JPH0587091A - Blower - Google Patents

Abstract

PURPOSE:To provide a blower which is not deformed when used at high temperatures or with high rotational frequencies and generates few vibrations and little noises. CONSTITUTION:A reinforcing ring of resin 19 is fitted on the outer peripheral face of a fan 4 having blade pieces 17 disposed like a cylinder. The reinforcing ring 19 is fitted on the outer peripheral face of the fan 4 and a balance weight is provided on the outer peripheral face of the reinforcing ring 19. Each blade piece 17 is retained while inclined so that its tip part is located close to the rotational direction R of the fan 4 and an air intake 20 is provided in that part of a fan case 5 which is almost aligned with the inner peripheral face of the fan 4. The air intake is formed at a stepped opening having a inclined face 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower which is mounted inside a copying machine or the like and is used for discharging toner or ozone generated inside the copying machine or sucking copying paper.

[0002]

2. Description of the Related Art Generally, a high-power blower having a resin sirocco fan is provided inside a copying machine in order to discharge toner and ozone generated by copying or to suck copy paper.

FIG. 6 shows a conventional blower with a part cut away. This conventional blower 31 has a brushless motor 32 as a drive source, a sirocco fan 34 fixed to the tip of a rotating shaft 33 of the brushless motor 32, and a spiral fan case 35 surrounding the sirocco fan 34. is doing. The sirocco fan 34 is integrally formed of resin and has a large number of blade pieces 3 arranged in a cylindrical shape.
Have eight. The sirocco fan 34 is fixed to the tip end of the rotary shaft 33 of the brushless motor 32 coaxially with the rotary shaft 33. Each blade piece 38 of the sirocco fan 34 is supported parallel to the rotation axis of the sirocco fan. A fan case 35 having a spiral shape surrounding the outer periphery of the sirocco fan 34 is fixed to the fan case bottom plate 35a which also serves as a fixing member of the motor.

FIG. 7 shows the upper surface of the blower 31.
The blade pieces 38 of the sirocco fan 31 each have a curved blade cross section. As shown in FIG. 7, the blade pieces 38 are held so that the blade cross sections are arranged in a spiral shape. On the other hand, as shown in FIG. 7, the fan case 35 has a spiral shape and surrounds the outer periphery of the sirocco fan 34. The fan case 35 has an intake port 39 at a position substantially aligned with the inner peripheral surface of the sirocco fan 34.

8 and 9 show only the sirocco fan 34. As shown in the figure, the sirocco fan 34 has a fitting cylinder 40 that fits with the rotating shaft 33 at the center.
A disc-shaped hub 41 is provided on the outer peripheral surface of the fitting cylinder 40. A large number of blade pieces 38 are erected on the peripheral portion of the hub 41. The tip portion of the blade piece 38 is formed integrally with the common holding ring 42. The blade 38 is held by the holding ring 42 so as to maintain the cylindrical shape.

In the blower 31, the sirocco fan 34
When driven by the brushless motor in the direction r, the centrifugal force generated by the blade pieces 38 causes air to be taken in through the air intake ports 39 as shown in the figure, passing between the blade pieces 38, and passing through the fan case 35. Flows through the inner flow path as indicated by arrow w in the figure.

[0007]

However, since the above-mentioned conventional blower is usually used in a high temperature environment inside the copying machine and is rotated at a high speed to generate a large air volume, the blade piece is large. There is a problem in that it is subjected to centrifugal force and is deformed by high temperature to generate vibration. Further, in the above conventional blower, the deformation of the sirocco fan becomes large,
The entire sirocco fan was sometimes damaged. Even when the sirocco fan is not deformed, the noise and vibration generated by the blower increase in proportion to the basic frequency determined by the number of blade pieces x the number of revolutions / 60, and the sirocco fan rotates at high speed. There was a problem that noise and vibration became significantly louder when doing. Therefore, an object of the present invention is to provide a blower that does not deform under use conditions of high temperature and high rotation, and that has less vibration and noise.

[0008]

In order to achieve the above object, the blower of the present invention is a fan made of resin in which a large number of blade pieces are arranged in a cylindrical shape at the tip of the rotary shaft of a motor, coaxial with the rotary shaft. And a resin-made reinforcing ring for holding the blade piece is fitted to the outer peripheral surface of the fan.

Further, in the blower of the present invention, a resin fan having a large number of blade pieces arranged in a cylindrical shape is fixed coaxially with the rotary shaft at the tip of the rotary shaft of the motor. A reinforcing ring made of resin for holding the blade piece is fitted, and a balance weight for canceling the vibration of the motor is provided on the outer peripheral surface of the reinforcing ring.

Further, in the blower of the present invention, a resin fan having a large number of blade pieces arranged in a cylindrical shape is coaxially fixed to the tip of the rotary shaft of the motor, and the tip of the blade piece is It is characterized in that each blade piece is held so as to be inclined so as to be located closer to the rotation direction of the fan.

Further, in the blower of the present invention, the blade tips of the blades of the fan are held so as to be inclined so that they are located closer to the rotation direction of the fan, and the fan case bottom plate also serving as a fixing member for the motor is provided with An air intake is provided in a portion substantially aligned with the inner peripheral surface of the fan, and a spiral fan case surrounding the outer periphery of the fan is fixed, and the air intake is formed into a stepped opening having an inclined surface. It is characterized by being formed.

[0012]

In the blower of the present invention in which a resin-made reinforcing ring is fitted on the outer peripheral surface of the fan, since the resin-made reinforcing ring is fitted on the outer peripheral surface of the fan, the outer peripheral surface and the inner peripheral surface of the fan are The circularity of the fan can be maintained, and fan deformation due to centrifugal force due to heat and high rotation can be prevented, and noise, vibration, and damage due to fan deformation can be prevented.

Further, in the blower of the present invention in which a reinforcing ring is fitted on the outer peripheral surface of the fan and a balance weight is provided on the outer peripheral surface of the reinforcing ring, vibrations peculiar to the motor can be obtained by appropriately adjusting the balance weight. In addition to canceling, the deformation of the fan can be prevented by the reinforcing ring as described above. As a result, it is possible to provide a blower that can be operated for a long time in a severe operating environment with low vibration and low noise and that prevents the deformation of the fan.

Further, in the blower of the present invention in which the blade pieces are inclined and held so that the tip end portions of the blade pieces are located closer to the rotation direction of the fan, the length of each blade piece becomes longer, The amount of air blown per piece increases. That is, the fan can be rotated at a low rotational speed for a predetermined air flow rate. In this case, since the basic frequency determined by the number of blade pieces × rotation number ÷ 60 becomes small, the noise and vibration generated by the entire blower become proportionally small.

Further, each blade piece is held so as to be inclined so that the tip end portion of the blade piece is located closer to the rotation direction of the fan, and an air intake port is provided in a portion of the fan case that is substantially aligned with the inner peripheral surface of the fan. The blower of the present invention, which is provided with the air intake port formed in the stepped opening having the inclined surface, has a large air flow rate per blade piece, and can obtain a predetermined air flow rate at low rotation. At the same time, since the air intake is formed as a stepped opening having an inclined surface,
There is little turbulent flow near the air intake port when inhaling air, and noise and vibration during air inhalation can be reduced.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a blower according to an embodiment of the present invention with a part cut away. The blower 1 has a brushless motor 2 as a drive source, a sirocco fan 4 fixed to the tip of a rotating shaft 3 of the brushless motor 2, and a spiral fan case 5 surrounding the sirocco fan 4. The brushless motor 2 is composed of a stator 6, a rotor 7, and the rotating shaft 3. The stator 6 of the brushless motor 2 is composed of a stator coil 8 in which a coil is wound around an iron core, a bracket 9 that holds the stator coil 8, and a circuit board 10 attached to the bracket 9. The rotor 7 is
The magnet 11 is arranged to face the outer peripheral surface of the stator coil 8, and a cylindrical arm member 12 having one end surface for holding the magnet 11. The rotating shaft 3 is an arm member 1 of the rotor 7.
It is fixed to 2 and is rotatably held by a bracket 9 via ball bearings 13 and 14. The bracket 9 of the stator 6 is fixed to a fan case bottom plate 5a of a sirocco fan that also serves as a fixing member of the brushless motor 2. The sirocco fan 4 is integrally formed of resin, and the rotary shaft 3 of the brushless motor 2 is provided at the center thereof.
It has a fitting cylinder 15 for fitting with. A disc-shaped hub 16 is formed at the base of the fitting cylinder 15. A large number of blade pieces 17 are erected on the peripheral portion of the disk-shaped hub 16. The upper end of the blade piece 17 is formed integrally with the common retaining ring 18. A reinforcing ring 19 is provided on the outer peripheral surface of the sirocco fan 4 near the holding ring 18.
Is fitted.

2 and 3 show only the sirocco fan 4. Of these, FIG. 2 shows the side surface of the sirocco fan 4, and FIG. 3 shows the upper surface of the sirocco fan 4. As shown in FIG. 3, the sirocco fan 4 has a fitting tube 1 at the center.
5, a disc-shaped hub 16 is provided on the outer peripheral surface of the base of the fitting cylinder 15. A large number of the blade pieces 17 are erected on the peripheral portion of the hub 16. Each blade piece 17 has a curved cross section, and the blade pieces 17 are provided so that the blade cross sections are arranged in a spiral shape. The tip of the blade piece 17 is formed integrally with the common holding ring 18. A reinforcing ring 19 is fitted on the outer peripheral surface of the sirocco fan 4 near the holding ring 18. This reinforcing ring 19 has a plurality of fixing claws 1.
9 a, and these claws 19 a are fixed by engaging with the retaining ring 18. The reinforcing ring 1
A plurality of balance weights 19 a are attached to the outer peripheral surface of 9.

According to this embodiment, since the reinforcing ring 19 is fitted on the outer peripheral surface of the sirocco fan 4, the strength of the sirocco fan 4 is increased, especially when the blade piece 17 receives a centrifugal force at a high rotation speed. However, the sirocco fan 4 is not deformed. Further, the sirocco fan 4 is not deformed by heat even under a high-temperature use condition inside the copying machine. As a result, vibration and noise of the sirocco fan 4 due to the deformation are prevented, and the blower 1 is largely deformed.
Can be prevented from being damaged. Further, by properly adjusting the balance weight 19a, the vibration peculiar to the brushless motor 2 can be canceled out, and the noise and vibration caused by the brushless motor 2 can be reduced.

FIG. 4 shows a Sorocco fan blower according to another embodiment of the present invention partially cut away. In FIG. 4, in which the same parts as those in FIG.
The blade piece 17a is provided so as to be inclined such that the tip end thereof is located closer to the rotation direction R of the sirocco fan 4. The fan case 5 has an air intake port 20 at a position substantially aligned with the inner peripheral surface of the sirocco fan. As shown in FIG. 4, the air intake port 20 is formed as a stepped opening having an inclined surface 21.

FIG. 5 shows the upper surface of the blower. The blade pieces 17a of the sirocco fan 4 are provided so that the blade cross sections are arranged in a spiral shape. As shown in FIG. 5, the fan case 5 has a spiral shape, surrounds the outer periphery of the sirocco fan 4, and forms an air flow path whose cross-section gradually increases. An air intake port 20 is formed on the upper surface of the fan case 5 at a position substantially aligned with the inner peripheral surface of the sirocco fan. This air intake 20
Are formed in a stepped opening having an inclined surface 21.

The operation of the blower 1 according to this embodiment will be described below. During operation, the sirocco fan 4 is rotationally driven in the direction R shown in FIG. Due to the centrifugal force generated by the blade piece 17a of the sirocco fan 4, air flows in from the air intake port 20 and passes between the blade pieces 17a as shown by an arrow W in FIGS. Flows in the air passage whose inner cross section gradually increases. At this time, since the air intake port 20 of the present embodiment is formed as a stepped opening having the inclined surface 21, the turbulent flow near the air intake port 20 that occurs during the intake of air is small. This makes it possible to obtain an efficient blower 1 with less noise when sucking air.
Further, since the blade piece 17a according to the present embodiment is provided so as to be inclined, the blade piece 1 provided parallel to the rotating shaft 3
It has a large blade area compared to 7. Due to the large blade area of the blade piece 17a, a large amount of air can be obtained with a small number of rotations. In general, the noise and vibration generated by the blower as a whole increase in proportion to the basic frequency determined by the number of blade pieces × rotation number ÷ 60, so that the blower 1 according to the present embodiment can blow a predetermined amount of air with a small number of rotations. Generates less noise and vibration.

In the above description, two embodiments having different configurations have been described for easy understanding, but the present invention can obtain respective effects by arbitrarily combining the configurations of these embodiments. it is obvious.

[0023]

As is apparent from the above description, according to the blower of the present invention in which the outer peripheral surface of the fan is fitted with the resin reinforcing ring, the outer peripheral surface of the fan is fitted with the resin reinforcing ring. Therefore, it is possible to obtain a blower that prevents deformation of the fan due to heat or centrifugal force due to high rotation, and prevents noise and vibration due to deformation of the fan, or damage to the fan itself.

Further, according to the blower of the present invention in which the reinforcing ring is fitted on the outer peripheral surface of the fan, and the balance weight is provided on the outer peripheral surface of the reinforcing ring, the balance weight is appropriately adjusted to make the motor unique to the motor. It is possible to obtain a blower which can be operated for a long time in a severe operating environment with a low vibration and a low noise while canceling the vibration of the fan and preventing the deformation of the fan by the reinforcing ring.

Further, according to the blower of the present invention in which the blade pieces are inclined and held so that the tips of the blade pieces are located closer to the rotation direction of the fan, the length of each blade piece becomes longer, and By increasing the amount of air blown per piece, it is possible to blow a predetermined amount of air at low rotation speed,
It is possible to obtain a blower with low vibration and noise based on the fundamental frequency determined by the number of blade pieces × rotation number ÷ 60.

Further, each blade piece is held so as to be inclined so that the tip end portion of the blade piece is located closer to the rotation direction of the fan, and an air intake port is provided in a portion of the fan case substantially aligned with the inner peripheral surface of the fan. According to the blower of the present invention in which the air intake port is provided in the stepped opening having the inclined surface, it is possible to blow a predetermined amount of air at a low rotation speed, and at the same time, to take in air when sucking air. It is possible to obtain a blower that is efficient with less turbulent flow generated near the inlet and has less noise and vibration.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a blower according to the present invention by cutting a part thereof.

FIG. 2 is a side view showing a sirocco fan of the blower of the present invention.

FIG. 3 is a plan view showing a sirocco fan of the blower of the present invention.

FIG. 4 is a side sectional view showing a blower according to another embodiment of the present invention with a part thereof cut away.

FIG. 5 is a plan view of a blower according to another embodiment of the present invention.

FIG. 6 is a side sectional view showing a part of a conventional blower by cutting it.

FIG. 7 is a plan view showing a conventional blower.

FIG. 8 is a side view showing a sirocco fan of a conventional blower.

FIG. 9 is a plan view showing a sirocco fan of a conventional blower.

[Explanation of Codes] 1 Blower 2 Brushless motor 3 Rotating shaft 4 Sirocco fan 5 Fan case 5a Fan case bottom plate 17 Blade piece 17a Blade piece 19 Reinforcement ring 19a Balance weight 20 Air intake port 21 Air intake port inclined surface

Claims (4)

[Claims] 1. A resin-made fan, in which a large number of blade pieces are arranged in a cylindrical shape, is fixed coaxially with the rotation shaft at the tip of a rotary shaft of a motor, and the blade pieces are held on the outer peripheral surface of the fan. A blower characterized by having a resin reinforcement ring fitted therein. 2. The blower according to claim 1, wherein a balance weight for canceling the vibration of the brushless motor is provided on the outer peripheral surface of the reinforcing ring. 3. A blower in which a resin fan having a large number of blade pieces arranged in a cylindrical shape is coaxially fixed to the rotary shaft at the tip of the rotary shaft of a motor. The blower is held so as to be inclined so as to be located closer to the rotation direction of the fan. 4. A spiral fan case having a fan case bottom plate, which also functions as a fixing member of the motor, having an air intake port in a portion substantially aligned with the inner peripheral surface of the fan and surrounding the outer circumference of the fan. The blower according to claim 3, wherein the blower is fixed and the air intake port is formed as a stepped opening having an inclined surface.