JPH04283349A - Hot water supplying apparatus for bath - Google Patents

Abstract

PURPOSE:To shorten a hot water filling time and to improve economy of an operation by automating hot water filling in response to the state of residual hot water by providing comparing and deciding means at the time of automatically filling hot water when hot water remains, and effectively selecting an addition of hot water and additional combustion heating operation. CONSTITUTION:Comparing and deciding means 29 which receives detection signals of residual hot water temperature (t) and residual hot water level (h) of a bathtub 6 from a bathtub temperature detector 22, a water level detector 28 and reading means 28, and a signal of a set temperature T set by a temperature setter 4, compares a predetermined water level X calculated by (A-t)Xh/(A- T) in the case of adding hot water to the bathtub 6 by a hot water supply circuit 1 at a highest supply hot water temperature A with a set water level H set by a water level setter 5, and decides a hot water filling operation. Then, a hot water addition controller 30 and an additional combustion controller 31 instruct an addition of hot water and an additional combustion to the circuit 1 and an additional combustion circuit 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the automation of a water heater that reheats hot water remaining in a bathtub.

0002

2. Description of the Related Art Conventionally, in this type of bath water heater, when there is residual hot water in a bathtub 6, as shown in FIG. Hot water at the set temperature is poured into the bathtub 6. And bathtub 6
The reading means 28 detects the output of the water level sensor 27 installed in the return pipe 7 of the bathtub 6, and the water level in the bathtub 6 is automatically filled up to the set water level set by the water level setting part 5 while determining the water level of the bathtub 6 by the comparison and judgment means 29. do. After that, the pump 20 provided in the bath reheating circuit 2 having the bath heater 23 is rotated,
The bath temperature detector 22 detected the temperature of the bath, and the bath heater 23 heated the bath until it reached the set temperature.

[0003]Although not shown in the drawings, in a bath water heater that is not equipped with a bath reheating circuit, when there is residual hot water in the bathtub, hot water is poured from the hot water heater to fill the bathtub with water at the set temperature and water level. was. In addition, 8 is an outgoing pipe, 19 is a three-way switching valve that switches and connects the outlet side of the hot water heater 12 to the return pipe 7, and is switched in the directions 6 and C.

0004

[Problems to be Solved by the Invention] However, in the reheating method of the configuration shown in FIG.
Even if hot water at the set temperature is poured up to the set water level when the remaining water temperature in the bathtub 6 is low, the water temperature in the bathtub 6 will become considerably lower than the set temperature due to mixing with the remaining hot water, and therefore, the hot water in the bathtub 6 will be reheated to the set temperature. There was a problem in that it took a long time to boil.

[0005] In the latter case where only hot water is poured, when the temperature of the remaining hot water is low, even if hot water is poured to the set water level, the water temperature in the bathtub does not reach the set temperature, making it impossible to take a bath and the hot water is not poured. The problem was that it was wasted.

SUMMARY OF THE INVENTION Therefore, the present invention provides a bath water supply device that automates the operation of using the remaining hot water in a bathtub and refills the bathtub with water so that bathing can be done in a short time even when the temperature of the remaining water is low.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the means of the bath water supply device of the present invention is to pour hot water into the remaining hot water at the maximum hot water supply temperature A so that the hot water temperature in the bathtub reaches the set temperature. A comparative determination means for calculating the required water level It is equipped with a hot water control circuit that gives instructions.

[0008]

[Function] With the above-mentioned means, the bath water supply device of the present invention, when pouring hot water into the bathtub from the previous day etc. to restore the bathing condition, maintains the maximum hot water supply temperature A, the residual water temperature t, and the residual water temperature t. Required water level X to raise the temperature of bathtub water at water level h to set temperature T
The comparison/determination means calculates the required water level X by the following formula:

[0009] When the required water level X is larger than the set water level H,
That is, even if the water level in the bathtub reaches the set water level H after hot water is poured at the maximum hot water supply temperature A, if the water temperature in the bathtub does not reach the set temperature and is lower than this, the reheating control circuit operates. The reheating control circuit first pours hot water at the maximum hot water supply temperature from the remaining water level H to the set water level H, and raises the water level in the bathtub to the set water level to meet the target set water level. Since the highest water supply temperature is selected as this hot water supply temperature, the temperature of the bathtub at the set water level is the highest temperature than when hot water is poured at other low water supply temperatures.

[0010] Then, from this high temperature, further cyclic heating is performed to perform reheating up to the target set temperature T, and since the amount of reheating heating is minimized, the time required for reheating is shortened. Generally, the circulation heating capacity is smaller than the hot water supply capacity, so the time required for pouring hot water from the residual hot water level H to the set water level H and then reheating it will be compressed as the hot water temperature is higher. It has an effect. In this way, when hot water is poured at the maximum hot water supply temperature A, the required water filling time can be effectively shortened.

[0011] Next, when the required water level . In order to shorten the time required for pouring hot water, it is desirable that the hot water supply control circuit increases the flow rate of hot water per unit time as much as possible. This hot water supply flow rate eliminates the need for circulating heating after pouring hot water, and allows the temperature of the hot water in the bathtub to reach the set temperature as soon as hot water is poured. The required hot water supply temperature Y that satisfies this shortening of the water filling time is calculated as follows: Y=(H×T−h×t)/(H−h).

[0012] In this way, when the temperature of the remaining hot water in the bathtub is low, the filling operation using pouring hot water and circulating heating is automatically selected based on the judgment of the comparison judgment means, and the required filling time is shortened. be able to. In addition, when the temperature of the remaining hot water is high, the water filling operation using only pouring hot water is automatically selected.
The required water refilling time is further shortened by the above operation.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the bath water supply device of the present invention will be described below with reference to the drawings. Figure 2 shows an embodiment of the present invention, in which 1 is a hot water supply circuit, 2 is a bath reheating circuit, and 3 is a bath remote control, which includes a set temperature T for the bath and a set water level H for the bath.
are set to desired values by the temperature setting section 4 and the water level setting section 5, respectively. The bathtub 6 is connected to the bath reheating circuit 2 through a return pipe 7 and an outgoing pipe 8, and the return pipe 7 receives hot water from the hot water supply circuit 1 at a confluence part 9. The controller 10 is electrically connected to the temperature setting section 4 and the like, and controls the operation of the device by transmitting and receiving signals.

The flow rate of water supplied to this device is detected by a water flow sensor 11 in a hot water supply circuit 1, heated by a hot water heater 12, and branched through a water flow control valve 14. One of the hot water is supplied to a hot water tap 15 in a kitchen or the like. be guided by. The other hot water passes through a hopper 18 via a hot water supply solenoid valve 16 and a check valve 17 to a confluence section 9.
be led to. The three-way valve 19 installed in the bath reheating circuit 2 switches so that points b and c in the figure are connected when automatically filling the bathtub 6 with hot water, and hot water is supplied via the pump 20, water flow switch 21, and bath temperature detector 22. , is guided to the bathtub 6 through an outgoing pipe 8 having a bath heater 23.

The temperature of hot water supplied to the bathtub 6 is detected by a hot water temperature detector 24. The burner 25 burns supplied water whose flow rate is adjusted by the water flow rate control valve 11 and fuel whose flow rate is adjusted by the fuel control valve 26 to heat the hot water heater 12 and control the hot water temperature. The water level sensor 27 outputs a water level detection signal of the bathtub 6 via the return pipe 7. Upon receiving this water level detection signal, the reading means 28 provided in the controller 10 detects the water level of the bathtub 6. Compare the bathtub water level and the set water level H. The controller 10 also includes a hot water supply control means 30 for controlling the filling of remaining hot water with water, a bath reheating control means 31, and the like.

The operation of this apparatus will be explained below based on the above configuration. First, the comparison/determination means 29 pours high-temperature hot water into the remaining hot water in the bathtub 6 to determine the required water level X and the set water level H.
The operation of comparing and determining will be explained. Figure 3 shows a state in which hot water is supplied from the hot water supply circuit 1 at the maximum hot water supply temperature A (°C) to the required water level X, with the remaining hot water in the bathtub 6 at a temperature t (°C) and a water level h. It shows. The set water level H is set by the water level setting unit 5, and the remaining water temperature t (°C) is determined by the bath temperature detector 22.
The remaining water level h is detected by the water level sensor 27 and the reading means 28.

As shown in FIG. 1, the comparison/judgment means 29 receives the residual water temperature t (° C.), the residual water level h, and the set water level H, and performs calculations set in a microcomputer (not shown). The required water level X is calculated using the formula (A-t) x h/(A-T). Then, this required water level X is compared with the set water level H to determine the water filling operation. When the required water level Remaining hot water temperature t (℃
) has been cooled too much and is at a fairly low temperature. At this time, the comparison/determination means 29, which has determined that it is impossible to fill the bath with hot water alone, instructs the bath reheating control means 31 to control the water filling operation.

Therefore, the bath reheating control means 31 raises the water level in the bathtub 6 from the remaining water level h to the set water level H, and sets the maximum hot water supply temperature at which the water temperature in the bathtub 6 at this time is as high as possible. Pour hot water at A (℃). Pump 10 at the same time
is driven to heat the bath water circulating in the bath reheating circuit 2 with the bath heater 15, and reheat the bath water to a set temperature T (°C) to complete the water filling operation.

In this way, the water refilling operation of the bath reheating control means 31 by pouring hot water and circulating heating takes longer than the heating time of both bath heaters 15 because the hot water heater 12 has a larger heating capacity than the bath heater 15. The required water filling time can be shortened. In other words, this is achieved by minimizing the time required for cyclic heating, which has a small heating capacity, since it starts from the highest possible temperature.

Next, when the required water level Instructs water movements. The hot water supply control circuit 30 attempts to shorten the required water filling time by increasing the hot water supply flow rate per unit time as much as possible. Then, the required hot water supply temperature Y (°C) is calculated using the equation 3 stored in a microcomputer (not shown), and hot water is poured to the set water level H at this Y (°C). In this way, the required refilling time is further shortened than when using the bath reheating control means 31.

[0021] The water charging operation of the hot water supply control circuit 30 is designed to streamline the arithmetic processing by a microcomputer, and hot water is poured at the maximum hot water supply temperature A (°C) up to the required water level X calculated using the above calculation formula. Next, from the required water level X to the set water level H
It is also possible to use hot water at a set temperature T (°C).

As described above, according to the above embodiment, the bathtub 6
When the remaining hot water temperature t (℃) is low, the maximum hot water supply temperature A (℃)
First, the hot water is poured in, and the temperature of the bathtub water at the set water level H is set to the highest temperature, which has the effect of reheating the bathtub in a shorter time than before. In addition, comparative judgment means 2 shows that water can be filled with only hot water.
Since 9 can be determined, it is possible to eliminate the uneconomical operation of pouring hot water when the remaining water temperature is low and then discarding the hot water wastefully because it is impossible to take a bath. Then, when the remaining hot water temperature t (° C.) is high, the required hot water supply temperature Y is calculated using the calculation formula (H×T−h×t)/(H−h), and water filling can be completed in a short time. Furthermore, the comparison/judgment means 29 that receives signals such as the residual hot water temperature t (°C) and the residual hot water level h automatically determines a desirable water filling operation to shorten the water filling time and at the same time to improve the economical operation. can also be improved.

[0023]

[Effects of the Invention] As is clear from the above explanation, the bath water supply device of the present invention aims to automate the operation of using the remaining hot water in the bathtub, and selects an effective filling operation according to the state of the remaining hot water. It can shorten the water filling time and improve the economic efficiency of operation.

[Brief explanation of the drawing]

FIG. 1: Flowchart of an embodiment of the bath water heater of the present invention

[Figure 2] Same configuration diagram

[Figure 3] State diagram of the bathtub

[Figure 4] Configuration diagram of conventional example

[Explanation of symbols]

6 Bathtub 29 Comparative judgment means 30 Hot water control circuit 31 Bath reheating control circuit

Claims (1)

[Claims] Claim 1: In order to bring the bathtub to the set temperature T from a state where the residual water temperature is t and the residual water level is h, the required water level X when hot water is supplied at the maximum hot water supply temperature A is calculated as follows: (A-T) and compares the required water level When it's big,
A reheating control circuit that pours hot water from the remaining water level h to the set water level H at the maximum hot water supply temperature A, and instructs to circulate and heat the bathtub water to the set temperature T, and when the required water level X is smaller than the set water level H,
A bath water heater equipped with a hot water control circuit that instructs hot water to be poured from a residual hot water level H to a set water level H.