JPS6186963A - Rotary atomizing type painting apparatus - Google Patents

Abstract

PURPOSE:To widen the adjustment range of a painting pattern by sufficiently accelerating paint particles, by narrowing the open area of an air jet orifice and shortening the distance from the opening of the air jet orifice to the paint discharge part of an atomizing head. CONSTITUTION:The positional relation between an atomizing head 3 and a large number of air jet orifices communicated with an air passage 16 is set so that the axes of both of them are present on the same axis and the air jet orifices 17 are provided by drilling to the front surface of an annular member 15, which is positioned outside and behind the paint discharge part 14 of the atomizing head 3, at an equal distance from the axis at equal intervals. For example, the diameter of each air jet orifice 17 is set to 0.6mm and the number of said orifices 17 to 36 so as to adjust a total opening area to 20mm<2> and the distance (l) from the opening of each air jet orifice 17 to the paint discharge part is set to 30mm. By this mechanism, because the paint particles discharged to the radius direction from the paint discharge part 14 are sufficiently accelerated, a painting pattern can be throttled small and the adjustment range thereof becomes wide.

Description

【発明の詳細な説明】 本発明は、回転霧化式の塗装装置に関する。[Detailed description of the invention] The present invention relates to a rotary atomization type coating device.

従来、この種の塗装装置は、回転駆動装置の回転軸に円
筒形状、ベル形状等の霧化頭を取付け、霧化卯の基端に
塗料供給路を接続し％霧化頭の先端に塗料放出部を形成
し、塗料放出部から放射されるぐ粒を前方へ折曲する空
気流を噴出する空気噴射口を円環状に設けている。そし
て、塗装パターンの調整は、空気噴射口から噴出する空
気の流量を増減して行う、 ところが、噴出空気の流量を大さく増減しても、塗装パ
ターンは大きく変化せず、塗装パターンの調整範囲は狭
い。Conventionally, this type of painting equipment has a cylindrical, bell-shaped, etc. atomizing head attached to the rotating shaft of a rotary drive device, a paint supply path is connected to the base end of the atomizing head, and paint is supplied to the tip of the atomizing head. An air injection port is provided in an annular shape to form a discharge part and eject an air flow that bends particles emitted from the paint discharge part forward. The coating pattern is adjusted by increasing or decreasing the flow rate of the air ejected from the air injection port. However, even if the flow rate of the ejected air is greatly increased or decreased, the coating pattern does not change significantly, and the adjustment range of the coating pattern is is narrow.

本発明の目的は、上記のような欠点を有する従来品を改
良し、塗装パターンの調整範囲が広い回転霧化式塗装装
置を提供することである。An object of the present invention is to improve the conventional products having the above-mentioned drawbacks and to provide a rotary atomization type coating device with a wide adjustment range of coating patterns.

本発明者は、上記の目的を達成するため、従来品におい
て塗装パターンの調整範囲が狭い原因について研究した
。In order to achieve the above object, the present inventor conducted research into the cause of the narrow adjustment range of coating patterns in conventional products.

従来の回転霧化式塗装装置は、一般に、空気噴射口の開
口面積がｔｌＯ−以上もあって広く、また。Conventional rotary atomization coating equipment generally has a wide opening area of the air injection port, which is more than tlO-.

空気噴射口の開口から霧化頭先端の塗料放出部までの距
離が５　Ｑ　８１以上もあって長いので、空気噴射口か
ら噴出する空気の流量を最大の、！　Ｑ　Ｑ　Ｎ＃ｆｒ
１ｉｎにしても１円筒形状霧化頭の塗料放出部の外回り
位置を通過する空気流の軸方向速度は、１０〜／ｊ　”
／　！ｌｅｃ　ｌ、かなく、非常に遅いい従って、上記
の空気流は、軸方向速度が遅いので、霧化頭の塗料放出
部から遠心力で半径方向に高速度で放射される塗粒を軸
方向に十分に加速することができず。The distance from the opening of the air nozzle to the paint discharge part at the tip of the atomizing head is over 5Q81, so the flow rate of air ejected from the air nozzle can be maximized. Q Q N#fr
Even if it is 1 inch, the axial velocity of the air flow passing through the outer circumferential position of the paint discharge part of a cylindrical atomizing head is 10~/j''
/! Therefore, since the above-mentioned air flow has a low axial velocity, it axially moves the paint particles emitted from the paint discharge part of the atomizing head at high speed in the radial direction by centrifugal force. unable to accelerate sufficiently.

塗装パターンを小さく絞ることが困難でちる。It is difficult to narrow down the paint pattern to a small size.

霧化頭がベル形状をなし、その霧化頭の外周背面と空気
噴射口が対面した従来品の場合は、空気噴射口から噴出
した空気流は、霧化頭の外周背面に衝突し、軸方向速度
が更に遅くなる。In the case of a conventional product with a bell-shaped atomizing head and an air jet port facing the outer peripheral back surface of the atomizing head, the air flow ejected from the air jet port collides with the outer peripheral back surface of the atomizing head, and the shaft The directional speed becomes even slower.

また、空気噴射口に至る通路を螺旋状に配置し、空気噴
射口から噴出する空気流を軸方向から傾斜させた従来品
の場合は、空気噴射口から噴出する空気流は、軸方向か
ら傾斜した分、軸方向速度が減少する。In addition, in the case of conventional products in which the passage leading to the air injection port is arranged in a spiral pattern and the airflow ejected from the air injection port is inclined from the axial direction, the airflow ejected from the air injection port is inclined from the axial direction. The axial velocity decreases accordingly.

更に、空気噴射口を霧化頭と一体に設けて霧化頭と一緒
に回転する従来品の場合は、空気噴射口から噴出する空
気流は、回転することにより軸方向速度が減衰する。Furthermore, in the case of a conventional product in which the air injection port is provided integrally with the atomization head and rotates together with the atomization head, the axial velocity of the air flow ejected from the air injection port is attenuated by rotation.

即ち、従来品において塗装パターンの調整範囲が狭い原
因は、霧化頭の塗料放出部の外回り位置を通過する空気
流の軸方向速度が遅＜ｈＮ化頭の塗料放出部から遠心力
で半径方向に放射される塗粒な軸方向に十分に加速する
ことができないことである。In other words, the reason why the adjustment range of the coating pattern is narrow in the conventional product is that the axial speed of the airflow passing through the outer circumferential position of the paint discharge part of the atomizing head is slow. The problem is that the particles emitted by the beam cannot be sufficiently accelerated in the axial direction.

そこで１本発明者は、上記の空気流の軸方向速度を高め
るため、空気噴射口の開口面積を狭めると共に、空気噴
射口の開口から霧化頭の塗料放出部外での距離を短くす
ることに着眼し、各種の実験を行った。Therefore, in order to increase the axial speed of the air flow, the inventor of the present invention narrowed the opening area of the air injection port and shortened the distance from the opening of the air injection port to the outside of the paint discharge part of the atomizing head. We focused on this and conducted various experiments.

空気噴射口から噴出する空気の流量を２００　Ｎ（／　
ｍｉｎ　にした場合、空気噴射口の開口面積Ｘ１−２０
−にすると、第１図に黒丸付実線で示すように、霧化頭
の塗料放出部外回り位置を通過する空気流の軸方向速度
は、空気噴射口の開口から霧化頭の塗料放出部までの距
離が３Ｑｒａｍ以下のときに、／５７ｓｅｃｙ；、−超
え、従来品の場合より速くなる。The flow rate of air ejected from the air injection port is set to 200 N (/
When set to min, the opening area of the air injection port is X1-20
-, as shown by the solid line with black circles in Figure 1, the axial velocity of the airflow passing through the outer circumferential position of the paint discharge part of the atomization head is from the opening of the air injection port to the paint discharge part of the atomization head. When the distance is 3Qram or less, /57secy;, - exceeds, which is faster than the conventional product.

また、空気噴射口の開口面積を７０−にすると。Moreover, if the opening area of the air injection port is set to 70-.

同口に白丸付実線で示すように、空気流の軸方向速度は
更に速くなる。As shown by the solid line with white circles at the same point, the axial velocity of the airflow becomes even faster.

なお、円環状空気噴射口の中心径は、霧化頭の塗料放出
部の外径の７倍以上であると、霧化頭との衝突による空
気流の減速がほとんどない。また２倍以下であると、空
気流によって塗粒を軸方向に十分に加速することができ
る。In addition, when the center diameter of the annular air injection port is 7 times or more the outer diameter of the paint discharge part of the atomizing head, there is almost no deceleration of the air flow due to collision with the atomizing head. Moreover, if it is twice or less, the coating particles can be sufficiently accelerated in the axial direction by the air flow.

従って１本発明は、上記の実験結果から明らかなように
、霧化頭の軸方向に沿って前方へ空気を噴出する非回転
の空気噴射口の開口面積ｅ　、２　ｏ　ｙｔｙｉ以下に
設定し、空気噴射口の開口から霧化頭の塗料放出部まで
の距離を３０闘以下に設定し、霧化頭と同芯状の円環状
空気噴射口の中心径を霧化頭の塗料放出部の外径以上に
設定したことを特徴とする回転霧化式塗装装置である。Therefore, in the present invention, as is clear from the above experimental results, the opening area of the non-rotating air injection port that blows air forward along the axial direction of the atomizing head is set to be equal to or less than 2 o ytyi, Set the distance from the opening of the air nozzle to the paint discharge part of the atomizing head to 30mm or less, and set the center diameter of the annular air nozzle that is concentric with the atomization head to the outside of the paint discharge part of the atomization head. This is a rotary atomizing coating device that is characterized by being set to be larger than the diameter of the rotary atomizer.

この塗装装置においては、霧化頭の塗料放出部外回り位
置を通過する空気流の軸方向速度が従来品の場合より速
く、霧化頭の塗料放出部から遠心力で半径方向に放出さ
ねる塗粒を軸方向に十分に加速することができるので、
塗装パターンを小さく絞ることができ、塗装パターンの
調整範囲が広い。In this coating device, the axial velocity of the airflow passing through the outer circumferential position of the paint discharge part of the atomizing head is faster than that of conventional products, and the paint is discharged in the radial direction from the paint discharge part of the atomization head by centrifugal force. Since the grains can be sufficiently accelerated in the axial direction,
The painting pattern can be narrowed down and the adjustment range of the painting pattern is wide.

なお、従来品は、空気流の軸方向速度が遅い方が塗着効
率が高いという固定概念に基いているが、本発明者の研
究実験によるとこの固定概念は正しくない。空気流の軸
方向速度が速くても、その空気流によって塗粒を軸方向
に十分に加速してやれば、塗着効率は、低下せず、上昇
する場合もあるのである。The conventional product is based on the fixed concept that the slower the axial velocity of the airflow, the higher the coating efficiency, but according to research and experiments conducted by the present inventors, this fixed concept is incorrect. Even if the axial speed of the airflow is high, if the coating particles are sufficiently accelerated in the axial direction by the airflow, the coating efficiency will not decrease and may even increase.

次に１本発明の実施例について説明する。Next, one embodiment of the present invention will be described.

第２図と第３図に示す本例の回転霧化式塗装装置は、最
高回転数が毎分６万回転になるエアターボモータ（１）
のケース先端から突出した回転軸（２）に、円筒部（４
）の先端に円盤部（５）を同志伏に連設したハブ（３）
を挿嵌し、ハブの円盤部（５）の中心に穿設したテーバ
状の取付孔ｒ６）にエアターボモータの回転軸（２）の
テーパ状先端部Ｐ密嵌して、ハブの円盤部（５）の巾１
ｕを貫通したビス（７）によってハブ（３）をエアター
ボモータの回転軸（２）に同志杖に取付け、ハブ（３）
の外周に円筒体（８）の後半部を嵌合し１円筒体（８）
の前半部をハブ（３）の前方位置に突出して１円筒体（
８）をその周壁に螺貫したビス（９）によってハブ（３
）に同志伏に取付け、一体化したハブ（３）と円筒体（
８）によって霧化頭を構成している。霧化頭（３）　、
　（８）は、エアターボモータ（１３を介して図示しな
い直流高電圧発生装置に接続し、電極に兼用している。The rotary atomizing coating device of this example shown in Figures 2 and 3 uses an air turbo motor (1) with a maximum rotation speed of 60,000 revolutions per minute.
A cylindrical part (4) is attached to the rotating shaft (2) protruding from the tip of the case.
) A hub (3) with a disc part (5) connected in parallel at the tip of the hub (3)
and tightly fit the tapered tip P of the rotating shaft (2) of the air turbo motor into the tapered mounting hole r6) drilled in the center of the disc part (5) of the hub. (5) Width 1
Attach the hub (3) to the rotary shaft (2) of the air turbo motor with the screw (7) passing through u, and then attach the hub (3)
Fit the rear half of the cylindrical body (8) to the outer periphery of the cylindrical body (8).
1 cylindrical body (
The hub (3) is attached by screw (9) screwed into the peripheral wall of the hub (8).
), and the integrated hub (3) and cylindrical body (
8) constitutes the atomizing head. Atomization head (3),
(8) is connected to an unillustrated DC high voltage generator via an air turbo motor (13) and also serves as an electrode.

エアターボモータ（１）のケース先端には、図示しない
塗料供給装置に接続した塗料供給管０１を取付け、塗料
供給管００の先端開口を霧化頭のハブの円筒部（４）内
に配置して、霧化頭（３）　、　（８１の基端に塗料供
給路００を接続している。霧化頭のハブの円筒部（４）
先端ル慣壁には１円筒体（８）の前半部内に連通する多
数の塗料通過孔（１υを等間隔に貫設し１円筒体（８）
の前半部内周面を塗料流動面ｏ２に形成し、また、円筒
体（８）の先端内周面に、塗粒への空気の巻込を防止す
る多数の塗料分流溝（１３を等間隔に軸方向に沿って設
け、円筒体Ｃ８）の先端の開口縁？塗料放出部Ｑ４１に
している。A paint supply pipe 01 connected to a paint supply device (not shown) is attached to the tip of the case of the air turbo motor (1), and the tip opening of the paint supply pipe 00 is placed inside the cylindrical part (4) of the hub of the atomizing head. The paint supply path 00 is connected to the base end of the atomizing head (3) (81).The cylindrical part (4) of the hub of the atomizing head
The tip wall has a large number of paint passing holes (1υ) that communicate with the front half of the cylindrical body (8) at equal intervals.
The inner circumferential surface of the front half of the cylindrical body (8) is formed as a paint flow surface o2, and the inner circumferential surface of the tip of the cylindrical body (8) is provided with a large number of paint flow dividing grooves (13 arranged at equal intervals) to prevent air from being drawn into the paint particles. The opening edge at the tip of the cylindrical body C8) is provided along the axial direction. The paint discharge part is set to Q41.

また、エアターボモータ（１）のケース先端には、絶縁
材料の円環状部材ｎ９を霧ｒヒ卯Ｃ３）　、　（８）に
遊嵌して固定し、霧化頭（３）　、　（８１の外回りに
配置した円環状部材０９内に円環状の空気通路００を形
成し、空気路Ｑｌの上部に図示しない流量調整弁を介し
て高圧空気供給装置を接続し、霧化頭の塗料放出部（挿
より後方に位置する円環状部材αｅの前面に、空気通路
ＯＱに連通ずる多数の空気噴射口ｑ乃ご霧化頭（３）。Further, at the tip of the case of the air turbo motor (1), an annular member n9 made of insulating material is loosely fitted and fixed to the atomizing heads (3), (81). An annular air passage 00 is formed in an annular member 09 disposed on the outer periphery, and a high-pressure air supply device is connected to the upper part of the air passage Ql via a flow rate adjustment valve (not shown). On the front surface of the annular member αe located behind the insert, there are a number of air injection ports q and atomization heads (3) communicating with the air passage OQ.

（８）の軸芯から等距離に等間隔に穿設している。(8) are drilled at equal intervals at equal distances from the axis.

空気噴射口ａ′？）の径と数は０６朋と３６個であるか
ら、空気噴射口αηの総開口面積は、約１０ｊｒ／であ
り、２０Ｉｎ１以下である。また、空気噴射口αηの開
口から霧化頭の塗料放出部αＩＯまでの距離ｌは、１０
朋であり、３　Ｑ　１１１以下である。なお、霧化頭（
：’１１　、　（８）と同志の円環状に配列した空気噴
射口αηの中’Ｌ？　？Ｉ−Ｄは、５０１！ｒＩＲであ
り、霧化頭（３）　、　（８）の外径即ち塗料放出部０
４）の外径ｄの／３倍である。Air injection port a′? ) are 36 in diameter and in number, the total opening area of the air injection ports αη is about 10jr/, which is less than 20In1. Moreover, the distance l from the opening of the air injection port αη to the paint discharge part αIO of the atomizing head is 10
My name is 3 Q111 or less. In addition, the atomization head (
:'11, 'L' inside the air injection ports αη arranged in a circular ring similar to (8)? ? ID is 501! rIR, and the outer diameter of the atomizing heads (3) and (8), that is, the paint discharge part 0
4) is /3 times the outer diameter d.

本例の回転霧化式塗装装置を駆動すると、霧化頭（３）
　、　（１’＋＋が高速同転し、電極兼用の霧化頭（３
）　、　（８）とその前方に配置した図示しない被塗装
物との間に直流高１に圧が印加され、空気通路０Ｑに高
圧空気が供給されて、各空気噴射口αηから前方に空気
が噴出し、また、塗料供給路０ＣＪから霧化頭の基端側
のハブ（３ン内に塗料が供給される。回転中の鳴化頭の
ハブ（３）内に供給された塗料は、遠心力によって。When the rotary atomizing coating device of this example is driven, the atomizing head (3)
, (1'++ rotates at high speed, and the atomization head (3
), (8) and the object to be painted (not shown) placed in front of it, pressure is applied at DC height 1, high pressure air is supplied to the air passage 0Q, and air is directed forward from each air injection port αη. Also, paint is supplied from the paint supply path 0CJ into the hub (3) on the base end side of the atomizing head. By force.

多数の塗料通過孔０１）を経て円筒体（８）の前半部内
に至り、円筒体の塗料流動面（１２を薄膜状になって流
動し、多数の塗料分流溝（１，１に流入して多数の液糸
流に分流し、塗料放出部０４）から半径方向に放射され
％繊維状微粒化が行なわれる。霧化頭の塗料放出部（１
４１から半径方向に放射された塗粒は、空気噴射口ａ乃
から塗料放出部０滲の外回り位置を前方に噴出する空気
流による力と、塗粒と被塗装物間に作用する静電引力と
によって、飛行方向を前方に折曲されて飛行し、被塗装
物に付着する。The paint reaches the front half of the cylinder (8) through a large number of paint passage holes (01), flows through the paint flow surface (12) of the cylinder as a thin film, and flows into a large number of paint distribution grooves (1, 1). The liquid is divided into a large number of thread streams and radially radiated from the paint discharge part 04) to achieve fibrous atomization.The paint discharge part (1
The coating particles emitted in the radial direction from 41 are affected by the force caused by the air flow that is ejected forward from the air injection port a to the outer circumference of the paint discharge part 0, and the electrostatic attraction force that acts between the coating particles and the object to be coated. As a result, the flying direction is bent forward and it adheres to the object to be coated.

塗装パターンを調整する場合、空気通路ＧＱに供給する
空気の流量即ち空気噴射口α力から噴出する空気の流量
を増減する。When adjusting the coating pattern, the flow rate of air supplied to the air passage GQ, that is, the flow rate of air ejected from the air injection port α, is increased or decreased.

塗装パターンの大きさと上記の空気流量の関係は、第４
図に示すようＫなる。塗装パターンの大きさは、空気流
量が最大の２００　ＮＩＪ／　ｍｉｎのときに、約２ｇ
目であり、空気流ｆｉｔが最小の零のときの約３Ｓ％に
絞られる。これに対し、従来品においては、７５％位に
しか絞ることができない。The relationship between the size of the coating pattern and the above air flow rate is
As shown in the figure, it becomes K. The size of the coating pattern is approximately 2g when the air flow rate is the maximum of 200 NIJ/min.
The airflow fit is narrowed down to about 3S% of the minimum zero. On the other hand, with conventional products, it is possible to narrow down the amount to only about 75%.

塗着効率は、り５％以上である。また、静電引力を利用
しない非静電式の場合は、６０〜ｇｏ％である。こねに
対し、非静電式の従来品においては、２０〜３０％でち
る。The coating efficiency is 5% or more. Moreover, in the case of a non-electrostatic type that does not utilize electrostatic attraction, it is 60 to go%. In contrast to kneading, conventional non-electrostatic products use 20 to 30% of the dough.

本例の回転霧化式塗装装置においては、空気噴射口の開
口面積が約１０ｆｆ／と狭いために、空気噴射口から噴
出する空気流の初速が速く、また、空気噴射口の開口か
ら霧化頭の塗料放出部までの距離が１０朋と短いために
、空気流が塗料放出部に達するまでの減速が少なく、更
に、空気流が霧化卯に衝突しないことから、塗料放出部
の外回り位置を通過する空気流の軸方向速度が非常に速
い。In the rotary atomization type coating apparatus of this example, since the opening area of the air injection port is as narrow as approximately 10 ff/, the initial velocity of the air flow ejected from the air injection port is high, and the atomization occurs from the opening of the air injection port. Since the distance from the head to the paint discharge part is as short as 10 mm, there is little deceleration of the air flow until it reaches the paint discharge part, and furthermore, since the air flow does not collide with the atomizer, the outer position of the paint discharge part is The axial velocity of the airflow passing through is very high.

そのために、塗料放出部から半径方向に放射される塗粒
は、空気流による大きな力によって軸方向に十分に加速
されるので、塗装パターンを小さく絞ることがでさ、塗
装パターンの調整範囲が広い。For this reason, the paint particles emitted in the radial direction from the paint discharge part are sufficiently accelerated in the axial direction by the large force generated by the airflow, making it possible to narrow the paint pattern to a small size and widening the adjustment range of the paint pattern. .

上記の図示実施例においては、空気噴射口を円環状に設
けるに当り、多数個の小円形の空気噴射口を円環状に配
列しているが、複数個の円弧状スリットの空気噴射口を
円環状に配列してもよいし、また、７個の円環状スリッ
トの空気噴射口を設けてもよい。In the embodiment shown above, when providing the air injection ports in an annular shape, a large number of small circular air injection ports are arranged in an annular shape. They may be arranged in a ring shape, or seven annular slit air injection ports may be provided.

また、上記の図示実施例においては、霧化頭は。Further, in the illustrated embodiment described above, the atomizing head is.

円筒形状をしているが、ベル形状でもよいし、また、先
広状又は先細状の円錐筒形状でもよい。Although it has a cylindrical shape, it may have a bell shape or a conical tube shape with a wide or tapered shape.

また、霧化頭の塗料放出部の構造と形状は、上記の図示
実施例のものに限定されるわけではない。Furthermore, the structure and shape of the paint discharge portion of the atomizing head are not limited to those of the illustrated embodiments.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の実験例の回転霧化式塗装装置における
空気流の軸方向速度と空気噴射口と塗料放出部間の距離
の関係を空気噴射口の各開口面積について示した線図で
ある。 第２図は本発明の実施例の回転霧化式塗装装置の一部縦
断ｆ１１１１而図であり、第３図は同塗装装置の正面図
であり、第≠図は同塗装装置における塗装パターンの大
きさと空気流量の関係を示す線図である。 １：エアターボモーフ９回転駆動装置 ２：回転軸　　　　　　３，８：霧化頭１０：塗料供給
管、塗料供冶路 １４：塗料放出部　　　１７：空気噴射口第４図 空近う此量（Ｎｆ／ｍｉｎ）FIG. 1 is a diagram showing the relationship between the axial velocity of the air flow and the distance between the air injection port and the paint discharge part for each opening area of the air injection port in the rotary atomization type coating apparatus of the experimental example of the present invention. be. Fig. 2 is a partial vertical cross-sectional view of the rotary atomization type coating device according to the embodiment of the present invention, Fig. 3 is a front view of the same coating device, and Fig. 3 shows the coating pattern in the same coating device. It is a diagram showing the relationship between size and air flow rate. 1: Air turbo morph 9 rotation drive device 2: Rotating shaft 3, 8: Atomizing head 10: Paint supply pipe, paint supply path 14: Paint discharge part 17: Air injection port /min)

Claims (4)

【特許請求の範囲】[Claims] （１）回転駆動装置の回転軸に霧化頭を取付け、霧化頭
の基端に塗料供給路を接続し、霧化頭の先端に塗料放出
部を形成し、塗料放出部から放射される塗粒を前方へ折
曲する空気流を噴出する空気噴射口を円環状に設け、空
気噴射口から噴出する空気の流量を増減して塗装パター
ンを調整する回転霧化式塗装装置において、霧化頭の軸
方向に沿つて前方へ空気を噴出する非回転の空気噴射口
の開口面積を２０ｍｍ＾２以下に設定し、空気噴射口の
開口から霧化頭の塗料放出部までの距離を３０ｍｍ以下
に設定し、霧化頭と同芯状の円環状空気噴射口の中心径
を霧化頭の塗料放出部の外径以上に設定したことを特徴
とする回転霧化式塗装装置。(1) Attach the atomizing head to the rotating shaft of the rotary drive device, connect the paint supply path to the base end of the atomizing head, form the paint discharge part at the tip of the atomization head, and emit the paint from the paint discharge part. Atomization is a method of atomization in rotary atomization coating equipment, which has an annular air injection port that ejects an air flow that bends the coating particles forward, and adjusts the coating pattern by increasing or decreasing the flow rate of the air ejected from the air injection port. The opening area of the non-rotating air jet that blows air forward along the axial direction of the head is set to 20 mm^2 or less, and the distance from the opening of the air jet to the paint discharge part of the atomizing head is 30 mm or less. , and the center diameter of the annular air injection port concentric with the atomizing head is set to be larger than the outer diameter of the paint discharge part of the atomizing head. （２）円環状空気噴射口の中心径を霧化頭の塗料放出部
の外径の２倍以下に設定したことを特徴とする特許請求
の範囲第１項記載の回転霧化式塗装装置。(2) The rotary atomizing coating device according to claim 1, wherein the center diameter of the annular air injection port is set to be less than twice the outer diameter of the paint discharge portion of the atomizing head. （３）空気噴射口の開口面積を１０ｍｍ＾２以下に設定
したことを特徴とする特許請求の範囲第１項又は第２項
記載の回転霧化式塗装装置。(3) The rotary atomization coating device according to claim 1 or 2, wherein the opening area of the air injection port is set to 10 mm^2 or less. （４）空気噴射口の開口から霧化頭の塗料放出部までの
距離を１０ｍｍ以下に設定したことを特徴とする特許請
求の範囲第１項、第２項又は第３項記載の回転霧化式塗
装装置。(4) Rotary atomization according to claim 1, 2, or 3, characterized in that the distance from the opening of the air injection port to the paint discharge part of the atomizing head is set to 10 mm or less. Type painting equipment.