential side air Ar (in)) discharged from the second air opening 140 collides with the liquid paint Pt (L1), the energy of the liquid paint Pt (L1) goes forward Is attenuated. Therefore, by disposing the second air opening 140 at a position away from the paint discharge opening 34, it becomes easy to make the paint atomization and the coating pattern circularly expanded in the radial direction.
　図９を参照して上述した第３実施例の塗料エアスプレーガン１３０は、好ましくは、第１エア開口２０の外周側に複数のシェーピングエア孔１４６（図９）を備えているのがよい。図１１～図１３はシェーピングエア孔１４６及びこのシェーピングエア孔１４６から吐出されるシェーピングエアＳairを説明するための図である。図１１は、塗料エアスプレーガン１３０の正面図である。図１２は、塗料エアスプレーガン１３０の先端部の側面図である。図１３はシェーピングエアＳairについて説明するための斜視図である。 Preferably, the paint air spray gun 130 of the third embodiment described above with reference to FIG. 9 is provided with a plurality of shaping air holes 146 (FIG. 9) on the outer peripheral side of the first air opening 20. 11 to 13 are diagrams for explaining the shaping air holes 146 and the shaping air Sair discharged from the shaping air holes 146. FIG. FIG. 11 is a front view of the paint air spray gun 130. FIG. 12 is a side view of the tip of the paint air spray gun 130. FIG. 13 is a perspective view for explaining the shaping air Sair.
　塗料エアスプレーガン１３０は、エアキャップ６の外周部分に複数のシェーピングエア孔１４６を有している。このシェーピングエア孔１４６は、軸線Aｘを中心とした同心円上に等間隔に配置されている。 The paint air spray gun 130 has a plurality of shaping air holes 146 at the outer peripheral portion of the air cap 6. The shaping air holes 146 are arranged at equal intervals concentrically about the axis Ax.
　このシェーピングエア孔１４６から吐出するシェーピングエアＳairによって円形の塗装パターンの直径を規定することができる。また、塗料エアスプレーガン１３０の設計において、第１エア開口２０から吐出する第１エア（外周側エアAr(out)）、第２エア開口１４０から吐出する第２エア（内周側エアAr(in））、シェーピングエア孔１４６から吐出するシェーピングエアＳairの各吐出量を調整することで塗装パターンの直径を調整することができる。更に、第１エア開口２０から吐出する第１エア（外周側エアAr(out)）、第２エア開口１４０から吐出する第２エア（内周側エアAr(in））、シェーピングエア孔１４６から吐出するシェーピングエアＳairの各吐出量を制御することにより、塗装パターンの直径を制御することができる。 The diameter of the circular coating pattern can be defined by the shaping air Sair discharged from the shaping air hole 146. Further, in the design of the paint air spray gun 130, the first air (outer side air Ar (out)) discharged from the first air opening 20, and the second air (inner side air Ar (discharged) from the second air opening 140. The diameter of the coating pattern can be adjusted by adjusting the respective discharge amounts of the shaping air Sair discharged from the shaping air hole 146). Furthermore, from the first air (outer side air Ar (out)) discharged from the first air opening 20, the second air (inner peripheral air Ar (in)) discharged from the second air opening 140, and the shaping air hole 146 The diameter of the coating pattern can be controlled by controlling the discharge amount of the shaping air Sair to be discharged.
　シェーピングエア孔１４６は、塗料エアスプレーガン１３０を正面視したときに、軸線Aｘを中心として時計回り方向又は反時計回り方向に例えば４５°で傾斜したシェーピングエアＳairを吐出するように、好ましくは、設計される。これにより、複数のシェーピングエア孔１４６から吐出されるシェーピングエアＳairは、同じ方向に捩じりを加えたような、つまり疑似的な旋回流のような流れを作る。実験によれば、捻られた状態のシェーピングエアＳairによって、所望の円形の塗装パターンを作るのに効果的であり且つ塗料の微粒化に効果的であることを確認した。 The shaping air hole 146 preferably discharges the shaping air Sair inclined at, for example, 45 ° clockwise or counterclockwise around the axis Ax when the paint air spray gun 130 is viewed from the front, Designed. As a result, the shaping air Sair discharged from the plurality of shaping air holes 146 creates a flow like twisting in the same direction, that is, a pseudo swirl flow. Experiments have shown that the shaping air Sair in a twisted state is effective in producing the desired circular coating pattern and effective in atomizing the paint.
　第３実施例の塗料エアスプレーガン１３０において、塗料吐出開口３４に隣接し且つ塗料吐出開口３４の外周側に位置する第１エア開口２０は、第１、第２実施例と同様に、円周方向に連続した正面視円形リング状の形状を有している。変形例として、第１エア開口２０は、軸線Ａｘを中心とした同心円上に等間隔に配置された複数のエア孔で構成してもよい。更なる変形例として、複数のエア孔を、軸線Aｘを中心として時計回り方向又は反時計回り方向に例えば４５°の角度で捻られた状態の外周側エアAr(out）を吐出するように設計してもよい。捻られた状態の外周側エアAr(out）を形成するために、第１エア開口２０を構成する複数のエア孔の傾斜角度の方向は、上述したシェーピングエア孔１４６の捩じり方向と同じであってもよいし、逆方向であってもよい。 In the paint air spray gun 130 of the third embodiment, the first air opening 20 adjacent to the paint discharge opening 34 and located on the outer peripheral side of the paint discharge opening 34 has a circumferential shape as in the first and second embodiments. It has a front view circular ring shape continuous in the direction. As a modification, the first air openings 20 may be configured by a plurality of air holes arranged at equal intervals concentrically around the axis Ax. As a further modification, a plurality of air holes are designed to discharge the outer peripheral air Ar (out) in a state of being twisted at an angle of, for example, 45 ° clockwise or counterclockwise around the axis Ax You may In order to form the outer circumferential air Ar (out) in a twisted state, the directions of the inclination angles of the plurality of air holes constituting the first air opening 20 are the same as the twisting direction of the shaping air hole 146 described above. It may be in the opposite direction.
　すなわち、シェーピングエア孔１４６の傾斜の方向が正面視時計回り方向であったときに、第１エア開口２０を構成する各エア孔の傾斜の方向も正面視時計方向であってもよいし、反時計方向であってもよい。
第４実施例（図１４）： That is, when the direction of inclination of the shaping air hole 146 is clockwise in a front view, the direction of inclination of each air hole constituting the first air opening 20 may also be clockwise in a front view. It may be clockwise.
Fourth Embodiment (FIG. 14) :
　液体塗料に液化炭酸ガスを混入させたスプレー塗装が知られている。液化炭酸（CO2）ガスを液体塗料に混入させることにより、シンナーの使用量を減らすことができる。液化炭酸ガスによって塗料粘度を低下させる、液化炭酸ガスが気化することに伴って塗料を微粒化できる等の効果がある。 Spray coating in which liquefied carbon dioxide is mixed in liquid paint is known. The amount of thinner used can be reduced by mixing liquefied carbon dioxide (CO 2) gas into the liquid paint. The paint viscosity can be reduced by liquefied carbon dioxide gas, and the paint can be atomized as the liquefied carbon dioxide gas is vaporized.
　図１４に図示の第４実施例は、第１～第３の実施例の塗料エアスプレーガン１００、１２０、１３０を含み且つこれらのガン１００、１２０、１３０において、ガス状態のCO2ガスが混入した塗料を生成するためのシステム１５０である。液体塗料スプレーシステム１５０は、ガス状態のCO2を塗料に混入させるミキサー１５２を有し、このミキサー１５２によって、塗料源からの液体塗料にガス状態のCO2を混入させ、CO2ガスを含有する液体塗料が塗料エアスプレーガン１００、１２０、１３０の塗料通路３８に供給される。 The fourth embodiment shown in FIG. 14 includes the paint air spray guns 100, 120, 130 of the first to third embodiments, and in these guns 100, 120, 130, gaseous CO 2 gas is mixed. 1 is a system 150 for producing paint. The liquid paint spray system 150 has a mixer 152 for mixing gaseous CO 2 into the paint, and the mixer 152 mixes the gaseous paint CO 2 into the liquid paint from the paint source, and the liquid paint containing CO 2 gas is Paint air spray guns 100, 120, 130 are supplied to the paint passage 38.
　１００、１２０、１３０　実施例の塗料エアスプレーガン
　　４　　塗料ノズル本体
　８　エア吐出部材
　８a 　　第１実施例に含まれるエア吐出部材の前端開口（第２エア開口）
　１８　　塗料ノズル部
　２０　　第１エア開口（外周側エア開口）
　３４　　リング状の塗料吐出開口
　３８　　塗料通路
　１３２　第３実施例に含まれるエア吐出部材
　１４０　第３実施例に含まれるエア吐出部材の第２エア開口
　１４２　第３実施例に含まれる第２エア開口に通じ且つ角度θで傾斜したエア出口通路
　１４６　第３実施例に含まれるシェーピングエア孔
　Ａx　　塗料ノズル部の軸線
　Ar(out)　第１エア開口から吐出される外周側エア
　Ar(in）　第２エア開口から吐出される内周側エア
　Ｓair　シェーピングエア 100, 120, 130 paint air spray gun according to the embodiment 4 paint nozzle main body 8 air discharge member 8a front end opening (second air opening) of air discharge member included in the first embodiment
18 paint nozzle portion 20 first air opening (outer side air opening)
34 ring-shaped paint discharge opening 38 paint passage 132 air discharge member included in the third embodiment 140 second air opening of air discharge member included in the third embodiment 142 second air opening included in the third embodiment And the air outlet passage inclined at an angle θ 146 shaping air hole Ax included in the third embodiment axis of the paint nozzle portion Ar (out) peripheral air discharged from the first air opening Ar (in) second air opening Inner air side Air Sair shaping air discharged from
特開２００３－３８９８８号公報JP 2003-38988 A 特開２００６－７１２９号公報JP, 2006-7129, A 特開２００８－９３６０３号公報JP 2008-93603A 特開２００９－９５７５０号公報JP, 2009-95750, A 特開２０１０－１３７２０２号公報JP, 2010-137202, A

Claims (12)

  1. 　軸線を備え、塗料源から液体塗料が供給される塗料ノズル部と、
    　該塗料ノズル部の中に前記軸線と同軸に配置され、霧化エアが供給されるエア吐出部材と、
    　前記塗料ノズル部において、前記エア吐出部材の外周側に形成された塗料通路から供給される前記液体塗料を前方に吐出する正面視リング状の塗料吐出開口と、
    　該塗料吐出開口に隣接し且つ該塗料吐出開口よりも外周側に位置し、外周側エアを前方に吐出する第１エア開口とを有し、
    　前記エア吐出部材は、その前端部に第２エア開口を有し、該第２エア開口から前記霧化エアが吐出されることを特徴とする塗料エアスプレー装置。     A paint nozzle unit which has an axis and is supplied with liquid paint from a paint source;
    An air discharge member disposed coaxially with the axis in the paint nozzle and supplied with atomized air;
    A front view ring-shaped paint discharge opening for discharging the liquid paint supplied from a paint passage formed on the outer peripheral side of the air discharge member in the paint nozzle portion;
    A first air opening adjacent to the paint discharge opening and located on the outer peripheral side of the paint discharge opening and discharging the outer peripheral air forward;
    The paint air spray apparatus according to claim 1, wherein the air discharge member has a second air opening at a front end thereof, and the atomized air is discharged from the second air opening.
  2. 　前記第１エア開口が、周方向に連続した正面視リング状の形状を有する、請求項１に記載の塗料エアスプレー装置。 The paint air spray apparatus according to claim 1, wherein the first air opening has a circumferentially continuous ring shape in a circumferential direction.
  3. 　前記第２エア開口が前方に向けて開口している、請求項１又は２に記載の塗料エアスプレー装置。 The paint air spray device according to claim 1 or 2, wherein the second air opening is open forward.
  4. 　塗料エアスプレー装置が、一対のパターンエア孔から吐出されるエアによって略楕円形状の塗装パターンを形成する平吹タイプのスプレー装置である、請求項３に記載の塗料エアスプレー装置。 The paint air spray apparatus according to claim 3, wherein the paint air spray apparatus is a flat-blowing type spray apparatus which forms a substantially elliptical paint pattern by air discharged from a pair of pattern air holes.
  5. 　前記エア吐出部材が前記塗料吐出開口より前方に突出した長さを有し、
    　前記第２エア開口が前記エア吐出部材の先端部分に形成され、
    　該第２エア開口から前記霧化エアが径方向外方且つ軸線から角度θの傾斜角度で斜め前方に吐出される、請求項１に記載の塗料エアスプレー装置。     The air discharge member has a length projecting forward from the paint discharge opening;
    The second air opening is formed at the tip of the air discharge member,
    The paint air spray apparatus according to claim 1, wherein the atomization air is discharged radially outward from the second air opening and obliquely forward at an inclination angle of an angle θ from the axis.
  6. 　前記第２エア開口が周方向に連続した開口で構成されている、請求項５に記載の塗料エアスプレー装置。 The paint air spray device according to claim 5, wherein the second air opening is constituted by a circumferentially continuous opening.
  7. 　前記塗料エアスプレー装置が、円形状の塗装パターンを形成する丸吹タイプのスプレー装置である、請求項５又は６に記載の塗料エアスプレー装置。 The paint air spray apparatus according to claim 5 or 6, wherein the paint air spray apparatus is a round blowing type spray apparatus that forms a circular paint pattern.
  8. 　前記第１エア開口の外周側に配置された複数のシェーピングエア孔を更に有し、
    　該複数のシェーピングエア孔が、前記軸線を中心とする同心円上に等間隔に配置されている、請求項７に記載の塗料エアスプレー装置。     It further has a plurality of shaping air holes disposed on the outer peripheral side of the first air opening,
    The paint air spray apparatus according to claim 7, wherein the plurality of shaping air holes are arranged at equal intervals concentrically about the axis.
  9. 　前記シェーピングエア孔が、前記軸線を中心として時計回り方向又は反時計回り方向に捻られた状態でシェーピングエアを吐出する、請求項８に記載の塗料エアスプレー装置。 The paint air spray apparatus according to claim 8, wherein the shaping air holes discharge shaping air in a state of being twisted clockwise or counterclockwise around the axis.
  10. 　前記第１エア開口が、周方向に連続した正面視リング状の形状を有する、請求項５～９のいずれか一項に記載の塗料エアスプレー装置。 The paint air spray device according to any one of claims 5 to 9, wherein the first air opening has a circumferentially continuous ring shape in a circumferential direction.
  11. 　前記第１エア開口が、前記軸線を中心とした同心円上に等間隔に配置された複数のエア孔で構成されている、請求項５～９のいずれか一項に記載の塗料エアスプレー装置。 The paint air spray device according to any one of claims 5 to 9, wherein the first air openings are constituted by a plurality of air holes arranged at equal intervals concentrically around the axis.
  12. 　複数のエア孔は、前記外周側エアを前記軸線を中心として時計回り方向又は反時計回り方向に捻られた状態で吐出する、請求項１１に記載の塗料エアスプレー装置。 The paint air spray apparatus according to claim 11, wherein the plurality of air holes discharge the outer circumferential side air in a state of being twisted clockwise or counterclockwise around the axis.
PCT/JP2018/033519 2017-09-29 2018-09-10 Coating material air spray device WO2019065192A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-190184 2017-09-29
JP2017190184A JP2021007896A (en) 2017-09-29 2017-09-29 Coating air spray device

Publications (1)

Publication Number Publication Date
WO2019065192A1 true WO2019065192A1 (en) 2019-04-04

Family

ID=65901854

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/033519 WO2019065192A1 (en) 2017-09-29 2018-09-10 Coating material air spray device

Country Status (2)

Country Link
JP (1) JP2021007896A (en)
WO (1) WO2019065192A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110339963A (en) * 2019-08-06 2019-10-18 中微半导体设备(上海)股份有限公司 Nozzle, the spray gun comprising the nozzle and its working method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4946211A (en) * 1972-09-11 1974-05-02
JPS559270U (en) * 1978-07-04 1980-01-21
JPS5624969U (en) * 1979-08-03 1981-03-06
JPS6219271A (en) * 1985-07-16 1987-01-28 Toyota Central Res & Dev Lab Inc Method and apparatus for air-liquid atomization
JPH04171067A (en) * 1990-11-05 1992-06-18 Asahi Okuma Ind Co Ltd Spray gun
JP2011194304A (en) * 2010-03-18 2011-10-06 Olympus Corp Adhesive coating apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4946211A (en) * 1972-09-11 1974-05-02
JPS559270U (en) * 1978-07-04 1980-01-21
JPS5624969U (en) * 1979-08-03 1981-03-06
JPS6219271A (en) * 1985-07-16 1987-01-28 Toyota Central Res & Dev Lab Inc Method and apparatus for air-liquid atomization
JPH04171067A (en) * 1990-11-05 1992-06-18 Asahi Okuma Ind Co Ltd Spray gun
JP2011194304A (en) * 2010-03-18 2011-10-06 Olympus Corp Adhesive coating apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110339963A (en) * 2019-08-06 2019-10-18 中微半导体设备(上海)股份有限公司 Nozzle, the spray gun comprising the nozzle and its working method

Also Published As

Publication number Publication date
JP2021007896A (en) 2021-01-28

Similar Documents

Publication Publication Date Title
JP6463802B2 (en) Spray coating equipment and system
JP2008504951A (en) Fluid atomization system and method
US6494387B1 (en) Low-pressure atomizing spray gun
US5456414A (en) Suction feed nozzle assembly for HVLP spray gun
JP5490369B2 (en) Rotary electrostatic coating apparatus and coating pattern control method
US8640976B2 (en) Spray gun having mechanism for internally swirling and breaking up a fluid
US5344078A (en) Nozzle assembly for HVLP spray gun
US6322003B1 (en) Air assisted spray nozzle
TWI357357B (en)
JP5552537B2 (en) Rotary atomization coating equipment
JP2004074155A (en) Spray gun with improved atomization
EP2058053A1 (en) Rotary electrostatic coating apparatus
RU2502566C2 (en) Rotary sprayer and method of spraying therewith
WO2019065192A1 (en) Coating material air spray device
US1425333A (en) Method of and apparatus for applying coating
WO2011125855A1 (en) Electrostatic coating device and electrostatic coating method
US20240100550A1 (en) Spray gun nozzle
JP3359771B2 (en) Low pressure atomizing spray gun
JPH02107364A (en) Air spray gun
JPH0947695A (en) Air spray gun
JPH0824726A (en) Low pressure atomizing spray gun
JPH0416258A (en) Electrostatic coating nozzle

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18860100

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18860100

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP