JPS6131782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stop-start instantaneous water heater that uses gas or oil as fuel.

Instantaneous water heaters, called first stop type, which control the heater by operating a faucet attached to the front of the water heater, are usually relatively large, and are often piped to two or more locations to supply hot water. In the conventional instantaneous water heater of this type, the water supply pipe must be installed in parallel with the hot water supply pipe to the hot water usage area. This is because the degree of use of hot water and water (such as unheated tap water) is often approximately the same, but it is necessary to construct piping for hot water supply and piping for water supply. This method is cumbersome and problematic both in terms of construction costs and construction.

The present invention aims to solve the above-mentioned conventional problems and provides a stop-start type instantaneous water heater that can selectively supply hot water and water through a single pipe.

Next, the configuration of the present invention will be specifically described based on embodiments shown in the drawings.

The stop-start type gas instantaneous water heater as an application example of the present invention shown in FIG. It is mainly composed of Combustor 1
It is composed of a combustion tube 3, a burner 5 connected to a fuel supply pipe 4, an ignition device 6, and the like. The ignition device 6 ignites the burner 5 by a water pressure change caused by water conduction, which is commonly used.
When the water stops, the fuel supply is stopped and the burner 5 is extinguished. However, in this example, the ignition device 6 is controlled so that the water flowing through the water pipe system is stopped within a set time as described later. The number of changes in the flow rate is used as the manipulated variable.

The heat exchanger 2 is installed above the combustion tube 3, and its inlet pipe connects to a water supply pipe 7 that goes around the combustion tube 3, and its outlet pipe connects to a hot water supply port 8.
They are each connected to the hot water outlet pipes 9 leading to the water pipes, forming a series of water pipe systems. The end of the water supply pipe 7 is connected to a connecting pipe from a water supply source, and water can be supplied from the water supply source. The hot water supply port 8 of the hot water outlet pipe 9, which is connected to the water supply pipe 7 via the heat exchanger 2, is normally connected to a hot water supply pipe and connected to a faucet 10 installed in several hot water usage areas such as the bathroom and kitchen. There is. A bypass 7A is configured as a non-heating path in the water supply pipe 7, and water can be sent to a hot water outlet pipe 9 near the hot water supply port 8 without passing through the heat exchanger 2. In addition, the route which introduces water into the heat exchanger 2 with respect to the bypass 7A of the water supply pipe 7 will be called the heating route 7B. A two-position electromagnetic switching valve 11 is interposed at the branching point between the bypass 7A and the heating path 7B in the water supply pipe 7, so that water from the water supply source is transferred from the bypass 7A to the heating path 7.
It is designed so that it can be sent to either one of B. On the upstream side of the branch part of the water supply pipe 7,
A flow meter 12 is provided to measure the flow rate of water flowing through the relevant portion of the water supply pipe 7. This flow meter 12 is a control device 1 composed of an electronic circuit.
3, which measures the number of times the flow rate of water in the water supply pipe 7 changes (number of pulsations) based on opening and closing operations in a short time (Δt), such as the faucet 10 of a hot water usage area connected to the hot water supply port 8. It extracts the signals necessary for control. That is, as shown in FIG. 2, an instruction is given for non-heating supply to close and open the faucet 10 once in a period of time (Δt);
That is, the close-open-close-open operation is set as a heating supply instruction, and the instruction content by operating the faucet 10 is detected by the flow meter 12 and the control device 1
The comparison unit, adjustment unit, etc. of No. 3 process the processing to control the controlled object according to the target.

The controlled object is the electromagnetic switching valve 11, and the combustor 1
This is the ignition device 6. In other words, the user
When a non-heating supply instruction is issued by closing and opening once every (Δt) time, the flow rate of the water supply pipe 7 pulsates accordingly. The flow meter 12 detects this number of pulsations, and if heating supply is being performed, the fuel supply from the burner 5 is stopped and the electromagnetic switching valve 11 is switched to the bypass 7A side. Therefore, unheated water that has passed through the bypass 7A without passing through the heat exchanger 2 is supplied from the user's faucet 10. In this case, if the instruction content matches the current situation, there is no need for control, and that state will be maintained.

Next, when the faucet 10 is turned on twice in (Δt) time, the flow meter 12 detects the two pulsations and extracts a heating supply signal. The match with the target is then determined based on that signal. That is, if the burner 5 is off, the burner 5 is ignited and, prior to this, the electromagnetic switching valve 11 is switched to the heating path 7B side.

It should be noted that the ignition device 6 may be simply configured as a control object without adopting a branching method using the electromagnetic switching valve 11 and the bypass 7A, but in this case, the delivery exchanger 2
Since cold water is passed through the pipes, water vapor can condense in high humidity conditions such as in the summer, which can lead to corrosion of parts. However, the problem caused by water vapor condensation can be solved by other measures, and the above-mentioned measures are basically the same as those of the embodiment of the present invention. and water supply are alternatively possible.

As is clear from the above description of the embodiments, the present invention includes a flow rate measuring device that detects the number of changes in the flow rate of a water supply pipe based on the short-time opening and closing operations of a faucet installed in a hot water usage area. This is an instantaneous water heater that can selectively supply non-heating or heating by controlling the heater according to the setting of the number of changes in flow rate. Either supply can be enabled. Therefore,
Not only can the materials and time for piping work be halved, but it also has the advantage of reducing restrictions on building construction. Furthermore, switching between hot water supply and water supply can be easily performed at the hot water usage area, so the advantages of the pre-stop type can be fully utilized.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the configuration of a stop-start gas instantaneous water heater as an application example of the present invention, and FIG. 2 is an explanatory diagram showing an example of an instruction pattern for operating a faucet. Note that the same reference numerals in the figures indicate the same or equivalent parts. 1... Combustor, 2... Heat exchanger, 6... Ignition device, 7... Water supply pipe, 7A... Bypass, 7B...
Heating route, 8...Hot water inlet, 10...Faucet, 11...
...Solenoid switching valve, 12...Flow rate measuring device, 13...Control device.

Claims (1)

[Claims] 1. A water supply pipe connected to the hot water supply inlet via the heat exchanger and connected to the water supply source is branched via a switching valve on the upstream side of the heat exchanger and connected to the hot water supply inlet side,
On the water supply side of the water supply pipe, the number of changes in the amount of water flowing in the water supply pipe within a predetermined period of time is measured due to short-term opening and closing operations of a faucet connected to the hot water supply port and attached to the hot water usage area. Equipped with a flow rate measuring device, inputting the measured value of this flow rate measuring device to an electronic circuit and configuring a control signal according to the classification of the measured value,
An instant water heater characterized in that it is configured to perform hot water supply control by operating control objects such as a heater facing the heat exchanger and a switching valve provided for the water supply pipe.