JP2017082607A - Centrifugal fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centrifugal fan capable of improving its alignment accuracy by actualizing easy alignment during mounting itself on a device or equipment.SOLUTION: A centrifugal fan 1 having an impeller 8 stored inside a casing exhausts air sucked from a suction port 35 with the rotation of the impeller 8, from a blowout port 36 toward the outer side of the casing 2. At the peripheral edge of the suction port 35 formed in the casing 2, an annular projection 3b is formed projecting upward in the axial direction. The annular projection 3b projects axially upward of the upper face of the casing 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a centrifugal fan.

  Centrifugal fans are known as blowers that are widely used for cooling, ventilation, and air conditioning of home appliances, OA equipment, and industrial equipment, air conditioning for vehicles, and ventilation. As a conventional centrifugal fan, the casing consists of an upper casing and a lower casing. An impeller is accommodated between the upper casing and the lower casing, and the air sucked from the suction port as the impeller rotates is placed between the upper casing and the lower casing. There is known a centrifugal fan that discharges outward from a blow-out port formed on the side surface of the door (see, for example, Patent Document 1). FIG. 4 shows a centrifugal fan 100 described in Patent Document 1, in which a rectangular casing 120 includes an upper casing 121 and a lower casing 122, and an impeller 130 is accommodated between the upper casing 121 and the lower casing 122. The impeller 130 includes an annular shroud 131. Due to the high speed rotation of the impeller 130, the air sucked from the suction port 110 passes between the blades 135 and is blown outward from the outer periphery of the impeller 130, and is formed on the side surface between the upper casing 121 and the lower casing 122. The air is discharged outward from the outlet 111.

JP2012-207600A

  Regarding the structure for attaching the centrifugal fan described in Patent Document 1 to the housing of another device or device, Patent Document 1 does not describe the specific structure. In this type of fan, usually, a plurality of flanges extending radially outward are formed in the upper casing, and bolts, screws, etc. are inserted into through holes formed in the flange, so that the fan is a housing of an apparatus or device. A structure to be fastened to is adopted. However, when the positioning accuracy of the centrifugal fan is required, the positioning operation is not easy and high-precision positioning is not easy only with a structure in which a bolt, a screw, or the like is inserted and fastened to the housing of the apparatus or device.

  In the background as described above, an object of the present invention is to provide a centrifugal fan that can be easily aligned at the time of attachment to an apparatus or equipment and can improve positioning accuracy.

  The invention according to claim 1 is a centrifugal fan in which an impeller is housed in a casing, and the air sucked from the suction port as the impeller rotates is discharged from the outlet toward the outside of the casing. The centrifugal fan is characterized in that an annular projection protruding upward in the axial direction is formed at the periphery of the suction port formed in the casing, and the annular projection protrudes upward in the axial direction from the upper surface of the casing. It is.

  According to a second aspect of the present invention, in the first aspect of the present invention, an annular groove is formed on the lower surface of the annular protrusion of the casing, and the annular protrusion is a part of a member constituting the impeller. An annular protrusion formed on the shroud is located in the groove.

  The invention according to claim 3 is the invention according to claim 2, wherein a labyrinth seal structure is formed between the annular groove and the annular protrusion formed in the annular shroud. It is characterized by.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, the annular protrusion formed on the annular shroud is formed at an axial upper end of the annular shroud. .

  According to a fifth aspect of the present invention, in the second aspect of the present invention, the annular protrusion formed on the annular shroud is formed on either a step on the upper surface of the annular shroud or an inclined surface. It is characterized by being.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the casing includes an upper casing and a lower casing, and is interposed between the upper casing and the lower casing. The blowout port is formed on a side surface of the casing and between the support columns.

  ADVANTAGE OF THE INVENTION According to this invention, the centrifugal fan which can perform the positioning at the time of attachment to an apparatus or an apparatus easily, and can improve positioning accuracy is obtained.

It is a disassembled perspective view of the centrifugal fan of embodiment. It is sectional drawing of the centrifugal fan shown in FIG. It is the elements on larger scale of the centrifugal fan shown in FIG. It is a figure which shows the conventional centrifugal fan.

(1) Structure of Centrifugal Fan FIG. 1 is an exploded perspective view of a centrifugal fan according to an embodiment. FIG. 2 is a cross-sectional view of the centrifugal fan shown in FIG. FIG. 3 is a partially enlarged view of the centrifugal fan shown in FIG. FIG. 2 shows the centrifugal fan 1 of the embodiment. The basic structure of the centrifugal fan 1 is substantially the same as the structure described in Patent Document 1 and includes a casing 2. The casing 2 includes an upper casing 3 and a lower casing 4, and an impeller 8 (see FIG. 1) is accommodated between the upper casing 3 and the lower casing 4.

  The air sucked from the suction port 35 with the rotation of the impeller 8 passes between the blades 10 and is formed on the side surface excluding the column 7 interposed between the upper casing 3 and the lower casing 4. It is discharged from 36 toward the outside of the casing 2 (outward direction of the diameter). The impeller 8 is driven to rotate by a motor 21 which is an outer rotor type brushless DC motor. The motor 21 is mounted on the bottom surface of the recess 5 a formed in the motor base 5.

  As shown in FIG. 3, the motor 21 includes a stator 22. The stator 22 includes a stator core 23 formed by laminating a predetermined number of thin plate cores, an insulator 24 including an upper insulator 24 a and a lower insulator 24 b mounted from both axial sides of the stator core 23, and the stator core 23 via the insulator 24. The coil 25 is wound around the teeth.

  The thin plate-shaped core constituting the stator core 23 includes a plurality of teeth (having six teeth in FIG. 3) extending radially outward from the annular yoke. A bearing holding portion 26 is fitted in an opening formed in the center of the stator core 23, and the stator 22 is disposed outside the bearing holding portion 26. Bearings 27 and 28 are mounted inside the bearing holding portion 26, and the shaft 16 is rotatably supported. The circuit board 30 is mounted on the lower insulator 24b, and the circuit board 30 is accommodated in the recess 5a.

  The rotor 15 includes a shaft 16, a boss 17 portion attached to the shaft 16, a cup-shaped rotor yoke 18 attached to the boss portion 17, and an annular magnet 19 fixed to the inside of the rotor yoke 18. ing. The rotor yoke 18 is caulked and fixed to the boss portion 17.

  An impeller 8 is coupled to the outer periphery of the rotor yoke 18 using a flange 20. As shown in FIG. 1, the impeller 8 includes an annular shroud 9, a plurality of blades 10, and a disk-shaped main plate 11. The blades 10 and the main plate 11 are formed by integral molding of resin. Yes. The blade 10 is erected from the main plate 11 in the axial direction, has a shape that is curved and inclined backward with respect to the rotation direction, and is a backward blade (so-called turbo type) with respect to the rotation direction. All the blades 10 have the same shape. The blade 10 and the annular shroud 9 are joined by ultrasonic welding.

  The upper surface of the annular shroud 9 has two step portions, each step portion is a flat surface, an inclined surface is formed between each step portion, and an annular protrusion 9 a is formed at the axial upper end of the annular shroud 9. Is formed. When the blade 10 and the annular shroud 9 are joined by ultrasonic welding by the flat surface of the step portion, the electrodes of the ultrasonic welding machine are easily applied. The top of the annular projection 9 a formed at the upper end in the axial direction of the annular shroud 9 is located in an annular recess (groove) 3 c formed on the lower surface of the upper casing 3 and is covered with the upper casing 3. .

  The main plate 11 of the impeller 8 has an inclined surface 11a between the inner peripheral side and the outer peripheral side. That is, the inner peripheral side of the impeller 8 is positioned upward in the axial direction, the outer peripheral side of the impeller 8 is positioned lower in the axial direction, and the inclined surface 11a is provided between the inner peripheral side and the outer peripheral side.

  The impeller 8 and the rotor 15 are coupled as follows. First, the annular flange 20 is welded to the outer peripheral surface of the rotor yoke 18 by, for example, resistance welding. Next, the main plate 11 is fixed to the flange 20. A pin (not shown) formed by integral molding is formed on the lower surface on the inner peripheral side of the flange 20, and this pin is fitted into a through hole formed in the flange 20, and the tip of the pin is crushed by heat. The main plate 11 is fixed to the flange 20 by heat caulking. Thus, the impeller 8 is mounted on the rotor 15.

  An opening serving as a suction port 35 is formed at the center of the upper casing 3, and an annular protrusion 3 b protruding upward in the axial direction is formed at the periphery of the opening, on the outer peripheral side of the annular protrusion 3 b. A plurality of recesses 3a (meat stealing portions) are formed on the upper surface side of the upper casing 3, and a plurality of ribs are formed radially between the recesses 3a (see FIG. 1). The upper casing 3 and the lower casing 4 are coupled by interposing a support 7 between the upper casing 3 and the lower casing 4 and fastening the support 7 with a fastening material such as a screw. Specifically, the support column 7 is formed by integrally molding the upper casing 3 and the resin, and the support column 7 is formed with a lower hole. And the support | pillar 7 is penetrated to the through-hole 6d (refer FIG. 1) of the lower casing 4 (base plate 6), and the upper casing 3 is screwed in the said lower hole of the support | pillar 7 through the through-hole 5d. And the lower casing 4 are connected. In addition, a fastening means is not limited to this, For example, the structure which inserts a screw (or volt | bolt) from the lower casing 4 side to the through-hole of the support | pillar 7, and fixes with a nut from the upper casing 3 side may be sufficient.

  The lower casing 4 includes a motor base 5 made of metal (for example, an iron plate) and a base plate 6 made of resin, and the lower casing 4 is formed by superimposing both. The motor 21 is mounted on the bottom surface of the recess 5 a formed in the motor base 5. Side portions 6a (see FIG. 1) extending downward are formed at four locations on the outer peripheral edge of the base plate 6, and the inside of the side portion 6a abuts on the outer periphery of the four sides of the motor base 5 for positioning. Has been.

  On the circuit board 30, components for driving and controlling the motor 21 and electronic components 31 such as a control IC are mounted. Here, in order to prevent contact between the electronic component 31 mounted on the circuit board 30 and the impeller 8 in a limited space, the main plate 11 is formed with an inclined surface 11a, and the inclined surface 11a is located at the position of the inclined surface 11a. A part of the electronic component 31 is accommodated. For this reason, the contact between the electronic component 31 and the impeller 8 can be prevented, and the axial thickness can be reduced.

(2) Features An opening serving as a suction port 35 is formed at the center of the upper casing 3, and an annular protrusion 3b protruding upward in the axial direction is formed at the periphery of the opening. Projecting upward from the upper surface of the upper casing 3. When the centrifugal fan 1 is attached to the housing of another device or apparatus, the annular projection 3b is fitted as an inlay to facilitate positioning when attaching to the apparatus or device, thereby improving positioning accuracy. . In addition, the size of the opening formed in the housing does not need to take into account variations when the centrifugal fan 1 is attached.

  An annular recess (groove) 3 c is formed on the lower surface of the annular protrusion 3 b of the upper casing 3, and the top of the annular protrusion 9 a formed at the axial upper end of the annular shroud 9 is the lower surface of the upper casing 3. It is located in an annular recess (groove) 3c formed in. In this structure, the annular protrusion 9 a is covered with the upper casing 3. And the labyrinth seal structure is comprised by the clearance gap formed between the side surface of the projection part 9a of the cyclic | annular shroud 9, and the upper casing 3. FIG. This labyrinth structure prevents a part of the air blown out from the outer periphery of the impeller from flowing backward in the direction of the suction port 35.

  Moreover, although the labyrinth structure is comprised in the lower surface of the cyclic | annular projection part 3b of the upper casing 3, in order to use the cyclic | annular projection part 3b of the upper casing 3 as an inlay at the time of attachment to an apparatus or an apparatus, an annular | circular projection part 3b is located in an apparatus or equipment. For this reason, the axial height of the centrifugal fan 1 is substantially the height up to the upper surface of the upper casing 3, and the effective height can be lowered.

  The width in the radial direction of the annular protrusion 3b is not particularly limited, and the width is a step located on the suction port 35 side formed on the upper surface of the annular shroud 9, or between two steps. It may have up to the position of the inclined surface formed.

  The protrusion 9a of the annular shroud 9 is formed at the upper end in the axial direction, but is not limited to this, and is formed on a step located on the suction port 35 side or formed between two steps. You may form in the position of the made inclined surface.

  An annular recess (groove) 3c formed in the lower surface of the projection 3b of the upper casing 3 is formed at a position corresponding to the annular projection 9a formed in the annular shroud 9, and the annular projection 9a The top is located in the annular recess (groove) 3c.

  In addition to using the annular protrusion 3b as an inlay, this annular protrusion 3b may be used as a location for attaching another member (for example, a cover or the like) or may be used for positioning.

  DESCRIPTION OF SYMBOLS 1 ... Centrifugal fan, 2 ... Casing, 3 ... Upper casing, 3a ... Recessed part, 3b ... Ring-shaped projection part, 3c ... Ring-shaped recessed part, 4 ... Lower casing, 5 ... Motor base, 5a ... Recessed part, 5d ... Through-hole, 6 DESCRIPTION OF SYMBOLS ... Base plate, 6a ... Side part, 6d ... Through-hole, 7 ... Post, 8 ... Impeller, 9 ... Shroud, 9a ... Projection part, 10 ... Blade, 11 ... Main plate, 11a ... Inclined surface, 15 ... Rotor, 16 ... Shaft , 17 ... Boss part, 18 ... Rotor yoke, 19 ... Magnet, 20 ... Flange, 21 ... Motor, 22 ... Stator, 23 ... Stator core, 24 ... Insulator, 24a ... Upper insulator, 24b ... Lower insulator, 25 ... Coil, 26 ... Bearing holding part, 27 ... bearing, 28 ... bearing, 30 ... circuit board, 31 ... electronic component, 35 ... suction port, 36 ... blowout port.

Claims (6)

In the centrifugal fan that stores the impeller inside the casing and discharges the air sucked from the suction port as the impeller rotates toward the outside of the casing from the blowout port,
An annular protrusion that protrudes upward in the axial direction is formed on the periphery of the suction port formed in the casing,
The centrifugal fan, wherein the annular protrusion protrudes axially upward from the upper surface of the casing. An annular groove is formed on the lower surface of the annular protrusion of the casing,
The centrifugal fan according to claim 1, wherein an annular protrusion formed on an annular shroud that is a part of a member constituting the impeller is located in the groove.   The centrifugal fan according to claim 2, wherein a labyrinth seal structure is formed between the annular groove and the annular protrusion formed on the annular shroud.   The centrifugal fan according to claim 2, wherein the annular protrusion formed on the annular shroud is formed at an upper end in the axial direction of the annular shroud.   The centrifugal fan according to claim 2, wherein the annular protrusion formed on the annular shroud is formed on either a stepped portion or an inclined surface of the upper surface of the annular shroud.   The casing includes an upper casing and a lower casing, and includes a support column interposed between the upper casing and the lower casing. The casing is a side surface of the casing, and the outlet is formed between the support columns. The centrifugal fan according to claim 1, wherein the centrifugal fan is provided.

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