JP3737731B2 - Paint nozzle fitting for air spray gun and air spray gun using the same - Google Patents

Paint nozzle fitting for air spray gun and air spray gun using the same Download PDF

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JP3737731B2
JP3737731B2 JP2001307851A JP2001307851A JP3737731B2 JP 3737731 B2 JP3737731 B2 JP 3737731B2 JP 2001307851 A JP2001307851 A JP 2001307851A JP 2001307851 A JP2001307851 A JP 2001307851A JP 3737731 B2 JP3737731 B2 JP 3737731B2
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Prior art keywords
nozzle
paint
fitting
spray gun
air spray
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JP2003112086A (en
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浩二 福田
久徳 大橋
貴律 吉田
和吉 渕田
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Meiji Air Compressor Mfg Co Ltd
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Meiji Air Compressor Mfg Co Ltd
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    • 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
    • B05B7/0807—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 to form intersecting jets
    • B05B7/0815—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 to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
    • B05B15/18—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts for improving resistance to wear, e.g. inserts or coatings; for indicating wear; for handling or replacing worn parts
    • 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
    • B05B7/24—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 with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2405—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
    • B05B7/2435—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle the carried liquid and the main stream of atomising fluid being brought together by parallel conduits placed one inside the other

Description

【０００１】
【発明の属する技術分野】
本発明は、塗料ノズル口からの塗料を圧縮空気により霧化噴出するエアスプレーガン用の塗料ノズル金具、およびそれを用いたエアスプレーガンに関する。
【０００２】
【従来の技術、及び発明が解決しようとする課題】
エアスプレーガンは、図４に略示するように、ニードル弁ａによって開閉する塗料ノズル口ｂを有する塗料ノズル金具ｃと、圧縮空気が噴出する空気孔ｄを有する空気キャップｅとを用い、前記塗料ノズル口ｂから吐出される塗料を、前記空気孔ｄからの空気によって霧吹き状に吹き付けている。
【０００３】
そのため、前記塗料ノズル金具ｃでは、高速で噴出する塗料によって、塗料ノズル口ｂを含む先端部ｃ１が非常に摩耗しやすく、頻繁な交換が要求される。
【０００４】
従って、近年、この塗料ノズル金具ｃの使用寿命を高めるべく、例えばタングステンカーバイト（超硬）やセラミック等の耐摩耗性材料によって先端部用のチップを形成するとともに、このチップを、蝋付け、接着、或いは圧入などの固着手段によってノズル本体に一体化したものが出現している。
【０００５】
しかし、このように一体化したものでは、チップが摩耗した際、ノズル本体とともに廃棄する必要があるなど不経済である。又前記固着手段では、固着時、曲がりや変形が生じやすく、ノズル本体とチップとの間の同芯度を高く確保することが難しい。そのため、良品率が悪くなりコスト的に高いものとなっている。
【０００６】
そこで本発明は、先端部用のノズルチップを、ノズル本体に交換可能に固定することを基本として、前記問題点を解決しうるエアスプレーガン用の塗料ノズル金具、およびそれを用いたエアスプレーガンの提供を目的としている。
【０００７】
【課題を解決するための手段】
前記課題を解決するために本件請求項１に係る発明は、エアスプレーガンのガン本体に取付けられかつ前端の塗料ノズル口から吐出される塗料がガン本体からの空気により霧化噴出するエアスプレーガン用の塗料ノズル金具であって、
ガン本体に取り換え可能に固定されかつガン本体の塗料流路に連通する中心孔を有するノズル本体と、前記中心孔に通じかつガン本体の針弁の接離により開閉される弁座の前端に前記塗料ノズル口を設けたノズル孔を有するノズルチップとからなり、かつ該ノズルチップを、前記ノズル本体に交換可能に固定することを特徴としている。
【０００８】
さらに請求項１に係る発明では、前記ノズル本体は、前端側外周にガン本体との間をシールする鍔部を形成しかつ該鍔部の前端側に外ネジを有する固定部が突出した管状の基部を具えている。
【０００９】
又請求項１に係る発明は、前記ノズルチップが、外周に外フランジ部を有し、前記ノズル本体の前記固定部に螺着するロックナットにより外フランジ部の前面をノズル本体に向けて押圧することによってノズルチップを、前記ノズル本体に交換可能に固定することを特徴とする。
【００１０】
又請求項２に係る発明は、前記ノズルチップが、前記外フランジ部と前記ノズル本体との間にパッキン部材を介在することを特徴とする。
【００１１】
請求項３に係る発明は、前記ノズルチップが、耐摩耗性材料からなることを特徴としている。
【００１２】
さらに請求項４に係る発明は、前記ノズルチップとノズル本体とは、嵌合することによって同心に位置合わせされる嵌合部を有することを特徴とする。
【００１３】
又請求項５は、エアスプレーガンの発明であって、前記請求項１〜４のいずれかに記載の塗料ノズル金具を具えたことを特徴としている。
【００１４】
【発明の実施の形態】
以下、本発明の実施の一形態を、図示例とともに説明する。図１は、本発明の塗料ノズル金具を用いたエアスプレーガンの断面図である。
【００１５】
図１において、エアプレーガン１は、ガン本体２の前端に、塗料ノズル金具３と空気キャップ４とを取付けてなり、前記塗料ノズル金具３の塗料ノズル口５から吐出される塗料を、空気キャップ４の空気ノズル口６からの圧縮空気によって霧化噴出する。
【００１６】
前記ガン本体２は、本例では、周知構造をなし、把部２Ａに設ける空気取入口２１から流入する圧縮空気を、このガン本体２の内部を通る空気流路２２を経て前端部２Ｂに導くとともに、該空気流路２２には、引き金２３の操作によって開閉される空気弁２４が介在する。
【００１７】
又前記ガン本体２の前端部２Ｂには、その前端面で開口しかつ後方に向かってのびる塗料ノズル取付け穴２５が形成される。
【００１８】
この塗料ノズル取付け穴２５は、図２に示すように、前記塗料ノズル金具３を取り替え可能に螺着するノズル取付け部２５Ａを具え、その後端側には、ガン本体２の前記前端部２Ｂ下端に設ける塗料取入口２６に、縦孔２０を介して連なる延長部２５Ｂが延設される。従って、本例では、該延長部２５Ｂと縦孔２０と塗料取入口２６とによって、ガン本体２の塗料流路２７を構成している。
【００１９】
又前記ノズル取付け部２５Ａの前端側には、第１、第２の円周溝２８Ａ、２８Ｂが段差２９を介して同心に形成される。この第１の円周溝２８Ａには、本例では、空気調整弁３１を介してガン本体２の前記空気流路２２に通じる開口部３２Ａが形成されるとともに、前記第２の円周溝２８Ｂには、前記空気調整弁３１よりも上流側で、継ぎ溝３３を介して前記空気流路２２に通じる開口部３２Ａが形成される。
【００２０】
そして、本発明では、前記塗料ノズル金具３は、図２，３に示すように、前記塗料ノズル取付け穴２５に取り換え可能に固定されるノズル本体８と、このノズル本体８の中心孔９に通じるノズル孔１０を有するノズルチップ１１とを含んで形成される。
【００２１】
詳しくは、前記ノズル本体８は、前記塗料流路２７に連通する中心孔９を有する管状の基部１２を具え、その後端側外周には、前記ノズル取付け部２５Ａに螺着される外ネジを有する装着部１２Ａを設けるとともに、その前端側外周には、鍔部１２Ｂを形成している。なお該鍔部１２Ｂのさらに前端側には、ノズルチップ１１を交換可能に固定する外ネジを有する固定部１２Ｃが突出している。
【００２２】
ここで、前記鍔部１２Ｂは、本例では、前端側から後端側に向かって段付き状に直径を減じて連なる第１〜第３の鍔部分Ｂ１〜Ｂ３を具える。このうち、第３の鍔部分Ｂ３の裏面（後面）には、例えばＯリング等であるパッキン部材３０Ａを収容することにより、前記段差２９（本例では、第１の円周溝２８Ａの底面に相当）との間をシールしうる本体シール部１３を形成している。
【００２３】
又前記第２、第３の鍔部分Ｂ２、Ｂ３の外周面と第１の円周溝２８Ａの内周面との間、及び第１の鍔部分Ｂ１の裏面（後面）とガン本体２の前端面との間には、夫々間隙ｇが形成される。即ち、前記鍔部１２Ｂは、前記本体シール部１３よりも半径方向外周側の裏面とガン本体２との間に、前記間隙ｇを形成するとともに、この間隙ｇによって、前記空気流路２２をへて前記開口部３２Ａから流入するパターン形成用の空気を、空気キャップ４のパターン空気口３４に流す環状のパターン空気流路３５を形成する。
【００２４】
さらに前記鍔部１２Ｂは、前記本体シール部１３よりも半径方向内周側の裏面に、塗料を霧化吐出する空気を該鍔部１２Ｂの前に流す霧化空気孔３６を開口している。この霧化空気孔３６は、周方向に略等間隔で配される複数（本例では６個）の小孔からなり、前記鍔部１２Ｂを前後に貫通することにより、前記空気流路２２から前記開口部３２Ｂ及び第２の円周溝２８Ｂを通って流入する霧化用の空気を、空気キャップ４の空気ノズル口６に供給する。
【００２５】
又前記ノズルチップ１１は、ノズル本体８に螺着するロックナット１４を介して交換可能に固定される。
【００２６】
このノズルチップ１１は、前記ノズル孔１０を有するとともに、その外周には、前記ノズル本体８の前端面に、本例ではパッキン部材３０Ｂを介して当接する鍔状の外フランジ部１１Ａを形成している。
【００２７】
なお前記ノズル孔１０は、ノズル本体８の前記中心孔９に、本例では、継ぎ部１０Ａを介して連なる先細コーン状の弁座１０Ｂと、この弁座１０Ｂの前端に設けられる小径な塗料ノズル口５とを有する。そして、前記弁座１０Ｂは、ガン本体２の針弁３７と接離することにより、前記ノズル孔１０を開閉する。なお前記針弁３７は、周知構造をなし、前記引き金２３の一つの引き操作によって前記空気弁２４と同調して作動する。
【００２８】
又ノズルチップ１１は、前記外フランジ部１１Ａよりも前端側では、先細コーン状の絞り部１１Ｂを介して、前記塗料ノズル口５が開口する小径なノズル部１１Ｃを延設する一方、前記外フランジ部１１Ａよりも後端側には、嵌合筒部１１Ｄを延設している。この嵌合筒部１１Ｄは、その外周面が、前記中心孔９の前端で段付き状に形成する周溝状の嵌合溝部９Ａの内周面と嵌合でき、これによって、前記中心孔９とノズル孔１０とを互いに同心に精度良く位置合わせしうる。即ち、前記嵌合筒部１１Ｄと嵌合溝部９Ａとは、嵌合することによってノズルチップ１１とノズル本体８とを同心に位置合わせする嵌合部１５を構成している。なお、前記嵌合溝部９Ａの形成は、前記継ぎ部１０Ａと中心孔９との内径差を減じ、塗料流れを円滑化する上でも好ましい。
【００２９】
又前記ロックナット１４は、ノズル本体８の前記固定部１２Ｃに螺着する内ネジを有する筒状のナット部１４Ａの前端に、半径方向内方に突出ことにより前記外フランジ部１１Ａの前面と係合する内フランジ部１４Ｂを設けている。そして、前記固定部１２Ｃへの螺着による外フランジ部１１Ａ前面への押圧によって、ノズルチップ１１をノズル本体８に交換可能に固定できる。なお本例では、前記螺着時、前記嵌合筒部１１Ｄ後端が嵌合溝部９Ａ底面に当接することにより、長手方向に位置決めされる場合を例示しているが、固定部１２Ｃの前端面と内フランジ部１４Ｂとの間で前記外フランジ部１１Ａを狭圧保持させても良い。このとき、前記パッキン部材３０Ｂとして、テフロン、ナイロン等の合成樹脂製のものを使用する。
【００３０】
このように、前記ノズルチップ１１を交換可能としたため、該ノズルチップ１１を、ノズル本体８とは異なる材料、例えば耐摩耗性材料によって形成することができ、摩耗寿命を向上できる。又前記ノズルチップ１１が摩耗した際にも、このノズルチップ１１のみの交換によって対応でき、ノズル本体８をそのまま使用しうるなど経済的にも有利である。なお耐摩耗性材料としては、超硬合金、セラミック、及び表面に窒化法、浸炭法などの硬化処理を施した表面処理材等が適宜採用できる。
【００３１】
又ノズルチップ１１とノズル本体８とは、嵌合部１５による相互の嵌合によって、優れた同芯度を確保しつつ能率良くかつ簡便に連結することが可能であり、従来の如く、蝋付け、接着、圧入等で固着する際に生じた、曲がりや変形等の発生がなくなり、高精度、高品質の塗料ノズル金具を、歩留まり良く低コストで提供することができる。
【００３２】
又ノズルチップ１１として、プラスチック、ゴム、及び軟窒化などの軟化処理を施した軟質材料を採用することもでき、係る場合には、針弁３７による塗料の止まり性を向上でき、例えば低粘度の塗料を使用する際の塗装作業性を改善しうる。なお、前記耐摩耗性材料、及び軟質材料とは、前記ノズル本体８に比して、耐摩耗性の高い材料、及び軟質の材料を含む。
【００３３】
又塗料ノズル口５の口径のみを変更し、例えば塗料粘度に起因する塗料の吐出量や塗装厚さの変化を調整するために、ノズルチップ１１を交換することも可能となる。
【００３４】
次に、前記空気キャップ４は、前記ロックナット１４と略同構成のロックナット４０を介してガン本体２に着脱自在に取付けられる。この空気キャップ４は、周知構造をなし、その背面に、前記塗料ノズル金具３を収容して覆う凹み部１７を具える。又該凹み部１は、その周縁部１７Ａが前記第３の鍔部分Ｂ１前面と当接する。これによって、周縁部１７Ａの半径方向内側では、前記凹み部１７と塗料ノズル金具３とで囲む第１の空気溜まり１８Ａを形成するとともに、周縁部１７Ａの半径方向外側では、ガン本体２の前端面と、ロックナット４０内周面と空気キャップ４の背面とで囲む第２の空気溜まり１８Ｂを形成している。
【００３５】
又空気キャップ４は、その前面に、前記ノズルチップ１１の先端を囲む環状の空気ノズル口６と、この空気ノズル口６を挟んだ両側に配される補助孔３８とを具えるとともに、該補助孔３８よりも半径方向外側でかつ前方側に突出する一対の角部３９には、前記パターン空気口３４を内向きに形成している。
【００３６】
ここで、前記パターン空気口３４は、前記第２の空気溜まり１８Ｂを介して前記パターン空気流路３５に導通する。又前記空気ノズル口６と補助孔３８とは、前記第１の空気溜まり１８Ａを介して前記霧化空気孔３６に導通している。このとき、霧化空気孔３６を前記ロックナット１４の背面に向いて開口させるのが好ましい。それは、前記霧化空気孔３６からの空気が、いったんロックナット１４に当たって攪拌するなど空気溜まり１８Ａ内の空気を均一化でき、従って、塗料の霧化噴出を安定化できるからである。
【００３７】
なお前記ロックナット４０は、ガン本体２の前端部２Ｂに螺着される筒状のナット部４０Ａの前端に、前記空気キャップ４の外周に設ける外フランジ部４Ａの前面と係合する内フランジ部４０Ｂを具え、前記螺着による外フランジ部４Ａへの押圧により空気キャップ４を交換可能に固定する。
【００３８】
以上、本発明の特に好ましい実施形態について詳述したが、本発明は、図示の実施形態に限定されることなく、種々の態様に変形して実施しうる。
【００３９】
【発明の効果】
叙上の如く本発明は、塗料ノズル口を有するノズルチップを、ノズル本体に交換可能に固定しているため、ノズルチップを、ノズル本体とは異なる材料、例えば耐摩耗性材料によって形成することができ、摩耗寿命を向上できる。又前記ノズルチップが摩耗した際にも、このノズルチップのみの交換で良く、ノズル本体をそのまま使用しうるため経済的にも有利である。
【００４０】
又ノズルチップとして軟質材料を採用することもでき、係る場合には、針弁による塗料の止まり性を向上でき、例えば低粘度の塗料を使用する際の塗装作業性を改善しうる。
【００４１】
又従来の如く、蝋付け、接着、圧入等で固着する際に生じた、曲がりや変形等の発生を排除しうるため、高精度、高品質の塗料ノズル金具を、歩留まり良く低コストで提供することができる。
【図面の簡単な説明】
【図１】本発明の塗料ノズル金具を用いたエアプレーガンの一実施例を示す断面図である。
【図２】その主要部を拡大して示す断面図である。
【図３】塗料ノズル金具の分解斜視図である。
【図４】従来技術を説明する略断面図である。
【符号の説明】
１ エアスプレーガン
２ ガン本体
３ 塗料ノズル金具
５ 塗料ノズル口
９ 中心孔
８ ノズル本体
１０ ノズル孔
１０Ｂ 弁座
１１ ノズルチップ
１１Ａ 外フランジ部
１２Ｂ 鍔部
１３ 本体シール部
１４ ロックナット
１５ 嵌合部
２７ 塗料流路
３０Ｂ パッキン部材
３５ パターン空気流路
３６ 霧化空気孔
３７ 針弁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paint nozzle fitting for an air spray gun that atomizes and jets paint from a paint nozzle port with compressed air, and an air spray gun using the same.
[0002]
[Background Art and Problems to be Solved by the Invention]
As shown schematically in FIG. 4, the air spray gun uses a paint nozzle fitting c having a paint nozzle port b that is opened and closed by a needle valve a, and an air cap e having an air hole d through which compressed air is ejected. The paint discharged from the paint nozzle port b is sprayed in the form of a mist by the air from the air hole d.
[0003]
For this reason, in the paint nozzle fitting c, the tip portion c1 including the paint nozzle port b is very easily worn by the paint ejected at high speed, and frequent replacement is required.
[0004]
Therefore, in recent years, in order to increase the service life of the paint nozzle fitting c, for example, a tip tip is formed of a wear-resistant material such as tungsten carbide (carbide) or ceramic, and the tip is brazed. Some have been integrated into the nozzle body by adhering or fixing means such as press fitting.
[0005]
However, such an integrated one is uneconomical because it needs to be discarded together with the nozzle body when the tip is worn. Further, the fixing means tends to bend and deform during fixing, and it is difficult to ensure a high concentricity between the nozzle body and the tip. Therefore, the yield rate is poor and the cost is high.
[0006]
Therefore, the present invention is based on fixing a nozzle tip for a tip portion to a nozzle body in a replaceable manner, and a paint nozzle fitting for an air spray gun capable of solving the above-mentioned problems, and an air spray gun using the same The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is an air spray gun which is attached to a gun body of an air spray gun and in which paint discharged from a paint nozzle port at the front end is atomized and ejected by air from the gun body. Paint nozzle fittings for
A nozzle body having a center hole that is removably fixed to the gun body and communicates with a paint flow path of the gun body, and a front end of a valve seat that is connected to and separated from the center hole and is opened and closed by a needle valve of the gun body. Ri Do and a nozzle tip having a nozzle hole formed paint nozzle opening, and the nozzle tip, is characterized in that replaceably secured to the nozzle body.
[0008]
Further, in the invention according to claim 1, the nozzle body has a tubular shape in which a flange portion that seals between the gun body and the front end side of the nozzle body is formed on the outer periphery of the front end side, and a fixing portion having an external screw protrudes from the front end side of the flange portion. Has a base.
[0009]
In the invention according to claim 1, the nozzle tip has an outer flange portion on the outer periphery, and the front surface of the outer flange portion is pressed toward the nozzle body by a lock nut screwed to the fixing portion of the nozzle body. Thus, the nozzle tip is fixed to the nozzle body in a replaceable manner.
[0010]
The invention according to claim 2 is characterized in that the nozzle tip has a packing member interposed between the outer flange portion and the nozzle body.
[0011]
The invention according to claim 3 is characterized in that the nozzle tip is made of a wear-resistant material.
[0012]
Further, the invention according to claim 4 is characterized in that the nozzle tip and the nozzle body have a fitting portion that is concentrically aligned by fitting .
[0013]
A fifth aspect of the invention is an invention of an air spray gun, characterized in that the paint nozzle fitting according to any one of the first to fourth aspects is provided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an air spray gun using the paint nozzle fitting of the present invention.
[0015]
In FIG. 1, an air play gun 1 has a paint nozzle fitting 3 and an air cap 4 attached to the front end of a gun body 2, and paint discharged from a paint nozzle port 5 of the paint nozzle fitting 3 is supplied with an air cap. Atomized and ejected by compressed air from the four air nozzle ports 6.
[0016]
In this example, the gun body 2 has a well-known structure, and the compressed air flowing from the air inlet 21 provided in the grip portion 2A is guided to the front end portion 2B through the air flow path 22 passing through the inside of the gun body 2. In addition, an air valve 24 that is opened and closed by the operation of the trigger 23 is interposed in the air flow path 22.
[0017]
The front end 2B of the gun body 2 is formed with a paint nozzle mounting hole 25 that opens at the front end and extends rearward.
[0018]
As shown in FIG. 2, the paint nozzle mounting hole 25 includes a nozzle mounting portion 25A for screwing the paint nozzle metal fitting 3 so that the paint nozzle fitting 3 can be replaced, and the rear end side is provided with a lower end of the front end portion 2B of the gun body 2. An extension portion 25 </ b> B that extends through the vertical hole 20 is extended to the paint intake 26 to be provided. Therefore, in this example, the extension portion 25 </ b> B, the vertical hole 20, and the paint intake 26 constitute a paint flow path 27 of the gun body 2.
[0019]
Further, first and second circumferential grooves 28A and 28B are formed concentrically through a step 29 on the front end side of the nozzle mounting portion 25A. In this example, the first circumferential groove 28A is formed with an opening 32A communicating with the air flow path 22 of the gun body 2 via the air regulating valve 31, and the second circumferential groove 28B. Is formed with an opening 32 </ b> A that communicates with the air flow path 22 via the joint groove 33 on the upstream side of the air regulating valve 31.
[0020]
In the present invention, as shown in FIGS. 2 and 3, the paint nozzle fitting 3 communicates with the nozzle body 8 that is removably fixed to the paint nozzle mounting hole 25 and the center hole 9 of the nozzle body 8. And a nozzle tip 11 having a nozzle hole 10.
[0021]
Specifically, the nozzle body 8 includes a tubular base portion 12 having a center hole 9 communicating with the paint flow path 27, and has an outer screw that is screwed to the nozzle mounting portion 25A on the outer periphery on the rear end side. A mounting portion 12A is provided, and a flange portion 12B is formed on the outer periphery on the front end side. Further, a fixing portion 12C having an external screw for fixing the nozzle tip 11 in a replaceable manner projects from the front end side of the flange portion 12B.
[0022]
Here, in the present example, the flange portion 12B includes first to third flange portions B1 to B3 that are continuously reduced in diameter from the front end side toward the rear end side. Among these, the back surface (rear surface) of the third flange portion B3 accommodates a packing member 30A such as an O-ring, for example, so that the step 29 (in this example, on the bottom surface of the first circumferential groove 28A). A main body seal portion 13 is formed that can seal a gap between the main body and the like.
[0023]
Also, between the outer peripheral surface of the second and third flange portions B2 and B3 and the inner peripheral surface of the first circumferential groove 28A, and the back surface (rear surface) of the first flange portion B1 and the front end of the gun body 2 A gap g is formed between each surface. That is, the flange portion 12B forms the gap g between the back surface on the outer peripheral side in the radial direction with respect to the main body seal portion 13 and the gun body 2, and the air flow path 22 passes through the gap g. Thus, an annular pattern air flow path 35 is formed for flowing the pattern forming air flowing in from the opening 32A to the pattern air port 34 of the air cap 4.
[0024]
Further, the flange portion 12B has an atomizing air hole 36 through which air for atomizing and discharging the coating material flows in front of the flange portion 12B on the back surface on the radially inner peripheral side with respect to the main body seal portion 13. The atomizing air holes 36 are composed of a plurality of (six in this example) small holes arranged at substantially equal intervals in the circumferential direction, and pass through the flange portion 12B in the front-rear direction so that the air flow path 22 The atomizing air that flows in through the opening 32 </ b> B and the second circumferential groove 28 </ b> B is supplied to the air nozzle port 6 of the air cap 4.
[0025]
The nozzle tip 11 is fixed to be exchangeable through a lock nut 14 screwed onto the nozzle body 8.
[0026]
The nozzle tip 11 has the nozzle hole 10 and a flange-shaped outer flange portion 11A that is in contact with the front end surface of the nozzle body 8 via a packing member 30B in this example on the outer periphery thereof. Yes.
[0027]
The nozzle hole 10 has a tapered cone-shaped valve seat 10B connected to the center hole 9 of the nozzle body 8 via a joint 10A in this example, and a small diameter paint nozzle provided at the front end of the valve seat 10B. It has a mouth 5. The valve seat 10B opens and closes the nozzle hole 10 by making contact with and separating from the needle valve 37 of the gun body 2. The needle valve 37 has a well-known structure and operates in synchronization with the air valve 24 by one pulling operation of the trigger 23.
[0028]
The nozzle tip 11 has a small-diameter nozzle portion 11C that is open to the paint nozzle port 5 through a tapered cone-shaped constriction portion 11B on the front end side of the outer flange portion 11A. A fitting tube portion 11D extends from the rear end side of the portion 11A. The fitting cylinder portion 11D can be fitted with an inner circumferential surface of a circumferential groove-like fitting groove portion 9A formed in a stepped shape at the front end of the central hole 9, and thereby the central hole 9D. And the nozzle hole 10 can be aligned concentrically with high accuracy. That is, the fitting cylinder portion 11D and the fitting groove portion 9A constitute a fitting portion 15 that aligns the nozzle tip 11 and the nozzle body 8 concentrically by fitting. The formation of the fitting groove portion 9A is also preferable in order to reduce the difference in inner diameter between the joint portion 10A and the center hole 9 and smooth the paint flow.
[0029]
The lock nut 14 is engaged with the front surface of the outer flange portion 11A by projecting inward in the radial direction at the front end of a cylindrical nut portion 14A having an inner screw screwed to the fixing portion 12C of the nozzle body 8. A mating inner flange portion 14B is provided. The nozzle tip 11 can be fixed to the nozzle body 8 in a replaceable manner by pressing the front surface of the outer flange portion 11A by screwing to the fixing portion 12C. In this example, the case where the rear end of the fitting tube portion 11D is positioned in the longitudinal direction by contacting the bottom surface of the fitting groove portion 9A at the time of the screwing is illustrated, but the front end surface of the fixing portion 12C is illustrated. The outer flange portion 11A may be held at a narrow pressure between the inner flange portion 14B and the inner flange portion 14B. At this time, the packing member 30B is made of synthetic resin such as Teflon or nylon.
[0030]
As described above, since the nozzle tip 11 can be replaced, the nozzle tip 11 can be formed of a material different from that of the nozzle body 8, for example, an abrasion-resistant material, and the wear life can be improved. Also, when the nozzle tip 11 is worn, it can be dealt with by replacing only the nozzle tip 11 and it is economically advantageous that the nozzle body 8 can be used as it is. As the wear-resistant material, cemented carbide, ceramic, and a surface treatment material having a surface subjected to a hardening treatment such as a nitriding method or a carburizing method can be appropriately employed.
[0031]
In addition, the nozzle tip 11 and the nozzle body 8 can be connected efficiently and simply while securing excellent concentricity by mutual fitting by the fitting portion 15. Thus, the occurrence of bending, deformation, etc., occurring when fixing by adhesion, press-fitting, or the like is eliminated, and a high-precision and high-quality paint nozzle fitting can be provided with high yield and low cost.
[0032]
Further, as the nozzle tip 11, a soft material subjected to a softening process such as plastic, rubber, and soft nitriding can be adopted. In such a case, the stopping property of the paint by the needle valve 37 can be improved. The paint workability when using the paint can be improved. The wear resistant material and the soft material include a material having a higher wear resistance and a soft material as compared with the nozzle body 8.
[0033]
It is also possible to replace the nozzle tip 11 in order to change only the diameter of the paint nozzle port 5 and adjust, for example, changes in the paint discharge amount and paint thickness due to the paint viscosity.
[0034]
Next, the air cap 4 is detachably attached to the gun body 2 via a lock nut 40 having substantially the same configuration as the lock nut 14. The air cap 4 has a well-known structure, and has a recess 17 on the back surface that houses and covers the paint nozzle fitting 3. Moreover, as for this dent part 1, the peripheral part 17A contact | abuts the said 3rd collar part B1 front surface. As a result, a first air reservoir 18A is formed on the radially inner side of the peripheral edge portion 17A and surrounded by the recess 17 and the coating material nozzle fitting 3, and on the radially outer side of the peripheral edge portion 17A, the front end surface of the gun body 2 is formed. And a second air reservoir 18B that is surrounded by the inner peripheral surface of the lock nut 40 and the back surface of the air cap 4 is formed.
[0035]
The air cap 4 is provided with an annular air nozzle port 6 surrounding the tip of the nozzle tip 11 and auxiliary holes 38 arranged on both sides of the air nozzle port 6 on the front surface. The pattern air ports 34 are formed inward in a pair of corner portions 39 that protrude radially outward from the hole 38 and forward.
[0036]
Here, the pattern air port 34 is electrically connected to the pattern air flow path 35 via the second air reservoir 18B. The air nozzle port 6 and the auxiliary hole 38 are electrically connected to the atomizing air hole 36 through the first air reservoir 18A. At this time, the atomizing air hole 36 is preferably opened toward the back surface of the lock nut 14. The reason is that the air from the atomizing air hole 36 can make the air in the air reservoir 18A uniform, for example, once hitting the lock nut 14 and agitating, so that the atomization of the paint can be stabilized.
[0037]
The lock nut 40 has an inner flange portion that engages with the front surface of the outer flange portion 4A provided on the outer periphery of the air cap 4 at the front end of a cylindrical nut portion 40A that is screwed to the front end portion 2B of the gun body 2. 40B, and the air cap 4 is exchangeably fixed by pressing the outer flange portion 4A by the screwing.
[0038]
As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.
[0039]
【The invention's effect】
As described above, according to the present invention, since the nozzle tip having the paint nozzle port is fixed to the nozzle body in a replaceable manner, the nozzle tip can be formed of a material different from that of the nozzle body, for example, an abrasion resistant material. And the wear life can be improved. Even when the nozzle tip is worn, it is only necessary to replace the nozzle tip, and the nozzle body can be used as it is, which is economically advantageous.
[0040]
Moreover, a soft material can also be adopted as the nozzle tip, and in such a case, the stopping property of the paint by the needle valve can be improved. For example, the paint workability when using a low-viscosity paint can be improved.
[0041]
In addition, since it is possible to eliminate the occurrence of bending and deformation that occurred when fixing by brazing, bonding, press-fitting, etc., as in the past, high-precision, high-quality paint nozzle fittings are provided with high yield and low cost. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of an air play gun using a paint nozzle fitting of the present invention.
FIG. 2 is an enlarged cross-sectional view showing the main part.
FIG. 3 is an exploded perspective view of a paint nozzle fitting.
FIG. 4 is a schematic cross-sectional view for explaining the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air spray gun 2 Gun body 3 Paint nozzle metal fitting 5 Paint nozzle port 9 Center hole 8 Nozzle body 10 Nozzle hole 10B Valve seat 11 Nozzle tip 11A Outer flange part 12B Hook part 13 Main body seal part 14 Lock nut 15 Fitting part 27 Paint Flow path 30B Packing member 35 Pattern air flow path 36 Atomizing air hole 37 Needle valve

Claims (5)

エアスプレーガンのガン本体に取付けられかつ前端の塗料ノズル口から吐出される塗料がガン本体からの空気により霧化噴出するエアスプレーガン用の塗料ノズル金具であって、
ガン本体に取り換え可能に固定されかつガン本体の塗料流路に連通する中心孔を有するノズル本体と、前記中心孔に通じかつガン本体の針弁の接離により開閉される弁座の前端に前記塗料ノズル口を設けたノズル孔を有するノズルチップとからなり、
前記ノズル本体は、前端側外周にガン本体との間をシールする鍔部を形成しかつ該鍔部の前端側に外ネジを有する固定部が突出した管状の基部を具え、
前記ノズルチップは、外周に外フランジ部を有し、前記ノズル本体の前記固定部に螺着するロックナットにより外フランジ部の前面をノズル本体に向けて押圧することによってノズルチップを、前記ノズル本体に交換可能に固定することを特徴とするエアスプレーガン用の塗料ノズル金具。A paint nozzle fitting for an air spray gun that is attached to the gun body of the air spray gun and sprayed from the paint nozzle port at the front end is atomized and ejected by air from the gun body,
A nozzle body having a center hole that is removably fixed to the gun body and communicates with a paint flow path of the gun body, and a front end of a valve seat that is connected to and separated from the center hole and is opened and closed by a needle valve of the gun body. It consists of a nozzle tip having a nozzle hole provided with a paint nozzle port,
The nozzle body includes a tubular base part that forms a flange part that seals between the gun body on the outer periphery on the front end side, and a fixing part that has an external screw protrudes on the front end side of the flange part,
The nozzle tip has an outer flange portion on an outer periphery, and the nozzle tip is pressed by pressing a front surface of the outer flange portion toward the nozzle body by a lock nut screwed to the fixing portion of the nozzle body. This is a paint nozzle fitting for an air spray gun, which is fixed to be replaceable. 前記ノズルチップは、前記外フランジ部と前記ノズル本体との間にパッキン部材を介在することを特徴とする請求項１記載のエアスプレーガン用の塗料ノズル金具。The paint nozzle fitting for an air spray gun according to claim 1 , wherein the nozzle tip has a packing member interposed between the outer flange portion and the nozzle body. 前記ノズルチップは、耐摩耗性材料からなることを特徴とする請求項１又は２に記載のエアスプレーガン用の塗料ノズル金具。The paint nozzle fitting for an air spray gun according to claim 1 or 2 , wherein the nozzle tip is made of a wear-resistant material. 前記ノズルチップとノズル本体とは、嵌合することによって同心に位置合わせされる嵌合部を有することを特徴とする請求項１〜３のいずれかに記載のエアスプレーガン用の塗料ノズル金具。The paint nozzle fitting for an air spray gun according to any one of claims 1 to 3 , wherein the nozzle tip and the nozzle body have a fitting portion that is concentrically aligned by fitting. 請求項１〜４のいずれかに記載のエアスプレーガン用の塗料ノズル金具を具えてなるエアスプレーガン。An air spray gun comprising the paint nozzle fitting for an air spray gun according to any one of claims 1 to 4 .
JP2001307851A 2001-10-03 2001-10-03 Paint nozzle fitting for air spray gun and air spray gun using the same Expired - Fee Related JP3737731B2 (en)

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