JP2012067608A - Blower with silencing box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower with a silencing box capable of lengthening the service life of a motor, by preventing the entry of dust into a motor bearing part.SOLUTION: The blower with the silencing box includes a double-suction type centrifugal blower 9 inside a box-shaped machine body 3 for oppositely arranging a machine body suction port 1 and a machine body blowout port 2, wherein the double-suction type centrifugal blower 9 has on both side surfaces a casing side plate 14 provided with a discharge port opposed to the machine body blowout port 2, a spiral scroll 12 and a suction port 13, and an impeller is driven by the motor 10 fixed to the suction port vicinity of a casing. A bearing 16 of the motor 10 is fixed to a motor housing 17, and is constituted by having a circular bearing cover having an outer diameter larger than a rotary shaft hole of the motor housing 17 on a rotary shaft on the load side of the bearing 16, to thereby provide the blower with the silencing box capable of lengthening the service life of the motor 10 by restraining intrusion of the dust into the bearing 16 from a clearance between the rotary shaft and the rotary shaft hole of the motor housing 17.

Description

  The present invention relates to a fan with a sound deadening box that is used by incorporating a blower inside a sound deadening box such as a ventilation air blower.

  Conventionally, with regard to prevention of dust intrusion into the motor bearings of ventilation blower equipment including a blower with a silencer box used for ventilation of dusty gas, it is integrated with the boss formed on the main plate of the single suction impeller It is known that a rib covers a bearing housing portion of a motor. (For example, refer to Patent Document 1).

  Hereinafter, prevention of dust from entering the bearing portion of the motor of the ventilation fan will be described with reference to FIG.

  As shown in FIG. 11, a fan casing 103 containing an impeller 102 inside a main body 101 and a single suction centrifugal blower 105 having a motor 104 disposed therein are accommodated and sucked from a suction port 106 provided on the lower surface of the main body 101. The air is blown out from the machine air outlet 107 on the side surface of the main body 101 through the single suction centrifugal blower 105. The main plate 108 of the impeller 102 is provided with a rib 110 formed integrally with the boss portion 109, and has a structure in which the bearing housing 111 of the motor 104 is covered by the rib 110.

JP 2005-300013 A

  In the conventional structure as shown in FIG. 11, since the rib 110 is formed integrally with the boss portion 109, there is a problem that the shape of the boss portion 109 is complicated and expensive. Further, when this structure is implemented with a double suction impeller, the distance from the main plate 108 of the impeller 102 to the bearing housing 111 becomes long, so the rib 110 becomes long and expensive, and the airflow inside the impeller 102 is increased. Since the rib 110 is formed in the inflow portion, there is a problem in that the airflow into the impeller 102 is inhibited and the air blowing capability is reduced.

  The present invention solves such conventional problems, and by devising the structure of the motor bearing section, dust can enter the motor bearing section at a low cost with a simple structure without deteriorating the blowing capacity. The object is to provide a fan with a sound deadening box that can prevent the motor and extend the life of the motor.

  In order to achieve the above object, the blower with a sound deadening box of the present invention includes a double suction centrifugal blower inside a box-shaped airframe provided with a fuselage suction port and a fuselage blowout port facing each other, and the double suction centrifugal The blower is equipped with a silencer box that is equipped with a discharge port facing the fuselage outlet, a casing side plate provided with a spiral scroll and a casing suction port on both sides, and an impeller driven by a motor fixed near the casing suction port. A blower, wherein the bearing of the motor is fixed to the motor housing, and a rotary bearing on the load side of the bearing is provided with a circular bearing cover having an outer diameter larger than the rotation shaft hole of the motor housing. It is.

  According to the present invention, a centrifugal blower is provided inside a box-shaped airframe that is provided with a fuselage suction port and a fuselage air outlet facing each other, and the centrifugal blower has a discharge port that faces the airframe blowout port, a spiral scroll, and the like. A blower with a sound deadening box is provided with a casing side plate provided with a casing suction port on both sides, and the impeller is driven by a motor fixed in the vicinity of the casing suction port, and the bearing of the motor is fixed to the motor housing, Since the rotary shaft on the load side of the bearing is provided with a circular bearing cover having a larger outer diameter than the rotation shaft hole of the motor housing, dust can enter the motor bearing portion with a simple structure at low cost. Therefore, it is possible to provide a fan with a sound deadening box that has an effect of extending the life of the motor.

Plane | planar block diagram of the air blower with a silencer box of Embodiment 1 of this invention Side structure diagram showing the installation state of the blower with the sound deadening box Plane | planar block diagram of the air blower with a silencer box of Embodiment 2 of this invention Plane | planar block diagram of the air blower with a silencer box of Embodiment 3 of this invention The perspective view of the bearing cover of Embodiment 3 of this invention The perspective view of the bearing cover of Embodiment 4 of this invention Plane | planar block diagram of the air blower with a silencer box of Embodiment 5 of this invention Plane | planar block diagram of the air blower with a silencer box of Embodiment 6 of this invention The perspective view of the bearing cover of Embodiment 6 of this invention Plane | planar block diagram of the air blower with a silencer box of Embodiment 7 of this invention Plan configuration diagram of conventional ventilation fan

  The blower with a sound deadening box according to claim 1 of the present invention is provided with a double suction centrifugal blower inside a box-shaped airframe in which a fuselage suction port and a fuselage blowout port are provided facing each other, It is a blower with a sound deadening box equipped with a discharge port facing the fuselage outlet, a spiral scroll and a casing side plate provided with a casing suction port on both sides, and an impeller driven by a motor fixed in the vicinity of the casing suction port. The bearing of the motor is fixed to the motor housing, and the rotary shaft on the load side of the bearing is provided with a circular bearing cover having an outer diameter larger than the rotation shaft hole of the motor housing, By providing a circular bearing cover with a larger outer diameter than the rotation shaft hole of the motor housing, airflow toward the rotation shaft hole of the motor housing can be shut off, and It has an effect of suppressing dust from entering the bearing portion from the gap between the rotation shaft hole of over housing.

  In addition, the outer periphery of the bearing cover is bent to the motor housing side, and the bearing portion of the motor is covered with the bearing cover, so that the gap between the bearing cover and the motor housing can be reduced, and the gap between the bearing cover and the motor housing is reduced. It has an effect that dust can be prevented from entering the space.

  In addition, by arranging a plurality of blades extending radially from the rotating shaft side of the motor radially to the bearing cover, the air flow inside the impeller can be smoothly moved by the air flow generated by the rotation of the bearing cover. The air flow inside the impeller by the bearing cover can be suppressed, and the dust can be prevented from entering the vicinity of the rotation shaft hole of the motor housing by the air flow.

  In addition, since the blades provided on the bearing cover have a shape that curves and recedes in the rotation direction, highly efficient turbo-shaped blades can be formed on the bearing cover, and the load due to rotation of the bearing cover can be reduced. .

  In addition, a plurality of blades extending radially from the bearing side surface of the motor to the motor housing side are arranged radially on the bearing cover, so that an air flow is generated inside the bearing cover by rotating the bearing cover, and the temperature covered with the bearing cover is increased. It has the effect | action that a bearing part with a high raise value can be cooled.

  Further, a plurality of blades are arranged radially on the surface of the bearing cover opposite to the bearing of the motor to constitute a mixed flow fan-shaped impeller. The mixed fan fan-shaped impeller can smoothly guide the airflow inside the impeller from the blade boss side to the bearing portion side of the motor. In addition, the airflow generated by the rotation of the bearing cover allows the airflow inside the impeller to smoothly flow into the impeller side, thereby suppressing the turbulence of the airflow inside the impeller by the bearing cover. Furthermore, it has the effect | action that the penetration | invasion of the dust to the rotating shaft hole vicinity of a motor housing can also be suppressed with an airflow.

  Also, the diameter of the mounting hole on the rotating shaft of the bearing cover is made smaller than the diameter of the rotating shaft, it is made of elastic material, and it is configured to be fitted and fixed to the rotating shaft. It has the effect that it can be attached to a shaft.

  In addition, the bearing cover is fixed to the boss of the impeller, so that the fixing area of the bearing cover fixing part can be secured widely, the fixing strength can be kept strong, and the motor is operated at high speed. The bearing cover can be prevented from idling.

  Further, since the bearing cover is formed of a silicon rubber material, the bearing cover can be prevented from deteriorating even when a high temperature gas is sucked.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the blower with a sound deadening box of the present embodiment is provided with a machine body inlet 1 and a machine body outlet 2 on opposite side surfaces of a box-shaped body 3. The airframe 3 is provided with a suction side adapter 5 that connects the suction side duct 4 to the airframe suction port 1, and the airframe outlet 2 is provided with a blowout side adapter 7 that connects the blowout side duct 6. Inside the airframe 3 is an air passage 8 extending from the airframe inlet 1 to the airframe outlet 2. A double suction centrifugal blower 9 is disposed in the body 3 (air passage 8). The both suction type centrifugal blowers 9 have an impeller 11 fixed to a motor 10, a spiral casing 12, and a fan casing 15 including casing side plates 14 on both side surfaces provided with suction ports 13. A bearing 16 of the motor 10 is fixed to the motor housing 17, and a circular bearing cover having an outer diameter larger than that of the rotation shaft hole 19 of the motor housing 17 in the vicinity of the rotation shaft hole 19 of the rotation shaft 18 on the load side of the bearing 16. 20 is provided.

  As shown in FIG. 2, such a blower with a sound deadening box is constructed by connecting a suction side duct 4 to the airframe inlet 1 and an outlet side duct 6 to the airframe outlet 2 in the ceiling 21. The airframe 3 is provided with an airframe inlet 1 on the suction side, an airframe outlet 2 on the blowout side, a double suction centrifugal fan 9 inside the airframe 3, and a construction hanging bracket 22 on the outer surface. The airframe 3 is installed on the ceiling 21 by fixing the construction hanging bracket 22 to the suspension bolt 24 embedded in the ceiling surface 23. When the both suction type centrifugal blowers 9 are operated, the air in the room 25 passes through the blowout side duct 6 via the suction side duct 4 and the both suction type centrifugal blowers 9 and is exhausted to the outdoor 26. The ceiling back 21 and the room 25 are partitioned by a ceiling material 27, and the ceiling material 27 is provided with a ceiling inspection port 28 at a position directly below the body 3.

  The operation and effect of the above configuration will be described. When the blower with the sound deadening box of the present embodiment is operated, an air flow is generated inside the airframe 3 (the air passage 8). This airflow flows from the suction port 13 into the both suction centrifugal blowers 9. At this time, the bearing cover 20 blocks the air flow toward the rotation shaft hole 19 of the motor housing 17, and reaches the bearing 16 portion from the gap formed between the rotation shaft 18 and the rotation shaft hole 19 of the motor housing 17. Intrusion of dust will be suppressed.

  Further, since the bearing cover 20 has a hole diameter attached to the rotary shaft 18 smaller than the diameter of the rotary shaft 18, is formed of an elastic material, and is fitted and fixed to the rotary shaft 18. It can be easily attached to the rotary shaft 18 without using.

  The bearing cover 20 is made of a silicon rubber material. Since the silicone rubber material is excellent in heat resistance, deterioration of the bearing cover 20 can be suppressed even when a high-temperature gas is sucked.

  As described above, according to the blower with the sound deadening box according to the first embodiment of the present invention, the life of the motor 10 can be extended by suppressing the intrusion of dust into the bearing 16 portion of the motor 10.

  Further, the bearing cover 20 can be easily fixed to the rotary shaft 18, and the number of product assembly steps can be reduced.

  Further, by suppressing the deterioration of the bearing cover 20, it is possible to suppress the intrusion of dust into the bearing 16 portion of the motor 10 for a long period of time, and the maintenance period of the motor 10 can be extended.

(Embodiment 2)
As shown in FIG. 3, in the second embodiment, the outer periphery 29 of the bearing cover 20 is bent toward the motor housing 17, and the bearing 16 portion of the motor 10 is covered with the bearing cover 20.

  With the above configuration, the gap between the bearing cover 20 and the motor housing 17 can be reduced, and the entry of dust into the space between the bearing cover 20 and the motor housing 17 can be suppressed.

  As described above, according to the blower with the sound deadening box according to the second embodiment of the present invention, the intrusion of the dust into the bearing 16 portion of the motor 10 is suppressed by suppressing the intrusion of the dust into the vicinity of the rotation shaft hole 19 of the motor housing 17. Will be suppressed.

(Embodiment 3)
As shown in FIGS. 4 and 5, in the third embodiment, a plurality of blades 30 that extend radially from the rotation shaft 18 side of the motor 10 in the outer circumferential direction are arranged on the bearing cover 20. The blade 30 has a surface parallel to the rotation shaft 18.

  When the blade 30 rotates, an air flow 31 from the rotating shaft 18 side toward the impeller 11 side is generated, and the air flow 31 can suppress the disturbance of the air flow inside the impeller 11 due to the bearing cover 20, and the rotation shaft of the motor housing 17. Intrusion of dust into the vicinity of the hole 19 can be suppressed.

  Thus, according to the air blower with a sound deadening box of Embodiment 3 of this invention, the fall of the ventilation capability of the double suction type centrifugal air blower 9 can be suppressed by suppressing the disturbance of the air flow inside the impeller 11.

  Further, by suppressing the intrusion of dust into the vicinity of the rotation shaft hole 19 of the motor housing 17, the intrusion of dust into the bearing 16 portion of the motor 10 is suppressed.

(Embodiment 4)
As shown in FIG. 6, in the fourth embodiment, the bearing cover 20 is provided with a rearward-facing blade 32 that is curved and retreats in the rotational direction.

  With the above configuration, when the bearing cover 20 rotates, an air flow 31 from the rotating shaft 18 side toward the impeller 11 side is generated, and the turbulence of the air flow inside the impeller 11 by the bearing cover 20 can be suppressed by the air flow 31, Intrusion of dust into the vicinity of the rotation shaft hole 19 of the motor housing 17 can be suppressed, and the load caused by the rotation of the bearing cover 20 can be reduced by using the highly efficient rearward blade 32.

  As described above, according to the blower with a sound deadening box according to the fourth embodiment of the present invention, it is possible to suppress a decrease in the blowing capacity of the double suction centrifugal blower 9 by suppressing the turbulence of the airflow inside the impeller 11, and further, the motor 10 Input is suppressed, and intrusion of dust into the bearing 16 portion of the motor 10 is suppressed while reducing power consumption.

(Embodiment 5)
As shown in FIG. 7, in the fifth embodiment, a plurality of blades 33 extending radially from the bearing 16 side surface to the motor housing 17 side are arranged radially on the bearing cover 20.

  With the above configuration, the bearing cover 20 rotates to generate an air flow 34 inside the bearing cover 20, and the bearing 16 covered with the bearing cover 20 by the air flow 34 and having a high temperature rise value can be cooled.

  Thus, according to the air blower with a sound deadening box of Embodiment 5 of the present invention, by cooling the bearing 16 of the motor 10, the temperature rise of the bearing 16 can be suppressed and the life of the bearing 16 can be extended.

(Embodiment 6)
As shown in FIGS. 8 and 9, in the sixth embodiment, a plurality of blades are arranged radially on the opposite surface of the bearing 16 of the bearing cover 20 to form a mixed flow fan-shaped small-diameter impeller 35. To do.

  With the above-described configuration, the airflow 31 generated by the rotation of the bearing cover 20 by smoothly guiding the airflow inside the impeller 11 from the blade boss 36 side to the bearing 16 side of the motor 10 by the small fan impeller 35 having a mixed flow fan shape. Thus, the turbulence of the airflow inside the impeller 11 due to the bearing cover 20 can be suppressed. Further, the inflow of dust into the vicinity of the rotary shaft hole 19 of the motor housing 17 can be suppressed by the airflow 31.

  Thus, according to the air blower with a sound deadening box of Embodiment 6 of this invention, the fall of the ventilation capability of the double suction type centrifugal air blower 9 can be suppressed more by suppressing the disturbance of the air flow inside the impeller 11.

  In addition, the entry of dust into the bearing 16 portion of the motor 10 is suppressed.

(Embodiment 7)
As shown in FIG. 10, in the seventh embodiment, the bearing cover 20 is fixed to the blade boss 36 of the impeller 11.

  With the above configuration, the fixing area of the fixing portion of the bearing cover 20 can be secured widely, the fixing strength can be kept strong, and the idling of the bearing cover 20 when the motor 10 is operated at a high rotation can be prevented.

  Thus, according to the blower with a sound deadening box according to the seventh embodiment of the present invention, it is possible to prevent deterioration and damage of the bearing cover 20 by preventing the bearing cover 20 from spinning idle.

  It can be applied to the use of equipment such as a ventilating blower that is intended for air conveyance and is exposed to dust and needs to be operated for a long period of time.

DESCRIPTION OF SYMBOLS 1 Airframe inlet 2 Airframe outlet 3 Airframe 8 Air path 9 Both suction type centrifugal blower 10 Motor 11 Impeller 12 Scroll 13 Inlet 14 Casing side plate 15 Fan casing 16 Bearing 17 Motor housing 18 Rotating shaft 19 Rotating shaft hole 20 Bearing cover

Claims (9)

Provided with both suction type centrifugal blower inside the box-shaped airframe provided with the airframe inlet and the airframe outlet facing each other,
The both suction type centrifugal blowers are provided with a discharge port facing the fuselage outlet, a spiral scroll, a casing side plate provided with a casing suction port on both side surfaces, and an impeller fixed by a motor near the casing suction port. A fan with a sound deadening box for driving, wherein the bearing of the motor is fixed to the motor housing, and a circular bearing cover having an outer diameter larger than the rotation shaft hole of the motor housing is provided on the rotating shaft on the load side of the bearing. A blower with a sound deadening box, characterized by comprising. Bend the outer periphery of the bearing cover toward the motor housing;
The fan with a sound deadening box according to claim 1, wherein the bearing portion of the motor is covered with the bearing cover. The blower with a muffler box according to claim 1 or 2, wherein a plurality of blades extending radially outward from the rotating shaft side of the motor are arranged radially on the bearing cover. 4. A fan with a sound deadening box according to claim 3, wherein the blade provided on the bearing cover is a backward-facing blade that curves in the rotational direction and moves backward. The blower with a sound deadening box according to claim 2, wherein a plurality of blades extending from the surface on the motor bearing side to the motor housing side are radially arranged on the bearing cover. The blower with a sound deadening box according to claim 2, wherein a plurality of blades are radially arranged on a surface of the bearing cover opposite to the motor bearing to constitute a mixed flow fan-shaped impeller. The diameter of the mounting hole to the rotating shaft of the bearing cover is made smaller than the diameter of the rotating shaft, formed of an elastic material, and fitted and fixed to the rotating shaft. Blower with silencer box of description. The blower with a sound deadening box according to claim 1 or 7, wherein the bearing cover is fixed to a boss portion of an impeller. The blower with a sound deadening box according to any one of claims 1 to 8, wherein the bearing cover is formed of a silicon rubber material.

Images