JP5329297B2 - Multi-blade impeller - Google Patents

Description

  The present invention relates to a multi-blade impeller used for industrial machines, air conditioners and the like.

  The fixing structure of the main plate and the side plate and the blade in the multi-blade impeller composed of the main plate, the side plate and the blade is inserted into the blade mounting hole provided in the main plate and the side plate, and the projecting piece provided at the end of the blade is inserted. A structure in which the protrusion is bent to fix the main plate and the side plate and a structure in which the blade, the main plate, and the side plate are fixed by welding are generally used. And the thing shown by patent document 1 and patent document 2 is known as a multi-blade impeller which has a side plate and is cheap, lightweight, reliable and can improve performance.

  In Patent Document 1 described above, since the high fixing strength of the blade, the main plate, and the side plate is ensured and sufficient reliability is obtained, the plate thickness of the main plate, the side plate, and the blade can be made as thin as possible. In addition to reducing the weight of the impeller and reducing the cost of materials, etc., it has been used in recent products by reducing the load applied to the drive system of the multi-blade impeller. It is possible to improve the responsiveness of the rotational speed control of the multi-blade impeller by the inverter, and to improve the performance of a product using the multi-blade impeller.

  However, in Patent Document 1, when the blades, the main plate, and the side plates are made thin, the rigidity of the main plate tends to decrease particularly as the diameter of the impeller increases. There is room for improvement.

  Further, in Patent Document 2 described above, a circular or semicircular curl shape is provided on the outer peripheral portion of the main plate and a single or double bead shape is provided around the boss in order to compensate for insufficient strength when the plate is thinned. Furthermore, the strength of the multi-blade impeller, which was generally manufactured in spite of being a thin plate, is conventionally increased by caulking the reinforcing plate between the main plate and the boss. In addition to securing the strength comparable to that of the main plate, by curling the outer periphery of the main plate, tension is given to the whole and distortion is also eliminated by beads etc., making it tough and lightweight, and low cost and good performance due to material cost saving etc. A multi-blade impeller can be obtained.

  However, in Patent Document 2, as the diameter of the impeller increases, it becomes difficult to form a circular or semicircular curl shape on the entire outer peripheral portion, and the mold for molding the curl shape becomes large and complicated. As a result, there is a problem that the mold production cost becomes high.

JP 2008-95605 A JP 61-25999 A

  In the prior art, when the blades, main plate, and side plates are made as thin as possible to reduce cost and weight, the rigidity of the main plate tends to decrease especially as the impeller diameter increases. The reliability of strength was affected, which was not preferable.

  Further, when a circular or semicircular curled shape is added to the entire outer peripheral portion of the main plate, it becomes difficult to mold the curled shape of the outer peripheral portion as the diameter of the impeller becomes larger, which is not preferable in terms of molding. Furthermore, since the mold for molding the curl shape has a large and complicated structure, there is a problem in that the mold production cost increases.

  Therefore, a first object of the present invention is to reinforce the strength of the main plate, which becomes particularly insufficient as the impeller diameter increases, by adding as simple a shape as possible to the main plate.

  The second object of the present invention is to provide a simple structure in which the mold structure necessary for forming the reinforcing convex shape is molded only in the pressing direction.

  A third object of the present invention is to add a reinforcing convex shape so as to avoid the blade and the blade fixing portion, so that the strength of the blade and the blade fixing portion is not affected.

  The fourth object of the present invention is to achieve the third object from the first object by reducing the material cost and the like while keeping the cost low, light and highly reliable, and improving the responsiveness of the rotational speed control. .

  In order to achieve the above-mentioned object, a multi-blade impeller according to the present invention is provided between a main plate, a side plate having a suction port in the center, the main plate and the side plate, and is arcuate in a radial direction. A multi-blade impeller having a large number of extending blades has a reinforcing convex shape molded at a position along the outer peripheral portion of the main plate so as to avoid the fixed portion of the blades.

  In the multi-blade impeller according to the present invention, the reinforcing convex shape is extruded in a direction opposite to the side plate.

  A multi-blade impeller of the present invention includes a main plate, a side plate having a suction port in the center, and a plurality of blades provided between the main plate and the side plate and extending in an arc shape in the radial direction. The airfoil impeller is located at a position avoiding the fixed portion of the blade, and has a reinforcing convex shape that widens from the outer peripheral portion of the main plate to the central axis direction of the main plate.

  In the multi-blade impeller according to the present invention, the reinforcing convex shape is extruded in a direction opposite to the side plate.

  The first effect of the present invention is to reduce the weight of the impeller by adding a reinforcing convex shape that is formed by extruding the outer side of the main plate in the press direction in the opposite direction to the side plate so as to avoid the blade and the blade fixing portion. Therefore, even if the plate thickness is reduced, it is possible to ensure the same strength as before reducing the plate thickness, and even if the impeller diameter increases, the main plate can be configured as thin as possible. become able to do.

  The second effect of the present invention is that the mold structure necessary for forming the reinforcing convex shape is a simple structure that is molded only in the pressing direction, and therefore the mold production cost can be reduced.

  According to the third effect of the present invention, the reinforcing convex shape can be added so as to avoid the blade and the blade fixing portion, so that the strength of the blade and the blade fixing portion is not affected.

  The fourth effect of the present invention is a multi-blade that is inexpensive, lightweight, highly reliable, and can improve the responsiveness of the rotational speed control while suppressing costs such as material costs by the first effect to the third effect. You can get an impeller.

It is the top view and sectional view seen from the main plate side of the multi-blade impeller concerning the 1st example of the present invention. It is an outer peripheral part convex-shaped enlarged view for reinforcement of the sectional view concerning the 1st example of the present invention. It is the top view and sectional drawing seen from the main plate side of the multi-blade impeller concerning the 2nd example of the present invention. It is an outer peripheral part convex-shaped enlarged view for reinforcement of the sectional view concerning the 2nd example of the present invention. It is the attachment block diagram of the 1st blade | wing concerning the 3rd Example of this invention. It is the attachment block diagram of the 2nd blade | wing concerning the 3rd Example of this invention.

  Examples will be described below. The embodiment described below is one aspect, and can be modified and modified within the scope that can be easily conceived by those skilled in the art.

  First, a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a plan view and a cross-sectional view of the multi-blade impeller of this embodiment as viewed from the main plate side.

  FIG. 2 is an enlarged view of the convex shape of the outer periphery for reinforcement in the cross-sectional view of the present embodiment.

  As shown in FIG. 1, the multi-blade impeller according to the present embodiment is provided between the main plate 1, the side plate 2 having the suction port 2b in the center, the main plate 1 and the side plate 2, and in the radial direction. A large number of blades 5 extending in an arc shape and a hub 3 attached to the central portion of the main plate 1 are provided.

  By rotating the multi-blade impeller configured as described above in the counterclockwise direction of the arrow, air is sucked in from the suction port 2b of the side plate 2 and blown out from the outer periphery of the blade 5 in the arrow direction.

  The main plate 1 has the same number of ridges 1a as the number of blades 5 in conformity with the shape of the blades 5 extending in an arc shape in the radial direction, and is located at the top of the protrusions 1a. The reinforcing outer peripheral portion has a plurality of locking holes provided in the radial direction, and is extruded by being extruded along the outer periphery of the main plate 1 in a direction opposite to the side plate 2 at a position avoiding the protruding portion 1a. It has a convex shape 1b, a hub 3 attached to the main plate 1, a rivet 6 that is a fixed part, and an inner peripheral stepped shape 1c molded between the convex strips 1a. FIG. 2 is an enlarged cross-sectional view of the periphery of the reinforcing outer peripheral convex shape 1b and the reinforcing outer peripheral convex shape 1b.

  The side plate 2 has the same number of protrusions 2a as the number of the blades 5 in conformity with the shape of the blades 5 extending in an arc shape in the radial direction, and has an air inlet 2b in the center portion. And a plurality of locking holes which are located at the top of the ridge 2a and are provided in the radial direction.

  The blade end portion 5a of the blade 5 is inserted into a groove formed inside the protruding strip portions 1a, 2a of the main plate 1 and the side plate 2, and a plurality of engagement portions provided at the tops of the protruding strip portions 1a, 2a. A plurality of locking protrusions 5b penetrating through the stop holes are bent and fixed to the ridges 1a and 2b. As shown in the figure, the protruding strip portion 1a of the main plate 1 and the protruding strip portion 2b of the side plate 2 reach the outer peripheries of the main plate and the side plate. In particular, the ridge portion 1a of the main plate 1 functions as a reinforcing rib that crosses the outer periphery of the main plate 1, and the ridge portions 1a and 2b are arranged at the same position as the blades 5 so that the wind due to the additional shape can be obtained. An increase in resistance can be suppressed. Further, the centrifugal force applied near the outer periphery of the blade is strong, and it is assumed that a force 6 to 7 times the wind pressure of the wind is applied. However, according to the configuration of the present embodiment, the protruding strip portion 1a of the main plate 1 reaches the outer periphery of the main plate, thereby increasing the strength between the reinforcing outer peripheral convex portion 1b and providing a stable configuration. be able to.

  In addition, according to such a configuration, after obtaining the same effect as in Japanese Patent Application Laid-Open No. 2008-95605, the main plate 1 is further rigid by the protruding strip portion 1a, the reinforcing outer peripheral convex portion 1b, and the inner peripheral stepped shape 1c. Therefore, even if the diameter of the impeller increases, the plate thickness can be reduced as much as possible, and the weight of the multi-blade impeller can be reduced.

  Further, by extruding the reinforcing outer peripheral convex shape 1b in the direction opposite to the side plate, the main plate while minimizing the shape that becomes the resistance to air flow without narrowing the flow path indicated by the arrow of air in the impeller 1 can be increased in rigidity.

  These facilitate the start and stop of the multi-blade impeller, improve the performance of products using the multi-blade impeller, and further reduce the load applied to the drive system of the multi-blade impeller as much as possible. Therefore, it is possible to improve the reliability of products using a multi-blade impeller. Further, when the rotational speed control of the multi-blade impeller is performed by the inverter, the responsiveness of the rotational speed control becomes good, and the performance of the product can be improved.

  In this embodiment, the main plate 1, the protruding strips 1a and 2a of the side plate 2, and the reinforcing outer peripheral convex shape 1b and the inner peripheral stepped shape 1c of the main plate 1 are formed by being extruded in a vertical state by press molding. The main plate 1 is a blade end of the blade 5 while maintaining high rigidity even when the diameter of the impeller is increased by the protruding strip portion 1a of the main plate 1, the reinforcing outer peripheral convex portion 1b, and the inner peripheral stepped shape 1c. The blade 5a is inserted into a groove formed by the main plate 1 and the protruding strips 1a, 2a of the side plate 2, and then the locking projection 5b of the blade 5 is bent, so that the blade end 5a of the blade 5 is a protruding portion. It is fixed in a groove constituted by 1a and 2a.

  By adopting this configuration, the diameter of the impeller can be obtained by ensuring high rigidity of the main plate 1, the side plate 2, and the blades 5 while obtaining high rigidity even when the thin plate is used. Therefore, a multi-blade impeller can be obtained that is inexpensive, lightweight, highly reliable, and can improve the responsiveness of the rotational speed control while suppressing the costs such as material costs.

  A second embodiment of the present invention will be described with reference to FIGS.

  FIG. 3 is a plan view and a cross-sectional view as seen from the main plate side of the multi-blade impeller of this embodiment.

  FIG. 4 is an enlarged view of the convex shape of the outer peripheral portion for reinforcement in the cross-sectional view of the present embodiment.

  This embodiment is a modification of the first embodiment in which the reinforcing outer peripheral convex shape 1b of the main plate 1 is added to the central axis direction of the impeller with the width of the convex shape added to the first embodiment. is there. In the configuration of FIG. 3, as an example, the reinforcing outer peripheral convex shape 1 b has a configuration in which the width is expanded to the center with the end of the main plate 1 of the inner peripheral stepped shape 1 c.

  As shown in FIG. 3, the multi-blade impeller according to the present embodiment is provided between the main plate 1, the side plate 2 having the suction port 2b in the center, the main plate 1 and the side plate 2, and in the radial direction. A large number of blades 5 extending in an arc shape and a hub 3 attached to the central portion of the main plate 1 are provided.

  By rotating the multi-blade impeller configured as described above in the counterclockwise direction, air is sucked in from the suction port 2b of the side plate 2 and blown out from the outer periphery of the blade 5 in the arrow direction.

  The main plate 1 has the same number of ridges 1a as the number of blades 5 in conformity with the shape of the blades 5 extending in an arc shape in the radial direction, and is located at the top of the protrusions 1a. 1 has a plurality of locking holes provided in the radial direction, and is further extruded along the outer periphery of the main plate 1 in the opposite direction of the side plate 2 at a position avoiding the ridges 1a. Further, the reinforcing outer peripheral convex shape 1b having a convex width expanded in the direction of the central axis of the impeller, the hub 3 attached to the main plate 1, the rivet 6 which is a fixing component, and the convex strip portion 1a It has an inner peripheral stepped shape 1c molded in between.

  The side plate 2 has the same number of protrusions 2a as the number of the blades 5 in conformity with the shape of the blades 5 extending in an arc shape in the radial direction, and has an air inlet 2b in the center portion. And a plurality of locking holes which are located at the top of the ridge 2a and are provided in the radial direction.

  The blade end portion 5a of the blade 5 is inserted into a groove formed inside the protruding strip portions 1a, 2a of the main plate 1 and the side plate 2, and a plurality of engagement portions provided at the tops of the protruding strip portions 1a, 2a. A plurality of locking protrusions 5b penetrating through the stop holes are bent and fixed to the ridges 1a and 2b. In particular, the ridge portion 1a of the main plate 1 functions as a reinforcing rib that crosses the outer periphery of the main plate 1 and also arranges the ridge portions 1a and 2b at the same position as the blades 5 so that the wind due to the additional shape can be obtained. An increase in resistance can be suppressed. Moreover, the convex strip 1a of the main plate 1 reaches the outer periphery of the main plate, so that the strength between the reinforcing outer peripheral convex portions 1b can be increased.

  Further, in this embodiment, in addition to the effects of the first embodiment, by expanding the width of the reinforcing outer peripheral convex portion 1b, not only the rigidity of the outer peripheral portion of the main plate 1 but also the inner peripheral portion of the main plate 1 is obtained. It is also possible to increase the rigidity. Therefore, even if a thin plate is used, high rigidity of the main plate 1 is secured and high fixing strength of the main plate 1, the side plate 2 and the blades 5 is obtained. A multi-blade impeller can be obtained that is inexpensive, lightweight, highly reliable, and can improve the responsiveness of the rotational speed control.

  A third embodiment of the present invention will be described with reference to FIGS.

  FIG. 5 is a diagram illustrating a configuration of attaching the first blade according to the present embodiment.

  FIG. 6 is a diagram illustrating a configuration for attaching the second blade according to the present embodiment.

  In this embodiment, an example of attachment of blades of a multi-blade impeller will be described.

  In the configuration shown in FIG. 5, the main plate 1, the convex portion 1 a, the blade 5, and the blade end 5 a are illustrated. This is an example in which the end portion 5 a of the blade 5 is sandwiched between the convex portions 1 a of the main plate 1. Thus, the reinforcement becomes stronger by sandwiching the root near the outer periphery of the blade 5 with a convex shape.

  In the configuration shown in FIG. 6, the main plate 1, the convex portion 1 a, the blade 5, and the blade end 5 a are illustrated. This is configured such that the blade end 5 a of the blade 5 penetrates between the convex portion 1 a and the convex portion 1 a of the main plate 1 and is bent so as to be in close contact with the main plate 1.

  Thus, the reinforcement is further strengthened by adopting a configuration in which the end portion of the blade passes through the main plate and is bent.

  Although the present embodiment has been described in detail above, the present invention is not limited to the embodiment of the multi-blade impeller described here, and can be easily applied to other inspection apparatuses. Needless to say.

1: Main plate 1a: Convex section 1b: Reinforcing outer peripheral section convex shape 1c: Inner peripheral stepped shape 2: Side plate 2a: Convex section 2b: Suction port 3: Hub 5: Blade 5a: Blade end 5b: Engagement Stopper piece 6: Rivet.

Claims (4)

In a multi-blade impeller comprising a main plate, a side plate having a suction port in the center, and a plurality of blades provided between the main plate and the side plate and extending in an arc shape in the radial direction,
A multi-blade impeller having a reinforcing convex shape molded at a position avoiding the fixed portion of the blade along the outer peripheral portion of the main plate. The multi-blade impeller according to claim 1,
The multi-blade impeller, wherein the reinforcing convex shape is extruded in a direction opposite to the side plate. In a multi-blade impeller comprising a main plate, a side plate having a suction port in the center, and a plurality of blades provided between the main plate and the side plate and extending in an arc shape in the radial direction,
A multi-blade impeller having a reinforcing convex shape that is located at a position avoiding the fixed portion of the blades and has a wider width from the outer peripheral portion of the main plate to the central axis direction of the main plate. The multi-blade impeller according to claim 3,
The multi-blade impeller, wherein the reinforcing convex shape is extruded in a direction opposite to the side plate.

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