JP6301106B2 - Impeller and blower equipped with it - Google Patents

Description

  The present invention relates to an impeller used for a corrosive gas blower in a chemical factory or a chemical factory, and a blower provided with the impeller.

  Conventionally, blowers are used in various factories and the like, and many blowers using impellers equipped with airfoil blades are used as efficient and low noise blowers.

  As a prior art related to this type of impeller, for example, there is a technique in which a disk and a shroud are formed of a metal material, an airfoil blade is formed of a plastic material, and these are fixed (see, for example, Patent Document 1).

  In addition, as another prior art, by dividing into a wing shape part and an airfoil shape attachment part, the optimum material (metal + nonmetal) and shape for each function can be selected, and the degree of design freedom is increased. Some have been increased (for example, see Patent Document 2).

JP-A-5-272493 JP-A-7-103190

  By the way, the factories where the impellers as described above are used include chemical factories and chemical factories. In such factories, for example, corrosive gases such as inorganic acid gases, organic acid gases, and alkali gases need to be exhausted with a blower.

  However, when the above-described prior art impeller is used in a blower that sends such a corrosive gas, the metal material is corroded in several weeks to several months, and stable operation for a long time is difficult. In addition, the impeller may be damaged by corrosion, and the exhaust of corrosive gas may stop.

  Further, when the metal material is damaged by corrosion, it is necessary to stop the blower and replace the impeller, so that much time, labor and cost are required, and productivity is reduced in the factory.

  In addition, since this type of blower may be operated for a long time (for example, 24 hours) and the number of maintenance may be limited (for example, about once every six months), it is hoped that stable operation is possible. It is rare.

  Accordingly, an object of the present invention is to provide an impeller that can be operated stably for a long time even in an environment in which a corrosive gas is sent, and a blower including the impeller.

  In order to achieve the above object, an impeller according to the present invention is an impeller attached to a drive shaft of a blower, and includes a main plate attached to the drive shaft, and a plurality of blades erected on the main plate. A body integrally formed with plastic and a side plate molded with plastic fixed to the open end of the wing, wherein the body protrudes from the open end of the wing. The side plate has a locking hole for inserting the locking pin of the wing and fixing it on the side opposite to the insertion side, and the thickness of the portion where the locking hole is provided toward the central portion is increased. Is formed. “Plastic” in this specification and claims includes fiber reinforced plastics and the like.

  With this configuration, the impeller is formed of plastic, and an impeller with high corrosion resistance can be configured. In addition, since the thickness of the side plate fixed to the locking pin of the main body is increased toward the central portion, a stable fixed state can be maintained even with aged use, and stable operation for a long time can be performed.

  In addition, a plurality of the locking pins may be provided in the blade length direction at the open end of the wing, and the outer diameter of the locking pin on the center portion side may be larger than the locking pin on the radially outer side. Good. The “size of the locking pin” in the document of this specification and the claims is a concept including either or both of “thickness” and “length”.

  If comprised in this way, the stable intensity | strength of the latching pin in the center part side to which a big pulling force will act with a centrifugal force can be maintained.

  The locking pin of the main body and the locking hole of the side plate are provided on a concentric circle, and the side plate is a plane in which the protruding side surface of the locking pin at the position of the locking hole on the concentric circle is orthogonal to the axis. It may be formed in a shape.

  If comprised in this way, the surface of the part which inserts a latching pin and protrudes from a side plate will be planar, and it can press and crimp (heat-press) from a direction parallel to an axial center, and acts on a latching pin The load to be applied can act in the axial direction of the locking pin.

  Further, the side plate may be formed such that the outer surface is formed in a stepped portion at the position of the concentric locking hole and the thickness increases toward the central portion.

  If comprised in this way, since the step part on a concentric circle is formed in the perimeter of a side plate, the side plate which is a rotary body can be formed in rotational symmetry, and a weight balance can be maintained easily. In addition, since the thickness of only the stepped portion of the locking hole formed so as to be orthogonal to the shaft center is increased, it is coupled with the locking pin while suppressing the overall weight increase by increasing the partial thickness. It is possible to keep the strength of the central portion that is present more appropriately.

  On the other hand, the blower of the present invention is a blower including any one of the impellers, and has a suction port that guides gas to a central portion of the impeller, and discharges gas from the circumferential direction of the impeller. A casing having

  With this configuration, it is possible to configure a centrifugal blower for corrosive gas that has an impeller with high corrosion resistance and is efficient and has low noise.

  According to the present invention, since the impeller formed of plastic can withstand aged use in a corrosive gas blower such as a chemical factory or a chemical factory, a long-term stable operation is possible.

FIG. 1 is a drawing showing a main body of an impeller according to an embodiment of the present invention, wherein (a) is a cross-sectional view and (b) is a plan view. 2 is a side plate fixed to the main body of FIG. 1. (a) is a plan view, (b) is a cross-sectional view, (c) is a bottom view, and (d) is an enlarged view of a portion II shown in (b). is there. 3A and 3B are drawings in a state where the main body of FIG. 1 and the side plate of FIG. 2 are fixed. FIG. 3A is a sectional view, and FIG. FIG. 4 is a cross-sectional view of a blower provided with the impeller shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, for example, in a chemical factory or the like, the peripheral speed of the outermost peripheral portion at the maximum rotation speed is about −10 ° C. to 50 ° C. or less and the maximum cutoff pressure is about 0.5 kPa to 2.5 kPa or less. An example of an impeller used at about 65 m / s will be described.

  As shown in FIGS. 1 (a) and 1 (b), a main body 10 of an impeller 1 (FIG. 3) according to this embodiment includes a disk-shaped main plate 11 and a plurality of blades 12 erected on the main plate 11. And have. The main plate 11 and the wing 12 are integrally formed. In this figure, the wings 12 are shown in the same plane for explanation.

  The main plate 11 is provided with a metal boss 13 for attachment to the drive shaft 32 (FIG. 4) at the center. Further, a cylindrical body 14 projects from the outer periphery of the boss 13 in the opposite direction to the wing 12 on the main plate 11. The cylindrical body 14 extends so as to cover the drive shaft 32 to which the boss 13 is attached when the impeller 1 is attached to the blower 30 as will be described later. The cylindrical body 14 prevents the drive shaft 32 from coming into contact with corrosive gas.

  The blade 12 has a blade shape in cross section, the blade length at the joint portion with the main plate 11 is the longest, and the blade length at the open end portion (end opposite to the main plate 11 side) 15 is the shortest. It has become. The open end 15 of the wing 12 has a curved shape so that the distance from the main plate 11 increases from the periphery toward the center. The curved shape of the open end 15 is a shape along the curved inner surface of the side plate 20 described later. In this embodiment, eight wings 12 are provided. In addition, the blade shape of this embodiment is an example, and the blade shape may be set according to the use conditions. Further, the number of blades 12 is also an example, and may be set to a preferable number according to use conditions.

  A plurality of locking pins 16 are provided at the open end 15 of the wing 12 in parallel with the axis C of the main plate 11. These locking pins 16 are provided on a concentric circle (a circle indicated by a one-dot chain line) with respect to the axis C of the main plate 11. A plurality of locking pins 16 are provided in the blade length direction at the open end 15 of the blade 12.

  In this embodiment, among the plurality of locking pins 16 provided in the blade length direction, the locking pin 16 at the centermost portion has a large diameter and is long. Further, the outer locking pin 16 is also slightly thicker and longer than the outermost locking hole 21. In this way, the locking pin 16 in the center portion is thick and long, so that the connection with the side plate 20 is firmly performed in the center portion of the wing 12. In addition, since the upper end of the long locking pin 16 is separated from the open end 15 of the wing 12, as will be described later, the thermal stress generated when the side plate 20 is fixed by heating and pressing is applied to the base of the locking pin 16. The action can be suppressed.

  Further, a back blade 17 is provided on the opposite side of the main plate 11 from the wing 12. The corrosive gas G inside the blower 30 is leaked by sucking the secondary air from the through portion of the cylindrical body 14 when the back blade 17 is attached to the drive shaft 32 of the blower 30 (FIG. 4). Is preventing.

  In such a main body 10, the wing 12 and the main plate 11 are integrally formed of fiber reinforced plastic (FRP) or the like. The boss 13 is also provided so as to be integrated when the main plate 11 is formed. Each component of the molded main body 10 is rotationally symmetric with respect to the axis C.

  FIGS. 2A to 2D are views showing a disk-shaped side plate 20 fixed to the open end 15 of the wing 12. In FIG. 2 (b), the locking hole 21 at a position displaced in the circumferential direction is shown on the same surface for explanation. As shown in FIG. 2 (b), the side plate 20 has a curved shape such that the inner side in contact with the wing 12 follows the curved shape of the open end 15 of the wing 12. The side plate 20 is provided with a locking hole 21 into which a locking pin 16 provided at the end of the wing 12 is inserted and locked. As shown in FIG. 2A, the locking hole 21 is also concentric with the axis C of the side plate 20 (the axis C of the main plate 11), like the locking pin 16 of the main body 10. Circle).

  As shown in FIG. 2 (b), the central portion of the locking hole 21 provided in the side plate 20 has a protruding side (outside) surface of the locking pin 16 at the position of the concentric locking hole 21. It is formed in a planar seat 22 that is orthogonal to the axis C. In this embodiment, the projecting side surface of the locking pin 16 at the most central portion and radially outside thereof is formed on a planar seat 22 orthogonal to the axis C. Thus, by forming the planar seat 22 on the outer surface of the side plate 20, a concentric stepped portion 25 is formed on the outer surface of the side plate 20. Thus, by providing the step part 25 which becomes the part of the seat 22 on the entire circumference, the weight balance at the time of integral molding can be maintained stably. Further, as shown in FIG. 2 (d), a recess 23 into which the crimped portion of the end of the locking pin 16 enters is formed on the outer surface side of the locking hole 21.

  Thus, the part which inserts the locking pin 16 and makes it protrude from the side plate 20 is made into the planar seat 22 orthogonal to the axial center C, and this protruding part of this locking pin 16 is from the outside. The side plate 20 can be fixed to the main body 10 by caulking in the axial direction. Therefore, the load acting on the locking pin 16 acts in the axial direction of the locking pin 16 so that an oblique load does not remain.

  Further, the side plate 20 is configured such that the thickness increases at the central portion of the portion of the locking hole 21 provided on the concentric circle. The locking hole 21 has the planar seat 22 orthogonal to the axis C as described above, and is formed so that the thickness of the portion of the seat 22 increases toward the central portion. In this embodiment, the portion of the locking hole 21 into which the locking pin 16 at the most central portion is inserted has the greatest thickness.

  In this way, it is possible to increase the coupling strength between the locking pin 16 and the locking hole 21 at the central portion where the side plate 20 and the wing 12 are coupled, and the coupling state between the wing 12 and the side plate 20 can be further increased. It can be kept properly for a long time.

  Further, as shown in FIG. 2C, a positioning rib 24 into which the open end 15 of the blade 12 enters is provided on the inner surface of the side plate 20. The open end 15 of the wing 12 enters between the positioning ribs 24, and the locking pin 16 is inserted into the locking hole 21. The side plate 20 is also integrally formed of fiber reinforced plastic (FRP) or the like. Each component of the molded side plate 20 is rotationally symmetric with respect to the axis C.

  FIG. 3 shows a state in which the side plate 20 is fixed to the main body 10. As shown in the drawing, the locking hole 16 of the side plate 20 is inserted into the locking pin 16 provided at the open end 15 of the wing 12, and the tip portion of the locking pin 16 is crimped (heated and pressed) from the outside. Thus, the distal end portion of the locking pin 16 fills the concave portion 23 of the locking hole 21 and the side plate 20 is fixed to the main body 10. Since the main body 10 and the side plate 20 fixed in this way are rotationally symmetric with respect to the axis C, for example, the peripheral speed at the outermost peripheral part is operated for a long time at a high speed of about 65 m / s. It can be used stably for a long time even under various usage conditions. In addition, this impeller 1 is suitable when, for example, the peripheral speed at the outermost peripheral portion of the rated rotational speed is used at a high speed of 30 m / s to 65 m / s.

  Further, as described above, the locking pin 16 protruding from the locking hole 21 of the side plate 20 is pressed in the axial direction in order to press perpendicularly to the seat 22 provided with the locking hole 21 of the side plate 20. It can be pressed and fixed to the recess 23 of the seat 22. Moreover, since the locking pin 16 is pressed in the axial direction, it is possible to prevent an oblique force from remaining on the locking pin 16 after being fixed.

  Furthermore, in this embodiment, the outer diameter of the locking pin 16 at the most central portion of the side plate 20 is formed thick, and the locking hole 21 at the central portion for fixing the locking pin 16 has a seat with an increased thickness. Therefore, the central part of the side plate 20 can be more firmly fixed. As a result, a centrifugal force acts on the side plate 20 during rotation, and a large pulling force that acts to spread outward acts on the central portion of the side plate 20 formed in the arc-shaped cross section by the centrifugal force. The force can be supported by the locking hole 21 of the thick step portion 25 and the thick locking pin 16.

  In this way, by fixing the side plate 20 to the main body 10, the plastic impeller 1 in which the main body 10 and the side plate 20 are integrated is formed. Since the impeller 1 is made of plastic except for the bosses 13, the impeller 1 has high corrosion resistance. The impeller 1 can flow gas from the central portion of the side plate 20 to the periphery of the blade 12 by the peripheral blade 12 by rotating and driving the boss 13 provided in the central portion of the main plate 11 in one direction.

  FIG. 4 shows an example in which the impeller 1 is provided in the centrifugal blower 30. In the impeller 1, the boss 13 is attached to a drive shaft 32 that is rotationally driven by a belt 31 that is driven by a drive motor by a nut 33. A cover 34 is attached to the tip of the nut 33 and the drive shaft 32 so as to protect them from the corrosive gas G. The impeller 1 is housed in a casing 35 provided around the impeller 1. The casing 35 is provided with a trumpet-shaped cylindrical body 36 that guides gas toward the side plate 20 of the impeller 1. The flanges 37 and 38 of the casing 35 are provided with a suction pipe (suction port) 39 for sucking the corrosive gas G in the central portion of the impeller 1, and a discharge pipe for discharging the corrosive gas G from the circumferential direction of the impeller 1. 40 (discharge port) is attached.

  According to such a centrifugal blower 30, the corrosive gas G sucked from the suction pipe 39 is discharged from the periphery of the impeller 1 to the discharge pipe 40 by rotating the impeller 1 by the drive shaft 32. In this embodiment, the centrifugal blower 30 has been described as an example, but another blower may be used.

  As described above, according to the impeller 1, the main body 10 and the side plate 20 are integrally formed of plastic (fiber reinforced plastic), and the locking pins 16 provided on the wings 12 of the main body 10 are connected to the locking holes of the side plate 20. The integrated impeller 1 can be formed by inserting and fixing to 21. Moreover, since the entire impeller 1 is made of plastic, even if it is used for the corrosive gas blower 30, stable operation for a long time is possible.

  Therefore, according to the blower 30 using the impeller 1, it is possible to provide a blower 30 that can be stably operated in a corrosive gas even in equipment with a long maintenance period, and can be stably operated. Become.

  In the above embodiment, a corrosive gas blower in a chemical factory, a chemical factory, or the like has been described as an example, but in addition, a draft fan for a chemical laboratory that handles various types of gas bodies, a bio, IC laboratory It can be used as the impeller 1 in various blowers such as a blower, a toilet, a bathroom exhaust blower, a kitchen equipment blower, and a septic tank equipment odor blower. The use of the impeller is not limited to the above embodiment.

  In addition, the operating conditions of the impeller 1 are also stable operation even if it is used for a long period of time, for example, in an environment where the maximum pressure is about −10 to 50 ° C. and the maximum cutoff pressure is about 0.5 to 2.5 kPa. However, the present invention is not limited to the above embodiment.

  Furthermore, the said embodiment has shown an example, The various change in the range which does not impair the summary of this invention is possible, and this invention is not limited to the said embodiment.

  The impeller according to the present invention can be used as a corrosive gas blower in chemical factories, chemical factories, chemical laboratories, biotechnology, IC laboratories and the like.

DESCRIPTION OF SYMBOLS 1 Impeller 10 Main body 11 Main plate 12 Wing 13 Boss 14 Cylindrical body 15 Open end 16 Locking pin 17 Back blade 20 Side plate 21 Locking hole 22 Seat 23 Concave 30 Blower 31 Drive motor 32 Drive shaft 35 Casing

Claims (5)

An impeller attached to a drive shaft of a blower,
A main plate that is attached to the drive shaft, and a plurality of wings that are erected on the main plate, and a body that is integrally formed of plastic,
A side plate formed of plastic fixed to the open end of the wing, and
The main body has a plurality of locking pins projecting in parallel with the axis of the main body from the open end of the wing toward the central portion from the outer peripheral side of the main body,
The side plate from an outer peripheral side of the side plate toward the central portion, have a plurality of locking holes for fixing by inserting the locking pin of the wing at the anti-insertion side,
The locking hole may impeller axial thickness of the portion of the engagement Tomeana, characterized in that it is formed to increase Suyo toward the center portion from the outer peripheral side of the side plate.   The locking pin is provided with a plurality of locking pins in the blade length direction at the open end of the blade, and the outer diameter of the locking pin on the center portion side is larger than the locking pin on the radially outer side. The impeller described in 1. The locking pin of the main body and the locking hole of the side plate are provided concentrically,
The impeller according to claim 1 or 2, wherein the side plate is formed such that a protruding side surface of a locking pin at a position of a locking hole on a concentric circle is formed in a plane shape orthogonal to the axis.   4. The impeller according to claim 3, wherein the side plate is formed such that an outer surface is formed in a stepped portion at a position of a concentric locking hole and the thickness increases toward a central portion. A blower comprising the impeller according to any one of claims 1 to 4,
A blower comprising a casing having a suction port for introducing gas to a central portion of the impeller and having a discharge port for discharging gas from the circumferential direction of the impeller.

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