JP3981860B2 - Air transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conveyance device, and more particularly, to an air conveyance device suitable for conveying heated air.
[0002]
[Prior art]
Air heated by a solar heat collector installed or formed on a roof, for example, a solar heat collector installed or formed on a roof, is used for heating or hot water in a building. In order to prevent the performance of the fan motor from deteriorating due to the heat of the heated air and the shortening of its service life, the air from the heated air should not affect the fan motor as much as possible. In addition, it is necessary to suppress overheating of the fan motor.
[0003]
An air conveyance device for conveying such heated air is proposed in Japanese Utility Model Laid-Open No. 6-18858. In the air conveying device disclosed in Japanese Utility Model Publication No. 6-18858, a fan motor installed in a flow path through which heated air flows is secured inside so as not to hinder the rotation of the air supply impeller. The heat insulation case is enclosed, and further, a pipe line extending in the vertical direction with the heat insulation case as a center and communicating with a space inside the heat insulation case is provided. In this way, the heat insulation case surrounding the fan motor prevents the heat of the heated air flowing through the flow path of the air to be conveyed from affecting the fan motor. The fan motor is cooled by forming an air flow that flows into the case from the lower pipe and flows out from the upper pipe, thereby suppressing overheating of the fan motor.
[0004]
[Problems to be solved by the invention]
By the way, in an air conveyance device for conveying heated air, an air supply impeller disposed in a flow path of air to be conveyed, or a rotation shaft of a fan motor existing in the flow path of air to be conveyed. Parts and the like are exposed to heated air. For this reason, the heat of the heated air is transmitted to the fan motor bearing, rotor, etc. via the rotating shaft. If the fan motor bearing or rotor is heated by the heat transmitted through the rotating shaft, the life of the bearing will be shortened, or the rotor will move away from the rotating shaft due to the difference in thermal expansion coefficient between the rotor and rotating shaft. Problems such as disengagement and displacement occur, resulting in a decrease in motor performance and a shortened life. On the other hand, in the conventional air conveyance device as proposed in Japanese Utility Model Laid-Open No. 6-18858, overheating of the field winding due to heat around the motor and heat generation of the fan motor itself can be prevented. It is not possible to suppress heat transfer through the rotating shaft. As a result, it is not possible to sufficiently reduce the fan motor performance or shorten the service life, resulting in problems such as inability to obtain sufficient air transport capacity or the need to replace the fan motor. The reliability of the device may be reduced.
[0005]
The subject of this invention is improving the reliability of an air conveying apparatus.
[0006]
[Means for Solving the Problems]
An air conveying device according to the present invention includes a flow passage formed in a casing through which heated air flows, an air supply impeller that is installed in the flow passage and conveys air, and the air supply blade. A fan motor having a rotating shaft connected to a car , a heat-dissipating impeller attached to the rotating shaft of the fan motor, and a motor that is separated from the flow path by a heat insulating partition and encloses the fan motor and the heat-dissipating impeller The motor chamber has an inflow port through which air around the housing flows in and an outflow port through which the air in the motor chamber flows out. The outflow port is a heat insulating material through which the rotation shaft of the fan motor passes. the gap formed by the through holes formed in the partition wall and the rotation shaft is positioned on the upstream side of the air impeller of the flow path is formed, heat radiation impeller is formed of a heat conductive material capable Installed between the insulation partition and the fan motor A disc-shaped base that solves the above problems by become configured with a plurality of vanes radially arranged in the plane of the fan motor side of the base.
[0007]
With such a configuration, since the fan motor is in the motor chamber separated by the heat insulating partition and the flow path through which the heated air flows, the heat of the heated air flowing through the flow path is Not easily affected. Furthermore, while the motor chamber communicates with the outside of the air conveyance device via the inlet, it is at atmospheric pressure, whereas the air flow is more than the fan portion of the flow path through which the heated air flows. On the other hand, the pressure in the upstream portion becomes lower than the atmospheric pressure when the air supply impeller rotates. Since the motor chamber communicates with the upstream side of the flow path through which the heated air flows through the outlet, the air in the motor chamber flows into the flow path when the air supply impeller of the fan section rotates. The atmosphere flows into the motor chamber, and the fan motor is cooled by the atmosphere flowing into the motor chamber, so that the temperature rise of the field windings can be suppressed and the motor can be prevented from overheating.
[0008]
On the other hand, since the outflow port is formed in the vicinity of the portion where the rotating shaft of the heat insulating partition wall is inserted, the air flowing from the motor chamber to the flow path passes around the heat dissipating impeller. At this time, the air passing around the heat dissipating impeller is agitated by the rotation of the heat dissipating impeller, so that heat transmitted through the rotating shaft is radiated from the heat dissipating impeller into the air around the heat dissipating impeller. Is done. And the air heated by the heat radiation from the heat-dissipating impeller flows out into the flow path from the outlet of this room. Thus, the heat transmitted through the rotating shaft is radiated into the air flowing out from the heat-dissipating impeller to the flow path, so that the heat transmitted through the rotating shaft is not easily transmitted to the fan motor and is in contact with the rotating shaft. Heating of bearings and rotors can be suppressed. Therefore, the heat input to the fan motor from the outside of the fan motor and the heat input to the inside of the fan motor through the rotating shaft can be suppressed, and the performance reduction and shortening of the life of the fan motor can be suppressed. The reliability of the transfer device can be improved.
[0009]
Furthermore, if the outlet is configured to have a gap between the outer peripheral surface of the rotation shaft of the fan motor and the inner peripheral surface of the through hole through which the rotation shaft of the heat insulating partition wall is inserted, the air flowing from the motor chamber to the flow path The heat dissipation efficiency of the heat-dissipating impeller can be reduced by passing through the periphery of the heat-dissipating impeller more reliably and reducing the amount of air that flows from the outlet to the flow path while receiving little heat from the heat-dissipating impeller. Can be improved.
[0010]
Furthermore, the heat-dissipating impeller has a plurality of blades on one surface of a disk-shaped base, and is attached to the rotation shaft of the fan motor with the surface having the blades of the base facing the fan motor side. To do. With such a configuration, the surface of the base of the heat dissipating impeller and the surface of the partition wall through which the rotating shaft is inserted are brought as close as possible to have the base blade of the heat dissipating impeller. By narrowing the distance between the non-insulating surface and the surface of the heat insulating partition wall through which the rotating shaft is inserted, the space between the heat dissipating impeller and the surface of the heat insulating partition wall through which the rotating shaft is inserted is directed toward the outlet. Resistance to air flow can be increased. Thereby, since the quantity of the air which flows into a flow path from an outlet can be reduced more, hardly receiving the heat from a heat-dissipating impeller, it is preferable because heat dissipation efficiency from the heat-dissipating impeller can be further improved. .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of an air conveyance device to which the present invention is applied will be described with reference to FIGS. 1 and 4. FIG. 1 is a plan view showing a schematic configuration and operation of an air conveyance device to which the present invention is applied, with the central portion of the casing broken. FIG. 2 is a front view showing a schematic configuration and operation of an air conveyance device to which the present invention is applied, with the front panel of the housing removed. FIG. 3 is an enlarged view showing a fan motor portion installed in the motor chamber. FIG. 4 is an arrow view from the line IV-IV in FIG.
[0012]
As shown in FIGS. 1 and 2, the air transfer device of the present embodiment includes a housing 1, a suction port 3, a damper 5 on the suction port side, a heat exchanger 7, a fan unit 9, a motor chamber 11, and a fan motor. 13, the heat dissipating impeller 15, the air outlet 17, the air outlet side damper 19, and the like. The housing 1 is formed by assembling a panel made of a heat-resistant material, such as a steel plate, into a substantially rectangular parallelepiped bowl shape. One end of the housing 1 is a suction port 3, and the other end is a blowout port 17, and the space in the center of the housing 1 and the space in the blowout port 17 are an opening 20. It is partitioned off by a partition wall 21 having A heat exchanger 7, a fan unit 9, a motor chamber 11, and the like are housed in the center of the housing 1.
[0013]
The suction port portion 3 has suction ports 27 and 29 on the end surface 23 and the upper surface 25 of the housing 1, respectively. A damper 5 that closes one of the suction ports 27 and 29 is attached to the inside of the suction port portion 3. In the damper 5, a movable plate 33 having one side supported by a rotary shaft 32 of a damper motor 31 provided at an end surface 23 provided with suction ports 27, 29 and a corner portion of the upper surface 25 is disposed between the suction ports 27, 29. The flow path of the air that moves and sucks into the suction port 3 is selected. The blowout port portion 17 has blowout ports 39 and 41 on the end surface 35 and the upper surface 37 of the housing 1, respectively. A damper 19 that closes one of the blowout ports 39 and 41 is attached to the inside of the blowout port portion 17 in the same manner as the suction port portion 3. In the damper 19, a movable plate 45 supported on one side by a rotation shaft 44 of a damper motor 43 provided at a corner of the upper surface 37 and an end surface 35 provided with the blowing ports 39, 41 is disposed between the blowing ports 39, 41. The flow path of the air which moves and blows out from the blower outlet part 17 is selected. The movable plates 33 and 45 are formed by applying a rubber foam material as a sealing material on the surface of a heat-resistant material, for example, a steel plate.
[0014]
The heat exchanger 7 has a heat medium such as water flowing through a flow path formed of a material having a relatively high thermal conductivity, such as copper or aluminum, and an outer surface of the flow path. A heat medium such as water is heated by heat exchange with heated air passing between fins formed of a material having a relatively high thermal conductivity, such as aluminum. Such a heat exchanger 7 is installed in the form of partitioning the space in the suction port 3 and the space in the center in the housing 1 near the suction port 3 side of the central portion in the housing 1. The air flowing from the suction port 3 toward the blowout port 17 through the air flow path formed in the housing 1 flows through the heat exchanger 7.
[0015]
The fan unit 9 is a substantially drum-shaped multi-blade fan, that is, a sirocco fan having an impeller 47 having a large number of blades that are short in the radial direction and long in the axial direction, and sucks into the center of each of the opposing disk surfaces. A mouth 49 is formed, and a blowout port 51 is formed on a part of the circumferential surface. The air outlet 51 of the fan unit 9 is connected to an opening 20 formed in the partition wall 21 that partitions the central space of the housing 1 and the space in the air outlet 17. The fan portion 9 is formed of a heat resistant material such as a steel plate.
[0016]
The motor chamber 11 is provided on the front side of the central portion of the casing 1, and the rotation shaft 53 of the fan motor 13 contained in the motor chamber 11 extends from the front side of the casing 1 toward the back side. The end of the rotary shaft 53 is inserted into the fan unit 9 through the suction port 49 on the front side of the fan unit 9 and is connected to the impeller 47 in the fan unit 9. The motor chamber 11 is formed of a panel made of a heat-resistant material, for example, a steel plate, in the shape of a rectangular parallelepiped, and is a surface located inside the housing 1, that is, a surface facing the fan unit 9, and the heat exchanger 7. The panels constituting the surface facing the surface and the surface facing the partition wall 21 are covered with a heat insulating material to form heat insulating partition walls 55, 57 and 59, respectively. In addition, a heat insulation partition can also be formed by using the panel of a heat insulating material.
[0017]
As shown in FIG. 2, an inflow port 60 through which air around the housing 1, that is, the atmosphere flows, is formed in the upper and lower portions of the panel of the motor chamber 11 constituting the front surface of the housing 1. On the other hand, as shown in FIGS. 1 and 3, the heat insulating partition wall 55 is formed with a through hole through which the rotation shaft 53 of the fan motor 13 is inserted, and the inner peripheral surface of the through hole and the outer periphery of the rotation shaft 53. A gap between the two surfaces forms an outlet 61 for the air in the motor chamber 11 to flow out into the flow path in the housing 1. In the present embodiment, the through hole of the heat insulating partition wall 55 of about 18 mmφ is formed with respect to the rotating shaft 53 of about 15 mmφ, and the inner peripheral surface of the through hole of the heat insulating partition wall 55, which becomes the outlet 61, The gap between the outer peripheral surface is about 3 mm.
[0018]
As shown in FIGS. 3 and 4, the fan motor 13 includes a spacer 63 for forming a space between the heat insulating partition 55 and the fan motor 13 in the heat insulating partition 55 facing the fan portion 9 of the motor chamber 11. Is attached through. The spacer 63 is preferably a cylindrical member formed of a material having low thermal conductivity and elasticity, such as rubber. The four spacers 63 made of cylindrical members are respectively disposed at the four corners of the fan motor 13, and bolts 65 for fixing the fan motor 13 to the heat insulating partition wall 55 are inserted to fix the fan motor 13. At the same time, it is fixed between the fan motor 13 and the heat insulating partition wall 55.
[0019]
The heat-dissipating impeller 15 is a heat-conductive material and is formed of a material having a relatively high thermal conductivity, such as aluminum casting or press molding, and is provided on one side of a base 67 formed in a disk shape. Are provided with linear blades 69 extending radially at equal intervals in the radial direction. The end of the blade 69 on the rotating shaft 53 side is cut out obliquely so that the length of the blade 69 is longer on the base 67 side. The heat-dissipating impeller 15 is located between the fan motor 13 and the heat insulating partition 55 and is attached to the rotating shaft 53 of the fan motor 13 with the surface on which the blades 69 are formed facing the fan motor 13 side. The spacer 63 is such that the heat dissipating impeller 15 is rotatable, and the spacer 63 has such a width that the distance between the heat dissipating impeller 15 and the heat insulating partition 55 is as small as possible, for example, about 2 to 3 mm in this embodiment. It is formed in width.
[0020]
The operation of the air conveyance device having such a configuration and the features of the present invention will be described. In the air conveyance device of the present embodiment, one end of each duct (not shown) is connected to each of the suction ports 27 and 29 of the suction port portion 3, and each of the ducts is connected via each duct (not shown). Heated air, outside air, or the like can be selectively conveyed from, for example, a solar heat collector or an inlet of a building wall to which the other end is connected. In addition, one end of a duct (not shown) is also connected to the outlets 39 and 41 of the outlet 17, and the other end of each duct is connected via each duct (not shown). Heated air or outside air can be selectively supplied under the floor of a building or indoors. Here, a case where air heated by a solar heat collector (not shown) is conveyed will be described as an example.
[0021]
When the movable plate 33 of the damper 5 of the suction port 3 closes one of the suction ports 27 and 29, the suction port is selected. Further, when the movable plate 45 of the damper 43 of the blowout port portion 17 closes one of the blowout ports 39 and 41, the blowout port is selected. For example, as shown in FIGS. 1 and 2, the suction port 27 and the blowout port 39 are selected. When the fan motor 13 is driven and the air supply impeller 47 of the fan unit 9 rotates, the air heated by the solar heat collector (not shown) is sucked into the suction port 3 from the selected suction port 27. . The heated air sucked into the suction port 3 passes through the heat exchanger 7 and is sucked into the fan unit 9 from the suction ports 49 on both sides of the fan unit 9. The heated air sucked into the fan unit 9 is blown out from the blowout port 51 of the fan unit 9 into the blowout port unit 17, and from the selected blowout port 39 through the blowout port 39 and a duct (not shown). To the connected place.
[0022]
In addition, the space in the housing | casing 1 becomes a flow path through which the air to convey flows, and this flow path is divided into the upstream and downstream with respect to the flow of air by the partition 21 and the fan part 9. FIG. . That is, the space in the housing 1 from the suction port 3 to the partition wall 21 and the fan unit 9 in the center of the housing 1 is on the upstream side of the flow path, and the housing from the partition wall 21 and the fan unit 9 to the blowout port 39. The space in 1 is on the downstream side of the flow path.
[0023]
Here, the air heated by the solar heat collector may be at a high temperature of about 90 ° C., and the flow path in the housing 1 is exposed to such a high temperature. However, in the present embodiment, the fan motor 13 is installed in the motor chamber 11 separated from the air flow path heated by the heat insulating partition walls 55, 57, 59. Is not directly affected by the heat of the heated air. The motor chamber 11 is in an atmospheric pressure state because it communicates with the outside of the air conveyance device through the inlet 60, but the upstream side of the flow path in the housing 1 is for air supply of the fan unit 9. When the impeller 47 rotates, the pressure becomes lower than the atmospheric pressure. Therefore, since the motor chamber 11 communicates with the upstream side of the flow path in the housing 1 through the outlet 61, when the air supply impeller 47 of the fan unit 9 rotates, Air, that is, the atmosphere flows into the motor chamber 11, and an air flow in which the air in the motor chamber 11 flows out to the upstream side of the flow path in the housing 1 is generated. The atmosphere flows into the motor chamber 11, and the fan motor 13 in the motor chamber 11 is cooled from the outside by the flow of air that flows out of the air in the motor chamber 11 to the upstream side of the flow path in the housing 1. .
[0024]
On the other hand, the part located in the outer side of the motor chamber 11 of the rotating shaft 53 of the fan part 9 or the fan motor 13 is exposed to heated air. For this reason, the heat received by the fan unit 9 and the rotating shaft 53 may be transmitted to the fan motor 13 through the rotating shaft 53. However, in this embodiment, since the air flowing out from the motor chamber 11 passes around the heat dissipation impeller 15, the air is agitated by the rotation of the heat dissipation impeller 15, and the heat of the heat dissipation impeller 15 is It is radiated to the air flowing out from. Further, the air in the motor chamber 11 passes through a gap between the surface of the base 67 of the heat dissipating impeller 15 where the blades 69 are not formed and the inner surface of the heat insulating partition 55, and the rotation shaft 53 of the fan motor 13. Flows out from the outlet formed by the gap between the inner peripheral surface of the through hole of the heat insulating partition wall 55 and the outer peripheral surface of the rotary shaft 53 to the flow path in the housing 1. For this reason, the resistance to the air flow toward the outlet 61 is large, the amount of air flowing out from the motor chamber 11 without receiving heat from the radiating impeller 15 is reduced, and the air receiving heat radiated from the radiating impeller 15. The heat dissipation efficiency from the heat dissipation impeller 15 is improved.
[0025]
Thus, in the air conveyance device of the present embodiment, the fan motor 13 is in the motor chamber 11 separated from the flow path in the housing 1 by the heat insulating partition walls 55, 57, 59. Insensitive to the heat of heated air flowing through. Further, the fan motor 13 is cooled from the outside by the flow of the air flowing from the outside of the conveying device through the motor chamber 11 to the upstream side of the flow path in the housing 1, which is generated by the rotation of the air supply impeller 47. Thus, it is possible to prevent the fan motor 13 from being overheated by suppressing the temperature rise of the field winding of the fan motor 13. Furthermore, the air flowing from the motor chamber 11 to the flow path in the housing 1 passes around the heat dissipating impeller 15 and is agitated by the rotation of the heat dissipating impeller 15, so that the heat transmitted through the rotating shaft 53 is dissipated. Heat is radiated into the air around the impeller 15. For this reason, the heat transmitted through the rotating shaft 53 is dissipated before reaching the fan motor 13, and it is possible to suppress heating of the bearings and the rotor that are in contact with the rotating shaft 53 of the fan motor 13. Therefore, the heat of the heated air flowing through the flow path is prevented from being transmitted from the outside of the fan motor 13 to the fan motor 13 and to the inside of the fan motor 13 via the rotating shaft 53. Since performance degradation and shortening of the life can be suppressed, the reliability of the air transfer device can be improved.
[0026]
Further, the outlet 61 of the motor chamber 11 is a gap between the outer peripheral surface of the rotating shaft 53 of the fan motor 13 and the inner peripheral surface of the through hole through which the rotating shaft 53 of the heat insulating partition wall 55 is inserted. The air flowing from 11 to the flow path in the housing 1 passes through the periphery of the heat dissipating impeller 15 more reliably, and hardly receives heat from the heat dissipating impeller 15 from the outlet 61 to the inside of the housing 1. The amount of air flowing out into the flow path can be reduced, and the heat dissipation efficiency from the heat dissipation impeller 15 can be improved. Further, the step of forming the outlet in the motor chamber can be omitted. However, depending on the required heat dissipation efficiency, the outlet may be formed in the vicinity of the portion where the rotating shaft 53 of the heat insulating partition 55 is inserted, other than the outlet 61 of the present embodiment.
[0027]
In addition, since the heat dissipating impeller 15 is attached to the rotating shaft 53 with the surface of the base 67 having the blades 69 facing the fan motor 13, the heat dissipating impeller 15 has the blades 39 of the base 37 of the heat dissipating impeller 15. By reducing the gap between the non-circular surface and the inner surface of the heat insulating partition wall 55 through which the rotary shaft 53 is inserted as much as possible, the air flowing toward the outlet 61 through the space between the heat dissipating impeller 15 and the heat insulating partition wall 55 is reduced. The resistance to flow can be increased. As a result, the amount of air that flows from the outlet 61 to the flow path in the housing 1 can be further reduced with little heat dissipation from the heat dissipation impeller 15, and the heat dissipation efficiency from the heat dissipation impeller is further improved. can do.
[0028]
Furthermore, since the heating of the bearing in contact with the rotating shaft 53 of the fan motor 13 can be suppressed, the heat resistance performance required for the bearing of the fan motor 13 can be lowered, and the design of the bearing and magnet becomes easy. Cost can be reduced. In addition, since it is possible to suppress the heating of the bearing, it is not necessary to use high-temperature bearing oil that increases in viscosity at low temperatures, and the original performance can be obtained even when the temperature is low such as in winter, and it can be smoothly started Can be started.
[0029]
Further, since the heat of the air flowing through the housing 1 does not affect the fan motor 13, the durability and safety of the fan motor can be confirmed by a test performed at room temperature. Furthermore, since heating of the rotor, that is, the magnet that is in contact with the rotating shaft 53 of the fan motor 13 can be suppressed, there is no restriction on the thermal expansion coefficient of the magnet, and the degree of freedom in designing the magnet is increased. As a result, it is possible to use a magnet having a stronger magnetic flux, and the efficiency, size, cost, etc. of the fan motor used in the air conveyance device can be improved.
[0030]
Further, in the present embodiment, radiating impeller 15, a surface having a blade 69 of the base 67 toward the fan motor 13 side attached to the rotary shaft 53, a wing 6 9 of the base 6 7 radiating impeller 15 The space between the surface that does not have the inner surface of the heat insulating partition wall 55 through which the rotary shaft 53 is inserted can be made as narrow as possible. However, the edge of the surface of the heat dissipating impeller 1 that does not have the blades is bent toward the heat insulating partition through which the rotation shaft is inserted, or the surface of the heat dissipating impeller that does not have the blades of the base. Protrusions that protrude toward the surface of the heat insulating partition through which the rotating shaft is inserted are formed, and the air flow path between the heat dissipating impeller and the heat insulating partition 55 is narrowed to increase resistance to air flow. It can also be made. However, if it is the structure of this embodiment, the process of the impeller for heat radiation is easy.
[0031]
Further, in the present embodiment, the heat-dissipating impeller 15 is provided with linear blades 69 extending radially at equal intervals in the radial direction, but the heat-dissipating impeller is formed with a curved blade. For example, various shapes that can stir the air around the heat dissipating impeller can be used.
[0032]
In the present embodiment, a sirocco fan is used as the fan unit 9, but the fan unit 9 is not limited to this, and various fans such as an axial fan, a radial fan, and a centrifugal fan can be used. Furthermore, the air conveyance device of the present embodiment is configured to include the suction port 3, the damper 5 on the suction port side, the heat exchanger 7, the blower port 17, the damper 19 on the blow port, and the like. However, the present invention is not limited to the configuration of the present embodiment and the target air transport device, but can be applied to various configurations and target air transport devices.
[0033]
【The invention's effect】
According to the present invention, the reliability of the pneumatic conveyance device can be improved.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic configuration and operation of an embodiment of an air conveyance device to which the present invention is applied, with a central portion of a casing cut away.
FIG. 2 is a front view showing a schematic configuration and operation of an embodiment of an air conveyance device to which the present invention is applied, with a front panel of a housing removed.
FIG. 3 is an enlarged view showing a fan motor portion installed in a motor chamber.
4 is an arrow view taken along line IV-IV in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing | casing 9 Fan part 11 Motor chamber 13 Fan motor 15 Radiating impeller 47 Impeller 53 Rotating shaft 55, 57, 59 Heat insulation partition 60 Inlet 61 Outlet

Claims (1)

A flow path air heated are formed in the casing is flowing, the air impeller that conveys the air is installed in a flow path, the rotation shaft is connected to said transmission for air impeller a fan motor has a front Symbol radiating impeller attached to the rotating shaft of the fan motor, separated by a heat insulating partition wall from the flow path, and a motor chamber which encloses the fan motor and the heat radiating impeller,
The motor chamber has an inlet through which air around the housing flows in and an outlet through which the air in the motor chamber flows out, and the outlet is the heat insulating partition through which the rotation shaft of the fan motor passes. A gap formed by the through-hole formed in the rotary shaft and the rotary shaft is positioned on the upstream side of the air supply impeller of the flow path,
The heat-dissipating impeller is formed of a heat-conducting material, and is attached to a disk-shaped base that is positioned between the heat-insulating partition wall and the fan motor. An air conveyance device having a plurality of radially provided blades .

Images