JP2876640B2 - Automatic earth connection device for electrical equipment with hot water circulation device - Google Patents

Description

The present invention relates to an automatic earth connection device for electric equipment.

(B) Conventional technology Conventionally, one of the wires of a commercial power supply is grounded to the ground, and the ground side of a frame or the like of an electric device to be supplied with power from the commercial power supply is connected to the wire grounded to the ground. By doing so, the electric potential of the ground of the electric device is made equal to the ground.

Then, an electric detection driver or the like is used to detect the grounded wiring of the commercial power supply, and the electric detection driver encloses a neon tube having one end connected to a bit and the other end connected to a grip. When a person grips the driver's grip and brings the bit into contact with the wiring of the commercial power supply, the neon light turns on when the light turns on, and when the light does not turn on, the wire is grounded. ,
It detects the grounded wire.

(C) Problems to be Solved by the Invention However, when the electric equipment is provided with a bath water circulation device having an inverter, a pump, and the like, if the ground for the motor for driving the pump is incomplete, the high-frequency current is reduced. The bath water in the bathtub body leaks through the water contact part of the pump, and there is a danger that the bather may receive an electric shock, which is very dangerous. If you touch it, you may get an electric shock, and the sensitivity of the neon tube is low, so if there is not enough floating capacitance between the human body and the ground, touch the bit to the ungrounded wiring with the electric detection driver. Even if it is made to light, even if it does not light up, there is a risk that this wire may be mistakenly recognized as being grounded and the danger may be increased.

In addition, even if the ground wiring of the commercial power supply is detected, the work of connecting the ground of the electric equipment to the ground wiring is required, and these works have the disadvantage that knowledge of electricity is required. If uncertain grounding work is performed, there is a danger of electric shock, and furthermore, in an apartment house or the like, a large number of electric devices must be individually grounded, and the work is complicated.

(D) Means for Solving the Problems According to the present invention, there is provided an electric apparatus including a bath circulating device for circulating bath water in a bath tub body by receiving power supply from a commercial power source grounded to the ground via a wiring. Connecting the input terminals of amplifiers having high input impedance to the wiring of the commercial power supply between the commercial power supply and the electrical equipment, connecting the circuit opening and closing means to the output terminals of each amplifier, respectively, On the other hand, the present invention relates to an automatic earth connection device for an electric device having a bath water circulation device, wherein the ground of the electric device is connected to a grounded wiring of a commercial power supply.

Also, the present invention provides one of the above-described circuit opening / closing means,
It is also characterized in that the ground of the electric device and / or the ground of the case containing the electric device is connected to the grounded wiring of the commercial power supply.

(E) Function / Effect According to the present invention, among the wirings of the commercial power supply, the potential of the wiring grounded to the ground is equal to the ground, but the potential of the other wirings is not equal to the potential of the ground. If the wiring of the commercial power supply connected to the input terminal is grounded, there is no output from the element, and if not, there is output from the element.

Therefore, whether or not the wiring of the commercial power supply connected to the input terminal of the element is grounded to the ground can be determined based on the presence or absence of the output of the amplifier.

In addition, since there is a storage capacitance between the electric device and the ground, any amplifier having a high impedance input terminal can detect the potential difference between the wiring of the commercial power supply and the ground.

Then, the relay is operated by the output of each of the amplifiers, and the ground of the electric device can be connected to the wiring grounded to the ground.

Therefore, simply by connecting the electric device to the commercial power source, the ground of the electric device and / or the ground of the case incorporating the electric device can be automatically connected to the grounded earth of the commercial power source, It can be made equal to the electric potential of the ground of the electric equipment and / or the ground side of the case in which the electric equipment is incorporated, and in particular, in the case of the electric equipment having the bath water circulation device, it is ensured that the bather gets an electric shock. In addition to this, it is possible to prevent an electric shock accident during ground detection as described above.

(F) Example An example of the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration of an automatic earth connection device (K) for electric equipment according to the present invention, wherein (S) is a single-phase commercial power supply, and of two wires (Lc) and (Lh). One wire (Lc) is grounded, and the other wire (Lh) is not grounded.

(D) is an electric device connected to a commercial power supply (S) via a plug (P) and housed in a case (d).

The commercial power supply (S) and the electric device (D) are connected via an insulating transformer (T).
And the electrical equipment (D) are insulated in terms of direct current.

(A1) and (A2) are amplifiers having a high input impedance, each of which has a DC power via a power terminal (Vcc) connected to the electric device (D) and a ground terminal (g) connected to the case (d). Is supplied, and the input terminals (i1) and (i2) are connected to the respective lines (Lc) of the commercial power supply (S).
(Lh) to amplify the voltage between each ground terminal (g) and input terminals (i1) (i2), and to amplify each output terminal (01) (0
From 2), the signals are output to the relays (R1) and (R2) as circuit switching means via the inverting elements (11) and (12), respectively.

In addition, the ground (G) of the electric device (D) and the wiring (Lc) (Lh) of the commercial power supply are connected to the contacts of the relays (R1) and (R2), respectively.

(Cs) indicates the storage capacitance existing between the case (d) and the ground.

The embodiment of the present invention is configured as described above, and a plug (P) is inserted into a commercial power supply (S) to
Is connected, the input terminal (i1) of each amplifier (A1) (A2)
(I2), each wiring (Lc) (Lh) of the commercial power supply (S) is connected.

The input terminals (i1) (i) of each amplifier (A1) (A2)
2) Each line (Lc) (Lh) of the commercial power supply (S) connected to
Among them, there is an output from the amplifier connected to the wiring (Lh) not grounded to the ground, and no output from the amplifier connected to the wiring (Lc) grounded to the ground.

Each of the above outputs is an inversion element (I1) (I
The output is inverted by 2) and output to relays (R1) and (R2).

Therefore, the relay connected to the grounded wire (Lc) operates to close the contact, and connects the ground (G) and the case (d) of the electric device (D) to the grounded wire (Lc). Connect to

On the other hand, since the relay connected to the wire (Lh) that is not grounded to the ground does not operate, the contact remains open.

Thus, by simply connecting the plug (P) of the electric device (D) to the commercial power supply (S), the wiring (Lc) grounded to the ground is detected, and the electric device (D) is connected to the wiring (Lc). Is connected to the case (d), the potential of the ground (G) of the electric device (D) can be automatically set to the same potential as the ground.

Note that the connection between the output terminals (01) and (02) of the amplifiers (A1) and (A2) and the relays (R1) and (R2) is alternated so that the inverting element (I
1) It is possible to perform equivalent conversion on the circuit configuration, such as omitting (I2) or replacing the amplifiers (A1) and (A2) with inverting amplifiers and omitting the inverting elements (I1) and (I2). it can.

Next, an application example in which the present invention is applied to a power supply input portion of a bubble generating bath (A) configured to drive a bath water circulation pump by an inverter to prevent an electric shock due to a high frequency generated in the inverter. explain.

 First, the bubble generation bath (A) will be described.

2 and 3 show the structure of the bubble generating bathtub (A). The bubble generating bathtub (A) is a bathtub body (1) and a bath water circulation device installed outside the bathtub body (1). A hot-water bath suction channel (3) and a hot-water bath channel (4) are interposed between (2) and the end portion of the hot-water bath channel (4). , At each end of the branched hot water flow path (4),
Dorsal and ventral ejection nozzles (5) (5) (6) (6) (7)
(7) is communicated and connected, and the hot water bath (4) through the same foot side, back side, and ventral side jet nozzles (5) (5) (6) (6) (7) (7) Into the bathtub body (1),
An air intake section (8) is provided in communication with the strong bath flow path (4) so as to blow out the bubble-containing bath water into the bathtub body (1).

A rim (9) having a predetermined width is formed around the periphery of the bathtub body (1), an air intake section (8) is provided on the rim (9), and an operation panel (14) is provided above the rim.

A function case (10) is provided outside the bathtub body (1), and the bath water circulation device (2), the filter (11), the control device (C), and the inverter (13) are provided inside. And other electrical devices (D ') are collectively stored.

As shown in FIG. 4, the bath water circulation device (2) includes a motor (21) and a pump (22).
1) is a three-phase induction motor, and a motor casing (2
3) Arrange the field (24) inside, and wind (2)
5), and applying an AC voltage to the winding (25) to generate a rotating magnetic field, and a basket-shaped rotor (26) in the motor casing (23) via the output shaft (27). The rotating magnetic field rotates the rotor (26) and the output shaft (27).

The pump (22) has an upper impeller chamber (29) and a lower impeller chamber (30) formed in a pump casing (28). The strong feed channel (4) is connected and connected, and the upper impeller chamber (29) is connected and connected with a filter (11). And
The upper and lower impellers (31) and (32) are rotatably arranged in the upper and lower impeller chambers (29) and (30), respectively.
It is linked to the output shaft (27) of 1).

Further, in the present embodiment, between the motor casing (23) and the pump casing (28), a material having a low dielectric constant such as polypropylene, polyethylene, polytetrafluoroethylene, and methylpentene resin is used. By providing the insulating plate (33) having a thickness of about 10 mm, high-frequency current is prevented from leaking into the bath water via the pump casing (28).

The upper and lower impellers (31) and (32) and the central shaft (34) extending above them are integrally formed of the same material as the insulating plate (38), and the upper end of the central shaft (34) is formed. The output shaft insertion hole (35) is drilled in the hole, the output shaft (27) of the motor (21) is inserted and fixed in the hole (35), and the pump casing (28)
Mechanical seal (36) between the upper part of the shaft and the central axis (34)
In addition to sealing, the high frequency leaked to the output shaft (27) via the rotor (26) and the insulation of the winding (25) of the motor (21) deteriorated, Prevents the current when a short circuit occurs from leaking into the bath.

The inverter (13) is, as shown in FIGS. 5 and 6,
Rectifier circuit (38) using single-phase 100V AC from commercial power supply (S)
And a smoothing circuit (F) to convert the voltage to 200 V DC and supply it to a switching circuit (39). The switching circuit (39) is controlled by a control device (C) via an inverter control circuit (12), and the inverter ( 13) The output frequency can be changed arbitrarily.

Therefore, the rotation speed of the motor (21) of the bath water circulation device (2) is changed by control from the control device (C),
The discharge pressure and discharge amount of the bath circulating device (2) can be changed.

Also, by performing PWM control on the output waveform of the inverter, the average value of the output waveform is approximated to a sine waveform,
The rotation of the motor (21) is smooth.

However, the AC output of the inverter (13) contains many high-frequency components, and this high-frequency component is generated by the stray capacitance between the field (24) and the winding (25) of the motor (21). If transmitted to the 24) side and the grounding of the motor (21) and the like is incomplete, high-frequency current leaks into the bath water in the bathtub body (1) through the wetted portion of the pump (22), and the bather There was a risk of electric shock.

One pole of the commercial power supply is always grounded to earth, and when a bather comes into contact with a grounded article, the high-frequency current generated by the inverter (13) is
3) → Motor (21) winding (25) → (stray capacity) → Motor (21) field (24) → pump (22) → bath water → human body → earthed goods → earth → commercial power Leakage occurs through a route from ground → commercial power supply to the inverter (13) → inverter (13), and the bather intervening in the above route is electrically shocked.

The danger of the electric shock is caused by the electric equipment (D ′) such as the inverter (13), the motor (21), and the control device (C) described later.
This is because the grounding of the ground is incomplete, and if a reliable grounding is performed, such a danger can be prevented.

Therefore, as shown in FIG. 7, an automatic ground connection device (K) for the electric equipment of the present invention is provided at the power input portion of the bubble generation bath (A), and the electric equipment such as the inverter (13) is automatically connected. By connecting the ground of D ′) to the ground via the ground wiring (Lc), the electrical equipment (D ′)
Therefore, the electric device (D ') can be set to the same potential as the ground without separately grounding the ground, and it is possible to prevent an electric shock when a bather comes into contact with the grounded article.

Next, another part of the bubble generating bath (A) will be described.

Each ejection nozzle (5) (6) (7) has the same configuration,
The foot-side ejection nozzle (5) will be described as an example with reference to FIG.

The foot-side jet nozzle (5) has a cylindrical nozzle body (70) fitted into the side wall of the bathtub body (1) and the nozzle body (7).
0), a valve body (72) provided behind the valve seat (71), a nozzle motor (M1) for moving the valve body (72) forward and backward, and the valve The throat (73) is provided in front of the seat (71) and can swing freely.

The nozzle body (70) is connected to the bath hot water supply passage (4) at the rear thereof, and the valve body (72) is brought into contact with and separated from the valve seat (71). The ejector effect of the bath water passed through the valve seat (71) by adjusting the amount and pressure of the hot water and opening the air inlet (74) communicating with the air intake (8) at the central peripheral wall. Thus, air is mixed into the bath water spouting into the bathtub body (1).

The nozzle motor (M1) is composed of a stepping motor mounted on the rear wall of the nozzle body (70), and a ball screw that converts the rotational motion of the motor into a linear motion and transmits the linear motion to the valve body (72). A valve body position sensor (75) for detecting the position of the valve body (72) is provided at the rear end.

As shown in FIG. 9, the control device (C) includes a microprocessor (MPU) and an input / output interface (I).
(0) and a memory (M) storing a control program. The input interface (I) includes a temperature sensor (t) and a pressure sensor disposed in the bath hot water flow path (4). (P) Turn ON / OFF the operation of the bubble generation bathtub (A) arranged on the operation panel section (14), adjust the strength of the hot water jet from each jet nozzle, and change the mode of the hot water jet. Are connected to various switches (50), (50),... For specifying the nozzles for spouting bath water, and inputting from these sensors (t) and (p) and a switch group. 5) The degree of opening and closing of (5), (6), (6), (7), and (7), the number of rotations of the bath water circulation device (2), and the like can be controlled to take various bath water jetting modes. I have to.

The operation panel section (14) is provided with an infrared ray receiving section (17) at one end to receive a control signal from the remote controller (16).

The remote control (16) has an operation panel (1
The switch group corresponding to the various switches (50) (50) ... arranged in 4) is arranged, and the infrared signal set for each switch is transmitted from the infrared irradiation unit (15) by operating the switch group. Transmit and send the infrared signal to the operation panel (1
4) Received by the infrared receiver (17), and received by the controller (C)
Input to the input interface (I) of
In response to a control operation from a bather, a configuration is adopted in which a bath is ejected corresponding to each of the above switches.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing the configuration of an automatic earth connection device for electric equipment according to the present invention, FIG. 2 is a perspective view of a bubble generating bath, FIG. 3 is a block diagram showing the configuration of the bath, and FIG. FIG. 5 and FIG. 6 are block diagrams showing the configuration of an inverter, FIG. 7 is a block diagram showing the configuration of an application example of the present invention, and FIG. 8 is a vertical cross-sectional view of a jet nozzle. FIG. 9 is a block diagram showing the configuration of the control device. (A1) (A2): Amplifier (D): Electrical equipment (Lc) (Lh): Wiring (R1) (R2): Relay (S): Commercial power supply (T): Isolation transformer (G): Ground terminal (i1 ) (I2): Input terminal (01) (02): Output terminal

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuaki Hashida 2-81-1, Honmura, Chigasaki-shi, Kanagawa Prefecture Tochiki Kikai Co., Ltd. Chigasaki Plant (72) Inventor Koichi Uchiyama 2-81-1, Honmura, Chigasaki-shi, Kanagawa Prefecture No .: 72 in Tochiki Co., Ltd. Chigasaki Factory (72) Inventor: Kenji Moriyama 2-8-1, Honmura, Chigasaki-shi, Kanagawa Prefecture In Tochiki Co., Ltd. Chigasaki Factory (56) References JP-A-3-4864 (JP, A JP-A-3-86160 (JP, A) JP-A-3-21246 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61H 23/00 520

Claims (3)

(57) [Claims] 1. A bath water circulation device (2) for circulating bath water in a bathtub body (1) by receiving power from a commercial power supply (S) grounded to the ground via a wiring (Lc). In the electric equipment (D), between the commercial power supply (S) and the electric equipment (D), the amplifiers (A1) (A2) having high input impedance in the wiring (Lc) (Lh) of the commercial power supply (S) Connect the input terminals (i1) and (i2) to the output terminals (01) and (02) of each amplifier (A1) and (A2).
Circuit switching means are connected to each other, and one of the circuit switching means connects the ground (G) of the electric device (D) to the grounded wiring (Lc) of the commercial power supply (S). Automatic earth connection device for electrical equipment equipped with bath water circulation device. 2. A bath water circulation device (2) for circulating bath water in a bathtub body (1) by receiving power supply from a commercial power supply (S) grounded to the earth via a wiring (Lc). In the electric equipment (D), between the commercial power supply (S) and the electric equipment (D), the amplifiers (A1) (A2) having high input impedance in the wiring (Lc) (Lh) of the commercial power supply (S) Connect the input terminals (i1) and (i2) to the output terminals (01) and (02) of each amplifier (A1) and (A2).
Each of the circuit switching means is connected, and one of the circuit switching means connects the ground (g) of the case (d) containing the electric device (D) to the grounded wiring (Lc) of the commercial power supply (S). An automatic earth connection device for electrical equipment having a bath water circulation device for connection. 3. A bath water circulation device (2) for circulating bath water in a bathtub body (1) by receiving power supply from a commercial power supply (S) grounded to the earth via a wiring (Lc). In the electric equipment (D), between the commercial power supply (S) and the electric equipment (D), the amplifiers (A1) (A2) having high input impedance in the wiring (Lc) (Lh) of the commercial power supply (S) Connect the input terminals (i1) and (i2) to the output terminals (01) and (02) of each amplifier (A1) and (A2).
Each of the circuit switching means is connected, and one of the circuit switching means is used to connect the electric equipment (D) ground (G) and the ground (g) of the case (d) containing the electric equipment (D).
To a grounded wiring (Lc) of a commercial power supply (S).