JPH054585B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a multiple water heater parallel operation type water heater that operates a plurality of water heaters in parallel for the purpose of increasing hot water supply capacity.

<Prior art> As shown in FIG. 3, this type of water heater has, for example, two water heaters 1 and 2 placed side by side, and each of the water heaters 1 and 2 has a system in which the hot water temperature does not rise. Water flow control units 3 and 4 are provided to prevent an excessive amount of water from flowing into the water heater, that is, to prevent excessive outflow, and water is supplied from a single water supply device 5 via the water flow control units 3 and 4, The hot water discharged from each of the water heaters 1 and 2 is mixed by a mixing servo mechanism 6, and mixed with water from a water supply device 5 as needed to supply hot water.

<Problems to be Solved by the Invention> By the way, when the water heaters 1 and 2 are operated in parallel and the hot water supply capacity is reduced, it is necessary to stop the water flow to one of the water heaters 2. be. Further, even when only one water heater 1 is used for combustion, it is necessary to only pass water to the other water heater 2 and mix water.

For this reason, conventionally, a solenoid valve 7 has been provided upstream of the water amount adjusting section 3 of one of the water heaters 2.

However, by providing the solenoid valve 7, the number of parts increases, resulting in high cost, and the installation space for the solenoid valve 7 is required, resulting in an increase in the size of the entire device.

<Purpose> Therefore, the present invention solves the above-mentioned conventional problems, and utilizes the water volume adjustment parts 3 and 4, which were conventionally used only for overflow prevention, to provide these adjustment parts 3 and 4 with an overflow prevention function. In addition to water flow control function,
That is, the object of the present invention is to provide a water heater that operates multiple water heaters in parallel, which can reduce costs and downsize by having the function of supplying and stopping water to the water heater.

<Means for Solving the Problems> In order to achieve the above object, the device of the present invention includes a plurality of water heaters 1 each equipped with water volume regulators 3 and 4 that adjust the water volume by opening and closing servo motors for water volume regulation. , 2 are arranged side by side and the water heaters 1 and 2 are operated in parallel. In addition to the overflow prevention circuit that issues a water flow control signal to prevent excess water from flowing into the water heater 2 and controls the servo motor for adjusting the water flow, there is also an overflow prevention circuit that controls the flow of water to the water heater 2 and stops it. The water flow control circuit 10 has a water flow control circuit 10 that controls the servo motor 8, and when the combustion signal for the water heater 2 is not input, the water flow control circuit 10 receives the water flow control signal from the overflow prevention circuit 9. The servo motor 8
It is controlled by a water flow signal and a water flow stop signal, and when a combustion signal for the water heater 2 is input, the water flow control signal from the overflow prevention circuit 9 is given priority and the water flow stop signal is issued. The present invention is characterized in that, when input, the water flow stop signal is given priority over the water flow control signal.

<Function> When the combustion signal is not input to at least one water heater 2, the servo motor of that water heater 2 is turned on by the water flow signal or water flow stop signal from the water flow control circuit. Free access to water and its outage.

When the combustion signal is input to at least one water heater 2, the servo motor 8 of that water heater 2 is driven by the water volume control signal of the overflow prevention circuit 9, and the amount of water flowing to the water heater 2 is controlled. This is done so that it does not become excessive. Preventing an excessive amount of water flowing into a water heater is a means for preventing the temperature of the hot water from rising, and such means have conventionally been provided in water heaters.

Then, when a combustion signal is input to the water heater 2 and a water flow control signal for preventing excessive outflow is being applied, when a water flow stop signal is output from the water flow control circuit 10, the water heater The second servo motor 8 is driven in the direction of stopping water flow.

In this way, the servo motor 8 for adjusting the water volume of at least one water heater 2 is equipped with a water flow control circuit 10 for supplying and stopping water to the water heater 2 in addition to the overflow prevention circuit 9. This eliminates the need for conventional solenoid valves.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 show an embodiment of the present invention,
In these figures, as is clear from FIG. 2, the solenoid valve 7 is excluded, and instead, the first
As shown in the figure, in addition to the overflow prevention circuit 9, a water flow control circuit 10 is connected. Here, the overflow prevention circuit 9 prevents the amount of water flowing into the water heater from exceeding a certain level in order to prevent the water temperature from rising due to an excessive amount of water flowing into the water heater during hot water supply. This is a circuit that issues water flow control signals for this purpose. In addition, the water flow control circuit 10 is connected to the water heater 2.
This is a circuit that issues a water flow signal to cause water to flow to, and also issues a water flow stop signal to stop water flow.

Next, the configuration shown in FIG. 1 will be explained based on its function. If water heater 2 is not ignited now,
Since no combustion signal is input to the combustion signal input terminal 11, it is at a low level.

When the combustion signal input terminal 11 is at a low level, when the microcomputer 12 of the water flow control circuit 10 outputs a high level water flow signal, the signal is transmitted through the four inverters 13 to 16 and the diode 17. The potential at point A becomes high level (the base of transistor 24 becomes low level and is in an open state), and the three inverters 13,
14, 18 and the diode 19, the point B becomes low level (the base of the transistor 25 becomes high level and is in a conductive grounded state). This point A, B
The signal is input to the driver IC 20 of the servo motor 8, and the servo motor 8 is driven to rotate in the opening direction regardless of the output signals from the output terminals 21A and 21B of the microcomputer 21 of the overflow prevention circuit 9. The vessel 2 is now in a state where water is flowing.

In this state (the combustion signal input terminal 11 is at a low level and the output of the microcomputer 12 of the water flow control circuit 10 is at a high level), when the water heater 2 is ignited and the combustion signal input terminal 11 becomes a high level, The output of the inverter 26 becomes low level, and the contact C downstream of the resistor 28 is changed to low level via the diode 27.
Furthermore, point A is changed to low level through inverters 15 and 16 and diode 17 (since contact D continues to be at high level, the base of transistor 24 becomes low level through inverter 18, and is in an open state). On the other hand, the point B continues to maintain a low level (since the contact C is at a low level, the base of the transistor 25 is at a low level and is in an open state). Therefore, since both point A and point B are at low level, the servo motor 8
Both output terminals 21A of the microcomputer 21,
Rotation is controlled by a water flow control signal inputted to the driver IC 20 via the inverters 22 and 23 from the water heater 21B, and excessive outflow of the water heater 2 is prevented.

Furthermore, in this state (the combustion signal input terminal 11 is at a high level and the output of the microcomputer 12 of the water flow control circuit 10 is at a high level), when a low level water flow stop signal is output from the microcomputer 12, the point A is reached. The potential of the transistor 24 becomes a low level because the contact C continues to be at a low level and the base of the transistor 24 goes to a high level and becomes conductive and grounded. On the other hand, the potential at point B is 3
The transistor 25 is set to a high level by the three inverters 13, 14, and 18 (the base of the transistor 25 is set to a low level and is in an open state). Therefore, the servo motor 8 is driven to rotate in the closing direction regardless of the output signal from the microcomputer 21, and water flow to the water heater 2 is stopped.

<Effects> The present invention has the above configuration and operation, and according to the multiple water heater parallel operation type water heater described in the claims, the servo motor 8 of the water volume adjustment section of at least one water heater is Since the water flow control circuit 10 is provided in addition to the outflow prevention circuit, the water flow control section, which conventionally functioned only as an overflow prevention mechanism, can also have a water flow control function and a water flow stop control function. As a result, it is possible to eliminate the need for a solenoid valve that was conventionally necessary, and the cost can be reduced by reducing the number of parts, and since no installation space is required, the entire device can be downsized.

[Brief explanation of drawings]

Fig. 1 is an electrical wiring diagram of one embodiment of the present invention, Fig. 2 is an electrical wiring diagram of an embodiment of the present invention;
The figure is a schematic diagram of the configuration, and FIG. 3 is a schematic diagram of the conventional device. 1, 2: water heater, 3, 4: water volume adjustment section, 8: servo motor, 9: overflow prevention circuit, 10: water flow control circuit.

Claims (1)

[Claims] 1 A plurality of water heaters in which a plurality of water heaters 1 and 2 each equipped with a water volume adjustment section 3 and 4 whose water volume is adjusted by the opening/closing operation of a servo motor for water volume adjustment are arranged side by side, and each of these water heaters 1 and 2 is operated in parallel. In the parallel operation type water heater, a water volume control signal is sent to the water volume regulating servo motor 8 of at least one water heater 2 to prevent an excessive amount of water from flowing into the water heater that would prevent the hot water temperature from rising. In addition to the overflow prevention circuit that controls the servo motor for adjusting the amount of water, there is also a water flow control circuit 10 that controls the servo motor 8 to supply and stop water flow to the water heater 2, and When the combustion signal for the water heater 2 is not input, the control circuit 10 controls the servo motor 8 using a water flow signal and a water flow stop signal, giving priority to the water flow control signal from the overflow prevention circuit 9. When a combustion signal for the water heater 2 is input, priority is given to the water flow control signal from the overflow prevention circuit 9, and when a water flow stop signal is input, the water flow stop signal is used to control the water flow. A multiple water heater parallel operation type water heater characterized by being configured to give priority to signals.