JPS63133821A - Hair drier with electrification-proof function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hair dryer 7 with an electric shock prevention function that has an improved electrode configuration of an electric shock prevention circuit.

(Prior art) Conventionally, hair dryers have been used to prevent hair dryers from being accidentally dropped into the bathtub,
U.S. Pat. No. 4,464 discloses a device that prevents electric shock by cutting off the power input when water enters the interior of the device due to exposure to liquid (generally water, hereinafter explained in terms of water). 5
82@, No. 4,270゜158, Special Publication No. 1983-500
This is shown in Publication No. 585, etc. Among these, the above-mentioned U.S. Pat. No. 4,270.15
As shown in No. 8, a dryer housing is known in which electrodes made up of two wires facing each other are provided on the entire surface of the air suction port and discharge port of the dryer housing.

However, according to this known configuration, since the electrode (vi<two wires A7 net) is provided at the air inlet and outlet at right angles to the direction of air movement, this electrode becomes an obstacle and prevents the air flow. There was a problem that the original air blowing function of Hair Dry V was reduced to a low F. Furthermore, since the electrodes are provided entirely facing the air suction port and the air discharge port, there is a risk that a metal piece (conductor) such as a hairpin may come into contact with the electrodes from the outside.

(Objective of the Invention) Therefore, the present invention provides a hair dryer with electric shock prevention in which the electrodes do not obstruct airflow, there is no risk of external metal pieces such as hairpins coming into contact with the electrodes, and the responsiveness of water intrusion detection is good. It is something.

(Structure of the Invention) The present invention includes a dryer circuit having a fan motor and a heater, and an electric shock prevention circuit connected to the dryer circuit, in a housing provided with an air intake port and an air discharge port. The electric shock prevention circuit is a hair dryer with an electric shock prevention function that is equipped with an electrode and a relay means that is activated when the electrode is energized to cut off power input, in which a cylindrical inner electrode body and an outer M complement are placed between each other. The electrodes are arranged concentrically with a gap between them, and the electrodes are arranged along the housing peripheral wall at a position facing at least one of the air suction port and the air discharge port in the housing, and from the air suction port to the discharge port. It is installed parallel to the direction of air movement.

With this configuration, the electrodes do not obstruct the flow of air, and there is no risk of the electrodes coming into contact with external metal pieces.Furthermore, water intrusion can be detected immediately at the water inlet ports (air intake ports 6 and 11 outlets). be able to.

(Example) Embodiments of the present invention will be described with reference to the drawings.

Fig. 2 shows the first example in which the present invention is applied to a general hair dryer.
Embodiment FIG. 3 shows a second embodiment in which the present invention is applied to a hair dryer with a brush.

In the first embodiment shown in FIG. 2, 1 is a housing of this hair dryer, which includes a cylindrical main body 1a and
It consists of a handle part 1b installed on the lower surface side of a. The main body portion 1a is provided with an air intake port 2 on the rear surface and an air discharge port 3 on the front surface, a motor 4 at the inner rear portion, a fan 5 rotationally driven by the motor 4, and a heater 6 on the front portion. It is provided. Also,
A latching relay 7 as a relay means and a voltage dividing resistor 8 of the motor 4 are provided in the center of the main body portion 1a. On the other hand, a power switch 9 is provided on the handle portion 1b. 10 is a power cord and 11 is a plug.

Next, in the second embodiment shown in FIG. 3, the entire housing 12 is formed into a cylindrical shape, and like the housing main body portion 1a in the first embodiment, an air intake port 2 is provided on the rear surface and an air discharge port 3 is provided on the front surface. A brush 13 is attached to the front end of the housing 12, respectively. Inside the housing 12, as in the first embodiment, a motor 4 and a fan 5 are provided at the rear, a heater 6 is provided at the front, and a voltage dividing resistor 8 is provided at the center. Further, the latching relay 7 is provided within a cylindrical member 14 attached to the rear end of the housing.

In this double-stream side hair dryer, at a position facing the air suction port 2 and the discharge port 3 in the housing 1゜12,
Each is provided with an electrode 15 for detecting water intrusion. As shown in FIG. 4, this electrode 15 has a short cylindrical (ring-shaped) inner electrical body 16 made of a conductor and an outer electrode body 17 arranged concentrically with a gap 18 between them. The outer electrode body 17 is arranged along the entire circumference of the inner wall of the casing, parallel to the direction of movement of air from the air suction port 2 to the discharge port 3. Therefore, the air passes through the electrodes 15.15 in the electrode axial direction with almost no resistance, so the electrodes 15.15 do not obstruct the flow of air and the original flow of the hair 511 is carried out! A capacity of 1m (for ventilation) will be secured. In Figure 4, 18a...
. is a spacer made of an insulator provided between the electrode bodies 16 and 17 on both sides to maintain the gap 18.

A circuit configuration including this electrode 15.15 is shown in FIG.

One is a commercial power supply, 20 is an electric shock prevention circuit, and 21 is a dryer circuit (load circuit). The electric shock prevention circuit 20 includes a latching relay (hereinafter simply referred to as a relay) 7 and a rectifier 2.
2, and electrodes 1 on both sides of the air suction port 2 side and the air discharge port 3 side.
5.15. The electrodes 15.15 on both sides are connected in parallel, 14 [that is, the inner electrode bodies 16.16 and the outer electrode bodies 17.17 are connected to each other, and the connection point between the inner electrode bodies 16.16 is connected to the rectifier 22 and the latching relay. The coil 7a1 of the relay 7 is connected to one terminal of the power supply 19 via the first contact (normally open contact) 7b1, and the connection point between the outer electrode bodies 17.17 is connected to the second contact (normally open contact) of the relay 7. They are respectively connected to the other terminal of the power supply 19 via the contact point) 7b2.

Therefore, when at least 6 of the electrodes 15.15 on both sides become energized, the relay 7 is activated and both contacts 7b1.7
b2 is opened and the power input is cut off.

The dryer circuit 21 includes a rectifier 23, a motor 4, a voltage dividing resistor 8, a heater 6, and a power switch 9. This dryer circuit 21 is connected to the power supply 19 through relay contacts 7b1 and 7b2 of the electric shock prevention circuit 20, and the operation of the electric shock prevention circuit 20 (relay contacts 7t) +, 7
b2 is opened), this dry cell circuit 21 is connected to the power supply 1.
It is configured to be separated from 9.

In such a configuration, if the hair dryer A7 is accidentally dropped into the bathtub or exposed to water, the air intake port 2
Or if water enters from the outlet 3 or both,
This water enters between the electrode bodies 16.17 on one or both sides of the electrodes 15.15 on both sides and causes a short circuit between the electrode bodies 16.17 (the electrodes 15 become energized), thus preventing electric shock as described above. The circuit 20 is activated, disconnecting it and the dryer circuit 21 from the power supply 19, thereby preventing electric shock to the user and damage to the circuit.

In this case, since the electrodes 15.15 are provided facing (close to) both the air suction port 2 and the air discharge port 3 side, which are the inlet ports for water, at least 6 electrodes are provided when the water enters the air. 15 becomes conductive reliably and quickly.

In addition, there is no directionality in water intrusion detection, and detection reliability and responsiveness are excellent. Moreover, since the electrode 71115.15 is ring-shaped and is provided along the inner circumferential wall of the casing, there is no risk that the electrode 15.15 will come into contact with an external metal piece such as a hairpin.

Note that the electric shock prevention circuit 20 is connected to one power source independently of the dryer circuit 21, and therefore operates regardless of whether the power switch 9 is on or off.

Incidentally, the smaller the dimension of the gap 18 between the inner and outer electrode bodies 16 and 17, the more sensitive the electrode 15 will be in detecting water intrusion, since it will react to even more water. Furthermore, if the dimensions of the gap 18 are made small enough to allow water to act as a capillary action in the gap 18, water that enters between the electrode bodies 16 and 17 will quickly spread in the electrode circumferential direction J3 and in the axial direction due to the capillary action. Since the electrode 15 is electrically conductive over a wide area, the sensitivity of water immersion detection is further increased.

Further, as another means for increasing the detection sensitivity by utilizing the capillary action of water, it is possible to use the means shown in FIGS. 5 to 7.

In the embodiment shown in FIG. 5, a plurality of fins 24 made of an insulator are provided in a radial arrangement between the electrode bodies 16 and 17 on both sides, and the fins 24 are used to fill the gap 18 with a plurality of tunnels. It is divided into shaped voids 25.... The circumferential dimension of each of the voids 25 is formed to such a degree that the capillary action of water can act in the axial direction of the electric bridge, so that the water that enters any one or more of the voids 25 is oriented toward the electrode axis. It is made to spread in the direction. According to this embodiment, if the circumferential dimension of each cavity 25 is made small, the capillary action will work, so that the dimension of the gap 18 between the electrode bodies 16, 17 can be made relatively large. Therefore, the withstand voltage of the electrode 15 can be increased.

In the embodiment shown in FIG. 6, a ring-shaped member 26 made of a conductive material having an intermediate diameter dimension of the inner and outer electrode bodies 16 and 17 is inserted into the gap 18.
6 to form the gap 18 into two annular gaps 27 and 27.
The structure is such that the capillary action of water moves in the circumferential direction of the electrode in each of the two spaces 27 and 27. Note that spacers 28 made of an insulator are provided between the ring-shaped member 26 and the inner electrode body 16 and the outer electrode body 17 to hold both the voids 27 and 27. For this configuration,
The water that has entered both the voids 27.27 spreads in the electrode circumferential direction, and the electrode bodies 16.17 on both sides become electrically conductive via the ring-shaped member 26.

Roughly speaking, FIG. 7 shows a modification of the embodiment in FIG. 6,
A plurality of ring-shaped members 26 (three in the figure) are provided in the gap 18 portion in an internal and external manner (three or more annular voids 27 are provided).
. . . shows an example in which partitions are formed. According to this embodiment, since the dimension of the gap 18 between the electrode bodies 16 and 17 on both sides can be made larger, the withstand voltage can be made even higher.

Incidentally, in both the first and second embodiments, the electrode 15 was provided on both the air suction port side and the air discharge port side, but it may be provided on only either one.

(Effects of the Invention) As described above, according to the present invention, an electrode configured in a double cylindrical structure with cylindrical inner and outer electrode bodies is placed at a position facing at least one of the air suction port and the air discharge port in the housing of the hair dryer. In addition, since the electrodes are installed along the inner circumferential wall of the casing and parallel to the direction of air movement, the electrodes do not interfere with the air flow, ensuring the original air blowing function of a hair dryer, and eliminating the need for the conventional two-piece wire net. There is no risk of external metal pieces such as hairpins coming into contact with the electrodes, unlike when the electrodes are stretched over the air suction and discharge ports. In addition, intruding water can be quickly detected at the inlet port (air suction port and discharge port), and responsiveness of water intrusion detection is improved.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of a hair dryer V according to both the first and second embodiments of the present invention, FIG. 2 is a circuit diagram of the hair dryer according to the first embodiment, and FIG. 3 is a circuit diagram of the hair dryer according to the second embodiment. Part cutaway side view, Figure 4 is an enlarged oblique view of the 7B pole? 1 and 5 are perspective views showing another embodiment of the electrode structure,
FIG. 6 is a front view showing still another embodiment, and FIG. 7 is a front view showing still another embodiment. 1.12... Housing, 2... Air intake port, 3
...Discharge port, 4...Fan motor, 5...Fan, 6...Heater, 7...Latching relay (relay means), 15...Electric bridge, 16...Inner electrode body, 1
7...Outer III electrode body, 18...Gap between electrode bodies, 20...Electric shock prevention circuit, 21...Dryer circuit 2
1゜Patent applicant: Representative of Matsushita Electric Works Co., Ltd. Patent attorney: Etsushi Kotani
Patent Attorney Chief 1) Masayuki Patent Attorney Kawao Itaya Figure 1 Figure 2 Figure 2

Claims (1)

[Claims] 1. In a housing provided with an air intake port and an air discharge port,
a dryer circuit having a fan motor and a heater;
An electric shock prevention circuit connected to the hair dryer circuit is provided, and the electric shock prevention circuit includes an electrode and a relay means that is activated by energization of the electrode to cut off power input. The electrode is constituted by a cylindrical inner electrode body and an outer electrode body arranged concentrically with a gap between them, and the electrode faces at least one of an air intake port and an air discharge port in the housing. A hair dryer with an electric shock prevention function, characterized in that the hair dryer is provided along the peripheral wall of the housing and parallel to the direction of movement of air from the air intake port to the discharge port. 2. Equipped with an electric shock prevention function according to claim 1, characterized in that the gap between the inner and outer electrode bodies constituting the electrode is set to a size that allows the capillary action of the liquid to act in this gap portion. hair dryer. 3. The gap between the inner and outer electrode bodies constituting the electrode is circumferentially divided into a plurality of tunnel-shaped gaps, and the circumferential dimension of each tunnel-shaped gap is such that the capillary action of the liquid occurs in the axial direction of the electrode. A hair dryer with an electric shock prevention function according to claim 1, characterized in that the dimensions are set to such an extent that the hair dryer has an electric shock prevention function. 4. The gap between the inner and outer electrode bodies constituting the electrode is divided into a plurality of annular voids in the electrode radial direction, and the dimension of each annular void in the electrode radial direction is such that capillary action of the liquid moves in the electrode circumferential direction. A hair dryer with an electric shock prevention function according to claim 1, wherein the hair dryer is set to a size that allows it to work.