JP2604790B2 - Operation control method of articulated water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention connects two hot water heaters, and operates only one of the hot water heaters when the amount of hot water is small and the number of hot water is low, so that the amount of hot water is reduced. The present invention relates to an operation control method of a combined water heater in which both hot water heaters are operated to supply hot water when the number is at most high.

[Conventional technology]

FIG. 8 is an explanatory view showing a configuration of a connection type water heater. In this figure, reference numerals 100 and 200 denote first and second water heaters having hot water supply capacities from No. 3.5 to No. 16, respectively. Therefore, burners 1A and 1B have solenoid valves 2A and 2B and proportional valves 3A and 3A, respectively. 3B
, And is controlled by a microcomputer control unit described later. 4A and 4B are heat exchangers, and 5A and 5B are fans. Further, water supply sensors 6A and 6B and water governors 7A and 7B of variable water temperature are mounted on the water supply side of the water heater, and the thermistor 8 detects the water supply temperature. Further, the thermistors 9A and 9B are attached to the tapping pipes of the first water heater 100 and the second water heater 200, respectively, to detect the tapping temperature, respectively, and the tapping pipe of the first water heater 100 is A hot water tap (mixed water washing) 11 is connected via a hot water supply pipe 10, and a tapping pipe of the second water heater 200 is connected to a tapping pipe of the first water heater 100 via a water switching valve 12. 13 is a thermistor for detecting the temperature of hot water supplied from the hot water supply pipe 10, 14
Is a remote controller, and 15 is a microcomputer control unit, which controls based on the detection values of the thermistors and the water level sensors so that the hot water and the hot water set by the remote controller 14 can be obtained. In addition, the water governors 7A and 7B of the above-mentioned variable water temperature are provided with a constant temperature, for example,
In order to obtain hot water, for example, control is performed at about 7 / min when the water temperature is 5 ° C. and about 12 / min when the water temperature is 25 ° C.

The connected water heater configured as described above has a small amount of hot water and, in the case of a low number, supplies water by closing the water switching valve 12 and operating only the first water heater 100, and the amount of hot water is large, In the case of a high number, the water switching valve 12 is opened, and the first water heater 100 and the second water heater 100 are opened.
Hot water heater 200 and hot water, and from about 3.5
Hot water supply up to 32 can be controlled.

[Problems to be solved by the invention]

However, the above-described linked water heater has a problem in that if the amount of hot water is to be increased when the set hot water temperature is low, the hot water temperature rises above a set value and a range of uncontrollable water is generated.

FIG. 9 is a diagram showing a hot water supply capacity range for explaining such a problem, in which the vertical axis represents the tapping (setting) temperature and the horizontal axis represents the tapping amount. This figure shows the case where the water temperature is 25 ° C.

In FIG. 9, the range indicated by hatching is a case where only the first water heater 100 is operated, and the range indicated by cross hatching is a case where the first and second water heaters 100 and 200 are operated, The flow rate for switching from one-unit operation to two-unit operation by opening the water switching valve 12 is set to about 10.8 / min. The flow rate at which the water switching valve 12 is opened to switch from one-unit operation to two-unit operation is limited to the amount of water at which a predetermined maximum hot water temperature can be obtained by operating only the first water heater. In the case of the two-unit water heater shown, it was set to 10.8 / min with some margin.

Now, as shown in the figure, the hot water is discharged at 38 ° C. at a rate of 8 / min (in this case, the range of one combustion unit), and then the remote controller 14 is increased so that the hot water amount is increased to 11 / min without changing the set temperature. When operated, the amount of hot water exceeds the switching flow rate of the water switching valve 12,
The water switching valve 12 opens to shift to two-unit combustion, but since the minimum number of the two units is seven, the tapping temperature rises to 41 ° C.

Thus, under the above conditions, when the temperature is 46 ° C or higher, even if the amount of hot water is changed, the amount of hot water does not change and continuous control is possible, but when the temperature is 45 ° C or lower, control is impossible. A range is created, which is not convenient for usability.

The present invention solves the problems of the prior art as described above, without changing the hot water supply device, without generating an uncontrollable range even at the time of low-temperature tapping, and continuously increasing from No. 3.5 to No. 32 in the case of the number of symbols above. It is an object of the present invention to provide a method of controlling the operation of an articulated water heater that can be controlled.

[Means for solving the problem]

The present invention, in order to achieve the object as described above, is provided with two water heaters having a hot water supply capacity from low number to high number,
The outlet pipe of the second water heater is connected to the outlet pipe of the first water heater via a water switching valve, and when within the capability range of one water heater, the water switching valve is closed to perform the first hot water supply. When only the water heater is operated and the capacity of a single water heater is exceeded, the water switch valve is opened and the first and second water heaters are operated to supply hot water. When opened, the amount of water passing through the first water heater is detected by a water amount sensor, and it is determined whether or not it is the amount of water that opens the water switching valve.
In the case of YES, the water switching valve is opened, and it is determined whether the required gas number is equal to or greater than the total number of the minimum number of the two water heaters. Water is supplied to the water heater, but only the first water heater is burned without burning,
When YES, automatic control is performed so that the first and second water heaters are burned.

[Action]

When determining whether or not the amount of water for opening the water switching valve is flowing, the conventional linked water heater operates only the first water heater when NO, and turns off the water switching valve when YES. Although the first and second water heaters were opened and the first and second water heaters were operated, the uncontrollable range as described above occurred. However, in the present invention, the water switching valve was opened and the required gas number was two. Determine whether the number is equal to or greater than the total number of the minimum number of water heaters.
In this case, water is supplied to the second water heater, but control is performed so that only the burner of the first water heater is burned without burning the burner. Is mixed with water passing through the water heater. In addition, since the water heater is originally controlled to obtain a desired hot water temperature, even when the set hot water temperature is low and the amount of hot water is increased, it is necessary to continuously control the hot water heater without causing an uncontrollable range. Can be.

[Embodiment] In the present invention, the connection type water heater shown in FIG. 8 is used as in the prior art, but the judgment and control functions in the microcomputer control unit 15 are changed.

FIG. 1 is a flowchart using the control method of the present invention.

As shown in FIG. 1, when the hot water tap 11 is opened, the water quantity is detected by the water quantity sensor 6A of the first water heater 100, and it is determined whether or not the water quantity is the water quantity for opening the water switching valve 12. If the answer is YES, the water switching valve 12 is opened, and if the answer is NO, only the first water heater 100 is operated with the water switching valve 12 closed, as in the conventional case. When the switching valve 12 is opened, it is determined whether the required gas number is equal to or greater than the minimum number of the first and second water heaters (in the case of this embodiment,
No. 3.5 + 3.5 = No. 7 or more) is added. If it is YES, the first and second water heaters are burned. If NO, the second hot water heater is burned. Water is supplied to the water heater 200, but control is performed so that only the first water heater 100 is burned without burning the burner.

Actually, since the water governor has a variable water temperature, the opening / closing set water amount is also variable and the open set water amount (Q
_ON ) is when the water amount (Q ₁ ) detected by the water amount sensor 6A exceeds the value of the expression (1), and the closed set water amount (Q _OFF ) is the water amount (Q ₁ ) detected by the water amount sensor 6B. And when the sum of the water amount (Q ₂ ) detected by the water amount sensor 6B becomes equal to or less than the value of the expression (2).

Open set water volume (Q _ON ) ≥ No. 15 capability (15 x 25 ° C = 375) ÷ (60-T ₀ ) ... (1) T ₀ is the water temperature detected by the thermistor 8 Closed water volume set (Q _OFF ) ≤ Capability of No. 15 (15 × 25 ° C. = 375) ÷ (60−T ₀ ) −1 (2) This is shown in FIG. 6 to prevent hunting.

Similarly, in the case of this embodiment, the minimum number of gases when the two units are burned is 7, but the number of gases required to burn or extinguish the second water heater is as follows in consideration of hunting. I do.

Number of required gas (G _ON ) ≧ 9 Number of required fire extinguishing gas (G _OFF ) ≦ 8 The required number of gas (G) is calculated by the following formula.

(A) water switching valve opens when required gas scale number (G) = (T-T 0) × Q 1 ÷ 25 (b) requires the gas scale number for water switching valve is in the closed (G) = (T- T ₀ ) × (Q ₁ + Q ₂ ) ÷ 25 where T is the temperature set in the microcomputer. This is shown in FIG. 7 as shown in FIG. With the control as described above, when the amount of water for opening the water switching valve 12 is not flowing, only the first supply device 100 is operated as shown in FIG. 2, and the amount of water for opening the water switching valve flows. However, if the required gas number is less than the total number of the minimum number of the two water heaters, the water switching valve 12 is opened as shown in FIG. The water passing through the second water heater 200 is mixed with the hot water obtained by the first water heater without burning the water, and the required gas number is required even if the amount of water for opening the water switching valve 12 is flowing. Only when the number is equal to or greater than the total number of the minimum numbers of the two water heaters, the first and second water heaters are operated as shown in FIG. 4 to supply hot water.

In any of the above cases, the hot water supply temperature is detected by the thermistor 13, and if there is a difference from the set temperature, the comparison control valve is controlled to adjust the gas amount. It is a matter of course that the amount of hot water and the amount of hot water set in the remote controller 14 are supplied by detecting the amount of water by the sensors 6A and 6B and the like.

The hot water supply range when hot water is supplied as shown in FIGS. 2 to 4 is as shown in FIG. 5, and can be continuously controlled in any case.

〔The invention's effect〕

As described above, according to the present invention, in a water heater in which two variable capacity water heaters from a low number to a high number are connected, even if the amount of hot water is increased when the set hot water temperature is low, There is an effect that continuous control can be performed without any uncontrollable range unlike the related art, and operability can be improved.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a control method according to the present invention;
FIG. 2 is an explanatory view of a state in which only the water heater of FIG. 1 is operated, and FIG. 3 is a state in which water flows into the second water heater but is not burned, and only the first water heater is operated. FIG. 4 is an explanatory diagram of a state, FIG. 4 is an explanatory diagram of a state in which a first water heater and a second water heater are operating, and FIG. 5 is a diagram showing a relationship between operation of the water heater and hot water temperature and water amount. , FIG. 6 is a diagram showing the relationship between the opening and closing of the water switching valve and the amount of water, FIG. 7 is a diagram showing the relationship between the number of gas and the transition between single-unit combustion and two-unit combustion, and FIG. FIG. 9 is a diagram showing the relationship between the hot water temperature and the amount of water for explaining the uncontrollable range according to the conventional method. 1A, 1B… Burner, 2A, 2B… Solenoid valve, 3A, 3B… Proportional valve, 4A, 4B… Heat exchanger, 5A, 5B… Fan, 6A, 6B…
Water volume sensor, 7A, 7B …… Water temperature variable water governor, 8,9A, 9B, 1
3 ... Thermistor, 10 ... Hot water pipe, 11 ... Hot tap, 12 ...
… Water switching valve, 14… remote control, 15… microcomputer control unit,
100 ... first water heater, 200 ... second water heater.

Claims (3)

(57) [Claims] 1. A hot water supply device having two hot water supply capacities ranging from a low water number to a high water number is provided in parallel, and a water switching valve is connected to a water supply pipe of a second water heater to a water supply pipe of the first water heater. The water switching valve is closed to operate only the first water heater when the capacity is within the capacity range of one water heater, and the water switching valve is opened when the capacity of one water heater is exceeded. When the hot water tap is opened, the amount of water passing through the first water heater is detected by a water amount sensor when the first and second water heaters are operated to supply water from both water heaters. , It is determined whether it is the amount of water to open the water switching valve, and if YES, the water switching valve is opened and the required gas number is the total number of the minimum number of 2 water heaters It is determined whether the number is equal to or greater than the number. If the answer is NO, water is supplied to the second water heater but the first water heater is not burned. It burned himself, If YES, the operation control method of the articulated water heater, characterized by automatic control as allowed to burn the first and second water heater. 2. The method according to claim 1, wherein the set water amount for closing the water switching valve is lower than the set water amount for opening the water switching valve. 3. The number of gases required for extinguishing when shifting from two-burning to one-burning is lower than the number of gases required for burning when shifting from one-burning to two-burning. Operation control method of the linked water heater.