JP2004068620A - Fluid device, blade root coating member for fluid device blades - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide fluid device and blade root coating member for a fluid device blade improving durability of a blade root. <P>SOLUTION: Fluid device includes a housing and an impeller 2 carrying fluid. Edge covering body group 4 having edge covering body 3 having ceramics including a groove 30 fitting to an edge end part 23 of a blade 22 of the impeller 2 as base material arranged in series along the edge end part 23 of the blade 22 is provided. A blade root covered material 6 having ceramics as base material covering a root 22x of the blade 22 is provided adjacently to a last end side of the edge coating body group 4. The blade root covered material 6 includes a cover part 60 arranged adjacently to an edge covering body 3K of the last end side of the edge covering body group 4 and a seating cover part 66 of which projected area is set larger than a projected area of a covered part 60 and is to seat on a rotating board 20 of the impeller 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluid device and a blade base covering member for a fluid device blade.
[0002]
[Prior art]
The prior art of fluid equipment will be described by taking a blower as an example. The blower has a housing and an impeller that moves a fluid as it rotates. The impeller has a rotating disk rotatably provided on a housing and a blade protruding from the rotating disk. Here, conventionally, in JP-A-63-50558, a plurality of edge coverings made of ceramics having a groove fitted to the edge end of the blade of the impeller are used. Then, by fitting the groove of each edge covering to the edge end of the blade in order, an edge covering group formed by arranging the edge coverings in series along the extending direction of the edge end of the blade is provided. Known impellers are known. Adjacent edge coverings are connected to each other by the concave and convex intaglio engagement to form an edge covering group.
[0003]
[Problems to be solved by the invention]
According to the impeller described above, since the edge end of the blade is covered with the edge covering group, the wear resistance and / or heat resistance of the edge end of the blade are dramatically improved. For this reason, even when used for an impeller that conveys a fluid such as air containing hard dust, the durability and life of the impeller can be improved. However, in recent years, there has been an increasing demand for further improvement of durability and long life of blowers. Accordingly, there is an increasing demand for the above-described impeller to have improved durability and longer life. The present invention is a further technical advance of the above-described impeller, and a fluid device and a blade for a fluid device blade capable of improving the protection of the root of the blade and improving the durability and the life of the impeller. It is an object to provide a root covering member.
[0004]
[Means for Solving the Problems]
The fluid device according to the present invention has a housing, a rotating disk provided rotatably on the housing, and a blade protruding from the rotating disk, and an impeller that conveys the fluid with the rotation.
A fluid having a group of edge coatings formed by serially arranging ceramic-based edge coatings having grooves fitted into the edge ends of the blades of the impeller in series along the edge ends of the blades In the device, a blade base covering member made of ceramics covering the root of the blade is provided adjacent to the final end side of the edge covering group, and the blade base covering member is adjacent to the final end side of the edge covering group. The present invention is characterized by having a covering portion arranged and arranged, and a seating covering portion having a projection area set to be larger than a projection area of the covering portion and seated on a rotating disk of the impeller.
[0005]
The blade base covering member for a fluid device blade according to the present invention includes an edge covering body made of ceramics having a groove fitted to an edge end of the blade of the impeller in series along the edge end of the blade. A blade base covering member used together with the edge covering group formed in a row and used adjacent to the final end side of the edge covering body group, wherein the blade base covering member is made of ceramics as a base material. A coating portion disposed on the final end side of the edge coating body group, and a seating coating portion having a projection area set to be larger than the projection area of the coating portion and seating on a rotating disk of the impeller. Things.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
According to a preferred embodiment of the present invention, in the edge covering group, a form in which the adjacent edge covering members are engaged by the intaglio engaging portions can be adopted. Therefore, it is preferable that the edge covering body has a concave and / or convex intaglio engaging portion. According to a preferred embodiment of the present invention, when viewed from the projection direction, the blade root covering member has at least a U-shaped groove that fits into the edge end of the blade, and the groove has a blade root covering. A configuration in which the member extends from the covering portion to the seat covering portion can be employed. According to a preferred embodiment of the present invention, in the blade base covering member, the material of the ceramic serving as the base material of the covering portion and the material of the ceramic serving as the base material of the seating covering portion can be the same or different. In the case of the same material, examples of the ceramic as the base material include silicon nitride, alumina, zirconia, and silicon carbide. When the material is different, ceramics that are advantageous for ensuring abrasion resistance and strength can be adopted as ceramics as a base material of the covering portion, and specific examples thereof include silicon nitride. However, the present invention is not limited to this. As a ceramic material serving as a base material of the seat covering portion, a ceramic material that is advantageous in terms of cost and that is advantageous in ensuring strength can be employed. For example, an alumina-based ceramic material can be used, but the ceramic material is not limited thereto. ADVANTAGE OF THE INVENTION According to this invention, the tile-shaped board | plate material which uses ceramics as a base material is laid on at least one part of a blade | wing, and the seat area | region of a blade | wing base covering member is larger than the projection area per one tile-shaped board | plate material. A form in which the projection area of the covering portion is set large can be adopted. In this case, the joint of the seat covering portion of the blade root covering member can be reduced, which is advantageous for securing strength.
[0007]
【Example】
Hereinafter, a first embodiment of the present invention will be specifically described with reference to FIGS. This embodiment is an embodiment applied to a blower device as a fluid device. The blower is used in an environment that blows air containing hard dust, as exemplified in a steel plant, a steel plant, a casting plant, a cement plant, a ceramic plant, and the like. As shown in FIG. 1, the blower includes a metal housing 1 having a suction port 10, a blade chamber 11, and a discharge port 12 communicating with each other, and rotatably provided in the blade chamber 11 of the housing 1. And an impeller 2 for blowing air. As shown in FIGS. 1 and 2, the impeller 2 has a flat surface 21 and is made of a metal turntable 20 that is driven to rotate about a rotation center PA, and is protruded from the flat face 21 of the turntable 20. And a plurality of metal blades 22. The central area of the turntable 20 is connected to a drive shaft 14 driven by a drive motor, and is driven to rotate by the drive shaft 14.
[0008]
According to this embodiment, the edge covering 3 shown in FIG. 3 is used. The edge covering 3 is made of sintered ceramic as a base material, and is integrally formed of silicon nitride as ceramic. However, it is not limited to silicon nitride. The edge cover 3 has a U-shaped groove 30 having a groove inner surface 31 that fits into the edge end 23 of the blade 22 of the impeller 2. On the front surface 3a of the edge covering body 3, a projection-shaped cage engaging portion 33a is formed. On the back surface 3c of the edge covering body 3, a concave-shaped cage engaging portion 33c is formed. In addition, when the edge-coated body 3 that can be fitted to each other is mounted on the blade 22 of the impeller 2, the convex-shaped inlay engaging part 33 a and the concave in-shaped engaging part 33 c are connected to the groove 30 of the edge covered body 3. With the adhesive interposed between the groove inner surface 31 and the edge end 23 of the blade 22, the groove 30 of the edge covering 3 is fitted to and adhered to the edge end 23 of the blade 22. In this case, as shown in FIG. 4, a plurality of edge coating bodies 3 are arranged in series in a line along the direction in which the edge ends 23 of the blades 22 extend (the direction of the arrow W1). A body group 4 is formed. As described above, the edge covering group 4 is mounted on the edge end 23 of the blade 22. Since the edge coating body group 4 is made of a ceramic base material, the wear resistance of the edge end portion 23 of the metal blade 22 can be dramatically improved. In the edge covering group 4, the adjacent edge coverings 3 are connected to each other by the engagement of the above-described seal engaging portions 33a and 33c.
[0009]
Further, according to the present embodiment, as shown in FIGS. 5 and 6, a blade base covering member 6 based on sintered ceramics is used. The blade base covering member 6 covers a part of the root 22x of the blade 22 facing the turntable 20 in order to protect a base 22x of the blade 22 of the impeller 2 (a part where the blade 22 is connected to the turntable 20). It is. As shown in FIG. 7, the blade base covering member 6 is connected adjacent to the edge covering body 3 </ b> K located on the final end side constituting the edge covering body group 4, and fitted to the base 22 x of the blade 22. Be mounted. In other words, the blade base covering member 6 is attached to the edge end 23 of the base 22x of the blade 22 so as to be interposed between the edge covering 3K located at the final end of the edge covering group 4 and the rotating disk 20 of the blade 22. Be mounted.
[0010]
As shown in FIGS. 5 and 6, the blade base covering member 6 includes a covering portion 60 adjacent to the edge covering member 3 </ b> K on the final end side (closer to the rotating disk 20) of the edge covering member group 4, and a covering portion. The projection area 60 is set to be larger than the projection area, and is integrally formed with a seat covering portion 66 that sits on the turntable 20. The seat covering portion 66 of the blade base covering member 6 has a disk shape, and has a flat seating surface 67 that covers the vicinity of the base 22 x of the blade 22 of the rotary disk 20. As can be understood from FIG. 7, the projected area of the covering portion 60 of the blade root covering member 6 excluding the seat covering portion 66 is basically the same as or approximate to the projected area of the edge covering member 3. The blade base covering member 6 is integrally formed of silicon nitride as a ceramic. This is in consideration of securing wear resistance and strength. In other words, the ceramic material serving as the base material of the covering portion 60 and the ceramic material serving as the base material of the seat covering portion 66 are made of the same material.
[0011]
FIG. 5 shows a form viewed from the direction of arrow A1 (see FIG. 6) which is the projection direction. When viewed from the direction of the arrow A1, which is the projection direction, as shown in FIG. 5, the blade base covering member 6 has a U-shaped groove 61 fitted to the edge end 23 of the blade 22. As shown in FIG. 6, the groove 61 extends from the covering portion 60 of the blade root covering member 6 to the seating covering portion 66 along the arrow W1 direction (the extending direction of the edge end portion 23). Assuming that the thickness of the covering portion 60 is t1 and the thickness of the seat covering portion 66 is t2, the thickness t2 of the seat covering portion 66 is set to be smaller than the thickness t1 of the covering portion 60 (t2 < t1).
[0012]
As shown in FIG. 5, the seat covering portion 66 has a rectangular shape, and has short sides 66a facing each other and long sides 66b facing each other. The length of the long side 66b is longer than the length of the short side. The covering portion 60 has a pair of outer wall surfaces 63 and a connecting surface 64 connecting the outer wall surfaces 63, and the thickness increases toward the opening 61 p of the groove 61, that is, toward the arrow C <b> 1 direction. Have been. The connecting surface 64 is curved in a convex arc shape with a predetermined radius of curvature. The pair of outer wall surfaces 63 is inclined in a V-shape (including a shape approximated to a V-shape) that expands toward the opening 61p of the groove 61. Since the outer wall surface 63 is thus expanded in a V-shape, when the blower is used, hard particles such as dust are prevented from contacting the blade surface 22f of the blade 22 as much as possible, that is, dust or the like. Can fly in the expanding direction (the direction of the arrow E1 shown in FIG. 5) so as to separate the particles from the blade surface 22f of the blade 22. As shown in FIG. 5, the blade base covering member 6 has a symmetrical shape with respect to the center line P1 of the groove 61.
[0013]
As shown in FIG. 6, a convex U-shaped seal engaging portion 69 is formed on the front surface 60 f of the covering portion 60 of the blade base covering member 6. The convex seal engaging portion 69 projects a small amount (dimension F) from the front surface 60f of the covering portion 60. As shown in FIG. 7, the inlay engaging portion 69 is fitted and engaged with the concave inlay engaging portion 33 c of the edge covering 3 </ b> K located on the final end side of the edge covering group 4. This is advantageous in ensuring the connectivity between the edge covering body 3K and the covering portion 60 of the blade base covering member 6.
[0014]
According to the present embodiment, when the blade base covering member 6 is mounted on the blade 22, an adhesive is interposed between the groove inner surface 62 of the groove 61 of the blade base covering member 6 and the edge end 23 of the blade 22. In this state, the groove 61 of the blade base covering member 6 and the edge end 23 of the blade 22 are fitted and adhered. As described above, according to the present embodiment, in the blade root covering member 6, the projected area of the seat covering portion 66 is set to be larger than the projected area of the covering portion 60, so that the seating surface 67 of the seat covering portion 66 A large seating area is secured. Therefore, the seating ability of the seat covering portion 66 is improved. Therefore, when the blade base covering member 6 is mounted on the base 22x of the blade 22, the posture of the blade base covering member 6 can be stabilized. Therefore, even when the impeller 2 rotates, it is possible to contribute to stabilization of the attitude of the blade base covering member 6.
[0015]
According to this embodiment, as shown in FIG. 8, a substantially square tile-shaped plate member 80 made of ceramics (for example, silicon nitride or alumina) is laid on the blade surface 22f of the blade 22 with an adhesive. Have been. Thereby, the exposed area of the metal portion of the blade 22 is reduced, so that the wear resistance and / or heat resistance of the blade 22 is improved. As shown in FIG. 8, a plurality of substantially rectangular tile-shaped plates 84 made of ceramics (for example, silicon nitride or alumina) are also laid in the center area of the turntable 20 with an adhesive. Thereby, the wear resistance and / or heat resistance of the blade 22 are improved. That is, as shown in FIG. 8, a plurality of tile-shaped plate members 84 are laid around the blade base covering member 6. In FIG. 8, reference numeral 80m denotes a joint of the tile-shaped plate member 80 (boundary region of the tile-shaped plate member 80), and reference numeral 84m denotes a joint of the tile-shaped plate member 84 (boundary region of the tile-shaped plate member 84).
[0016]
According to the present embodiment, as shown in FIG. 8, since the tile-shaped plate members 80 and 84 have a small projection area per unit, joints 80m, which are boundaries of the tile-shaped plate members 80 and 84 per unit area, are provided. 84m high density. On the other hand, as shown in FIG. 8, the projected area of the seat covering portion 66 of the blade base covering member 6 is set to be larger than the projected area per tile-shaped plate member 80 or plate member 84. The area occupied by the joints 6m connecting the blade root covering members 6 per unit area and the dense density occupying the unit area are reduced. In general, the joints 80m, 84m, and 6m have a property that they are easily worn as compared with the tile-like plate members 80 and 84 and the blade base covering member 6 formed by sintering ceramics. Therefore, as described above, if the projected area of the blade base covering member 6 is set to be larger than the projected area of one tile-shaped plate member 80 and one tile-shaped plate member 84, the blade base in a unit area is set. The area of the joint 6m of the covering member 6 can be reduced, which can further contribute to the improvement of the durability of the blade base covering member 6. As shown in FIG. 9, the surface 84 u of the plate member 84 is the same as or substantially the same as the height of the surface 66 u of the seat covering portion 66 of the blade base covering member 6.
[0017]
As described above, according to the present embodiment, the blade root covering member 6 is larger than the covering area 60 adjacent to the edge covering body 3K on the final end side of the edge covering body group 4 and the projected area of the covering section 60. The projection area is set large, and is integrally formed with a seat covering portion 66 that sits on the turntable 20. Since the seat covering portion 66 of the blade base covering member 6 covers the turntable 20 of the impeller 2, the wear resistance and / or the vicinity of the base 22x of the blades 22 of the turntable 20 which is required to be strengthened are improved. The heat resistance can be further improved, and the protection of the root 22x of the blade 22 can be further improved. Improving the protection of the root 22x of the blade 22 in this way can further contribute to improving the durability of the blade 22 and extending the life.
[0018]
A load such as a moment applied to the blade 22 acts on the root 22x of the blade 22. For this reason, reinforcement by improving the wear resistance of the root 22x of the blade 22 can effectively contribute to the improvement of the durability of the blower. The improvement in the protection of the root 22x of the blade 22 as described above can contribute to an improvement in the durability and a long life of the blade 22. Further, according to the present embodiment, the projected area of the seat covering portion 66 of the blade root covering member 6 is set to be larger than the projected area of the covering portion 60, and the seating area 67 of the seat covering portion 66 is secured large. Therefore, the seating ability of the seat covering portion 66 on the blade is improved. Therefore, when the blade base covering member 6 is mounted on the base 22x of the blade 22 via the adhesive, it is possible to contribute to stabilization of the posture of the blade base covering member 6. Therefore, even when the impeller 2 rotates at high speed, it is possible to contribute to stabilization of the attitude of the blade base covering member 6. If the posture of the blade root covering member 6 is stabilized in this way, it is further advantageous in stabilizing the posture of the plurality of edge covering members 3 constituting the edge covering member group 4. Also in this sense, it is possible to further contribute to the improvement of the durability of the blade 22 of the impeller 2 and the extension of the service life.
[0019]
(Second Embodiment) FIG. 10 shows a second embodiment of the present invention. This embodiment has basically the same configuration as the above-described first embodiment, and basically has the same operation and effect. Common parts are denoted by common reference numerals. Also in the present embodiment, the blade root covering member 6B includes a covering portion 60B having a seal engaging portion 69 that engages with the edge covering member 3K on the final end side of the edge covering member group 4, and a projected area of the covering portion 60B. And a seat covering portion 66 </ b> B which has a larger projected area and is seated on the turntable 20. At the boundary between the covering portion 60B and the seat covering portion 66B, a thickness adjusting portion 70 having an arc-shaped cross section is formed in order to reduce a sudden change in thickness. This suppresses a change in thickness between the covering portion 60B and the seat covering portion 66B, and can contribute to an improvement in the durability of the blade base covering member 6B.
[0020]
(Third Embodiment) FIG. 11 shows a third embodiment of the present invention. This embodiment has basically the same configuration as the above-described first embodiment, and basically has the same operation and effect. Also in the present embodiment, the blade base covering member 6C is integrally formed with a covering portion 60C and a seating covering portion 66C whose projected area is set to be larger than the projected area of the covering portion 60C. The blade base covering member 6C has a groove 61C having a J-shape (the J-shape includes at least a U-shape) fitted to the edge end 23 of the blade 22.
[0021]
(Fourth Embodiment) FIG. 12 shows a fourth embodiment of the present invention. This embodiment has basically the same configuration as the above-described first embodiment, and basically has the same operation and effect. Common parts are denoted by common reference numerals. Also in the present embodiment, the blade base covering member 6D is set to have a projection area larger than the projection area of the covering section 60D that engages with the edge covering body 3K on the final end side of the edge covering body group 4 and the covering section 60D. It is constituted by firing integrally with the seat covering portion 66D. In the blade base covering member 6D, the ceramic that is the base material of the covering portion 60D is silicon nitride. This is in consideration of securing abrasion resistance and strength. The ceramic used as the base material of the seat covering portion 66D is alumina. This is in consideration of cost, strength, and the like. In some cases, the seat covering portion 66D and the covering portion 60D may be integrated by joining.
[0022]
(Others) In the above-described embodiment, the grooves 30 and 61 have a U-shape. However, the present invention is not limited to this, and the grooves 30 and 61 may have a J-shape as shown in FIG. . The seat covering portion 66 has a rectangular shape, but is not limited thereto, and may have an oval shape or a circular shape. In some cases, the edge covering member and the blade base covering member may be in a form that does not have the intaglio engaging portion. In short, the shape and the material of the covering portion and the seating covering portion constituting the blade root covering member are not limited to the above-described embodiment. The blades of the blower are not limited to the above-described structure, but may be any as long as they can transport a fluid such as air or liquid. The housing 1 of the blower is not limited to the above structure. According to the above-described embodiment, the present invention is applied to a blower that supplies air. However, the present invention is not limited to this, and can be applied to a pump device that supplies a liquid such as water, and can be generally applied to fluid devices. According to the above-described embodiment, the tile-shaped plate members 80, 84 are laid on the impeller 2, but a type in which the tile-shaped plate members 80, 84 are not laid on the impeller 2 may be used. The operating environment of the impeller 2 may be a normal temperature region, or may be any of a heating region, a warm region, and a cold region. The materials of the covering portion and the seat covering portion constituting the blade base covering member are not limited to those described above. In addition, the present invention is not limited to only the above-described embodiments, and it is a matter of course that the present invention can be appropriately modified and implemented without departing from the scope of the present invention. Even if the phrases described in the embodiments and examples of the invention are only a part, they can be described in the claims.
[0023]
【The invention's effect】
As described above, according to the present invention, the blade base covering member is seated on the turntable having the covering area disposed on the final end side of the edge covering body group and the projected area larger than the projected area of the covering section. And a seating covering portion. Since the seat covering portion of the blade root covering member covers the rotating disk of the impeller, the wear resistance and / or heat resistance of the rotating disk near the blade root can be improved, and the blade root can be improved. The protection can be improved. Improving the protection of the root of the blade in this way can further contribute to the improvement of the durability and the life of the blade.
[0024]
Further, according to the present invention, the projected area of the seat covering portion is set larger than the covering portion, and the seating area of the seating surface of the seat projecting portion is ensured large, so that the seating property of the seat projecting portion on the blade is improved. When the blade base covering member is mounted on the base of the blade, it is possible to contribute to stabilization of the posture of the blade base covering member. For this reason, even when the impeller rotates at high speed, it is possible to contribute to stabilization of the posture of the blade base covering member. If the posture of the blade base covering member is stabilized in this way, it is also advantageous for stabilizing the posture of the plurality of edge covering members constituting the edge covering member group, and in this sense, the durability of the blade is improved, It can further contribute to longer life.
[Brief description of the drawings]
FIG. 1 is a sectional view of a blower.
FIG. 2 is a cross-sectional view of the blower that is cut in different directions.
FIG. 3 is a side view of the edge covering.
FIG. 4 is a partial perspective view showing a state in which a group of edge coatings in which a plurality of edge coatings are arranged in series are mounted on an edge end of a blade.
FIG. 5 is a front view of a blade root covering member.
FIG. 6 is a side view of the blade base covering member.
FIG. 7 is a side view showing a state in which an edge covering group including a plurality of edge covering bodies is mounted on an edge end of a blade, and a blade root covering member is mounted on the root of the blade.
FIG. 8 is a front view partially showing a state where a tile-shaped plate member is mounted on the blade of the blower, and showing a state where the blade base covering member is mounted on the base of the blade.
FIG. 9 is a cross-sectional view showing a state in which an edge covering body group including a plurality of edge covering bodies is mounted on an edge end of a blade, and a blade base covering member is mounted on the root of the blade.
FIG. 10 is a side view of a blade root covering member according to the second embodiment.
FIG. 11 is a front view of a blade base covering member according to a third embodiment.
FIG. 12 is a front view of a blade base covering member according to a fourth embodiment.
[Explanation of symbols]
In the figure, 1 is a housing, 10 is a suction port, 12 is a discharge port, 2 is an impeller, 20 is a rotating disk, 22 is a blade, 23 is an edge end, 3 is an edge cover, 4 is an edge cover group, 6 is a blade base covering member, 60 is a covering portion, 66 is a seating covering portion, and 67 is a seating surface.

Claims (5)

A housing,
An impeller that has a rotating disk rotatably provided in the housing and a blade protrudingly provided on the rotating disk, and conveys fluid with rotation,
A fluid having a group of edge coatings formed by arranging ceramic-based edge coatings having grooves fitted into the edge ends of the blades of the impeller in series along the edge ends of the blades In the equipment,
A blade base covering member made of ceramics covering the base of the blade is provided adjacent to the final end side of the edge covering group,
The blade base covering member is
It is characterized by having a covering portion arranged adjacent to the final end side of the edge covering body group, and a seating covering portion having a projection area set to be larger than a projection area of the covering portion and seating on a rotating disk of the impeller. And fluid equipment. In claim 1, when viewed from the projection direction, the blade root covering member has at least a U-shaped groove fitted to an edge end of the blade,
The fluid device, wherein the groove extends from the covering portion of the blade root covering member to the seating covering portion. 3. The fluid device according to claim 1, wherein in the blade root covering member, the material of the ceramic serving as the base material of the covering portion and the material of the ceramic serving as the base material of the seating covering portion are the same or different. 4. In any one of claims 1 to 3, a plurality of tile-shaped plate materials based on ceramics are laid on at least a part of the blades of the impeller, and one tile-shaped plate material is provided. A fluid device, wherein a projected area of a seat covering portion of a blade root covering member is set to be larger than a projected area. Used together with an edge coating group formed by arranging an edge coating body based on ceramics having a groove to be fitted to the edge end of the blade of the impeller in series along the edge end of the blade, A blade base covering member used adjacent to the final end side of the edge covering body group,
The blade base covering member is made of ceramic as a base material,
A fluid device, comprising: a covering portion arranged on the final end side of an edge covering group; and a seating covering portion having a projected area larger than a projected area of the covering portion and seated on a rotating disk of an impeller. A blade base covering member for the blade.

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