JPS61289261A - Hot-water supplying device for bath - Google Patents

Abstract

PURPOSE:To prevent a heat exchanger from becoming an abnormal high temperature and permit to realize a highly reliable device by a constitution wherein water is poured automatically until water level, capable of effecting additional heating, is achieved, thereafter, an additional heating means is ignited, in case the water level is decided by a water level deciding means that the additional heating can not be effected in that water level. CONSTITUTION:The water level detecting means 14 employs a pressure sensor 15 and operates the water level by measuring air pressures in an air trap 17 and a tube 16, which are varied in accordance with the water level in a bathtub 2. A water level signal (a), outputted from the water level detecting means 14, is compared with an additional heating control water level VMIN, outputted from an additional heating water level setting means 19, in a comparison means 20 to output a water level deciding signal (b). An additional heating cnontrol circuit 7 is provided with a function to operate the additional heating means 1 when the water level in the bathtub 2 is higher than the allowable level of additional heating and a hot-water pouring control circuit 9 is provided with a function to operate the hot-water pouring means 8 when the water level in the bathtub 2 is lower than the allowable water level of additional heating, whereby there may be no danger to blow boiled hot steam out of a water flowing pipe.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a bath water heater that prevents dry heating.

2. Description of the Related Art As shown in FIG. 4, a conventional bath water heater of this type is configured to open a faucet 23 and supply water into a bathtub 2 through at least an upper water pipe 3.
The system is constructed so that the bathtub 2 is filled with water until it reaches a certain amount or more, and then the bathtub 1 is operated to boil the bath.In the event that the bathtub 2 does not contain a predetermined amount of water, the reheating switch 21 is turned on and the burner 5 is turned on. When ignited, that is, during dry firing, K detects an excessive temperature rise in the heat exchanger 4 using a temperature switch 22, and stops the operation of the reheating means 1.

Problems to be Solved by the Invention However, with the above configuration, when the water level in the bathtub is between 3a and 3b of the upper and lower water pipes and the reheating switch 21 is turned on, the hot water will boil over. If steam blows out from the water pipe 3a, which is very dangerous, or if the water in the bathtub is not fully heated, if the reheating switch 21 is turned on, the temperature switch 22 will operate and stop reheating.
However, there was a problem in that the heat exchanger 4 was abnormally heated by the time the temperature switch 22 was activated, leading to deterioration.

Means for Solving the Problems In order to solve the above problems, the bath water heater of the present invention includes a water level detection means for detecting the water level in the bathtub, and a water level detected by the water level detection means at a level that allows reheating. 'I' for whether or not
It has a water level judgment means for automatically pouring hot water into the bathtub, a reheating means for reheating the bath, and a reheating switch for turning on and off the reheating. When the reheating switch is turned on, if the water level determination means determines that the water level has not reached a level that allows reheating, the hot water pouring means automatically pours water until the water level reaches a level that allows reheating. After that, the reheating means is ignited.

According to the above-described configuration, when the user turns on the reheating switch, the present invention uses the water level detection means, water level determination means, etc. to determine whether the water level in the bathtub is at a level that allows reheating. When the water level is lower than the level that allows reheating, K automatically pours in the insufficient amount using the pouring means, and after reaching the water level that allows reheating, automatically ignites the reheating means and starts reheating. do. It goes without saying that the reheating means is ignited as soon as the water level is higher than the level at which reheating is possible and the reheating switch is turned on.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a heating means, which is connected to a bathtub 2 through water pipes 3a and 3b. The reheating means 1 is a heat exchanger 4. Burner 5. Gas control valve6. It is composed of a reheating control circuit 7 and the like.

Reference numeral 8 denotes a pouring means, which includes a pouring control circuit 9, a pouring valve 10, a hopper 11, a heat exchanger 12, a burner 13, and the like.

14 water level detection means uses pressure sensor F-15,
The water level is calculated by measuring the air pressure in the air trap 17 and tube 16, which changes according to the water level in the bathtub 2. 018 is a water level determination means, and the water level output from the water level detection means 14 is calculated. The signal a and the reheating control water level (VMI) output from the reheating water level setting means 19
N) is compared by the comparison means 20, and a water level determination signal S is output.

21 is a reheating switch provided on a remote control or the like.

Note that the reheating control circuit 7 has a function of operating the reheating means 1 when the reheating switch 21 is on and the water level judgment signal is active, that is, when the water level in the bathtub 2 is higher than the water level that allows reheating. The hot water control circuit 9 has a function of operating the hot water pouring means 8 when the reheating switch 21 is on and the water level determination signal is inactive, that is, the water level in the bathtub 2 is below the reheating water level.

Figure 2 shows the magnitude of the output signal from the pressure sensor 15 with respect to the water level of the bathtub, and shows the magnitude of the output signal from the pressure sensor 15 with respect to the water level of the bathtub.
The reheatable water level corresponding to IN) K is set at a position where the water level in the bathtub 2 slightly exceeds the upper water pipe 3a.

Effects of the Invention As described above, the bath water supply device of the present invention provides the following effects.

Even if you turn on the reheating switch when the water level in the bathtub is not at the level of the water pipe above, the water is automatically poured until the water level reaches the appropriate level, and then the reheating means is ignited. (1) Conventional method It is safe because there is no danger of boiling hot steam blowing out of the water pipes.

(2) Also, since the heat exchanger will not reach abnormally high temperatures,
A highly reliable device can be realized without worrying about deterioration.

[Brief explanation of drawings]

FIG. 1 is a control block diagram of a bath water heater according to an embodiment of the present invention, FIG. 2 is a characteristic diagram of the same part, and FIG. 3 is a control block diagram of a conventional example. 1... Reheating means, 2... Bathtub, 8...
Pouring means, 14 - Water level detection means, 18... Water level determination means, 21... Additional firing switch. Name of agent: Patent attorney Toshio Nakao and one other person wJ
Figure 1

Claims (2)

[Claims] (1) Input the reheating switch for turning on and off reheating the bath, the water level detection means for detecting the water level in the bathtub, and the water level signal from the water level detection means to determine whether it is at a predetermined level. a water level determining means for pouring hot water into the bathtub when the reheating switch is on and the water level determining means determines that the water level is other than a predetermined level;
Similarly, the bath water heater is provided with a reheating means for reheating the bath when the reheating switch is on and the water level is determined to be above a predetermined level by the water level determining means. (2) A claim that automatically starts pouring hot water when the water level in the bathtub is below a predetermined level and the reheating switch is turned on, and automatically starts reheating after the water level reaches a predetermined level. The bath water supply device according to item 1.