JP3740199B2 - Instantaneous water heater with measuring means - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an instantaneous water heater with a measuring means, and in particular, when supplying hot water to a bathtub using the main water heater, measuring means capable of automatically stopping hot water supply when a certain amount of hot water is supplied to the bathtub. It relates to an attached water heater.
[0002]
[Prior art]
When hot water is supplied from the hot water pipe through the instantaneous water heater to the bathtub, when a predetermined amount of hot water is supplied by the measuring means provided in the instantaneous water heater, an alarm such as a buzzer sounds and the person stops the hot water tap. . If a hot water supply pipe dedicated to the bathtub is provided, an open / close valve may be provided in the hot water supply pipe, and this open / close valve may be automatically closed when a certain amount of hot water is supplied. Therefore, if this on-off valve is closed, hot water cannot be supplied thereafter, and if the on-off valve is opened without closing the hot water tap of the bathtub, there is a problem that more hot water is supplied to the bathtub. In addition, it is difficult to provide hot water pipes dedicated to bathtubs after construction, accompanied by large-scale construction. Therefore, a hot water supply pipe having a plurality of hot water taps is not provided with an on-off valve.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide an instantaneous water heater with a measuring means that solves the above-mentioned problems.
[0004]
[Means for Solving the Problems]
The present invention is an instantaneous water heater with measuring means used in a hot water supply system having a hot water supply pipe that can supply hot water through a hot water tap at a plurality of locations.
An on-off valve provided in a hot water supply pipe in the instantaneous water heater with measuring means;
When it is detected by the measuring means that the amount of flowing water has reached a predetermined amount, the on-off valve is closed, and it is detected that all of the hot-water taps have been closed within a predetermined time after the on-off valve is closed. And an instantaneous water heater with a metering means.
According to the present invention, the hot water pipe is provided with an on-off valve, which automatically closes when a predetermined amount of hot water is supplied, and automatically when all the hot water taps are closed within a certain time. Open again. As a result, the subsequent hot water supply is performed without any problem.
[0005]
Further, the present invention is a pressure detector provided in an air pipe connected between the on-off valve and the hot water tap, the means for detecting that all the hot water taps are closed,
Part of the combustion air of the instantaneous water heater with metering means is connected to the air pipe via an air on / off valve, and the air on / off valve is controlled to open by the control means when the on / off valve is closed. It is characterized by.
According to the present invention, all the hot-water taps are closed by detecting the pressure of the combustion air in the instantaneous water heater with measuring means. Combustion air is supplied by a blower or the like. After the instantaneous water heater with measuring means is stopped by closing the on-off valve, the air blower is operated for about 5 minutes in order to cool the instantaneous water heater with measuring means, and air continues to be sent during this time. Since a part of the combustion air (actually cooling air) is used during this period, all the hot-water taps are simply constructed by simply connecting an air pipe having an air on-off valve to the hot water pipe without requiring any special equipment. Closed is detected.
[0006]
Further, the invention is characterized in that an alarm is issued when the on-off valve is closed.
According to the present invention, since an alarm such as a buzzer is issued when the on-off valve is closed, for example, it is informed that a specified amount of hot water has been supplied to the bathtub, and the hot water tap for the bathtub may be closed within a certain time. Even if an alarm is issued, it is not necessary to immediately close the bathtub water tap as in the prior art.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described more specifically with reference to the drawings.
[0008]
FIG. 1 is a system diagram of a hot water supply system using an instantaneous water heater with metering means (hereinafter sometimes abbreviated as “water heater”) 10 according to an embodiment of the present invention. When tap water is supplied to the water heater 10 from the water supply pipe 1 and a water flow is detected by the flow rate detector 11, the air blower 14 is first operated by the controller 20, and the inside of the water heater 10 is purged for 5 seconds, for example. To do. A fuel gas such as city gas is supplied from the gas pipe 2, and when purging in the water heater 10 is finished, the gas valve 12 is opened, the burner 13 is ignited by an ignition device (not shown), and burns with air from the blower 14. . The heat of the combustion gas is mainly given to water by the heat exchanger 14, and the combustion gas is discharged to the outside from the exhaust port 15. Hot water heated by the heat exchanger 14 passes through the on-off valve 15 and is supplied from the hot water supply pipe 5 to the necessary places such as the kitchen, the washroom, and the bathtub 9 through the plurality of hot water taps 6, 7, 8. When the water flow is no longer detected by the flow rate detector 11, the gas valve 12 is closed, but the blower 14 continues to operate, for example, for 5 minutes until the heat exchanger 14 is cooled. The flow rate detector 11 is composed of a flow rate sensor, and has a measuring means for detecting the water flow and detecting the amount of water flow. In addition, when supplying hot water to the bathtub 9, if the amount of flowing water is input to the controller 20 in advance, the opening / closing valve 15 is closed when the amount of flowing water reaches that amount, and the hot water to the bathtub 9 is stopped and attached to the controller 20. A warning is issued from the buzzer 23. When the on-off valve 15 is closed, the air on-off valve 16 provided in the air pipe 17 is opened, and a part of the air from the blower 14 flows to the hot water supply pipe 5 through the air on-off valve 16 and the check valve 18. The check valve 18 is provided to prevent warm water from flowing to the blower 14 side. If all of the hot water taps 6, 7, 8 are closed, the air in the air pipe 17 is in a pressurized state. This air pressure is detected by the pressure detector 19, thereby opening the on-off valve 15 again. The hot water supply pipe 5 is provided with a temperature detector 22, and the opening degree of the gas valve 12 is adjusted so that the hot water temperature becomes a predetermined temperature during the steady operation of the water heater 10.
[0009]
FIG. 2 is a connection diagram illustrating a connection relationship between the controller 20 and each device. The controller 20 receives information about the water flow and the amount of water flow from the flow rate detector 11, information about the pressure from the pressure detector 19, and temperature information from the temperature detector 22. Based on these, the blower 14 is operated and stopped, the gas valve 15 is opened and closed, the opening is adjusted, the on-off valve 15 and the air on-off valve 16 are opened, and the buzzer 23 is blown.
[0010]
FIG. 3 is a flowchart showing an operation state of the controller 20. In step S0, it is confirmed that the on-off valve 15 is open in step S1. If the opening / closing valve 15 is closed, the buzzer 23 is blown in step S2 to instruct the opening / closing valve 15 to be opened. If the on-off valve 15 is open, the process proceeds to step S3, and it is determined whether or not the flow rate of water passing through the water heater 10 has been input. For example, when hot water is supplied to the bathtub 9, a preferable flow rate is input from the input means of the controller 20. If the flow rate has been input, the process proceeds to step S4, and it is determined whether or not the flowing water detector 11 has detected flowing water. If the hot water tap 8 for the bathtub 9 is opened, the flowing water detector 11 detects the flowing water, and the process proceeds to step S5. In step S5, the blower 14 is operated, the inside of the water heater 10 is purged, and when the purge is completed, the gas valve 12 is opened and burned by the burner 13. The temperature of the hot water is detected by the temperature detector 22, and the opening degree of the gas valve 12 is adjusted so as to be a predetermined temperature. These series of operations are displayed as operation of the water heater 10 in step S5. In step S6, it is determined whether or not the amount of flowing water has reached a specified amount. If the amount of flowing water has reached, the process proceeds to step S7, the on-off valve 12 is closed, the gas valve is closed in step S8, and the air on-off valve 16 is opened in step S9. In step S10, the buzzer 23 is blown. As a result, the hot water supply to the bathtub 9 is completed, and this is notified, and the process proceeds to step S11. If the hot water tap 8 for bathtubs is closed, the pressure is accumulated in the air pipe 17, the pressure detector 19 detects the pressure, the process proceeds to step S12, and the on-off valve 15 is opened to complete the operation. If the hot-water tap 8 is not closed, the buzzer 23 continues to sound.
[0011]
In a state where no flow rate is input in step S3, as shown in steps S14 to S16, the water heater 10 is operated when the flowing water detector 11 detects flowing water, and is stopped when no flowing water is detected.
[0012]
As another example, the air blower 14 may be configured not to stop until the on-off valve 15 is opened, that is, until the bathtub hot water tap 8 is closed.
[0013]
【The invention's effect】
According to the present invention, when a predetermined amount of water passes through the water heater, the on-off valve provided in the hot water supply pipe is closed, and at the same time, this is notified by a buzzer or the like. Accordingly, for example, when a hot water tap in use such as a hot water tap for a bathtub is closed, the on-off valve is automatically opened, and there is no hindrance to the subsequent hot water supply.
[0014]
Further, according to the present invention, it is possible to detect that the hot water tap in use is closed by using a part of the air of the combustion blower, so that only a slight modification to the conventional water heater is required. .
[Brief description of the drawings]
FIG. 1 is a system diagram of a hot water supply system using an instantaneous water heater with metering means 10 according to an embodiment of the present invention.
FIG. 2 is a connection diagram illustrating a connection relationship between a controller 20 and each device.
FIG. 3 is a flowchart showing an operating state of the controller 20;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water supply pipe 2 Gas pipe 5 Hot-water supply pipe 8 Hot-water tap for bathtub 9 Bathtub 10 Instantaneous water heater with measuring means 11 Flow rate detector 12 Gas valve 15 On-off valve 16 Air on-off valve 17 Air pipe 19 Pressure detector 20 Controller 23 Buzzer

Claims (3)

In an instantaneous water heater with a measuring means used in a hot water supply system having a hot water supply pipe that can supply hot water via a hot water tap at a plurality of locations
An on-off valve provided in a hot water supply pipe in the instantaneous water heater with measuring means;
When it is detected by the measuring means that the amount of flowing water has reached a predetermined amount, the on-off valve is closed, and it is detected that all of the hot-water taps have been closed within a predetermined time after the on-off valve is closed. And an instantaneous water heater with metering means. The means for detecting that all of the hot water taps are closed is a pressure detector provided in an air pipe connected between the on-off valve and the hot water tap,
Part of the combustion air of the instantaneous water heater with metering means is connected to the air pipe via an air on / off valve, and the air on / off valve is controlled to open by the control means when the on / off valve is closed. The instantaneous water heater with a measuring means according to claim 1. The instantaneous water heater with a metering means according to claim 1 or 2, wherein an alarm is issued when the on-off valve is closed.

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