JPH02225946A - Bath furnace with hot-water heater - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic bath that automatically fills a bathtub with hot water.

BACKGROUND OF THE INVENTION Conventionally, this type of bathtub with water heater has adopted an fxte structure as shown in FIG. 5, for example.

To explain the details, 1 is a bath pot with a water heater, and it has a built-in heat exchanger 2 for hot water supply and a heat exchanger 3 for reheating the bath, and is used for supplying hot water to the kitchen and shower, and for refilling the bath. . First, let's start with water supply.

A bathtub l with a water heater is installed by a water supply pipe 3 connected to a water pipe.
When the water is introduced, it passes through a water flow sensor 4, a water flow proportional valve 5, and is supplied to a heat exchanger 2 for hot water supply. The hot water heated through the hot water heat exchanger 2 passes through the hot water pipes A and 6, and then the hot water pipes are led to the hot water pipes B and 8, which are connected to the tank 7, and the hot water tap 9, which is installed in the kitchen, etc. Branch part 1 to C.10
It is branched at 1. There is an automatic hot water supply solenoid valve 12 at the end of the hot water supply pipe B.8, and a tank 7 is provided at the end of this solenoid valve 12.

An upper float switch 13 and a lower float switch 14 are provided in the tank 7 to control the water level in the tank 7. Hot water from the tank 7 exits the hot water pipe D-15 and is led to the pump 17 via the three-way valve 16. The hot water sent out by the pump 17 is led to a bath pipe 19 via a reheating heat exchanger 18, and then supplied to a bathtub 21 by a bath adapter 20. The hot water accumulated in the bathtub 21 is returned by a bath return pipe 22 and returned to the three-way valve 16 via a water level sensor 23.

Problems to be Solved by the Invention However, with the above configuration, if the bathtub and the bathtub with water heater are far apart, there is a problem that it takes too much time to automatically fill the bathtub with hot water unless the capacity of the pump is increased. Ta. Naturally, increasing the capacity of a pump also increases noise and vibration, which necessitated the need for measures to reduce noise and dampen vibrations. Furthermore, the distance between the bathtub 21 and the bathtub 1 with a water heater is often required to be as short as 1 m and as far as 20 m, so the conveying capacity of the pump 17 changes depending on the distance. , tank water level HjB
had to become complicated. For example, if the automatic hot water supply solenoid valve 12 is closed when the water level in the tank 7 reaches the upper float switch I3, and the operation of the pump 17 is stopped when the water level in the tank 7 drops to the lower float switch 14, the operation of the pump 17 is stopped. If the distance between 21 and the bath pot l with water heater is short, the pump 17 will be turned on and off slowly, and the automatic hot water supply solenoid valve I2 will be turned on and off accordingly.
Because of this, the reliability and durability of the pump and automatic hot water supply solenoid valve were sometimes compromised.

The present invention solves the above-mentioned conventional problems, and aims to automatically supply hot water to a bathtub using the water supply pressure of the tap water, and use the pump only to stir the inside of the bathtub.

A second purpose is to prevent bath water from mixing with the hot water supply even if the water flows back toward the hot water supply side.

Means for Solving the Problems In order to achieve the first object, the present invention branches from the outlet side of a heat exchanger for hot water supply connected to a water supply pipe, and connects a hot water tap to one of the branched water supply pipes. A three-way valve is connected to the other hot water supply pipe via a hot water supply solenoid valve, and each outlet of the three-way valve is connected to a bathtub and a bathtub connected to the bathtub via a bath heat exchanger. The three-way valve is connected to a return pipe via a water level sensor and a circulation pump in the middle, and the three-way valve is a bath kettle with a water heater that connects the other hot water pipe to the bath pipe when hot water is supplied.

Further, second to fourth means for achieving the second objective are as follows.

The second means is arranged between the solenoid valve for hot water supply and the three-way valve, and a first check valve, a vacuum breaker, a second
The check valves are arranged in series in this order, and are spaced a certain distance from the bathtub.

A third means is to provide a vacuum breaker, a first check valve, and a second check valve in series between the hot water supply tm valve and the three-way valve in order from the hot water supply solenoid valve side, and the bathtub and the vacuum breaker. is set at a certain distance.

A fourth means is to provide a first check valve, a second check valve, and a vacuum breaker in series between the hot water supply solenoid valve and the three-way valve in order from the hot water supply solenoid valve side, and to connect the bathtub and the vacuum breaker. , are set at a certain distance.

Function As mentioned above, hot water can be conveyed using water pressure, and hot water can also be supplied while being reheated by the hot water supply and bath heat exchangers during conveyance. In addition, in the case of reheating, a three-way valve can be switched to stir the inside of the bathtub.

In addition, two check valves and a vacuum breaker were installed in series between the magnetic valve and the three-way valve for the hot water supply, and a certain distance was provided between the bathtub and the vacuum breaker, so that the water in the bathtub This prevents water from flowing back to the water supply side.

Example Examples thereof will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a bathtub with a water heater, which has a built-in hot water supply heat exchanger 2 and a bath reheating heat exchanger 28, and is used for supplying hot water to the kitchen and shower, and for refilling the bath. First, I will explain the water supply side. When water is led to a bath pot 1 with a water heater by a water supply pipe 3 connected to a water pipe, it passes through a water flow sensor 4, a water flow proportional valve 5, and is supplied to a heat exchanger 2 for hot water supply. The hot water that has passed through the hot water supply heat exchanger 2 passes through the hot water supply pipes A and 6, and then is led to the hot water supply pipes B and 8 that are connected to the automatic hot water supply solenoid valve 7 and the hot water tap 9 that is installed in the kitchen, etc. It branches into the hot water supply pipe C1O at a branch part 11.

There is an automatic hot water supply solenoid valve 7 at the end of the hot water supply pipe B.
After passing through the check valve 12, it is led through a vacuum breaker 13, a second check valve, and a three-way valve 15. The three-way valve 15 has a ball valve (not shown) inside thereof, and the ball valve is rotated by a motor 16. The three-way valve 15 can open and close valves A-17, B-18, and C-19 by rotating the ball valve.

Now, when trying to supply hot water to the bathtub 20, open valve A-17 and valve C-18 of the three-way valve 15, and open valve B-1.
9 is closed, hot water is guided to the bathtub 20 via the bath adapter 22 via the bath pipe 24 via the flow switch 27 and the bath heat exchanger 28.

When hot water is supplied to the bathtub 20 in this state, the water level of the bathtub water 23 in the bathtub 21 rises, and when the water level of the bathtub water 23 rises to the bath return pipe 21 of the bath adapter 22, the water level sensor 25 indicates that the pressure increases. begins to be detected. This water level is indicated by 23a. When the water level rises from the water level 23a to a predetermined water level 23b, the three-way valve 15 is rotated to close valves A and 17, and valves B and 19 and valve C are closed.
- When the pump 26 is operated after opening the bath 18, the flow switch 27 is turned on, and the bath going pipe 24 and the bath returning pipe 21 are filled with hot water through the bath heat exchanger 28. If the flow switch 27 is continuously turned on for a predetermined period of time, it is verified that the bath inlet pipe 21 and the bath return pipe 24 are completely filled with water. At this time, the bath thermistor 29 provided in the bath return pipe 21
Detects the bathtub water temperature, and if the bathtub water temperature is lower than the set water temperature set with a bath remote control (not shown), etc., the bath heat exchanger is used to catch up to the set water temperature in 2 days. You can also do it. This is also to prevent the output of the water level sensor 25 from changing depending on the temperature of the water, since the water level sensor 25 usually has temperature characteristics.

When the hot water is reheated to the set temperature, the three-way valve 15 is rotated, valve B-19 is closed, and valves A, 17, and C are closed.
18, and then open the automatic hot water supply solenoid valve 7.
Hot water is led from the bath pipe 24 to the bathtub 20. When hot water is supplied to the water level 23c, which is several orders of magnitude lower than the water level 23d set by the adjustment knob on the bath remote control (not shown), the three-way valve 15 is rotated again, valves A and 17 are closed, and valve B- 19 and valve C-18 are opened. At this point, the magnetic valve 7 for automatic hot water supply is closed and the pump 26 is turned on. A bath going pipe 21 and a bath return pipe 24 are circulated for a predetermined time, and when the water temperature is lower than a set temperature, the bath heat exchanger is used to cool down the water until it reaches the set temperature in two days. Here, when the set water temperature is reached, the three-way valve 15 is rotated again, and the valve B/19 is turned.
, close valve A-17 and valve C-18, open automatic hot water supply solenoid valve 7, and set water level 23d.
Hot water is supplied until When the water level reaches the set level, rotate the 3-way valve I5 again, close valves A and 17, open valves B and 19 and C-18, close the automatic hot water supply valve 7, and open the bath pipe. 24 and a bath return pipe 21, and when the bath water temperature is lower than the set water temperature, the bath heat exchanger 28 is used to vary the water temperature to the set water temperature.

Of course, if the output change due to the temperature of the water level sensor 25 is small, the bath refilling at the water level 23b may be omitted, or even the circulation mode and bath refilling at the water level 23c may be omitted. good.

Now, the upper end 30 of the bath M20 and the vacuum breaker, 1
For example, a distance of 30 cm or more should be ensured from the distance flit with 3. This is because negative pressure is generated in the water supply pipe 3 due to a water outage, for example, and automatic hot water supply 1! If the magnetic valve 7 or the 3-way valve 15 fails and communicates with the bathtub water 23, if the vacuum breaker 13 and the first and second check valves 12 and 14 were not present, the water supply pipe 3 would be contaminated. The water in the bathtub will flow backwards, which is very dangerous from a sanitary standpoint. vacuum breaker,
13 and the first and second check valves 12 and 14 are designed to break the negative pressure and suck in the atmosphere, and generally an atmospheric pressure type or pressure type vacuum breaker is used. 31 is a suction port for sucking the atmosphere of the vacuum breaker.

Normally, when hot water is flowing through the vacuum breaker 13, the suction port 31 of both the atmospheric pressure type and the pressure type is blocked. Furthermore, the automatic hot water supply solenoid valve 7 is closed, valve A/17 of the three-way valve 15 and valve C/18 are open, and valve B/19 is opened.
is closed, in the case of an atmospheric pressure type, the first check valve I2
There is an air layer between the check valve 12 and the second check valve 14, and in the case of a pressure type, the space between the first check valve 12 and the twentieth check valve 14 is filled with water.

Furthermore, as in the first embodiment shown in FIG.
When the three-way valve 15 and the three-way valve 15 are installed in series, the three-way valve 15
Even if the seal becomes insufficient, the second check valve 14 stops the dirty water in the bathtub water 23, making it sanitary, and moreover, the dirty water does not go beyond the second check valve to the water supply side.

Further, as in the embodiment shown in FIG. 2, after installing the vacuum breaker 13 after the automatic hot water supply solenoid valve 7, the first check valve 12, the second check valve 14, and the three-way valve 15 are installed. If provided, it is possible to prevent the dirty water from the bathtub from going upstream from the second check valve 14, so that the distance that the dirty water returns to the piping can be made as short as possible, as in the embodiment shown in FIG. Long, there is a place.

Further, as in the embodiment shown in FIG. 3, when the first check valve 12, the second check valve 14, the vacuum breaker 13, and the three-way valve 15 are connected after the automatic hot water supply solenoid valve 7. In the worst case, the dirty water in the bathtub water 23 rises to the upstream side compared to the embodiments shown in FIGS. 1 and 2, and the second check valve 14 can prevent backflow. Note that the embodiment shown in FIG. 1, the embodiment shown in FIG. 2,
In the embodiment shown in FIG. 3, a case has been described in which both the first check valve 12 and the second check valve 14 are provided.
Needless to say, if either the first check valve 12 or the second check valve 14 is provided, backflow of sewage can be prevented. If 26 is installed downstream of the flow switch 27, for example, between the 3-way valve C/18 of 5 and the bath heat exchanger 28, the circulation pump pressure will be added to the water pressure, making transportation possible even in areas with low water pressure. Capacity does not decrease (the same effect can be obtained even if a circulation pump is placed upstream of the flow switch 27).
Of course, in the case of FIG. 4, water automatically enters the circulation pump 26 when hot water is automatically supplied to the bathtub 20. There is also the advantage that there is no need to inject water into () and ().

Effects of the Invention As mentioned above, water pressure is used to convey hot water, and when reheating, etc., the three-way valve is switched to stir the inside of the bathtub, so the following effects can be achieved. You can expect it.

(a) Hot water can be transported using water pressure, and hot water reheated by a bath heat exchanger can be transported, so hot water can be automatically supplied in a short time even when the water temperature drops, such as in winter.

(b) Furthermore, since the WIN pump is used not for transporting hot water but for stirring hot water, it can be made smaller and lower in cost, and troubles caused by vibrations of the NM pump can be eliminated.

(c) The bath heat exchanger can be made into an instantaneous water heater type, so
Unlike traditional bath pots, it does not get dirty with hot water stains.

(=) Complicated tank water level control unlike the conventional tank part is unnecessary, and reliability is improved.

(*) During automatic hot water supply, when the hot water tap is opened and the flow rate of the bath pipe decreases, the flow switch is turned OFF, so automatic hot water supply is put on hold and priority is given to showering using the hot water tap. You can also do it. After the shower is finished, you can cancel the automatic hot water supply standby and return to automatic hot water supply. This reduces the output of the water level sensor when the water level rises or falls, making it possible to prevent erroneous determination that the water level has not risen.

(f) If the I-ring pump is placed between the three-way valve and the bath heat exchanger, priming of the circulation pump becomes unnecessary. Furthermore, since the circulation pump pressure is added to the water pressure, the conveyance capacity does not decrease even in areas with low water pressure.

Furthermore, since there is a certain distance between the bathtub and the vacuum breaker, and the bathtub has first and second check valves, the following effects can be expected.

(a) Even if the three-way valve leaks, the second check valve can prevent the leak.

(El) Also, even if there is a leak in the three-way valve and negative pressure is generated in the water supply pipe, the second check valve stops the backflow, making it sanitary.

(8) Furthermore, if an atmospheric pressure type vacuum breaker is used, an air layer will be formed between the first check valve and the second reverse valve, which will separate the valve from the bathtub water.

(d) Furthermore, since the first and second check valves are provided in succession, even if the second check valve leaks, the first check valve can prevent leakage and backflow. Note that if the first and second check valves are built into a three-way valve, the component structure can be made compact.

Moreover, if the first and second check valves for hot water supply are built into the outlet side of the magnetic valve, this can also be made into a compact component structure.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the first embodiment of the bathtub with water heater of the present invention, Fig. 2 is a block diagram of main parts showing the second embodiment of the present invention, and Fig. 3 is a block diagram showing the third embodiment of the present invention. FIG. 4 is a block diagram showing a fourth embodiment of the present invention, and FIG. 5 is a block diagram of a conventional example. 2... Heat exchanger for hot water supply, 3... Water supply pipe, 7... Hot water supply solenoid valve, 9... Hot water tap,
12...First check valve, 13...Vacuum breaker, 14...Second check valve, 15.
...3-way valve, 20...bathtub, 21...
...Bath return pipe, 24...Bath out pipe, 25
...Water level sensor, 26...Circulation pump. Name of agent Patent attorney Shigetaka Awano 1 person -1- -m- -m- -m- +3 ・14 ・- 15-m- n-... 2! - 25-・A- Heat supply furnace Pipe I 8 notes and pipe water 11 sensor 1s ring pump -m- 3・7 ・− 7・− 12... +5 ・・− υ−−− 2! - SW electric cable in charge of the furnace 12 Yuba Zetsu 2k? i4￥ '71 Check valve j causes unevenness and it's the first 21f! Stop # 3 way # tank bath return pipe! 1j L8 Shuei 7R standing ℃ n the - #, younger sister's body position 㙸゛r》禰-Suri 1 Suri body--++, c-槓 t'nido sosa vs. semi

Claims (4)

[Claims] (1) Branch from the outlet side of the hot water heat exchanger connected to the water supply pipe, connect a hot water tap to one of the branched hot water pipes, and connect a 3-way valve to the other hot water pipe via a solenoid valve for hot water supply. And this 3
Each outlet of the three-way valve is connected to a bathtub pipe connected to the bathtub via a bath heat exchanger, and a return pipe connected to the bathtub and via a water level sensor and a circulation pump in the middle, and the three-way valve is a bathtub with a water heater that connects the other hot water pipe to the bath pipe when hot water is supplied. (2) A first check valve, a vacuum breaker, and a second check valve are installed in series in this order from the hot water supply solenoid valve side between the hot water supply solenoid valve and the three-way valve, and at a certain distance from the bathtub. A bathtub with a water heater according to claim (1). (3) Between the hot water supply solenoid valve and the three-way valve, a vacuum breaker, a first check valve, and a second check valve are installed in order from the hot water supply solenoid valve side.
2. The bathtub with water heater according to claim 1, wherein a check valve is provided in series, and a certain distance is provided between the bathtub and the vacuum breaker. (4) A first check valve, a second check valve, and a vacuum breaker are provided in series between the hot water supply solenoid valve and the three-way valve in order from the hot water supply solenoid valve side, and the bathtub and vacuum breaker are The bathtub with water heater according to claim (1), wherein the bathtub is provided at a certain distance.