JPH0659752U - Water heater - Google Patents

Abstract

(57) [Abstract] [Purpose] There is no false detection of hot water supply interrupt during bath pouring,
Another object of the present invention is to provide a hot water supply device capable of stable and reliable hot water supply interruption. [Structure] A hot water supply pipe 11 provided with a hot water supply flow sensor 6 connected to a control circuit 7, a heat exchanger 5 connected to the hot water supply pipe 11, and a hot water supply pipe on the outlet side of the heat exchanger 5 are branched and one side is provided with a check valve 3 A hot water supply pipe 13 provided with a hot water supply pipe 13 and a bath pipe 12 provided with a flow rate adjusting valve 4 connected to the control circuit 7 on the other side, and hot water supply pipe 13 and water supply pipe 11 downstream of the check valve 3 In a water heater capable of interrupting hot water supply, which comprises a device 1 and a bypass pipe 14 provided with a water solenoid valve 2 connected to a control circuit 7, hot water is exchanged by opening a hot water tap 8 of a hot water pipe 13 during bath hot water supply. When the water flows from the water heater 5 into the hot water supply pipe 13 and the water flows from the water supply pipe 11 into the hot water supply pipe 13 through the bypass pipe 14, and the water flow rate detection device 1 provided in the bypass pipe 14 maintains a constant flow rate for a certain time or longer. When detecting the condition, through the control circuit 7 by the signal of water detecting device 1 to interrupt hot water to close the flow control valve 4 and the water solenoid valve 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a water heater having a hot water interrupt function during hot water supply in a bath.

[0002]

[Prior art]

 A conventional water heater having an interruption function will be described below with reference to FIG. 1 of the embodiment of the present invention and based on the sequence of the conventional water heater shown in FIG. In the bath pouring operation, first, the flow control valve 4 provided in the bath pipe 12 and the water solenoid valve 2 provided in the bypass pipe 14 are opened by the control circuit 7, and the water in the water supply pipe 11 is a heat exchanger. The water flows into the bath pipe 12 through 5 and is poured into the bath. Then, when the flow rate of water flowing through the heat exchanger 5 during the opening operation of the flow rate control valve 4 is 3 l / min or more, which is the combustible flow rate, is detected by the hot water supply flow sensor 6 provided in the water supply pipe 11, At the same time that the signal is input to the control circuit 7 to start combustion, the flow rate control valve 4 controls the bath pouring flow rate so that maximum combustion is possible.

At this time, when the hot water tap 8 connected to the end portion of the hot water supply pipe 13 is opened during the bath pouring to provide interrupt hot water supply, the bypass valve in which the water solenoid valve 2 is opened from the water supply pipe 11 is opened. It flows into the hot water supply pipe 13 through the pipe 14, is mixed with the hot water in the hot water supply pipe 13, and flows out from the hot water tap 8. When the water amount detection device 1 provided in the bypass pipe 14 detects a water amount equal to or more than the set water amount, it is immediately judged to be a hot water supply interruption, and the signal of the water amount detection device 1 is used to close the flow control valve 4 and the water solenoid valve 2. Allow hot water to be used. When using the hot water supply by the hot water supply interrupt, the hot water supply flow sensor 6 determines that the hot water supply has ended when the flow rate is below 1.9 l / min, and restarts pouring the bath.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, the backflow from the bypass pipe 14 to the bath pipe 12 is prevented by the check valve 3 provided in the hot water supply pipe 13 without the spring when pouring the bath. Due to the structure of the valve 3, the check effect does not appear unless the back pressure from the bath pipe 12 is generated. That is, when the flow rate control valve 4 provided in the bath pipe 12 and the hot water tap 8 provided in the hot water supply pipe 13 are closed, the water pressure from the water supply pipe 11 and the heat exchanger 5 and the water pressure from the bypass pipe 14 Does not flow backwards because it is almost uniform. However, when the flow control valve 4 provided in the bath pipe 12 is opened and pouring into the bath is started, the water solenoid valve 2 is opened and the flow control valve 4 is opened at the same time. Since the pressure in the hot water supply pipe 13 from the exchanger 5 to the check valve is low, the water in the bypass pipe 14 becomes instantaneous reverse flow water and the flow rate in the check valve 3 and the bath pipe 12 in the hot water supply pipe 13 is increased. It passes through the regulating valve 4 and flows into the bath 9. It should be noted that the amount and time of the backflow water are not constant depending on the water supply pressure, the valve body position inside the check valve 3, and the like. Therefore, there is a problem that the water amount detection device 1 erroneously detects a hot water supply interrupt even if the hot water supply plug 8 is closed.

The present invention has been made in view of the above problems, and provides a hot water supply device capable of stable and reliable hot water supply interruption without erroneous detection of hot water supply interruption detection during bath pouring. This is the purpose.

[0006]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiment. The present invention is a water supply pipe provided with a hot water supply flow sensor connected to a control circuit, A heat exchanger connected to the water supply pipe, a hot water supply pipe that branches the hot water supply pipe on the outlet side of the heat exchanger and has a check valve on one side, and a bath pipe with a flow control valve connected to the control circuit on the other side, and a check A hot water supply device that consists of a hot water supply pipe on the downstream side of the valve and a water supply pipe connected to a control circuit and a bypass pipe provided with a water solenoid valve connected to the control circuit. By opening the hot water tap, hot water flows from the heat exchanger into the hot water supply pipe, and water flows from the water supply pipe into the hot water supply pipe through the bypass pipe, and the water amount detection device installed in the bypass pipe is set. When the flow rate is constant Or when detecting continued condition when has taken technical means to interrupt hot water to close the flow control valve and water solenoid valves through the control circuit by signal of water detector.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 11 denotes a water supply pipe connected from the water supply source to the inlet of the heat exchanger 5, and a hot water supply flow sensor 6 connected to a control circuit 7 is provided in the middle of the pipe 11. Reference numeral 13 is a hot water supply pipe in which a check valve 3 for branching the hot water supply pipe on the outlet side of the heat exchanger 5 is provided to keep the flow of hot water constant and a water supply tap 8 is provided at the end. Reference numeral 12 is a bath pipe in which a hot water supply pipe on the outlet side of the heat exchanger 5 is branched and a flow control valve 4 for connecting the control circuit 7 to adjust the amount of hot water is provided in the middle and a terminal is connected to a bath 6. 14 is provided with a water amount detecting device 1 which is connected to the control circuit 7 on the way and detects the amount of water at the time of hot water supply, and a water solenoid valve 2 which is connected to the control circuit 7 to supply and stop the water. It is a bypass pipe connecting the downstream side of the check valve 3 and the water supply pipe 11.

To operate the bath pouring, first, a signal to start pouring the bath into the bath is sent to the control circuit 7 by a remote controller or the like to open the flow control valve 4 provided in the bath pipe 12. When the flow rate of water flowing through the heat exchanger 5 during the opening operation of the flow rate control valve 4 is 3 L / min or more, which is the combustible flow rate, when the hot water supply flow sensor 6 provided in the water supply pipe 11 detects the signal, the signal is sent to the control circuit 7. Is input to the burner, and the signal from the control circuit 7 causes the burner to start combustion, and the signal from the control circuit 7 opens the water solenoid valve 2 provided in the bypass pipe 14. The flow rate control valve 4 controls the pouring flow rate so that maximum combustion is possible.

At this time, when the hot water supply plug 8 connected to the end of the hot water supply pipe 13 is opened to interrupt the hot water supply, the water amount detection device 1 provided in the bypass pipe 14 detects a flow rate of 2 l / min or more for 1 second or more. When it is judged that it is a hot water supply interrupt, the signal is input to the control circuit 7 and the flow control valve 4 and the water solenoid valve 2 are closed by the signal of the control circuit, and the pouring water is once put in the standby state. Enable use.

[0010]

[Effect of device]

 In the present invention, by opening the hot water tap of the hot water supply pipe during bath hot water supply, hot water flows into the hot water supply pipe from the heat exchanger, and water flows from the water supply pipe into the hot water supply pipe through the bypass pipe and bypasses. When the water flow detector installed in the pipe detects a condition where the constant flow rate continues for a certain period of time or longer, the flow control valve and the water solenoid valve are closed via the control circuit by the signal of the water flow detector to interrupt hot water supply. With this configuration, it is possible to provide a hot-water supply device capable of stable and reliable hot-water supply interruption without false detection of hot-water supply interruption detection during bath pouring.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing an embodiment of the present invention.

FIG. 3 is a flowchart showing a conventional embodiment.

[Explanation of symbols]

1. Water amount detector 2. Water solenoid valve 3. Check valve 4. Flow control valve 5. Heat exchanger 6. Hot water supply flow sensor 7. Control circuit 8. Hot water tap 9. Bath 10. Water heater 11. Water supply pipe 12. Bath piping 13. Hot water supply piping 14. Bypass piping

Claims (1)

[Scope of utility model registration request] 1. A water supply pipe 11 provided with a hot water supply flow sensor 6 connected to a control circuit 7, a heat exchanger 5 connected to the water supply pipe 11, and a hot water supply pipe on the outlet side of the heat exchanger 5 are branched and non-returned to one side. The hot water supply pipe 13 provided with the valve 3 and the bath pipe 12 provided with the flow rate adjusting valve 4 connected to the control circuit 7 on the other side, and the hot water supply pipe 13 and the water supply pipe 11 downstream of the check valve 3 are connected to the control circuit 7. In a water heater capable of interrupting hot water supply, which comprises a water amount detection device 1 and a bypass pipe 14 provided with a water solenoid valve 2 connected to a control circuit 7, a hot water supply pipe 13 is provided during hot water supply in a bath.
By opening the hot water supply plug 8 of the above, hot water flows into the hot water supply pipe 13 from the heat exchanger 5, and water flows from the water supply pipe 11 into the hot water supply pipe 13 via the bypass pipe 14 and is provided in the bypass pipe 14. When the water amount detecting device 1 detects a condition in which a constant flow rate continues for a certain period of time or more, a signal from the water amount detecting device 1 causes the flow control valve 4 and the water solenoid valve 2 to be closed via the control circuit 7 to interrupt hot water supply. A water heater characterized by being able to.