JPH0354271B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bathing device with a water heater, in which an instantaneous water heater and a bath water circulating heater are installed in parallel.

(Prior Art) The present applicant proposed in Japanese Patent Application No. 59-143627 a bath device equipped with a water heater in which hot water heated by a conventional water heater is dropped into a bathtub through a heating circulation path of the bath. To explain this with a drawing, instantaneous water heater 2
The heated hot water is sent from the bath water supply pipe 20 to the pump 16.
The bathtub 19 is passed through the bathwater heating circulation path 15 having
It's starting to fall into place. However, during the drop-in hot water supply, hot water is supplied to the bathtub 19 through the circulation heat exchanger 12, so heat is radiated from the hot water while passing through the circulation heat exchanger 12, and water flow resistance is large, limiting the amount of water flow. Therefore, there were problems of wasted fuel and long drop-in time.

(Embodiment) The present invention solves such difficulties, and the embodiment thereof will be described below with reference to the drawings. 1 is a bathtub with a water heater, and inside is an instantaneous water heater 2 and a bath water circulation heater. 3 are placed side by side. The instant water heater 2 consists of a heat exchanger for hot water supply 4, a burner 5 for heating this, an inlet pipe 6 connected to the city water supply, a hot water outlet pipe 7, etc. The inlet pipe 6 is equipped with a water flow switch 8, and the hot water outlet pipe 7 is equipped with a water flow switch 8. A hot water temperature detection thermistor 10 is arranged respectively. On the other hand, the bath water circulation heater 3 includes a circulation heat exchanger 12,
burner 13, bath water going pipe 14, bath water return pipe 15,
A self-priming pump 16 disposed on the return pipe 15, a flow rate switch 17 disposed upstream thereof, a circulating water temperature detection thermistor 18, etc. are provided. The outgoing pipe 14 and the return pipe 15 are combined into one double tube, and their ends are opened in the side wall of the bathtub 19 in the bathroom. 20 is a bath hot water supply pipe connecting the hot water outlet pipe 7 and the pump inlet side of the return pipe 15, and from the hot water outlet pipe 7 side, there is a flow rate sensor 21, a solenoid valve 22 for bath hot water supply, and a standby valve for preventing sewage backflow. It has a funnel-shaped hopper 23. 26 is a gas solenoid valve provided in the gas path to the burner 13. Although the bathtub 1 with a water heater having such a configuration is installed on the first floor, the bathtub 1
9 may be provided on the second floor as shown by the chain line in the figure. 2
Reference numeral 8 denotes a remote control provided near the bathtub 19, which includes a power switch 29, a water temperature adjustment knob 30 for hot water supply, a bath reheating switch 31, a bath automatic switch 32, a bath temperature setting knob 33, a hot water amount setting knob 34, and the like. 35 is the bath hot water supply pipe 20 of the return pipe 15
The solenoid valve 36 provided on the upstream side of the connection with the pump 16 is a bypass pipe that connects the return pipe 15 on the outlet side of the pump 16 and the outgoing pipe 14 on the outlet side of the circulation heat exchanger 12. A solenoid valve 37 is provided. 38 is a solenoid valve provided between the hopper 23 and the return pipe 15. These four solenoid valves 22, 3
Nos. 5, 37, and 38 operate so that only the solenoid valve 35 is opened and closed in the opposite state to the others.

In the above configuration, to automatically boil a bath, turn on the power switch 29 using the remote control 28, set the desired temperature and water amount using the bath temperature setting knob 33 and water amount setting knob 34, and then press the automatic switch 32. Good. As a result, the solenoid valve 22 opens and water flows, and upon detection by the water flow switch 8, the water heater 2 operates, the burner 5 ignites, and hot water at a preset appropriate temperature (for example, about 38°C) is supplied from the bath water supply pipe 20. flows. At this time, the flow sensor 21 starts measuring the flow rate, and after the hot water is dropped into the hopper 23, it is passed through the return pipe 15, the bypass pipe 36, and the outgoing pipe 14 by the pumping force of the pump 16 that is being driven. It is sent out to the bathtub 19. That is, the hot water during operation is sent to the bathtub 19 without passing through the circulation heat exchanger 12, which has a large water flow resistance. Then, it gradually accumulates in the bathtub 19. When the flow rate sensor 21 measures the value set in advance with the setting knob 34, the solenoid valve 22 closes and the water heater 2 stops operating, while the solenoid valves 37 and 38 close and the solenoid valve 35 opens, opening the circulation path. Communication is formed. Then, the pump 16 rotates and a forced flow is generated in the circulation path, and when the flow rate switch 17 detects this, the burner 13 is ignited and the circulating water is boiled until the thermistor 18 detects the preset water temperature, and then stops. be.

When the bath water has cooled down and it is necessary to reheat it, turn on the reheat switch 31, the heat exchanger 12 will heat the water while it is being forced to circulate through the pump 16, and the temperature will be increased by detecting the set temperature of the thermistor 18. stops.

To supply hot water to a kitchen or the like, it is only necessary to open the hot water supply switch where the hot water is to be used, the water flow switch 8 starts water flowing out, and then hot water is supplied, which is the same as in the case of bath hot water supply.

In this way, in the present invention, when hot water is poured into the bathtub 19, the bypass pipe 36 is opened and the hot water is supplied without passing through the circulation heat exchanger 12, so piping resistance loss can be minimized and a large flow rate can be pumped. In addition to shortening the pouring time, sufficient hot water can be supplied even with a pump with a weak pumping force, and in addition, heat radiation loss during hot water pouring can be reduced as much as possible. In addition, even if the city water supply side is cut off and the pressure becomes negative, the waste water (bath water) will be
3, it is completely separated from the city water, so there is no chance of sewage flowing back into the city water and making it sewage. Furthermore, since the hot water stored in the hopper 23 is pumped by the pump 16, even in the case of a second-floor bathtub, the hopper 23 is installed inside the bathtub, so there is no inconvenience; all that is required is construction of the circulation path of the pipe between the bathtub 19 and the equipment. It also has excellent construction properties.

The drawings also include other embodiments of the present invention, including a return pipe 15 and an outgoing pipe 14 on the upstream side of the solenoid valve 35.
A bypass pipe 39 is provided which bypasses the solenoid valve 37.
In this case, return pipe 1
Since hot water is also supplied from No. 5, it is possible to pump a larger flow rate and dramatically improve the pouring time.

(Effects of the Invention) In short, the present invention branches a bath hot water supply pipe from the hot water outlet pipe of an instantaneous water heater whose inlet pipe communicates with the city water supply, and the bath water supply pipe is provided with a solenoid valve that is opened when hot water is supplied to the bath. The bath water supply pipe is connected to the inlet side of the pump for circulating bath water of the circulation circuit that connects the bathtub and the circulation heat exchanger of the bath water circulation heater, and also connected to the circulation circuit on the outlet side of this pump. Since the circulation circuit on the exit side of the heat exchanger is connected by a bypass pipe with a bypass solenoid valve that is opened when hot water is supplied to the bath, hot water can be poured into the bathtub in a short time with a sufficient flow rate. In addition, it is possible to provide an excellent bathing device with a water heater that has little heat radiation loss and does not waste fuel.

[Brief explanation of drawings]

The drawings are schematic configuration diagrams showing embodiments of the present invention. 2... Instant water heater, 3... Bath water circulation heater,
12... Circulating heat exchanger, 16... Pump, 19
... Bathtub, 20 ... Bath water supply pipe, 36 ... Bypass pipe, 37 ... Bypass solenoid valve.

Claims (1)

[Claims] 1. A bath hot water supply pipe is branched from the hot water outlet pipe of an instant water heater whose inlet pipe communicates with the city water supply, and the bath water supply pipe is equipped with a solenoid valve that is opened when hot water is supplied to the bath, so that the bath water supply pipe is connected to the bathtub. It is connected to the inlet side of the pump for bath water circulation of the circulation circuit that connects the circulation heat exchanger of the bath water circulation heater, and the circulation circuit on the outlet side of this pump and the circulation circuit on the outlet side of the heat exchanger. A bath device with a water heater connected by a bypass pipe with a bypass solenoid valve that is opened when hot water is supplied to the bath.