JP5594735B2

JP5594735B2 - Rotating atomizing head

Info

Publication number: JP5594735B2
Application number: JP2011053754A
Authority: JP
Inventors: 隆夫上野
Original assignee: Trinity Industrial Corp
Current assignee: Trinity Industrial Corp
Priority date: 2011-03-11
Filing date: 2011-03-11
Publication date: 2014-09-24
Anticipated expiration: 2031-03-11
Also published as: JP2012187525A

Description

本発明は、塗装ガンに着脱可能に取り付けられて回転駆動されると共に、回転中心部分に、塗料の通過経路の一部としての塗料部屋を有した回転霧化頭に関する。 The present invention relates to a rotary atomizing head that is detachably attached to a paint gun and is rotationally driven, and has a paint chamber as a part of a paint passage in the center of rotation.

従来、この種の回転霧化頭として、塗料部屋を内側に備えたインナーハウジングと、そのインナーハウジングを前方から受容可能な中央組付孔を有したアウターハウジングとに分割されたものが知られている。また、そのインナーハウジングは、塗料部屋の前面を閉塞する前面区画壁とそれ以外のインナー本体とに分割され、インナー本体が中央組付孔に挿入された後、前面区画壁が中央組付孔に圧入されるようになっている（例えば、特許文献１参照）。 Conventionally, as this type of rotary atomizing head, one that is divided into an inner housing having a paint chamber inside and an outer housing having a central assembly hole that can receive the inner housing from the front is known. Yes. The inner housing is divided into a front partition wall that blocks the front surface of the paint chamber and the other inner body, and after the inner body is inserted into the central assembly hole, the front partition wall is formed into the central assembly hole. It is press-fitted (see, for example, Patent Document 1).

特開２００２−１８６８８３号公報（図２、段落［００４３］）JP 2002-168883 A (FIG. 2, paragraph [0043])

しかしながら、上記した従来の回転霧化頭では、塗料の通過経路である前面区画壁の前面及び後面が、圧入を伴う回転霧化頭の合体及び分解時に強く押されて変形又は損傷し、塗料の霧化に悪影響を及ぼすことがあった。 However, in the above-described conventional rotary atomizing head, the front and rear surfaces of the front partition wall, which is the passage route of the paint, are strongly pressed and deformed or damaged when the rotary atomizing head is combined and disassembled with press-fitting. May have an adverse effect on atomization.

本発明は、上記事情に鑑みてなされたもので、分解及び合体を繰り返しても塗料の通過経路が変形・損傷することがなく、安定して塗料を霧化することが可能な回転霧化頭の提供を目的とする。 The present invention has been made in view of the above circumstances, and a rotary atomizing head capable of stably atomizing paint without causing deformation or damage of the passage route of the paint even when repeated decomposition and coalescence are repeated. The purpose is to provide.

上記目的を達成するためになされた請求項１の発明に係る回転霧化頭は、塗装ガンに着脱可能に取り付けられて回転駆動されると共に、回転中心部分に、塗料の通過経路の一部としての塗料部屋を有した回転霧化頭であって、塗料部屋を内側に備えたインナーハウジングと、そのインナーハウジングを前方から受容可能な中央組付孔を有したアウターハウジングとに分割されると共に、インナーハウジングが、前後方向で前部インナーハウジングと後部インナーハウジングとに分割されて塗料部屋を開放可能な回転霧化頭において、前部インナーハウジングとアウターハウジングとを螺合結合した螺合結合手段と、前部インナーハウジングと後部インナーハウジングとを一体回転可能に結合した回転結合手段と、後部インナーハウジングのうち中央組付孔を通して後方に露出した後端面に形成されて、後部インナーハウジングを回転させるための工具を係合可能な工具係合部と、アウターハウジングに形成されて、前部インナーハウジングとの間で後部インナーハウジングを前後方向で挟持した後方当接部とを備えたところに特徴を有する。 The rotary atomizing head according to the invention of claim 1 made to achieve the above object is detachably attached to the coating gun and driven to rotate, and at the center of rotation as a part of the passage route of the paint. A rotary atomizing head having a paint chamber, which is divided into an inner housing having a paint chamber inside and an outer housing having a central assembly hole that can receive the inner housing from the front, A screwing means for screwing and joining the front inner housing and the outer housing in a rotary atomizing head in which the inner housing is divided into a front inner housing and a rear inner housing in the front-rear direction to open the paint chamber; A rotary coupling means for coupling the front inner housing and the rear inner housing so as to be integrally rotatable, and a rear inner housing; A tool engagement portion formed on the rear end surface exposed rearward through the center assembly hole and capable of engaging a tool for rotating the rear inner housing, and formed on the outer housing and between the front inner housing. And a rear contact portion sandwiching the rear inner housing in the front-rear direction.

請求項２の発明は、請求項１に記載の回転霧化頭において、中央組付孔外で前部インナーハウジングと後部インナーハウジングとを合体状態に保持可能なインナー仮保持手段を備えたところに特徴を有する。 According to a second aspect of the present invention, in the rotary atomizing head according to the first aspect, the inner temporary holding means capable of holding the front inner housing and the rear inner housing in a combined state outside the central assembly hole is provided. Has characteristics.

請求項３の発明は、請求項１又は２に記載の回転霧化頭において、前部インナーハウジングの前端外縁部から前方に突出し、先端に向かって徐々に薄くなった可撓筒壁を備え、可撓筒壁を縮径変形させて中央組付孔の内面に押し付けたところに特徴を有する。 The invention of claim 3 is the rotary atomizing head according to claim 1 or 2, further comprising a flexible cylindrical wall projecting forward from the outer edge of the front end of the front inner housing and gradually becoming thinner toward the tip. It is characterized in that the flexible cylindrical wall is deformed and pressed against the inner surface of the central assembly hole.

請求項４の発明は、請求項１乃至３の何れか１の請求項に記載の回転霧化頭において、前部インナーハウジングと後部インナーハウジングとの分割面は、塗料部屋の前後方向における中間部に配置され、前部インナーハウジング及び後部インナーハウジングの何れか一方の分割面における塗料部屋の開口縁に、内側に向かって徐々に薄くなった環状可撓壁を設け、他方の分割面を、環状可撓壁の先端部に前後方向から当接させて環状可撓壁の基端部から浮かせたところに特徴を有する。 According to a fourth aspect of the present invention, in the rotary atomizing head according to any one of the first to third aspects, the dividing surface between the front inner housing and the rear inner housing is an intermediate portion in the front-rear direction of the paint chamber. An annular flexible wall that is gradually thinned inward is provided at the opening edge of the paint chamber in one of the divided surfaces of the front inner housing and the rear inner housing, and the other divided surface is formed in an annular shape. It is characterized in that it is brought into contact with the distal end of the flexible wall from the front-rear direction and floated from the proximal end of the annular flexible wall.

請求項５の発明は、請求項１乃至４の何れか１の請求項に記載の回転霧化頭において、形状が異なる複数種類のインナーハウジングを備え、それら複数種類のインナーハウジングのうち任意の１つをアウターハウジングに合体可能としたところに特徴を有する。 According to a fifth aspect of the present invention, the rotary atomizing head according to any one of the first to fourth aspects includes a plurality of types of inner housings having different shapes, and any one of the plurality of types of inner housings. It is characterized in that one can be combined with the outer housing.

［請求項１の発明］
請求項１の回転霧化頭を分解するには、回転霧化頭を塗装ガンから取り外し、アウターハウジングの中央組付孔に後方から挿入した工具を、後部インナーハウジングの工具係合部に係合して一方に回転させればよい。すると、後部インナーハウジングと一体に前部インナーハウジングも回転してアウターハウジングとの螺合が外れ、前部及び後部のインナーハウジングがアウターハウジングの前方に離脱する。そして、前部及び後部のインナーハウジングを分離すれば、塗料部屋が開放して、その内部を容易に清掃することができるようになる。一方、回転霧化頭を合体するには、前部及び後部のインナーハウジングを中央組付孔に前方から挿入した状態で、中央組付孔に後方から挿入した工具を後部インナーハウジングの工具係合部に係合させて、分解時と逆側に回転させればよい。すると、前部インナーハウジングとアウターハウジングとの螺合が深まるに従って前部インナーハウジングが後方に移動し、アウターハウジングの後方当接部と前部インナーハウジングとの間で後部インナーハウジングが挟まれる。これにより、前部及び後部のインナーハウジングが合体状態に固定されると共に、アウターハウジングに対して位置決めされて、合体作業が完了する。このように本発明の回転霧化頭では、分解操作時及び合体操作時に、従来のように、塗料の通過経路が強く押されることがないので、分解及び合体を繰り返しても塗料の通過経路が変形・損傷することがなく、安定して塗料を霧化することが可能になる。また、分解及び合体に必要な工具を係合するための工具係合部が、後部インナーハウジングの後端面に配置されているので、工具係合部が塗料の霧化に悪影響を及ぼすこともない。 [Invention of Claim 1]
In order to disassemble the rotary atomizing head according to claim 1, the rotary atomizing head is removed from the coating gun, and the tool inserted from the rear into the central assembly hole of the outer housing is engaged with the tool engaging portion of the rear inner housing. And then rotate to one side. As a result, the front inner housing also rotates integrally with the rear inner housing to be unscrewed from the outer housing, and the front and rear inner housings are separated from the front of the outer housing. If the front and rear inner housings are separated, the paint chamber is opened and the inside can be easily cleaned. On the other hand, in order to unite the rotary atomizing head, a tool inserted from the rear into the central assembly hole is inserted into the central assembly hole while the front and rear inner housings are inserted into the central assembly hole from the front. Engage with the part and rotate to the opposite side of disassembly. Then, as the screwing between the front inner housing and the outer housing deepens, the front inner housing moves rearward, and the rear inner housing is sandwiched between the rear contact portion of the outer housing and the front inner housing. Accordingly, the front and rear inner housings are fixed in the combined state and positioned with respect to the outer housing, and the combining operation is completed. As described above, in the rotary atomizing head of the present invention, during the disassembling operation and the coalescence operation, the passage route of the paint is not strongly pressed as in the conventional case. The paint can be stably atomized without being deformed or damaged. Moreover, since the tool engaging part for engaging the tool required for decomposition | disassembly and uniting is arrange | positioned in the rear-end surface of a rear inner housing, a tool engaging part does not have a bad influence on atomization of a coating material. .

［請求項２の発明］
請求項２の構成によれば、前部インナーハウジングと後部インナーハウジングとがインナー仮保持手段によって合体状態に保持されるので、アウターハウジングとインナーハウジングとの螺合操作中に、そのインナーハウジングが前部と後部のインナーハウジングに分離することが防がれ、螺合操作を容易に行うことができる。また、インナーハウジングとアウターハウジングとの合体完了時には、アウターハウジングの後方当接部と前部インナーハウジングとの間で後部インナーハウジングが挟まれて、前部及び後部のインナーハウジングが合体状態に固定されるので、前部と後部のインナーハウジングをインナー仮保持手段によって仮保持後に、合体完了時には本保持されることになる。これにより、インナー仮保持手段の保持力（仮保持力）を小さくして、その仮保持操作及び仮保持解除操作を容易に行えるようにすることが可能になる。 [Invention of claim 2]
According to the configuration of the second aspect, since the front inner housing and the rear inner housing are held in the combined state by the inner temporary holding means, the inner housing is moved forward during the screwing operation between the outer housing and the inner housing. It is prevented that the inner housing and the rear inner housing are separated from each other, and the screwing operation can be easily performed. In addition, when the inner housing and the outer housing are combined, the rear inner housing is sandwiched between the rear contact portion of the outer housing and the front inner housing, and the front and rear inner housings are fixed in the combined state. Therefore, after the front and rear inner housings are temporarily held by the inner temporary holding means, they are finally held when the combination is completed. This makes it possible to reduce the holding force (temporary holding force) of the inner temporary holding means and easily perform the temporary holding operation and the temporary holding releasing operation.

［請求項３の発明］
請求項３の構成によれば、前部インナーハウジングから前方に突出した可撓筒壁が、回転霧化頭の合体状態で縮径変形されて、その弾発力で中央組付孔の内面に押し付けられるので、回転霧化頭の前端面における前部インナーハウジングとアウターハウジングとの間の分割面の隙間を確実に塞ぐことができる。 [Invention of claim 3]
According to the configuration of the third aspect, the flexible cylindrical wall protruding forward from the front inner housing is deformed and reduced in diameter in the combined state of the rotary atomizing head, and the elastic force is applied to the inner surface of the central assembly hole. Since it is pressed, the gap of the dividing surface between the front inner housing and the outer housing on the front end surface of the rotary atomizing head can be reliably closed.

［請求項４の発明］
請求項４の構成によれば、前部インナーハウジング及び後部インナーハウジングの何れか一方の分割面に設けた環状可撓壁のうち薄くなった先端部に他方の分割面が当接し、環状可撓壁の基端部からは他方の分割面が浮いているので、環状可撓壁が弾性変形して他方の分割面に密着し、塗料部屋の内面における分割面の隙間を確実に塞ぐことができる。 [Invention of claim 4]
According to the configuration of the fourth aspect, the other divided surface comes into contact with the thinned tip portion of the annular flexible wall provided on one of the divided surfaces of the front inner housing and the rear inner housing, and the annular flexible Since the other split surface is floating from the base end portion of the wall, the annular flexible wall is elastically deformed and closely adheres to the other split surface, so that the gap between the split surfaces on the inner surface of the paint chamber can be reliably closed. .

［請求項５の発明］
請求項５の構成によれば、複数種類のインナーハウジングに対してアウターハウジングを兼用して使用することができる。 [Invention of claim 5]
According to the configuration of the fifth aspect, the outer housing can also be used for a plurality of types of inner housings.

本発明の第１実施形態に係る回転霧化頭の側断面図Side sectional view of the rotary atomizing head according to the first embodiment of the present invention. 筒形回転駆動シャフトから外された回転霧化頭の側断面図Side sectional view of the rotary atomizing head removed from the cylindrical rotary drive shaft （Ａ）前部インナーハウジングの前面図，（Ｂ）その側断面図，（Ｃ）その後面図(A) Front view of front inner housing, (B) Side sectional view, (C) Rear view （Ａ）後部インナーハウジングの前面図，（Ｂ）その側断面図，（Ｃ）その後面図(A) Front view of rear inner housing, (B) Side sectional view, (C) Rear view 回転霧化頭の一部を拡大した側断面図A side cross-sectional view enlarging a part of the rotary atomizing head 本発明の第２実施形態に係る回転霧化頭の側断面図Side sectional view of a rotary atomizing head according to the second embodiment of the present invention. その回転霧化頭におけるインナーハウジングの分解側断面図Exploded side sectional view of the inner housing at the rotary atomizing head

以下、本発明の一実施形態を図１〜図５に基づいて説明する。図１には、塗装ガン１０の先端部が示されている。この塗装ガン１０は、本発明に係る回転霧化頭２０を先端部に備え、その回転霧化頭２０以外は、公知な構造になっている。即ち、塗装ガン１０は、筒形ボディ１１の中心部に筒形回転駆動シャフト１２を回転可能に支持して備え、その筒形回転駆動シャフト１２が図示しないエアーモーターから動力を受けて回転駆動されるようになっている。また、筒形回転駆動シャフト１２の中心部には、塗料供給管１３が遊嵌されかつその後端部が筒形ボディ１１に対して固定されている。そして、塗料供給管１３の内側の第１供給路１３Ａを通して、塗料が前方に向けて供給されると共に、塗料供給管１３の外側面と筒形回転駆動シャフト１２の内側面との間の第２供給路１２Ａを通して溶剤が前方に向けて供給される。また、筒形回転駆動シャフト１２の外周面には、前端部に雄螺子部１２Ｎが設けられると共に、その後側には、後方に向かって拡径したテーパー軸部１２Ｔが設けられている。また、塗料供給管１３の前端部には、全体より外径が小さいノズル部１３Ｃが備えられ、そのノズル部１３Ｃが筒形回転駆動シャフト１２の先端面より前方に突出している。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the tip of the coating gun 10. The coating gun 10 has a rotary atomizing head 20 according to the present invention at its tip, and has a known structure except for the rotary atomizing head 20. That is, the coating gun 10 includes a cylindrical rotary drive shaft 12 rotatably supported at the center of the cylindrical body 11, and the cylindrical rotary drive shaft 12 is driven to rotate by receiving power from an air motor (not shown). It has become so. In addition, a paint supply pipe 13 is loosely fitted at the center of the cylindrical rotary drive shaft 12, and a rear end portion thereof is fixed to the cylindrical body 11. Then, the paint is supplied forward through the first supply path 13 A inside the paint supply pipe 13, and the second between the outer side surface of the paint supply pipe 13 and the inner side surface of the cylindrical rotary drive shaft 12. The solvent is supplied forward through the supply path 12A. In addition, a male screw portion 12N is provided at the front end portion on the outer peripheral surface of the cylindrical rotary drive shaft 12, and a tapered shaft portion 12T having a diameter increased rearward is provided on the rear side. The front end of the coating material supply pipe 13 is provided with a nozzle portion 13 C having a smaller outer diameter than the whole, and the nozzle portion 13 C projects forward from the distal end surface of the cylindrical rotary drive shaft 12.

図２に示すように、回転霧化頭２０は、略円筒状のシャフト結合部２４の前端にベル形鍔部２３を備えてなる。また、シャフト結合部２４の内側は、ベル形鍔部２３によって前端を閉塞された結合凹部２４Ｅになっている。その結合凹部２４Ｅの内周面には、奥部に雌螺子部２４Ｎが形成されると共に、その雌螺子部２４Ｎの後側には、後方に向かって拡径したテーパー孔部２４Ｔが形成されている。そして、図１に示すように、シャフト結合部２４の雌螺子部２４Ｎと筒形回転駆動シャフト１２の雄螺子部１２Ｎとが螺合されかつ、シャフト結合部２４のテーパー孔部２４Ｔと筒形回転駆動シャフト１２のテーパー軸部１２Ｔとが摩擦係合して、回転霧化頭２０が筒形回転駆動シャフト１２と一体回転可能に結合されている。 As shown in FIG. 2, the rotary atomizing head 20 includes a bell-shaped flange portion 23 at the front end of a substantially cylindrical shaft coupling portion 24. Further, the inner side of the shaft coupling portion 24 is a coupling recess 24E whose front end is closed by a bell-shaped flange portion 23. A female screw portion 24N is formed in the inner portion of the coupling concave portion 24E, and a tapered hole portion 24T having a diameter increased rearward is formed on the rear side of the female screw portion 24N. Yes. Then, as shown in FIG. 1, the female screw portion 24N of the shaft coupling portion 24 and the male screw portion 12N of the cylindrical rotary drive shaft 12 are screwed together, and the tapered hole portion 24T of the shaft coupling portion 24 and the cylindrical rotation portion are rotated. The rotary atomizing head 20 is coupled to the cylindrical rotary drive shaft 12 so as to rotate integrally with the tapered shaft portion 12T of the drive shaft 12 by frictional engagement.

図２に示すように、ベル形鍔部２３の前面は、前方に向かって拡径した前端凹面２６になっている。前端凹面２６は、中央円形部２６Ａと、その外側を囲む中間環状部２６Ｂと、さらにその外側を囲む外側環状部２６Ｃとからなる。中央円形部２６Ａは、回転霧化頭２０の回転中心線と直行する平坦面に対して僅かに傾斜して前方に向かって拡径したテーパー面になっている。また、中間環状部２６Ｂは、前端凹面２６のうち中央寄り位置の狭い範囲に設けられ、回転霧化頭２０の回転中心と平行な円筒面に対して僅かに傾斜して前方に向かって拡径したテーパー面になっている。外側環状部２６Ｃは、中間環状部２６Ｂより大きな傾斜角で前方に向かって拡径したテーパー面になっている。なお、中間環状部２６Ｂと外側環状部２６Ｃとの間は緩やかに湾曲している。また、外側環状部２６Ｃの外縁部には、径方向に延びた複数の溝２６Ｄが形成されている。 As shown in FIG. 2, the front surface of the bell-shaped flange portion 23 is a front end concave surface 26 whose diameter is increased toward the front. The front end concave surface 26 includes a central circular portion 26A, an intermediate annular portion 26B surrounding the outside, and an outer annular portion 26C surrounding the outside. The central circular portion 26A is a tapered surface that is slightly inclined with respect to a flat surface perpendicular to the rotational center line of the rotary atomizing head 20 and is expanded in diameter toward the front. The intermediate annular portion 26B is provided in a narrow range near the center of the front end concave surface 26, and is slightly inclined with respect to a cylindrical surface parallel to the rotation center of the rotary atomizing head 20, and the diameter increases toward the front. It has a tapered surface. The outer annular portion 26C has a tapered surface whose diameter is increased toward the front at a larger inclination angle than the intermediate annular portion 26B. Note that the intermediate annular portion 26B and the outer annular portion 26C are gently curved. A plurality of grooves 26D extending in the radial direction are formed on the outer edge of the outer annular portion 26C.

図１に示すように、ベル形鍔部２３には、前端凹面２６における中央円形部２６Ａの後方に塗料部屋２７が形成されている。塗料部屋２７の内部側面２７Ｓは、前方に向かって拡径したテーパー面になっている。また、塗料部屋２７と前端凹面２６とを区画する前面区画壁２８の内面、即ち、塗料部屋２７の内部前面２７Ｆの中央部からは、円錐形突部２８Ｔが突出している。さらに、前面区画壁２８には、複数の中央排出孔３０と複数の外縁排出孔３１とが貫通形成されている。複数の中央排出孔３０は、円錐形突部２８Ｔの中腹部分から中央円形部２６Ａの中心に向かって延び、それら複数の中央排出孔３０の前面開口は１つに纏められている。一方、複数の外縁排出孔３１は、前面区画壁２８の円形の外縁部に沿って円環状に等間隔に並べられている（図３（Ａ）参照）。そして、それら複数の外縁排出孔３１の中心軸が全て、塗料部屋２７の内部側面２７Ｓと平行になって延びている。さらには、各外縁排出孔３１の中心と回転霧化頭２０の中心とを含む平面で回転霧化頭２０を切断した切断面（図２に示した切断面）では、外縁排出孔３１のうち回転霧化頭２０の中心から最も離れた部分が塗料部屋２７と内部側面２７Ｓと面一になっている。 As shown in FIG. 1, a paint chamber 27 is formed in the bell-shaped flange portion 23 behind the central circular portion 26 A in the front end concave surface 26. The inner side surface 27S of the paint chamber 27 is a tapered surface whose diameter increases toward the front. A conical protrusion 28T protrudes from the inner surface of the front partition wall 28 that partitions the paint chamber 27 and the front end concave surface 26, that is, from the center of the inner front surface 27F of the paint chamber 27. Furthermore, a plurality of central discharge holes 30 and a plurality of outer edge discharge holes 31 are formed through the front partition wall 28. The plurality of central discharge holes 30 extend from the middle portion of the conical protrusion 28T toward the center of the central circular portion 26A, and the front openings of the plurality of central discharge holes 30 are combined into one. On the other hand, the plurality of outer edge discharge holes 31 are arranged in an annular shape at equal intervals along the circular outer edge portion of the front partition wall 28 (see FIG. 3A). The central axes of the plurality of outer edge discharge holes 31 all extend parallel to the inner side surface 27 S of the paint chamber 27. Furthermore, in the cut surface (cut surface shown in FIG. 2) which cut | disconnected the rotary atomization head 20 in the plane containing the center of each outer edge discharge hole 31 and the center of the rotation atomization head 20, The portion farthest from the center of the rotary atomizing head 20 is flush with the paint chamber 27 and the inner side surface 27S.

図１に示すように、塗料部屋２７と結合凹部２４Ｅとを区画する後面区画壁２９の中央には、後部センター孔３２が貫通形成されている。そして、後部センター孔３２に、塗料供給管１３のノズル部１３Ｃの先端部が突入している。また、塗料部屋２７の内部後面２７Ｒは、後部センター孔３２の開口縁に向かって迫り上がるように湾曲している。 As shown in FIG. 1, a rear center hole 32 is formed through the center of a rear partition wall 29 that partitions the paint chamber 27 and the coupling recess 24E. Then, the tip end portion of the nozzle portion 13 C of the paint supply pipe 13 enters the rear center hole 32. Further, the inner rear surface 27 R of the paint chamber 27 is curved so as to rise toward the opening edge of the rear center hole 32.

図２に示すように、回転霧化頭２０は、インナーハウジング５０とアウターハウジング４０とに分割されると共に、そのインナーハウジング５０が、前部インナーハウジング５１と後部インナーハウジング６０とに分割されている。具体的には、回転霧化頭２０のうち結合凹部２４Ｅより前側部分には、結合凹部２４Ｅより内径が段付き状に大きくなった中央組付孔４１が形成されている。そして、中央組付孔４１と結合凹部２４Ｅとが連通し、それら中央組付孔４１と結合凹部２４Ｅの外側部分が筒状のアウターハウジング４０になっている。また、インナーハウジング５０は、塗料部屋２７を内側に備え、中央組付孔４１内に組み付けられている。なお、本実施形態では、アウターハウジング４０は、例えばアルミ製であって、インナーハウジング５０は、例えば樹脂製となっている。 As shown in FIG. 2, the rotary atomizing head 20 is divided into an inner housing 50 and an outer housing 40, and the inner housing 50 is divided into a front inner housing 51 and a rear inner housing 60. . Specifically, a central assembly hole 41 having an inner diameter larger than the coupling recess 24E in a stepped shape is formed in a portion of the rotary atomizing head 20 in front of the coupling recess 24E. The central assembly hole 41 and the coupling recess 24E communicate with each other, and the outer portion of the central assembly hole 41 and the coupling recess 24E is a cylindrical outer housing 40. The inner housing 50 includes the paint chamber 27 on the inner side and is assembled in the central assembly hole 41. In the present embodiment, the outer housing 40 is made of aluminum, for example, and the inner housing 50 is made of resin, for example.

中央組付孔４１のうち結合凹部２４Ｅとの境界部分には、本発明に係る「後方当接部」に相当する後方当接面４１Ａが備えられ、その後方当接面４１Ａは、回転霧化頭２０の回転軸方向に直交する平坦面になっている。また、中央組付孔４１の内周面には、後側から順番に、奥側円筒部４１Ｂ、雌螺子部４１Ｃ（本発明の「螺合結合手段」に相当する）、中間円筒部４１Ｄ及び前端当接部４１Ｅが備えられている。そして、雌螺子部４１Ｃの螺子山が、奥側円筒部４１Ｂより内側に突出している。また、中間円筒部４１Ｄは、奥側円筒部４１Ｂより内径が大きな円筒面になっていて、中間円筒部４１Ｄと雌螺子部４１Ｃとの間の段差部分は、テーパー状になっている。前端当接部４１Ｅは、回転霧化頭２０の回転中心と平行な円筒面に対して僅かに傾斜して前方に向かって拡径したテーパー面になっている。さらに、前端当接部４１Ｅの前端部は、外側環状部２６Ｃのうち中間環状部２６Ｂ寄り位置に配置されている。 A rear abutment surface 41A corresponding to the “rear abutment portion” according to the present invention is provided in a boundary portion between the central assembly hole 41 and the coupling recess 24E, and the rear abutment surface 41A is rotational atomization. It is a flat surface orthogonal to the direction of the rotation axis of the head 20. Further, on the inner peripheral surface of the center assembly hole 41, in order from the rear side, a rear side cylindrical portion 41B, a female screw portion 41C (corresponding to the “screw coupling means” of the present invention), an intermediate cylindrical portion 41D, and A front end contact portion 41E is provided. And the screw thread of the female screw part 41C protrudes inward from the back side cylindrical part 41B. Further, the intermediate cylindrical portion 41D has a cylindrical surface having an inner diameter larger than that of the back cylindrical portion 41B, and a stepped portion between the intermediate cylindrical portion 41D and the female screw portion 41C is tapered. The front end abutting portion 41E is a tapered surface that is slightly inclined with respect to a cylindrical surface parallel to the rotation center of the rotary atomizing head 20 and is expanded in diameter toward the front. Further, the front end portion of the front end abutting portion 41E is disposed near the intermediate annular portion 26B in the outer annular portion 26C.

インナーハウジング５０は、前端部と後端部に前面区画壁２８と後面区画壁２９とを備えかつ、前面区画壁２８より前方に可撓筒壁５２が張り出した構造になっている。インナーハウジング５０の外周面のうち前後方向の中間部には、前面区画壁２８の側方部分に段差部５０Ｄが設けられ、インナーハウジング５０のうち段差部５０Ｄより後方に備えたベース軸部５４の中間位置に、雄螺子部５１Ｎ（本発明の「螺合結合手段」に相当する）が形成されている。また、段差部５０Ｄより前方にはベース軸部５４より外径が大きな嵌合軸部５３が備えられ、さらに、その嵌合軸部５３より前側が前記した可撓筒壁５２になっている。 The inner housing 50 includes a front partition wall 28 and a rear partition wall 29 at a front end portion and a rear end portion, and has a structure in which a flexible cylindrical wall 52 projects forward from the front partition wall 28. A stepped portion 50D is provided in a lateral portion of the front partition wall 28 in the middle portion in the front-rear direction of the outer peripheral surface of the inner housing 50, and the base shaft portion 54 provided behind the stepped portion 50D in the inner housing 50 is provided. A male screw portion 51N (corresponding to the “screw coupling means” of the present invention) is formed at an intermediate position. Further, a fitting shaft portion 53 having an outer diameter larger than that of the base shaft portion 54 is provided in front of the step portion 50D, and further, the front side of the fitting shaft portion 53 is the flexible cylindrical wall 52 described above.

そして、インナーハウジング５０は、中央組付孔４１に対して前方から組み付けられ、嵌合軸部５３が中央組付孔４１の中間円筒部４１Ｄに嵌合されることでアウターハウジング４０に対して心だしされている。また、インナーハウジング５０は、雄螺子部５１Ｎがアウターハウジング４０の雌螺子部４１Ｃに螺合することで中央組付孔４１内に保持され、インナーハウジング５０の後端面２９Ｒが後方当接面４１Ａに当接することでアウターハウジング４０に対して軸方向で位置決めされている。さらに、インナーハウジング５０の可撓筒壁５２は、縮径変形した状態で前端当接部４１Ｅに密着している。 The inner housing 50 is assembled from the front with respect to the central assembly hole 41, and the fitting shaft portion 53 is fitted into the intermediate cylindrical portion 41 D of the central assembly hole 41 so that the inner housing 50 is centered with respect to the outer housing 40. It has been started. Further, the inner housing 50 is held in the central assembly hole 41 by the male screw portion 51N being screwed into the female screw portion 41C of the outer housing 40, and the rear end surface 29R of the inner housing 50 is made to the rear contact surface 41A. By abutting, it is positioned in the axial direction with respect to the outer housing 40. Further, the flexible cylindrical wall 52 of the inner housing 50 is in close contact with the front end abutting portion 41E in a state where the diameter is reduced.

詳細には、以下の通りである。即ち、図５には、インナーハウジング５０が中央組付孔４１内に組み付けられかつ、可撓筒壁５２が縮径変形していない状態が拡大して示されている。同図に示すように、可撓筒壁５２の外周面であるテーパー面５２Ｔは、可撓筒壁５２の基端部で中央組付孔４１の前端当接部４１Ｅから僅かに離間し、可撓筒壁５２の先端部で前端当接部４１Ｅと干渉する形状になっている。即ち、可撓筒壁５２の先端部の外径は、前端当接部４１Ｅの最大の外径より僅かに大きくなっていて、それら可撓筒壁５２の先端部の外径と、前端当接部４１Ｅの最大の外径との差分だけ可撓筒壁５２が縮径変形して前端当接部４１Ｅに密着し、インナーハウジング５０と中央組付孔４１の内面との隙間が前端凹面２６側で閉塞されている。 The details are as follows. That is, FIG. 5 shows an enlarged view of a state in which the inner housing 50 is assembled in the central assembly hole 41 and the flexible cylindrical wall 52 is not deformed by a reduced diameter. As shown in the figure, the tapered surface 52T, which is the outer peripheral surface of the flexible cylindrical wall 52, is slightly separated from the front end abutting portion 41E of the central assembly hole 41 at the base end portion of the flexible cylindrical wall 52, and is allowed. The front end of the flexible tube wall 52 interferes with the front end contact portion 41E. That is, the outer diameter of the distal end portion of the flexible cylindrical wall 52 is slightly larger than the maximum outer diameter of the front end abutting portion 41E. The flexible cylindrical wall 52 is reduced in diameter by a difference from the maximum outer diameter of the portion 41E and is brought into close contact with the front end contact portion 41E, so that the gap between the inner housing 50 and the inner surface of the center assembly hole 41 is on the front end concave surface 26 side. Is blocked.

インナーハウジング５０は、塗料部屋２７における前後方向の中間位置で前部インナーハウジング５１と後部インナーハウジング６０とに２分割されている。具体的には、図５に示すように、前部インナーハウジング５１の後端部には、嵌合筒部５１Ｚが形成され、その嵌合筒部５１Ｚの奥部には、接合平坦面５１Ｓが形成されている。前部インナーハウジング５１の接合平坦面５１Ｓは、インナーハウジング５０の軸方向と直交した平坦面であって、塗料部屋２７における前後方向の略中央に位置している。また、前部インナーハウジング５１における塗料部屋２７の開口縁は、本発明の環状可撓壁５５になっていて、環状可撓壁５５のうち接合平坦面５１Ｓと塗料部屋２７の内部側面２７Ｓとが交差した角部は鋭角になっている。即ち、環状可撓壁５５は内側に向かうに従って薄くなっている。 The inner housing 50 is divided into a front inner housing 51 and a rear inner housing 60 at an intermediate position in the front-rear direction in the paint chamber 27. Specifically, as shown in FIG. 5, a fitting tube portion 51Z is formed at the rear end portion of the front inner housing 51, and a joining flat surface 51S is formed at the back of the fitting tube portion 51Z. Is formed. The joining flat surface 51 S of the front inner housing 51 is a flat surface orthogonal to the axial direction of the inner housing 50, and is located at the approximate center in the front-rear direction in the paint chamber 27. The opening edge of the paint chamber 27 in the front inner housing 51 is the annular flexible wall 55 of the present invention, and the joint flat surface 51S of the annular flexible wall 55 and the inner side surface 27S of the paint chamber 27 are formed. The intersecting corners are acute. That is, the annular flexible wall 55 becomes thinner toward the inner side.

嵌合筒部５１Ｚの内周面には、複数（例えば、４つ）の回転係合突部５７が周方向に等間隔に突出形成されている。それら回転係合突部５７は、図３（Ｂ）に示すように、接合平坦面５１Ｓから嵌合筒部５１Ｚの後端寄り位置に亘って延びている。また、図３（Ｃ）に示すように、各回転係合突部５７は、インナーハウジング５０の軸方向から見ると略台形になっている。なお、その略台形の上辺は、インナーハウジング５０の中心軸を中心とした円の一部をなしかつ、台形の両側辺は窪むように湾曲した円弧になっている。また、図３（Ｂ）に示すように、嵌合筒部５１Ｚの内周面のうち回転係合突部５７より後端側には、係止溝５９が全周に亘って形成されている。 A plurality (for example, four) of rotational engagement protrusions 57 are formed on the inner peripheral surface of the fitting cylinder part 51Z so as to protrude at equal intervals in the circumferential direction. As shown in FIG. 3B, these rotational engagement protrusions 57 extend from the joint flat surface 51S to a position near the rear end of the fitting cylinder portion 51Z. Further, as shown in FIG. 3C, each rotation engagement protrusion 57 has a substantially trapezoidal shape when viewed from the axial direction of the inner housing 50. The upper side of the substantially trapezoid forms a part of a circle centering on the central axis of the inner housing 50, and both sides of the trapezoid are curved arcs that are recessed. Further, as shown in FIG. 3B, a locking groove 59 is formed over the entire circumference on the rear end side of the rotation engagement protrusion 57 in the inner peripheral surface of the fitting cylinder portion 51Z. .

一方、後部インナーハウジング６０の先端部には、図５に示すように、前部インナーハウジング５１の嵌合筒部５１Ｚの内側に嵌合された嵌合軸部６０Ｚが設けられている。嵌合軸部６０Ｚの外周面のうち前後方向の中間位置から前端面にかけては、前記した複数の回転係合突部５７に対応させて、複数の回転係合凹部６３が陥没形成されている。それら回転係合凹部６３は、図４（Ａ）に示すように、後部インナーハウジング６０の軸方向から見た形状が、略台形になっていて、前部インナーハウジング５１と後部インナーハウジング６０とが合体すると、回転係合突部５７が回転係合凹部６３が係合して前部インナーハウジング５１と後部インナーハウジング６０とが一体回転可能に連結される。即ち、本実施形態では、これら回転係合突部５７と回転係合凹部６３とから本発明に係る「回転結合手段」が構成されている。 On the other hand, as shown in FIG. 5, a fitting shaft portion 60 Z fitted inside the fitting cylinder portion 51 Z of the front inner housing 51 is provided at the distal end portion of the rear inner housing 60. A plurality of rotation engaging recesses 63 are formed in a recessed manner from the intermediate position in the front-rear direction to the front end surface of the outer peripheral surface of the fitting shaft portion 60Z so as to correspond to the plurality of rotation engagement protrusions 57 described above. As shown in FIG. 4A, these rotational engagement recesses 63 have a substantially trapezoidal shape when viewed from the axial direction of the rear inner housing 60, and the front inner housing 51 and the rear inner housing 60 are separated from each other. When combined, the rotation engagement protrusion 57 engages with the rotation engagement recess 63, and the front inner housing 51 and the rear inner housing 60 are coupled so as to be integrally rotatable. That is, in the present embodiment, the rotation engagement protrusion 57 and the rotation engagement recess 63 constitute the “rotation coupling means” according to the present invention.

図４（Ｂ）に示すように、後部インナーハウジング６０の先端面は、内縁部が全体より前方に突出して当接平坦面６０Ｓになっている。そして、図５に示すように、当接平坦面６０Ｓが、環状可撓壁５５の先端部に後方から当接した状態で、環状可撓壁５５の基端部からは後部インナーハウジング６０の先端面が浮きかつ、回転係合突部５７も回転係合凹部６３内の後端面から浮くようになっている。 As shown in FIG. 4B, the front end surface of the rear inner housing 60 has a contact flat surface 60S with the inner edge projecting forward from the whole. As shown in FIG. 5, the front end of the rear inner housing 60 extends from the proximal end portion of the annular flexible wall 55 in a state where the contact flat surface 60 S is in contact with the distal end portion of the annular flexible wall 55 from behind. The surface floats, and the rotation engagement protrusion 57 also floats from the rear end surface in the rotation engagement recess 63.

嵌合軸部６０Ｚの外周面の基端寄り位置には、係止突条６４が嵌合軸部６０Ｚの全周に形成されている。そして、後部インナーハウジング６０の係止突条６４が前部インナーハウジング５１の係止溝５９に凹凸係合して前部インナーハウジング５１と後部インナーハウジング６０とが合体状態に仮保持される。即ち、本実施形態では、係止溝５９と係止突条６４とから本発明に係る「インナー仮保持手段」が構成されている。 Locking protrusions 64 are formed on the entire circumference of the fitting shaft portion 60Z at positions near the proximal end of the outer peripheral surface of the fitting shaft portion 60Z. Then, the locking protrusion 64 of the rear inner housing 60 engages with the locking groove 59 of the front inner housing 51 so that the front inner housing 51 and the rear inner housing 60 are temporarily held in a combined state. That is, in this embodiment, the “inner temporary holding means” according to the present invention is configured by the locking groove 59 and the locking protrusion 64.

図５に示すように、後部インナーハウジング６０の後端部の外周面からは側方に向かって後端フランジ６２が張り出している。そして、後部インナーハウジング６０の後端面２９Ｒは、後面区画壁２９から後端フランジ６２の先端まで面一の平坦面になっていて、その平坦面のうち後端フランジ６２寄り位置から後端フランジ６２の先端位置に亘る範囲が後方当接面４１Ａに当接している。また、後部インナーハウジング６０の後面のうち結合凹部２４Ｅに臨んだ部分には、複数（例えば、４つ）の工具係合孔６１（本発明の「工具係合部」に相当する）が陥没形成されている。図４（Ｃ）に示すように、工具係合孔６１は、後部インナーハウジング６０の中心軸を中心として円弧状をなしている。そして、図２に示すように、工具９０に備えた複数の係合突部９１を複数の工具係合孔６１に係合させてインナーハウジング５０をアウターハウジング４０に対して螺合操作することができる。 As shown in FIG. 5, a rear end flange 62 protrudes laterally from the outer peripheral surface of the rear end portion of the rear inner housing 60. The rear end surface 29R of the rear inner housing 60 is a flat surface from the rear partition wall 29 to the front end of the rear end flange 62, and the rear end flange 62 from the position near the rear end flange 62 in the flat surface. The range extending over the tip position of this is in contact with the rear contact surface 41A. Further, a plurality of (for example, four) tool engagement holes 61 (corresponding to the “tool engagement portion” of the present invention) are formed in a recessed manner in a portion of the rear surface of the rear inner housing 60 facing the coupling recess 24E. Has been. As shown in FIG. 4C, the tool engagement hole 61 has an arc shape with the central axis of the rear inner housing 60 as the center. As shown in FIG. 2, the inner housing 50 can be screwed into the outer housing 40 by engaging the plurality of engaging protrusions 91 provided in the tool 90 with the plurality of tool engaging holes 61. it can.

本実施形態の回転霧化頭２０の構成に関する説明は以上である。次に、この回転霧化頭２０の作用効果について説明する。回転霧化頭２０は、塗装ガン１０の筒形回転駆動シャフト１２に取り付けられて使用される。即ち、塗装ガン１０は、回転霧化頭２０を筒形回転駆動シャフト１２と共に回転駆動させた状態で、塗料部屋２７に第１供給路１３Ａから塗料、第２供給路１２Ａから溶剤を供給する。すると、塗料が塗料部屋２７内で溶剤と混合され、中央排出孔３０及び外縁排出孔３１から前端凹面２６上に排出される。そして、遠心力を受けた塗料が前端凹面２６の外縁部から前方に霧状になって放出される。 The description about the structure of the rotary atomizing head 20 of this embodiment is above. Next, the effect of the rotary atomizing head 20 will be described. The rotary atomizing head 20 is used by being attached to the cylindrical rotary drive shaft 12 of the coating gun 10. That is, the coating gun 10 supplies the paint from the first supply path 13A and the solvent from the second supply path 12A to the paint chamber 27 in a state where the rotary atomizing head 20 is rotationally driven together with the cylindrical rotary drive shaft 12. Then, the paint is mixed with the solvent in the paint chamber 27 and is discharged from the central discharge hole 30 and the outer edge discharge hole 31 onto the front end concave surface 26. And the coating material which received the centrifugal force is sprayed forward from the outer edge part of the front end concave surface 26, and is discharged | emitted.

ところで、塗装ガン１０の使用中に塗料の色替え等を行う場合には、第１供給路１３Ａから塗料の代わりに洗浄用の溶剤が塗料部屋２７に供給されて、回転霧化頭２０における塗料の通過経路が洗浄される。しかしながら、そのような簡易的な洗浄では、回転霧化頭２０を十分に洗浄することができない場合があるので、必要に応じて回転霧化頭２０を分解し、塗料部屋２７内を清掃する。 By the way, when the color of the paint is changed while the paint gun 10 is used, a cleaning solvent is supplied from the first supply path 13A to the paint chamber 27 instead of the paint, and the paint in the rotary atomizing head 20 is supplied. The passageway of is cleaned. However, with such simple cleaning, the rotary atomizing head 20 may not be sufficiently cleaned. Therefore, the rotary atomizing head 20 is disassembled as necessary and the inside of the paint chamber 27 is cleaned.

回転霧化頭２０を分解するには、回転霧化頭２０を塗装ガン１０の筒形回転駆動シャフト１２から取り外し、後部インナーハウジング６０の工具係合孔６１を、アウターハウジング４０の中央組付孔４１及び結合凹部２４Ｅを通して後方に露出させる。そして、図２に示すように、工具係合孔６１に工具９０の係合突部９１を係合させて、後部インナーハウジング６０をアウターハウジング４０に対して一方向に回転すればよい。すると、後部インナーハウジング６０と一体に前部インナーハウジング５１も回転してアウターハウジング４０との螺合が外れて、前部及び後部のインナーハウジング５１，６０がアウターハウジング４０の前方に離脱する。 In order to disassemble the rotary atomizing head 20, the rotary atomizing head 20 is removed from the cylindrical rotary drive shaft 12 of the coating gun 10, and the tool engagement hole 61 of the rear inner housing 60 is connected to the central assembly hole of the outer housing 40. 41 and the coupling recess 24E are exposed rearward. Then, as shown in FIG. 2, the engagement protrusion 91 of the tool 90 is engaged with the tool engagement hole 61, and the rear inner housing 60 is rotated in one direction with respect to the outer housing 40. Then, the front inner housing 51 also rotates integrally with the rear inner housing 60 to be unscrewed from the outer housing 40, and the front and rear inner housings 51, 60 are disengaged in front of the outer housing 40.

次いで、前部及び後部のインナーハウジング５１，６０を分離する。そのためには、例えば、前部インナーハウジング５１の段差部５０Ｄと後部インナーハウジング６０の後端フランジ６２とに指又は図示しない工具を引っ掛けて引き離せばよい。すると、係止溝５９と係止突条６４との係合が解除されて、前部及び後部のインナーハウジング５１，６０が分離する。これにより、塗料部屋２７が開放して、その内部を容易に清掃することができるようになる。 Next, the front and rear inner housings 51 and 60 are separated. For this purpose, for example, a finger or a tool (not shown) may be hooked and separated from the stepped portion 50D of the front inner housing 51 and the rear end flange 62 of the rear inner housing 60. Then, the engagement between the locking groove 59 and the locking protrusion 64 is released, and the front and rear inner housings 51 and 60 are separated. Thereby, the paint chamber 27 is opened, and the inside can be easily cleaned.

一方、回転霧化頭２０を合体させるには、分解操作とは逆に、前部インナーハウジング５１の嵌合筒部５１Ｚ内に後部インナーハウジング６０の嵌合軸部６０Ｚを押し込んで係止溝５９と係止突条６４とを係合させて、それら前部と後部のインナーハウジング５１，６０を合体状態に仮保持する。そして、前部インナーハウジング５１と後部インナーハウジング６０とからなるインナーハウジング５０をアウターハウジング４０の中央組付孔４１に前方から挿入し、中央組付孔４１に後方から挿入した工具９０をインナーハウジング５０（詳細には、後部インナーハウジング６０）の工具係合孔６１に係合させて、分解時と逆側に回転させる。すると、前部インナーハウジング５１とアウターハウジング４０との螺合が深まるに従って前部インナーハウジング５１が後方に移動し、アウターハウジング４０の後方当接面４１Ａと前部インナーハウジング５１との間で後部インナーハウジング６０が挟まれる。これにより、前部及び後部のインナーハウジング５１，６０が合体状態に本保持（固定）されると共に、アウターハウジング４０に対して位置決めされ、合体作業が完了する。 On the other hand, in order to unite the rotary atomizing head 20, contrary to the disassembling operation, the fitting shaft portion 60 Z of the rear inner housing 60 is pushed into the fitting cylinder portion 51 Z of the front inner housing 51 to lock the locking groove 59. And the locking protrusion 64 are engaged, and the front and rear inner housings 51, 60 are temporarily held in a combined state. Then, the inner housing 50 composed of the front inner housing 51 and the rear inner housing 60 is inserted into the central assembly hole 41 of the outer housing 40 from the front, and the tool 90 inserted from the rear into the central assembly hole 41 is inserted into the inner housing 50. (In detail, it is engaged with the tool engagement hole 61 of the rear inner housing 60 and is rotated to the opposite side to that during disassembly. Then, as the screwing between the front inner housing 51 and the outer housing 40 becomes deeper, the front inner housing 51 moves rearward, and the rear inner surface between the rear contact surface 41A of the outer housing 40 and the front inner housing 51 is increased. The housing 60 is sandwiched. As a result, the front and rear inner housings 51, 60 are fully held (fixed) in the combined state and positioned with respect to the outer housing 40, and the combined operation is completed.

このように本実施形態の回転霧化頭２０では、分解操作時及び合体操作時に、従来のように、塗料の通過経路が強く押されることがないので、分解及び合体を繰り返しても塗料の通過経路が変形・損傷することがなく、安定して塗料を霧化することが可能になる。また、分解及び合体に必要な工具９０を係合するための工具係合孔６１が、後部インナーハウジング６０の後端面２９Ｒに配置されているので、工具係合孔６１が塗料の霧化に悪影響を及ぼすこともない。 As described above, in the rotary atomizing head 20 of the present embodiment, during the disassembling operation and the coalescing operation, the paint passage is not pushed strongly as in the prior art. The path is not deformed / damaged, and the paint can be stably atomized. Moreover, since the tool engagement hole 61 for engaging the tool 90 required for disassembly and uniting is arranged in the rear end surface 29R of the rear inner housing 60, the tool engagement hole 61 has an adverse effect on the atomization of the paint. Does not affect.

しかも、本実施形態の回転霧化頭２０では、前部インナーハウジング５１と後部インナーハウジング６０とが係止溝５９と係止突条６４によって合体状態に仮保持されるので、アウターハウジング４０とインナーハウジング５０との螺合操作中に、そのインナーハウジング５０が前部と後部のインナーハウジング５１，６０に分離することが防がれ、螺合操作を容易に行うことができる。また、回転霧化頭２０が合体した状態では、アウターハウジング４０の後方当接面４１Ａと前部インナーハウジング５１との間で後部インナーハウジング６０が挟まれて、前部及び後部のインナーハウジング５１，６０が合体状態に本保持（固定）されるので、係止溝５９及び係止突条６４による仮保持力を小さくして仮保持操作及びその解除操作を容易に行うことができる。 Moreover, in the rotary atomizing head 20 of the present embodiment, the front inner housing 51 and the rear inner housing 60 are temporarily held in a combined state by the locking grooves 59 and the locking protrusions 64, so that the outer housing 40 and the inner During the screwing operation with the housing 50, the inner housing 50 is prevented from being separated into the front and rear inner housings 51, 60, and the screwing operation can be easily performed. When the rotary atomizing head 20 is combined, the rear inner housing 60 is sandwiched between the rear abutting surface 41A of the outer housing 40 and the front inner housing 51, and the front and rear inner housings 51, Since 60 is finally held (fixed) in the combined state, the temporary holding force by the locking groove 59 and the locking protrusion 64 can be reduced, and the temporary holding operation and the releasing operation can be easily performed.

さらには、前部インナーハウジング５１から前方に突出した可撓筒壁５２が、回転霧化頭２０の合体状態で縮径変形されて、その弾発力で中央組付孔４１の内面に押し付けられるので、回転霧化頭２０の前端面における前部インナーハウジング５１とアウターハウジング４０との間の分割面の隙間を確実に塞ぐことができる。また、前部インナーハウジング５１のうち塗料部屋２７の分割開口面に設けた環状可撓壁５５のうち薄くなった先端部に後部インナーハウジング６０の当接平坦面６０Ｓが当接し、環状可撓壁５５の基端部からは後部インナーハウジング６０が浮いた状態になるので、環状可撓壁５５が弾性変形して後部インナーハウジング６０に密着し、塗料部屋２７の内面における分割面の隙間を確実に塞ぐことができる。 Further, the flexible cylindrical wall 52 projecting forward from the front inner housing 51 is deformed in a reduced diameter in the combined state of the rotary atomizing head 20 and is pressed against the inner surface of the central assembly hole 41 by its elastic force. Therefore, it is possible to reliably close the gap between the split surfaces between the front inner housing 51 and the outer housing 40 on the front end surface of the rotary atomizing head 20. Further, the abutting flat surface 60S of the rear inner housing 60 abuts on the thinned end portion of the annular flexible wall 55 provided on the divided opening surface of the paint chamber 27 in the front inner housing 51, and the annular flexible wall. Since the rear inner housing 60 is in a floating state from the base end portion of 55, the annular flexible wall 55 is elastically deformed and is in close contact with the rear inner housing 60, so that the gap between the dividing surfaces on the inner surface of the paint chamber 27 is ensured. Can be closed.

［第２実施形態］
本実施形態の回転霧化頭２０Ｖは、図６及び図７に示されており、本発明に係る「回転結合手段」及び「インナー仮保持手段」の構成が第１実施形態と異なる。即ち、図７に示すように、前部インナーハウジング５１Ｖのうち嵌合筒部５１Ｚの内周面における後端部からは、例えば、断面円形の複数（例えば、４つ）の連結突部５８が内側に向かって突出形成されている。 [Second Embodiment]
The rotary atomizing head 20V of the present embodiment is shown in FIGS. 6 and 7, and the configurations of the “rotary coupling means” and the “inner temporary holding means” according to the present invention are different from those of the first embodiment. That is, as shown in FIG. 7, for example, a plurality of (for example, four) connecting protrusions 58 having a circular cross section are formed from the rear end portion of the inner peripheral surface of the fitting cylinder portion 51Z in the front inner housing 51V. Projecting inward.

一方、後部インナーハウジング６０Ｖのうち嵌合軸部６０Ｚの外周面には、連結突部５８に対応させて複数（例えば、４つ）の連結溝６４Ｖが形成されている。各連結溝６４Ｖは、後部インナーハウジング６０Ｖの前端面に開放しかつ後部インナーハウジング６０Ｖの軸方向に延びた縦溝部６４Ａと、その連結溝６４Ｖの後端部から周方向に延びた横溝部６４Ｂとを備えたＬ字形状をなしている。そして、例えば、嵌合筒部５１Ｚ内に嵌合軸部６０Ｚを嵌合することで、各連結溝６４Ｖにおける縦溝部６４Ａの後部まで各連結突部５８を受容することができ、前部インナーハウジング５１Ｖに対して後部インナーハウジング６０Ｖを一方向（例えば、回転霧化頭２０Ｖの合体操作時に後部インナーハウジング６０Ｖを回転させる方向）に回転させることで、各連結突部５８を連結溝６４Ｖにおける横溝部６４Ｂの奥部まで受容することができる。 On the other hand, a plurality of (for example, four) connection grooves 64V are formed on the outer peripheral surface of the fitting shaft portion 60Z in the rear inner housing 60V so as to correspond to the connection protrusions 58. Each connection groove 64V is open to the front end surface of the rear inner housing 60V and extends in the axial direction of the rear inner housing 60V, and a horizontal groove portion 64B extends in the circumferential direction from the rear end portion of the connection groove 64V. It is L-shaped with For example, by fitting the fitting shaft portion 60Z into the fitting cylinder portion 51Z, each connecting projection 58 can be received up to the rear portion of the longitudinal groove portion 64A in each connecting groove 64V, and the front inner housing By rotating the rear inner housing 60V in one direction with respect to 51V (for example, the direction in which the rear inner housing 60V is rotated when the rotary atomizing head 20V is combined), the connecting protrusions 58 are lateral groove portions in the connecting groove 64V. It can be received up to the depth of 64B.

そして、連結突部５８と連結溝６４Ｖとの係合によって、図６に示すように、前部インナーハウジング５１Ｖと後部インナーハウジング６０Ｖとが一体回転可能に連結されかつ合体状態に仮保持される。即ち、本実施形態では、本発明に係る「回転結合手段」及び「インナー仮保持手段」が共に連結突部５８及び連結溝６４Ｖによって構成されている。このような構成にすれば、第１実施形態と同様の作用効果を奏する。
［他の実施形態］ Then, as shown in FIG. 6, the front inner housing 51V and the rear inner housing 60V are connected so as to be integrally rotatable and temporarily held in a combined state by the engagement between the connecting protrusion 58 and the connecting groove 64V. That is, in the present embodiment, both the “rotary coupling means” and the “inner temporary holding means” according to the present invention are constituted by the coupling protrusion 58 and the coupling groove 64V. With such a configuration, the same effects as those of the first embodiment can be obtained.
[Other Embodiments]

本発明は、前記実施形態に限定されるものではなく、例えば、以下に説明するような実施形態も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。 The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

（１）前記第１実施形態の回転霧化頭２０から係止溝５９と係止突条６４とを排除して、前部と後部のインナーハウジング５１，６０が合体状態に仮保持されない構成にしてもよいし、前記第２実施形態の回転霧化頭２０Ｖの連結溝６４Ｖから横溝部６４Ｂを排除して、前部と後部のインナーハウジング５１Ｖ，６０Ｖが合体状態に仮保持されない構成にしてもよい。 (1) The locking groove 59 and the locking protrusion 64 are excluded from the rotary atomizing head 20 of the first embodiment, and the front and rear inner housings 51, 60 are not temporarily held in a combined state. Alternatively, the lateral groove 64B is excluded from the connection groove 64V of the rotary atomizing head 20V of the second embodiment, and the front and rear inner housings 51V and 60V are not temporarily held in a combined state. Good.

（２）前記第１実施形態では、塗料部屋２７の前後方向における略中央に前部と後部のインナーハウジング５１，６０の分割面が配置されていたが、それら前部と後部のインナーハウジングの分割面は塗料部屋の前端部又は後端部に配置されていてもよい。 (2) In the first embodiment, the divided surfaces of the front and rear inner housings 51 and 60 are arranged at the approximate center in the front-rear direction of the paint chamber 27. However, the front and rear inner housings are divided. The surface may be arranged at the front end or the rear end of the paint chamber.

（３）また、例えば、塗料の粘性や塗料の噴出量等に応じて、中央排出孔３０及び外縁排出孔３１の形状、孔径、数等を異ならせた複数種類のインナーハウジングを備えておき、それら複数種類のインナーハウジングを共通のアウターハウジングに合体可能としてもよい。そうすれば、複数種類のインナーハウジングの間でアウターハウジングを兼用することができ、コスト低減が図られる。 (3) Further, for example, a plurality of types of inner housings having different shapes, hole diameters, numbers, and the like of the central discharge hole 30 and the outer edge discharge holes 31 according to the viscosity of the paint, the amount of the paint ejected, and the like are provided. The plurality of types of inner housings may be combined into a common outer housing. If it does so, an outer housing can be shared between several types of inner housings, and cost reduction is achieved.

１０塗装ガン
２０，２０Ｖ回転霧化頭
２７塗料部屋
４０アウターハウジング
４１中央組付孔
４１Ａ後方当接面（後方当接部）
４１Ｃ雌螺子孔（螺合結合手段）
５０インナーハウジング
５１，５１Ｖ前部インナーハウジング
５１Ｎ雄螺子部（螺合結合手段）
５１Ｖ前部インナーハウジング
５１Ｖ，６０Ｖインナーハウジング
５２可撓筒壁
５５環状可撓壁
５７回転係合突部（回転結合手段）
５８連結突部（回転結合手段、インナー仮保持手段）
５９係止溝（インナー仮保持手段）
６０，６０Ｖ後部インナーハウジング
６１工具係合孔（工具係合部）
６３回転係合凹部（回転結合手段）
６４係止突条（回転結合手段、インナー仮保持手段）
６４Ｖ連結溝
９０工具 DESCRIPTION OF SYMBOLS 10 Coating gun 20,20V Rotating atomizing head 27 Paint chamber 40 Outer housing 41 Center assembly hole 41A Back contact surface (back contact part)
41C Female screw hole (screw coupling means)
50 Inner housing 51, 51V Front inner housing 51N Male screw part (screw coupling means)
51V Front inner housing 51V, 60V Inner housing 52 Flexible cylindrical wall 55 Annular flexible wall 57 Rotating engagement protrusion (rotating coupling means)
58 Connecting projection (rotary coupling means, inner temporary holding means)
59 Locking groove (Inner temporary holding means)
60, 60V Rear inner housing 61 Tool engagement hole (tool engagement portion)
63 Rotation engagement recess (rotation coupling means)
64 Locking ridge (rotary coupling means, inner temporary holding means)
64V connecting groove 90 tool

Claims

A rotary atomizing head having a paint chamber as a part of a passage path of paint at a rotation center portion, being detachably attached to a paint gun and driven to rotate,
The inner housing is divided into an inner housing having an interior of the paint chamber and an outer housing having a central assembly hole capable of receiving the inner housing from the front, and the inner housing has a front inner housing in the front-rear direction. In the rotary atomizing head that is divided into a rear inner housing and can open the paint chamber,
A screw coupling means for screwing the front inner housing and the outer housing;
Rotation coupling means for coupling the front inner housing and the rear inner housing so as to be integrally rotatable;
A tool engaging portion formed on a rear end surface exposed rearward through the central assembly hole in the rear inner housing, and capable of engaging a tool for rotating the rear inner housing;
A rotary atomizing head comprising a rear abutting portion formed on the outer housing and sandwiching the rear inner housing in the front-rear direction with the front inner housing.

2. The rotary atomizing head according to claim 1, further comprising an inner temporary holding means capable of holding the front inner housing and the rear inner housing in a combined state outside the center assembly hole.

A flexible cylindrical wall that protrudes forward from the outer edge of the front end of the front inner housing and gradually decreases toward the tip, and is deformed to a reduced diameter and pressed against the inner surface of the central assembly hole. The rotary atomizing head according to claim 1 or 2, characterized in that.

The dividing surface of the front inner housing and the rear inner housing is disposed at an intermediate portion in the front-rear direction of the paint chamber,
On the opening edge of the paint chamber in one of the dividing surfaces of the front inner housing and the rear inner housing, an annular flexible wall that is gradually thinned inward is provided.
The other split surface is brought into contact with the distal end portion of the annular flexible wall from the front-rear direction and floated from the proximal end portion of the annular flexible wall. Rotating atomizing head according to item.

5. The apparatus according to claim 1, comprising a plurality of types of inner housings having different shapes, wherein any one of the plurality of types of inner housings can be combined with the outer housing. Rotating atomizing head described in 1.