JPH0735953U - Hot air generator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a warm air generator that is quiet and that heat generated from a control unit is effectively used to heat intake air. A blower fan, a drive source for the blower fan, a heating element, a control unit, and a casing that accommodates these are provided, and an air intake port and an air blowout port are formed in the casing. A metallic porous material is fixed around at least one of the drive source, the heating element, and the controller.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a warm air generator such as a hand dryer or an air conditioner.

[0002]

[Prior art]

 A warm air generator generally includes a blower fan, a drive source for the blower fan, a heating element, a control unit, and a casing that houses these, and an air inlet and an air outlet are formed in the casing. Has been done. The heat generated from the control unit is released into the casing via the heat sink.

[0003]

[Problems to be solved by the device]

 In the warm air generator, conventionally, no sound absorbing material was placed inside the casing, so the vibration noise of the motor that is the drive source of the blower fan, the wind noise of the blower fan, and the air generated by the heating element (heater). There was a problem that wind noise when passing through the room leaked to the outside through the casing, increasing the noise level in the room. As a solution to the above problem, it is conceivable to arrange glass wool having excellent sound absorbing effect in the casing. However, since glass wool has a small heat radiating effect, there is a risk that the control unit will overheat and break down. Moreover, the heat release from the heat sink to the casing is blocked by the glass wool, and the heat generated from the control unit cannot be effectively used for heating the intake air. May have adverse effects. The present invention has been made in view of the above problems, and an object of the present invention is to provide a quiet air generating device in which heat generated from a control unit is effectively used for heating intake air.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention includes a blower fan, a drive source for the blower fan, a heating element, a control unit, and a casing that houses these, and the casing has an air intake port and an air intake port. A hot air generating device is provided, in which a blowout port is formed, and a metallic porous material is fixed around at least one of a drive source, a heating element, and a control unit of the blower fan. In a preferred aspect of the present invention, the metal-based porous material is an aluminum-based porous material. In another preferred aspect of the present invention, the metallic porous material is fixed to substantially the entire inner surface of the casing. In another preferred aspect of the present invention, the metal-based porous material is formed in a corrugated shape. In another preferred embodiment of the present invention, the blower fan is a multi-layer disc fan, and the hand is dried by the blown warm air. In another preferred aspect of the present invention, the control unit and the drive source of the blower fan are arranged on the way of the intake passage between the air intake port and the intake unit of the blower fan.

[0005]

[Action]

 In the present invention, the metal-based porous material, which is attached to the heat-generating part such as the blower fan drive source and has excellent sound absorption effect, makes the motor vibration noise, the blower fan wind noise, and the air heat the heating element (heater). It absorbs wind noise when passing and prevents these noises from leaking out of the casing. Since the metal-based porous material has an excellent heat dissipation effect, the heat generated from the control unit is efficiently released into the casing through the metal-based porous material to heat the intake air. That is, the heat generated by the controller is effectively used. In addition, it is possible to prevent the controller from overheating and failing. The heat generated from the blower fan drive source and the heat generated from the heating element (heater) are also efficiently discharged into the casing through the metal-based porous material, which has an excellent heat dissipation effect, to heat the intake air. By using the aluminum-based porous material as the metal-based porous material, the cost can be reduced as compared with the case of using another metal-based porous material. By fixing the metal-based porous material to almost the entire inner surface of the casing together with the heat-generating part such as the control part, it is possible to more effectively prevent the noise generated from the blower fan drive source from leaking to the outside of the casing. It enables a quieter operation of the wind generator. By corrugating the metal-based porous material, the work of attaching the metal-based porous material to the inner surface of the casing becomes easy, and the surface area of the porous material increases, so that the sound absorption and heat dissipation effects increase. . By using a multi-layer disc fan as the blower fan, the quietness of the warm air generator is further improved. Further, by using the present hot air generator as a device for drying the hands with the hot air blown out, a quiet and highly efficient hand dryer can be provided. By disposing the control unit and the drive source of the blower fan on the way of the intake passage between the air intake port and the suction unit of the blower fan, the heat generated by the control unit and the drive source of the blower fan are arranged. The generated heat is most effectively used as a heat source for heating intake air.

[0006]

【Example】

 An embodiment in which the present invention is embodied in a hand dryer will be described with reference to FIGS. As shown in FIG. 1 to FIG. 3, an impeller 11 having an annular plate-shaped fan blade 11a stacked at a distance from each other is provided with an intake port 12a formed facing the central opening of the impeller 11. A multi-layer disc fan 1 housed in a bottomed cylindrical case 12 having an exhaust port 12b formed opposite to the peripheral side of the impeller 11, and for driving the multi-layer disc fan 1 A DC brushless motor 2, a solid-state relay 3a and a power transistor 3b that form a part of a control unit for the DC brushless motor 2 are housed in a casing 4. In the case 12 of the multilayer disc fan 1, a sheath heater 5 is disposed as a heat source near the exhaust port 12b. The casing 4 is formed with a plurality of air inlets 4a facing the side surface of the DC brushless motor 2 and surrounds the exhaust port 12b of the multilayer disc fan 1 to form an air outlet 4b.

As shown by the double arrow in FIG. 2, in the hand dryer, the DC brushless motor 2 is reached from the air suction port 4b, and the DC brushless motor 2 is further connected to the solid state relay 3a which is a part of the control unit. The DC brushless motor 2, the solid-state relay 3a, the power transistor 3b, and the multi-layer disc fan 1 are arranged so that an intake passage extending to the intake port 12a of the multi-layer disc fan 1 via the power transistor 3b is formed. It is arranged. ,

As shown in FIGS. 1 and 2, in the sheath heater 5 and the DC brushless motor 2, a plurality of flat plate-shaped aluminum-based porous materials 6a having an opening in the center are fin-shaped as sound absorbing materials and heat radiating materials. It is fixed by external fitting. Further, a flat plate-shaped aluminum-based porous material 6b is fixed to the solid state relay 3a and the power transistor 3b which form a part of the control unit. The aluminum-based porous material 6b shields the solid-state relay 3a and the power transistor 3b from the intake passage, and the surface of the aluminum-based porous material 6b that is not fixed to the solid-state relay 3a and the power transistor 3b is the intake air passage. Exposed to the aisle. As shown in FIGS. 1 and 2, an aluminum-based porous material 6c is fixed to almost the entire inner surface of the casing 4 as a sound absorbing material and heat radiating material. As shown in FIG. 4, the aluminum-based porous material 6c has a corrugated shape and is fixed to the casing 4 with screws 7. As shown in FIGS. 1 and 2, a shield plate 8 that surrounds the intake port 12a of the multilayer disc fan 1 is provided between the open end of the case 12 and the aluminum-based porous material 6c that faces the open end. Has been done.

In the hand dryer according to this embodiment having the above-mentioned configuration, when a person extends his / her hand in front of the air outlet 4b, a sensor (not shown) recognizes the hand, and the DC brushless motor 2, and thus the multi-layer circle. The plate fan 1 is started and the heater 5 is energized. The air sucked into the casing 4 from the air suction port 4a flows along the intake passage indicated by the double arrow in FIG. 2, and more specifically, the DC brushless motor 2 and the aluminum that is fitted onto the DC brushless motor 2 are fitted. Flow through the porous porous material 6a, along the surface of the aluminum porous material 6b on the side not fixed to the solid state relay 3a and the power transistor 3b, and flow into the intake port 12a of the multilayer disc fan 1. . The air that has flowed into the intake port 12a of the multilayer disc fan 1 is driven radially outward by the fan blade 1a, and as shown by the double arrow in FIG. Flowing toward the sheath heater 5, passes through the sheath heater 5 and the aluminum-based porous material 6a fitted on the sheath heater 5, is heated by the sheath heater 5, and is blown out through the exhaust port 12b, and eventually the air outlet port 4b. The shield plate 8 ensures the inflow of intake air through the intake passage into the intake port 12a, and blocks the inflow of outside air through the intake passage into the intake port 12a. The warm air blown from the air outlet 4b hits the hand of a person to dry it.

In this hand dryer, a metallic porous material 6a fixed to the DC brushless motor 2 and the sheath heater 5, a solid-state relay 3a and a power transistor 3b forming a part of the control unit are provided. Since the adhered aluminum-based porous material 6b has excellent sound absorption, vibration noise of the DC brushless motor 2, wind noise of the multilayer disc fan 1, wind noise when air passes through the sheath heater 5, etc. The noise is absorbed by the quality materials 6a and 6b, and leakage of these noises to the outside of the casing 4 is prevented. Since the aluminum-based porous material 6a is fixed to the DC brushless motor 2 and the sheath heater 5 in a fin shape, the aluminum-based porous material 6a has a large contact area with the air and thus a large sound absorbing effect.

Since the aluminum-based porous material 6b has an excellent heat dissipation effect, the heat generated from the solid-state relay 3a and the power transistor 3b, which form part of the control unit, is efficiently transferred through the aluminum-based porous material 6b. The air is discharged into the casing 4 and heats the air in the casing 4. That is, the heat generated from the solid state relay 3a and the power transistor 3b forming a part of the control unit is effectively used. Further, it is possible to prevent the solid state relay 3a and the power transistor 3b, which form part of the control unit, from overheating and failing. The heat generated from the DC brushless motor 2 and the heat generated from the sheath heater 5 are also efficiently released into the casing 4 via the metal-based porous material 6a having an excellent heat dissipation effect, and heat the intake air. As described above, since the metal-based porous material 6a is fixed to the DC brushless motor 2 and the sheath heater 5 in a fin shape, the contact area with air is large and therefore the heat radiation effect is large. Even if a copper-based porous material or the like is used instead of the aluminum-based porous materials 6a and 6b used in the present hand dryer, the same sound absorption effect and heat dissipation effect as in the case of the aluminum-based porous material can be obtained. By using the aluminum-based multi-porous material, which is cheaper than other metal-based porous materials, the cost can be reduced as compared with the case of using the other metal-based porous material. As the aluminum-based porous material, various materials such as an aluminum sintered body, foamed aluminum, and fibrous processed aluminum can be used.

In this hand dryer, the aluminum brushes 6a and 6b are used for the heat generating parts such as the DC brushless motor 2, the sheath heater 5, the solid state relay 3a which constitutes a part of the control part, the power transistor 3b and the like. The aluminum-based porous material 6c is fixed to almost the entire inner surface of the casing 4, so that the vibration noise of the DC brushless motor 2, the wind noise of the multi-layer disc fan 1, and the air blow the sheath heater 5. Leakage such as wind noise when passing through the casing 4 is more effectively prevented. As a result, quieter operation of the hand dryer is possible. In this hand dryer, the aluminum-based porous material 6c fixed to the inner surface of the casing 4 is formed in a corrugated shape. Since it is generally necessary to mount the sound absorbing material at a predetermined distance from the outer wall, if a flat aluminum porous material is used, a member for separating the porous material from the outer wall is required. By using the molded aluminum-based porous material 6c, the above-mentioned member becomes unnecessary, and the work of attaching the aluminum-based porous material to the inner surface of the casing becomes easy. Further, by forming the aluminum-based porous material 6c into a corrugated shape, the surface area is increased and the sound absorbing and heat radiating effects are increased.

In this hand dryer, since the quiet multi-layer disk fan 1 is used, the hand dryer is more quiet than when using another blower fan such as a white fan. improves. In this hand dryer, a solid-state relay 3a and a power transistor 3b forming a part of a control unit are provided on the way of the intake passage between the air intake 4a and the intake 12a of the multilayer disc fan 1. Since the DC brushless motor 2 which is the drive source of the multi-layer disc fan is disposed, heat generated from the solid-state relay 3a and the power transistor 3b, which form part of the control unit, and the multi-layer disc fan. The heat generated from the DC brushless motor 2 that is the drive source is most effectively used as the heat source for heating the intake air.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above-described embodiment, the aluminum porous material 6a is fitted and fixed to the DC brushless motor 2 in a fin shape, but the aluminum porous material may be fixed to the entire outer peripheral surface of the DC brushless motor 2. Further, although the present invention is embodied as a hand dryer in the above-described embodiments, the present invention may be applied to other warm air generators such as an air conditioner.

[0015]

【effect】

 As described above, in the present invention, the metallic porous material, which is fixed to the heat-generating part such as the blower fan drive source and has an excellent sound absorbing effect, is the vibration noise of the motor, the blowing noise of the blower fan, and the air is the heating element. It absorbs wind noise when passing through (heater) and prevents these noises from leaking out of the casing. Since the metal-based porous material has an excellent heat dissipation effect, the heat generated from the control unit is efficiently released into the casing through the metal-based porous material to heat the intake air. That is, the heat generated by the controller is effectively used. In addition, it is possible to prevent the controller from overheating and failing. The heat generated from the blower fan drive source and the heat generated from the heating element (heater) are also efficiently discharged into the casing through the metal-based porous material, which has an excellent heat dissipation effect, to heat the intake air. By using the aluminum-based porous material as the metal-based porous material, the cost can be reduced as compared with the case of using another metal-based porous material. By fixing the metal-based porous material to almost the entire inner surface of the casing together with the heat-generating part such as the control part, it is possible to more effectively prevent the noise generated from the blower fan drive source from leaking to the outside of the casing. It enables a quieter operation of the wind generator. By corrugating the metal-based porous material, the work of attaching the metal-based porous material to the inner surface of the casing becomes easy, and the surface area of the porous material increases, so that the sound absorption and heat dissipation effects increase. . By using a multi-layer disc fan as the blower fan, the quietness of the warm air generator is further improved. Further, by using the present hot air generator as a device for drying the hands with the hot air blown out, a quiet and highly efficient hand dryer is provided. By disposing the control unit and the drive source of the blower fan on the way of the intake passage between the air intake port and the suction unit of the blower fan, the heat generated by the control unit and the drive source of the blower fan are arranged. The generated heat is most effectively used as a heat source for heating intake air.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a hand dryer according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line II-II in FIG.

3 is a view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view showing a shape and an attached state of an aluminum porous material.

[Explanation of symbols]

 1 Multi-layer Disc Fan 11 Impeller 11a Fan Blade 12 Case 12a Inlet 12b Exhaust 2 DC Brushless Motor 3a Solid State Relay 3b Power Transistor 4 Casing 4a Air Inlet 4b Air Outlet 5 Heaters 6a, 6b, 6c Aluminum-based Porous Material 7 Screw 8 Shielding plate

Front page continuation (72) Inventor Makoto Hatakeyama 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu City Togoku Kikai Co., Ltd. (72) Inventor Koichi Toyota 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu Equipment Co., Ltd.

Claims (6)

[Scope of utility model registration request] 1. A blower fan, and a drive source for the blower fan,
A heating element, a control unit, and a casing that accommodates these are provided, and an air inlet and an air outlet are formed in the casing. A warm air generator characterized in that a metal-based porous material is fixed to the periphery. 2. The warm air generator according to claim 1, wherein the metal-based porous material is an aluminum-based porous material. 3. The warm air generator according to claim 1, wherein the metal-based porous material is fixed to substantially the entire inner surface of the casing. 4. The warm air generator according to claim 1, wherein the metal-based porous material is formed in a corrugated shape. 5. The warm air generator according to claim 1, wherein the blower fan is a multi-layer disc fan, and the hand is dried with the blown warm air. 6. The control unit and the drive source of the blower fan are arranged on the way of the intake passage between the air intake port and the intake unit of the blower fan. The warm air generator according to any one of claims.