JP5644731B2 - Hand dryer - Google Patents

Description

  The present invention relates to a hand dryer for drying wet hands after washing.

  2. Description of the Related Art Conventionally, there has been known a hand-drying device that incorporates an electric blower that uses a commutator motor as a drive source, generates hot air or high-speed air, and dries the hand by applying it to a wet hand. For example, in WO2009 / 047831, a high-pressure airflow generator is incorporated in the upper part of the main body case, a water receiving part is provided in the lower part of the main body case, and between the high-pressure airflow generating part and the water receiving part. A hand-drying device is disclosed that includes a hand insertion portion, a high-pressure airflow generation portion including a motor having a commutator and a brush, and a turbo fan that is rotationally driven by the motor.

WO 2009/047831 (paragraph “0053”, FIGS. 9 and 10)

  Since the commutator motor has a structure in which the brush is urged against the commutator by a spring or the like and is mechanically slid, the brush is worn as the commutator motor operates. Therefore, the life of the commutator motor depends on the length of the brush. Electric blowers that use commutator motors are commonly used in household vacuum cleaners, but the total number of operations required for the life of hand dryers that are used hundreds of times per day by an unspecified number of people. Since the time is several times longer than the vacuum cleaner for home use, in order to use the commutator motor in the hand dryer, it is necessary to extend the life of the commutator motor by extending the brush length several times. It was the form which the brush protruded largely outside from the outer shell. Therefore, a brush that protrudes when transferring an electric blower using a commutator motor assembled in a separate process from the hand dryer or when incorporating an electric blower using a commutator motor into the hand dryer The contact surface between the brush and the commutator will be displaced once it hits, causing a large amount of sparks due to contact abnormality, abnormal brush wear and rectification, and unstable power consumption. There were problems such as.

  Also, when installing the electric blower of the commutator motor into the hand dryer, the hand dryer device structure located around the brush should be spaced from the brush so that the brush is less likely to contact the hand dryer device structure. There is also a problem that the size of the hand-drying device is increased because it is necessary to separate the hand-drying device.

  The present invention has been made in order to solve the above-described problems, and is intended to improve the handling of the commutator motor and to obtain a hand-drying device with good assemblability.

  In addition, a compact hand dryer is obtained.

In the hand drying device according to the present invention, a hand insertion section having a width that allows a hand to be taken in and out, a nozzle that blows air toward the hand insertion section, and a commutator motor that sends air from the nozzle as a drive source A hand-drying device including an electric blower and a casing provided with the electric blower, and the commutator motor has a magnetic pole formed in an inner periphery of a frame forming an outer shell of the commutator motor. Stator, armature that is wound around the armature core and is rotatably disposed on the inner peripheral side of the stator, commutator to which the winding is connected, and brush that contacts the commutator A brush holder for penetrating the frame from the inside to the outside of the frame to hold the brush, a cover for covering the brush holder outside the frame, and a plurality of protruding hooks provided on the cover And the frame And a opening for discharging a plurality provided air, in which the hook portion for mounting the cover hook in the opening.

  The handling of the commutator motor can be improved, and a hand-drying apparatus with good assemblability can be obtained.

It is a perspective view which shows the external appearance of the hand dryer which concerns on Embodiment 1 of this invention. It is side surface sectional drawing of the hand dryer which concerns on Embodiment 1 of this invention. It is a perspective view of the electric blower 9 in the hand dryer according to Embodiment 1 of the present invention. It is a side view of the electric blower 9 in the hand dryer which concerns on Embodiment 1 of this invention. It is the electric blower 9 in the hand dryer which concerns on Embodiment 1 of this invention, and is side sectional drawing of the AA cross section of the electric blower 9 in FIG. It is a part of electric blower 9 in the hand dryer according to Embodiment 1 of the present invention, and is an enlarged partial plan sectional view of a P part in FIG. It is a perspective view of the state which removed the cover 29 of the electric blower 9 in the hand dryer which concerns on Embodiment 1 of this invention. It is explanatory drawing explaining the cover 29 and the sealing material 33 of the electric blower 9 in the hand dryer which concerns on Embodiment 1 of this invention.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing an appearance of a hand dryer according to Embodiment 1 of the present invention, and FIG. 2 is a side sectional view. As shown in FIGS. 1 and 2, the casing 1 forming the outer shell of the main body has a hand insertion port 2 on the front surface, and includes a hand insertion unit 3 as a processing space following the hand insertion port 2. The hand can be inserted and removed. The manual insertion portion 3 is formed as an open sink-like recess in which the front and both side surfaces are open at the front lower portion of the casing 1, and the water receiving portion 4 forming the lower portion and the back side have a curved surface configuration at the edge thereof. A barrier structure by standing up is provided so that water does not scatter to the side or the front. The bottom of the water receiving portion 4 is inclined downward toward the front, and a drain port 5 is provided at the lower end of the inclination. A drain container 6 for storing water dripping from the drain port 5 is provided below the water receiving portion 4 so as to be freely inserted and removed. A nozzle 7 that blows high-speed air downward toward the hand insertion portion 3 is provided above the hand insertion portion 3, and a hand detection that detects the presence or absence of the hand of the hand insertion portion 3 in the vicinity of the back side of the nozzle 7. A sensor 8 is provided. On both the left and right side surfaces of the casing 1 above the manual insertion portion 3, air inlets 12 for sucking outside air are provided.

  In the box-shaped space formed by the casing 1 and the base 11 that forms the outer shell of the main body on the back side above the manual insertion portion 3, an electric blower 9 that is a high-pressure airflow generator, and an electric blower 9 The intake air passage 13 that connects the intake side and the intake port 12, the exhaust air passage 14 that connects the exhaust side of the electric blower 9 and the nozzle 7, and the electric blower 9 according to the hand detection of the hand detection sensor 8. A control circuit (not shown) for operating is installed. In the middle of the intake air passage 13, a filter 15 for removing dust in the passing air is detachably provided. A heater 10 that heats the air sent from the electric blower 9 and warms it is provided in the vicinity of the upstream side of the blowout nozzle 7 in the middle of the exhaust air passage 14.

The operation when using the hand dryer will be described. When the user inserts a wet hand from the hand insertion port 2 into the hand insertion part 3 to the vicinity of the wrist, insertion of the hand is detected by the hand detection sensor 8 and the electric blower 9 is activated by processing of a control circuit (not shown). To do. When the electric blower 9 is activated, air outside the hand dryer is sucked from the air inlet 12. The air sucked from the air inlet 12 is sucked into the suction side of the electric blower 9 through the air intake air passage 13 after the dust in the air passing through the air intake air passage 13 and the filter 15 is removed. The electric blower 9 converts the air sucked from the intake side into high-pressure air and discharges it from the exhaust side of the electric blower 9. The discharged high-pressure air passes through the exhaust air passage 14 and has a high kinetic energy from the nozzle 7. And is blown downward into the hand insertion portion 3. The high-speed airflow blown out from the nozzle 7 hits the wet hand inserted in the hand insertion portion 3, and moisture attached to the hand can be peeled off from the surface of the hand and blown off to dry the hand. Further, by inserting and removing the hand in the hand insertion portion 3, water droplets adhering to the entire hand are eliminated, and the hand is dried. If the heater 10 is energized with a heater switch (not shown), the high-pressure air passing through the exhaust air passage 14 is heated, so that warm air is blown from the nozzle 7 to improve the usability in winter. Can do. When the hand is removed from the hand insertion portion 3 after the hand drying process is completed, the hand detection sensor 8 detects that the hand has been removed and the electric blower 9 stops. The water droplets blown from the hand flow down toward the drainage port 5 in the water receiving portion 4 having the forward tilt structure, and are stored in the drain container 6 from the drainage port 5.

Next, the details of the electric blower 9 will be described.
3 is a perspective view of the electric blower 9 in the hand dryer according to Embodiment 1 of the present invention, FIG. 4 is a side view of the electric blower 9, and FIG. 5 is a side cross-sectional view taken along the line AA of the electric blower 9 in FIG. FIG. As shown in FIGS. 3 to 5, the electric blower 9 includes a blower part (blower part) 9 </ b> A having a blower mechanism and an electric motor part (motor part) 9 </ b> B in which a commutator motor as a rotational drive source is arranged. Prepare. The blower unit 9A includes a centrifugal fan 27 provided at an end of the armature 23, and a fan guide 28 that covers the centrifugal fan 27 and has an opening at the center.

The electric motor portion 9B constituting the commutator motor includes a frame 21 forming an outer shell, a stator 22 having a magnetic pole formed in the inner peripheral portion thereof, and an inner peripheral portion side of the stator 22. An armature 23 that is movably arranged and wound around an armature core, and a commutator 24 that is connected to the winding wound around the armature core of the armature 23 are provided. Further, a metallic cylindrical brush holder 26 that passes through the frame 21 from the vicinity of the commutator 24 and extends from the inside of the frame 21 to the outside of the frame 21, and is held inside the cylinder of the brush holder 26. A substantially square pillar carbon brush 25, which is biased by a coil spring (not shown) and mechanically slidably contacted with the surface of the commutator 24, sandwiches the commutator 24 outside the commutator 24. There are two on the left and right. Since the brush holder 26 becomes an energizing portion when power is supplied to the electric blower 9, it is fixed to the frame 21 via a resin and is electrically insulated from the frame 21. Further, the frame 21 is provided with a plurality of substantially rectangular openings 21 a that serve as exhaust ports for exhausting air inside the frame 21.

FIG. 6 is a part of the electric blower 9 in the hand dryer according to Embodiment 1 of the present invention, and is an enlarged partial plan sectional view of part P in FIG. FIG. 7 is a perspective view showing a state where the cover 29 of the electric blower 9 in the hand dryer according to the first embodiment of the present invention is removed. FIG. 8 is an explanatory view for explaining the cover 29 and the sealing material 33 of the electric blower 9 in the hand dryer according to Embodiment 1 of the present invention. As shown in FIGS. 6 to 8, outside the frame 21, metallic power supply terminal portions 30 are electrically insulated from the frame 21 in the vicinity of the left and right brush holders 26 via resin, respectively. It is fixed to. One power supply terminal portion 30 and the other power supply terminal portion 30 provided on the left and right sides are a stator 22 winding (not shown), an armature 23 winding (not shown), a commutator 24 and When the electric blower 9 is electrically connected via the carbon brush 25 and power is supplied to the electric blower 9, it becomes an energizing portion.

Covers 29 are respectively attached to the left and right sides of the frame 21 so as to cover the brush holder 26 and the power supply terminal portion 30 protruding outside the frame 21. More specifically, when the cover 29 is attached to the frame 21, the cover 29 has a concave shape so as to accommodate the brush holder 26 and the power supply terminal portion 30 protruding to the outside of the frame 21, and has a heat resistant temperature such as PPS, PET, or PBT. Made of a relatively high thermoplastic resin material. A part of the concave outer peripheral edge 29 a of the cover 29 is provided with arm portions 31 and 32 projecting in the concave opening direction integrally with the cover 29. At the tip of the arm portion 31, there is provided a protruding hook portion 31a that protrudes outward at approximately 90 ° with respect to the protruding direction of the arm portion 31, and at the tip of the arm portion 32, what is the protruding direction of the arm portion 32? A protrusion-like hooking portion 32a that protrudes inward at approximately 90 ° is provided. When the arm portions 31 and 32 are inserted into the opening portion 21 a of the frame 21, the hook portions 31 a and 32 a of the arm portions 31 and 32 are hooked on the opening edge of the opening portion 21 a and the cover 29 is fixed to the frame 21. The cover 29 can be removed by removing the hooks 31 a and 32 a, and the cover 29 is detachably attached to the frame 21.

A sealing material 33 is sandwiched between the frame 21 and the concave outer peripheral edge 29a of the cover 29 over the entire periphery of the outer peripheral edge 29a, and the outer peripheral edge of the cover 29 is obtained by hooking the hooking portion 31a and the hooking portion 32a onto the opening 21a. The sealing material 33 is compressed over the entire circumference of 29a, and the cover 29 is mounted so that there is no gap between the frame 21 and the outer peripheral edge 29a. Accordingly, the concave interior of the cover 29 is sealed with the frame 21, the cover 29, and the sealing material 33, and the brush holder 26 and the power terminal portion 30 projecting outside the frame 21 housed in the concave interior of the cover 29 are provided. The energization part and the space outside the cover 29 are isolated and blocked. The sealing material 33 is formed of an elastic material so that it can be deformed when pressed by the cover 26, and is formed of a rubber material having high heat resistance such as NBR rubber to which a flame retardant is added, silicon rubber, or fluorine rubber, for example.

The cover 20 and the sealing material 33 are attached by placing the sealing material 33 on the frame 21, passing the arm portion 31 of the cover 29 through the hole of the sealing material 33, and hooking the hook portion 31 a on the opening edge of the opening portion 21 a, While rotating with the hook 31a as a fulcrum, the other arm 32 is inserted into another opening 21a and the hook 32a is hooked on the opening edge.

As shown in FIG. 8, the seal material 33 is connected to a power terminal portion 30 and a control circuit (not shown), and a lead wire 34 for supplying power to the power terminal portion 30 is pulled out of the cover 29. A through hole 33a is provided, and a slit 33b having a notch shape is provided for passing the lead wire through the through hole 33a. On the outside of the frame 21, one of the two lead wires 34 coming out of the respective covers 29 melts when the temperature of the frame 21 becomes high when the armature 23 is restrained, and the power supply terminal portion A thermal fuse 34 for interrupting the supply of power to 30 and preventing the motor part (motor part) 9B from becoming hot and being damaged is connected midway. The thermal fuse 34 is attached to the outer surface of the frame 21 by a fixing member 35.

  Next, the air flow of the electric blower 9 will be described. When power is supplied to the power supply terminal portion 30, the armature 23 rotates and the centrifugal fan 27 rotates, and air is sucked from the central opening of the fan guide 28. The sucked air flows in the centrifugal direction by the centrifugal fan 27 and is increased in pressure, passes through the inside of the frame 21, and the increased pressure air is discharged from the plurality of openings 21 a to the outside of the frame 21.

In the above embodiment, the cover 29 is formed in a concave shape, and the sealing material 33 is provided between the outer peripheral edge 29 a of the cover 29 and the frame 21, and the frame 21, the cover 29, and the sealing material 33 form the cover 29. Although the configuration in which the concave interior is sealed is shown, the outer peripheral edge 20a of the cover 29 is brought into full contact with the frame 21 without using the sealing material 33, and the concave interior of the cover 29 is sealed with the frame 21 and the cover 29. It may be configured.

In the above embodiment, the cover 29 is formed in a concave shape, and the brush holder 26 protruding outside the frame 21 is completely accommodated and sealed therein. However, when sealing is not necessary, As long as at least the vicinity of the outer end of the brush holder 26 is covered with the cover 29, a configuration in which the concave interior of the cover 29 is not sealed may be used. For example, the seal material 33 is not used, a step is provided on the outer peripheral edge 29a, and only a part of the outer peripheral edge 29a is in contact with the frame 21, so that the vicinity of the tip of the brush holder 26 is accommodated and covered in a concave interior and the frame 21 The nearby brush holder 26 may be opened at the step of the outer peripheral edge 29a.

Further, in the above embodiment, the cover 29 and the sealing material 33 are configured as separate parts, but the cover 29 and the sealing material 33 may be configured integrally with an elastic material.

  In the above embodiment, the cover 29 is made of a thermoplastic resin material. However, the cover 29 may be made of a thermosetting resin material or a metal material.

  According to the above configuration, the brush holder 26 is covered with the cover 29 even when the length of the carbon brush 25 is increased and greatly protrudes to the outside of the frame 21 in order to obtain a lifetime required for the hand dryer. Therefore, when the electric blower 9 assembled in a separate process from the hand drying device is transferred or when the electric blower 9 is incorporated into the hand drying device, the electric motor part (motor part) 9B is accidentally bumped somewhere. Even if this happens, the cover 29 protects the brush holder 26 so that no force is applied to the brush holder 26, so that the contact surface between the carbon brush 25 and the commutator 24 will not be displaced, and the displacement will not occur. It is possible to prevent problems such as a large amount of sparks due to abnormal contact, abnormal wear of the carbon brush 25 and unstable fluctuations in power consumption. Handling dynamic blower 9 is improved, it is possible to obtain a good hand dryer of assemblability.

  Further, since the brush holder 26 is protected by the cover 29, the structure of the hand dryer does not directly contact the brush holder 26 when the electric blower 9 of the commutator motor is incorporated into the hand dryer. The structure of the hand dryer located around the holder 26 does not need to be greatly separated from the brush holder 26, and the hand dryer can be downsized.

  Further, since the cover 29 is formed of a resin material, even if the cover 29 has a thickness of about 1.5 mm to 2.5 mm, sufficient protection strength against contact can be secured. Therefore, when the cover 29 is attached to the electric blower 9, the tip of the brush holder 26 is covered, and the protective wall can be formed with a thin wall without providing much space with the brush holder 26. Therefore, the protruding amount of the cover 29 from the electric blower 9 Therefore, even if the cover 29 is provided, an increase in the size of the hand dryer can be suppressed. In addition, since it is formed of a resin material, it can be easily formed even in a complicated shape, and a minimum volume is provided with a minimum space according to the shape of the counterpart part covered by the cover 29 such as the brush holder 26 or the frame 21. And the increase in pressure loss when the air discharged from the opening 21a flows in the vicinity of the cover 29 and the generation of noise due to turbulence can be suppressed. Further, since the cover 29 is a resin material, it is non-conductive, and the energization part inside the recess of the cover 29 and the outer surface of the cover 29 can be reliably insulated.

  The cover 29 is provided with a plurality of protruding hooks 31a, 32a provided on the frame 21 by being hooked on the edge of the opening 21a for discharging air, so that the cover 29 can be attached without using screws or the like. The cover 29 can be easily attached and the workability is good, and the cover 29 can be easily removed even when the carbon brush 25 is worn and replaced.

  Further, the cover 29 is formed in a concave shape, and all the exposed and exposed portions of the brush holder 26 outside the frame 21 are accommodated in the concave shape, and the concave interior of the cover 29 is sealed by the cover 29 and the frame 21. Therefore, the brush holder 26 which is a current-carrying part is not accidentally touched from the outside when it is operated by adjusting the electric blower 9 or the like in the process before incorporation into the hand dryer. In addition, even when the hand dryer is used without the filter 15 being mounted after cleaning the hand dryer, it is possible to prevent dust from entering the concave portion of the cover 29.

  In addition, since the sealing material 33 formed of an elastic material is provided between the frame 21 and the cover 29, the cover 29 does not rattle even if vibration occurs with the operation of the electric blower 21. In addition, it is possible to further improve the sealing condition inside the concave portion of the cover 29, and more reliably prevent dust from entering the concave portion of the cover 29.

  Moreover, since the cover 29 also covers all the energization parts provided outside the frame 21 including the power terminal part 30, it can be operated by adjusting the electric blower 9 in the process before being incorporated into the hand dryer. During operation, all the energization parts provided outside the frame 21 including the power terminal part 30 are not accidentally touched from the outside, and it is possible to prevent dust from entering the energization part.

  Further, since the sealing material 33 is provided with a through hole 33a that penetrates the lead wire 34 that supplies power to the power supply terminal portion 30 and goes out of the sealing material 33, the inside of the concave shape of the cover 29 can be easily sealed. The lead wire 34 can be pulled out of the cover 29 while being maintained.

Also, if the cover 29 and the sealing material 33 are not separate parts but are made of an elastic material, and the cover 29 and the sealing material 33 are integrally formed, the cover 29 and the sealing material 33 are made thicker than the resin 29 in order to ensure the strength of the cover 29. In addition, since it is difficult to form a complicated shape, the cover 29 becomes large and is not suitable for miniaturization of the hand dryer, but the number of parts can be reduced to improve the assemblability.

DESCRIPTION OF SYMBOLS 1 Casing 3 Hand insertion part 7 Nozzle 9 Electric blower 9a Blower part (blower part)
9b Electric motor part (motor part)
DESCRIPTION OF SYMBOLS 21 Frame 21a Opening part 22 Stator 23 Armature 24 Commutator 25 Carbon brush 26 Brush holder 29 Cover 29a Outer periphery 30 Power supply terminal part 31 Arm part 31a Hook part 32 Arm part 32a Hook part 33 Sealing material

Claims (3)

A hand insertion part having a width that allows a hand to be taken in and out, a nozzle that sends out air toward the hand insertion part, an electric blower that uses a commutator motor that sends out air from the nozzle as a drive source, and the electric blower inside A commutator motor comprising: a stator having a magnetic pole formed on an inner periphery inside a frame forming an outer shell of the commutator motor; An armature in which a winding is wound around a core of the stator and rotatably disposed on the inner peripheral side of the stator, a commutator to which the winding is connected, and a brush that contacts the commutator, A brush holder provided through the frame from the inside to the outside to hold the brush; a cover for covering the brush holder outside the frame; and a plurality of protrusion-like hooks provided on the cover Department and front And a opening for discharging a plurality provided air in the frame, a hand drying apparatus characterized by mounting the cover hook the hook portion to the opening. 2. The cover is formed in a concave shape so that a portion of the brush holder protruding outside the frame is accommodated in the cover, and the inside of the cover is sealed with the cover and the frame. The hand drying apparatus as described in. The cover is formed in a concave shape, and a portion of the brush holder that protrudes outside the frame is accommodated in the cover, and a sealing material formed of an elastic material is provided between the frame and the cover, The hand dryer according to claim 1, wherein the inside of the cover is sealed with a cover, the frame, and the sealing material.

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