經濟部智慧財產局員工消費合作社印製 44〇483 Α7 __ Β7 五、發明說明（) 發明領域Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 44〇483 Α7 __ Β7 V. Description of Invention () Field of Invention
本發明係有關一種電漿銲覆槍’尤其係有關一種用於 電衆銲覆槍之喷嘴結構及其製法。另外，本發明亦有 關一種具有該喷嘴結構之電漿銲覆槍D 先前技藝說明 電聚銲覆（Plasma Transferretl Arc Welding，簡稱 ρ τ a )製 程，是一應用電漿熱源和粉末材料的表面銲覆堆積方 法’具有低稀釋率、自動化容易、材料適用性高和具 經濟效益等諸多有利特性。電源機、銲槍、送粉器和 冰水機疋電漿銲覆係統的基本配備。現有商業化電聚 銲覆設計都是使用單一送粉器，並以—或二條粉末輸 送孔與銲槍連結，將粉末輸送到錦槍，經銲槍嘴嘴出 粉孔進入熔池’而在工件表面形成被覆層。 銲搶之結構可區分為兩大部份’ 一為電漿電派構成之 中心本體，另一部份則是構成保護氣與粉末輸送通路 之外圍部。噴嘴是上述中心本體之一部份，安置於中 心本體的最前端。如圖1所示，噴嘴結構丨具有供電漿 電派產生之中心孔1 1和冷卻噴嘴之冷卻水流道1 2 ^有 些噴嘴設計也包括粉末輸送孔1 3。喷嘴—般是使用純 銅材質加工製作。 目前已知之銲槍噴嘴皆以機械加工方式製作。由於冷 卻水流道1 2並非垂直下降溝槽，且底部寬度一般不及 2 m m ’習知技藝受限於加工技術，其冷卻水流道丨2之 O:\60\60702.DOC — 4 - 界A诋尺度適用中國國家標準（CNS)A4規格（21〇 χ 297公釐） I ------------ I 裝---—丨 ---訂_!|丨--- (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印*'衣 440483 五、發明說明（2 ) 底部與端面14之距離L1 一般在8〜11mm °此種一體成 形之嘴嘴結構在較高電流、有預熱操作條件下，易因 噴嘴端面溫度過高而發生粉末沾附喷嘴端面’進而有 垂滴現象或粉末流道孔被阻塞情況發生’使鮮覆作業 必須被迫中斷進行清理工作’也常因此使銲層品質出 狀況。上述缺失在銲覆熔點相對較低的鎳基合金時’ 尤其容易發生。 習知技藝為克服粉末孔阻塞之問題’曾提出不少解決 方式。例如日本三菱材料（Mitsubishi Materials Corp.)之JP 8001340A公開申請案’發明名稱為「Welding T〇rch and Build up Welding Equipment Provided therewith」，提出一種改良之粉 末孔結構；以及JP 7246476A公開申請案，發明名稱為 「Welding Torch of Build up Welding Eguipment」，提出一種在粉 末供應通道中裝設開啟/閉合裝置以期能快速消除粉 末累積之裝置。類似此種抑制粉末孔阻塞或改良粉末 孔及通道結構之設計亦可參見美國專利第US 4866240 號，「Nozzle for Plasma Torch and Method for Introducing Powder into the Plasma Plume of a Plasma Torch」，以及日本大同鋼鐵公司 JP 8300158A及JP 8300159A號公開申請案中《 然而上述之技藝係著重於解決粉末孔阻塞之問題，以 改善熔填效率，但由於銲槍冷卻能力無法有效提昇， 亦限制高電流、高堆積速率之電漿銲覆系統的發展。 故有需要設計一種新穎且富進步性之電漿銲覆槍噴嘴 結構及其製造方法，以解決上述之問題。 O:\60\60702DOC 一 5 — 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之汶意事項再填寫本頁) %--------訂-------1 —線· 44 04 8 3 A7 _ B7 五、發明說明（3 ) 發明概述 本案發明人發現在本技藝中，由於熱傳遞速率和正向 溫度梯度成正比’因此減少電漿銲覆槍中冷卻水流道 與噴嘴端面之間的壁厚可提昇正向溫度梯度，進而大 幅改善噴嘴之冷卻效果，使粉末孔阻塞問題得以進一 步改善。 本發明之一目的在於提供一種用於電漿鮮覆槍之喷嘴 結構’其係由獨立元件之第一元件與第二元件密接而 成’並施加以硬銲填料密封组合接缝，克服機械加工 之限制’使噴嘴之冷卻水流道更接近其端面，以強化 冷卻水對嗔嘴端面之冷卻效果。 在本發明之一實施例中’噴嘴冷卻水流道與噴嘴端面 距離由傳統之8-llmm縮減至3-5mm，加速將喷嘴所 吸收之熱量帶走’以避免噴嘴端面溫度持續昇高。 在進一步之實施例中’噴嘴端面被加以研磨拋光，藉 以減少對銲覆熔池和工件輻射熱的吸收。The present invention relates to a plasma welding coating gun ', and more particularly, to a nozzle structure and a method for manufacturing the same. In addition, the present invention also relates to a plasma welding torch D having the nozzle structure. The prior art explains the process of Plasma Transferretl Arc Welding (referred to as ρ τ a), which is a surface welding using a plasma heat source and a powder material. The overlay method has many favorable characteristics such as low dilution rate, easy automation, high material applicability, and economic benefits. Basic equipment of power supply machine, welding gun, powder feeder and ice water machine / plasma welding system. Existing commercial polycondensation welding cover designs use a single powder feeder and are connected to the welding gun with—or two powder conveying holes—to convey the powder to the brocade gun and enter the molten pool through the powder outlet hole of the welding gun mouth to the workpiece surface Form a coating layer. The structure of the welding grab can be divided into two parts. One is the central body composed of plasma and electricity, and the other is the outer part that forms the protective gas and powder conveying path. The nozzle is a part of the above-mentioned center body and is arranged at the forefront of the center body. As shown in Fig. 1, the nozzle structure has a central hole 11 generated by the power supply and a cooling water flow channel 1 2 of the cooling nozzle. Some nozzle designs also include powder delivery holes 13. Nozzles—usually made from pure copper. Currently known welding torch nozzles are made by machining. Since the cooling water flow channel 12 is not a vertical descending groove, and the width of the bottom is generally less than 2 mm. The conventional technique is limited by processing technology. Its cooling water flow channel 2 O: \ 60 \ 60702.DOC — 4-界 A The standard is applicable to China National Standard (CNS) A4 (21〇χ 297mm) I ------------ I equipment ----- 丨 --- order_! | 丨 --- ( Please read the precautions on the back before filling in this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs * 'clothing 440483 V. Description of the invention (2) The distance L1 between the bottom and the end face 14 is generally 8 ~ 11mm Under the conditions of high current and preheating operation, the nozzle structure is prone to powder adhesion to the nozzle end surface due to the high temperature of the nozzle end surface, and then a dripping phenomenon or a blockage of the powder flow channel occurs. Forced to interrupt the cleaning work 'often also caused the quality of the solder layer to be out of condition. The above-mentioned defect is particularly likely to occur when the nickel-based alloy having a relatively low melting point is welded. The conventional technique has proposed many solutions to overcome the problem of blockage of powder pores. For example, Mitsubishi Materials Corp.'s JP 8001340A published application 'invention name is "Welding Torch and Build up Welding Equipment Provided therewith", which proposes an improved powder pore structure; and JP 7246476A published application, invention Named "Welding Torch of Build up Welding Eguipment", a device was proposed to install an opening / closing device in the powder supply channel in order to quickly eliminate the accumulation of powder. Similar designs to suppress the blocking of powder pores or improve the structure of powder pores and channels can also refer to U.S. Patent No. 4,866,240, "Nozzle for Plasma Torch and Method for Introducing Powder into the Plasma Plume of a Plasma Torch", and Datong Steel of Japan In the company's public applications No. JP 8300158A and JP 8300159A, "However, the above-mentioned technique focuses on solving the problem of blockage of powder holes to improve the filling efficiency. However, because the welding gun cooling capacity cannot be effectively improved, it also limits the high current and high accumulation rate. Development of Plasma Welding System. Therefore, there is a need to design a novel and progressive plasma welding gun nozzle structure and its manufacturing method to solve the above problems. O: \ 60 \ 60702DOC One 5 — This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (please read the matter on the back before filling this page)% ------- -Order ------- 1 —line · 44 04 8 3 A7 _ B7 V. Description of the invention (3) Summary of the invention The inventor of this case found that in this technique, since the heat transfer rate is directly proportional to the forward temperature gradient ', therefore Reducing the wall thickness between the cooling water flow channel and the nozzle end face in the plasma welding gun can increase the forward temperature gradient, thereby greatly improving the cooling effect of the nozzle, and further improving the problem of powder hole blocking. One object of the present invention is to provide a nozzle structure for a plasma fresh coating gun, which is formed by tightly bonding a first element and a second element of independent elements, and applying a brazed filler to seal a combined seam to overcome mechanical processing. The "limitation" makes the cooling water flow path of the nozzle closer to its end face to enhance the cooling effect of the cooling water on the end face of the nozzle. In one embodiment of the present invention, the distance between the nozzle cooling water flow channel and the nozzle end face is reduced from the conventional 8-11mm to 3-5mm, and the heat absorbed by the nozzle is accelerated away to prevent the nozzle endface temperature from continuously increasing. In a further embodiment, the 'nozzle end face is ground and polished to reduce the absorption of radiant heat from the weld pool and the workpiece.
本發明之另一目的在於提供一種製造該噴嘴結構之方 法，以及一種使用該噴嘴結構之電漿銲覆槍D 本發明之優點在於強化冷卻水對噴嘴端面之冷卻效 果’以使喷嘴能在高電流及高熔填速率、或工件預熱 溫度較高之條件下作業’避免因噴嘴端面溫度過高致 使粉末在其表面沾附’進而發生出粉孔阻塞使銲覆作 業無法持續之現象。 O:\60\60702.DOC _ ^ _ 本紙诋尺度遇用中國國家標準（CNS)A4規格（210 x 297公釐） ii {請先閱讀背面之注意事項再填寫本頁) JHe 丁 經濟部智慧財產局員工消費合作社印製 A7 f 440483 _B7 五、發明說明（4 ) 圖示簡述 ' 圖1為習知電漿銲覆槍之噴嘴結構之縱向剖面示意 圖； 圖2 a為報據本發明較佳實施例之噴嘴結構結合前之 縱向剖面示意圖； 圖2 b為本發明較佳實施例之喷嘴結構結合後之縱向 剖面示意圖； 圖3 a為本發明具有倒角部之第二元件之縱向剖面示 固 · 思圖， 圖3 b為本發明具有倒角部之噴嘴結構結合後之縱向 剖面示意圖； 圖4為本發明之噴嘴結構之立體剖面構造示意圖。 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製Another object of the present invention is to provide a method for manufacturing the nozzle structure, and a plasma welding coating gun D using the nozzle structure. The advantage of the present invention is to strengthen the cooling effect of the cooling water on the nozzle end face so that the nozzle can Working under the conditions of high current and high melting rate, or high pre-heating temperature of the workpiece, 'to avoid the powder from adhering to the surface due to the high temperature of the nozzle end surface', and the phenomenon that the outlet holes are blocked and the welding operation cannot be continued. O: \ 60 \ 60702.DOC _ ^ _ The size of this paper meets the Chinese National Standard (CNS) A4 specification (210 x 297 mm) ii {Please read the precautions on the back before filling this page) JHe Ding Ministry of Economic Affairs Wisdom A7 f 440483 _B7 printed by the Property Cooperative Consumers Co., Ltd. 5. Description of the invention (4) Brief description of the diagram 'Figure 1 is a schematic longitudinal sectional view of the nozzle structure of a conventional plasma welding coating gun; Figure 2a Figure 2b is a schematic longitudinal sectional view of the nozzle structure before the combination of the preferred embodiment; Figure 2b is a schematic longitudinal sectional view of the nozzle structure after the combination of the preferred embodiment of the present invention; Figure 3a is a longitudinal section of the second component with a chamfered portion of the present invention Fig. 3b is a schematic longitudinal sectional view of a nozzle structure with a chamfered portion according to the present invention, and Fig. 4 is a schematic perspective sectional structure view of the nozzle structure of the present invention. (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs
1 ： 習知噴嘴結構 11 :中心孔 1 2 :冷卻水流道 13 :粉末輸送孔 14 :端面 L 1 :冷卻水流道至 2 ： 噴嘴結構 2 1 :第一元件 2 1 1 :第一外壁 Q:\60\60702.DOC 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 經濟部智慧財產局員工消費合作社印製 4 4 〇4 8 3 A7 _________ B7 五、發明說明（5 ) 2 1 2 :第二外壁 22 :第二元件 22 1 :端面 222 :内壁 2 2 3 :中央開口 224 :粉末輸送孔 2 2 5 :倒角部 226 :溝槽 L 2 :冷卻水流道至端面之距離 發明詳述 根據本發明之用於電漿銲覆槍之噴嘴結構2如圖2 a及 2b所示。用於電漿銲覆槍之噴嘴結構2包括一第—元件 21及一第二元件22。第一元件21具有一第一外壁211 與一第一外壁212 ’第二外壁212於第一外壁211之 上’第一元件21略呈上寬下窄之狀，第一元件21之中 心孔道用以傳輸電衆氣體’並與鶴棒電極構成電聚電 弧。 第二元件22，略呈碗型’具有一端面221、—内壁 222及一中央開口 223，其中該端面221設置於第二元 件22之底部，中央開口 2U設置於該第二元件22之中 央，並由該内壁222之中央軸向貫穿至端面221，中央 開口 2 2 3恰可容納第·一元件2 1之第一外壁2 U，並與第 —外壁211密接（如圖2b所示），使第二元件22之内 O:\60\60702OQC - 8 — 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） I-------------^.---]**1—訂----1!·"^ (請先閱讀背面之;i意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 44 04 8 3 A7 B7 五、發明說明（6 ) 壁222與第一 7L件21之第二外壁212共同界定出一環繞 該第一元件2 1之空間，用以做為冷卻水之流道3 因為本發明之第一元件21與第二元件22為獨立分離 之元件，故而可對第一元件2 1及第二元件2 2分別加 工；其主要係對第一元件21之第二外壁212及第二元 件22之内壁222進行加工’使得第二元件22之内壁 222至面221之距離L 2能盡量縮短，以致於第一元件 21及第二元件22密接後’冷卻水流道能盡量接近端面 2 2 1。在一較佳貫施例中’ L 2之距離約為5 m m ’更佳 者為3 m m。 因此’利用本發明之喷嘴結構2可加強冷卻水對端面 2 2 1之冷卻效果’以使噴嘴2能在高電流及高熔填速 率、或工件預熱溫度較高之條件下作業，避免因喷嘴2 之端面221溫度過高致使粉末在其表面沾附，進而發生 出粉孔阻塞使銲覆作業無法持續之現象。 第二元件22另包括複數個粉末輸送孔224，分別由第 二元件22之外緣斜向貫穿至第二元件22之端面221。 在加工第二元件22之内壁222或粉末輸送孔224時，必 須注意不可使第二元件22之内壁222與粉末輸送孔224 相通。在此限制條件下，第二元件2 2之内壁2 2 2可被 加工以盡量縮短L 2之距離。 如圖3a所示，第二元件22在内壁222之底部靠近中 央開口223與第一元件21密合處設有一倒角部225。當 第一元件21與第二元件22密合後，倒角部225與第一 O:\6O\6ff702.DOC — 9 — 本紙張尺度ϋ中國國家標準（CNS)A4規格（210 X 297公爱^ ^ ------------- 裝 -----訂---- -----線 ' - (請先閲讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 44 〇4 8 3 A7 _ B7 五、發明說明（7 ) 元件21s第二外壁212共同界定出一環繞第一元件21 之溝槽2 2 6 (如圖3 b所示），可用以填充硬鮮材料， 例如銀基合金’使第一元件2 1與第二元件2 2能進一步 地緊密結合以避免冷却水洩漏。.另外，第二元件之端 面2 2 1可予以研磨拋光’以減少輻射熱之吸收，進而減 少粉末之沾附。 圖4所示為本發明噴嘴結構之立體剖面圖，可更清楚 地闡明溝槽2 2 6、冷卻水流道及距離L 2之相關位置。 本發明製造噴嘴結構2之方法，包括以下步驟： (a) 製作一第一元件21，使該第一元件21具有一第 一外壁211與一第二外壁212，第二外壁212位 於第一外壁211之上； (b) 製作一第二元件22，該第二元件22略呈碗 型，具有一端面221、一内壁222及一中央開 口 223，其中該端面221設置於該第二元件22 之底部，該中央開口 223設置於該第二元件 22之中央，並由該内壁222之中央軸向貫穿 至端面221，該中央開口 223恰可容納該第— 元件2 I之第一外壁2 1 1 ;以及 (c) 以同軸方式密接第二元件22之中央開口 223與第 一元件21之第一外壁211，使該第二元件22之 内壁222與第一元件21之第二外壁212共同界定 出一環繞該第一元件之空間，用以做為冷卻水之 流道。 O:\60V607O2DOC - 1 〇 - 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） ------------裝i i.-----訂--------線' „ (請先閱讀背面之注意事項再填寫本頁) ^40483 A7 B7 五、發明說明（8 ) 經濟部智慧財產局員工消費合作社印製 由於本發明i製造方法為分別加工兩獨立分離元件並 再丁以組合，故可對第一元件2丨及第二元件2 2分別加 工，其中第一元件21之第二外壁212被加工，使第二 外壁212略呈上寬下窄之狀；另.外加工該第二元件22 之内壁222，使該内壁222之底部接近端面221，因 此，第二元件22之内壁222至端面221之距離L2能盡 量縮短，克服了習知技術中一體成形之喷嘴結構，其 加工不易，而致使冷卻水流道無法靠近端面之缺點。 另外，本發明之製造方法’可先加工製作第一元件 21，使其為中空之腔體；或先將第一元件21與第二元 件22密接後，再加工為中空之腔體，並且，粉末輸送 孔224亦可在組合前加工製造，或在组合後再加工製 成，相當具有製造上之彈性。 為使第一元件21與第二元件22間進一步地緊密結 合’第一元件在内壁222之底部靠近中央開口 223與第 一元件21舍合處形成有一倒角部225。當第一元件21 與第二元件2 2密合後’可用以填充硬銲材料，例如銀 基合金，以避免冷却水洩漏。另外，為減少輻射熱之 吸收’可將第二元件之端面221予以研磨拋光。 本發明亦包括具有上述喷嘴結構之電漿銲覆槍，該電 漿銲覆槍具有上述之結構特徵，因此，該電衆鮮覆槍 月色廣泛應用於局電流及南溶填速率、或工件預熱溫度 較高之條件下作業。 唯上述實施例僅為例示性說明本發明之原理及其功1: Conventional nozzle structure 11: Center hole 1 2: Cooling water flow channel 13: Powder conveying hole 14: End face L 1: Cooling water flow channel to 2: Nozzle structure 2 1: First element 2 1 1: First outer wall Q: \ 60 \ 60702.DOC This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 4 〇 4 8 3 A7 _________ B7 V. Description of the invention (5 ) 2 1 2: second outer wall 22: second element 22 1: end surface 222: inner wall 2 2 3: central opening 224: powder conveying hole 2 2 5: chamfered portion 226: groove L 2: cooling water flow path to the end surface Detailed description of the distance invention The nozzle structure 2 for a plasma welding gun according to the present invention is shown in Figs. 2a and 2b. The nozzle structure 2 for a plasma welding gun includes a first element 21 and a second element 22. The first element 21 has a first outer wall 211 and a first outer wall 212. The second outer wall 212 is above the first outer wall 211. The first element 21 is slightly wider and narrower. In order to transmit electric gas, it forms an electric arc with the crane rod electrode. The second element 22 is slightly bowl-shaped, and has an end surface 221, an inner wall 222, and a central opening 223. The end surface 221 is provided at the bottom of the second element 22, and the central opening 2U is provided at the center of the second element 22. And the central opening of the inner wall 222 axially penetrates to the end surface 221, and the central opening 2 2 3 can just accommodate the first outer wall 2 U of the first element 21 and is in close contact with the first-outer wall 211 (as shown in FIG. 2b). Within the second element 22 O: \ 60 \ 60702OQC-8 — This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) I ------------- ^ .---] ** 1—Order ---- 1! · &Quot; ^ (Please read the back of the page; I will fill in this page before filling in this page) Printed by the Intellectual Property Bureau Employee Consumer Cooperatives 44 04 8 3 A7 B7 V. Description of the invention (6) The wall 222 and the second outer wall 212 of the first 7L member 21 together define a space surrounding the first element 21 for the cooling water flow channel 3 One element 21 and the second element 22 are independent and separate elements, so the first element 21 and the second element 22 can be processed separately; it is mainly for the second outer wall 212 of the first element 21 and The inner wall 222 of the second element 22 is processed so that the distance L 2 between the inner wall 222 of the second element 22 and the surface 221 can be shortened as much as possible, so that the cooling water flow path can be as close to the end surface as possible after the first element 21 and the second element 22 are in close contact. 2 2 1. In a preferred embodiment, the distance of 'L 2 is approximately 5 m m', and more preferably 3 m m. Therefore, 'the use of the nozzle structure 2 of the present invention can enhance the cooling effect of the cooling water on the end surface 2 2 1' to enable the nozzle 2 to operate under conditions of high current and high melt filling rate or high preheating temperature of the workpiece, avoiding The temperature of the end surface 221 of the nozzle 2 is too high, which causes the powder to adhere to its surface, and the powder outlet holes are blocked, which makes the welding operation unsustainable. The second element 22 further includes a plurality of powder conveying holes 224, which pass through the outer edge of the second element 22 obliquely to the end surface 221 of the second element 22, respectively. When processing the inner wall 222 or powder conveying hole 224 of the second element 22, care must be taken not to make the inner wall 222 of the second element 22 communicate with the powder conveying hole 224. Under this restriction, the inner wall 2 2 2 of the second element 22 can be machined to minimize the distance L 2. As shown in FIG. 3a, the second element 22 is provided with a chamfered portion 225 at the bottom of the inner wall 222 near the central opening 223 and in close contact with the first element 21. When the first element 21 and the second element 22 are in close contact, the chamfered portion 225 and the first O: \ 6O \ 6ff702.DOC — 9 — This paper size ϋ Chinese National Standard (CNS) A4 specification (210 X 297 public love ^ ^ ------------- Install ----- Order ---- ----- Line '-(Please read the precautions on the back before filling this page) Ministry of Economy Wisdom Printed by the Consumer Cooperative of the Property Bureau 44 〇 4 8 3 A7 _ B7 V. Description of the invention (7) The second outer wall 212 of the element 21s together defines a groove 2 2 6 surrounding the first element 21 (as shown in Figure 3b) ), Can be used to fill hard and fresh materials, such as silver-based alloys, so that the first element 21 and the second element 22 can be further tightly combined to avoid cooling water leakage. In addition, the end face 2 2 of the second element can be Grinding and polishing 'to reduce the absorption of radiant heat and thus reduce the adhesion of powder. Figure 4 shows a three-dimensional sectional view of the nozzle structure of the present invention, which can more clearly clarify the correlation between the groove 2 2 6, the cooling water flow path and the distance L 2 The method of manufacturing the nozzle structure 2 according to the present invention includes the following steps: (a) Fabricating a first element 21 so that the first element 21 has a first outer wall 211 And a second outer wall 212, the second outer wall 212 is located on the first outer wall 211; (b) making a second element 22, which is slightly bowl-shaped, has an end surface 221, an inner wall 222, and a center An opening 223, wherein the end surface 221 is disposed at the bottom of the second element 22, the central opening 223 is disposed at the center of the second element 22, and axially penetrates from the center of the inner wall 222 to the end surface 221. The first outer wall 2 1 1 of the first element 2 I can be accommodated; and (c) the central opening 223 of the second element 22 and the first outer wall 211 of the first element 21 are tightly coaxially connected, so that the second element 22 The inner wall 222 and the second outer wall 212 of the first element 21 together define a space surrounding the first element for use as a cooling water flow channel. O: \ 60V607O2DOC-1 〇- This paper standard applies to Chinese national standards ( CNS) A4 size (210 X 297 mm) ------------ install i i .----- order -------- line '„(Please read the Note for this page, please fill in this page) ^ 40483 A7 B7 V. Description of the invention (8) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The method is to separately process two independent separated elements and then combine them, so the first element 2 and the second element 22 can be processed separately. The second outer wall 212 of the first element 21 is processed to make the second outer wall 212 slightly. The upper part is narrower than the upper part. In addition, the inner wall 222 of the second element 22 is processed outside so that the bottom of the inner wall 222 is close to the end surface 221. Therefore, the distance L2 from the inner wall 222 to the end surface 221 of the second element 22 can be shortened as much as possible. It overcomes the shortcomings of the integrally formed nozzle structure in the conventional technology, which is not easy to process, and the cooling water channel cannot be close to the end face. In addition, in the manufacturing method of the present invention, the first element 21 can be processed and made into a hollow cavity first; or the first element 21 and the second element 22 can be tightly sealed before being processed into a hollow cavity, and, The powder conveying hole 224 can also be processed and manufactured before assembly, or processed after assembly, which is quite flexible in manufacturing. In order to further tightly bond the first element 21 and the second element 22, a chamfered portion 225 is formed at the bottom of the inner wall 222 near the central opening 223 and the first element 21. When the first element 21 and the second element 22 are in close contact, they can be used to fill a brazing material, such as a silver-based alloy, to avoid leakage of cooling water. In addition, in order to reduce the absorption of radiant heat ', the end surface 221 of the second element may be ground and polished. The invention also includes a plasma welding coating gun with the above nozzle structure. The plasma welding coating gun has the above-mentioned structural features. Therefore, the moonlight coating gun is widely used in local current and south filling rate, or workpieces. Work under high preheating temperature. The above embodiments are only for illustrative purposes to explain the principles and functions of the present invention.
O:\60\60702DOC -11 - 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公芨） -----.--------^ —— (請先閱讀背面之注意事項再填寫本頁) 訂· —線_ 44 〇4 s A7 _B7_五、發明說明（9 )效，而非限制本發明，因此，習於此技術之人士對上 述實施例所做之修改及變化仍不達背本發明之精神。 本發明之權限應如後述之申請專利範圍所界定。 I -------------^---^-----訂---------I, (請先闓讀背面之沒音？事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 O:\00\60702.DOC — 1 2 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）O: \ 60 \ 60702DOC -11-This paper size applies to China National Standard (CNS) A4 (210 x 297 cm) -----.-------- ^ —— (Please read the back first Please pay attention to this page before filling in this page) Order · —line _ 44 〇 4 s A7 _B7_ V. Description of the invention (9), rather than limiting the invention, therefore, those skilled in this technology will do what the above embodiment does Modifications and changes still fall short of the spirit of the present invention. The rights of the present invention should be defined by the scope of patent application mentioned later. I ------------- ^ --- ^ ----- Order --------- I, (Please read the no sound on the back first? Matters before filling in this Page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs O: \ 00 \ 60702.DOC — 1 2 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)