JPH0830591B2 - Water heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater in which a dedicated hot water circuit is provided in a bathtub or the like in addition to a normal faucet circuit in the water heater.

2. Description of the Related Art In recent years, a water heater with a dedicated hot water supply circuit for a bathtub has been used, which has a function of automatically filling the bathtub with hot water or adding hot water. In FIG. 3, a heat exchanger 2 is provided in a water supply passage 1, a first hot water supply passage 3 to a faucet branched downstream of the heat exchanger, and a second hot water supply passage 3 which is led to a bath 4 and has an opening / closing valve 5.
Hot water supply passage, a temperature sensor 7 provided at the outlet of the heat exchanger 2, and a controller 8 for opening and closing the second hot water supply passage and changing the hot water temperature setting of the hot water temperature control by the temperature sensor 7. ing.

Problems to be Solved by the Invention In the above-mentioned configuration, when the second hot water supply passage is closed, the hot water temperature is set to the normal faucet operating temperature (hereinafter referred to as the initial drop temperature). When the controller 8 gives an instruction to fill the bathtub with hot water, the on-off valve 5 is opened and the bath temperature setting is automatically changed to the bath temperature, for example, 45 ° C.

When the high temperature hot water is instructed, the on-off valve 5 is opened and the hot water temperature is automatically changed to a high temperature (60 to 90 ° C) to supply hot water to the bathtub. However, the problem (1) is that there is no means for regulating the flow rate, so the capacity of the heat source is insufficient and the required temperature cannot be obtained. In order to solve this problem, two systems are required, one for automatic hot water supply, which requires a large flow rate, and one for small flow rate high-temperature hot water, and an on-off valve. (2) There is a risk that the hot water remaining in the heat exchanger will be discharged from the faucet circuit after the hot water is finished.

It had a problem such as.

Means for Solving the Problems In order to solve the above problems, the present invention provides a flow rate sensor in a water supply passage, and opens and closes the hot water supply in the second hot water supply passage and feeds back a signal of the flow rate sensor for continuous flow rate control. A flow rate control valve and flow rate control unit are provided to set the set flow rate to a small flow rate and set the temperature to a high temperature during high temperature hot water operation, and once the high temperature hot water finishes, set the flow rate to a large flow rate and set the temperature to a low temperature. After that, a high-temperature hot water operation part for closing the flow control valve is provided.

With the above structure, the flow rate of the hot water supply passage 2 is feedback-controlled to a small flow rate by the flow rate sensor and the flow rate control valve at the time of high-temperature hot water, and the hot water temperature does not decrease due to insufficient capacity of the heat source. The set temperature is set to a low temperature, the set flow rate is set to a large flow rate, the high temperature hot water remaining in the heat exchanger is discharged to the bathtub at a large flow rate in a short time, and then the flow rate control valve is closed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a fixed blade 12 that generates a swirl flow in the water supply channel 11, a magnetic ball 13 that rotates downstream of the fixed blade 12 along the inner diameter of the flow path by the swirl flow, and rotation detection that detects the movement of the ball 13 The flow rate sensor 5 is configured with the device 14, the heat exchanger 2 is provided downstream thereof, and the temperature sensor 7 is provided at the outlet of the heat exchanger 2, and the first hot water supply passage 3 to the faucet branched downstream of the heat exchanger 2 is provided. When,
A second hot water supply passage 6 is provided which is guided to the bathtub 4 via the flow rate control valve 16, and the flow rate control valve 16 is a speed reducer by a motor 18 on a valve body 17.
19, the drive shaft 20 through the drive gears 20 and 21, and the screw shaft 23
A water stop valve 25 that is linearly driven by the drive shaft 22 and is connected to the drive shaft 22 by being pushed by a spring 24; Composed of. The signal of the flow rate sensor 5 passes through the flow rate calculation section 28 and the flow rate setting signal 30 from the operation section 29 having the warming button 34.
And the deviation is compared with the deviation amplification section that constitutes the flow rate control section
It is amplified by 31 and drives the motor 18. On the other hand, the temperature signal from the temperature sensor 7 is compared with the temperature setting signal 32 from the operating section, and the deviation of the temperature signal controls the hot water temperature control section 33 to control the heat quantity of a heat source (not shown) such as a burner or a heater.

In the above configuration, when the second hot water supply passage 6 is closed, the operation unit
29 outputs an initial value temperature setting signal 32 to determine the faucet operating temperature. When the hot water button 34 is pressed, FIG. 2 (A)
As described above, the operation unit outputs the high temperature temperature setting signal 32 and the low flow rate setting signal 30. Since the water stop valve 25 is in the closed state, a flow rate deviation occurs, a voltage is applied to the motor 18 to move the drive shaft 22 to open the water stop valve 25, and the drive shaft 22 further advances to be pushed by the shaft step 26 to flow the flow. The control valve body 27 opens. When the flow rate flows, the magnetic ball 13 rotates and the flow rate calculation unit
A signal is applied to 28 and is fed back to the motor 18 so that the flow rate becomes equal to the flow rate setting signal 30, and the motor 18 stops when the deviation disappears. Therefore, the flow rate is maintained at a value almost equal to the flow rate setting signal 30 even if the water pressure or load resistance changes, and the hot water temperature is maintained at the set high temperature without causing the heat source to have insufficient capacity and effective high temperature boiling water is performed. Be done.
Further, if the hot water button 34 is operated or the hot water state is released by a limit timer (not shown), the operation section
29 outputs a low temperature setting signal 32 as shown in FIG. 2 (B) and a large flow rate setting signal 30 and remains in the heat exchanger 2 as shown in FIG. 2 (C). The hot water temperature is lowered while promptly discharging hot water into the bathtub. After that, at the time of FIG. 2 (D), the initial value of the hot water temperature setting signal is output, the flow rate setting signal 30 is set to zero, and the flow rate control valve 16 is closed. In this way, the hot water is quickly returned to the use condition and the hot water remaining in the heat exchanger 2 is discharged into the bathtub, so that the danger of hot water coming out of the tap carelessly can be prevented. Although not shown, the first hot water supply passage 3 is open while the second hot water supply passage 6 is open.
It is possible to secure a higher level of safety because it can be used together with a means to display or report the use of high temperature with a lamp, buzzer, etc.

EFFECTS OF THE INVENTION As described above, according to the present invention, the flow rate control valve and the flow rate control which provide the flow rate sensor in the water supply channel and open / close the hot water supply in the second hot water supply channel and feed back the signal of the flow rate sensor to perform continuous flow rate control. A part is provided to set the flow rate to a small flow rate and set the temperature to a high temperature during high-temperature hot water operation.At the end of the high-temperature hot water, once the set flow rate is set to a high flow rate and the set temperature is set to a low temperature, the flow control valve is Due to the configuration with a high temperature hot water operation part that closes, (1) it acts to keep the flow rate during high temperature use at a constant low flow rate regardless of changes in water pressure and load resistance. Eliminates and supplies stable high temperature hot water for effective high temperature hot water.

(2) It is possible to prevent the risk of inadvertently discharging high-temperature hot water from the first hot water supply path by quickly discharging the high-temperature hot water remaining in the heat exchanger to the bathtub when the hot water is used up.

The effect is large.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a water heater according to an embodiment of the present invention, FIG. 2 is a characteristic diagram showing changes in hot water temperature and flow rate when the second hot water supply passage of the water heater is used, and FIG. 3 is a conventional hot water heater. It is a block diagram of a container. 2 ... Heat exchanger, 5 ... Flow rate sensor, 3 ... First hot water supply passage, 6 ... Second hot water supply passage, 16 ... Flow control valve, 29 ... Operation part, 33 ... Hot water temperature control part.

Claims (1)

[Claims] 1. A flow rate sensor provided in a heat exchanger and a water supply passage for generating a signal proportional to the amount of water supplied, and a first hot water supply passage to a faucet and a bathtub provided in a branch downstream of the heat exchanger. Of the heat exchanger, a second hot water supply path to the heat exchanger, a flow rate control valve and a flow rate control unit which are provided in the second hot water supply path and which controls the continuous flow rate by opening and closing the hot water supply and feeding back the signal of the flow rate sensor. A temperature sensor provided at the outlet and a hot water temperature control unit that controls the hot water temperature by adjusting the amount of heat to the heat exchanger according to the signal of the temperature sensor, and the flow rate control unit when the hot water is poured into the bathtub. Set the set flow rate to a small flow rate, set the set temperature of the hot water temperature control unit to a high value, and set the set flow rate to a large flow rate and set the set temperature to a low value before finishing the high temperature hot water operation. Close the flow control valve after setting Water heater provided with the operation unit.