JP3937504B2 - Electric blower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric blower used for a hand drying device for drying hands with wind after washing hands with water in a bathroom, toilet, kitchen or the like.
[0002]
[Prior art]
Conventionally, various types of electric blowers have been used for hand dryers. Among them, there is an electric blower having a configuration as shown in FIG. 6 as a typical one, and FIG. 7 shows a hand dryer using this. There is something to show.
[0003]
In FIG. 6, the fan case 1 is attached to a motor frame 5 of a motor 4 with a blower impeller 2, an air guide 3 and the like provided therein. A large number of discharge holes 6 are formed in the side wall of the fan case 1. A cooling propeller 7 for cooling the motor 4 is attached to the motor shaft 8 on the opposite side of the air impeller of the motor 4. Reference numeral 9 denotes a motor cover that covers the motor 4, and an intake port 10 and an exhaust port 11 are provided on a side surface thereof. The intake port 10 and the exhaust port 11 communicate with the outside through the outer wall surface of the hand dryer. In FIG. 7, 12 is a drying chamber, 14 is a spout, 15 is an inlet, and 16 is a return passage.
[0004]
In these configurations, the wet hand 17 is inserted into the drying chamber 12 and has a function of blowing the moisture of the wet hand 17 by a jet flow from the jet port 14 and drying it. The airflow after blowing off the moisture returns from the intake port 15 through the reflux passage 16 and below the fan case 1. At this time, the blower impeller 2 is rotated at high speed by the motor 4. The air flow is generated, and the air flow is discharged from the discharge hole 6 of the fan case 1 and sent to the ejection port 14 to contribute to the drying of the wet hands.
[0005]
At the same time, inside the motor cover 9, the cooling propeller 7 rotates to suck cooling air from the outside through the air inlet 10 to cool the motor 4 and discharge it to the outside through the air outlet 11 to prevent overheating of the motor 4. Yes. The motor cover 10 prevents moisture discharged from the discharge airflow from the discharge hole 6 after passing through the impeller 2 after passing through the reflux path 16 from coming into contact with the charging portion of the motor 4.
[0006]
[Problems to be solved by the invention]
In the conventional electric blower, the cooling propeller 7 is provided for cooling. This is a factor of efficiency reduction because electric power is required to rotate the propeller 7, the propeller 7 is necessary, the motor shaft 8 needs to be lengthened, and the propeller described above. For example, the number of steps for attaching 7 to the motor shaft 8 is required, which is a major factor in increasing the cost.
[0007]
As described above, the conventional ones have a problem that the blowing efficiency is low and that the cost is high, but in the present invention, even an electric blower that handles air containing moisture, An object of the present invention is to provide an electric blower having a configuration that is highly efficient and does not increase the cost.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is configured such that the motor cover that covers the motor is made of a good heat conductor, and the discharge air from the impeller does not flow into the winding portion inside the motor. In addition to being able to handle air containing air, it is cooled via the motor cover when the temperature in the motor rises, so the cooling propeller, the intake port and the exhaust port for flowing the cooling air as before are the motor Since it is not provided on the cover, a low-cost and highly efficient electric blower can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention is an impeller that rotates at high speed, a motor for rotating the impeller, a fan case that covers the impeller and has a plurality of discharge holes on its side surface, and a bottomed cylindrical shape. and consists of a material having good thermal conductivity consists of a motor cover which covers the motor, the opening of the motor cover, the gap without mounting Rukoto to the frame of the motor for holding the fan casing, the said motor A convection space for heat generated from the motor is provided in a sealed state between the motor cover and the air discharged from the impeller is discharged to the outside only from the discharge hole of the fan case. This configuration does not flow in. With this configuration, it is possible to handle air containing moisture, and the motor cover is removed when the temperature inside the motor rises. Therefore, a cooling propeller is not required as in the prior art, the air blowing efficiency can be improved, and the motor cover is not provided with an intake port and an exhaust port for flowing air for cooling the motor. , Cost reduction and assembly can be improved.
[0010]
The invention according to claim 2 of the present invention is such that a plurality of donut-shaped heat radiation fins are projected on the outer peripheral surface of the motor cover covering the motor from the surface to the outside, and the heat radiation area is provided by the heat radiation fins. The cooling efficiency can be increased.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
Example 1
FIG. 1 is an external perspective view showing the configuration of the electric blower of this embodiment. In the figure, 18 is a fan case, and a plurality of discharge holes 19 are formed on the side thereof, and an impeller, an air guide, etc. (these are not shown) are accommodated in the inside, and 20 is Reference numeral 21 denotes a suction port, and reference numeral 21 denotes a motor. Around the motor 21, a bottomed cylindrical motor cover 22 made of a good heat conductor, preferably aluminum, is provided. The motor cover 22 is attached to the frame 23 of the motor 21 without any gap, and the discharge air from the impeller is discharged only from the discharge hole 19 of the fan case 18 to the outside and does not flow into the winding part inside the motor 21. Yes.
[0013]
The operation of the present embodiment in the above configuration will be described below. Due to the action of the motor 21, the impeller rotates to generate wind, and the air current including the moisture after the moisture on the surface of the wet hand is blown off from the suction port 20 of the fan case is sucked. Is discharged from the discharge hole 19 of the fan case 18. At this time, the motor generates heat, but this heat is transmitted to the motor cover 22 having good heat conduction characteristics by the convection action inside the motor cover 22. Then, due to the good heat conduction characteristic, the air flow from the discharge hole 19 is gradually cooled.
[0014]
As shown above, in the present embodiment, the air containing moisture is safe without touching the charged portion of the motor 21, and a cooling propeller is not required as in the prior art. The air blowing efficiency can be increased, and the assemblability is also improved.
[0015]
(Example 2)
Next, a second embodiment of the present invention will be described. In FIG. 2, reference numeral 23 denotes a fan case, which has a plurality of discharge holes 24 formed on its side surface, in which an impeller, an air guide, etc. (these are not shown) are housed. Is a suction port, and 26 is a motor. Around the motor 26 is provided a motor cover 28 having a plurality of donut-shaped fins 27 on a bottomed cylindrical body made of a good heat conductor, preferably aluminum. The motor cover 28 is attached to the frame 29 of the motor 26 without any gap, and is discharged only from the discharge hole 24 of the fan case 23 to the outside and does not flow into the winding portion inside the motor 26.
[0016]
The operation of the present embodiment in the above configuration will be described below. Due to the action of the motor 26, the impeller rotates to generate wind, and the air current including the moisture after the moisture on the surface of the wet hand is blown off from the suction port 25 of the fan case 23 is sucked. It passes through the inside and is discharged from the discharge hole 24 of the fan case 23. At this time, the motor generates heat, but this heat is transferred to the motor cover 28 having good heat conduction characteristics by the convection action inside the motor cover 28. Then, due to the good heat conduction characteristic, the air flow from the discharge hole 26 is gradually cooled.
[0017]
As described above, in this embodiment, the air containing moisture does not touch the charging part of the motor 26, and safe and efficient cooling is realized at a low cost. The heat dissipation area of the motor cover 28 is increased by the fins 27, and the cooling effect is enhanced.
[0018]
(Example 3)
Next, a third embodiment of the present invention will be described. In FIG. 3, reference numeral 30 denotes a fan case, which has a plurality of discharge holes 31 formed on its side surface, in which an impeller, an air guide, etc. (these are not shown) are housed. Is a suction port, and 33 is a motor. Around the motor 33, there is provided a substantially cylindrical motor cover 34 made of a good heat conductor, preferably aluminum. The motor cover 34 has one end in contact with the shaft end of the motor 33 via a heat conductor 35, preferably an aluminum heat transfer rod 35, and the other end attached to the motor frame 36 without a gap. The fan case 30 is discharged to the outside only from the discharge hole 31 and does not flow into the winding portion inside the motor 33.
[0019]
The operation of the present embodiment in the above configuration will be described below. Due to the action of the motor 33, the impeller rotates to generate wind, and the air current containing moisture after the moisture on the surface of the wet hand is blown off from the suction port 32 of the fan case is sucked. Through the discharge hole 31 of the fan case 30. At this time, although the motor 33 generates heat, the heat of the motor 33 is transferred to the motor cover 34 having good heat conduction characteristics by the convection action and the heat transfer rod 35 inside the motor cover 34. Become. Then, due to the good thermal conductivity characteristics, the air flow from the discharge holes 31 is gradually cooled. In particular, due to the action of the heat transfer rod 35, the heat of the motor 33 can be quickly transmitted to the motor cover 34, and the cooling performance is enhanced.
[0020]
As described above, in the present embodiment, the air containing moisture does not touch the charging portion of the motor 33, and safe and efficient cooling is realized at a low cost.
[0021]
Example 4
Next, a fourth embodiment of the present invention will be described. In FIG. 4, reference numeral 37 denotes a fan case, and a plurality of discharge holes 38 are formed on the side surface. Reference numeral 39 denotes a motor cover, and the motor cover 39 is formed of a member having a good heat conduction characteristic as in each of the embodiments described above. A heat conduction member, preferably a heat conduction plate 41 made of a plate material, extends from the circuit unit 40 in contact with a part of the motor cover. Reference numeral 42 denotes a main body of the hand dryer, 43 is a drying chamber, 44 is an intake port, 45 is a return passage, and 46 is a jet blowout nozzle. Reference numeral 47 denotes a wet hand to be dried.
[0022]
In these configurations, the wet hands 47 are inserted into the drying chamber 43, and the surface moisture is blown off by the jet flow from the jet nozzle 46 and dried. The airflow after blowing off the moisture returns from the intake port 44 through the return passage 45 to the suction port of the fan case 37 (on the side opposite to the circuit unit 40), passes through the fan case 37, It becomes a discharge flow from the discharge hole 38 and is discharged. The motor generates heat inside the motor cover 39, and this heat is transmitted to the motor cover 39 by convection. The heat from the circuit unit 40 is also transmitted to the motor cover 39 via the heat conducting plate 41, and the motor cover 39 is heated by these heats. However, at this time, since the motor cover 39 is made of a good heat conductive material, the heat is efficiently released by the contact with the discharge flow from the discharge hole 38, and the whole is cooled.
[0023]
As described above, in the present embodiment, the air containing moisture is safe without touching the charging part of the motor (not shown) inside the motor cover 39, and the circuit unit 40 is cooled at the same time. In addition, efficient cooling is realized at low cost.
[0024]
(Example 5)
Next, a fifth embodiment of the present invention will be described. In FIG. 5, reference numeral 48 denotes a fan case, which has a plurality of discharge holes 49 formed on its side surface, in which an impeller, an air guide, etc. (these are not shown) are accommodated. Is a suction port, and 51 is a motor. Around the motor 51, there is provided a motor cover 53 having a plurality of donut-shaped fins 52 on a substantially cylindrical body made of a good heat conductor, preferably aluminum. The motor cover 53 is attached to the frame 54 of the motor 51 without a gap. A guide cover 55 is provided to cover the fan case 48 and the motor cover 53, and a discharge port 56 is opened in the guide cover 55.
[0025]
The operation of the present embodiment in the above configuration will be described below. Due to the action of the motor 51, the impeller rotates to generate wind, and an air current containing moisture after the moisture on the surface of the wet hand is blown off from the suction port 50 of the fan case is sucked. And is discharged from the discharge hole 49 of the fan case 48. At this time, the motor generates heat, but the heat of the motor is transferred to the motor cover 53 having good heat conduction characteristics by the convection action inside the motor cover 53. The heat transfer to the surface occurs due to the good heat conduction characteristics combined with the 52 fins. At this time, since the discharge airflow from the discharge hole 49 fills the guide cover 55, it is discharged from the discharge port 56 while taking heat from the entire surface of the motor cover 53.
[0026]
As described above, in the present embodiment, safe and efficient cooling is realized without the air containing moisture touching the charging portion of the motor 51. Further, since the motor cover 53 is covered with the guide cover 55, most of the discharge airflow from the discharge holes 49 can contribute to cooling of the motor cover 53, and the cooling efficiency can be improved. Furthermore, the guide cover 53 is tapered so that the diameter increases as the distance from the discharge hole 49 increases, so that the motor cover 53 at a position away from the discharge hole 49 can also be efficiently cooled.
[0027]
【The invention's effect】
As apparent from the above embodiment, according to the first aspect of the present invention, the motor cover includes a motor cover that covers the motor and is made of a material having a bottomed cylindrical shape and good thermal conductivity, and an opening of the motor cover . and by the frame in the gap without mounting Rukoto of the motor for holding the fan case, by providing a convection space heat generated from the motor between the motor cover and the motor in a closed state, including moisture Air can be handled, and when the temperature in the motor rises, it is cooled via the motor cover, so that a cooling propeller is not required as in the conventional case, and the air blowing efficiency can be increased. The motor cover is not provided with an air intake port and an air exhaust port that allow the air to flow, so that it is possible to reduce costs and improve assembly. .
[0028]
Further, as in the invention described in claim 2, by providing a plurality of donut-shaped fins on the outer peripheral surface of the motor cover, the heat radiation area can be increased and the cooling efficiency can be enhanced. .
[Brief description of the drawings]
FIG. 1 is an external perspective view showing the inside of an electric blower showing a first embodiment of the present invention. FIG. 2 is an external perspective view showing an inside of an electric blower showing a second embodiment of the present invention. FIG. 4 is a perspective view of the exterior of the electric blower according to the third embodiment of the present invention. FIG. 4 is a perspective view of the exterior of the hand dryer using the electric blower according to the fourth embodiment of the present invention. FIG. 5 is an external perspective view showing the interior of an electric blower according to a fifth embodiment of the present invention. FIG. 6 is a partially cutaway side view of a conventional electric blower. FIG. 7 uses a conventional electric blower. External perspective view of the inside of the hand dryer [Explanation of symbols]
18 Fan case 19 Discharge hole 21 Motor 22 Motor cover 27 Fin 28 Motor cover 33 Motor 34 Motor cover 39 Motor cover 40 Circuit unit 41 Heat conduction plate (heat conduction member)
48 Fan case 49 Discharge hole 52 Fin 53 Motor cover 55 Guide cover 56 Discharge port

Claims (2)

An impeller which rotates at high speed, and a motor for rotating it, a fan casing having a plurality of discharge holes on the side surface covering said impeller, said formed of a material having good bottomed cylinder a and thermal conductivity It consists of a motor cover for covering the motor, an opening of the motor cover, the gap without mounting Rukoto to the frame of the motor for holding the fan case, generated from the motor between the motor cover and the motor An electric blower having a structure in which a convection space for heat is provided in a sealed state, and discharge air from the impeller is discharged only from a discharge hole of the fan case to the outside and does not flow into a winding portion inside the motor.   The electric blower according to claim 1, wherein the outer surface of the motor cover has a plurality of donut-shaped fins protruding outward from the motor cover.

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