JPH0514110Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is applicable to general hot water supply such as showers and kitchens, and heating and heating of bath water by jetting high-temperature water directly into the bathtub (reheating). The present invention relates to a hot water supply device for a bath that is configured to selectively supply hot water at a high temperature such as when the bath is heated.

(Prior Art) A conventional device of this type is disclosed in Japanese Utility Model Application Publication No. 59-118925. In this system, the hot water supply path is branched into a high temperature hot water supply path and a general hot water supply path, a water flow switch is installed in the general hot water path, and a solenoid valve is installed in the high temperature hot water path, which closes when the switch detects water flow.

Also, as a device for the same purpose,
There is one disclosed in Publication No. 58-123246. This configuration is for reheating using steam, and the outlet side of the heat exchanger is branched into a hot water supply path and a steam supply path, the hot water supply path is connected to the shower, and the steam supply path opens into the bathtub. has been done. Furthermore, a bypass waterway for mixing water is connected to the hot water supply path.

The steam supply path is equipped with a valve that slowly closes when a water flow switch attached to the hot water supply path detects water flow.

Furthermore, other devices for the above-mentioned purposes include a three-way valve installed at the branch point of the high-temperature hot water supply path and the general hot water supply path;
Some three-way valves incorporate a safety mechanism that prevents switching from the high-temperature water supply path to the general hot water supply path until the water temperature decreases due to an increase in water volume.

(Problem to be solved by the invention) However, in the case of the first configuration, as the water flow switch closes the solenoid valve as soon as it detects water flow, the high temperature water remaining in the piping may be discharged, which is dangerous. It was hot.

On the other hand, in the second configuration, the valve that stops the injection of steam into the bathtub closes slowly, so there is no risk that the steam remaining in the pipe will directly blow out from the shower or the like.

However, in the second configuration, the valve closes slowly, so a large amount of low-temperature hot water flows into the bathtub. The second configuration, i.e., 1987-
The configuration specifically disclosed in Publication No. 123246 is for injecting steam into a bathtub, so the effect is relatively small, but if this configuration is applied to a configuration for injecting high-temperature hot water into a bathtub, there will be a big problem. . That is, since hot water has a much smaller amount of heat than steam, there is a drawback that the temperature of the hot water in the bathtub decreases due to the low temperature hot water injected while the valve is slowly closing.

Moreover, since hot water configurations have a much higher gravimetric flow rate than steam-based configurations, the low-temperature hot water injected while the valve slowly closes reduces the amount of hot water in the bathtub. Sometimes it overflows.

Therefore, the second configuration can be said to be a configuration that can be adopted only when steam is used.

Further, in the case of the last configuration, it takes time to lower the temperature, and there is an inconvenience that general hot water cannot be immediately supplied.Furthermore, the safety mechanism complicates the structure and increases costs.

This invention solves all of the above problems, and when performing general hot water supply during high-temperature hot water supply, it prevents high-temperature water from being discharged, quickly and reliably brings the temperature to the set temperature, and also allows hot water in the bathtub to reach the set temperature quickly and reliably. To provide a bath water heater that does not lower the temperature or overflow.

(Means for Solving the Problems) In order to achieve the above object, the bath water supply device of the present invention has the following configuration. In other words, it has a heat exchanger, a burner, and a gas proportional valve that controls the combustion amount of the burner, and the hot water outlet path from the heat exchanger, which is equipped with a hot water temperature detector, is branched into a bath hot water supply path and a general hot water supply path. The hot water supply path is joined by a bypass path that bypasses the heat exchanger and is equipped with a hot water supply detection means, and a solenoid valve is installed after the branch point of the bath hot water supply path with the general hot water supply path. Sometimes, the hot water output target temperature of the heat exchanger is temporarily switched to a low constant temperature based on a signal from the hot water supply detection means to reduce the combustion amount of the burner, and the hot water output temperature detector detects when the hot water output temperature of the heat exchanger has fallen below a predetermined temperature. Then, after the target temperature switching means changes the hot water output target temperature to the set temperature and the hot water supply target temperature is switched by the target temperature switching means according to the signal from the hot water supply detection means, the hot water output temperature of the heat exchanger becomes lower than the predetermined temperature. The present invention is characterized in that it is provided with means for interrupting bath water supply, which closes the electromagnetic valve when a hot water outlet temperature detector detects this.

(Function) In the bath hot water supply device of the present invention, when a shower faucet or the like is opened during high-temperature hot water supply, only a portion of the high-temperature hot water that previously flowed to the bathtub side is diverted to the general hot water supply path.

Then, on the general hot water supply path side, water from the bypass path is mixed and diluted with the diverted high-temperature water, and the hot water is discharged at a safe temperature that will not cause burns. When the hot water supply detecting means detects this hot water, the target temperature switching means switches the target temperature of hot water to a constant low temperature, thereby reducing the combustion amount of the burner. Therefore, the temperature of the hot water discharged from the heat exchanger begins to drop rapidly.

Then, the hot water temperature detector detects that the temperature of the hot water discharged from the heat exchanger has dropped to a certain predetermined temperature, and it is confirmed that there is no risk of burns etc. even if the hot water is discharged as it is. , the bath hot water supply interrupting means closes the solenoid valve of the bath hot water supply path.

It should be noted here that the time to close the solenoid valve mentioned above is when the temperature of the hot water discharged from the heat exchanger has fallen to a predetermined temperature, and the solenoid valve is shut off when the hot water discharged from the heat exchanger is closed. Rather than waiting until the temperature of the hot water reaches the target hot water temperature.

When the solenoid valve is closed, the high-temperature hot water discharged from the heat exchanger that previously flowed toward the bathtub will now flow to the general hot water supply path, causing the temperature of the hot water discharged from the shower to rise somewhat. . However, the temperature of this water has already dropped to a safe level, so no major problems will occur.

Conversely, when the solenoid valve is closed, the amount of hot water dispensed from the shower or the like increases, allowing the user to use an abundant amount of hot water.

Moreover, since hot water whose temperature has become low is prevented from flowing into the bathtub, there is no risk of reheating the bathtub and causing the hot water in the bathtub to cool down.

In addition, when the hot water temperature detector detects that the temperature of the hot water discharged from the heat exchanger has decreased to a certain predetermined temperature, the target temperature switching means closes the solenoid valve mentioned above. The target hot water temperature is changed to the set temperature.

Therefore, the user of the bath water heater can obtain hot water at a desired temperature.

(Example) Specific examples of the present invention will be further described below.

In the figure, 1 is a main body of a water heater, which has a heat exchanger 2 and a burner 3 inside. A water flow sensor 5 and an inlet thermistor 6 are arranged in the inlet channel 4 to the heat exchanger 2, and a hot water outlet thermistor 8 and a water flow control valve 9 are arranged in the outlet channel 7. The hot water outlet path 7 is branched, one being a bath hot water supply path 13 connected to the lower part of the side wall of the bathtub 12 via a solenoid valve 10 and a vacuum breaker 11, and the other being a general hot water supply path 14. The general hot water supply path 14 is provided with a check valve 15 and a water switch 26 as a hot water detection means downstream from the branch point, and downstream of the check valve 15, the heat exchanger 2 is bypassed from the inlet water path 4 and the normally open state is set. A bypass path 17 in which a bypass solenoid valve 16 is arranged is merged.

Note that the hot water supply detection means may be a switch that operates in conjunction with opening and closing of the hot water tap.

The hot water supply path 13 for the bath is connected to the bathtub 12 by a bath adapter 18, and the bath adapter 18 includes a water level switch H19 for detecting a set water level as a water level detector for detecting the water level of the bathtub, and a water level switch H19 that is slightly higher than the bath adapter 18. A water level switch L20 that detects the reference water level of the bathtub and a water temperature detector 21 that detects the temperature of the water in the bathtub are provided. Incidentally, the water level detector is not limited to a water level switch, but may be constructed from a pressure sensor or the like.

Reference numeral 22 denotes a remote control, which is provided with a bath switch 23, which is a single switch for supplying bath water, and a general hot water temperature setting switch 24. 25 is a gas proportional valve that controls the combustion amount of the burner 3.

Reference numeral 27 denotes a controller for controlling each load, which includes a target temperature switching means 28 that lowers the hot water output target temperature of the heat exchanger 2 to a low constant temperature according to a signal from the hot water supply detection means 26 during hot water supply, and a hot water output thermistor (hot water output temperature detector). ) A built-in bath hot water supply interrupting means 29 closes the electromagnetic valve 10 in response to a hot water temperature signal from 8.

Next, an explanation will be given of the operation when the bath water supply device having the above configuration performs general hot water supply during high temperature hot water supply. First, when you turn on the bath switch 23, S1,
S2 in which the bath water supply sequence is started. When hot water is being supplied at a high temperature (e.g., 80°C) during the bath hot water supply sequence, when general hot water supply is started using a shower or the like, a water flow is generated in the general hot water supply path 14, and the water switch (hot water supply detector) 26 is turned on. S3. At this time, the high-temperature water from the heat exchanger 2 is mixed and diluted with the cold water from the bypass path 17, and the hot water is discharged. water switch 26
When turned ON, the target temperature switching means 28 first changes the hot water output target temperature of the heat exchanger 2 to a low constant temperature T1 (for example, 36
℃), and simultaneously open the water flow control valve 9 while reducing the heating amount. Due to the decrease in the amount of heating and the increase in the amount of water, the hot water temperature rapidly decreases and reaches a predetermined temperature (for example, 50℃).
When the hot water thermistor 8 detects that the hot water has become below ℃), the bath hot water supply interrupting means 29 switches the bath hot water supply path 1 to step S5.
S6 to close the solenoid valve 10 of No. 3 and stop bath hot water supply
At the same time, check that water switch 26 is ON and turn on S.
7. S8 to close the bypass solenoid valve 16. Then, the hot water flowing into the general hot water supply path 14 is only from the heat exchanger 2, so the target hot water output temperature of the heat exchanger 2 is set to the set temperature T _S set by the hot water temperature setting switch 24 of the remote controller 22 at step S9. After that, the hot water temperature is fed back to maintain the hot water at the set temperature.

That is, in this embodiment, when the temperature of the hot water discharged from the heat exchanger reaches the above-mentioned predetermined temperature, the bathtub solenoid valve is closed and the solenoid valve of the bypass path is also closed. Therefore, after closing both solenoid valves,
Since only the hot water flowing through the heat exchanger is discharged from the general hot water supply path, the temperature of the hot water discharged from the general hot water supply path can be directly controlled by changing the hot water supply target temperature to the desired set temperature.

(Effects of the invention) As described above, in the bath water heater of the invention, when general hot water is supplied while hot water is being supplied to the bathtub, a relatively small amount of water is diverted from the branch point to the general hot water supply side. Water flowing through the bypass path is mixed into the high-temperature hot water.

Therefore, the temperature of the hot water discharged from the heat exchanger is significantly lowered. Therefore, the bath water heater of the present invention can dispense hot water whose temperature has been sufficiently lowered from the moment the tap of a shower or the like is opened, and is easy to use and highly safe.

In addition, the present invention is designed to change the hot water supply temperature to a low constant temperature T1 of, for example, 36°C from a state in which the hot water is controlled to be dispensed at a high temperature of, for example, 80°C for reheating the bath. Due to this switching, the temperature of the hot water discharged from the heat exchanger drops rapidly.

Instead of waiting until the temperature of hot water discharged from the heat exchanger reaches a constant temperature T1, the temperature control is switched when a predetermined temperature higher than that is detected. Therefore, in the present invention, the temperature of the hot water discharged from the heat exchanger decreases extremely quickly, and it is possible to shift to temperature control exclusively for general hot water supply at an early stage.

In addition, in the bath water heater of the present invention, after the hot water temperature detector detects a predetermined temperature, the solenoid valve of the bath water supply path is closed, preventing low-temperature hot water from flowing into the bathtub indefinitely. Because it is done,
The hot water in the bathtub has been reheated to raise its temperature.
This has the effect that there is no risk of water cooling due to contamination with hot water from the general hot water supply.

In addition, the bath water heater of the present invention does not cause the bathtub to overflow with hot water.

[Brief explanation of drawings]

FIG. 1 shows an overall circuit diagram of an embodiment of the present invention, and FIG. 2 shows a flow diagram showing the flow of operation.
FIG. 3 shows a control block diagram. 2...Heat exchanger, 7...Hot water outlet path, 8...Outlet hot water temperature detector, 13...Bath hot water supply path, 14...General hot water supply path, 16...Solenoid valve, 17...Bypass path, 2
6... Hot water supply detection means, 28... Target temperature switching means, 29... Bath hot water supply interrupting means.

Claims (1)

[Scope of utility model registration request] The hot water outlet path from the heat exchanger, which has a heat exchanger, a burner, and a gas proportional valve that controls the amount of combustion of the burner, and is equipped with a hot water temperature detector, is branched into a bath hot water supply path and a general hot water supply path. A bypass path that detours around the heat exchanger joins the path, and a hot water supply detection means is installed, and a solenoid valve is installed after the branch point of the bath water supply path and the general hot water supply path. Based on the signal from the hot water supply detection means, the target hot water temperature of the heat exchanger is temporarily switched to a low constant temperature to reduce the combustion amount of the burner, and when the hot water temperature detector detects that the hot water temperature of the heat exchanger has fallen below the predetermined temperature. After the target temperature switching means changes the hot water output target temperature to the set temperature and the hot water supply target temperature is switched by the target temperature switching means according to a signal from the hot water supply detection means, the hot water output temperature of the heat exchanger becomes lower than the predetermined temperature. A hot water supply device for a bath, characterized in that it is provided with bath water supply interrupting means for closing the electromagnetic valve when a hot water outlet temperature detector detects this.