JPH02115657A - Automatic hot water supply bath boiler - Google Patents

Abstract

PURPOSE:To prevent water from freezing and to improve operability by discharging remaining water in a hopper when an automatic operation switch is opened, and circulating the hot water in a bathtub to a circulation passage to purge the air in the passage. CONSTITUTION:A three-way valve 8 is switched to a hopper 5 side, and a pump 9 is operated to discharge remaining water in the hopper 5 to a circulation passage 7. When the facts that the float switches 51 of the hopper 5 are all OFF and the water is completely discharged are detected, the valve 8 is switched to the passage 7 side to circulate the hot water in a bathtub 6 for a predetermined period of time thereby to discharge the air sucked into the passage 7 into the bathtub 6. Even if an automatic operation switch 25 is opened to be stopped, the hot water does not remain in the hopper 5, and the passage 7 is set to the state that the water level of the bathtub 7 can be detected by a pressure sensor 12 by purging the air by the circulation of the hot water. Accordingly, when the switch 25 is closed, the water level can be initially detected, and the water level is not wastefully raised even if the hot water is already stored at the set water level or more in the bathtub 6.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an automatic hot water bath device.

(Prior Art) Conventionally, as shown in Japanese Unexamined Patent Publication No. 63-21439, a pressure sensor is installed in the reheating circulation path to detect the water level in the bathtub, and the hopper and circulation path are connected from the water heater to the hot water heater. A bathtub in which hot water is poured into a bathtub through a bathtub is known.

With this conventional system, if the circulation path is not filled with hot water, the pressure sensor cannot accurately detect the water pressure based on the bathtub water level, so when the automatic operation switch is turned on, a certain amount of hot water is always in the circulation path. The system supplies air to purge the circulation path.

(Problem to be solved by the invention) However, with this conventional bathtub, when the automatic operation switch is turned on with hot water already accumulated above the set water level in the bathtub, the amount of hot water supplied for air purge However, the water level in the bathtub rises unnecessarily, making it inconvenient to use and sometimes causing overflow from the bathtub.

In addition, if the automatic operation switch is turned off during this air purge or while hot water is being poured into the bathtub, the hot water supply will stop, but at the same time, the communication between the hopper and the circulation path will be cut off, so hot water will not flow into the hopper. Since the hopper is built into the main body, which is installed outdoors at a remote location from the bathtub, there is a problem in that the remaining water in the hopper freezes in the winter.

The present invention solves these conventional problems, and even if the automatic operation switch is turned off during automatic hot water supply, hot water will not remain in the hopper, and the water level in the bathtub will rise the next time the automatic operation switch is turned on. The purpose of the present invention is to provide an automatic hot water bath device that can detect the water level from the beginning without any trouble.

(Means for solving the four problems) In order to achieve the above object, the automatic hot water supply bath apparatus of the present invention has the following configuration. In other words, when the automatic operation switch is turned on, hot water is dropped from the water heater into the bathtub via the hopper and the reheating circulation path, and a pressure sensor installed in the circulation path detects the water level in the bathtub, and the set water level is detected. Then, the system automatically stops the dropping and reheats to the set temperature, and when the automatic operation switch is turned off, the remaining water in the hopper is drained and hot water from the bathtub is circulated through the circulation path to purge the circulation path with air. That's what I do.

(Function) When the automatic operation switch is turned off, if hot water is being poured from the water heater into the bathtub, it will stop pouring water into the bathtub, and if the pump is stopped, the pump will be operated to drain the remaining water in the hopper into the circulation path. to be discharged. When the remaining water in the hopper is discharged, communication between the hopper and the circulation path is cut off, and the pump continues to operate for a certain period of time to circulate hot water from the bathtub through the circulation path.

In other words, in order to completely drain the remaining water in the hopper, it is unavoidable to draw some air from the hopper into the circulation path, but then by circulating hot water through the circulation path, this air can be sucked into the bathtub. The water can be drained, the circulation path is filled with hot water, and the pressure sensor is in a state where it can detect the water pressure based on the water level in the bathtub.

Therefore, even when the automatic operation switch is off, the bathtub water level can be detected, and the next time the automatic operation switch is turned on, the water level can be detected from the beginning.

(Example) An example will be described with reference to the drawings. In Figure 1, the automatic hot water bath device main body (1) has a built-in water heater (2) and a bath pot (3), and branches into a hot water pipe (20) that connects the water heater (2) to a hot water faucet (4). Bath hot water supply pipe (21)
The bath water supply pipe (21) is connected to a homper (
5), the hopper (5) is the bath V% device (3)
It is connected to a circulation path (7) formed between the bathtub and the bathtub (6) via an electric three-way valve (8).

(9) is a pump, (10) is a water flow detection means such as a water flow switch or a flow rate sensor, (11) is a hot water temperature detection means such as a thermistor, and (12) is a pressure sensor.

(13) is a bypass path that branches from the discharge side of the pump (9) and connects to the piping (7A) where the pressure sensor (12) is installed, and a bypass solenoid valve (14) is interposed therein. . (22) is a water flow sensor provided in the bath hot water supply pipe (21), (23) is an electric water flow control valve, and (24) is a solenoid valve for bath water supply.

The water flow control valve (23) controls the flow rate according to the state of a float switch (51) provided in the hopper (5). (15) is a control means for controlling various functions of the automatic hot water supply bath device, and (16) is a 'M control means (1).
5) is a remote control that is connected with a signal line. Remote controller(
16) is the operation switch (26), automatic operation switch (
25), water level setting switch (18), hot water temperature setting switch (19), etc.

Turn on the operation switch (26) and turn on the automatic operation switch (
25), the water level detected by the pressure sensor (12) is read and the remote control (16) is turned on, as shown in Figure 2.
) compared with the set water level set with the water level setting switch (18). If the water level is below the set water level, the Ti solenoid valve 24) is opened, the pump (9) is operated, the bypass solenoid valve (14) is opened, and hot water supplied from the water heater (2) is routed through the circulation path (7).
The circulation path (7) is filled with hot water and air purged. When a certain amount of hot water is flowing, the bypass Ti magnetic valve (14) is closed, and while the water level is detected by the pressure sensor (12) through the pipe (7A), the hot water supplied from the water heater (2) is passed through the other pipe. Place the pressure sensor (
12) detects the set water level, it closes the solenoid valve (24) to stop dropping, and at the same time closes the three-way valve (8) to the hopper (
Switch to the circulation path (7) (!4) from the 5) side. On the other hand, if the pressure sensor (12) detects the water level above the set level from the beginning, neither air purge nor dropping is performed.

Then, when the three-way valve (8) is switched, the hot water in the bathtub (6) is circulated through the circulation path (7), and when the water flow detection means (10) detects the circulating water flow, reheating is started, and the hot water temperature detection means (11) ) detects the set temperature set with the hot water temperature setting switch (19), it stops reheating and shifts to heat retention/water replenishment mode.

In the heat retention/water replenishment mode, the water level detected by the pressure sensor (12) is read at fixed intervals (for example, 30 minutes), and if the water level is lower than the set water level, hot water is dropped from the water heater (2) into the bath M (6). At the same time, the pump (9) is operated and the hot water temperature detection means (11) detects the hot water temperature of the bath N (6), and if the temperature is lower than the set temperature, reheating is performed.

After such heat retention and water replenishment operations are performed for a certain period of time (for example, 4 hours) predetermined by the heat retention timer, the automatic operation switch (25) is automatically turned off. However, it is also conceivable that the user turns off the automatic operation switch (25) or the operation switch (26) before that.

Note that when the operation switch (26) is turned off, the automatic operation switch (25) is also turned off.

Figure 3 shows what happens when the automatic operation switch (25) is turned off. This is a liIIga flowchart, and first the three-way valve (
8) is not communicating with the hopper (5) side, switch to the hopper (5) side and operate the pump (9) to connect the hopper (
5) The remaining water inside is discharged to the circulation path (7). When it is detected that all the float switches (51) of the hopper (5) are turned off and the water is completely discharged, the three-way valve (8) is switched to the circulation path (7) side and 4f of bath water is added to the circulation path (7). (6)
The hot water is circulated for a certain period of time, and the air sucked into the circulation path (7) when draining the remaining water in the hopper (5) is transferred to the bathtub (
6).

Therefore, even if the automatic operation switch (25) is turned off and automatic operation is stopped midway, hot water will not remain in the hopper (5), and the hopper (5)
After draining the remaining water inside, the circulation path (7) is air-purged by circulating hot water, and the pressure sensor (12) detects the temperature of the bath Jl! Since the water level in the bathtub (6) can be detected, the next time the automatic operation switch (25) is turned on, the water level can be detected first, and the water level in the bathtub (6) can already be detected, as shown in Figure 2. )
This prevents the water level from rising unnecessarily when the water level is higher than the set water level.

In addition, as a special case, when the piping of the circulation path (7) between the bathtub (6) and the main body (1) of the device is raised to a higher position than the bathtub (6) (so-called Torii piping). In this case, even if the hot water in the bath M (6) is drained, hot water remains in the piping from the rising part to the main body (1) of the device, and the pressure sensor (12) detects a water level higher than the set water level. However, if you do not detect a circulating water flow of hot water from bath M (6) in the circulation path (7) before firing, return to the air purge sequence. A is determined to be normal and prevents safe operation.

(Effects of the Invention) The automatic hot water bath device of the present invention has the following excellent effects. That is, even if the automatic operation switch is turned off during automatic hot water supply, hot water will not remain in the hopper, and the risk of freezing can be prevented. Moreover, since the pressure sensor stops operation when it is in a state where it can detect the water level in the bathtub, the next time the automatic operation switch is turned on, the water level in the bathtub can be detected without raising the water level unnecessarily, making it easy to use. will improve.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a control flowchart for automatic operation in the same example, and FIG. 3 is a control flowchart accompanying turning off the automatic operation switch in the same example. (2)... Water heater (5)... Hopper (6)... Bathtub (7)... Circulation path (12)... Pressure sensor

Claims (1)

[Claims] When the automatic operation switch is turned on, hot water is poured from the water heater into the bathtub via the hopper and reheating circulation path.
A pressure sensor installed in the circulation path detects the water level in the bathtub, and when the set water level is detected, the dropping process is automatically stopped and the heating reaches the set temperature.When the automatic operation switch is turned off, the remaining water in the hopper is An automatic hot water bath device characterized by discharging water and circulating hot water from a bathtub through a circulation path to air purge the circulation path.