JPH1047759A - Heat insulating/purifying apparatus for hot water in bathtub - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure satisfactory massage effect with an enough strong jetting flow from an injection pipe upon bathing while reducing power consumption and an operation sound by a circulation pump and improving purifying efficiency by an aerobic bacteria in purifying means in non-bathing. SOLUTION: The present temperature insulating/purifying apparatus includes a circulation pump for circulating bathtub loot water, a heater for heating the circulated hot water with the circulation pump, purifying means for purifying the circulated hot water, and an injection pipe connected with the circulation pump and opened into a bathtub. In this case, there is provided a circulation pump capacity changeover part 61 which changes over a state where the capacity of the circulation pump PW is increased in response to selection of a bathing state in selection switches 641, 642 and a state where the capacity of the circulation pump PW is decreased in response to selection of a non-bathing state with the same switches.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating pump for circulating bath water, a heater for heating the circulating water by the circulating pump, and a heater for purifying the circulating water.
The present invention relates to a bathtub hot water retention / purification device including a purifying means in which aerobic microorganisms can propagate, and an ejection pipe connected to a circulation pump and opened in the bathtub.

[0002]

2. Description of the Related Art Conventionally, such an apparatus is known, and circulating hot water in a bath tub is circulated by a circulating pump while purifying the circulating hot water by a purifying means and heating by a heater so that clean hot water at an appropriate temperature is always kept in the bath tub. The massage effect is obtained in the bathtub by vigorously jetting out circulating hot water from the jet pipe into the bathtub.

[0003]

In the above-mentioned conventional heat retaining / purifying apparatus, a circulating pump having a constant capacity is used, so that the hot water always circulates at a constant circulating speed irrespective of bathing / non-bathing. However, when the circulation speed is set relatively high, a relatively strong jet can be ejected from the ejection pipe, which has an advantage that a sufficient massage effect can be obtained at the time of bathing. Since the circulation rate of hot water is high, aerobic microorganisms do not sufficiently adhere to and stay in the purification means, and it is difficult to promote the propagation of the microorganisms in the purification means and improve the purification efficiency. Despite the time, the circulation pump is operated at an unnecessarily high speed, which is disadvantageous in reducing the operation noise and saving power. In order to eliminate such a drawback, when the circulation speed of the hot water is set relatively low,
The jet from the jet pipe is weak, and a sufficient massage effect cannot be obtained when taking a bath.

[0004] The present invention has been made in view of the above circumstances, and by changing the operation mode according to the selection between bathing and non-bathing, the above contradictory problems can be solved at once, the heat retention of bath water.・ To provide a purification device.

[0005]

To achieve the above object, the present invention provides a circulating pump for circulating bath water,
A heater for heating the circulating hot water by the circulating pump,
For purifying the circulating hot water, the circulating pump includes a purifying means in which aerobic microorganisms can grow, and an ejection pipe connected to the circulating pump and opened in the bath tub. In the bath tub hot water keeping / purifying device which is capable of constantly storing clean water at an appropriate temperature in the bath tub by purifying with the purifying means and heating with the heater while circulating, the circulating pump has a large or small capacity. The control device, which is configured to be switchable and controls the operation of the circulation pump,
A selection switch for selecting a bathing state and a non-bathing state,
A first switching state in which the capacity of the circulation pump is increased in accordance with the selection of the bathing state by the selection switch so that a sufficient massage effect by the hot water from the jet pipe is obtained, and the selection switch. As the non-bathing state is selected, the capacity of the circulation pump is reduced and the flow rate of the hot water in the purifying means is made smaller than that in the first switching state, whereby propagation of aerobic microorganisms in the purifying means is reduced. And a circulating pump displacement switching section that selectively switches to a second switching state that is promoted.

According to the above feature, when the bathing state (first switching state) is selected by the selection switch, the capacity of the circulation pump is increased, and a sufficient massage effect by the hot water from the jet pipe is obtained. When the non-bathing state (second switching state) is selected by the selection switch, the capacity of the circulating pump is reduced, and the flow rate of hot water in the purifying means is made smaller than that during bathing (during the massage). This promotes the propagation of aerobic microorganisms.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on embodiments of the present invention illustrated in the accompanying drawings.

In the accompanying drawings, FIG. 1 is a cutaway perspective view of a bathtub, showing an installed state of the bathtub according to one embodiment of the present invention.
2 is an enlarged sectional view taken along line 2-2 of FIG. 1 (a sectional view taken along line 3-3 in FIG. 3), FIG. 3 is a cutaway front view of a rear case half taken along line 3-3 in FIG. 3 is a bottom view of the purification case viewed from the direction of arrow 4 in FIG. 3, FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG.
Is a block diagram showing the configuration of the control device, and FIG. 7 is a front view of the control box.

First, in FIG. 1 to FIG._BUchinoyu
Bath tub V to purify while keeping_BInside
Is a detachable cleaning case C made of hard synthetic resin
Is done. This purification case C is a front case half C_FAnd
And rear case half C_ROpen and close freely to join the two palms
It is formed in a closed shape. Thus, the front case half C _F
Has a spout at the center of the front to blow clean water
4 is opened, and suction ports 5 and 5 are opened on both sides of the lower edge.
Mouth. Also the rear case half C_RThe back of the
Panels 6 are attached, and rear suckers 6
Half body C_RThat is, the cleaning case C is the bathtub V_BWear inside
Adsorbed and held detachably. More rear case half C_Rof
On the back, a generally U-shaped invitation along the left, right, and lower edges
A control groove provided with a guide groove 7 and installed outside the bathroom
Box B_CThe cabtire cable 8 extended from
The cabtire cable 8 is received in the guide groove 7 and
The end is introduced into the purification case C.

Rear case half C_RExtends forward at the bottom of
A pair of hinge pieces 10, 10 are integrally provided,
Front case half C_FAt the lower end through a hinge pin 11
Respectively, and are pin-connected to the hinge pieces 10, 10, respectively.
Thereby the front case half C _FIs the rear case half C_RTo
On the other hand, it can be opened and closed up and down around the hinge pin 11.

[0011] On the inner surface of the rear case half C _R, a plurality of left and right side ribs 20 ... are protruded respectively integrally in parallel to each other spaced 21 ... are vertically thereof left, right lateral ribs 20 ... on the inner surface of the rear case half C _R at the central portion between 21 ..., left, right transverse ribs 20 ..., sectional channel-shaped passage wall member extending longitudinally across 21 ... 2
2 are fixed by a plurality of screws 23.

In the rear case half C _R , the left and right upper storage spaces 16 and 17 and the left and lower right space 18 are formed by the peripheral wall 23, the partitions 14 and 15, and the passage wall member 22. , 19 are defined, and the passage component 2
2 and cleaning water passage 23 defined between the rear case half C _R inner surface of the passage by the left and right edges of the passage wall member 22 straddles the left and right side ribs 20 ..., 21 ... a Wall member 2
Left through the inlet 24 ₁ ... formed between the second lateral edge and a rear case half C _R inner surface of the right upper accommodation space 1
6, 17 are communicated.

[0013] Left and right upper accommodation space 16, 17 left, right purifying means F _L, F _R is detachably respectively accommodated, the circulation pump P _W and the wire on the lower left portion housing space 18, a line such as a pipe Connector box 2 for collectively connecting strips
5 is housed supported, electric heater H _E is accommodated supported on the right lower receiving space 19.

[0014] Left purifying means F_LAnd right purifying means F_RIs
Left purification means F_LIs the right purification means F _RLonger than vertical
Although the basic configuration is the same,
Purification means F_RTo explain the structure of this right purifying hand
Step F_RIs a filter unit 26 and an activated stone unit
27 are superposed on each other. filter
The unit 26 is a rectangular frame 2 made of stainless steel.
8 is loaded with a fiber filter 29 such as a glass fiber.
The fiber filter 29 is formed in a flat shape.
It is exposed flat on both sides. Thus the fiber filter
29 has the function of filtering unclean water
Aerobic inside the filter 29 as described later.
It also serves to provide an environment in which microorganisms can propagate. Also
The activated stone unit 27 is a frame of the filter unit 26.
The activity of barley stone and the like in a rectangular frame 30 similar to the body 28
The stone 31 is loaded, and wire mesh etc. on both sides of the frame 30
Are flattened by stretching the mesh plate 32 of FIG.

The activated stone 31 such as barley stone elutes natural minerals into hot water passing therethrough, and has a function of adsorbing and decomposing polluting substances and organic substances which cannot be filtered by the filter unit 26.

The left and right purifying means F_L, F_RIs the rear
Half body C_RPeripheral wall 13, partition walls 14, 15 and passage wall
Elastic packings 33 are interposed between the member 22 and
To the left and upper right storage spaces 16 and 17, respectively.
These left and right purifying means F_L, F_Rof
Back and rear case half C_RBetween the left and right sides
The ribs 20..., 21._L, F_ROn the back of
By contact, a plurality of flat clean water chambers 34 are formed.
, And the clean water chambers 34. ₁Through ...
Then, it is communicated with the clean water passage 24.

[0017] the inner surface of the front case half body C _F is left, right purifying means F _L, a plurality of ribs 35 in contact with the front surface of the fiber filter 29 ... in F _R ... are integrally projects,
Front and rear case half C _F, C _R and closed when sealing the clean case C, each rib 35 ... is the front case half C _F
And left, right purifying means F _L, to form a 37 ... flat uncleaned water chamber between F _R.

Further, hot water inflow passages 38, 38 for connecting the suction ports 5, 5 to the uncleaned hot water chambers 37 are formed inside the left and right sides of the purification case C.

The suction port 40 of the circulation pump P _W stored and supported in the lower left storage space 18 is connected to the clean hot water passage 24 through a connecting pipe 41, and the discharge port 4 of the circulation pump P _W
2 is connected to the ejection pipe 43. Thus to該噴extraction pipe 43 is opened to the bathtub V _B through the ejection port 4 is opened to the front center portion of the front case half C _F.

The right lower receiving space 19 within the housing supported by and electric heater H heating chamber 45 of the _E is communicated with the connecting pipe 41 via a flexible pipe 46 with communicated in hot water in the purification case C You. Therefore, the hot water heated to an appropriate temperature in the heating chamber 45 is sucked into the suction system of the circulation pump _PW .

A connection hose 44 extending from the connector box 25 is connected in the middle of the jet pipe 43. As shown in FIG. 5, a pipe 47 surrounded by a plurality of electric cables is disposed in the cabtire cable 8 connected to the connector box 25. The box 47 is connected to the pipe 47 in the box 25, and the pipe 47 is connected to an ozone generator 50 described later.

[0022] In FIG 6, wherein the cleaning case C, a temperature detector 51 for detecting the water temperature in the bathtub V _B, bathtub V _B
A water level detector 52 for detecting the water level in the inside is provided, and the electric wires connected to the circulation pump P _W , the electric heater H _E , the temperature detector 51 and the water level detector 52 are cabtyres. It is connected to the control unit 53 in the control box B _C via a cable 8. Ozone generator 50 in the control box B in _C also is disposed.

The ozone generator 50 has a corona discharge section 56 connected to a high-pressure generation section 55 housed in an ozone generation chamber 58 formed in a housing 57, and the ozone generation chamber 58 is connected via an air filter 59. And is connected to the pipe 47. By activating the high-pressure generating section 55 to generate corona discharge in the corona discharge section 56, the ozone generated in the ozone generating chamber 58 is removed together with the air purified by the air filter 59 into the pipe 4.
7 and the connection hose 44 to the ejection pipe 43, and within the cabtire cable 8, the pipe 47
The air generated by the heat generated by the electric wires around the air will be heated.

The control device 53 includes a circulation pump P_WThe capacity of
A circulation pump capacity switching unit 61 for switching, and ozone generation
Ozone generation switching section 62 for switching the operation and stop of the creature 50
And electric heater H_ESwitch between on and off states
Heater on / off switching section 63 and their switching sections 6
Microcontroller for giving control signals to 1, 62 and 63
Central processing unit CPU consisting of a computer,
Bathing selection switch 64 for manually selecting a non-bathing state₁You
And non-bathing selection switch 64_TwoAnd bathtub V_BThe hot water inside
Temperature setting switch 65 for setting₁And for cooling
Setting switch 65 _TwoAnd a temperature display section 66.

The temperature detector 51 is connected to a central processing unit CPU via an amplifier 67. Also, the respective switches 64 _1, 64 _2, 65 _1, 65 ₂ and the water level detector 52
Is connected to the central processing unit CPU via the buffer circuit 68.

By the way, the AC power supply has an earth leakage breaker 69.
It is connected to the primary coil of the transformer 70 via an electric heater H _E and the circulation pump P _W is connected to the secondary coil 70a of the transformer 70.

The circulation pump P _W is configured so that its capacity can be switched between large and small. That is, the circulation pump P _W
Switches between a state in which the capacity is increased by connecting between both ends of the secondary coil 70a and a state in which the capacity is reduced by connecting between one end of the secondary coil 70a and an intermediate portion thereof. Switching is performed by the function of the unit 61. The circulating pump displacement switching unit 61 includes an inverter 72, a delay circuit 73, an inverter 74, and a relay coil 75. A DC circuit connected to the output terminal 71 of the central processing unit CPU and the DC power supply 81, a delay circuit 77, an inverter 78 and a relay coil 79, and a series circuit connected in parallel to the DC circuit, and the other end of the secondary coil 70a of the transformer 70 and the circulating pump P _W to conduct according to the excitation of the relay coil 75. And a secondary switch 7 in the transformer 70 for conducting in response to the excitation of the relay coil 79.
0a and a relay switch 80 interposed between the circulation pump _PW .

The central processing unit CPU has a bathing selection switch 6
4 and outputs a high level signal to the output terminal 71 in response to the non-bathing selection switch 64 ₂ ON outputs a low level control signal to the output terminal 71 in response to the _first on-bathing selection switch 64 _{When 1} is on, the relay coil 75 is excited and the relay switch 76 conducts,
The circulating pump P _W is connected between both ends of the secondary coil 70a in the transformer 70, so that the capacity of the circulating pump P _W becomes large. When the non-bathing selection switch 64 ₂ is turned on, the relay coil 79 is excited to turn on the relay switch. 80 is conducted, and the circulating pump P _W is connected between one end and the intermediate portion of the secondary coil 70a in the transformer 70, and the capacity of the circulating pump P _W is reduced. The delay circuits 73 and 77
This is to prevent an inrush current at the time of on / off switching.

The ozone generation switching section 62 includes a central processing section CP.
An inverter 83 and a relay coil 84 connected in series between the U output terminal 82 and the DC power supply 81, and a relay switch 85 interposed between the high voltage generator 55 and the earth leakage breaker 69 in the ozone generator 50; The relay switch 85 is turned on in response to the excitation of the relay coil 84.

[0030] Thus by the central processing unit CPU outputs a control signal of a high level that lasts for a certain time, for example 30 minutes from the output terminal 82 according to the on bathing selection switch 64 _1, the non-bathing selection switch 64 ₂ When turned on, a low-level signal that lasts for, for example, 15 minutes is output from the output terminal 82 immediately after that, and a low-level signal that lasts for, for example, 5 minutes per hour is repeatedly output from the output terminal 82. It is. Therefore, when the bath selection switch 64 ₁ is turned on, the relay coil 84 is demagnetized continuously for, for example, 30 minutes. During that time, the relay switch 85 is turned off and the ozone generator 5 is turned off.
Ozone generation at zero is stopped. When the non-bathing selection switch 64 ₂ is turned on, the relay coil 84 is energized for, for example, 15 minutes, and thereafter, the relay coil 84 is energized for, for example, 5 minutes per hour. Accordingly, the relay switch 85 is turned on, and ozone is supplied from the ozone generator 50.

The heater ON / OFF switching unit 63 includes an inverter 88 and a relay coil 89 connected in series between the output terminal 87 of the central processing unit CPU and the DC power supply 81,
Secondary coil 70a of transformer 70 and electric heater H
_And a relay switch 90 interposed between _{E. The} relay switch 90 is turned on in response to the excitation of the relay coil 89.

[0032] Thus by the central processing unit CPU, a temperature set by the Atsushi Nobori for setting switch 65 ₁ and cooled for setting switch 65 _2, according to the difference between hot water temperature Metropolitan detected by the hot water temperature detector 51 , when it should perform heating by the electric heater H _E is caused to conduct the relay switch 90 outputs a control signal of low level to the output terminal 87, a control signal of high level to the output terminal 87 when the should stop warming Outputs to shut off the relay switch 90.

[0033] For heating setting switch 65 ₁ is a pushbutton switch for heated by setting the temperature for example 1 degree, also lowering a setting switch 65 _2, for the temperature is lowered by setting the temperature for example one degree It is a push button switch. On the other hand, the temperature display section 66 is connected to the central processing unit CPU via the data bus 91, and has a two-digit "day" 7-segment numeric display section 92, 93 for displaying a set temperature. Decoders 94 and 95 individually connected to these display units 92 and 93, and both decoders 94 and 95
And a two-digit "day" 7-segment numeric display section 97, 98 for displaying the measured temperature.
And decoders 99 and 100 individually connected to the display units 97 and 98, and a latch circuit 101 common to both decoders 99 and 100.

[0034] Thus by the central processing unit CPU, a latch signal for displaying the set temperature corresponding to the temperature increase for the setting switch 65 ₁ and cooled for setting switch 65 ₂ of the manual operation on both numeral display section 92, 93 The circuit 96 supplies the hot water temperature detector 52
Is supplied to the latch circuit 101 to display the hot water temperature detected by the two numbers display sections 97 and 98.

Furthermore the central processing unit CPU in accordance with a signal inputted from the water level detector 52, when the water level in the tub V _B is equal to or less than a predetermined value, the circulation pump P _W, an ozone generator 50 and the electric heater H A signal for forcibly stopping the operation of _E is output from the output terminals 71, 82, 87.

In FIG. 7, on the surface of the control box _BC , there are provided a power switch 102 for turning on / off the AC power supply of the control device 53, and the switches 64 ₁ , 64 ₂ ,
65 _1, 65 and _2, each digit display unit 92,93,97,9
8, a lamp 103 that the electric heater H _E is illuminated when in the ON state, the lamp 104 lights up when the ozone generator 50 is in the ozone generation state, lights when the circulation pump P _W is operating Lamp 105 is provided.

Next, the operation of this embodiment will be described.
And the circulation pump P_WWhen the bathtub V_BThe hot water inside sucks
It is sucked into the purifying case C from the inlets 5 and 5, and the arrow in FIG.
As shown by a, it passes through the hot water inflow passages 38, 38 on both left and right sides.
And flows into the uncleaned hot water chamber 37. Next, uncleaned hot water chamber 37
The hot water is supplied to the purifying means F as shown by the arrow b in FIGS.
_L, F_RFilter unit 26 and activated stone unit
27, filtration action and activity in fiber filter 29
Clean water purified by the adsorption and decomposition action of stone 31
It flows into the clean water chamber 34, and further as shown by the arrow c in FIG.
The hot water flowing from the hot water chamber 37 to the hot water passage 24
Is a circulating pump P via a connecting pipe 41_WIs sucked. Also
Circulation pump P_WHas an electric heater H_EHot water heated at
Circulating pump P which is sucked through the flexible pipe 46_WOr
Are heated to an appropriate temperature and the purified hot water is discharged.
And the bathtub V_BSquirted into. And jet
By the ejector action in the outlet pipe 43, the ozone generator 5
0 is sucked into the ejection pipe 43 and the ejection pipe 43
From this, clean water containing air bubbles is ejected.

By the way, at the time of bathing, the bathing selection switch 64
_{When 1} is turned on, the capacity of the circulation pump P _W is increased, and the ozone generation in the ozone generator 50 is stopped for, for example, 30 minutes. Therefore, air bubbles not containing ozone are jetted out of the jet pipe 43 vigorously, and a sufficient massage effect can be obtained while avoiding the adverse effect of ozone on the human body.

When the non-bath selection switch 64 ₂ is selected after bathing, the capacity of the circulation pump _PW is switched to a small value, and ozone is generated in the ozone generator 50. with bubbles weak jet containing ozone will be injected into the bath V _B. Moreover Immediately after selecting the non-bathing selection switch 64 _2, ozone persisted only example 15 minutes is blown into the bath V _B, so that the sterilization of water soiled by bathing is performed immediately.

[0040] By selection of such non-bathing selection switch 64 _2, together with the time of non-bathing can be obtained sterilizing effect of ozone can be suppressed wasteful power consumption by the circulating pump P _W. Further, by the capacity of the circulation pump P _W becomes small, the operation sound of the circulation pump P _W is also reduced, which can contribute to reduced operating noise at the time of non-bathing.
Moreover purifying means F _L, the fiber filter 29 in F _R, by velocity of the hot water is relatively small, it is possible to obtain a suitable environment for propagation of aerobic microorganisms, to facilitate the propagation of aerobic microorganisms Thereby, the organic purification action of the uncleaned hot water can be promoted, and the purification efficiency can be improved.

In the above embodiment, the purifying means F_L, F_R,
Circulation pump P_WAnd electric heater H _EBuilt-in purifier
Bath C to Bath C_BHeat insulation / purification equipment installed inside
Although the present invention has been described, the present invention_L,
F_R, Circulation pump P_WAnd electric heater H_EEtc. in bathtub V
_BAppropriate for thermal insulation / purification equipment installed outside
Is available.

[0042]

As described above, according to the present invention, when the bathing state (first switching state) is selected by the selection switch, the capacity of the circulation pump is increased, and the capacity of the circulating pump is increased. When a sufficient massage effect is obtained and the non-bathing state (second switching state) is selected by the selection switch, the capacity of the circulating pump is reduced, and the flow rate of hot water in the purifying means is reduced. Since the propagation of aerobic microorganisms is promoted by making it smaller than the above (during the massage), the circulation speed of the hot water becomes sufficiently high at the time of bathing, and the bather is given a sufficiently strong jet effect from the spouting tube. It is possible to massage effectively, while at the time of non-bathing, the circulation speed of hot water is made slower than at the time of bathing (that is, at the time of massage), so that aerobic microorganisms can be sufficiently attached to and retained on the purification means. Therefore, the propagation of the microorganisms in the purification means is promoted, which can contribute to the improvement of the purification efficiency of the circulating hot water. In addition, the power consumption and operation noise of the circulating pump during non-bathing can be reduced, so that the Inconvenience caused by the operation of the circulation pump can be minimized even in the bathing state.

[Brief description of the drawings]

FIG. 1 shows a state of installation in a bathtub according to one embodiment of the present invention.
Notched perspective view of bathtub

2 is an enlarged sectional view taken along line 2-2 of FIG. 1 (a sectional view taken along line 3-3 of FIG. 3);

3 is a cutaway front view of the rear case half taken along the line 3-3 in FIG. 2;

FIG. 4 is a bottom view of the purification case viewed from the direction of arrow 4 in FIG. 3;

FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is a block diagram showing a configuration of a control device.

FIG. 7 is a front view of a control box.

[Explanation of symbols]

43 ... Ejection tube 53 ... Control device 61 ... Circulation pump capacity switching section 64 ₁ , 64 ₂ ... Selection switch, _FL , F _R ... Purification means HE _E ........ Heater P _W ... Circulation Pump V _B ...... Bathtub

Claims (1)

[Claims] 1. A circulation pump for circulating bath water
(P_W) And the circulation pump (P_W) By circulating hot water
Heater (H_E) And purifying the circulating hot water
Purifying means (F_L,
F_R) And a circulation pump (P_W) And a bathtub (V_B)
And an ejection pipe (43) opened in the inside, even in a non-bathing state
The bathtub (V_B) To the circulation pump (P_WBy)
The cleaning means (F_L, F_R) And purify
The heater (H_E) So that the bathtub (V
_BBathtub that can always store a suitable temperature of clean water inside
In the hot water insulation / purification device, a circulation pump (P_W) Is configured so that the capacity can be switched between large and small.
And a circulation pump (P_WControl device (53) for controlling the operation of (3)
Is a selection switch to select between bathing state and non-bathing state
(64₁, 64_Two) And the selection switch (64 ₁, 64
_Two), The circulation pump (P
_W)) And the spouting water from the spouting pipe (43)
No.1 to obtain a sufficient massage effect by
And the selection switch (64₁, 6
4_Two) In the non-bathing state is selected according to the circulation pump
(P_W) Is reduced to a smaller volume and the purifying means (F_L, F_R)
The flow speed of the hot water at the first switching state.
The purifying means (F_L, F_RAerobic microbes in
Selective to a second switching state designed to promote product propagation
And a circulating pump displacement switching unit (61) for switching to
A heat retention / purification device for bath water.