JPH037156A - Electrical sheltering structure for electric parts arranged in water tank - Google Patents

Abstract

PURPOSE:To prevent electricity propagation to the water in a tank by wrapping electric parts with a conductive material, and thereby allowing the current leaking at the electric parts to be fed back via the cover. CONSTITUTION:Nozzle motors M1 and a valve body position sensor 75 are wrapped with a cover 76, and conductive plating 77 is applied to the inner surface of this cover 76, and current is fed to a metal plate 78 for fitting of each nozzle motor M1. These metal plates 78 are put in electrical continuity with one another through a conductors 79. Even though water intrusion, etc., has caused continuity of the nozzle motors M1 and/or valve body position sensor 75 to the bathing hot water, the electricity is fed back via the plating 77 and metal plates 78, so that it will never propagate in the direction of the bathtub body 1. Because the metal plates 78 are put in mutual continuity to cause formation of a low-impedance circuitry between the metal plates 78, eventual continuity of any plurality of nozzle motors M1 with the bathtub lets the current flow through this circuitry, preventing from flowing inside the bathtub. Thus electric shocks are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electrical shielding structure for electrical components installed in a single water tank.

(b) Conventional technology Conventionally, water tank power is provided with electric parts that are electrically driven and/or controlled in contact with the water inside the water tank (for example, a bathtub installed in the bathtub body and outside the bathtub body). A bath water suction flow path and a bath water bullet feed flow path are interposed between the circulation pump, and the end of the bath water bullet feed flow path is opened in the bathtub body, and the bath water forced flow flow path is There is a bubble-generating bathtub which is constructed so as to spray a bath mixed with air bubbles into the bathtub body by connecting the air intake part in a continuous manner. By electrically controlling the degree of
There is one that allows the discharge pressure and discharge m of the bath to be controlled.

A control device equipped with drive circuits and sensors for these electrical components is also provided.

(C) Problems to be Solved by the Invention However, if current leaks from these electrical components, it may interfere with sensors and cause erroneous detection or malfunction.

In particular, in the above-mentioned bubble-generating bathtub, multiple electrical parts such as the circulation pump, jet nozzle, and sensor are in contact with the bathtub, and water intrusion may cause the insulation of the current-carrying parts of these electrical parts to break, causing the bathwater to leak. When electrical conduction occurs, a leakage current path is formed between the control device and/or the drive circuit and the ground.
This leakage current flows into the bathtub of the bathtub body, and there is a risk that a bather will receive an electric shock if he or she comes into contact with a grounded item.

There is a risk of electric shock when bathers come into contact with grounded items.

In other words, in a commercial power supply, one electrode is always grounded to the ground, and when electrical components are connected to the bath, the drive circuit and/or control device → electrical components - bath - human body - grounded items - earth - commercial power A leakage current path called earth is formed, and current flows through the human body.

Additionally, if two or more electrical components conduct to the bathtub at the same time, current will flow over a wide area within the bathtub body, and if a bather intervenes within the same area, he or she may receive an electric shock even if he or she does not come into contact with any grounded items. become.

(d) Means for Solving the Problems In the present invention, electrically driven and/or
Alternatively, in water Iθ in which electrical components to be controlled are arranged, the outer periphery of the electrical components is covered with a cover made of a conductive material. This is what we intend to provide.

(E) Functions and Effects According to the present invention, since the outer periphery of the electrical component is covered with a conductive material, the current leaking from the electrical component returns through the cover, so that it does not reach the water in the aquarium. It is possible to prevent the propagation of the leakage current, and prevent various harmful effects caused by the above-mentioned leakage current, such as electric shock when a person comes into contact with the water in the aquarium, and interference with electrical components such as sensors installed in the aquarium. be able to.

In particular, when the present invention is applied to the above-mentioned bubble-generating bathtub, even if the insulation is broken due to water intrusion and electrical components are electrically connected to the bathtub, they will return through the cover as described above. Since leakage current does not propagate inside the bathtub body, electric shock can be prevented and safety can be greatly improved.

(F) Example An example of the present invention will be explained based on the drawings using a bubble-generating bathtub as an example. In FIGS. 1 and 2, (A) shows the bubble-generating bathtub according to the present invention, and Generation bath I
! (^) is between the bathtub body (1) and the bath circulation pump (2) installed outside the bathtub body ([). ), and the terminal end of the bath water bullet feeding channel (4) is branched into six, and the foot side, dorsal side, and ventral side are provided at each end of the branched bath water bullet feeding channel (4). The side jet nozzles (5) (5) (6) (8) (7) (7) are connected and connected, and the foot side, dorsal side, and ventral side jet nozzles (5) (5)
(6)(8)(7)
) is opened into the bathtub body (1), and an air intake part (8) is connected to the bathwater forced flow path (4) to blow out the bath mixed with air bubbles into the bathtub body (1). It is configured as much as possible.

Further, a rim (9) of a predetermined width is formed on the periphery of the bathtub body (1), and an air intake portion (8) is provided in the rim (9).

In addition, a pump protective case (10) is attached to the outside of the bathtub body (1).
), and the above-mentioned circulation pump (2) and filter (
11), a control device (C), an inverter (13),
It houses these accessory devices.

As shown in Fig. 3, the circulation pump (2) has a motor section (
21) and a pump section (22), and the motor section (2I) is a three-induction induction motor, with a field (24) disposed in the motor casing (23) and a pump section (22). Magnetic (2
4) is wound with a winding (25), and an alternating current voltage is applied to the winding (25) to generate a rotating magnetic field, and a box-shaped rotor (26) is output in the motor casing (23). shaft(
The inverter (13), which will be described later, is
By changing the rotation speed of the rotating magnetic field by
The rotation speed of the output shaft (27) can be adjusted.

The pump part (22) has inside the pump casing (28),
An upper impeller chamber (29) that communicates with the bath suction flow path (3) and the a-filter (11), and a lower impeller that communicates with the bath water suction flow path (3) and the bath water bullet feed flow path (4). The upper and lower impellers (31 and 32) are rotatably arranged in the upper and lower impeller chambers (29 and 30), respectively, and are interlocked and connected to the output shaft (27). are doing.

Further, as shown in the figure, a synthetic resin insulation I is provided between the motor casing (23) and the pump casing (28).
M (33) is installed to prevent the high frequency current leaked to the motor casing (23) via the field (24) from leaking into the bath water via the pump casing (28), and to prevent the high frequency current leaking into the bath water via the pump casing (28). , the lower impellers (31) and (32) are integrally constructed from a synthetic resin material having electrical insulation properties, and the central axes (34) of the impellers (31 and 32) are extended upward to form a coaxial (34) An output shaft insertion hole (35) is bored in the upper end of the motor part (21), and the output shaft (27) of the motor part (21) is inserted into the circumference (35).
) is inserted and fixed, and the upper part of the casing (28) and the center shaft (
A mechanical seal (36) is interposed between the pump part (22) and the motor part (2) to prevent water leakage, and a central shaft (34) made of electrically insulating synthetic resin connects the pump part (22) and the motor part (2).
1) are electrically insulated.

The inverter (!3) is as shown in Figures 4 and 5.
Convert single-phase AC 100V from the commercial power supply (37) to DC 200V with the rectifier circuit (38) and smoothing circuit (P),
The output frequency of the inverter (13) can be arbitrarily changed by supplying the switching circuit (39) and controlling the switch notching circuit (39) by the control device (C) via the inverter control circuit (12). I can do it.

Therefore, under control from the control device (C), the rotation speed of the circulation pump (2) can be changed to change the discharge pressure and discharge amount of the circulation pump (2).

In addition, by PWM controlling the output waveform of the inverter, the average value of the output waveform is approximated to a sine waveform,
The motor section (21) rotates smoothly.

In addition, in this embodiment, each jet nozzle (5) (6) (
7) has the same configuration, and will be explained with reference to FIG. 6, taking the foot side jet nozzle (5) as an example.

The foot side jet nozzle (5) includes a cylindrical nozzle body (70) fitted into the side wall of the bathtub body ([), and a nozzle body (70) fitted into the side wall of the bathtub body ([)].
0), a valve body (72) provided behind the valve seat (71), a nozzle motor (old) that moves the valve body (72) forward and backward; It consists of a swingable throat (73) provided in front of the valve seat (71).

The nozzle body (70) has a bath water forced flow path (4) at its rear.
), and the valve body (72) is brought into contact with and separated from the valve seat (71) to adjust the amount and jet pressure of the bath from the nozzle (5), and an air intake part is provided on the central peripheral wall. Open the air intake port (74) that communicates with (8), and then open the valve seat (7I).
Due to the ejector effect of the bathtub passing through the bathtub body (1
) is configured so that air is mixed into the bath water that spouts out.

The nozzle motor (old) consists of a stabbing motor attached to the rear wall of the nozzle body (70) and a ball screw that converts the rotational motion of the motor into linear motion and transmits it to the valve body (72). A valve body position sensor (75) for detecting the position of the valve body (72) is disposed at the rear end.

However, if the insulation of one of the electrical components such as the nozzle motor (Ml) and the valve body position sensor (75) is impaired and the electrical continuity occurs with the bath, the current will flow through the path of the leakage current, If a bather comes into contact with a grounded item, there is a risk of electric shock.Furthermore, if multiple electrical components are connected to the bath water at the same time, current will flow between these electrical components, and the bather may receive an electric shock. If this happens, the degree of electric shock is severe and is extremely dangerous.

Therefore, in this embodiment, the outer periphery of each nozzle motor (old) and valve body position sensor (75) is covered with a conductor to prevent the above-mentioned current from leaking into the bath in the bathtub body (1). to prevent electric shock.

That is, as shown in FIG. 6, each nozzle motor (old) and the valve body position sensor (75) are covered with a cover (76), and the inner surface of the cover (7B) is coated with conductive plating (77). ) to provide electrical continuity to the metal plate (78) for mounting the nozzle motor (old).

Furthermore, the metal plates (78) are electrically connected to each other via conductive wires (79).

By doing this, even if the nozzle motor (old) and/or valve body position sensor (75) are electrically connected to the bath water due to flooding etc., the current will flow through the metal plate (77) and the metal plate (78). Therefore, it does not propagate toward the main body (1) of the bath 10.

In addition, by making each metal plate (78) conductive to each other, a low impedance circuit is formed between each metal plate (78), so multiple nozzle motors (old) etc. can be connected to the bath water. Even if conduction occurs, current will flow through the circuit, preventing current from flowing through the bathtub, thereby preventing electric shock.

As shown in FIG. 7, the control device (C) includes a microprocessor (MPU) and a human output interface (+>(
0) and a memory (M) that stores a control program, and the input interface (1) includes a temperature sensor (1) and a pressure sensor ( p>, as shown in Fig. 1, the operation panel (I4) provided on the air intake part (8) can be used to turn on and off the operation of the bubble generating bathtub (^), and to turn on and off the operation of each jet nozzle. Various switches (50) (50) are used to adjust the intensity of the hot water jet from the bathtub, specify the jetting form of the hot water, and the nozzle for spouting the bath water.
0)..., and these sensors (t)(p
) and switch group, each jet nozzle (5
) (5) ([1) (6) (7) By controlling the opening/closing degree of (7) and the rotation speed of the circulation pump (2), various types of bath jets can be created. .

Further, the operation panel section (14) is provided with an infrared receiving section (17) at the negative end thereof to receive a control signal from the remote controller (16).

The remote controller (IB) has an operation panel section (I
A group of switches corresponding to the various switches (50) (50)... arranged in ), the infrared signal is received by the infrared receiving section (17) of the operation panel section (14), and is input manually to the input interface (1) of the control device (C), thereby allowing the bather to perform control operations. It is configured to accept the above-mentioned switches and take the form of the bath water ejection corresponding to each of the above-mentioned switches.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a bubble-generating bathtub having an electric shielding IM structure for electric parts according to the present invention, FIG. 2 is an explanatory diagram showing the structure of the same bathtub, FIG. FIG. 5 is a block diagram showing the configuration of an inverter, FIG. 5 is a switching circuit diagram, FIG. 6 is a sectional view of a bath nozzle, and FIG. 7 is a block diagram showing the configuration of a control device. (^): Bubble generating bathtub (1): Bathtub body (2): Circulation pump (3) Dual bath water suction flow path (4): Bath water bullet feed flow path (8); Air intake section (13): Inverter (21): Motor section (37): Power supply

Claims (1)

[Claims] 1) An aquarium equipped with electrical parts that are electrically driven and/or controlled in contact with the water inside the tank, characterized in that the outer periphery of the electrical parts is covered with a cover made of a conductive material. Electrical shielding structure for electrical components installed in