JP3720114B2 - Bath water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bath water heater with a reheating function for general households.
[0002]
[Prior art]
Conventionally, in this type of bath water heater, an external water pipe connecting the water heater and the bathtub is used to send the water in the bathtub to the water heater, and to send the water heated in the water heater to the bathtub. It is comprised by. Then, the water in the bathtub is fed into the water heater via one external water pipe by the pump provided in the internal water pipe of the water heater, and is heated by the burner when passing through the heat exchanger, and passes through the other external water pipe Then it is sent out to the bathtub. Then, the water in the bathtub is continuously circulated between the bathtub and the water heater as described above until the temperature detected by the temperature sensor that detects the water temperature in the bathtub reaches the set temperature, and the water passing through the water heater is Reheating is done by heating.
[0003]
[Problems to be solved by the invention]
However, in the continuous circulation type bath water heater as described above, a pair of external water pipes are used to connect the water heater and the bathtub, so the total distance of the external water pipes is the installation distance from the bathtub of the water heater. Approximately double.
[0004]
By the way, the total distance of the external water pipe that can be used to connect the water heater and the bathtub depends on the ability of the pump to circulate the water channel formed by the external water pipe and the internal water pipe. Therefore, when the pump capacity is reduced due to the downsizing of the pump due to the layout design requirement inside the water heater, the total distance of the external water pipes that form the circulation channel is also limited. Therefore, in such a case, the disadvantage that the distance that can be installed from the bathtub of the water heater is limited is particularly large.
[0005]
In addition, the use of two external water pipes has the disadvantage that the construction cost of the pipes increases.
[0006]
The present invention provides a bath water heater that eliminates the above inconveniences, can increase the distance that can be installed from the hot water bath tub while reducing the size of the pump, and can reduce piping costs. Let it be an issue.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a bath water heater of the present invention includes one external water pipe that connects a water heater and a bathtub, and an internal water pipe that connects the external water pipe and a reserve tank provided inside the water heater. A pump that is provided in the internal water pipe, sends water from the bathtub to the reserve tank and sends water from the reserve tank to the bathtub, a heat exchanger provided in the internal water pipe, and a burner that heats the water passing through the heat exchanger, After the bath temperature sensor that detects the temperature of the water in the bathtub and the pump is operated to send the predetermined amount of water to the reserve tank, the heat exchanger is operated by operating the pump with the predetermined amount of water in the reserve tank. It is characterized by comprising a control device that repeats heating through a burner and sending it to a bathtub until the temperature detected by the bath temperature sensor reaches a set temperature.
[0008]
In this invention, a pump is operated and the water of a bathtub is sent to the reserve tank inside a water heater via an internal water pipe from one external water pipe. Then, after sending a predetermined amount of water from the bathtub to the reserve tank, the water stored in the reserve tank is pumped to the internal water pipe, and the water passing through the heat exchanger is heated with a burner. Send to the bathtub via an external water pipe. Then, after a predetermined amount of water is sent from the reserve tank to the bathtub, the temperature of the water in the bathtub is detected by the bath temperature sensor, and when the detected temperature reaches the set temperature, the chasing is finished. On the other hand, when the detected temperature does not reach the set temperature, the detected temperature is set to the operation of heating the predetermined amount of water in the reserve tank and sending it to the bathtub after the predetermined amount of water is sent to the reserve tank. Repeat until the temperature is reached.
[0009]
According to the present invention, there is one external water pipe, and the installation distance from the water heater of the bathtub is made substantially the same as the total distance of the external water pipe. Therefore, even if the pumping capacity is reduced, the distance at which the water heater can be installed can be increased as compared with the conventional two external water pipes. Moreover, since the number of external water pipes has been reduced from two to one, piping costs are reduced, and piping work is simplified.
[0010]
Next, in the bath water heater according to the present invention, the internal water pipe connects a pair of first water pipe and second water pipe connecting the external water pipe and the reserve tank, and a first water pipe and a second water pipe. It consists of three water pipes, and a water channel communicating the bathtub side of the first water pipe and the third water pipe, the reserve tank side of the first water pipe, and the third water pipe are connected to the connecting portion between the first water pipe and the third water pipe. A first three-way valve for switching between the water channel is provided, and a reserve for the water channel, the third water tube, and the second water tube that connects the third water tube and the bathtub side of the second water tube to the connecting portion of the second water tube and the third water tube. A second three-way valve for switching between a water channel communicating with the tank side is provided, a pump for feeding water from the first three-way valve side to the second three-way valve side is provided in the third water pipe, and a second three-way valve for the second water pipe It is preferable that the heat exchanger is further provided on the bathtub side. Then, the control device controls the first three-way valve and the second three-way valve to form a water passage from the bathtub side of the first water pipe to the reserve tank side of the second water pipe through the third water pipe, The operation to send a predetermined amount of water from the bathtub to the reserve tank, and the first three-way valve and the second three-way valve to control the first water pipe from the reserve tank side through the third water pipe to the second water pipe bathtub The temperature detected by the bath temperature sensor is the set temperature, which is the operation of forming a water channel to the side, operating the pump, heating the specified amount of water in the reserve tank through the heat exchanger with the burner and sending it to the bathtub Repeat until it reaches.
[0011]
According to the present invention, since a predetermined amount of water in the bathtub is sent to the reserve tank without passing through the heat exchanger, the time required for feeding the bathtub water to the reserve tank is shortened, and the time required for reheating is reduced. Can be shortened.
[0012]
Further, according to the present invention, one pump for discharging water from the first three-way valve side to the second three-way valve side is provided, and the water in the bathtub is reserved by switching between the first three-way valve and the second three-way valve. The operation for feeding the water into the bathtub and the operation for feeding the water in the reserve tank to the bathtub can be switched. Therefore, it is not necessary to provide pumps that perform the above two operations independently.
[0013]
Furthermore, in the bath water heater of the present invention, the water supply / drain port provided in the bathtub connected to the external water pipe separately separates the water inlet from the external water pipe to the bathtub and the water outlet from the bathtub to the external water pipe. The inlet is provided with an inlet valve that opens only in the direction in which water flows from the external water pipe to the bathtub, and the outlet is provided with an outlet valve that opens only in the direction in which water flows out from the bathtub to the external water pipe. It is preferable that a filter for filtering water flowing out from the outlet valve to the external water pipe is provided.
[0014]
According to the present invention, water fed from the water heater flows into the bathtub from the inlet / outlet of the water supply / drain through the external water pipe, while the water in the bathtub is filtered by the filter provided at the outlet of the water / drain outlet. Therefore, it is possible to prevent dust and the like in the bathtub from being sent into the water heater together with the water in the bathtub.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the bath water heater of the present invention will be described with reference to FIGS. FIG. 1 is a system configuration diagram of a bath water heater of the present embodiment, FIG. 2 is an enlarged view of the vicinity of a water supply / drain port of the present embodiment, and FIG. 3 is a flowchart for explaining the operation of the present embodiment.
[0016]
In FIG. 1, 1 is a water heater, 2 is a bathtub, 3 is an external water pipe connecting the water heater 1 and the bathtub 2, 4 is a reserve tank provided inside the water heater 1, and 5 is an external water pipe 3 and a reserve. A first water pipe that connects the tank 4, a second water pipe that connects the connecting portion between the external water pipe 3 and the first water pipe 5 and the reserve tank 4, and a 7 that connects the first water pipe 5 and the second water pipe 6. This is the third water pipe. 8 is provided at a connecting portion between the first water pipe 5 and the third water pipe 7, a water channel (C → A in FIG. 1) communicating the bathtub side of the first water pipe 5 and the third water pipe 7, and the first This is a first three-way valve that switches a water channel (B → A) that communicates the reserve tank side of the water pipe 5 with the third water pipe 7. 9 is provided at a connecting portion between the second water pipe 6 and the third water pipe 7, a water channel (A ′ → C ′) communicating the third water pipe 7 and the bathtub side of the second water pipe 6, and the third water pipe 7. And a water channel (A ′ → B ′) that connects the second water pipe 6 to the reserve tank side. A pump 10 is provided in the third water pipe 7 and sends out water from the first three-way valve 8 side to the second three-way valve 9 side. 11 is a heat exchanger provided on the bathtub side from the second three-way valve 9 of the second water pipe 6, and 12 is a burner for heating water passing through the heat exchanger 11.
[0017]
A water flow switch 13 is provided between the pump 10 of the third water pipe 7 and the second three-way valve 9 to detect the flow of water. 14 is a reserve tank water level sensor for detecting the water level of the reserve tank 4, 14 a is a high water level electrode that conducts when the water in the reserve tank 4 reaches a predetermined high water level X, and 14 b is the water in the reserve tank 4 at a predetermined low level. This is a low water level electrode that conducts when the water level reaches Y. A thermistor 15 is provided on the bathtub side of the first three-way valve 8 of the first water pipe 5 and detects the temperature of the water in the bathtub 2 fed into the first water pipe 5 inside the water heater 1 through the external water pipe 3. This is a bath temperature sensor. Reference numeral 16 denotes a reheating switch for turning on / off the reheating function of the water heater 1, and 17 denotes a temperature setting means for setting a desired reheating temperature. Reference numeral 18 denotes a control device for a reheating function, which will be described in detail later. Signals are input from the reserve tank water level sensor 14, water flow switch 13, bath temperature sensor 15, reheating switch 16, and temperature setting means 17 to the control device 18, and control is performed. Each control signal is output from the device 18 to the first three-way valve 8, the second three-way valve 9, the pump 10, and the burner 12.
[0018]
A bath water level sensor 19 detects a predetermined water level in order to prevent the water level of the bathtub 2 from rising and overflowing water. 20 is a check valve provided on the reserve tank 4 side of the first three-way valve 8 of the first water pipe 5 and prevents a reverse flow of water from the first three-way valve 8 side to the reserve tank 4 side, and 21 is a first water pipe. A water pipe for hot water to the bathtub 2 connected to 5 and a check valve 22 for preventing a back flow from the first water pipe 5 side to the water pipe water pipe 21 side.
[0019]
In FIG. 2, reference numeral 23 denotes a water supply / drainage port connected to the external water pipe 3 and provided in the bathtub 2, 24 denotes an inlet of water from the external water pipe 5 to the bathtub 2, and 25 denotes an inlet 24. An inlet valve that opens only in the direction in which water flows in, 26 is an outlet to the external water pipe 3 of the water in the bathtub 2, 27 is provided in the outlet 26, and opens only in a direction in which the water in the bathtub 2 flows out to the external water pipe 3 The outlet valve 28 is a filter for filtering water flowing out from the outlet 27 to the external water pipe 3.
[0020]
In this embodiment, the water fed from the water heater 1 to the bathtub 2 via the external water pipe 3 pushes the inlet valve 25 from the inlet 24 of the water supply / drain port 23 and flows into the bathtub 2. On the other hand, the water sent back from the bathtub 2 to the water heater 1 via the external water pipe 3 pushes the outlet valve 27 from the outlet 26 of the water supply / drainage port 23 to flow out into the water supply / drainage port 23, and the water in the bathtub 2 After passing through the filter 28 and filtering dust and dirt in the bathtub 2, it flows out to the external water pipe 3. As a result, the water in the bathtub 2 is filtered of dust and dirt and sent back to the water heater 1.
[0021]
Next, the operation of reheating with the bath water heater of the present embodiment will be described.
[0022]
In FIG. 3, when starting reheating of the water heater 1, a desired reheating temperature is set by the temperature setting means 17, and the reheating switch 16 is turned on. The set temperature and the turn-on switch 16 signal are input to the control device 18.
[0023]
At this time, the control device 18 performs the operation shown by R → S in FIG. 3 until the water level of the reserve tank 4 reaches a predetermined high water level X and the high water level electrode 14a of the reserve tank water level sensor 14 is turned on. That is, the control device 18 first switches the first three-way valve 8 to a water channel (C → A) that connects the bathtub side of the first water pipe 5 and the third water pipe 7, and the second three-way valve 9 is changed to the third water pipe. 7 and the water channel (A ′ → B ′) that communicates with the reserve tank side of the second water pipe 6. Then, the pump 10 is operated to discharge from the first three-way valve 8 side to the second three-way valve 9 side, and the water in the bathtub 2 is discharged from the external water pipe 3 to the first water pipe 5, the first three-way valve 8, and the second three-way. It is sent to the reserve tank 4 via the valve 9 and the second water pipe 6.
[0024]
When the water level of the reserve tank 4 reaches the high water level X and the high water level electrode 14a becomes conductive, the control device 18 stops the pump 10 and connects the first three-way valve 8 to the reserve tank side of the first water pipe 5 and the first water pipe 5a. While switching to the water channel (B → A) that communicates with the three water pipes 7, the second three-way valve 9 is switched to the water channel (A ′ → C ′) that communicates the third water pipe 7 and the bathtub side of the second water pipe 6. Then, the pump 10 is operated to discharge from the first three-way valve 8 side to the second three-way valve 9 side, and the water in the reserve tank 4 is supplied to the first water pipe 5, the first three-way valve 8, the third water pipe 7, 2 Send out from the three-way valve 9 to the bathtub side of the second water pipe 6. At this time, when the water flow switch 13 detects the flow of water and the detection signal is input to the control device 18, the control device 18 ignites the burner 12 and starts reheating combustion. And the water which passes the heat exchanger 11 is heated with the burner 12, and it sends out to the bathtub 2 via the external water pipe 3. FIG.
[0025]
Next, when the water level of the reserve tank 4 drops to a predetermined low water level Y and the low water level electrode 14b of the reserve tank water level sensor 14 is turned on, the control device 18 extinguishes the burner 12 and stops the pump 10. Then, the first three-way valve 8 and the second three-way valve 9 are switched again, and the water channel (C → A) from the bathtub side of the first water pipe 5 to the reserve tank side of the second water pipe 6 via the third water pipe 7 → A ′ → B ′). Then, the pump 10 is operated to feed the water in the bathtub 2 into the reserve tank 4.
[0026]
Then, when the water level of the reserve tank 4 rises to the high water level X and the high water level electrode 14a becomes conductive, the reheating operation shown in P → Q in FIG. 3 is performed again. That is, the water in the reserve tank 4 is heated and sent to the bathtub 2 until the water level in the reserve tank 4 drops to the low water level Y and the low water level electrode 14b becomes conductive, and then the water level in the reserve tank 4 reaches the high water level X. The water in the bathtub 2 is sent back to the reserve tank 4 until it rises and the high water level electrode 14a becomes conductive.
[0027]
When the reserve tank 4 reaches the high water level X and the high water level electrode 14a is turned on, the control device 18 stops the pump 10, and detects the temperature detected by the bath temperature sensor 15 and the set temperature by the temperature setting means 17. To determine the temperature. When the detected temperature reaches the set temperature, the chasing is finished. On the other hand, if the detected temperature does not reach the set temperature, the P → Q reheating operation is performed again until the detected temperature reaches the set temperature, and then the detected temperature and temperature setting means 17 by the bath temperature sensor 15 are detected. Repeat the operation of comparing the set temperature by.
[0028]
In the present embodiment, after the P → Q chasing operation is performed twice, the comparison determination between the detected temperature by the bath temperature sensor 15 and the set temperature by the temperature setting means 17 is performed. Alternatively, the detected temperature and the set temperature may be compared and determined after the P → Q chasing operation is performed once.
[0029]
Further, in this embodiment, the internal water pipe is composed of the first water pipe 5, the second water pipe 6 and the third water pipe 7, and the first three-way valve 8 and the second three-way valve 9 are switched, whereby the bathtub 2 The operation of feeding water into the reserve tank 4 and the operation of feeding water into the bathtub 2 of the reserve tank 4 are performed. However, the present invention is not limited to this, and the internal water pipe is composed of a pair of water pipes that connect the external water pipe and the reserve tank, a pump for feeding the water of the bathtub to the reserve tank is provided in one water pipe, and the reserve in the other water pipe Another pump for sending the tank water to the bathtub water may be provided.
[0030]
In the present invention, the external water pipe and the reserve tank are connected by a single internal water pipe, and the water discharge direction is connected to the internal water pipe from the bathtub side to the reserve tank side and from the reserve tank side to the bathtub side. It may be provided with a pump that can be switched between these directions.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of a bath water heater according to an embodiment of the present invention.
FIG. 2 is an enlarged view of the vicinity of a water supply / drain port of the embodiment of FIG.
FIG. 3 is a flowchart for explaining the operation of the embodiment of FIG. 1;
[Explanation of symbols]
1 .... Hot water heater, 2 .... Bathtub, 3 .... External water pipe, 4 .... Reserve tank, 5 .... First water pipe, 6 .... Second water pipe, 7 .... Third water pipe, 8 .... Internal water pipe, 8 .. First three-way valve, 9 .. Second three-way valve, 10 .. Pump, 11 .. Heat exchanger, 12 .. Burner, 13 .. Water flow switch, 14 .. Reserve tank water level sensor, 14 a. High water level electrode, 14b ... Low water level electrode, 15 ... Bath temperature sensor, 16 ... Temperature setting means, 18 ... Control device, 23 ... Water supply / drain port, 24 ... Inlet, 25 ... Inlet valve, 26 ... · Outlet, 27 ·· Outlet valve, 28 ·· Filter

Claims (3)

One external water pipe connecting the water heater and the bathtub;
An internal water pipe connecting the external water pipe and a reserve tank provided in the water heater;
A pump that is provided in the internal water pipe and sends the water in the bathtub to the reserve tank and the water in the reserve tank to the bathtub;
A heat exchanger provided in the internal water pipe;
A burner for heating the water passing through the heat exchanger;
A bath temperature sensor that detects the temperature of the water in the bathtub;
After operating the pump to send a predetermined amount of water from the bathtub to the reserve tank, the predetermined amount of water in the reserve tank is heated by the burner via the heat exchanger via the heat exchanger, and sent to the bathtub. A bath water heater comprising a control device that repeats until the temperature detected by the bath temperature sensor reaches a set temperature. The internal water pipe is composed of a pair of first water pipe and second water pipe that connect the external water pipe and the reserve tank, and a third water pipe that connects the first water pipe and the second water pipe,
The first water pipe and the third water pipe are connected to the first water pipe by switching the water channel communicating the bathtub side of the first water pipe and the third water pipe, the reserve tank side of the first water pipe and the water channel communicating the third water pipe. A three-way valve is provided,
The second water pipe and the third water pipe are connected to the second water pipe by switching the water channel communicating the third water pipe with the bathtub side of the second water pipe and the water channel communicating the third water pipe with the reserve tank side of the second water pipe. A three-way valve is provided,
The third water pipe is provided with a pump for feeding water from the first three-way valve side to the second three-way valve side;
The heat exchanger is provided on the bathtub side from the second three-way valve of the second water pipe,
The control device controls the first three-way valve and the second three-way valve to form a water passage from the bathtub side of the first water pipe to the reserve tank side of the second water pipe through the third water pipe, and operates the pump. The operation of sending a predetermined amount of water in the bathtub to the reserve tank, and the first three-way valve and the second three-way valve are controlled to move from the reserve tank side of the first water pipe to the bathtub side of the second water pipe via the third water pipe The temperature detected by the bath temperature sensor reaches the set temperature when a water channel is formed, the pump is activated, and a predetermined amount of water in the reserve tank is heated by the burner via the heat exchanger and sent to the bathtub. The bath water heater according to claim 1, wherein The water supply / drain port provided in the bathtub connected to the external water pipe is separately provided with an inlet of water from the external water pipe to the bathtub and an outlet of water from the bathtub to the external water pipe. An inlet valve that opens only in the direction in which water flows into the bathtub is provided, and an outlet valve that opens only in the direction in which water flows out from the bathtub to the external water pipe is provided at the outlet, and water that flows out from the outlet valve to the external water pipe The bath water heater according to claim 1, wherein a filter for filtering the water is provided.

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