JP2010137190A - Core material of impeller, impeller, and stirrer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the core material of an impeller capable of sufficiently imparting the torque from a rotary shaft to the impeller and capable of being operated stably, the impeller and a stirrer. <P>SOLUTION: Torque transmitting surfaces TP1, TP2 or the like, which circumferentially cross the rotary shaft and have widths in the axial direction of the rotary axis, among the outer peripheral surfaces of the protruded parts 34 of the core material 3 and inner peripheral surfaces of the hole parts 35 of the protruded parts 34 are formed around the rotary shaft in a rotationally symmetric state and the circumferential forces F1, F2 or the like of the rotary shaft are transmitted to a fiber reinforced resin through the torque transmitting surfaces TP1, TP2 or the like. At that time, when the angle formed by the circumferential force F1 of the rotary shaft and the torque transmitting surface TP1 is set to θ and the angle formed by the circumferential force F2 of the rotary shaft and the torque transmitting surface TP2 is set to ω, the angles θ and ω become an acute angle larger than 45° or a right angle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an impeller core member, an impeller, and a stirrer that are fixed to each other inside a boss with articulated blades via a fiber reinforced resin and transmit a rotational force from a rotating shaft to the boss.

  Conventionally, in a sewage treatment plant, a water treatment plant, a wastewater treatment plant, etc., a reaction tank is provided in a water treatment facility. For example, in a sewage treatment plant, anaerobic tanks and oxygen-free tanks may be provided to remove nutrients such as nitrogen and phosphorus from wastewater and to counter bulking. These tanks are equipped with a stirrer. ing.

As shown in FIG. 8, the stirrer 90 has an impeller 93 fixed to one end of a rotating shaft 92 of an electric motor 91. The impeller 93 rotates along with the rotation of the rotating shaft 92, and a swirling flow is generated in the reaction vessel 81a. generate. The stirrer 90 is required to have a performance such that the flow rate at a height of 0.1 m from the bottom of the reaction tank 81a is 0.1 m / s or more so as not to precipitate activated sludge in the tank.
JP 2003-144886 A

  In order to prevent an energy loss due to a speed difference between the flow generated by the rotation of the impeller 93 and the swirling flow in the anaerobic tank from increasing, the impeller 93 may be lengthened and rotated slowly.

  As described above, when the blades 94 are lengthened, the torque for rotating the impeller 93 is increased. Therefore, stress is concentrated on the connecting portion between the rotating shaft 92 and the impeller 93, and the connecting portion may be idle or damaged. was there.

  Further, the stirrer 94 may generate an upward flow or a downward flow depending on the tank in which it is installed. For example, when the flow velocity at a height of 0.1 m from the bottom satisfies 0.1 m / s or more with low power consumption, a downward flow is generated so that the flow generated by the impeller is directed toward the bottom of the tank. On the other hand, in order to destroy the scum generated on the water surface, there are various uses such as generating an upward flow and increasing the flow velocity of the water surface portion.

  In order to change the upward flow and the downward flow, for example, a means for simply rotating the impeller 93 may be considered. However, in the case of the blade 94 with a receding angle, if the impeller 93 is rotated reversely, foreign matter is generated. It is not preferable because it is entangled with the blade. Further, if two types of impeller for generating an upward flow and an impeller for generating a downward flow are manufactured, the manufacturing cost increases. In order to avoid this, it is conceivable to switch the direction in which the flow is generated by manufacturing the blade and the boss constituting the impeller separately and reversing the mounting direction of the blade to the boss.

  In Patent Document 1, as shown in FIG. 9, a blade 96 is detachably attached to a support arm 97b extending from a cylindrical boss 97a using a plurality of bolts 99b, and the boss 97a is attached to a rotating shaft. An impeller 95 configured to be attached to a predetermined portion of the rotating shaft 98 by being fitted around the periphery of 98 and tightened with a screw 99a screwed into the peripheral wall of the boss 97a is disclosed.

  However, as described above, in the configuration in which the boss 97a is screwed to the rotary shaft 98 with the screw 99a, when the torque for rotating the impeller 95 is increased, the stress is concentrated on the screwed portion, resulting in breakage and idling. Or the rotational axis of the rotary shaft 98 may be eccentric.

  In the configuration in which the blade 96 is detachably attached to the support arm 97b extending from the boss 97a using a plurality of bolts 99b, the gap between the boss 97a and the screw 99a, the gap between the blade 96 and the support arm 97b, There is a risk that sewage residue may be entangled with screws 99a, bolts 99b, etc. When the sewage residue is entangled with the gap or the like, the balance of the blades 96 is biased and the rotational axis of the rotary shaft 98 is eccentric. Excessive power is required, and energy loss may increase.

  An object of the present invention is to provide an impeller core, an impeller, and a stirrer that can sufficiently apply torque from a rotating shaft to an impeller and can be stably operated.

  In order to achieve the above object, the first characteristic configuration of the core material of the impeller according to the present invention is, as described in claim 1 of the claims, in the boss where the blades are articulated, An impeller core member that is fixed via a fiber reinforced resin and that transmits a rotational force from a rotating shaft to the boss, and a circumferential direction of the rotating shaft at a joint portion of the core member with respect to the fiber reinforced resin; A torque transmitting surface that intersects and has a width in the axial direction of the rotating shaft is formed around the rotating shaft, and torque applied from the rotating shaft is transmitted to the fiber reinforced resin through the torque transmitting surface. Impeller core material configured to be In the point.

  According to the above configuration, since the torque transmission surface that transmits the torque applied from the rotation shaft to the fiber reinforced resin is formed around the rotation shaft, the power of the rotation shaft is stably supplied from the torque transmission surface to the boss. It is transmitted and the impeller can be rotated stably.

  In addition to the first feature configuration described above, the second feature configuration is an acute angle in which the angle at which the torque transmission surface intersects the circumferential direction of the rotation shaft is greater than 45 degrees, or It is in the point formed so that it may become a right angle.

  The force applied to the fiber reinforced resin by the torque transmission surface is composed of a force component perpendicular to the torque transmission surface and a parallel force component, and the force component perpendicular to the torque transmission surface is transmitted to the fiber reinforced resin. However, the force component parallel to the torque transmission surface causes a relative shift between the core material and the fiber reinforced resin. Therefore, since the torque transmission surface is formed so that the angle intersecting the circumferential direction of the rotating shaft is an acute angle or a right angle greater than at least 45 degrees, the force component parallel to the torque transmission surface can be reduced, so that the core material And relative displacement of the fiber reinforced resin can be suppressed. The force component perpendicular to the torque transmission surface is efficiently transmitted to the boss through the fiber reinforced resin.

  In the third feature configuration, as described in claim 3, in addition to the first or second feature configuration described above, the torque transmission surface is formed on an outer peripheral portion of the core member. In the point.

  According to the above-described configuration, the force applied to the torque transmission surface can be reduced as the torque transmission surface formed on the outer peripheral portion of the core material is separated from the rotation shaft, which causes a relative deviation between the core material and the fiber reinforced resin. The force component parallel to the torque transmission surface can be reduced.

  In the fourth feature configuration, in addition to any one of the first to third feature configurations described above, the torque transmission surface is formed in the hole formed in the core member. It exists in the point formed in the surrounding surface.

  According to the configuration described above, the area of the torque transmission surface can be increased without changing the size of the core material. Moreover, the physical coupling | bonding of a core material and fiber reinforced resin becomes larger.

  In the fifth feature configuration, as described in claim 5, in addition to any of the first to fourth feature configurations described above, the torque transmission surface is a protrusion formed on the surface of the core member. It is in the point formed.

  The sixth characteristic configuration is that, as described in claim 6, in addition to any of the first to fifth characteristic configurations described above, the outer periphery of the core material is configured by an uneven surface. .

  In the seventh feature configuration, in addition to any one of the first to sixth feature configurations described above, the core material is formed vertically symmetrical and connected to the boss. In other words, the center of the base end of the blade is disposed at substantially the same height as the axial direction.

  According to the above-described configuration, since the rotation shaft can be connected from any of the axial directions of the core material, the flow generated by the rotation of the impeller can be changed by changing the top and bottom of the impeller connected to the rotation shaft. The direction can be upward or downward. And since the core material is disposed at substantially the same height as the base end of the blade, even if the impeller connected to the rotating shaft is changed up and down, the position of the blade in the reaction tank is greatly changed. There is no.

  In the eighth feature configuration, in addition to any one of the first to sixth feature configurations described above, the joint portion between the core member and the rotary shaft is formed by a taper surface contact. It is a friction type fastening, and the outer surface of the core material is formed symmetrically.

  According to the above-described configuration, the degree of adhesion between the rotating shaft and the core material is increased, and the rotating shaft and the core material are integrated, so that there is less play when the agitator is started, and the durability of the agitator is improved. improves. In addition, if the orientation of the core material is changed when fixing the core material to the boss, it is possible to manufacture by selecting the impeller of the upward flow and the downward flow arbitrarily, and the cost can be reduced because the mold can be shared. Can be planned.

  The characteristic configuration of the impeller according to the present invention includes the core material of the impeller having any one of the first to eighth characteristic configurations described above, as recited in claim 9 of the claims. The blade and the boss are integrally formed of fiber reinforced resin.

  According to the above-described configuration, since it can be formed into a seamless and smooth shape that reduces surface resistance, it becomes a shape in which foreign matter such as solid matter and fiber in sewage is not easily entangled, and there are many foreign matters. Stable operation can be realized even with sewage and sludge.

  The characteristic configuration of the stirrer according to the present invention is that an impeller having the above-described characteristic configuration is attached to a rotating shaft, as described in claim 10 of the claims.

  As described above, according to the present invention, it is possible to provide an impeller core material, an impeller, and a stirrer that can sufficiently apply torque from the rotating shaft to the impeller and can perform stable operation. Can do.

  Below, the core material, impeller, and stirrer of the impeller by this invention are demonstrated.

  As shown in FIGS. 1A and 1B, the stirrer includes an impeller 1 and an electric motor (not shown), and the rotating shaft 2 of the electric motor is connected to the core material 3 provided in the impeller 1. The impeller 1 is configured to rotate integrally with the rotary shaft 2.

  In the impeller 1, a plurality of blades 4 and a boss 5 are integrally formed of fiber reinforced resin.

  As shown in FIGS. 2A and 2B, an opening 31 through which the rotary shaft 2 can be inserted is formed at the center of the core material 3, a key groove 32 is formed in the opening 31, and an outer periphery is formed. A plurality of concave portions 33 and convex portions 34 are formed, and a hole portion 35 is formed in the convex portion 34.

  Of the outer peripheral surface of the protrusion 34 and the inner peripheral surface of the hole 35, torque transmission surfaces TP 1 and TP 2 that intersect with the circumferential direction of the rotating shaft 2 and have a width in the axial direction of the rotating shaft 2 are around the rotating shaft 2. The circumferential forces F1 and F2 of the rotary shaft 2 are transmitted to the fiber reinforced resin via the torque transmission surfaces TP1 and TP2.

  Here, if the angle formed by the circumferential force F1 of the rotating shaft 2 and the torque transmission surface TP1 is θ, the circumferential force F1 of the rotating shaft 2 is parallel to the force F1sin θ perpendicular to the torque transmitting surface TP1. The force F1 cos θ that can be divided into the force F1 cos θ and perpendicular to the torque transmission surface TP1 is transmitted to the fiber reinforced resin, but the force F1 cos θ parallel to the torque transmission surface TP1 is a relative force between the core material 3 and the fiber reinforced resin. It causes a gap. The same applies to the circumferential force F2. Therefore, by forming the torque transmission surface TP1 so that the angle θ intersecting the circumferential force F1 of the rotating shaft 2 is an acute angle or a right angle larger than 45 degrees, the force F1 cos θ parallel to the torque transmission surface TP1 is reduced. Therefore, the physical bond between the core material 3 and the fiber reinforced resin becomes larger, and the occurrence of relative deviation can be suppressed.

  Assuming that the angle formed between the circumferential force F2 of the rotating shaft 2 and the torque transmission surface TP2 is ω, the angle ω at which the torque transmitting surface TP2 intersects the circumferential force F2 of the rotating shaft 2 is at least as described above. By forming an acute angle or a right angle greater than 45 degrees, the force F2 cos θ parallel to the torque transmission surface TP2 can be reduced, so that the physical bond between the core material 3 and the fiber reinforced resin is increased, and the relative displacement is increased. Occurrence can be suppressed.

  Furthermore, by increasing the torque transmission surface that transmits the torque of the rotating shaft 2 to the fiber reinforced resin, the force applied to the fiber reinforced resin by the rotation of the core material can be distributed and transmitted. Thus, the physical coupling becomes larger and the occurrence of relative deviation can be suppressed.

  In addition, by forming the torque transmission surface to be rotationally symmetric about the rotation axis, the force components perpendicular to the torque transmission surface and the force components parallel to the torque transmission surface are balanced with respect to the rotation axis. The car can be rotated stably. Further, as shown in FIG. 2, when the convex portion is axisymmetric, a torque transmission surface opposite to the torque transmission surface TP1 is formed on the opposite side. The shaft torque can be stably transmitted to the impeller.

  The core material 3 is symmetrical with respect to the rotating shaft 2 by iron, stainless steel, ceramic, casting, resin, etc. having sufficient strength to transmit the torque applied from the rotating shaft 2 to the fiber reinforced resin, in a side view. It is formed symmetrically up and down.

  Hereinafter, the process of joining the core material 3 to the inside of the impeller 1 through the fiber reinforced resin will be described.

  As shown in FIG. 3 (a), the core material 3 is placed inside the boss 5 formed in a hollow cylindrical shape by a jig or the like (not shown), and the axial center direction of the center between the boss 5 and the base end portion of the blade 4 As shown in FIG. 3B, the fiber reinforced resin such as a glass mat in which the inner surface of the boss 5 and the surface of the core material 3 are impregnated with a resin by a hand lay-up method, as shown in FIG. As shown in FIG. 3C, the boss 5 is reversed and the back side is similarly covered with fiber reinforced resin, and the boss 5 and the core material 3 are integrally joined.

  Since the core material 3 is formed symmetrically in the vertical direction and is disposed at substantially the same height as the center of the base end portion of the blade 4 connected to the impeller boss, it is connected to the rotation shaft. Even when the vertical direction of the impeller is changed, the torque transmitted by the torque transmission surfaces TP1 and TP2 can be efficiently transmitted to the blade 4 in the same manner.

  Next, the connection between the impeller 1 and the rotating shaft 2 will be described.

  As shown in FIG. 4 (a), the rotary shaft 2 fitted with the key 30 is inserted into the opening 31 of the core 3 integrally joined to the boss 5 by fiber reinforced resin, and FIG. As shown, the nut 9 is fastened to the threaded portion 8 formed at the tip of the rotating shaft 2 so that the rotating shaft 2 and the impeller 1 rotate integrally.

  Since the opening 31 of the core member 3 is formed so that the rotary shaft 2 can be inserted from the vertical direction on the paper surface, by changing the vertical direction connected to the rotary shaft 2, as shown in FIG. The flow generated by the vehicle 1 can be directed upward, or the flow generated by the impeller 1 can be directed downward as shown in FIG. 5B.

  As described above, the stirrer in which the impeller 1 is attached to the rotating shaft 2 is configured.

  Hereinafter, another embodiment of the core material of the impeller according to the present invention will be described.

  In the above-described embodiment, the configuration in which the rotating shaft and the core material are fixed with the key has been described. However, as illustrated in FIG. 7, the tapered surface 31 is formed on the contact surface between the rotating shaft 2 and the core material 30. For example, the end portion of the rotating shaft 2 inserted through the core member 30 may be tightened by a screw 32 so that the core member and the rotating shaft are joined by frictional fastening by contact with a tapered surface.

  The torque transmission surface is formed by forming a hole in the core material, forming a protrusion on the surface of the core material, forming an uneven surface on the outer periphery of the core material, roughening the surface of the core material, A minute uneven surface can be formed on the surface, or any of these can be combined.

  For example, as shown in FIGS. 6A and 6B, the core member 11 has an opening 12 through which the rotation shaft can be inserted at the center, a keyway 13 is formed in the opening 12, and Alternatively, a plurality of substantially trapezoidal flat plates 14 may be formed so as to be rotationally symmetric.

  Of the surfaces constituting the flat plate 14, a torque transmission surface TP3 that intersects the circumferential direction of the rotating shaft and has a width in the axial direction of the rotating shaft is formed in a rotationally symmetrical manner around the rotating shaft. F3 is transmitted to the fiber reinforced resin through the torque transmission surface TP3. The angle γ formed by the circumferential force F3 of the rotating shaft and the torque transmission surface TP3 is an acute angle or a right angle greater than 45 degrees.

  As shown in FIGS. 6C and 6D, the core member 17 has an opening 18 through which the rotation shaft can be inserted at the center, and a key groove 19 is formed in the opening 18 so as to surround the rotation shaft. Alternatively, an elliptical columnar projection 21 and a prismatic projection 22 may be formed on the surface of the disk-shaped flat plate 20 so as to be rotationally symmetric.

  Torque transmission surfaces TP4 and TP5 that intersect the circumferential direction of the rotating shaft and have a width in the new axis direction of the rotating shaft among the surfaces constituting the protrusions 21 and 22 are formed rotationally symmetrically around the rotating shaft. The circumferential forces F4 and F5 are transmitted to the fiber reinforced resin via the torque transmission surfaces TP4 and TP5. The angles η and ζ formed by the circumferential forces F4 and F5 of the rotating shaft and the torque transmission surfaces TP4 and TP5 are acute angles or right angles greater than 45 degrees, respectively.

  As described above, the torque transmission surface is formed so that the angle intersecting the circumferential direction of the rotating shaft is an acute angle or a right angle larger than at least 45 degrees, so that the torque from the rotating shaft is bonded to the core material. It can be sufficiently applied to the impeller through the reinforced resin.

  In the above-described embodiment, the case where the blade 4 and the boss 5 are connected by the hand lay-up method has been described. However, the blade 4 and the boss 5 may be integrally formed by a spray-up method, an injection molding method, or the like. In addition, by finishing the boundary between the blades and the bosses in a smooth shape, it becomes a shape in which foreign matter is less likely to be entangled, and a stable operation can be realized. Further, the power loss can be reduced by providing the blade with a receding angle with respect to the rotational direction.

  In the embodiment described above, the case where there are two blades 4 constituting the impeller 1 is described, but the number of blades 4 is not limited to two, and may be three or more.

  The stirrer according to the present invention is not limited to use in a reaction tank such as an anaerobic tank or an oxygen-free tank in a sewage treatment plant, but can also be used for wastewater treatment other than sewage treatment, and blades installed in the tank. What is necessary is just to set the height of a car suitably.

  The specific configuration of each part of the impeller core material, the impeller, and the stirrer described above is not limited to the description of the embodiment, and the specific configuration, dimensions, etc. of each part within the scope of the effects of the present invention. Needless to say, can be appropriately modified.

(A) is a plan view of a stirrer according to the present invention, and (b) is a side view of the stirrer. (A) is a plan view of the core material, (b) is a side view of the core material (A) is explanatory drawing about joining of a boss | hub and a core material, (b) is explanatory drawing about joining of a boss | hub and a core material, (c) is explanatory drawing about joining of a boss | hub and a core material. (A) is explanatory drawing about the connection of a rotating shaft and an impeller, (b) is explanatory drawing with which the rotating shaft and the impeller were connected. (A) is explanatory drawing of the attachment direction of the impeller which generates an upward flow, (b) is explanatory drawing of the attachment direction of the impeller which generates a downward flow (A) is a plan view of a core material according to another embodiment, (b) is a side view of the core material according to another embodiment, (c) is a plan view of the core material according to another embodiment, and (d) is according to another embodiment. Side view of the core material, Explanatory drawing of the core material by another embodiment Schematic diagram of a conventional stirrer Schematic diagram of conventional impeller impeller

Explanation of symbols

1: impeller 2: rotating shaft 3: core material 4: blade 5: boss 7: fiber reinforced resin 8: screw part 9: nut 11: core material 12: opening 13: keyway 14: flat plate 17: core material 18: Opening 19: Key groove 20: Flat plate 21: Protruding part 22: Protruding part 30: Key 31: Opening 32: Key groove 33: Concave part 34: Convex part 35: Hole part F1: Force F2: Force F3: Force F4: Force F5 : Force θ: angle ω: angle γ: angle η: angle ζ: angle TP1: torque transmission surface TP2: torque transmission surface TP3: torque transmission surface TP4: torque transmission surface TP5: torque transmission surface

Claims (10)

The impeller is fixed to the inside of the boss where the blades are articulated through a fiber reinforced resin, and the impeller core material transmits the rotational force from the rotating shaft to the boss,
A torque transmission surface that intersects the circumferential direction of the rotating shaft and has a width in the axial direction of the rotating shaft is formed around the rotating shaft at a joint portion of the core material to the fiber reinforced resin, and the rotating shaft A core material of an impeller configured to transmit torque applied from the above to the fiber reinforced resin via the torque transmission surface.   The impeller core material according to claim 1, wherein the torque transmission surface is formed so that an angle intersecting a circumferential direction of the rotation shaft is an acute angle or a right angle larger than 45 degrees.   The impeller core material according to claim 1, wherein the torque transmission surface is formed on an outer peripheral portion of the core material.   The impeller core material according to any one of claims 1 to 3, wherein the torque transmission surface is formed on an inner peripheral surface of a hole formed in the core material.   The impeller core material according to any one of claims 1 to 4, wherein the torque transmission surface is formed on a protrusion formed on a surface of the core material.   The impeller core material according to any one of claims 1 to 5, wherein an outer periphery of the core material is formed of an uneven surface.   The core material according to any one of claims 1 to 6, wherein the core material is formed in a vertically symmetrical manner and is disposed at substantially the same height as the height in the axial direction of the center of the base end portion of the blade connected to the boss. The core material of the impeller described in 1.   The impeller according to any one of claims 1 to 6, wherein a joint portion between the core material and the rotating shaft is friction-type fastening by taper surface contact, and an outer surface of the core material is formed vertically symmetrical. Core material.   An impeller comprising the impeller core material according to any one of claims 1 to 8, wherein the blade and the boss are integrally formed of fiber reinforced resin.   An agitator in which the impeller according to claim 9 is attached to a rotating shaft.

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