JPH04353352A - Hot water feeding device for bath tub - Google Patents

Abstract

PURPOSE:To replace air with hot water and to feed always hot water to a bath tub water level by a method wherein when a hot water feeding means is being operated, a circulating means is operated for a predetermined period of time before the hot water reaches a set water level. CONSTITUTION:When an operation switch 20 and an automatic hot water feeding switch 21 are turned on, a hot water feeding instruction is given to a control part C and then a hot water feeding is started. After a set time elapses upon starting a hot water feeding, a circulation pump 6 is operated for a predetermined period of time. It is so set that a bath tub water level does not reach the set water level within a set time. Upon completion of hot water feeding, the circulating instruction is given again, and the circulation pump 6 is operated. In the case that a temperature in the bath tub water reaches a target temperature under this condition, the circulation pump 6 is stopped. In turn, in the case that the bath tub water temperature does not reach the target temperature, an additional boiling is carried out at an additional boiling part B until it reaches the target temperature. After stopping of the additional boiling, the circulation pump 6 is stopped after a predetermined time elapses. With such an arrangement, air stay the branch passage is replaced with hot water and thereafter even if the circulating means is operated with the additional boiled-up hot water feeding, a reduction in the water level in the bath tub can be restricted.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention is provided with a hot water supply means for supplying hot water to a bathtub through a hot water supply path, and a circulation means for circulating hot water in the bathtub through a circulation path. A detection means for detecting whether the water level of the bathtub has reached a set water level is attached to the tip of a branch path branching from the upstream side of the circulation means, and operates the hot water supply means until the water level reaches the set water level based on a hot water supply command. The present invention also relates to a hot water supply device for a bathtub, which is provided with a control means for operating the circulation means based on a circulation command.

0002

2. Description of the Related Art Generally, a diaphragm pressure switch or the like is used as the detection means, and a pump is used as the circulation means. In order to prevent the pressure switch from repeatedly turning on and off due to pulsation of pump pressure when the pump is in operation, it is attached to the tip of a branch path that branches from the upstream side of the circulation means. By the way, conventionally, when hot water is supplied to a bathtub, a circulation command is issued as the water level in the bathtub reaches a set water level.

0003

[Problem to be Solved by the Invention] When the circulation means is operated, negative pressure is generated on the upstream side of the circulation means, so that the air accumulated in the branch passage is discharged, and its replacement with hot water is promoted.
The water level in the bathtub may drop. Furthermore, the status of replacement of the air and hot water in the branch path before the circulation means is activated is not constant, and the pressure acting on the detection means may vary. In other words, if the water is circulated after the water level in the bathtub reaches the set water level, as in the prior art described above, there is a risk that the detection means will not operate reproducibly and errors will occur in the water level of the bathtub. SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks and provide a hot water supply device for a bathtub that can always supply hot water at a stable bathtub water level without being affected by the exchange of air and hot water.

0004

[Means for Solving the Problems] In order to achieve this object, the characteristic configuration of the hot water supply device for a bathtub according to the present invention is such that the control means, when operating the hot water supply means, before reaching the set water level. The circulation means is configured to operate for a predetermined period of time.

[0005]

[Operation] Since the circulation means is activated before the set water level is reached, when the set water level is reached and the hot water supply is completed, the air that has been staying in the branch channel is always replaced with hot water. Therefore, even if the circulation means is operated after that for reheating hot water or the like, replacement with hot water is promoted and the water level in the bathtub can be prevented from lowering. Further, it is possible to suppress the detection means from being affected by the replacement of air and hot water.

[0006]

Effects of the Invention Since the water level of the bathtub can be suppressed from being affected by the exchange of air and hot water, it is possible to obtain a hot water supply device for a bathtub that can always supply hot water to a stable bathtub water level.

[0007]

[Embodiment] An embodiment of the present invention will be explained based on the drawings. As shown in FIG. 1, a bathtub 1, a hot water supply section A serving as a hot water supply means for supplying hot water to the bathtub 1, a reheating section B for reheating the hot water in the bathtub 1, and a hot water supply section A and a reheating section. A hot water supply device for a bathtub is provided with a control section C that controls the water heater B, and a remote controller R that gives commands to the control section C. The hot water supply section A is equipped with a hot water supply heat exchanger 2 and a hot water supply burner 3, and the reheating section B is equipped with a reheating heat exchanger 4 and a reheating burner 5, respectively.

A water supply channel W1 that supplies water to the hot water supply heat exchanger 2, a hot water supply channel W2 that supplies hot water from the hot water supply heat exchanger 2 to the bathtub 1, and a hot water supply channel W2 that supplies water to the bathtub 1 and the bathtub 1 and the reheating heat exchanger 4. A circulation path W3 is provided in which hot water is circulated by a circulation pump 6 as a circulation means. A hot water supply electromagnetic valve 8 is installed in the hot water supply path W2, and a hot water temperature thermistor 9 for detecting the temperature θx of bath water is installed in the circulation path W3. Further, a branch path W branches from the upstream side of the circulation pump 6 of the circulation path W3.
A water level sensor 10 as a detection means for detecting whether the water level of the bathtub has reached a set water level is installed at the tip of the bathtub 4. Gas used in both burners 3 and 5 is supplied via a gas supply path G1. Further, both burners 3 and 5 are each provided with an ignition plug 11. In addition, 12 in the figure is a gas valve.

The remote controller R is provided with an operation switch 20, an automatic hot water supply switch 21, and a hot water temperature setting switch 22 for setting a target temperature θs of bath water.

A hot water temperature thermistor 9, a water level sensor 10, and a remote controller R are connected to the control section C, respectively. The control unit C is configured to automatically supply hot water to the bathtub 1 by controlling the operations of the hot water supply unit A, the reheating unit B, and the circulation pump 6 based on preset and stored information and various input information. There is. In other words, the hot water supply unit A is operated based on the hot water supply command until the set water level is reached, and the circulation pump 6 is operated based on the circulation command. That is, the control means 101 is configured using the control section C.

Next, the automatic hot water supply procedure will be explained based on the flowchart shown in FIG. When the operation switch 20 is turned on, the automatic hot water supply switch 21
When turned on, a hot water supply command is given to the control unit C, and hot water supply is started. After the set time has elapsed after starting hot water supply,
The circulation pump 6 is operated for a predetermined period of time. Note that the setting is made so that the water level in the bathtub does not reach the set water level within this set time. That is, when the hot water supply section A is operated, the circulation pump 6 is operated for a predetermined period of time before the set water level is reached. After the hot water supply is completed, a circulation command is given again and the circulation pump 6 is activated. In this state, it is checked whether the bathtub water temperature θx has reached the target temperature θs. Target temperature θs
When it reaches, the circulation pump 6 is stopped. on the other hand,
When the target temperature θs has not been reached, the reheating section B is operated to perform reheating until the target temperature θs is reached. After stopping refiring,
The circulation pump 6 is stopped after a predetermined period of time has elapsed.

[Another Embodiment] In the above embodiment, the circulation pump 6 is operated for a predetermined period of time after the start of water supply, but for example, if the water level detected by the detection means is lower than the set water level. When the specified water level is reached, the circulation pump 6
may be activated for a predetermined period of time.

[0013]Although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

[Figure 1] Block diagram of control configuration

[Figure 2] Flowchart of control operation

[Explanation of symbols]

1 Bathtub 6 Circulation means 101 Control means A Hot water supply means W2 Hot water supply path W3 Circulation path W4 Branch road

Claims (1)

[Claims] 1. Hot water supply means (A) for supplying hot water to the bathtub (1) via a hot water supply path (W2), and circulation means for circulating hot water in the bathtub (1) via a circulation path (W3). (6)
and the circulation means (6) of the circulation path (W3).
) detecting means (10
) is attached, and a control means (101) is provided which operates the hot water supply means (A) until the water level reaches the set water level based on a hot water supply command and operates the circulation means (6) based on a circulation command. A hot water supply device for a bathtub, wherein the control means (101) operates the circulation means (6) for a predetermined time before reaching the set water level when the hot water supply means (A) is operated. A water heater for bathtubs consisting of: