JPH045958Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an automatic bath device that pours hot water into a bathtub to a set water level and automatically stops the bath.

(Prior Art and Problems) In this type of conventional automatic bath system, the water level in the bathtub was detected by installing a water level detector in the bathtub as shown in Utility Model Application No. 169937/1983.

However, with such conventional systems, if the automatic bath system is installed at a remote location from the bathtub, construction work is required to connect the signal line of the water level detector, and there is a risk of disconnection of the signal line or electrical leakage. Repairs were also troublesome.

Therefore, the applicant of the present application previously proposed in Japanese Patent Application No. 168937/1983 a device in which a pressure sensor is provided within the main body of the device so that the water level in a bathtub at a remote location can be detected. However, since one of the circulation paths consisting of the outgoing pipe and the return pipe is used for dropping and conveying, and the other is used for pressure detection, it is necessary to air purge the inside of the pressure detection piping, and the conveyance path is used for pressure detection. Air purging was performed by switching to piping to transport hot water. When the solenoid valve opens and closes during this switching, hot water pressurized by the pump is suddenly switched on and off, creating water hammer, and the impact pressure is applied to the pressure sensor, which adversely affects the durability of the sensor. There was a problem that reduced the feeding accuracy. At the same time, the hot water inside the pipe tends to flow out into the bathtub due to inertia, causing a momentary negative pressure in the pipe and causing air to be sucked out of the bathtub, causing a problem in which air purge is not achieved and can cause false detection.

The purpose of the present invention is to solve the above-mentioned problems, reduce water hammer, reduce its influence on the sensor, and prevent air displacement to eliminate false detection.

(Embodiment) FIG. 1 shows an embodiment of the present invention, in which 1 is the main body of an automatic bathing device. 2 is a water heater, and 3 is a bath heater, which are provided in the main body 1.

4 is a bathtub located at a remote location from the main body 1. 5
is a bath hot water supply pipe branched from the hot water outlet pipe 7 of the water heater 3, and is provided with a valve 6. Reference numerals 8 and 9 designate reheating circulation paths, which consist of an outgoing pipe 8 that connects from the pump 10 to the bathtub 4 via the bath heater 3, and a return pipe 9 that returns from the bathtub 4 to the pump 10. Reference numeral 11 denotes a pressure sensor, which is installed in the return pipe 9 in the main body 1 and detects the pressure based on the water level in the bathtub 4. 12 is a three-way valve connected to the suction side of the pump 10, one of which is connected to the return pipe 9 and the other to the hopper 13. The hopper 13 is opened to the atmosphere to cut off the hot water from the bath water supply pipe 5. 16
is a three-way valve provided on the discharge side of the pump 10, and a short-circuit path 14 is provided to connect the outgoing pipe 8 and the return pipe 9 via the three-way valve 16. The short-circuit path 14 is provided with a solenoid valve 15, and further provided with a detour 17 that detours around the solenoid valve 15. Reference numeral 18 denotes a pressure opening/closing valve provided in the bypass path 17, which opens the valve when a predetermined pressure is applied.

The operation of this embodiment having the above configuration will be explained. When automatic hot water supply is commanded, the valve 6 is first opened to supply hot water to the hopper 13, and the three-way valve 12 is opened to the hopper 13.
switch to the side. Then, the solenoid valve 15 is opened, the three-way valve 16 is switched to the short-circuit path 14 side, and the pump 10 is operated to flow hot water into the return pipe 9 to purge the inside of the pipe with air. After air purging for a predetermined time, the solenoid valve 15 is closed, the three-way valve 16 is switched to the outgoing pipe 8 side, and hot water is conveyed from the outgoing pipe 8 to the bathtub 4, during which water pressure applied to the pressure sensor 11 via the return pipe 9 is detected. It is.

In addition, the piping conditions from the main body 1 to the bathtub 4 and the main body 1
Depending on the positional relationship between the bathtub 4 and the bathtub 4, air may enter the return pipe 9 before the water level in the bathtub 4 reaches the bath adapter 19. All you have to do is air purge the inside of 9. Then, the pressure sensor 11 sets the set water level (L).
If the water pressure corresponding to the water pressure is detected, the valve 6 is closed and the automatic hot water supply to the bathtub 4 is ended.

By the way, when air purges the inside of the return pipe 9 and switches the circuit to the outgoing pipe 8 side, when the solenoid valve 15 is closed, the hot water tends to flow in the bathtub 4 direction due to inertia, and the solenoid valve 1
The downstream side of 5 momentarily becomes negative pressure. Next, the hot water is pulled back by this negative pressure and becomes a positive pressure, and this pressure fluctuation acts as a water hammer and impacts the pressure sensor 11, and in some cases, when the hot water is pulled back, air is sucked from the bathtub 4. However, in the present invention, this problem can be solved by providing a detour 17 that detours around the electromagnetic valve 15 and providing a pressure opening/closing valve 18 in the detour 17. That is, when switching the circuit from the return pipe 9 side to the outgoing pipe 8 side, the solenoid valve 15 is closed and the three-way valve 16 is switched. It takes several seconds, and the solenoid valve 15 is closed instantly, so the closing pressure of the pump 10 is applied to the upstream side of the closed solenoid valve 15 via the three-way valve 16. Further, as described above, negative pressure is generated downstream of the electromagnetic valve 15 due to the inertia of the hot water. These are applied to the pressure on-off valve 18 via the bypass path 17, and the pressure on-off valve 18 is opened. Therefore, hoppa 1
3, the hot water flows through the three-way valve 12, the pump 10, the three-way valve 16, and the detour 17 to the downstream side of the solenoid valve 15, and the negative pressure is eliminated. Thereafter, the pressure on/off valve 18 closes as the pressure on the upstream side decreases.

(Effects of the invention) The invention has the following excellent effects. In other words, it is possible to reduce the water hammer that occurs when switching the conveyance path after air purge, reducing the impact on the pressure sensor, contributing to improving the durability of the pressure sensor, and preventing air displacement in the pipe to ensure accurate water pressure. It enables detection.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing an embodiment of the present invention. 1... Body, 4... Bathtub, 8... Outgoing pipe (reheating circulation path), 9... Return pipe (additional heating circulation path), 10... Pump, 11... Pressure sensor, 12, 16... Three-way valve, 14... Short circuit, 15... Solenoid valve, 17...
Detour, 18...pressure on/off valve.

Claims (1)

[Scope of utility model registration request] A water heater and a bath heater are installed in the main body located remote from the bathtub, and the additional pipe consists of an outgoing pipe that connects from the discharge side of the pump to the bathtub via the bath heater, and a return pipe that connects from the bathtub to the suction side of the pump. A bath hot water supply pipe that forms a heating circulation path and connects to a three-way valve interposed in the return pipe from the water heater, and hot water is supplied from the water heater to the bathtub via the additional heating circulation path,
A three-way valve is provided on the way of the outgoing pipe, and the three-way valve is connected to the bathtub side from the three-way valve of the return pipe to form a short-circuit path that short-circuits the outgoing pipe and the return pipe, and from the short-circuit path to the bathtub via the return pipe. An automatic bath device characterized in that a solenoid valve and a pressure sensor are provided in a path leading to the bath, a detour is provided to bypass the solenoid valve, and a pressure opening/closing valve is provided in the detour.