JP3630279B2 - Control method for hot water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for controlling a thermal valve that opens and closes a hot water circulation path in a hot water heating apparatus.
[0002]
[Prior art]
Conventionally, in a hot water heating apparatus, when a heating operation request signal is transmitted from a heating terminal, the hot water heating heat source unit starts heating combustion, heats the circulating water for heating, operates the circulation pump, and heats the hot water Circulate to the circulation circuit. The heating terminal arranged in the living room heats the living room with the circulated hot water. At this time, in a heating apparatus in which a plurality of heating terminals are arranged, a thermal valve is arranged for each heating terminal, and heating / warming water is distributed by controlling opening / closing of the thermal valves. .
[0003]
The thermal valve is always energized and kept open while the heating terminal transmits a heating operation request. In other words, the thermal valve always consumes electric power during the heating operation request. The power consumption of the thermal valve is about 5 W / h per unit, and is considerably large in a heating apparatus having about 10 heating systems. Also, the heating operation is generally operated for a long time from several hours to all day, and the power consumed by the thermal valve is very wasteful considering that it is not supplied to the heating. It can be said that it is electric power.
[0004]
[Problems to be solved by the invention]
In view of the above problems, an object of the present invention is to provide a method for controlling a thermal valve that minimizes wasteful power consumption in the thermal valve during heating operation.
[0005]
[Means for Solving the Problems]
A hot water heating device in which a circulation path for circulating hot water for heating, a heat source for hot water heating, and a hot water heating terminal for heating by circulation of hot water are connected in the circulation path, the hot water heating terminal In the control method of the hot water heating apparatus that controls the circulation of hot water by opening and closing the thermal valve provided in the circulation path according to the heating operation request of the heater, the energization to the thermal valve is performed while the heating operation request is transmitted Is turned OFF after the time required for the valve opening of the thermal valve to fully open, and then turned OFF. after waiting, is oN, OFF with left Jo Tokoro intervals kept the heat valve operating in an open state so as to repeat that is oN for the time necessary to fully open the valve opening again, Netsudoben While keeping the air open Reducing the power consumption in the thermally activated valve in.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing a configuration of a hot water heater according to the present invention.
Reference numeral 1 denotes a heat source machine for hot water heating. The hot water heating heat source machine 1 is provided with a hot water circulation path 2, and in the hot water circulation path 2, an open-air tank 3 for storing heating hot water and a circulation pump 4 for circulating the heating hot water. And the heat exchanger 5 for heating the hot water for heating are arranged in order from the upstream side.
[0007]
Reference numerals 6 and 16 denote hot water heating terminals. Each of the hot water heating terminals 6 and 16 is provided with an operation switch 7, and a signal of the operation switch 7 is connected to the hot water heating heat source unit 1 by a signal line 8. Moreover, the hot water heating terminals 6 and 16 are connected to the hot water heating heat source 1 by the hot water circulation path 2 to form a hot water heating circuit.
[0008]
Between the hot water heating terminals 6 and 16 and the hot water heating source 1, thermal valves 9 and 19 are arranged on the outgoing side of the hot water circulation path 2 for each hot water heating terminal. The opening and closing operation of the thermal valves 9 and 19 is performed by energization from the heat source unit 1 for hot water heating.
[0009]
Here, the operation principle of the thermal valve will be described with reference to FIGS.
FIG. 3 shows the internal structure of the thermal valve. In the closed state, the valve body 24 is closed by the repulsive force of the valve spring 25. When the valve 21 is opened, the heater 21 is energized, so that the thermo pellet 22 is warmed, and the wax enclosed in the thermo pellet 22 expands to push down the insulating shaft 26 and the shaft 23. As a result, the valve body 24 crushes the valve spring 25 to secure a flow path. When the valve is closed again, the heater 21 is de-energized, the thermo pellet 22 is cooled, the wax inside is contracted, the valve spring 24 is closed by the repulsive force of the valve spring 25, and the flow path is shut off. The
[0010]
FIG. 4 is a diagram showing the relationship between the valve opening degree and the flow rate.
The relationship between the valve opening and the flow rate is not proportional as shown in FIG. This means that if the valve body is opened to some extent, it will not affect the flow rate even if it opens further. In the present invention, using the range that does not affect the flow rate shown in FIG. 4, the energization is turned on and off while the thermal valve is kept open.
[0011]
The operation of the present invention will be described with reference to FIG.
When the operation switch 7 of the hot water heating terminal 6 is turned on (S1), it is transmitted to the hot water heating heat source unit 1 via the signal line 8 and the circulation pump 4 is activated (S2) to circulate the hot water and heat it. Combustion begins (S3).
[0012]
Here, the heater 21 of the thermal valve 9 is energized (S4), and the thermal valve 9 is opened by driving the valve body 24 in the thermal valve 9 by the expansion of the thermo pellet 22 warmed by the heater 21. It is.
[0013]
In order for the thermal valve 9 to be fully opened, the thermo pellet 22 must be sufficiently warmed by the heater 21, and therefore, first, a predetermined time T 0 (the thermal valve 9 is turned on) from the start of energization of the thermal valve 9. The energization of the thermal valve 9 is continued for a sufficient time to fully open (for example, 5 minutes) (S5).
[0014]
After the predetermined time T0 has elapsed, the energization of the thermal valve 9 is stopped (S6). Here, even if the energization of the thermal valve 9 is stopped, the flow rate of the hot water flowing through the hot water circulation path 2 does not change immediately. This is because it takes time for the temperature of the thermopellet 22 in the thermal valve 9 to decrease, and as described above, there is a range in which the valve opening does not affect the flow rate.
[0015]
After waiting for a predetermined time T1 (a time during which the decrease in the valve opening does not affect the flow rate, for example, 1 minute) (S7), the thermal valve 9 is energized again (S8). Then, energization is continued for a predetermined time T2 (a time sufficient for the thermal valve opening to be fully opened, eg, 1 minute) (S9). Here, since T2 is affected by the residual heat at the start of heating and the hot water for heating, a shorter time may be set as compared with T0.
[0016]
Then, it returns to step S6 and repeats step S6 to step S9 during heating operation. Thereby, the electric power consumed by the thermal valve during the heating operation is suppressed to about half.
[0017]
The above shows a preferred example of the present invention and is not limited to the above. For example, the predetermined time shown above can be made variable according to changes in operating conditions such as ambient temperature, heating hot water temperature, and operating conditions of other thermal valves.
[0018]
【The invention's effect】
As described above, since the open / close state of the thermal valve changes depending on the internal temperature, it takes time to open and close. Further, there is a range in which the valve opening does not affect the flow rate. Utilizing this, the power consumed by the thermal valve is reduced while keeping the thermal valve open by turning the energization of the thermal valve during heating operation on and off at predetermined time intervals. Can be made.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a hot water heating apparatus of the present invention. FIG. 2 is a sequence diagram showing a control method of the hot water heating apparatus of the present invention. State diagram [Fig. 4] Diagram showing the relationship between valve opening and flow rate of the thermal valve of the present invention [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat source machine for hot water heating 2 Hot water circuit 4 Pump 6 Terminal for hot water heating 7 Operation switch 9 Thermal valve 21 Heater 22 Thermo pellet 24 Valve body 25 Valve spring

Claims (1)

A hot water heating apparatus in which a circulation path for circulating hot water for heating, a heat source for hot water heating, and a hot water heating terminal for heating by circulation of hot water are connected in the circulation path, and the hot water heating In the control method of the hot water heating apparatus that controls the circulation of hot water by opening and closing the thermal valve provided in the circulation path according to the heating operation request of the terminal for the heating, while the heating operation request is transmitted, the heat The energization of the valve is turned off after the time required for the valve opening of the thermal valve to fully open is turned off, and the time during which the decrease in the valve opening due to the power off does not affect the flow rate only after waiting at OFF state, make it oN, OFF with left Jo Tokoro intervals kept the heat valve operating to repeat that is oN for the time required for the open state to fully open said valve opening again Temperature characterized by Method of controlling the heating apparatus.

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