JPH0547328Y2

JPH0547328Y2 -

Info

Publication number: JPH0547328Y2
Application number: JP1987175526U
Authority: JP
Priority date: 1987-11-17
Filing date: 1987-11-17
Publication date: 1993-12-13
Anticipated expiration: 2002-11-17
Also published as: JPH0178773U

Description

[Detailed explanation of the idea] [Field of application of idea]

本考案は、食品用の粉砕機、粉体輸送装置、噴
霧乾燥装置、送風機など、食品粉体取扱装置にお
ける外付け型回転軸のシール構造に関する。 The present invention relates to a seal structure for an external rotary shaft in a food powder handling device such as a food crusher, powder transport device, spray dryer, or blower.

[Conventional technology and its problems]

（背景）今日行われている、外付け型回転軸のシール構
造は基本的に第３図のようなもので、ケーシング
（例えばブロワ）の器壁１から伸びる円筒状鍔付
パツキン箱２内に数本のグランドパツキン３，３
…を挿入した上、同じく鍔付のパツキン押さえ４
を挿入し、両者の鍔部２ａ，４ａをボルト５で固
定する方法を採つている（実教出版株式会社刊
「図説機械用語辞典1953」92頁参照）。この場合、グランドパツキン３は器壁１と回転
軸５間の隙間Ｃから入り込む粉体との摩擦により
発熱すると同時に次第に摩耗するから、定期的に
取り外して新品と交換する。この摩擦による摩耗
は、ケーシング内の取扱物が粉体である場合は当
然激しくなり、現に本考案者が第３図の軸封装置
をオカラ粉砕機、食品用噴霧乾燥機等に使用した
体験によつても、該パツキン交換後、数日以内に
洩れが発生し、この現象をパツキン数の増加によ
り阻止するのは事実上不可能であつた。しかも取
扱対象物が食品の粉末である場合（粉体輸送装
置、噴霧乾燥装置等）、該粉末が概して熱に不安
定であるため、摩擦によるグランドパツキンの温
度上昇が対象食品粉末の品質を低下させること
は、パツキンの交換の手数以上の、より重要な問
題である。（従来技術の問題点）従来、鉱石粉砕機などのローラーミルにおい
て、回転ケーシング、即ちローラー壁面に複雑な
凹凸を設けると共に、器壁内の固定軸面に対向す
る凸凹リングを取り付けてラビリンスを形成さ
せ、固定軸内の空気通路を介して該ラビリンス内
へ加圧空気を吹き込むようにした装置が開発され
ている（実公昭62−8689号公報参照）。しかしこ
の方法を回転軸の軸封用に利用するときは、回転
軸中へ通気する必要があるため、空気入り口と回
転軸面とのシールに面倒な機構を必要とするのみ
でなく、ラビリンス加工も工作的に極めて面倒で
ある。 (Background) The seal structure of external rotary shafts used today is basically as shown in Figure 3, in which a cylindrical flanged seal box 2 extending from the wall 1 of a casing (for example, a blower) is installed. Several Grand Patsukin 3,3
After inserting ..., the packing presser 4 with the same flange
is inserted, and the flanges 2a, 4a are fixed with bolts 5 (see "Illustrated Machine Terminology Dictionary 1953" published by Jikkyo Publishing Co., Ltd., p. 92). In this case, the gland packing 3 generates heat due to friction with the powder that enters from the gap C between the vessel wall 1 and the rotating shaft 5, and at the same time gradually wears out, so it must be periodically removed and replaced with a new one. The wear caused by this friction naturally becomes severe when the object handled in the casing is powder, and the present inventor actually used the shaft sealing device shown in Figure 3 in an okara crusher, a food spray dryer, etc. Even so, leakage occurred within a few days after the gasket was replaced, and it was virtually impossible to prevent this phenomenon by increasing the number of gaskets. Moreover, when the object to be handled is food powder (powder transportation equipment, spray drying equipment, etc.), the powder is generally unstable to heat, so the temperature rise of the gland packing due to friction will reduce the quality of the food powder. This is a more important issue than the hassle of replacing the gaskets. (Problems with the prior art) Conventionally, in a roller mill such as an ore crusher, a rotating casing, that is, a roller wall surface is provided with complex irregularities, and a labyrinth is formed by attaching a convex-concave ring facing a fixed shaft surface in the vessel wall. A device has been developed in which pressurized air is blown into the labyrinth through an air passage in a fixed shaft (see Japanese Utility Model Publication No. 8689/1989). However, when this method is used for shaft sealing of a rotating shaft, it is necessary to ventilate the rotating shaft, which not only requires a complicated mechanism to seal the air inlet and the rotating shaft surface, but also requires labyrinth processing. It is also extremely difficult to construct.

[Purpose of invention]

以上の現状に鑑み、本考案は、回転軸を備える
粉体食品取扱装置において、従来の外付け型軸封
装置に対し僅かの工作を加えるだけで、実質的に
粉体洩れを阻止することができ、しかも耐久性に
優れた粉体食品取扱用軸封装置を提供することを
目的とする。 In view of the above-mentioned current situation, the present invention has been proposed to substantially prevent powder leakage in powder food handling equipment equipped with a rotating shaft by adding a slight modification to the conventional external shaft sealing device. An object of the present invention is to provide a shaft sealing device for handling powdered food which is capable of handling powdered food and has excellent durability.

[Means to achieve the purpose]

（概要）本考案は、上記目的を達成するため、回転装置
を囲むケーシングの外壁に固定された筒状の鍔付
パツキング箱と、該箱内を該箱の軸心方向に沿つ
て貫通する回転軸の周囲に施された環状のグラン
ドパツキンと、前記回転軸の外周面とパツキング
箱との間に位置し、かつその内周壁と前記回転軸
の外周面との間にクリヤランスを有する円筒状の
鍔付パツキン押さえとを有する外付け型軸封装置
において、該装置は、前記パツキン押さえに連結
され、かつそれを軸方向に沿つて貫通する送気管
と前記クリヤランスの外端面を気密的に外界と遮
断するシール材とを含み、送気管内へ圧入された
気体が、上記クリヤランスを経て上記グランドパ
ツキンに衝突し、該パツキンを冷却させると同時
に上記ケーシング内からパツキン箱内へ迷入する
粉体に対し封止作用を営むようにしたことを特徴
とする食品粉体取扱用回転機器における回転軸の
シール装置を要旨とする。以下、考案の詳細につ
いて説明する。（構造）本案装置におけるパツキン箱及びパツキン押さ
えの構造は、基本的に従来のものと類似である
が、本案装置においては、パツキン箱内を気密化
する必要があるのでパツキン押さえのフランジ側
開口部内周に例えば弗素ゴム等の低摩擦性弾性材
料で作られたガスケツトが施される。このガスケ
ツトは、好ましくは例えば《オイルシート》等と
呼ばれる、コ字状断面を有し、内圧により拡開し
てシール効果を高める形式のものが好ましい。上のフランジ押さえは、更にそのスリーブ部に
穿設された気体導入孔（貫通孔）を有し、外部の
圧力源と接続するための継手が付加される。因
に、ブロワ等の粉体取扱装置の内部におけるゲー
ジ圧は精々0.1Kg／cm²以下であるから、本継手は
簡単な構造でよく、例えば該スリーブ部に直接埋
め込まれた銅又は黄銅パイプでもよい。（グランドパツキン）本考案によれば、極端にはグランドパツキンを
全廃することも可能であるが、前記ガスケツトへ
の負荷を減じるため、少数のグランドパツキンは
併用した方がよい。本パツキンの材料としては、
麻、アスベスト、フアイバー、皮革などが利用さ
れるが、成るべくグラフアイト、二硫化モリブデ
ン又は二硫化タングステン等による減摩処理を施
されたものが望ましい。 (Summary) In order to achieve the above object, the present invention includes a cylindrical packing box with a flange fixed to the outer wall of a casing surrounding a rotating device, and a rotating packing box that passes through the inside of the box along the axial direction of the box. an annular gland packing provided around the shaft; and a cylindrical gland packing located between the outer circumferential surface of the rotating shaft and the packing box and having a clearance between the inner circumferential wall and the outer circumferential surface of the rotating shaft. In an external type shaft sealing device having a flanged packing holder, the device airtightly connects an air pipe connected to the packing holder and passing through it in the axial direction and an outer end surface of the clearance from the outside world. The gas that is pressurized into the air supply pipe passes through the clearance, collides with the gland packing, cools the packing, and at the same time prevents powder from entering the packing box from inside the casing. The gist of the present invention is a sealing device for a rotating shaft in a rotating device for handling food powder, which is characterized by having a sealing effect. The details of the idea will be explained below. (Structure) The structure of the packing box and packing holder in the proposed device is basically similar to the conventional one, but in the proposed device, since it is necessary to make the inside of the packing box airtight, the inside of the opening on the flange side of the packing holder is A gasket made of a low-friction, elastic material, such as fluororubber, is provided around the periphery. This gasket is preferably of a type called an "oil sheet" or the like, which has a U-shaped cross section and expands under internal pressure to enhance the sealing effect. The upper flange retainer further has a gas introduction hole (through hole) bored in its sleeve portion, and a joint for connecting to an external pressure source is added. Incidentally, since the gauge pressure inside a powder handling device such as a blower is at most 0.1 Kg/cm ² or less, this joint may have a simple structure, such as a copper or brass pipe directly embedded in the sleeve. good. (Gland Packing) According to the present invention, it is possible to completely eliminate the gland packing, but in order to reduce the load on the gasket, it is better to use a small number of gland packing together. The materials for this packing include:
Hemp, asbestos, fiber, leather, etc. can be used, but it is preferable to use materials that have been subjected to antifriction treatment with graphite, molybdenum disulfide, tungsten disulfide, or the like.

[Effect]

本考案におけるシール装置の構造は非常に簡単
であつて、普通の外付け型軸封装置に多少の工作
を施すだけで、食品粉体取扱装置用回転機器に対
し効果的な粉体シールを施すことができる。しか
もパツキン押さえと回転軸との間のクリヤランス
へ通気された加圧空気は、グランドパツキンへ衝
突してその摩擦熱を奪うから、単なる粉体シール
に留まらず、食品の加熱を抑制するのに有効であ
る。このため、蛋白質のような熱に弱い物質でも
摩擦熱の影響を受け難い。なお、粉体が外部へ漏
出する恐れがないため、清掃の手数が不要となり
職場環境が改善される。 The structure of the sealing device of the present invention is very simple, and it can provide effective powder sealing for rotating equipment used in food powder handling equipment by simply making some modifications to an ordinary external shaft sealing device. be able to. Moreover, the pressurized air vented to the clearance between the packing holder and the rotating shaft collides with the gland packing and takes away its frictional heat, so it is effective not only for sealing powder but also for suppressing food heating. It is. Therefore, even heat-sensitive substances such as proteins are not easily affected by frictional heat. Furthermore, since there is no risk of powder leaking to the outside, there is no need for cleaning and the work environment is improved.

【Example】

第１図は、本案装置の一例のパツキン押さえ側
から見た一部切欠平面図、第２図は、第１図、線
Ｘ−Ｘに沿う断面図である。（構造）全体は、スリーブ状の鍔付パツキン箱２と、該
箱の内壁に対し密に嵌挿されうる鍔付グランド押
さえ４と、該グランド押さえの鍔４ａ側入口部内
周に刻設された環状の溝６と、同じくグランド押
さえ４のスリーブ部４ｂに穿たれた貫通孔７とを
主要な構成として構成され、前記溝６内には断面
コ字状のガスケツト（オイルシール）８がバネ９
により密に装着され、また上記貫通孔７には、そ
の内壁に刻まれた捻子溝１０を介して管継手１１
が螺着されている。そして0.5Kg／cm²程度の低圧
空気がパイプ１２を介して回転軸Ｓとグランド押
さえ４のスリーブ部４ｂ内壁との間のクリヤラン
ス１３内へ送り込まれる。なお、該グランド押さ
え４の奥側には、三枚のグランドパツキン３が耐
負荷用に挿入されており、全体はボルト５，５…
により固定されている。（動作）パイプ１２より継手１１を介してクリヤランス
１３内へ圧入された空気Ａは、第２図矢印の向き
に進んで軸Ｓと器壁１との隙間ｃからケーシング
内へ吹き出すので、粉体取扱装置側からパツキン
箱２内への塵埃Ｄの侵入が実質的に阻止される。
このため、少数枚数のグランドパツキン３だけで
粉塵の漏出が長期に亙り完全に阻止される。因
に、オカラ粉砕機のブロワ軸に装置された本例の
装置は、設置後４月以上に亙り、一切の粉塵漏出
なしに経過している。 FIG. 1 is a partially cutaway plan view of an example of the device according to the present invention, seen from the packing presser side, and FIG. 2 is a sectional view taken along line XX in FIG. 1. (Structure) The overall structure consists of a sleeve-shaped flange-equipped packing box 2, a flange-equipped gland holder 4 that can be tightly fitted into the inner wall of the box, and a flange carved on the inner periphery of the entrance on the side of the flange 4a of the gland holder. It is mainly composed of an annular groove 6 and a through hole 7 bored in the sleeve portion 4b of the gland retainer 4. Inside the groove 6, a gasket (oil seal) 8 having a U-shaped cross section is inserted into a spring 9.
The pipe joint 11 is installed in the through hole 7 through a screw groove 10 carved in the inner wall of the through hole 7.
is screwed on. Then, low pressure air of about 0.5 kg/cm ² is sent through the pipe 12 into the clearance 13 between the rotating shaft S and the inner wall of the sleeve portion 4b of the gland holder 4. In addition, three gland packings 3 are inserted into the back side of the gland retainer 4 for load-bearing purposes, and the entire structure is made up of bolts 5, 5...
Fixed by (Operation) Air A, which is forced into the clearance 13 from the pipe 12 via the joint 11, advances in the direction of the arrow in Fig. 2 and blows out into the casing from the gap c between the shaft S and the vessel wall 1, so that the powder Intrusion of dust D into the packing box 2 from the handling device side is substantially prevented.
Therefore, leakage of dust can be completely prevented for a long period of time with only a small number of gland packings 3. Incidentally, the device of this example installed on the blower shaft of the Okara crusher has been installed for more than four months without any dust leaking.

[Effect of the idea]

以上説明した通り、本考案は、粉末食品取扱用
回転機器の外付け型軸封装置として、粉体シール
のため効果的な軸封装置を提供する。特に、本案
シール装置は、グランドパツキンに対する冷却手
段を兼ねているので、取扱食品粉体の品質を低下
させることがなく、しかも普通の粉体用軸封装置
を僅かに加工するだけで製作できるので、保守管
理の省力化、公害防止及び労働衛生の向上等に多
大の寄与を果たしうる。 As explained above, the present invention provides an effective shaft sealing device for powder sealing as an external shaft sealing device for a rotary machine for handling powdered foods. In particular, the proposed sealing device also serves as a cooling means for the gland packing, so it does not reduce the quality of the food powder handled, and it can be manufactured with a small amount of processing on a normal powder shaft sealing device. , can make a significant contribution to saving labor in maintenance management, preventing pollution, and improving occupational health.

[Brief explanation of the drawing]

第１図は、本案装置の一例のパツキン押さえ側
から見た一部切欠平面図、第２図は、第１図、線
Ｘ−Ｘに沿う断面図、第３図は、公知の回転軸シ
ール構造の概略を示す図である。図中の符号の意
味は以下の通り：１……粉体取扱回転装置のケーシング；２……
１のパツキン箱；２ａ……２の鍔部、１３……２
内のクリヤランス；３……２内のグランドパツキ
ン；４……パツキン押さえ；４ａ……４の鍔部、
４ｂ……４のスリーブ部；６……４ａの溝、７…
…４ｂの貫通孔；８……６内のオイルシール；９
……８内のスプリング；１０……７内の捻子溝、
１１……管継手、１２……送気パイプ；５……固
定用ボルト；Ｓ……公知例の回転軸；ｃ……１−
Ｓ間のクリヤランス、Ａ……空気、Ｄ……粉塵。 Fig. 1 is a partially cutaway plan view of an example of the device according to the present invention, as seen from the packing presser side, Fig. 2 is a sectional view taken along line XX in Fig. 1, and Fig. 3 is a known rotary shaft seal. It is a figure showing an outline of a structure. The meanings of the symbols in the diagram are as follows: 1... Casing of powder handling rotating device; 2...
1 packing box; 2a...2 collar part, 13...2
Clearance inside; 3...Ground packing inside 2; 4...Packaging holder; 4a...flange of 4;
4b...sleeve part of 4; 6...groove of 4a, 7...
...Through hole in 4b; 8...Oil seal in 6; 9
...Spring in 8; 10...Twist groove in 7,
11... Pipe joint, 12... Air supply pipe; 5... Fixing bolt; S... Rotating shaft of known example; c... 1-
Clearance between S, A...Air, D...Dust.

Claims

[Claims for Utility Model Registration] 1. A packing box with a cylindrical flange fixed to the outer wall of a casing surrounding a rotating device, and a packing box fitted around a rotating shaft passing through the box along the axial direction of the box. a cylindrical flanged packing retainer located between the outer circumferential surface of the rotating shaft and the packing box and having a clearance between the inner circumferential wall thereof and the outer circumferential surface of the rotating shaft; The external shaft sealing device has an air supply pipe connected to the packing retainer and passing through it in the axial direction, and a sealing material that airtightly isolates the outer end surface of the clearance from the outside world. The gas that is pressurized into the air pipe contains
For handling food powder, characterized in that it collides with the gland packing after passing through the clearance, cools the packing, and at the same time acts as a seal against the powder that strays from inside the casing into the packing box. Sealing device for rotating shafts in rotating equipment. 2. The sealing device according to claim 1, wherein the sealing material is a gasket having a U-shaped cross section and incorporating a spring for expansion.