JPH0289955A - bath equipment - Google Patents

Abstract

PURPOSE:To prevent the rottenness caused by residual water and the breakage due to freezing and attempt an improvement in hygiene and safety by detecting that the hot water in a tank has been discharged by the signal from a water level detector installed in the tank and controlling so as to make a three-way valve to be switched for the first time from the side of the tank to the side of circulation passage. CONSTITUTION:When the automatic hot water supplying operation is switched to the additional burning operation by the partial operation of a controller 25, the controller 25 which receives this signal closes an automatic hot water supplying valve 10 and the supply of hot water into a tank 12 stops. But hot water is still left in the tank 12 and the three-way valve 13 remains connected to the tank 12, and a pump 14 transports the hot water in the tank 12 to a bath tub 22 continuously until the lower switch 23a of a water level detector 23 outputs the signal of OFF. When the water in the tank 12 is totally discharged and the switch 23a outputs the signal of OFF, the controller which receives this changes over the three-way valve 13 from between the tank 12 and pump 14 to between a return pipe 21 and the pump 14. Accordingly, the additional burning operation is started. There is, therefore, no inconvenience that hot water remains in the tank 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bath device having an automatic hot water supply function for automatically supplying hot water to a bathtub.

2. Description of the Related Art Conventionally, this type of bath equipment has a structure as shown in FIG. That is, when the hot water tap 1 is opened during hot water supply operation, water flows in from the water supply connection port 2 and is detected by the water supply detector 3. In response to this signal, the gas solenoid valve 4 and gas control valve 5 open to start hot water supply. Ignite burner 6. The hot water heated by the hot water supply heat exchanger 7 is supplied from the hot water faucet 1 via a hot water supply passage 8 and a hot water supply connection port 9.

Next, during automatic hot water supply operation, the automatic hot water supply opening/closing valve 1O is "opened" according to the instruction, and the water flowing in from the water supply connection port 2 is
The hot water is heated by the hot water supply heat exchanger 7 in the same way as during the hot water supply operation. The heated hot water is supplied into a tank 12 from an automatic hot water supply channel 11 through an automatic hot water supply on/off valve 10.

Here, the three-way valve 13 is switched to the tank 12 side, and the pump 14 is operated, passing through the water flow detector 15, reheating heat exchanger 16, outgoing pipe 17, and bathtub adapter 18 to the bathtub 19.
Hot water is supplied inside. The water level in the tank is controlled by a pole tap 20 to be maintained at a constant level.

Next, during the continuous operation, the three-way valve 13 is switched to the circulation path P side for the continuous connection, that is, from the tank 12 to the return pipe 21 side, and the pump 14 is operated, so that the hot water 22 in the bathtub 19 is transferred to the bathtub adapter 18. , a return pipe 21, a three-way valve 13, a water flow detector 15, a pump 14, and then heated in a reheating heat exchanger 16, an outgoing pipe I7, and a bathtub adapter 18.
The water is further circulated into the bathtub 19.

Problems to be Solved by the Invention However, in the above configuration, when automatic hot water supply operation is performed, a certain level of hot water exists in the tank 12, and when switching to continuous operation, the three-way valve 13 Since the water is switched to the return pipe 21 side, the automatic hot water supply conduit 18 is closed by the three-way valve 13, and hot water remains in the tank 12. For this reason, if you do not use the bath for a long time,
This poses a problem in that the remaining water rots and the tank 12 is damaged due to freezing.

In view of the above-mentioned problems, the present invention controls so that when the three-way valve switches to the circulation path side, the hot water in the tank is discharged and switches, thereby preventing rotting and freezing damage due to residual water, and improving hygiene and safety. The aim is to improve

Means for Solving the Problems Therefore, the technical means of the present invention for solving the above-mentioned problems consists of a hot water supply heat exchanger, and a hot water supply system that is branched from the outlet of the hot water supply heat exchanger and one of which is supplied to the hot water supply piping. The automatic hot water supply channel includes a water supply channel and an automatic hot water supply channel that supplies hot water to the bathtub. A pump is provided to transport hot water into the bathtub via a circulation path connected to the tank and circulate hot water in the bathtub via the circulation path, and a three-way valve to switch the flow of hot water between the tank side and the circulation path side. There is a water level detector inside the tank to detect the height of the water surface, and means is provided for controlling the three-way valve so that no hot water remains in the tank by switching the three-way valve based on the signal from the water level detector.

action The effect of this technical means is as follows.

In other words, when switching from automatic hot water supply operation to continuous operation,
Only after a water level detector installed in the tank detects that the hot water in the tank has been discharged will the three-way valve be controlled to switch from the tank side to the circulation path side. As a result, there is always no hot water left in the tank.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. Note that the same parts as in the conventional example are given the same reference numerals, detailed explanations are omitted, and different parts will be mainly explained. In FIG. 1, 23 is a water level detector that detects the height of the water surface in the tank 12, and a switch 23 that detects the presence or absence of hot water.
The amount of hot water automatically supplied into the tank 12 is controlled by a water amount control valve 24 based on signals from a and 23b.

That is, when the "low" switch 23a is turned OFF, the water flow control valve 24 increases the flow rate, and the "r high" switch 23b is turned OFF.
When N is applied, the flow rate is reduced to maintain a constant water level between the switches 23a and 123b. A controller 25 issues a signal to switch the three-way valve 13 from the tank 12 side to the circulation NP side, that is, the return pipe 21 side, in response to the OFF signal of the "low" switch 23a of the water level detector 23.

Next, the operation of the configuration of this embodiment will be explained. 1st
In the figure, during automatic hot water supply operation, the automatic hot water supply amount is set to tank 1.
The water flow rate control valve 24 is controlled by signals from switches 23a and 23b of the water level detector 23 in the water level detector 2.

The hot water supplied in the tank 12 is transferred to the tank 12 by the three-way valve 13.
and the pump 14, and by operating the pump 14, the three-way valve 13, the water flow detector 15, and the pump 14 are operated.
, the hot water passes through the reheating heat exchanger 16 and the outgoing pipe 17 to the bathtub 19.
Hot water is supplied inside.

Here, when the automatic hot water supply operation is switched to the continuous operation by a partial operation of the controller 25, the controller 25 that receives this signal closes the automatic hot water supply on/off valve IO, and the hot water supply to the tank 12 side is stopped. do. However, since hot water still remains on the tank 12 side, the three-way valve 13 remains connected to the tank 12, and the pump 14 continues to transport the hot water in the tank 12 to the bathtub 22. The operation continues until the "low" switch 23a of the water level detector 23 issues an OFF signal.

Then, all the hot water in the tank 12 is discharged and the switch 23
When the switch a issues an OFF signal, the controller 25 receives this and closes the three-way valve 13 from between the tank 12 and the pump 14 to the return pipe 2.
1 and pump 14. Therefore, a continuous operation will be started. As a result, when switching from automatic hot water supply operation to continuous operation as in the conventional case, the automatic hot water supply conduit 11 is closed by the three-way valve 13 and hot water remains in the tank 12, which does not occur.

Effects of the Invention As described above, the present invention has 1. The signal from the water level detector installed inside the tank controls the three-way valve to switch from the tank side to the circulation path side only after it detects that the hot water in the tank has been discharged. This has the effect of preventing freezing damage and improving hygiene and safety.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a bath device according to an embodiment of the present invention,
FIG. 2 is a block diagram of a conventional bath device. 7... Heat exchanger for hot water supply, 10... Automatic hot water supply opening/closing valve, 12... Tank, 13...
・Three-way valve 13.14...Pump, 16...
・・Heat exchanger for reheating, I7・・・・Outgoing pipe, 2I・
... Return pipe, 23 ... Water level detector, 25
...controller. Name of agent: Patent attorney Shigetaka Awano and 1 other person 7-・ + (I 13 ... 16 ・・- g! −・ Otsu −・ P9 for Kumitaka Gakushu 1 close-close valve tack three-way valve pump retroactive IOa Figure 2

Claims (1)

[Claims] The automatic hot water supply system comprises a hot water supply heat exchanger, a hot water supply conduit branching from the outlet of the hot water supply heat exchanger, one of which is supplied to the hot water supply piping, and the other is an automatic hot water supply conduit which is supplied to the bathtub. The water passage includes a tank for separating the bathtub from the bathtub, and carries the hot water in the tank to the bathtub via a circulation path connecting the bathtub and the reheating heat exchanger. A pump for circulating hot water through the circulation path and a three-way valve for switching the flow of hot water between the tank side and the circulation path side are provided, and a water level detector for detecting the height of the water surface is provided in the tank; This bath equipment is equipped with means for controlling a three-way valve from the tank side to the circulation path side in response to a signal from a water level detector indicating that there is no water remaining in the tank so that no hot water remains in the tank.