JP4364516B2 - Boss fixing mechanism for pump impeller - Google Patents

Boss fixing mechanism for pump impeller Download PDF

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Publication number
JP4364516B2
JP4364516B2 JP2003008341A JP2003008341A JP4364516B2 JP 4364516 B2 JP4364516 B2 JP 4364516B2 JP 2003008341 A JP2003008341 A JP 2003008341A JP 2003008341 A JP2003008341 A JP 2003008341A JP 4364516 B2 JP4364516 B2 JP 4364516B2
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JP
Japan
Prior art keywords
screw
hole
impeller
bolt
diameter
Prior art date
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Expired - Lifetime
Application number
JP2003008341A
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Japanese (ja)
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JP2004218572A (en
Inventor
隆浩 松原
秀典 鶴田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsurumi Manufacturing Co Ltd
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Tsurumi Manufacturing Co Ltd
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Filing date
Publication date
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Priority to JP2003008341A priority Critical patent/JP4364516B2/en
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Description

【０００１】
【発明の技術分野】
本発明は、ポンプ用羽根車におけるボス部の固定機構に関するものである。
【０００２】
【従来の技術】
羽根車ボス部の中心孔をポンプ軸に嵌合させ、環状介装体を介して角頭ボルトをポンプ軸のネジ孔に螺装させ、環状介装体と羽根車ボス部を連係ピンにより連係させ、中央の角孔を角頭ボルトに嵌合させて環状介装体に重合させたロックプレートをセットボルトで締着させるという、ポンプ用羽根車におけるボス部の固定機構は公知である（特許文献１参照）。また、ポンプ羽根車を対象としたものではないが、深く穿設されたネジ孔の深部に角穴付きネジ杆を螺入しておき、貫通穴付き角頭ボルトを上記ネジ杆の後方から螺入させ、角頭ボルトの貫通穴からアレンキーを挿し込んでその先端をネジ杆の角穴に係合させ、該アレンキーの回動操作によりネジ杆の前端面を角頭ボルトの後端面へ圧接させて弛み止め効果を得ようとする固定機構も公知である（特許文献２参照）。
【０００３】
【特許文献１】
特開２０００−１９２８９５号公報 （第１図）
【特許文献２】
特開平８−４２５４４号公報 （第２−３図）
【０００４】
【発明が解決しょうとする課題】
特許文献１記載のものは、弛み止め効果は大きいが、構造が複雑で位置合せが瞬速に行われず、取付作業に時間が掛かるという欠点がある。また、特許文献２記載のものは、構造的な複雑さはないが操作はやや煩雑で、ネジ杆と角頭ボルトの圧接が強力に作用し難く、これをポンプ羽根車の固定用として実施した場合には、羽根車ボス部の介在によりボルト頭からネジ杆までの距離が図示よりも更に長くなり、長いアレンキーによってネジ孔深部のネジ杆を操作しなければならず、アレンキーの捻り強度も低下し、ネジ杆と角頭ボルトの圧接作用が不十分となることは避けられない。
【０００５】
本発明の目的は、構造が簡潔で取付作業が迅速且つ容易に行われ、ローコストで、しかも弛み止め効果の大きい、ポンプ用羽根車におけるボス部の固定機構を提供することにある。
【０００６】
【問題を解決するための手段】
本発明に係るポンプ用羽根車におけるボス部の固定機構では、羽根車ボス部の前端面から穿設された大径有底孔の孔底部中心より羽根車ボス部の後端面へかけて小径貫通孔を穿設し、上記大径有底孔の内周面にはネジ栓の雄ネジと螺合する雌ネジを刻設し、頭付ボルトを小径貫通孔より挿通してポンプ軸の前端面から縦設されたポンプ軸の回転方向に対して締付け方向のネジ孔へ螺挿することにより羽根車をポンプ軸に定着させ、且つ、上記大径有底孔に上記頭付ボルトと同一方向ネジのネジ栓を螺装してその後端面を頭付ボルトのボルト頭へ圧接させ、ポンプの回転によってダブルナット作用を生じさせて強固な固定をさせるポンプ用羽根車におけるボス部の固定機構を提供する。
【０００７】
【実施例】
以下図１及び図２の実施例により説明をする。
【０００８】
１は羽根車ボス部、２は羽根車ボス部１の前端面から穿設された大径有底孔であり、内周面には雌ネジが刻設されている。３は大径有底孔２の孔底部中心より羽根車ボス部１の後端面へかけて穿設された小径貫通孔、４はポンプ軸、５はポンプ軸４の前端面から縦設された該ポンプ軸４の回転方向に対して締付け方向のネジ孔、６はネジ孔５と螺合する雄ネジの刻設された頭付ボルトであり、レンチ等螺回工具の係入に供するため、例えばボルト頭の中心に角孔を穿設し、或いはボルト頭の外周面を多角形に形成する。
【０００９】
７は大径有底孔２の雌ネジと螺合する雄ネジを外周面に刻設した該頭付ボルト６と同一方向ネジのネジ栓であり、レンチ等螺回工具の係入に供するため、例えば前端面中心に角孔を設け、或いは外周面の前端部付近を多角形に形成しておくものとする。
【００１０】
羽根車ボス部１の小径貫通孔３をポンプ軸４のネジ孔５に合致させ、頭付ボルト６を小径貫通孔３より挿通してネジ孔５へ螺装することにより羽根車をポンプ軸４に定着させ、且つ、ネジ栓７を大径有底孔２に螺装して、その後端面を頭付ボルト６のボルト頭へ圧接させれば、頭付ボルト６のボルト頭に、それよりも大きな螺旋サイズのネジ栓７のねじ込みトルクによって強固なダブルナット作用を生じることになる。
【００１１】
【発明の効果】
本発明ポンプ用羽根車におけるボス部の固定機構によれば、構造が簡潔で取付作業が迅速且つ容易に行われ、ローコストで比較的小さな頭付ボルト６を用いても、それよりも大きなサイズのネジ栓７のねじ込みトルクにより、ポンプの回転によってダブルナット作用を生じさせて強固な固定をさせる、ポンプ用羽根車におけるボス部の固定機構として、強力な弛み止め効果が得られるという利点がある。
【図面の簡単な説明】
【図１】 本発明機構による羽根車定着手順を示した要部縦断側面図であって、ネジ栓未螺装の状態である。
【図２】 本発明機構による羽根車定着手順を示した要部縦断側面図であって、ネジ栓螺装後の状態である。
【符号の説明】
１ 羽根車ボス部
２ 大径有底孔
３ 小径貫通孔
４ ポンプ軸
５ ネジ孔
６ 頭付ボルト
７ ネジ栓[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fixing mechanism for a boss portion in a pump impeller.
[0002]
[Prior art]
The center hole of the impeller boss part is fitted to the pump shaft, the square head bolt is screwed into the screw hole of the pump shaft through the annular interposer, and the annular interposer and the impeller boss part are linked by the linkage pin. A fixing mechanism for a boss portion in a pump impeller is known in which a central square hole is fitted to a square head bolt, and a lock plate that is superposed on an annular interposed body is fastened with a set bolt (patent) Reference 1). Although not intended for a pump impeller, a screw hole with a square hole is screwed into a deep portion of a deeply drilled screw hole, and a square head bolt with a through hole is screwed from behind the screw hole. Insert the Allen key from the through hole of the square head bolt, engage the tip of the Allen key with the square hole of the screw 杆, and press the front end surface of the screw へ to the rear end surface of the square head bolt by rotating the Allen key. In addition, a fixing mechanism for obtaining a loosening prevention effect is also known (see Patent Document 2).
[0003]
[Patent Document 1]
JP 2000-192895 (FIG. 1)
[Patent Document 2]
JP-A-8-42544 (Fig. 2-3)
[0004]
[Problems to be solved by the invention]
Although the thing of patent document 1 has a big anti-loosening effect, there exists a fault that a structure is complicated and alignment is not performed instantaneously and attachment work takes time. Moreover, although the thing of patent document 2 does not have structural complexity, operation is a little complicated, and the press contact of a screw rod and a square head bolt does not act strongly, and this was implemented for the fixing of a pump impeller. In this case, the distance from the bolt head to the screw rod becomes longer than shown in the figure due to the intervening impeller boss, and the screw rod in the deep part of the screw hole must be operated with a long Allen key, and the twist strength of the Allen key is also reduced. However, it is inevitable that the pressure contact action between the screw rod and the square head bolt is insufficient.
[0005]
An object of the present invention is to provide a fixing mechanism for a boss portion in a pump impeller that has a simple structure, can be mounted quickly and easily, is low-cost, and has a large anti-loosening effect.
[0006]
[Means for solving problems]
In the boss portion fixing mechanism in the pump impeller according to the present invention, the small-diameter penetrating from the center of the bottom of the large-diameter bottomed hole drilled from the front end surface of the impeller boss portion to the rear end surface of the impeller boss portion. A hole is drilled, and a female screw that engages with the male screw of the screw cap is engraved on the inner peripheral surface of the large-diameter bottomed hole, and a head bolt is inserted through the small-diameter through hole to allow the front end surface of the pump shaft The impeller is fixed to the pump shaft by being screwed into the screw hole in the tightening direction with respect to the rotation direction of the pump shaft provided vertically, and the screw having the same direction as the headed bolt is fixed to the large-diameter bottomed hole. The boss part fixing mechanism in the pump impeller is provided in which a screw cap is screwed and the rear end face is pressed against the bolt head of the headed bolt, and a double nut action is generated by rotation of the pump to provide a strong fixing. The
[0007]
【Example】
This will be described below with reference to the embodiment shown in FIGS.
[0008]
Reference numeral 1 denotes an impeller boss portion, and 2 denotes a large-diameter bottomed hole drilled from the front end surface of the impeller boss portion 1, and a female screw is engraved on the inner peripheral surface. 3 is a small-diameter through hole drilled from the center of the bottom of the large-diameter bottomed hole 2 to the rear end surface of the impeller boss 1, 4 is a pump shaft, and 5 is vertically provided from the front end surface of the pump shaft 4. The screw hole 6 in the tightening direction with respect to the rotation direction of the pump shaft 4 is a headed bolt engraved with a male screw that is screwed into the screw hole 5, and is used for engaging a screw tool such as a wrench. For example, a square hole is formed in the center of the bolt head, or the outer peripheral surface of the bolt head is formed in a polygon.
[0009]
Reference numeral 7 denotes a screw plug having a screw in the same direction as the headed bolt 6 in which a male screw screwed with a female screw of the large-diameter bottomed hole 2 is engraved on the outer peripheral surface, and is used for engaging a screw tool such as a wrench. For example, a square hole is provided at the center of the front end surface, or the vicinity of the front end portion of the outer peripheral surface is formed in a polygon.
[00 10 ]
The small diameter through hole 3 of the impeller boss 1 is matched with the screw hole 5 of the pump shaft 4, and the head bolt 6 is inserted through the small diameter through hole 3 and screwed into the screw hole 5, so that the impeller is connected to the pump shaft 4. If the screw cap 7 is screwed into the large-diameter bottomed hole 2 and the rear end face is pressed against the bolt head of the head bolt 6, the bolt head of the head bolt 6 is more A strong double nut action is generated by the screwing torque of the screw plug 7 having a large spiral size.
[001 1 ]
【The invention's effect】
According to the boss fixing mechanism in the pump impeller of the present invention, the structure is simple and the mounting operation is performed quickly and easily. Even if a relatively small head bolt 6 is used at a low cost, a larger size than that is used. As a fixing mechanism of the boss portion in the impeller for the pump, which has a double nut action by the rotation of the pump and is firmly fixed by the screwing torque of the screw plug 7, there is an advantage that a strong loosening prevention effect can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a main part showing an impeller fixing procedure by a mechanism of the present invention, in a state where a screw cap is not screwed.
FIG. 2 is a longitudinal sectional side view showing a main part of the impeller fixing procedure according to the mechanism of the present invention, after screw screwing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Impeller boss | hub part 2 Large diameter bottomed hole 3 Small diameter through-hole 4 Pump shaft 5 Screw hole 6 Head bolt 7 Screw cap

Claims (1)

羽根車ボス部の前端面から穿設された大径有底孔の孔底部中心より羽根車ボス部の後端面へかけて小径貫通孔を穿設し、上記大径有底孔の内周面にはネジ栓の雄ネジと螺合する雌ネジを刻設し、頭付ボルトを小径貫通孔より挿通してポンプ軸の前端面から縦設されたポンプ軸の回転方向に対して締付け方向のネジ孔へ螺挿することにより羽根車をポンプ軸に定着させ、且つ、上記大径有底孔に上記頭付ボルトと同一方向ネジのネジ栓を螺装してその後端面を頭付ボルトのボルト頭へ圧接させ、ポンプの回転によってダブルナット作用を生じさせて強固な固定をさせることを特徴とする、ポンプ用羽根車におけるボス部の固定機構。A small-diameter through hole is drilled from the center of the bottom of the large-diameter bottomed hole drilled from the front end surface of the impeller boss portion to the rear end surface of the impeller boss portion, and the inner peripheral surface of the large-diameter bottomed hole Is engraved with a female screw that engages with the male screw of the screw cap, and the head bolt is inserted through the small-diameter through-hole and tightened with respect to the rotational direction of the pump shaft installed vertically from the front end surface of the pump shaft. The impeller is fixed to the pump shaft by screwing it into the screw hole, and the screw cap of the screw in the same direction as the headed bolt is screwed into the large-diameter bottomed hole, and the rear end surface thereof is a bolt of the headed bolt. A fixing mechanism for a boss portion in a pump impeller, which is brought into pressure contact with a head and causes a double nut action by rotation of the pump to be firmly fixed.
JP2003008341A 2003-01-16 2003-01-16 Boss fixing mechanism for pump impeller Expired - Lifetime JP4364516B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003008341A JP4364516B2 (en) 2003-01-16 2003-01-16 Boss fixing mechanism for pump impeller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003008341A JP4364516B2 (en) 2003-01-16 2003-01-16 Boss fixing mechanism for pump impeller

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JP4364516B2 true JP4364516B2 (en) 2009-11-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102330704A (en) * 2011-07-11 2012-01-25 江苏秋林重工股份有限公司 Impeller base

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5589889B2 (en) * 2011-02-21 2014-09-17 株式会社Ｉｈｉ Turbo machine
DE102013208476A1 (en) * 2013-05-08 2014-11-13 Ksb Aktiengesellschaft pump assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102330704A (en) * 2011-07-11 2012-01-25 江苏秋林重工股份有限公司 Impeller base

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