JP2516120B2 - Bath water heater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath device, and more particularly to an electric heating device of a cleaning device arranged in a circulation path for forcibly circulating bath water by a circulation pump.

[0002]

2. Description of the Related Art In recent years, a bathtub device has been developed which is equipped with a cleaning device for cleaning by filtering, sterilizing or the like in a circulation path for forcibly circulating bathtub water by a circulation pump as shown in FIG. Has also installed a heating device in the cleaning device to keep the bath water at an appropriate temperature continuously and to be able to bathe comfortably at any time for 24 hours.

The bath water purifying apparatus shown in FIG. 8 will be described. 1 is a bathtub containing bath water 2, 3 is a purifying apparatus, and the purifying apparatus 3 is a filter 5, activated stones 6, and activated carbon 7. The cleaning tank 4 is filled with a cleaning treatment material such as the above, a circulation pump 8, a heating device 9, an ozone generator 10, and the like, and 11 is a hot water temperature sensor for controlling the temperature of bath water.

The bath water 2 in the bath 1 is sucked up by the water suction pipe 12 by the operation of the circulation pump 8 to be cleaned by the cleaning tank 4.
Then, the dirt is filtered by the filter 5, and a cleaning process such as activation by the activated stone 6 and adsorption by the activated carbon 7 is first performed.

After that, the bath water is heated to a predetermined temperature by the heating device 9 based on the temperature detected by the hot water temperature sensor 11, and then the ozone generator 10 is introduced into the bath 1 from the jet nozzle 14 at the tip of the fountain pipe 13. It is jetted as a jet flow together with the generated air containing ozone.

As a result of the above cleaning treatment, the bath water 2
Is clean and constantly sterilized by ozone sterilization and kept at a suitable temperature, so you can enjoy a comfortable bath 24 hours a day.

In the cleaning device 3 as described above, as a heating device 9 for heating the bath water so as to keep it at an appropriate temperature, a sheathed heater or a ceramic heater in which a heating wire is covered with a metal pipe filled with an electrically insulating ceramic powder is used. Electric heaters such as ceramic heaters embedded in the are widely used because the device is compact and inexpensive, and the control is easy.

[0008]

However, when the bath water is directly heated by an electric heater having such a single insulation, the metal pipe covering the heating wire may be corroded with holes or the ceramic may crack, resulting in insulation. It is very dangerous for bathers because there is a risk that it will be defective and electric leakage will occur in the bath water.

Therefore, it is conceivable to use a double sheathed heater with double insulation, but even in this case, if a hole is made in the outer metal pipe and the outer insulation is broken, then a single insulation is used. Since it is the same, even if double insulation is used, there is no change in that there is a risk of leakage due to a slight increase in the time at which the insulation breaks, and this is the same even if the number of insulating layers is increased.

In order to prevent such a risk of electric leakage, an indirect heating system in which a heating medium such as insulating oil is heated by an electric heater to exchange heat with bath water may be adopted, but in this case,
As the heating device becomes larger, the cost becomes higher.

Further, as a measure to prevent the risk of electric leakage due to direct heating using an electric heater, an insulating transformer is provided in a circuit for supplying power to the electric heater to lower the voltage from a commercial power supply of 100V to about 24V. , Power supply 1
In some cases, the secondary circuit of the heater is insulated from the secondary circuit of the heater so that the leaked current does not flow into the bathtub.

However, the safety of the insulating transformer can be maintained only when the heater has a small capacity.

This is because even if the heater has a capacity of about 500 W, the capacity is large, so that the insulating transformer is considerably large and expensive, and the amount of current flowing is as large as about 21 A. Therefore, a considerably thick electric wire is required for wiring. This is because it cannot be applied to a bathtub device when it is necessary to dispose a heater having a larger capacity than this.

The present invention solves the above-mentioned drawbacks of the prior art, and even if a large-capacity electric heater of about 1 KW is directly connected to a commercial power source, it is safe because it prevents the risk of leakage and is compact and cost-effective. Aim to provide a cheaper bath water heating device.

[0015]

That is, the present invention provides a multiple sheath type electric heater in which a heating wire is multiply covered with a metal pipe and an electric insulating material is filled in a void portion in the metal pipe to be insulated with a plurality of electric insulating layers. In a bath water heating device arranged in a circulation path of bath water, a metal pipe sandwiching the electric insulation layer with respect to the outermost electric insulation layer of the multiple electric insulation layers or a conductive member adhered to the metal pipe. A heating device for bath water, characterized in that an insulation deterioration degree detecting device is provided via an attached insulation deterioration degree measuring terminal, and the insulation deterioration degree detecting device is based on a leakage of the insulation deterioration degree detecting device itself. In order to prevent electric shock, the power supply unit insulated from the commercial power supply is connected,
A heating device for bath water as described above, characterized in that it is connected to an insulation deterioration degree measuring terminal for an outermost electric insulating layer of an electric heater through a detection device circuit disconnecting device whose energization is controlled by a control device. In the electric heater, when the insulation deterioration degree detecting device detects that the insulation layer has deteriorated in insulation, the hot and ground sides of the power supply line to the heater are simultaneously turned off to completely cut off the power supply. The bath water heating device is characterized in that the bath water is connected to a commercial power source through a cutting device with a heater that can be opened and closed freely under the control of a control device based on an insulation deterioration detection signal from the detection device.

[0016]

The present invention is configured as described above, and since the heater is of the multiple sheath type in which the heating wire is insulated by the multiple electrical insulating layers through the multiple metal pipes, the heater is constantly in contact with the bath water. Even if there is a hole in the outermost metal pipe that is prone to corrosion and bath water penetrates into the electrical insulation layer inside it, and the insulation deteriorates, the heating wire to which the commercial power source connects will still be inside the degraded electrical insulation layer. It is very safe because it is still well insulated by the electric insulation layer existing through the metal pipe and does not leak electricity immediately.

Further, as described above, the control device is provided with the insulation deterioration degree detecting device for measuring the insulation deterioration degree with respect to the electric insulation layer which is apt to be deteriorated due to invasion of bath water as described above. The insulation degradation degree is detected by determining the measurement time point at a predetermined interval based on the control of 1., and if an abnormality is found in the detection result, the electric heater is immediately disconnected and the display is controlled. It is very safe because it can be detected quickly and appropriate action can be taken quickly.

The insulation deterioration degree detecting device is connected to a power supply device insulated from a commercial power source, and the insulation deterioration degree with respect to the outermost electric insulation layer of the electric heater is connected through a detection device circuit disconnecting device whose energization is controlled by the control device. Since it is connected to the measurement terminal, the insulation deterioration detection device is not energized from the commercial power supply at all, and is also energized intermittently from the low voltage power supply for measurement when measuring the insulation deterioration degree at predetermined intervals. There is no risk of electric shock due to leakage from the insulation deterioration degree detection device itself.

Further, the insulation deterioration degree detecting device is connected to an insulation deterioration degree measuring terminal mounted on a metal pipe sandwiching the outermost electric insulating layer or a conductive member in close contact with the metal pipe, and is electrically connected to the metal pipe. Since the insulation deterioration detection device only carries out current when detecting the insulation deterioration due to the action of the detection device circuit disconnection device, the outermost metal pipe is galvanically corroded and a hole is formed inside the insulation layer. However, there is no need to worry that the bath water will enter and deteriorate.

In addition to this, since the heater is connected to the commercial power source through the double-sided heater enclosing device, when the insulation deterioration degree detecting device detects the deterioration of the outermost electric insulating layer, the power supply to the heater is supplied. Turn off the hot and earth sides of the supply line at the same time to completely cut off the energization to the heater.Even if the earth side is cut by the way of inserting the power plug into the outlet like in the case of single cut, the hot side cannot be cut off, so the heater is energized. There is no danger of getting an electric shock without turning off.

As described above, in addition to improving the safety of the electric heater itself, a device for checking the safety of the electric heater is also provided, and the safety of the safety check device itself is also increased. The safety of the device is very high, and there is no danger in connecting a large capacity electric heater directly to the commercial power supply.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a basic block diagram of the first embodiment of the present invention. As an electric heater, the details of its structure are shown in FIGS. The sheathed heater 24 is used, and this double sheathed heater 24 is used.
Is directly connected to the commercial power supply 15 through a double-cut heater-equipped cutting device 25 that can completely cut off the power supply.

Further, the double sheath heater 24 is connected to an insulation deterioration degree detecting device 22 for detecting the insulation degree of the outer electric insulating layer by measuring the insulation resistance with the insulation resistance. Based on the control of the control device 21, the connection between the deterioration degree detection device 22 and the deterioration degree detection device 22 is turned on and off.
A detection device circuit disconnecting device 23, which is a circuit that operates, is interposed.

Reference numeral 16 is an insulation transformer device. This insulation transformer device 16 changes the commercial power supply 15 to a predetermined voltage for operating the control device 21 and the insulation deterioration degree detection device 22, and at the same time, safeguards these devices. In order to insulate the commercial power supply 15 for this purpose, it comprises a control device insulation transformer 17 for the control device 21 and a small capacity detection device insulation transformer 18 for the insulation deterioration degree detection device 22.

When the insulation transformer device 16 is divided into the control device 21 and the insulation deterioration degree detecting device 22 as described above, the electric power used by the insulation deterioration degree detecting device 22 is smaller than the electric power used by the control device 21. As the insulating transformer 18 for the detection device, it is convenient to use a small-capacity one that matches the amount of power used.

Further, the insulation deterioration degree detecting device 22 has a double sheathed heater 24 which comes into contact with bath water when the insulation deterioration degree is detected.
Since an electric current is applied to the detector, there is concern about leakage at this time.
8 is connected to the control device insulation transformer 17, and has a double insulation structure in which it is connected to the commercial power supply 15 via two insulation transformers connected in series.

Reference numerals 19 and 20 are power supply devices for the control device and the detection device for supplying power to the control device 21 and the insulation deterioration degree detection device 22 by changing the alternating current to the direct current and stabilizing the voltage. .

When the control device 21 and the insulation deterioration degree detection device 22 are operated by alternating current, the power supply devices 19 and 20 for the control device and the detection device are not necessary, and the insulation is highly reliable. If a transformer is used,
As described above, the insulation deterioration degree detection device 22 is connected to the commercial power supply 15
There is no need to double-insulate with two isolation transformers.

The control unit 21 is mainly composed of a microcomputer as a ROM as a data storage unit, a CPU as an arithmetic unit, a program ROM storing an execution program for arithmetic processing, a RAM as a temporary storage unit and the like. The controller 21 controls the entire device.

The control for detecting the degree of insulation deterioration by the control device 21 is performed by a program stored in a program ROM as shown in the flow chart of FIG.

First, as the first step S1, for example, once a day, the insulation degree is detected every 24 hours, and it is checked whether 24 hours have passed since the previous measurement. If 24 hours have passed, the second step S1 is performed. As S2, the detector circuit disconnecting device 23 is turned on to energize the double sheath heater 24 and the insulation deterioration degree detector 22.

Next, in the third step S3, the insulation deterioration degree detection device 22 detects the insulation deterioration degree, and when the detection is completed, the detection device circuit disconnecting device 23 is turned off in the fourth step S4 to turn off the double sheath heater. The energization between 24 and the insulation deterioration degree detection device 22 is stopped.

As a fifth step S5, the detected insulation degree is compared with the stored reference value, and if it is equal to or greater than the reference value, the next detection time is waited for, while if it is equal to or less than the reference value. The sixth step S6 is to turn off the heater energizing / disconnecting device 25 to completely cut off the energization between the heater 24 and the commercial power source 15, and the seventh step S7 is to display an abnormality of the heater on a display device (not shown), The control for detecting the insulation degree of the double sheathed heater 24 is finished.

The control device 21 controls the insulation deterioration degree detecting device 22 so as to energize the double sheath heater 24 only when the insulation deterioration degree is detected. If the insulation transformer 16 has a dielectric breakdown, there is a danger of electric shock.
This is because a current is constantly applied to the metal pipe to prevent holes from being formed and the insulation from being destroyed by electrolytic corrosion.

Further, the heater-containing cutting device 25 is similar to that shown in FIG.
Based on the temperature of the bath water detected by the hot water temperature sensor 11, the control device 21 turns it on and off, and operates to keep the bath water at an appropriate temperature.

FIG. 2 is a block diagram showing the basic structure of the second embodiment of the present invention. The structure of the insulating transformer and the power supply device is different from the block diagram of the first embodiment of FIG. Therefore, only the differences will be described.

In this embodiment, the insulation transformer 26 is composed of a first insulation transformer 27 having a function of transforming the commercial power supply 15 to a required potential together with a function of insulation, and a second insulation transformer 28 having a function of insulation alone in series. Connect to and configure
The power supply device 29 is used for the control device 21 and the insulation deterioration degree detection device 2
The power supply device 20 for the detection device in FIG. 1 is omitted and the insulation transformer device and the power supply device are simplified.

FIG. 3 is a circuit diagram of the basic block diagram of the first embodiment shown in FIG. 1. Next, the details of the first embodiment will be described with reference to this drawing.

First, the power supply device 19 for the control device and the power supply device 20 for the detection device will be described. In these devices, the AC power source reduced to a predetermined voltage by the insulating transformer device 16 is converted to DC by the rectifying diodes 19a, 20a. The ripples of the power source that has been converted into this direct current are converted into capacitors 19b, 20.
The voltage is smoothed by b, and then stabilized by the constant voltage devices 19c and 20c, and the respective power supplies of Vcc for the control device and VD for the detection device are made.

The double sheathed heater 24 has a double-sided relay RY2 as a heater cutting device 25 for heating wire 30.
To detect the insulation resistance of the second electric insulation layer 33, which is the outer electric insulation layer, and is connected to the contact 25a of the first electric connection tube 25a of the first and the second electric insulation tubes 33. Two lead wires 48 and 49 that are electrically connected to the two metal pipes 32 and 34 are connected to the contact 23a of the double-sided relay RY1 as the detector circuit disconnecting device 23.

The insulation deterioration degree detection device 22 is provided with a comparator 22a for detecting the insulation resistance of the second electric insulation layer 33 of the double sheathed heater 24 as a voltage and comparing the detected voltage with a reference value. The comparator 22a outputs a high level signal when the compared voltage is equal to or lower than the reference value and insulation degradation does not occur, and outputs a low level signal when the insulation degradation occurs above the reference value to isolate the insulation. Detect the degree of deterioration.

Further, the insulation deterioration degree detecting device 21 is provided with a photocoupler 22b which once converts the signal output from the comparator 22a into an optical signal and then converts the signal into an electric signal and sends the electric signal to the microcomputer 21a. The power supply Vcc and the detection device power supply VD are prevented from being mixed with each other, and the control device 21 that is not double-insulated by the commercial power supply 15 and the insulation transformer device 16 is insulated from the insulation deterioration degree detection device 22 to improve safety. There is.

The control unit 21 includes a microcomputer 2
1a, a transistor 21b for activating a relay RY2 as a heater enclosing device 25 by a signal from the microcomputer 21a, and a detection device circuit disconnecting device 2
A transistor 21c and the like for activating the relay RY1 as No. 3 are provided.

Explaining the operation of the circuit as described above, the microcomputer 21a operates with the power supply Vcc, outputs a high level signal to the transistor 21c when detecting the degree of insulation deterioration, and turns on the transistor 21c.
To

As a result, the detector circuit disconnecting device 23
As a result, a current flows through the coil 23b of the relay RY1, the contact 23a is closed, and the two lead wires 48 and 49 of the double sheath heater 24 are connected to the insulation deterioration degree detection device 22.

Comparator 2 in the insulation deterioration degree detection device 22
2a is connected in series with the second electric insulation layer 33 with the power supply as VD, and the voltage VB across the terminals of the resistor 22c that changes in proportion to the change in the insulation resistance of the second electric insulation layer 33 is applied to the resistors 22d and 22d. 22e is used as a reference voltage V set in advance.
The second electrical insulating layer 33 is compared with A to detect the degree of insulation deterioration.
When the insulation resistance is high and VB is lower than VA, a high level signal is output and the photocoupler 22b is turned on.

When the photo coupler 22b is turned on, the control device 2
A low level signal is input to the first microcomputer 21a, and it is detected that the second electric insulation layer 33 of the double sheathed heater 24 has not been insulation deteriorated.

In this way, when it is detected that the second electric insulation layer 33 of the double sheathed heater 24 is not deteriorated in insulation, a high level signal is output from the microcomputer 21a to the transistor 21b, and this transistor 21b. Turn on.

When the transistor 21b is turned on, a current flows through the coil 25b of the relay RY2, which is a double-sided switching device 25 as the heater enclosing device 25, and the contact 25a is closed, so that the heating wire 30 and the commercial power supply 15 are energized in the double sheath heater 24.

Second electric insulation layer 3 of double sheathed heater 24
When 3 is destroyed and the insulation resistance decreases and VB becomes higher than VA, the comparator 21a outputs a low level signal, turns off the photocoupler 21b, and outputs a high level signal to the microcomputer 21a of the controller 21. Detects that insulation deterioration has occurred.

As a result, the microcomputer 21a
A low level signal is output to the transistor 21b to turn off the transistor 21b, thereby cutting off the current to the coil 25b of the relay RY2 as the heater enclosing device 25.

As a result, the contact 2 of the double-cut relay RY2
5a is opened, and the double sheathed heater 24 completely disconnects the heating wire 30 and the commercial power supply 15 from each other and displays an abnormality on a display device (not shown).

The relay RY2 as the heater enclosing device 25 is also turned on by the control device 21 by the signal from the hot water temperature sensor 11 provided in the circulation path of the bath water.
When it is turned off N, and when the detection of the degree of insulation deterioration is completed, the microcomputer 21a outputs a low level signal to the transistor 21c to turn off the transistor 21c.
As a result, the current to the coil 23b of the relay RY1 as the detection device circuit disconnecting device 23 is cut off and the contact 23a is cut off.
Open, the insulation deterioration degree detection device 22 and the double sheathed heater 2
The power supply to the insulation resistance measuring leads 48 and 49 of No. 4 is cut off.

Next, FIG. 4 showing a basic block diagram of the second embodiment of FIG. 2 as a circuit diagram will be described.

In FIG. 4, the isolation transformer device 26 is
As described above, the first insulation transformer 27 and the second insulation transformer 28, which are two insulation transformers having the same capacity, are connected in series, and the power supply device 29 includes the rectifying diode 29a, the capacitor 29b, and the constant current transformer 29b. It is composed of a voltage device 29c and the like, and produces Vcc which is a common power source for the control device 21 and the insulation deterioration degree detection device 22.

In the circuit of FIG. 4, the power supply for the control device 21 and the insulation deterioration degree detection device 22 is thus made common, and as a result, the comparator 2 of the insulation deterioration degree detection device 22 is changed from the circuit of FIG.
2a and the photocoupler 22b are omitted.

In this way, the circuit in which the comparator 22a and the photocoupler 22b are omitted from the insulation deterioration degree detecting device 22 is the photocoupler 22b because the control device 21 is doubly insulated from the commercial power supply 15. This is because there is no need for insulation, and the data detected by the insulation deterioration degree detection device 22 can be directly compared with the reference value by the microcomputer 21a without passing through the comparator 22a because the power source is common.

The operation for detecting the degree of insulation deterioration will be described with reference to FIG. 4. The insulation deterioration degree detection device 22 uses the microcomputer of the control device 21 when the insulation layer 33 outside the double sheathed heater 24 is not deteriorated. A low level signal is output to 21a, and a high level signal is output when the signal is deteriorated.

Based on the signal from the insulation deterioration degree detection device 22, the control device 21 controls to open and close the relay RY2 as the heater enclosing device 25 as in the case of FIG.

Next, the structure of the double sheathed heater 24 as the multiple sheathed heater will be described with reference to FIGS.

FIG. 5 is a side view showing a part of the double sheathed heater 24 as a cross section, where 30 is a heating wire such as a nichrome wire, and 31 is a first conductive coating tube covering the heating wire 30. 1 is a first electric insulation layer formed by filling voids of the metal pipe 32 with electric insulation powder, and 33 is the first metal pipe 32.
Metal pipe 34 as an electrically conductive cladding that covers the outside of the
Is a second electric insulation layer formed by filling the voids with electric insulation powder, and the heating wire 30 is double-insulated by the first electric insulation layer 31 and the second electric insulation layer 33.

The electrically insulating powder that fills the voids of the first and second metal pipes 32 and 34 as the electrically conductive coating tube to form the electrically insulating layers 31 and 33 is an electrically insulating powder such as magnesium oxide. A metal oxide powder is used, and as the metal pipes 32 and 34, a metal such as SUS or copper having high mechanical strength and corrosion resistance is used.
The first metal pipe 32 on the inner side is the second metal pipe 3 on the outer side.
Since the strength and the corrosion resistance are not required, the wall thickness can be reduced or a material having a low corrosion resistance can be used.

Reference numeral 35 is a heater terminal having a threaded portion which is spot welded to the heating wire 30, and 36 and 37 are electric insulating layers 31, which are provided at the end openings of the first and second metal pipes 32 and 34.
Glass, a sealing material such as silicone rubber, which blocks the insulating material powder filled in the voids to form 33 so as not to leak, and 38 is a mounting flange which is mounted by fitting the second metal pipe with a screw portion. .

FIG. 6 is a partial side view showing a state where the heater is attached to the attachment plate.
No. 4 is attached to the heater mounting plate 39 after the flange portion of the mounting flange 38 is brought into close contact with the water leakage prevention packing 40, and then the heater mounting nut 41 is fitted to the screw portion and screwed.

Reference numeral 42 is a first insulation resistance measuring terminal, 43 is a spacer made of an insulating material such as ceramic or glass.
The insulation resistance measuring terminal 42 is attached by fitting a spacer 43 to the opening end of the first metal pipe 32 and pressing the spacer 43, and then fitting a nut 44 into the threaded heater terminal 35 and screwing it. .

Reference numeral 45 denotes 100 fitted in the heater terminal 35.
It is a power source terminal connected to a general commercial power source such as V or 200V, and is pressed against the nut 44 by a nut 46 and screwed.

Reference numeral 47 denotes a second heater mounted on the heater mounting plate 39.
Insulation resistance measuring terminal, second insulation resistance measuring terminal 4
In principle, 7 is attached to a conductive component such as a mounting flange 38 directly attached to the second metal pipe 34, but is a heater mounting plate that is electrically connected to the second metal pipe 34 via the mounting flange 38. It goes without saying that even if it is attached to 39, it does not hinder the measurement of the insulation resistance.

The double sheathed heater 2 constructed in this way
The insulation resistance of the second electric insulation layer 33, which is the outer insulation layer of 4, is electrically connected to the first insulation resistance measuring terminal 42 and the second metal pipe 34, which are electrically connected to the first metal pipe 32 as a conductive coating tube. A lead wire 48 from the second insulation resistance terminal 47,
49 is connected to the insulation deterioration degree detection device 22 and is measured as described above.

[0070]

As described above, the present invention has the above-described structure and operation and is in a state in which there is almost no danger of electric leakage, and even if a little abnormality occurs in the insulating property of the electric insulating layer, this can be detected quickly. So that the electric heater can be directly connected to the commercial power supply.

As a result, a large capacity heater can be used,
To easily provide a bath water heating device that is compact, low cost, and highly safe.

The heating device of the present invention was developed for heating bath water, which is required to completely prevent electric leakage and maintain extremely high safety. It goes without saying that the present invention can also be used effectively for equipment such as fish breeding equipment that requires high safety in the same way as heating equipment.

[Brief description of drawings]

FIG. 1 is a basic block diagram of the first embodiment,

FIG. 2 is a basic block diagram of the second embodiment,

FIG. 3 is a circuit diagram of the first embodiment,

FIG. 4 is a circuit diagram of a second embodiment,

FIG. 5 is a side view of the double sheathed heater,

FIG. 6 is a mounting diagram of a double sheath heater,

FIG. 7: Flow chart for detecting insulation deterioration degree,

FIG. 8 is a device for cleaning bath water.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bath 2 Bath water 3 Cleaning device 9 Heating device 15 Commercial power supply 16 Insulation transformer device 21 Control device 22 Insulation deterioration detection device 23 Detection device circuit disconnection device 24 Double sheath heater 25 Heater cutting device 26 Insulation transformer device 30 Heating wire 31 1st electrical insulation layer 32 1st metal pipe 33 2nd electrical insulation layer 34 2nd metal pipe

Claims (3)

(57) [Claims] 1. A metal pie in which heating wires are multiply covered with a metal pipe.
The voids in the stack are filled with electrical insulation material and multiple electrical insulation layers are used.
Insulated multi-sheath type electric heater in bath water circulation
In the installed bath water heating device,
Sandwich this electrical insulation layer against the outermost electrical insulation layer of the edge layer
Attached to a metal pipe or a conductive member in close contact with the metal pipe
Insulation deterioration degree detection device via the insulation deterioration degree measurement terminal
A bath water heating device characterized by being installed. 2. The insulation deterioration degree detecting device comprises an insulation deterioration degree detecting device.
In order to prevent electric shock due to the leakage of the intelligent device itself,
Insulated power supply is connected, and energization is controlled by the controller
Detection device circuit disconnection device
Connected to the insulation deterioration measurement terminal for the outer electrical insulation layer
The heating device for bath water according to claim 1, wherein 3. The electric heater has an insulating layer whose insulation has deteriorated.
Power to the heater when the insulation deterioration detector detects
Turn off the hot and ground sides of the supply line at the same time to supply power.
In order to completely cut off the power supply,
Openable and closable by control of control device based on edge deterioration detection signal
Connected to a commercial power source via a cutting device with double-sided heater
The bath water addition according to claim 1 or 2, wherein
Thermal device.