JP4135825B2

JP4135825B2 - Filter element

Info

Publication number: JP4135825B2
Application number: JP16336098A
Authority: JP
Inventors: 義彦原田
Original assignee: 日本濾過器株式会社
Priority date: 1998-06-11
Filing date: 1998-06-11
Publication date: 2008-08-20
Anticipated expiration: 2018-06-11
Also published as: JPH11347329A

Description

【０００１】
【発明の属する技術分野】
本発明は、フィルタエレメントに関する。
【０００２】
【従来の技術】
従来、濾過装置に内蔵されるフィルタエレメントとして、図３に示すようなフィルタエレメント５０がある。このフィルタエレメント５０は、多数の折り目５１，５２が蛇腹状に屈曲された帯状の濾材５３の両端を接合して円筒形状に形成され、その両端にはドーナツ形のエンドプレート（図示せず）が固定され、内周面には多数の孔を有する鋼板によって形成された筒（図示せず）が嵌合される。同じ大きさで濾過面積を増やすために、多数の折り目５１，５２を形成して折り目５１，５２の間の濾過面５４の面数をできるだけ多くし、これにより、流体に含まれた異物の捕捉効果を向上させるようにしている。この場合、外側の折り目５１の間隔よりも内周側の折り目５２の間隔が狭くなるので、濾過面５４の面数を多くするには限度がある。
【０００３】
このため、実公平２−９８５１号公報、実公平２−１５５４８号公報等に記載されているように、円筒形状の空間の内周側と外周側とで濾材の密度が大きく変化しないように折り方を改良したフィルタエレメントが種々提案されている。
【０００４】
図４に示す例も同様の視点から提案されたものである。すなわち、図４に示すフィルタエレメント５５は、内周側の折り目５２の間隔より外周側の折り目５１の間隔が広くなることに着目し、半径方向の長さが長い濾過面５４と短い濾過面５６とを交互に配列することにより、外周側の空間を短い濾過面５６で埋め、全体の濾過面積を広くするものである。このようなフィルタエレメント５５の折り方は、恰もＭなる文字を多数放射状に配列すような折り方で、Ｍ折りと称されている。
【０００５】
【発明が解決しようとする課題】
しかしながら、濾過面５４，５６の腰の強さは、半径方向の長さが短い方が必然的に強いため、短い方の濾過面５６が長い方の濾過面５４を押圧する。これにより、隣接する長い方の濾過面５４が密着し、この間に濾過すべき流体を通すことができなくなる。すなわち、濾材５３の全面を有効に利用することができなくなり、濾過面積が少なくなるおそれがある。
【０００６】
【課題を解決するための手段】
請求項１記載の発明は、シート状の濾材を多数の折り目をもって蛇腹状に屈曲することにより形成された多数の濾過面を有し、前記濾材の両端を接合してなる円筒体の両端をエンドプレートにより挾持したフィルタエレメントにおいて、前記濾過面は、前記円筒体の内径に略等しい半径の円周上と前記円筒体の外径に略等しい半径の円周上とで折曲された大濾過面と、この大濾過面の内周よりも大きな半径の円周上と前記円筒体の外径に略等しい半径の円周上とで屈曲された中濾過面と、この中濾過面の内周よりも大きな半径の円周上と前記円筒体の外径に略等しい半径の円周上とで屈曲された小濾過面とに分かれて設けられ、前記中濾過面と前記小濾過面とは、互いに連続された状態で所定の位置で隣接する前記大濾過面の間に配設されている。
【０００７】
したがって、隣接する大濾過面の間隔は内周側より外周側で広くなるが、隣接する大濾過面の間の空間の外周側には中濾過面と小濾過面とが配設されているため、濾過面積を広くすることが可能となる。また、半径方向の長さが最も短い小濾過面は腰の強さで開脚方向に広がろうとする作用を示すが、その開脚方向の圧力は二番目に腰の強い中濾過面の変形により吸収され、さらに、中濾過面は大濾過面よりも腰が強いためつぶれるほどのことがない。これにより、大中小の全ての濾過面同士が密着することがない。
【０００８】
また、請求項１記載の発明は、中濾過面と小濾過面とは隣接する大濾過面の間に一つずつ配設され、最短距離に配設された中濾過面同士の間及び小濾過面同士の間には二つの大濾過面が連続して配設されている。
【０００９】
したがって、全濾過面に対する大濾過面の面数の割合を多くすることが可能となり、濾過面積をさらに広くすることが可能となる。
【００１０】
【発明の実施の形態】
本発明の一実施の形態を図１及び図２に基づいて説明する。図１に示すように、フィルタエレメント１は、シート状の濾材２を多数の折り目３，４をもって蛇腹状に屈曲することにより形成された多数の濾過面５，６，７を有し、その濾材２の両端を接合してなる円筒体８の両端をエンドプレート（図示せず）により挾持した構成である。
【００１１】
本実施の形態では、濾過面は大濾過面５と中濾過面６と小濾過面７とに分けて設けられている。大濾過面５は、円筒体８の内径に略等しい半径Ｒ１の円周上と円筒体８の外径に略等しい半径Ｒ４の円周上とで折曲されているため半径方向の長さが最も長い。中濾過面６は、半径Ｒ１よりも大きな半径Ｒ２の円周上と半径Ｒ４の円周上とで屈曲されている。小濾過面７は、半径Ｒ２よりも大きな半径Ｒ３の円周上と半径Ｒ４の円周上とで屈曲されているため半径方向の長さが最も短い。
【００１２】
これら長さの異なる濾過面５，６，７を、外周に向けてＶ字形に開脚する形状をもって一つの単位でみれば、本実施の形態のフイルタエレメント１は、連続する二つの大濾過面５と一つの中濾過面６と一つの小濾過面７とを連続する一つのパターンＰを形成し、このパターンＰを複数パターン円周上に配列した構成である。
【００１３】
その一つのパターンＰを図２に示す。図２のパターンＰは円筒体８の半径に対して直交する方向に濾過面５，６，７を配列した状態で図示したので、濾過面５，６，７を図１のように円弧に沿って配列した状態と異なるが、大濾過面５の谷となる折り目３と山となる折り目４との間隔は最も大きいＷ１に定められ、中濾過面６の谷となる折り目３と山となる折り目４との間隔はＷ１より小さいＷ２に定められ、小濾過面７の谷となる折り目３と山となる折り目４との間隔は最も小さいＷ３に定められている。
【００１４】
このようなフィルタエレメント１は、濾過装置（図示せず）に組み込まれ、フィルタエレメント１の外側（又は内側）から内側（又は外側）に向けて流体を通すことにより、その流体に含まれる異物を捕捉する。
【００１５】
この場合、パターンＰ間で隣接する大濾過面５の間隔は内周側より外周側で広くなるが、その隣接する大濾過面５の間の外周側には中濾過面６と小濾過面７とが配設されているため、濾過面積を広くすることができる。また、半径方向の長さが最も短い小濾過面７は腰の強さで開脚方向に広がろうとする作用を示すが、その開脚方向の圧力は二番目に腰の強い中濾過面６の変形により吸収され、さらに、中濾過面６は大濾過面５よりも腰が強いためつぶれるほどのことがない。これにより、大中小の全ての濾過面５，６，７同士が密着することがない。したがって、流体に含まれる異物を効果的に捕捉することができる。
【００１６】
また、中濾過面６と小濾過面７とは、パターンＰ間で隣接する大濾過面５の間に一つずつ配設され、最短距離に配設された中濾過面６同士の間及び小濾過面７同士の間には複数（本実施の形態では二つ）の大濾過面５が連続して配設されている。換言すれば、二つの大濾過面５とそれぞれ一つ中濾過面６及び小濾過面７とにより一つのパターンＰを形成しているので、濾過面５，６，７の総面数に対する大濾過面５の面数の割合を多くすることができる。これにより、濾過面積をさらに広くすることができる。
【００１８】
【発明の効果】
請求項１記載の発明は、シート状の濾材を多数の折り目をもって蛇腹状に屈曲することにより形成された多数の濾過面を有し、前記濾材の両端を接合してなる円筒体の両端をエンドプレートにより挾持したフィルタエレメントにおいて、前記濾過面は、前記円筒体の内径に略等しい半径の円周上と前記円筒体の外径に略等しい半径の円周上とで折曲された大濾過面と、この大濾過面の内周よりも大きな半径の円周上と前記円筒体の外径に略等しい半径の円周上とで屈曲された中濾過面と、この中濾過面の内周よりも大きな半径の円周上と前記円筒体の外径に略等しい半径の円周上とで屈曲された小濾過面とに分かれて設けられ、前記中濾過面と前記小濾過面とは、互いに連続された状態で所定の位置で隣接する前記大濾過面の間に配設されているので、隣接する大濾過面の間隔は内周側より外周側で広くなるが、隣接する大濾過面の外周側には中濾過面と小濾過面とが配設されているため、濾過面積を広くすることができる。また、半径方向の長さが最も短い小濾過面は腰の強さで開脚方向に広がろうとする作用を示すが、その開脚方向の圧力を二番目に腰の強い中濾過面の変形により吸収することができ、さらに、中濾過面は大濾過面よりも腰が強いためつぶれるほどのことがない。これにより、大中小の全ての濾過面同士が密着することがなく、流体に含まれる異物を長期にわたり効果的に捕捉することができる。さらに、容積に対する濾過面積を広くすることができるため、従来と同等の濾過面積を求めるならばコンパクトなフィルタエレメントを提供することができる。
【００１９】
請求項１記載の発明は、また、中濾過面と小濾過面とは隣接する大濾過面の間に一つずつ配設され、最短距離に配設された中濾過面同士の間及び小濾過面同士の間には二つの大濾過面が連続して配設されているので、全濾過面に対する大濾過面の面数の割合を多くすることができ、これにより、濾過面積をさらに広くすることができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態におけるフィルタエレメントの濾材の屈曲状態を示す平面図である。
【図２】大濾過面と中濾過面と小濾過面との配列パターンを示す説明図である。
【図３】第一の従来例におけるフィルタエレメントの濾材の屈曲状態を示す平面図である。
【図４】第二の従来例におけるフィルタエレメントの濾材の屈曲状態を示す平面図である。
【符号の説明】
１フィルタエレメント
２濾材
３，４折り目
５大濾過面
６中濾過面
７小濾過面
８円筒体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filter element.
[0002]
[Prior art]
Conventionally, there is a filter element 50 as shown in FIG. The filter element 50 is formed in a cylindrical shape by joining both ends of a band-shaped filter medium 53 in which a large number of folds 51 and 52 are bent in a bellows shape, and donut-shaped end plates (not shown) are formed at both ends. The cylinder (not shown) formed by the steel plate which is fixed and has many holes is fitted by the inner peripheral surface. In order to increase the filtration area with the same size, a large number of folds 51, 52 are formed to increase the number of filtration surfaces 54 between the folds 51, 52 as much as possible, thereby capturing foreign substances contained in the fluid. I try to improve the effect. In this case, since the interval between the inner folds 52 is narrower than the interval between the outer folds 51, there is a limit to increasing the number of filtration surfaces 54.
[0003]
For this reason, as described in Japanese Utility Model Publication No. 2-9851, Japanese Utility Model Publication No. 2-15548, etc., it is folded so that the density of the filter medium does not change greatly between the inner peripheral side and the outer peripheral side of the cylindrical space. Various filter elements with improved methods have been proposed.
[0004]
The example shown in FIG. 4 is also proposed from the same viewpoint. That is, the filter element 55 shown in FIG. 4 pays attention to the fact that the interval between the outer folds 51 is wider than the interval between the inner folds 52, and the filtration surface 54 with a long radial direction and the short filtration surface 56. Are alternately arranged so that the space on the outer peripheral side is filled with a short filtration surface 56 and the entire filtration area is widened. Such a folding method of the filter element 55 is a folding method in which a large number of letters “M” are arranged radially, and is called “M folding”.
[0005]
[Problems to be solved by the invention]
However, the strength of the waists of the filtration surfaces 54 and 56 is inevitably stronger when the length in the radial direction is shorter, so the shorter filtration surface 56 presses the longer filtration surface 54. As a result, the adjacent longer filtration surfaces 54 are in close contact with each other, and the fluid to be filtered cannot be passed therebetween. In other words, the entire surface of the filter medium 53 cannot be effectively used, and the filtration area may be reduced.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 has a large number of filtration surfaces formed by bending a sheet-like filter medium into a bellows shape with a large number of folds, and ends both ends of a cylindrical body formed by joining both ends of the filter medium. In the filter element held by a plate, the filtration surface is a large filtration surface that is bent on a circumference having a radius substantially equal to the inner diameter of the cylindrical body and a circumference having a radius substantially equal to the outer diameter of the cylindrical body. An intermediate filtration surface bent on a circumference having a radius larger than the inner circumference of the large filtration surface and a circumference having a radius substantially equal to the outer diameter of the cylindrical body, and an inner circumference of the middle filtration surface Are divided into a small filtration surface bent on a circumference of a large radius and a circumference of a radius substantially equal to the outer diameter of the cylindrical body, and the medium filtration surface and the small filtration surface are mutually connected. It is arranged between the large filtration surfaces adjacent to each other at a predetermined position in a continuous state. That.
[0007]
Therefore, although the interval between adjacent large filtration surfaces is wider on the outer periphery side than the inner periphery side, the medium filtration surface and the small filtration surface are disposed on the outer periphery side of the space between the adjacent large filtration surfaces. The filtration area can be increased. The small filtration surface with the shortest length in the radial direction shows the action of spreading in the leg opening direction with the strength of the waist, but the pressure in the leg opening direction is the deformation of the medium filtration surface with the second strongest waist. In addition, the middle filtration surface is stronger than the large filtration surface, so it does not collapse. Thereby, all the large, medium and small filtration surfaces do not adhere to each other.
[0008]
In the first aspect of the present invention , the medium filtration surface and the small filtration surface are disposed one by one between the adjacent large filtration surfaces, and between the medium filtration surfaces disposed at the shortest distance and between the small filtration surfaces. Two large filtration surfaces are continuously arranged between the surfaces.
[0009]
Therefore, the ratio of the number of large filtration surfaces to the entire filtration surface can be increased, and the filtration area can be further increased.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the filter element 1 has a large number of filter surfaces 5, 6, and 7 formed by bending a sheet-shaped filter medium 2 into a bellows shape with a large number of folds 3 and 4, and the filter medium. In this configuration, both ends of a cylindrical body 8 formed by joining both ends of the two are held by end plates (not shown).
[0011]
In the present embodiment, the filtration surface is divided into a large filtration surface 5, an intermediate filtration surface 6, and a small filtration surface 7. Since the large filtration surface 5 is bent on the circumference of the radius R1 substantially equal to the inner diameter of the cylindrical body 8 and on the circumference of the radius R4 substantially equal to the outer diameter of the cylindrical body 8, the length in the radial direction is large. Longest. The middle filtration surface 6 is bent on the circumference of the radius R2 larger than the radius R1 and on the circumference of the radius R4. Since the small filtration surface 7 is bent on the circumference of the radius R3 larger than the radius R2, and on the circumference of the radius R4, the length in the radial direction is the shortest.
[0012]
If these filtration surfaces 5, 6, and 7 having different lengths are viewed in one unit with a V-shaped opening toward the outer periphery, the filter element 1 of the present embodiment has two continuous large filtration surfaces. 5, one medium filtration surface 6 and one small filtration surface 7 are formed as one continuous pattern P, and this pattern P is arranged on a plurality of pattern circles.
[0013]
One pattern P is shown in FIG. Since the pattern P in FIG. 2 is illustrated with the filtering surfaces 5, 6, and 7 arranged in a direction orthogonal to the radius of the cylindrical body 8, the filtering surfaces 5, 6, and 7 are arranged along an arc as shown in FIG. However, the distance between the crease 3 that becomes the valley of the large filtration surface 5 and the crease 4 that becomes the peak is determined to be the largest W1, and the crease 3 that becomes the valley of the middle filtration surface 6 and the crease that becomes the peak. 4 is determined to be W2, which is smaller than W1, and the interval between the crease 3 serving as a valley of the small filtration surface 7 and the crease 4 serving as a mountain is determined to be the smallest W3.
[0014]
Such a filter element 1 is incorporated in a filtration device (not shown), and allows a fluid to pass from the outside (or inside) of the filter element 1 toward the inside (or outside), thereby removing foreign substances contained in the fluid. To capture.
[0015]
In this case, the interval between the large filtration surfaces 5 adjacent to each other between the patterns P is wider on the outer periphery side than the inner periphery side, but the intermediate filtration surface 6 and the small filtration surface 7 are disposed on the outer periphery side between the adjacent large filtration surfaces 5. And the filtering area can be increased. In addition, the small filtration surface 7 having the shortest length in the radial direction exhibits an action of spreading in the leg opening direction due to the strength of the waist, and the pressure in the leg opening direction is the middle filtration surface 6 having the second strongest waist. Furthermore, since the middle filtration surface 6 is stronger than the large filtration surface 5, the middle filtration surface 6 is not collapsed. As a result, all the large, medium and small filtration surfaces 5, 6, and 7 do not adhere to each other. Therefore, the foreign substance contained in the fluid can be captured effectively.
[0016]
The medium filtration surface 6 and the small filtration surface 7 are arranged one by one between the large filtration surfaces 5 adjacent to each other between the patterns P, and between the medium filtration surfaces 6 arranged at the shortest distance and between the small filtration surfaces 5. A plurality (two in this embodiment) of large filtration surfaces 5 are continuously disposed between the filtration surfaces 7. In other words, since one pattern P is formed by the two large filtration surfaces 5 and one medium filtration surface 6 and one small filtration surface 7 respectively, the large filtration with respect to the total number of the filtration surfaces 5, 6, 7. The ratio of the number of surfaces 5 can be increased. Thereby, the filtration area can be further increased.
[0018]
【The invention's effect】
The invention according to claim 1 has a large number of filtration surfaces formed by bending a sheet-like filter medium into a bellows shape with a large number of folds, and ends both ends of a cylindrical body formed by joining both ends of the filter medium. In the filter element held by a plate, the filtration surface is a large filtration surface that is bent on a circumference having a radius substantially equal to the inner diameter of the cylindrical body and on a circumference having a radius substantially equal to the outer diameter of the cylindrical body. An intermediate filtration surface bent on a circumference having a radius larger than the inner circumference of the large filtration surface and a circumference having a radius substantially equal to the outer diameter of the cylindrical body, and an inner circumference of the middle filtration surface And a small filtration surface bent on a circumference of a large radius and a circumference of a radius substantially equal to the outer diameter of the cylindrical body, and the medium filtration surface and the small filtration surface are mutually connected It is arranged between the large filtration surfaces adjacent to each other at a predetermined position in a continuous state. Therefore, the interval between adjacent large filtration surfaces is wider on the outer periphery side than the inner periphery side, but the filtration area is increased because the intermediate filtration surface and the small filtration surface are disposed on the outer periphery side of the adjacent large filtration surface. Can be widened. The small filtration surface with the shortest length in the radial direction shows the action of spreading in the direction of the legs with the strength of the waist, but the pressure in the direction of the legs is the second deformation of the medium filtration surface with the strongest waist. Furthermore, since the middle filtration surface is stronger than the large filtration surface, it does not collapse so much. Thereby, all the large, medium and small filtration surfaces do not adhere to each other, and foreign substances contained in the fluid can be effectively captured over a long period of time. Furthermore, since the filtration area with respect to the volume can be widened, a compact filter element can be provided if a filtration area equivalent to the conventional one is required.
[0019]
According to the first aspect of the present invention, the medium filtration surface and the small filtration surface are disposed one by one between the adjacent large filtration surfaces, and between the medium filtration surfaces disposed at the shortest distance and between the small filtration surfaces. Since two large filtration surfaces are continuously arranged between the surfaces, the ratio of the number of large filtration surfaces to the total filtration surface can be increased, thereby further increasing the filtration area. be able to.
[Brief description of the drawings]
FIG. 1 is a plan view showing a bent state of a filter medium of a filter element according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing an arrangement pattern of a large filtration surface, a medium filtration surface, and a small filtration surface.
FIG. 3 is a plan view showing a bent state of the filter medium of the filter element in the first conventional example.
FIG. 4 is a plan view showing a bent state of a filter medium of a filter element in a second conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filter element 2 Filter material 3, 4 Fold 5 Large filtration surface 6 Medium filtration surface 7 Small filtration surface 8 Cylindrical body

Claims

In a filter element having a large number of filtration surfaces formed by bending a sheet-shaped filter medium into a bellows shape with a large number of folds, and holding both ends of a cylindrical body formed by joining both ends of the filter medium with end plates,
The filtration surface includes a large filtration surface bent on a circumference having a radius substantially equal to the inner diameter of the cylindrical body and a circumference having a radius substantially equal to the outer diameter of the cylinder, and an inner side of the large filtration surface. An intermediate filtration surface bent on a circumference having a radius larger than the circumference and a circumference having a radius substantially equal to the outer diameter of the cylindrical body, and a circumference having a radius larger than the inner circumference of the intermediate filtration surface; Provided separately with a small filtration surface bent on the circumference of a radius substantially equal to the outer diameter of the cylindrical body,
The medium filtration surface and the small filtration surface are arranged one by one between the large filtration surfaces adjacent to each other at a predetermined position in a continuous state, and the medium filtration surface and the small filtration surface are arranged at the shortest distance. The two large filtration surfaces are continuously arranged between the middle filtration surfaces and between the small filtration surfaces,
A filter element characterized by that.