JPH0765754B2 - Control method for combined combustion device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a composite combustion device such as a bathtub having a hot water supply function and a heating function.

[0002]

2. Description of the Related Art Conventionally, there is provided a heating kettle having a heating function and a bath heating circuit which are connected to a heating circuit having a heat exchanger and a circulation pump through a switching valve, and a heating circuit dedicated to hot water supply. There is known a composite combustion device such as a hot water bath / bath pot with a heating function incorporated in a single casing.

[0003]

In such a composite combustion apparatus, since the hot water supply function has recently been required to have a large capacity, the combustor used in the water heater tends to have a large combustion capacity. , For example, some combustors for hot water heaters have a maximum combustion capacity of 59,800 kcal / h, and some combustors for heating bath kettles have a maximum combustion capacity of 14,800 kcal / h. Then, the total amount of combustion exceeds 60,000 kcal / h.

However, the gas combustion equipment is classified into "household gas combustion equipment" and "commercial gas combustion equipment" according to the maximum input, that is, the value of the maximum combustion amount.
The maximum input of "household gas combustion equipment" is 60,000 kcal
If the maximum input exceeds 60,000 kcal / h below / h, it is regarded as a "commercial gas combustion device" .As mentioned above, the conventional combined combustion device burns at the time of simultaneous use of hot water supply and heating or bath. Is over 60,000 kcal / h and will be classified as "commercial gas combustion equipment", and there is a problem that there are various legal restrictions.To solve this problem, Maximum burning capacity is 45,0
If it is reduced to 00 kcal / h, it is classified as "household gas combustion equipment", but there was a problem that the large hot water supply capacity desired by the user could not be obtained when using the hot water alone.

The object of the present invention is to burn up to a maximum combustion amount of 60,000 kcal / h when the hot water is used alone, and the total combustion amount is 60,000 kcal / h or less when the hot water is used simultaneously with heating or a bath. It is intended to provide a method for controlling a composite combustion apparatus, which is classified as "household gas combustion equipment" and is suitable for use in general households.

[0006]

In order to achieve the above object, a method for controlling a composite combustion apparatus according to the present invention comprises a heating side heater to which at least a heating circuit is connected and a hot water supply circuit, and the maximum combustion of the combustor. In a combined combustion device that incorporates a hot water heater with a maximum capacity of 60,000 kcal / h in the same casing, prioritizing heating when using the hot water supply function and the heating function simultaneously, and burning the heating side heater Quantity 2
The maximum hot water supply capacity (number) of the hot water heater corresponding to each output range of the heating side heater is determined, that is, the combustion amount of the heating side heater and the hot water heater is divided. The maximum combustion amount of the heater for hot water supply that corresponds to the output range of the heater on the heating side is determined within the range in which the total of 60,000 kcal / h does not exceed 60,000 kcal / h. It is possible to demonstrate a large hot water supply capability, and when using hot water and heating at the same time, the total combustion amount is suppressed to 60,000 kcal / h or less, and it is classified as a "household gas combustion device" It can be used.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of a composite combustion apparatus equipped with a first water heater 1 for heating and a second heater 100 for hot water supply to which the present invention is applied. Maximum combustion capacity up to 15,000 kcal / h (in this example, minimum combustion capacity
3,000kcal / h, maximum combustion capacity 14,800kcal / h), heat exchanger 2 and burner 3 below it.
And a combustion fan 4, a spark plug 191 and a frame rod 192 are provided above the burner 3, and the heat exchanger 2 has a heating high temperature sensor 14 and a high limit switch 15. The provided hot water outlet passage 21 is connected to a water inlet passage 22 in which the circulation pump 5 and the heating low temperature sensor 20 are arranged.

A heating return pipe 72 is connected to the water inlet 22 via an expansion tank 8 having a water level detection electrode 81, and the hot water outlet 21 is branched into a heating hot water outlet pipe 23 and a circulation heating pipe line 24. The heating hot water outlet pipe 23 is connected to the heating outward pipe (not shown), and the circulation heating pipe 24 communicates with the heating return pipe 72 through the inner cylinder of the bath heater 93 and the bath thermal valve 25. Has been done. Further, the expansion tank 8 is connected to a replenishment water supply pipe 206, and the replenishment water supply pipe 206 is provided with an automatic water replenishment solenoid valve 80.

A bath return pipe 92 having a bath temperature sensor 11 from the bath 10 is connected to the lower end of the outer cylinder of the bath heater 93, and the upper end of the outer cylinder of the bath heater 93 is connected by a pipe 94 to the flow of the three-way switching valve 6. A pipe 95 connected to the inlet side and connected to the outlet side of the three-way switching valve 6 is connected to a bath return pipe 92 via a bypass pipe having a check valve 99, while a circulation pump 96 is provided.
Also, a bath-going pipe line 91 having a bath-water switch 97 is connected.

A drop hot water supply pipe line 205 is connected to the other inlet side of the three-way switching valve 6, and the drop hot water supply pipe line 20 is connected.
5 is a water flow sensor 21 that drops through the backflow prevention device 50.
3 is connected to the drop-out tap line 204 having
The drop-out tap line 204 is the tap line 202 of the heater 100.
It has been branched from.

The backflow prevention device 50 includes a drop solenoid valve 501 and a check valve 502 connected to the drop discharge pipe line 204.
And a drainage solenoid valve 503 from the hopper, and a check valve
A drain 502 and a drain solenoid valve 503 are connected to the hot water supply pipe line 205.

The second heater 100 has a maximum combustion capacity of 6
It is set to 0,000 kcal / h (59,800 kcal / h in this embodiment), has a heat exchanger 200, a burner 300 and a combustion fan 40 arranged below the heat exchanger 200, and A spark plug 219 and a frame rod 229 are provided above the heat exchanger 200, and the heat exchanger 200 is provided with an inlet water temperature sensor 208 for detecting an inlet water temperature T _C and an inlet water amount sensor 209. , A high limit switch 210, a temperature fuse 211, and a hot water temperature sensor 212 are provided, and a hot water outlet pipe 202 extending to the hot water supply location is connected to the hot water inlet pipe 201 and the hot water outlet pipe 202. It is connected by a bypass line 207 equipped with a valve.

The burner 3 of the first heater 1 has a capacity switching valve 31 and is connected to a main solenoid valve 36 provided in the gas main pipe 30 via a proportional control valve 32 and a solenoid valve 33 by a gas line 37. The burner 300 of the second heater 100 is in communication with each other and the capacity switching valves 301, 3
02, and is connected to the original solenoid valve 36 via the proportional control valve 35 and the solenoid valve 34 by the gas pipeline 303.

Next, the operation will be described. In the heating operation, the bath thermal valve 25 is closed, and the arrow F ₁
As shown by, the low temperature water returned from the radiator (not shown) is sent from the heating return pipe 72, the expansion tank 8 and the circulation pump 5 to the heat exchanger 2 from the water inlet 22 to be heated. The high-temperature hot water is discharged from the hot water discharge passage 21 through the hot water discharge hot water supply pipeline 23 to the heating forward hot pipeline, and is sent to the radiator.

As shown by the arrow F ₂ , during the reheating operation of the bath, the three-way switching valve 6 is connected to the pipe 94 and the pipe 94.
Switched to communicate with 95, bath return conduit 92
From the bath heater 93, the pipe 94, the three-way switching valve 6, the pipe 95, the circulation pump 96, the bath water switch 97, and the bath outgoing pipe 91, a circulation heating circuit is formed, and the bath thermal valve 25 is opened. he high temperature hot water circulation heating pipe 24 by the flow (see arrow F _5),
The bath heater 93 heats the low-temperature water from the bath return conduit 92.

During the operation of dropping into the bathtub 10, the drop solenoid valve 501 of the backflow prevention device 50 is opened, and at the same time, the three-way switching valve 6 is switched so as to connect the drop hot water supply pipe 205 and the pipe 95. Hot water outlet of heater 100
202 hot water conduit 204 darken branching from the backflow prevention device 50 (see the arrow F _3), hot water conduit 205 darken, three-way switching valve 6, the conduit 95, tub from the bath return line 92 via the check valve 99 is hot water at 10 (see arrow F _4).

Also, during normal hot water supply, a backflow prevention device 50
The drop solenoid valve 501 is closed, and hot water is discharged from the hot water supply pipe line 202 of the second heater 100 to an arbitrary hot water supply place.

Next, the control operation according to the present invention will be described with reference to FIG.
With reference to, the heating operation is not performed and only the second heater 100 is operated when the hot water is used alone, and the maximum combustion. It is possible to burn up to a power limit of 59,800 kcal / h, and set the maximum hot water supply capacity to No. 32.

When only the first heater 1 on the heating operation side is operated without hot water supply operation, the upper limit of the combustion amount of the first heater 1 is set to 14,800 kcal / h (maximum combustion capacity). .

In the simultaneous use of the hot water supply operation and the heating operation, the heating operation is prioritized, the combustion amount required for the heating operation is divided into a plurality of stages, and the upper limit of the hot water supply capacity is associated with the combustion amount of each stage. In this embodiment, the combustion amount of the first heater 1 required for the heating operation is set as follows.
It is divided into a low combustion range from 3,000 kcal / h (minimum combustion capacity) to 7,400 kcal / h and a high combustion range from 7,400 kcal / h to 14,800 kcal / h (maximum combustion capacity), and each of them has its own combustion range. Correspondingly, the combustion capacity upper limit value E _MAX. (Kcal / h) of the second heater 100 for hot water supply is set.

In each combustion range, the second heater
In order to maintain the hot water temperature of 100 at the set temperature T _S , the amount of hot water supply Q (l / h) is adjusted by the combustion capacity upper limit value E _MAX. (Kcal / h)
And the maximum target flow rate Q _S (l / h) calculated by the following equation from the input water temperature T _C , the set temperature T _S, and the thermal efficiency η. Q _S = (E _MAX. × η) / (T _S −T _C )

Now, when the required combustion amount of the first heater 1 on the heating side is 7,400 kcal / h or less, that is, in the low combustion range (minimum combustion capacity 3,000 kcal / h to 7,400 kcal / h), the second Heater 10
By setting the combustion capacity upper limit value E _MAX. Of 0 to 52,400 kcal / h, that is, setting the maximum hot water supply capacity to 28 and adjusting the hot water supply quantity Q of the second heater 100, the hot water temperature is maintained at the set temperature T _S. is intended to, at this time of the maximum target flow rate Q _S (l / h) becomes _{Q S = (52,400kcal / h ×} η) / (T S -T C).

Further, the required combustion amount of the first heater 1 on the heating side is 7,400 kcal / h or more, that is, the high combustion range (7,400 kc
The second heater when al / h-maximum combustion capacity is 14,800 kcal / h)
The combustion capacity upper limit value E _MAX. Of 100 is 45,000 kcal / h, that is, the maximum hot water supply capacity is set to No. 24, and the hot water supply amount Q of the second heater 100 is set.
The hot water outlet temperature is maintained at the set temperature T _S by adjusting the value of the maximum target flow rate Q _S (l / h) at this time is Q _S = (45,000 kcal / h × η) / (T _S -T _C ).

[0024]

As described above, according to the method for controlling the composite combustion apparatus of the present invention, when the hot water supply function and the heating function are simultaneously used, the heating is prioritized, and the combustion amount of the heating side heater is set to a plurality of output ranges of 2 or more. Corresponding to the output range of the heating side heater, it corresponds to the output range of the heating side heater within the range where the total combustion amount of the heating side heater and the hot water heater does not exceed 60,000 kcal / h The maximum combustion amount of the hot water heater is set to 60,000 when the hot water alone is used.
It is possible to burn up to kcal / h and exert a large hot water supply capacity, and when using both hot water and heating simultaneously, the total amount of combustion is suppressed to 60,000 kcal / h or less, making it a "household gas combustion device".
It is classified as and can be used in general households.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a composite combustion apparatus to which the present invention is applied.

FIG. 2 is a flowchart of a control method of the present invention.

[Explanation of symbols]

 1 Heating-side first heater 2 Heat exchanger 21 Hot water passage 22 Hot water inlet 100 Hot water supply second heater 200 Heat exchanger 201 Hot water inlet 202 Hot water outlet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Asahi, 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Stock company Noritsu (72) Inventor Hideyuki Ogasawara 32 Akashi-cho, Chuo-ku, Kobe, Hyogo Stock society Company Noritsu

Claims (1)

[Claims] 1. A heating-side heater to which at least a heating circuit is connected and a hot-water supply circuit to which the maximum combustion capacity of the combustor is set to a maximum of 60,000 kcal / h are incorporated in the same casing. In the combined combustion device consisting of the above, when the hot water supply function and the heating function are simultaneously used, the heating is prioritized, and the combustion amount of the heating side heater is divided into a plurality of output ranges of 2 or more, and the output range of each heating side heater is divided. A method for controlling a combined combustion device, wherein the maximum hot water supply capacity (number) of the hot water heater corresponding to the above is determined.