JPS647290B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention includes a capacity switching device that can freely switch the heating capacity of a water heat exchanger into at least two stages, strong and weak, and a flow rate control device that adjusts the amount of water flowing through the water heat exchanger in conjunction with a hot water temperature adjustment knob. The present invention relates to a hot water temperature regulating device in a capacity switching type instantaneous water heater. Originally, in this type of water heater, if you set the water temperature control knob to the high temperature side and switch the capacity from "weak" to "strong" while reducing the water flow rate, boiling phenomenon will occur in the water heat exchanger. In order to prevent this, a stopper piece that is linked to the capacity switching operation can freely regulate the operation limit of the hot water temperature control knob to the position that obtains the minimum water amount that corresponds to the capacity ``strong''.
It is known from the publication No. However, with this type, if the hot water temperature adjustment knob is in the same operating position, the amount of water flowing through is kept constant regardless of the capacity, so the hot water temperature changes greatly when the capacity is changed, and the hot water temperature adjustment knob is not adjusted. This has the disadvantage that it is difficult to set a guideline for temperature regulation. The present invention has been proposed in order to eliminate such inconveniences, and includes a capacity switching device that can freely switch the heating capacity of a water heat exchanger into at least two stages, strong and weak, and a water heat exchanger that is connected to a hot water temperature adjustment knob. and a flow rate control device for adjusting the amount of water flowing through the water temperature control knob, the flow rate switching device having a built-in flow rate switching means that can freely switch and adjust the set water flow rate at each operation position of the hot water temperature adjustment knob into at least two levels, large and small. , characterized in that the flow rate switching means is switched in conjunction with the switching operation of the capacity switching device. Next, one example of the embodiment of the present invention will be explained with reference to the attached drawings. In the drawing, reference numeral 1 denotes a water heat exchanger that heats water from a water supply pipe 2 on the inflow side and supplies it to a hot water outlet pipe 3 on the outflow side. It is now possible to switch between multiple levels of strength. To explain this in more detail, the water heat exchanger 1 is equipped with a pair of burners 5 and 6 of small capacity and large capacity on the lower side, and the capacity switching device 4 is configured to control the gas of the small burner 5. The first solenoid valve on the upstream side that intervenes in the supply path
V <sub>1</sub> , a second solenoid valve V <sub>2</sub> parallel to the orifice 7 downstream thereof, a third solenoid valve V <sub>3</sub> intervening in the gas supply path of the large burner 6, and both of these solenoid valves V <sub>1</sub> , V <sub>2</sub> , and V <sub>3</sub> . It is composed of a common solenoid valve <sub>V0</sub> for the burners 5 and 6, and a control circuit 8 shown in the third figure that controls opening and closing, and "weak", "medium",
It is operated in the following manner in conjunction with the capacity switching knob 10 which can be freely switched between 4 positions, ``Strong'' and ``Extra Large''. First, according to the water flow in the "weak" position, the water supply pipe 2
The water pressure switch 1 is activated by the water governor 11 interposed in the
2 is closed to open the original solenoid valve V ₀ and the first solenoid valve V ₁ , a small amount of gas is supplied to the small burner 5 through the orifice 7, and then in the "medium" position, the capacity switching The first relay _R1 is energized by the capacity changeover switch 13 linked to the knob 10, and the second solenoid valve _V2 is opened by closing the first relay contact r1, so that a relatively large amount _of water is supplied to the small burner 5. When gas is supplied and in the "strong" position, the second relay R2 is energized instead of the first relay _R1 by the capacity selector switch 13, and the _third solenoid valve is closed by closing the second relay contact _R2 .
V ₃ is opened, a small amount of gas is supplied to the small burner 5, and at the same time gas is supplied to the large burner 6. Furthermore, in the "extra large" position, the capacity selector switch 13 switches between the second and third burners. Relays R ₂ and R ₃ are energized,
The second and third relays by closing the second and third relay contacts r ₂ and r ₃
Given the opening of solenoid valves V ₂ and V ₃ , the small burner 5
A relatively large amount of gas is supplied to the large burner 6, and a relatively large amount of gas is supplied to the large burner 6. The above operations can be summarized as shown in the table below.

[Table] In the drawing, reference numeral 14 indicates a hot water temperature adjustment knob disposed on the operation panel 9, and a flow rate control device 15 linked to the knob 14 adjusts the amount of water flowing to the water heat exchanger 1 to adjust the hot water temperature. Further, according to the present invention, the flow rate control device 15 includes the hot water temperature adjustment knob 1.
A flow rate switching means 16 is incorporated which can freely switch and adjust the set water flow rate at each operating position of 4 in at least two stages, large and small.
The switching operation is linked to the switching operation. Note that the capacity difference between "weak" and "medium" and the capacity difference between "strong" and "extra-large" in the illustrated capacity switching device 4 are relatively small differences depending on the amount of gas supplied to the small burner 5. The capacity is roughly divided into two ranges: a weak range of "weak" and "medium" and a strong range of "strong" and "extra-large", and the flow rate switching means 16 is a two-stage switching device as described later. A switching operation is applied to the flow rate switching means 16 by switching to a different range. To explain this in detail below, the flow rate control device 15:
an electric flow control valve 17 interposed in the water supply pipe 2;
The control circuit 19 is composed of a first volume 20 that is linked to the hot water temperature adjustment knob 14 as shown in the third diagram, and a rotation angle detection device that is gear-engaged with the motor 18. A bridge circuit 22 in which a second volume 21 is interposed, and arithmetic amplifiers 23, 2 for forward rotation and reverse rotation on the output side thereof.
3, the control valve 17 operates to give the motor 18 a rotation angle corresponding to the resistance value of the first volume 20 set by operating the knob 14. The opening degree is controlled to correspond to the operating position. The flow rate switching means 16 connects the bridge circuit 22 with the first
Two first and second resistors 24 and 25 having different resistance values are connected to the switching element 2 in parallel with the volume 20.
6 and 27, and the control valve 17 is controlled to a relatively small opening degree in accordance with the combined resistance value of the first resistor 24 and the first regulator 20. The control valve 17 is adjusted in accordance with the setting state and the combined resistance value of the second resistor 25 and the first regulator 20.
It is possible to freely switch between a large water flow setting state where the opening is controlled to a relatively large opening. The switching elements 26 and 27 are controlled ON and OFF by the above-mentioned capacity changeover switch 13 which interlocks the capacity changeover knob 10. That is, in the small capacity range where the capacity selector switch 13 is set to "weak" or "medium", the potential at the connection point A becomes high due to the power supply voltage, and the first resistor 24
At the same time, the first switching element 26 is turned on, and the third switching element 28 is turned on, and the potential at the connection point B becomes a low potential of approximately ground potential through the third switching element 28, and the second resistor is turned on. In the large capacity range where the second switching element 27 for 25 is turned OFF and the capacity selector switch 13 is set to "strong" or "extra large", the potential at the connection point A is changed to approximately the ground potential via the capacity selector switch 13. As the potential changes, the first switching element 26 is turned off, the third switching element 28 is turned off, and the potential at the connection point B becomes high due to the power supply voltage, so that the second switching element 27 is turned on. I made it. Thus, in the small capacity range, the water flow rate is adjusted at the small setting shown by line a in Figure 4, and in the large capacity range, the water flow rate is adjusted at the 4th setting.
The amount of water flow can be adjusted in the large setting state shown by line b in the figure. Figure 5 shows the relationship between water flow rate and hot water temperature, a
The line shows the characteristics in the small capacity range, and the b line shows the characteristics in the large capacity range. In the conventional system, if the capacity is changed with the hot water temperature control knob at the same operating position, the hot water supply state changes from, for example, point A on line A to line B at the same water flow rate.
It moves to point B′, and the temperature of the hot water changes greatly,
According to the present invention, even if the hot water temperature adjustment knob 14 is kept at the same operating position, the water flow rate is switched between large and small as described above in conjunction with the capacity switching operation, and thus the hot water supply state shifts from point A to point B. Changes in hot water temperature are regulated as narrowly as possible. Note that the flow rate switching means 16 is not limited to the one in the above embodiment, and for example, a flow rate control valve 17 in the water supply channel 2 may be used.
A flow rate switching valve may be provided in series with the flow rate switching valve, and the switching operation may be performed in conjunction with the capacity switching operation. As described above, according to the present invention, the water flow rate is adjusted to be large or small while keeping the hot water temperature adjustment knob at the same operating position in conjunction with the capacity switching operation, so that the hot water outlet temperature changes as the capacity changes. is regulated to be as narrow as possible, which has the effect of making it easier to gauge the water temperature adjustment using the water temperature adjustment knob and making the operation easier.

[Brief explanation of drawings]

Fig. 1 is a diagram of a water heater equipped with the device of the present invention, Fig. 2 is a front view of its operation panel, Fig. 3 is a circuit diagram of an example of the device of the present invention, and Fig. 4 is a water temperature adjustment knob. FIG. 5 is a diagram showing the relationship between water flow rate and hot water temperature. 1... Water heat exchanger, 4... Capacity switching device, 14
... Hot water temperature adjustment knob, 15 ... Flow rate control device, 16
...Flow rate switching means.

Claims (1)

[Claims] 1. A water heat exchanger equipped with a capacity switching device that can freely switch the heating capacity of the water heat exchanger into at least two stages, strong and weak, and a flow rate control device that adjusts the amount of water flowing through the water heat exchanger in conjunction with a hot water temperature adjustment knob. , the flow rate control device incorporates a flow rate switching means that can freely switch and adjust the set water flow rate at each operating position of the hot water temperature adjustment knob in at least two steps, large and small, and the flow rate switching device is linked to the switching operation of the capacity switching device. 1. A hot water temperature regulating device for a capacity switching type instantaneous water heater, characterized in that the water temperature is switched between the two.