CN108700091B

CN108700091B - Fan device

Info

Publication number: CN108700091B
Application number: CN201780011946.XA
Authority: CN
Inventors: 小岛善德; 黑沼隆行; 大石洋平; 真武幸三; 大山敦
Original assignee: Ebara Corp
Current assignee: Ebara Corp
Priority date: 2016-02-22
Filing date: 2017-02-21
Publication date: 2020-06-12
Anticipated expiration: 2037-02-21
Also published as: JPWO2017146031A1; WO2017146031A1; CN108700091A

Abstract

The present invention relates to a fan device for transferring gas. The fan device has: an electric motor (7); a fan (5) fixed to a rotating shaft (6) of the motor (7); an inverter (8) capable of changing the speed of the motor (7); a motor housing (17) having a motor chamber (27) for housing the motor (7) and an inverter chamber (28) for housing the inverter (8); and a rectifying plate (45) which is arranged close to the end wall of the motor housing (17) constituting the inverter chamber (8) and has a width larger than the width of the motor housing (17). A vent hole (45b) is formed in the rectifying plate (45).

Description

Fan device

Technical Field

The present invention relates to a fan device for transferring air, and more particularly to a fan device provided in a heat exchanger such as a cooling tower or a radiator.

Background

Conventionally, a cooling tower has been used as a heat exchanger for cooling water used in air-conditioning equipment, plant equipment (plant), or the like. The cooling tower has a fan device for introducing outside air into the cooling tower, and a fan of the fan device is usually rotated at a low speed by a motor. A fan device is also used in a radiator that cools cooling water by bringing air into contact with the outer surface of a cooling water pipe through which the cooling water flows.

The motor of the fan device is generally a two-pole or four-pole motor selected in consideration of cost, weight, size, and the like. In order to operate the fan at a low speed, the fan is coupled to the motor via a speed reduction mechanism. The speed reduction mechanism is, for example, a belt speed reduction mechanism having a plurality of pulleys and a belt wound around the pulleys, or a gear speed reduction mechanism in which a plurality of gears are combined.

A fan apparatus having an inverter (inverter) capable of changing the speed of a motor is also used. The inverter is connected to the motor, and the motor can be driven at a desired rotational speed by the inverter. In a conventional cooling tower, an inverter is provided on a side surface of a cooling tower main body or provided at a distance from the cooling tower main body.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5043382

Patent document 2: japanese patent No. 5711654

Disclosure of Invention

In the case of using a fan device in which a motor is coupled to a fan via a speed reduction mechanism, it is necessary to consider the installation site and the installation structure of the speed reduction mechanism. Further, when the fan is frequently started and stopped, noise may be generated from the reduction gear. When the rotational speed of the motor is controlled by the inverter, the fan can be started and stopped comfortably, and therefore, the generation of noise can be suppressed. However, the installation site and the installation structure of the inverter need to be considered. Therefore, a fan device in which an inverter and a motor are unitized is desired.

When the motor is rotated, the motor generates heat. When the inverter and the motor are unitized (for example, the inverter is mounted on a side surface of a motor case that houses the motor), heat generated from the motor is transmitted to the inverter. In this case, it is difficult to efficiently cool the inverter. Further, when the cooling tower (or radiator) is installed outdoors, the motor and the inverter are irradiated with direct sunlight, and therefore it is more difficult to reduce the temperature of the motor and the inverter.

During operation of the fan device, the temperature in the motor case housing the motor increases, while after the fan device is stopped, the temperature in the motor case decreases to normal temperature. A cable hole through which a cable for supplying electric power to the motor is inserted is formed in the motor case. When the temperature in the motor case rises, the air in the motor case expands, and when the temperature in the motor case falls, the air in the motor case contracts. At this time, since the outside air enters the motor case through the cable hole, moisture in the air may condense in the motor case. The dew water may reduce the insulation performance of the motor or may rust the motor case. Therefore, in order to reduce the amount of outside air that enters the motor case, it is preferable to efficiently cool the motor and the inverter that is integrated with the motor, and to maintain the temperature in the motor case low.

Accordingly, an object of the present invention is to provide a fan device which has an inverter integrated with a motor and can efficiently cool the inverter and the motor.

One aspect of the present invention is a fan apparatus including: an electric motor; a fan fixed to a rotating shaft of the motor; an inverter capable of changing the speed of the motor; a motor housing having a motor chamber for housing the motor and an inverter chamber for housing the inverter; and a rectifying plate disposed close to an end wall of the motor case constituting the inverter chamber and having a width larger than a width of the motor case, wherein the motor is located between the inverter and the fan, and the rectifying plate has a vent hole.

In a preferred aspect of the present invention, the vent hole is formed in a central portion of the rectifying plate.

In a preferred aspect of the present invention, the flow regulating plate is provided with an inclined portion inclined toward the outer peripheral edge of the flow regulating plate and the fan.

A preferred embodiment of the present invention is characterized by further comprising inverter fins provided on the end wall.

A preferred embodiment of the present invention is characterized in that the frequency converter has a power element in contact with an inner surface of the end wall.

A preferred embodiment of the present invention is characterized by having a motor heat sink provided on a side wall of the motor case.

In a preferred aspect of the present invention, the fan further includes a pipe member surrounding a side wall of the motor housing with a space therebetween, and the pipe member has an enlarged portion that is enlarged outward toward the fan.

In a preferred aspect of the present invention, the coils of the stator of the motor are covered with resin.

In a preferred aspect of the present invention, the motor is a PM motor in which a permanent magnet is disposed on a rotor.

In a preferred aspect of the present invention, the PM motor is an IPM motor in which a permanent magnet is disposed inside a rotor.

In a preferred aspect of the present invention, the IPM motor includes cover plates for covering both end surfaces of the rotor.

A preferred embodiment of the present invention is characterized by further comprising: a bearing rotatably supporting the rotary shaft; and a bearing cover that covers the bearing, the bearing cover being disposed between the motor and the bearing.

In a preferred aspect of the present invention, the motor further includes a shaft seal disposed at a shaft insertion portion through which the rotating shaft is inserted into the motor housing, the shaft seal sealing a gap between the rotating shaft and the motor housing, the shaft seal including: a rotary member having a disk-shaped base fixed to an outer peripheral surface of the rotary shaft, and a cylindrical protruding portion extending from the base toward the motor housing; and a stationary member fixed to the shaft insertion portion and having a recess formed therein to surround the protrusion.

In a preferred aspect of the present invention, the recessed portion has a 1 st side surface facing an outer peripheral surface of the protruding portion and a 2 nd side surface facing an inner peripheral surface of the protruding portion, and a lip contacting the 2 nd side surface is provided on the inner peripheral surface of the protruding portion.

Effects of the invention

According to the present invention, since the motor chamber housing the motor and the inverter chamber housing the inverter are formed by the motor case, a compact fan device in which the inverter and the motor are unitized can be provided. Also, since air flows on the outer surface of the motor case by the rotation of the fan, heat generated in the motor is carried away by the air to be removed from the motor case. The air flowing on the outer surface of the motor case also passes through an air flow path formed between the rectifying plate and the end wall of the motor case, and flows out from the vent hole of the rectifying plate. The heat generated in the frequency converter is taken away by the air passing through the air flow path. As a result, both the motor and the inverter can be cooled efficiently.

Drawings

Fig. 1 is a schematic diagram showing an example of a cooling tower.

Fig. 2 is a schematic view showing another example of the cooling tower.

Fig. 3A is a schematic diagram showing an example of a heat sink.

Fig. 3B is a schematic view showing the cooling water pipe meandering in the internal space of the housing shown in fig. 3A.

Fig. 4 is a sectional view of a fan apparatus according to an embodiment.

Fig. 5 is a top view of the cover shown in fig. 4.

Fig. 6 is a sectional view showing a part of a stator of the motor shown in fig. 4.

Fig. 7 is an enlarged cross-sectional view showing an example of the shaft seal.

Fig. 8 is an enlarged cross-sectional view showing a modification of the shaft seal shown in fig. 7.

Fig. 9 is a sectional view of a fan apparatus according to another embodiment.

Fig. 10 is a view showing a fan device according to another embodiment.

Fig. 11 is a view showing a fan device according to another embodiment.

Fig. 12 is a view showing a modification of the cooling tower shown in fig. 1.

Detailed Description

Embodiments of the present invention are described below with reference to the drawings.

Fig. 1 is a schematic diagram showing an example of a cooling tower. The cooling tower shown in fig. 1 includes a cooling tower body 3, a filler 2 disposed inside the cooling tower body 3, and a fan device 1 attached to an upper portion of the cooling tower body 3. The detailed structure of the fan apparatus 1 will be described later. When the fan 5 disposed in the fan case 18 of the fan device 1 is rotated by the motor 7, air is sucked into the cooling tower main body 3 through a louver (louver)15 provided on a side surface of the cooling tower main body 3. The air sucked into the cooling tower main body 3 is discharged from the cooling tower after passing through the fan device 1. The cooling water introduced into the cooling tower flows through an introduction pipe 10 extending through the cooling tower body 3. A discharge port 10a located above the filler 2 is formed at the end of the introduction pipe 10, and the cooling water is discharged from the discharge port 10a to the filler 2. The cooling water discharged to the filler 2 flows down inside the filler 2, and comes into contact with the air sucked into the cooling tower main body 3 by the fan device 1. Thereby, heat is exchanged between the cooling water and the air, and the cooling water is cooled. The cooled cooling water is collected in a water tank 12 provided at a lower portion of the cooling tower main body 3, and is discharged to the outside of the cooling tower through a water discharge pipe 11 connected to the water tank 12. The cooling tower shown in fig. 1 is a water-cooled heat exchanger in which cooling water is directly cooled by air, and is called an open cooling tower.

Fig. 2 is a schematic view showing another example of the cooling tower. The configuration of the present embodiment, which is not particularly described, is the same as the configuration of the cooling tower shown in fig. 1, and therefore, redundant description thereof is omitted.

An inlet pipe 10 of the cooling tower shown in fig. 2 is connected to one end of a coil 20 disposed inside the cooling tower body 3, and a drain pipe 11 for discharging cooling water from the cooling tower is connected to the other end of the coil 20. The cooling water flows into coil 20 from inlet pipe 10, and flows out from coil 20 to drain pipe 11. Also, the cooling tower has a sprinkler tube 22 for distributing water to the coil 20. The water spray pipe 22 extends from the outside of the cooling tower to above the coil pipe 20, and a water spray opening 22a for dispersing water is formed at the end of the water spray pipe 22. The water sprayed from the water spray opening 22a of the water spray pipe 22 comes into contact with the surface of the coil pipe 20, thereby exchanging heat with the cooling water flowing in the coil pipe 20. Thereby, the cooling water flowing through the coil 20 is cooled. The water sprayed from the water spray opening 22a of the water spray pipe 22 is cooled by the air sucked into the cooling tower main body 3 by the fan device 1. The water flowing down in contact with the coil 20 is collected in the water tank 12, and is discharged to the outside of the cooling tower through a water discharge pipe 25 connected to the water tank 12. The cooling tower shown in fig. 2 is a water-cooled heat exchanger in which cooling water flowing through the coil 20 is cooled by water distributed from the sprinkler pipe 22, and is called an enclosed cooling tower.

Fig. 3A is a schematic view showing an example of a radiator, and fig. 3B is a schematic view showing a cooling water pipe meandering in the internal space of the housing shown in fig. 3A. The heat sink shown in fig. 3A has: a radiator main body 32, a frame 33 to which a cooling water pipe 30 through which cooling water flows is attached, and the fan device 1. As shown in fig. 3B, the cooling water pipe 30 meanders in the internal space of the housing 33 so that the straight tube portion 30a of the cooling water pipe 30 extends in the horizontal direction. The cooling water pipe 30 may be configured to meander in the internal space of the housing 33 such that the straight pipe portion 30a of the cooling water pipe 30 extends in the vertical direction. The frame 33 is fitted into an opening formed in a side surface of the heat sink body 32 and fixed to the heat sink body 32. When the fan 5 of the fan device 1 is rotated by the motor 7, air is drawn into the radiator main body 32 through a gap formed between the straight tube portions 30a of the cooling water tube 32 that meanders. A fin (not shown) is usually attached to the cooling water pipe 30, and heat of the cooling water flowing through the cooling water pipe 30 is transmitted to the fin. The cooling water flowing through the cooling water pipe 30 of the radiator exchanges heat with the air taken into the interior of the radiator main body 32 by the fan device 1 through the cooling water pipe 30 and the fins. Thereby, the cooling water flowing through the cooling water pipe 30 is cooled. The radiator shown in fig. 3A is an air-cooled heat exchanger in which the cooling water flowing through the cooling water pipe 30 is cooled by air.

Fig. 4 is a sectional view of the fan apparatus 1 according to the embodiment. In fig. 4, the fan case 18 is not shown. The fan device 1 is provided in a cooling tower shown in fig. 1 or 2 or a radiator shown in fig. 3A. The fan device 1 includes a fan 5, a motor 7 for rotating the fan 5, and an inverter 8 capable of changing the speed of the motor 7. The fan 5 has a hub 16, and a plurality of fins 14 extending radially from the hub 16. The hub 16 of the fan 5 is fixed to the end of the rotary shaft 6 of the motor 7, and the fan 5 and the motor 7 are directly connected to each other.

The fan device 1 has a motor case 17 housing the motor 7 and the inverter 8, and thereby unitizes the inverter 8 and the motor 7. In the present embodiment, the motor case 17 has a cylindrical shape. The interior of the motor case 17 is divided into a motor chamber 27 and an inverter chamber 28 by a partition wall 29, and the inverter chamber 28 is located above the motor chamber 27. The motor 7 is housed in a motor chamber 27 formed inside the motor case 17, and the inverter 8 is housed in an inverter chamber 28 formed inside the motor case 17. The motor 7 is thus located between the frequency converter 8 and the fan 5. The upper wall (end wall) of the motor case 17 is constituted by a detachable cover 40. The cover 40 constitutes the upper part of the converter chamber 28.

A power cable hole 17a is formed in a side wall 17b of the motor case 17, and a power cable 42 for supplying electric power from a power source (not shown) to the inverter 8 extends through the power cable hole 17 a. A motor cable hole 29a is formed in the partition wall 29, and a motor cable 46 for supplying electric power from the inverter 8 to the motor 7 extends through the motor cable hole 29 a.

A control unit 51 connected to the inverter 8 is disposed in the inverter chamber 28. In the present embodiment, the control unit 51 is disposed on an inverter substrate 8a on which power elements (for example, switching elements such as IGBTs) 50 and the like are disposed, and the power elements 50 constitute the inverter 8. In one embodiment, the control unit 51 may be disposed separately from the inverter 8. The control unit 51 controls the switching operation of the power element 50 of the inverter 8, thereby controlling the rotation speed of the motor 7, that is, the rotation speed of the fan 5.

The Motor 7 may be an induction Motor, but the Motor 7 is preferably a PM Motor (Permanent Magnet Motor) having a rotor in which Permanent magnets are arranged and a stator arranged to face the rotor. In particular, as shown in fig. 4, the Motor 7 is preferably an IPM Motor (interior permanent Magnet Motor) in which a permanent Magnet 41 is disposed inside a rotor 43. Since the PM motor (especially, IPM motor) has high efficiency, heat generation of the motor 7 can be suppressed.

The rotor 43 is fixed to the rotary shaft 6, and the stator 44 is fixed to the inner surface of the motor housing 17. Therefore, heat generated in the stator 44 of the motor 7 is transferred to the motor housing 17. The motor 7 shown in fig. 4 is a radial gap motor in which the stator 44 is disposed radially outward of the rotor 43. Although not shown, the motor 7 may be an axial gap motor in which a stator and a rotor are arranged in an axial direction.

The rotary shaft 6 of the motor 7 shown in fig. 4 is rotatably supported by two

bearings

35 and 36 disposed at an interval in the vertical direction. An upper bearing 35 is mounted on the lower surface of the partition wall 29 (i.e., the upper surface of the motor chamber 27), and a lower bearing 36 is mounted on the lower surface of the motor chamber 27.

A rectifying plate 45 is disposed adjacent to an upper wall (end wall) of the motor case 17. More specifically, the rectifying plate 45 is disposed above the motor case 17, i.e., above the cover 40. In the present embodiment, since the motor case 17 has a cylindrical shape, the rectifying plate 45 has a disk shape. The rectifying plate 45 is supported by a plurality of ribs (not shown) fixed to the upper surface (outer surface) of the cover 40. The rectifying plate 45 has a width larger than the width of the motor case 17. More specifically, the diameter of the rectifying plate 45 is larger than the diameter of the outer peripheral surface of the motor case 17, and the outer peripheral edge 45a of the rectifying plate 45 protrudes outward from the outer peripheral surface of the motor case 17. The rectifying plate 45 has a vent hole 45b formed in the central portion of the rectifying plate 45. Preferably, the rectifying plate 45 is formed with an inclined portion 45c inclined downward toward the outer peripheral edge 45a of the rectifying plate 45 (i.e., inclined toward the outer peripheral edge 45a of the rectifying plate 45 and the fan 5).

When the motor 7 is driven, the fan 5 is rotated, and the air flows upward from below the fan device 1 by the rotating fan 5. A part of the air flows upward while contacting the outer surface of the motor case 17, and collides with the rectifying plate 45. Since the vent hole 45b is formed in the center of the rectifying plate 45, the air that has collided with the rectifying plate 45 changes its flow direction to a direction toward the center of the rectifying plate 45, and flows through the air flow path 37 formed between the upper surface of the upper wall (i.e., the lid 40) of the motor case 17 and the lower surface of the rectifying plate 45. Then, the air flows from the vent hole 45b to above the rectifying plate 45. In the present embodiment, since the rectifying plate 45 has the inclined portion 45c, the air having collided with the inclined portion 45c of the rectifying plate 45 flows toward the air flow passage 37. As a result, the flow rate of the air flowing through the air flow path 37 can be increased.

According to the present embodiment, since the motor chamber 27 housing the motor 7 and the inverter chamber 28 housing the inverter 8 are formed by the motor case 17, the compact fan apparatus 1 in which the inverter 8 and the motor 7 are unitized can be provided. Also, the heat transmitted from the motor 7 to the motor case 17 is removed from the motor case 17 by the air flowing on the outer surface of the motor case 17 by the rotation of the fan 5. The air flowing on the outer surface of the motor case 17 passes through the air flow passage 37 formed between the lower surface of the rectifying plate 45 and the upper surface of the upper wall (i.e., the cover 40) of the motor case 17, and flows out of the vent hole 45b of the rectifying plate 45. The heat generated in the inverter 8 is carried away by the air passing through the air flow path 37. As a result, both the motor 7 and the inverter 8 can be cooled efficiently. In particular, since the rectifying plate 45 has the inclined portion 45c, the flow rate of the air flowing through the air flow passage 37 is increased, and the inverter 8 can be cooled more efficiently. Also, the rectifying plate 45 can reduce the amount of direct sunlight irradiated to the motor case 17. As a result, the temperature rise of the motor case 17 due to the direct sunlight can be suppressed, and the cooling of the motor 7 and the inverter 8 can be promoted.

As shown in fig. 4, inverter heat sinks 49 may be provided on the upper wall (end wall) of the motor case 17, that is, the upper surface (outer surface) of the cover 40. Fig. 5 is a top view of the cover 40. As shown in fig. 4 and 5, a plurality of inverter heat sinks 49 extending radially are fixed to the upper surface of the cover 40. The inverter heat sinks 49 are arranged at equal intervals along the circumferential direction of the cover 40. Heat generated from the inverter 8 in the inverter chamber 28 is transferred to the inverter heat sink 49 via the cover 40, and is transferred from the inverter heat sink 49 to the air flowing through the air flow passage 37. As a result, the inverter 8 can be efficiently cooled.

In the frequency converter 8, heat is generated mainly from the power element 50. Therefore, as shown in fig. 4, it is preferable to bring the power element 50 into contact with the lower surface (inner surface) of the cover 40 (i.e., the upper wall of the motor housing 17). By bringing the power element 50 into contact with the lower surface of the cover 40, heat generated in the power element 50 is directly transferred to the cover 40. Since the cover 40 is cooled by the air flowing through the air flow passage 37, the heat generated from the inverter 8 is effectively removed, and the cooling of the inverter 8 can be promoted.

Fig. 6 is a partial sectional view of the stator 44 of the motor 7 shown in fig. 4. As shown in fig. 6, the stator 44 includes: a stator core 47 having a plurality of teeth 47 a; and a coil 48 wound around each tooth 47 a. The entire coil 48 is covered with the resin 58. The gaps formed between the teeth 47a are filled with the resin 58, and as shown in fig. 4, the coil ends protruding from the stator core 47 are also covered with the resin 58. In the motor 7, heat is generated mainly from the stator core 47 and the coil 48. In the present embodiment, since the entire coil 48 is covered with the resin 58, most of the heat generated in the coil 48 is transmitted to the stator core 47 through the resin 58. The heat transferred into the stator core 47 and the heat generated from the stator core 47 are transferred to the motor case 17 and removed by the air flowing on the outer surface of the motor case 17 by the rotation of the fan 5. Therefore, the entire coil 48 is covered with the resin 58, whereby cooling of the motor 7 can be promoted.

According to the above embodiment, the motor 7 and the inverter 8 can be efficiently cooled. However, when the fan apparatus 1 is driven, the temperature inside the motor case 17 rises to some extent due to heat generated from the motor 7 and the inverter 8, and when the fan apparatus 1 is stopped, the temperature inside the motor case 17 falls to the normal temperature. At this time, in the inverter chamber 28 of the motor case 17, the outside air is sucked through the power cable hole 17a, and in the motor chamber 27, the outside air is sucked through the motor cable hole 29a from the inverter chamber 28. When the humidity of the outside air sucked into motor chamber 27 is high, dew condensation water may be generated in motor chamber 27. Therefore, as shown in fig. 4, it is preferable to provide cover plates 66 that cover both end faces of the rotor 43, respectively. The cover plate 66 prevents dew condensation water generated in the motor chamber 27 from contacting the permanent magnet 41 disposed inside the rotor 43. As a result, the permanent magnet 41 does not rust, and therefore deterioration of the rotor 43 can be prevented.

Further, it is preferable to provide a bearing cover 67 covering the upper surface of the lower bearing 36. The bearing housing 67 is located between the motor 7 and the lower bearing 36. The dew condensation water generated in the motor chamber 27 is prevented from contacting the lower bearing 36 by the bearing housing 67. As a result, the lower bearing 36 does not rust, and therefore, deterioration of the lower bearing 36 can be prevented.

There are cases where dew condensation water is generated on the outer surface of the motor case 17. A shaft insertion portion through which the rotary shaft 6 is inserted into the motor case 17 is formed in the motor case 17. When dew condensation water generated on the outer surface of the motor case 17 passes through the shaft penetration portion and enters the inside of the motor case 17, the motor 7 is deteriorated. Therefore, as shown in fig. 4, a shaft seal 70 for sealing a gap between the rotary shaft 6 and the motor housing 17 is disposed in the shaft insertion portion of the motor housing 17. The dew condensation water generated at the outer surface of the motor case 17 is prevented from being infiltrated into the motor case 17 by the shaft seal 70.

Fig. 7 is an enlarged sectional view showing an example of the shaft seal 70. The shaft seal 70 shown in fig. 7 includes a rotating member 71 fixed to the rotating shaft 6 and rotating integrally with the rotating shaft 6, and a stationary member 75 fixed to the shaft insertion portion 17c of the motor housing 17. The rotary member 71 includes a disc-shaped base 72 fixed to the outer peripheral surface of the rotary shaft 6, and a cylindrical protrusion 73 extending upward from the base 72 (i.e., extending toward the motor housing 17). In the present embodiment, the protruding portion 73 extends upward from the outer peripheral edge of the base portion 72 and is integrally formed with the base portion 72. In one embodiment, the protruding portion 73, which is a member different from the base portion 72, may be attached to the base portion 72.

The stationary member 75 is formed with a recess 77 surrounding the protrusion 73 of the rotating member 71. More specifically, the recess 77 has: a 1 st side surface 77a having a cylindrical shape facing the outer peripheral surface 73a of the projection 73; and a 2 nd side surface 77b having a cylindrical shape and facing the inner peripheral surface 73b of the projection 73. The 1 st side surface 77a is connected to the bottom surface 77c of the recess 77, and the 2 nd side surface 77b is also connected to the bottom surface 77c of the recess 77. The shaft seal 70 has a labyrinth structure including a projection 73 projecting from a base 72 of the rotating member 71 and a recess 77 surrounding the projection 73. In the present embodiment, the shaft seal 70 has a non-contact shaft seal structure in which the stationary member 75 does not contact the rotating member 71. That is, the 1 st side surface 77a, the 2 nd side surface 77b, and the bottom surface 77c of the recess 77 formed in the stationary member 75 do not contact the protrusion 73 of the rotating member 71.

Gravity acts on dew condensation water generated on the outer surface of the motor housing 17 and flowing to the stationary member 75 of the shaft seal 70. Therefore, the dew condensation water cannot move upward in the gap between the outer peripheral surface 73a of the protruding portion 73 and the 1 st side surface 77a of the recess 77. As a result, the dew condensation water generated on the outer surface of the motor case 17 is prevented from entering the inside of the motor case 17.

Fig. 8 is a sectional view showing a modification of the shaft seal 70 shown in fig. 7. Since the configuration of the present embodiment, which is not described in particular, is the same as the configuration of the shaft seal 70 shown in fig. 7, redundant description thereof will be omitted. The rotary member 71 of the shaft seal 70 shown in fig. 8 has an annular lip 79 provided on the inner peripheral surface 73b of the protruding portion 73. The front end of the lip 79 contacts the 2 nd side surface 77b of the recess 77. In the present embodiment, the shaft seal 70 has not only a labyrinth structure including the projecting portion 73 and the recessed portion 77 surrounding the projecting portion 73, but also a contact type shaft seal structure in which a lip 79 provided on the inner peripheral surface 73b of the projecting portion 73 is in contact with the 2 nd side surface 77b of the recessed portion 77. The lip 79 contacting the 2 nd side surface 77b of the recess 77 reliably prevents dew from entering the motor case 17. Instead of the lip 79 that contacts the 2 nd side surface 77b of the recess 77, a lip that contacts the 1 st side surface 77a of the recess 77 may be provided on the outer peripheral surface 73a of the protruding portion 73.

Fig. 9 is a schematic view of a fan apparatus 1 according to another embodiment. In fig. 9, the fan case 18 is not shown. Since the configuration of the present embodiment, which is not particularly described, is the same as that of the above-described embodiment, a repetitive description thereof will be omitted.

The fan apparatus 1 shown in fig. 9 has a plurality of motor heat sinks 60 provided on the side wall 17b of the motor case 17. The motor fins 60 are fixed to the side wall 17b of the motor case 17 and arranged at equal intervals along the circumferential direction of the motor case 17. Heat generated in the motor 7 is transferred to the motor heat sink 60 via the motor case 17, and is removed from the motor heat sink 60 by air flowing on the outer surface of the motor case 17. As a result, cooling of the motor 7 can be promoted.

As shown in fig. 9, the fan device 1 preferably further includes a pipe member 62 surrounding the side wall 17b of the motor housing 17 at a distance from the side wall 17 b. The pipe member 62 is formed with an enlarged portion 62a that is enlarged toward the lower end of the pipe member 62 (i.e., toward the fan 5). The pipe member 62 is supported by a rib (not shown) fixed to the side wall 17b of the motor case 17. An air flow path 63 through which air flowing upward by the rotation of the fan 5 passes is formed between the inner surface of the pipe member 62 and the side wall 17b of the motor case 17.

By providing the pipe member 62 having the enlarged portion 62a, the air flowing upward by the rotation of the fan 5 collides with the enlarged portion 62a and flows into the air flow path 63. Therefore, by providing the pipe member 62, the flow rate of the air flowing on the outer surface of the motor case 17 can be increased. As a result, heat generated from the motor 7 can be effectively removed, and cooling of the motor can be promoted.

In the above-described embodiment, the fan device 1 that is attached to the cooling tower (see fig. 1 and 2) or the radiator (see fig. 3A) and generates an upward flow of air has been described, but the fan device 1 of the present invention is not limited to this example. For example, the fan device 1 may be used as an exhaust fan for exhausting air from facilities such as a tunnel and an underground parking garage, or may be used as a ventilation fan for replacing air in a building such as a warehouse and a factory with outside air. Alternatively, the fan device 1 may be used as a circulation fan for circulating air in a building such as a warehouse or a factory. Alternatively, the fan device 1 may be disposed in a pipe provided in a gas circulation system such as a high-rise air conditioning system.

The direction of the airflow generated by the fan 5 of the fan device 1 (the direction corresponds to the installation angle of the fan device 1) is not limited to the upper direction. For example, the direction of the airflow generated by the fan 5 of the fan device 1 may be a horizontal direction or an oblique direction (i.e., a direction inclined with respect to the vertical direction or the horizontal direction). The gas to be transferred by the fan device 1 is not limited to air. For example, the fan device 1 may be used to move a gas other than air used in a plant. An example in which the fan device 1 is provided in an apparatus other than a cooling tower and a radiator will be described below with reference to fig. 10 and 11.

Fig. 10 is a view showing a fan apparatus 1 according to another embodiment. The fan device 1 shown in fig. 10 is lifted from a wall surface 80 of a building, and transfers air (for example, air) in the building in a horizontal direction. The fan apparatus 1 is used as a circulation fan for circulating air in a building.

Since the fan apparatus 1 shown in fig. 10 has substantially the same configuration as the fan apparatus 1 shown in fig. 4, the same reference numerals are given to corresponding components, and detailed description thereof will be omitted. In the present embodiment, the fan 5 of the fan device 1 transfers air in the horizontal direction by its rotation. In this fan device 1, the fan device 1 shown in fig. 4 is suspended from a wall surface 80 of a building in a state where the fan device 1 is rotated by 90 °, and a rotary shaft 6 of a motor 7 to which a fan 5 is connected extends in a horizontal direction.

The fan case 18 of the fan device 1 has a cylindrical shape, and the fan 5 and the motor case 17 are housed therein. The fan 5 and the motor case 17 are supported by a plurality of ribs (not shown) fixed to the inner circumferential surface of the fan case 18. Hangers (wire ropes) 82, 82 extending from the outer peripheral surface of the fan case 18 to the wall surface 80 of the building extend, and the fan device 1 is supported on the wall surface 80 of the building by the

wire ropes

82, 82.

Fig. 11 is a view showing a fan apparatus 1 according to another embodiment. The fan apparatus 1 shown in fig. 11 is used as a circulation fan provided in a high-rise air conditioning system. The high-rise air conditioning system includes a pipe 85 through which air flows, and the fan device 1 is disposed in the pipe 85. The fan device 1 is fixed to an inner surface of the pipe 85 by a fixing member (e.g., a rib) not shown, and transfers air in the pipe 85 in an oblique direction.

Since the fan apparatus 1 shown in fig. 11 also has substantially the same configuration as the fan apparatus 1 shown in fig. 4, the same reference numerals are given to corresponding components, and detailed description thereof will be omitted. In the present embodiment, the fan 5 of the fan device 1 transfers the air in the pipe 85 in an oblique direction by its rotation. The fan device 1 shown in fig. 4 is fixed to the inner surface of the pipe 85 in a state where the fan device 1 is tilted, and the rotating shaft 6 of the motor 7 to which the fan 5 is connected extends obliquely. In the present embodiment, the axis of the rotary shaft 6 is parallel to the direction in which the pipe 85 extends.

The fan device 1 shown in fig. 10 or 11 also includes a motor case 17 that houses the motor 7 and the inverter 8, thereby unitizing the inverter 8 and the motor 7. The interior of the motor housing 17 is divided into a motor chamber 27 and an inverter chamber 28 by a partition wall 29. The motor 7 is housed in a motor chamber 27 formed inside the motor case 17, and the inverter 8 is housed in an inverter chamber 28 formed inside the motor case 17. The fan 5 connected to the end of the rotary shaft 6 of the motor 7 is adjacent to the motor chamber 27, and the inverter chamber 28 is located on the opposite side of the fan 5. Therefore, the inverter chamber 28 is located on the downstream side of the airflow generated by the rotation of the fan 5 (hereinafter simply referred to as airflow) from the motor chamber, and the motor 7 is located between the inverter 7 and the fan 5. In the present embodiment, the end wall of the motor case 17 is formed by a detachable cover 40, and corresponds to the upper wall of the motor case 17 shown in fig. 4. The cover 40 constitutes the end of the inverter chamber 28 on the downstream side of the air flow.

The rotary shaft 6 of the motor 7 shown in fig. 10 is rotatably supported by two

bearings

35 and 36 arranged at a distance in the horizontal direction. The rotary shaft 6 of the motor 7 shown in fig. 11 is rotatably supported by two

bearings

35 and 36 arranged at an interval in the oblique direction. The downstream side bearing 35 located on the downstream side of the airflow corresponds to the upper side bearing 35 shown in fig. 4, and the downstream side bearing 35 is mounted on the side surface of the partition wall 29 (i.e., the inner surface of the motor chamber 27 located on the downstream side of the airflow). An upstream side bearing 36 located on the upstream side of the airflow corresponds to the lower side bearing 36 shown in fig. 4, and the upstream side bearing 36 is mounted on the inner surface of the motor chamber 27 located on the upstream side of the airflow. As shown in fig. 10 and 11, the upstream bearing 36 may be covered with a bearing cover 67. The bearing housing 67 is disposed between the motor 7 and the upstream bearing 36. Dew condensation water generated in the motor chamber 27 is prevented from contacting the upstream side bearing 36 by the bearing housing 67.

A rectifying plate 45 is disposed adjacent to the cover 40 constituting the end wall of the motor case 17. In the fan apparatus 1 shown in fig. 10 or 11, the motor case 17 has a cylindrical shape, and therefore the rectifying plate 45 has a circular disk shape. The rectifying plate 45 is supported by a plurality of ribs (not shown) fixed to the outer surface of the cover 40. The rectifying plate 45 has a width larger than the width of the motor case 17. More specifically, the diameter of the rectifying plate 45 is larger than the diameter of the outer peripheral surface of the motor case 17, and the outer peripheral edge 45a of the rectifying plate 45 protrudes outward from the outer peripheral surface of the motor case 17. The rectifying plate 45 has a vent hole 45b formed in the central portion of the rectifying plate 45. Preferably, the flow regulating plate 45 is formed with an inclined portion 45c inclined toward the outer peripheral edge 45a of the flow regulating plate 45 and the fan 5.

When the motor 7 is driven, the fan 5 rotates, and air flows from the fan 5 toward the motor case 17. In the fan apparatus 1 shown in fig. 10, an airflow that flows in a horizontal direction inside the fan housing 18 is generated by the rotating fan 5. In the fan apparatus 1 shown in fig. 11, the rotating fan 5 generates an air flow flowing in an oblique direction inside the pipe 85. A part of the air flows toward the rectifying plate 45 while contacting the outer surface of the motor case 17, and collides with the rectifying plate 45. Since the vent hole 45b is formed in the center of the rectifying plate 45, the air that has collided with the rectifying plate 45 changes its flow direction to a direction toward the center of the rectifying plate 45, and flows through the air flow passage 37 formed between the outer surface of the end wall (i.e., the cover 40) of the motor case 17 and the inner surface of the rectifying plate 45. The air passes through the vent hole 45b and flows in a direction away from the rectifying plate 45. In the fan device 1 shown in fig. 10 or 11, since the rectifying plate 45 has the inclined portion 45c, the air that has collided with the inclined portion 45c of the rectifying plate 45 forms a flow toward the air flow passage 37. As a result, the flow rate of the air flowing through the air flow path 37 can be increased.

In the fan apparatus 1 shown in fig. 10 and 11, since the motor chamber 27 for housing the motor 7 and the inverter chamber 28 for housing the inverter 8 are also formed by the motor case 17, the compact fan apparatus 1 in which the inverter 8 and the motor 7 are unitized can be provided. Also, the heat transmitted from the motor 7 to the motor case 17 is removed from the motor case 17 by the air flowing on the outer surface of the motor case 17 by the rotation of the fan 5. The air flowing on the outer surface of the motor case 17 passes through the air flow passage 37 formed between the inner surface of the rectifying plate 45 and the outer surface of the end wall (i.e., the cover 40) of the motor case 17, and flows out of the vent hole 45b of the rectifying plate 45. The heat generated in the inverter 8 is carried away by the air passing through the air flow path 37. As a result, both the motor 7 and the inverter 8 can be cooled efficiently. In particular, since the rectifying plate 45 has the inclined portion 45c, the flow rate of the air flowing through the air flow passage 37 is increased, and the inverter 8 can be cooled more efficiently.

As shown in fig. 10 and 11, the fan device 1 may include a shaft seal 70 for sealing a gap between the rotary shaft 6 and the motor housing 17. The dew condensation water generated at the outer surface of the motor case 17 is prevented from being infiltrated into the motor case 17 by the shaft seal 70.

The shaft seal 70 includes a rotating member 71 fixed to the rotating shaft 6 and rotating integrally with the rotating shaft 6, and a stationary member 75 fixed to the shaft insertion portion 17c of the motor housing 17. The rotary member 71 includes a disc-shaped base 72 fixed to the outer peripheral surface of the rotary shaft 6, and a cylindrical protrusion 73 extending from the base 72 toward the motor housing 17. The stationary member 75 is formed with a recess 77 surrounding the protrusion 73 of the rotating member 71. The shaft seal 70 has a labyrinth structure including a protruding portion 73 and a recessed portion 77 surrounding the protruding portion 73.

Like the shaft seal 70 described with reference to fig. 7, the shaft seal 70 has a non-contact shaft seal structure in which the stationary member 75 does not contact the rotating member 71. That is, the 1 st side surface 77a, the 2 nd side surface 77b, and the bottom surface 77c of the recess 77 formed in the stationary member 75 do not contact the protrusion 73 of the rotating member 71. In one embodiment, the rotating member 71 of the shaft seal 70 may have an annular lip 79 (see fig. 8) provided on the inner circumferential surface 73b of the protruding portion 73 and contacting the 2 nd side surface 77b of the recess 77. Alternatively, instead of the lip 79 that contacts the 2 nd side surface 77b of the recess 77, a lip that contacts the 1 st side surface 77a of the recess 77 may be provided on the outer peripheral surface 73a of the projection 73.

Although not shown, the fan device 1 shown in fig. 10 or 11 may have a plurality of motor cooling fins 60 (see fig. 9) provided on the side wall 17b of the motor case 17, or may further have a pipe member 62 (see fig. 9) surrounding the side wall 17b of the motor case 17 at a distance therefrom. In the case where the fan apparatus 1 includes the motor heat sink 60, the heat generated in the motor 7 is transmitted to the motor heat sink 60 via the motor case 17, and is removed from the motor heat sink 60 by the air flowing on the outer surface of the motor case 17. As a result, cooling of the motor 7 can be promoted.

When the fan device 1 includes the pipe member 62 (see fig. 9), the pipe member 62 is supported by a rib (not shown) fixed to the side wall 17b of the motor case 17. It is preferable that an enlarged portion 62a which is enlarged toward the fan 5 is formed on the pipe member 62. By providing the pipe member 62 having the enlarged portion 62a, the air flowing upward by the rotation of the fan 5 collides with the enlarged portion 62a and flows into the air flow path 63 (see fig. 9) formed between the inner surface of the pipe member 62 and the side wall 17b of the motor case 17. Therefore, by providing the pipe member 62, the flow rate of the air flowing on the outer surface of the motor case 17 can be increased. As a result, heat generated from the motor 7 can be effectively removed, and cooling of the motor can be promoted.

Fig. 12 is a view showing a modification of the cooling tower shown in fig. 1. Since the configuration of the present embodiment, which is not described in particular, is the same as the cooling tower shown in fig. 1, redundant description thereof is omitted. The structure of the fan apparatus 1 shown in fig. 12 is the same as that of the fan apparatus 1 shown in fig. 10 except for the fan casing 18, and therefore, redundant description thereof is omitted.

The cooling tower shown in fig. 12 has a fan apparatus 1 mounted on a side surface of a cooling tower main body 3. That is, the fan device 1 has the same configuration as the fan device 1 described with reference to fig. 10, and the air is transferred in the horizontal direction by the rotating fan 5.

When the fan 5 disposed in the fan case 18 of the fan device 1 is rotated by the motor 7, air is sucked into the cooling tower main body 3 through the louvers 15 provided on one side surface of the cooling tower main body 3. The air sucked into the cooling tower body 3 flows horizontally inside the cooling tower body 3, passes through the fan device 1 provided on the other side surface of the cooling tower body 3, and is discharged from the cooling tower body 3. The cooling water discharged from the discharge port 10a to the filler 2 is in contact with air flowing in the horizontal direction inside the cooling tower main body 3. Thereby, heat is exchanged between the cooling water and the air, and the cooling water is cooled.

In the fan apparatus 1 shown in fig. 12 as well, similarly to the fan apparatus 1 shown in fig. 10, since the motor room 27 in which the motor 7 is housed and the inverter room 28 in which the inverter 8 is housed are formed by the motor case 17, the fan apparatus 1 can be provided in a compact form in which the inverter 8 and the motor 7 are unitized. Also, the heat transmitted from the motor 7 to the motor case 17 is removed from the motor case 17 by the air flowing on the outer surface of the motor case 17 by the rotation of the fan 5. The air flowing on the outer surface of the motor case 17 passes through the air flow passage 37 formed between the inner surface of the rectifying plate 45 and the outer surface of the end wall (i.e., the cover 40) of the motor case 17, and flows out of the vent hole 45b of the rectifying plate 45. The heat generated in the inverter 8 is carried away by the air passing through the air flow path 37. As a result, both the motor 7 and the inverter 8 can be cooled efficiently. In particular, since the rectifying plate 45 has the inclined portion 45c, the flow rate of the air flowing through the air flow passage 37 is increased, and the inverter 8 can be cooled more efficiently.

Similarly to the fan apparatus 1 described with reference to fig. 10, the fan apparatus 1 shown in fig. 12 may have a bearing housing 67 disposed between the motor 7 and the upstream bearing 36 so as to cover the upstream bearing 36, or may have a shaft seal 70 for sealing a gap between the rotary shaft 6 and the motor housing 17. Further, similarly to the fan apparatus 1 described with reference to fig. 9, the fan apparatus 1 shown in fig. 12 may have a plurality of motor fins 60 provided on the side wall 17b of the motor case 17, or may further have a pipe member 62 surrounding the side wall 17b of the motor case 17 at a distance therefrom.

As described with reference to fig. 10 to 12, the fan device 1 can be disposed in various spaces, and the installation angle of the fan device 1 (i.e., the direction of the air flow generated by the fan 5) can be arbitrarily set. Therefore, the fan apparatus 1 of the present invention can be applied to various uses.

The above embodiments are described for the purpose of enabling those skilled in the art to practice the present invention. As long as the person skilled in the art can naturally carry out various modifications of the above-described embodiments, the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the embodiments described above, and should be accorded the widest scope consistent with the technical ideas defined by the claims.

Industrial applicability

The present invention is applicable to a fan device for transferring gas.

Description of the reference numerals

1 Fan device

2 filling material

3 cooling tower body

5 Fan

6 rotating shaft

7 electric motor

8 frequency converter

10 introducing pipe

11 drainage pipe

12 water tank

14 wing

15 shutter

16 hub

17 electric motor shell

18 Fan case

20 coil pipe

22 sprinkler pipe

25 sprinkling discharge pipe

27 electric motor chamber

28 frequency converter chamber

29 partition wall

30 cooling water pipe

32 radiator body

33 frame body

35 upper side bearing

36 lower bearing

37 air flow path

40 cover

41 permanent magnet

42 power supply cable

43 rotor

44 stator

45 rectifying plate

46 electric motor cable

47 stator core

48 coil

49 frequency converter radiating fin

50 power element

51 control part

58 resin

60 motor radiator

62 pipe component

63 air flow path

66 cover plate

67 bearing cage

70 shaft seal

71 rotating part

72 base part

73 projection

75 static part

77 concave part

Claims

1. A fan apparatus, comprising:

an electric motor;

a fan fixed to a rotating shaft of the motor;

an inverter capable of changing the speed of the motor;

a motor housing having a motor chamber for housing the motor and an inverter chamber for housing the inverter; and

a rectifying plate disposed close to an end wall of the motor case constituting the inverter chamber and having a width larger than a width of the motor case,

the motor is located between the frequency converter and the fan,

the rectifying plate is provided with a vent hole.

2. The fan apparatus as claimed in claim 1,

the vent hole is formed in a central portion of the rectifying plate.

3. The fan apparatus as claimed in claim 1 or 2,

the flow regulating plate is provided with an inclined portion inclined toward the outer peripheral edge of the flow regulating plate and the fan.

4. The fan apparatus as claimed in claim 1 or 2,

and a frequency converter heat sink provided on the end wall.

5. The fan apparatus as claimed in claim 1 or 2,

the frequency converter has a power element in contact with an inner surface of the end wall.

6. The fan apparatus as claimed in claim 1 or 2,

having motor fins provided on a side wall of the motor case.

7. The fan apparatus as claimed in claim 1 or 2,

there is also a tube member surrounding the side wall of the motor housing at a spaced apart interval therefrom,

the pipe member is formed with an enlarged portion that is enlarged outward toward the fan.

8. The fan apparatus as claimed in claim 1 or 2,

the coils of the stator of the motor are covered with resin.

9. The fan apparatus as claimed in claim 1 or 2,

the motor is a permanent magnet motor in which a permanent magnet is disposed on a rotor.

10. The fan apparatus as claimed in claim 9,

the permanent magnet motor is a built-in permanent magnet motor in which a permanent magnet is arranged inside a rotor.

11. The fan apparatus as claimed in claim 10,

the interior permanent magnet motor has cover plates that cover both end surfaces of the rotor, respectively.

12. The fan apparatus as claimed in claim 1 or 2, further comprising:

a bearing rotatably supporting the rotating shaft; and

a bearing housing covering the bearing, the bearing housing,

the bearing housing is disposed between the motor and the bearing.

13. The fan apparatus as claimed in claim 1 or 2,

further comprising a shaft seal disposed in a shaft insertion portion through which the rotating shaft is inserted into the motor housing, the shaft seal sealing a gap between the rotating shaft and the motor housing,

the shaft seal has:

a rotary member having a disk-shaped base fixed to an outer peripheral surface of the rotary shaft, and a cylindrical protruding portion extending from the base toward the motor housing; and

and a stationary member fixed to the shaft insertion portion and having a recess formed therein so as to surround the protrusion.

14. The fan apparatus as claimed in claim 13,

the recess has a 1 st side surface facing the outer peripheral surface of the protrusion and a 2 nd side surface facing the inner peripheral surface of the protrusion,

a lip contacting the 2 nd side surface is provided on an inner peripheral surface of the protruding portion.