JPH0539951A - Hot water feeding device with additional boiling function - Google Patents

Abstract

PURPOSE:To prevent dew formation at an additional boiling heat exchanger even in the case that a concurrent additional boiling operation and a hot water feeding operation are carried out at a hot water feeding device having an additional boiling function for use in adjusting an amount of combustion with a proportional valve which is common for an additional boiling operation and a hot water feeding operation. CONSTITUTION:A microcomputer 602 to be installed in a control device 600 for a hot water feeding device 100 having an additional boiling function has a program of an additional boiling waiting function 605 in which in the case of performing a concurrent additional boiling operation and a hot water feeding operation, a concurrent combustion is carried out for one minute and after this operation, when a temperature of water flowing into an additional boiling heat exchanger 501 is less than a predetermined temperature, the additional boiling operation is stopped until the hot water feeding operation is stopped and as the hot water feeding operation is stopped, the additional boiling operation is started again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heater having a reheating function in which fuel is supplied to a hot water supply burner and a reheating burner by a common proportional valve.

[0002]

2. Description of the Related Art In order to reduce the size and thickness of a water heater with an additional heating function and to reduce the number of parts, there is one that adjusts the amount of fuel supplied to the hot water supply burner and the additional heating burner by one proportional valve. ..

[0003]

However, in this type of water heater with an additional heating function, when the additional heating operation and the hot water supplying operation are simultaneously performed, the opening of the proportional valve is controlled based on the hot water supplying operation. Therefore, the opening degree of the proportional valve becomes small, and the combustion temperature of the additional heating burner may become lower than that in the case of the additional auxiliary heating operation. In addition, in the reheating operation, if the temperature of the water flowing in the reheating heat exchanger is low and the opening of the proportional valve is small for hot water supply, dew condensation occurs in the reheating heat exchanger.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to adjust the combustion amount of a heating operation and a hot water supply operation by a common proportional valve. It is to provide a water heater with a reheating function that does not cause dew condensation on the heat exchanger.

[0005]

The water heater with a reheating function of the present invention employs the following technical means. The outline of the present invention is shown in the block diagram of FIG. Water heater with additional heating function 1
Is provided in the hot water supply burner 2, the additional heating burner 3, and the fuel supply path 4 for supplying fuel to the hot water supply burner 2 and the additional heating burner 3, and supplies fuel corresponding to the amount of electricity to each of the burners 2. 3 is provided between the proportional valve 5 and the hot water supply burner 2, and the hot water supply burner 2 is provided between the proportional valve 5 and the hot water supply burner 2.
Hot water supply opening / closing valve 6 for intermittently supplying fuel to the additional heating burner 3 and the additional heating on / off valve provided between the proportional valve 5 and the additional heating burner 3 for intermittently supplying fuel to the additional heating burner 3. 7, a hot-water supply heat exchanger 8 for exchanging heat between the heat generated in the hot-water supply burner 2 and the water supplied from the water supply port and flowing out from the hot-water supply port, and the heat generated in the reheating burner 3 and supplied from the bathtub again. The hot water heating heat exchanger 9 for exchanging heat with the water in the bath water flowing out to the bath tub, the proportional valve 5, the hot water supply opening / closing valve 6, and the hot water opening / closing valve 7 are energized to perform hot water supply and additional heating. Control device 1
With 0 and. Then, the control device 10 is provided with the additional heating operation function 11 for performing combustion in the additional heating burner 3 when the additional heating condition is satisfied, and the additional heating operation function 11 is
When performing a hot water supply operation in which the hot water supply burner 2 burns at the same time as the additional heating operation, the additional heating standby function 12 stops the additional heating operation until the hot water supply operation is stopped, and restarts the additional heating operation when the hot water supply operation is stopped. Equipped with.

As an example of a preferred embodiment, the additional heating standby function has an additional operation when the simultaneous operation of the additional heating operation and the hot water supply operation is started and the water temperature of the additional heating heat exchanger is equal to or lower than a predetermined temperature. The heating operation may be stopped, and the additional heating operation may be restarted when the hot water supply operation is stopped. In this case, in order to detect the water temperature of the additional heating heat exchanger, after the simultaneous operation is started and the simultaneous operation is performed for a predetermined time, when the water temperature is equal to or lower than a predetermined temperature, the additional heating operation is stopped and hot water is supplied. It may be provided so that the additional heating operation is restarted when the operation is stopped.

[0007]

When the additional heating operation is performed independently, the additional heating operation function of the controller causes the additional heating burner to burn at a predetermined combustion amount. Since the combustion temperature is high in the additional firing operation,
Condensation does not occur in the reheating heat exchanger even if the water temperature in the reheating heat exchanger is low. When the additional heating operation and the hot water supply operation are performed at the same time, the additional heating standby function of the control device stops the additional heating operation to perform only the hot water supply operation, and when the hot water supply operation is stopped, the additional heating operation is restarted.

[0008]

[Effects of the Invention] The water heater with a reheating function of the present invention actually performs only the hot water supply operation and does not perform the reheating operation, even if the reheating operation and the hot water supply operation are simultaneously performed. For this reason, dew condensation does not occur in the additional heating heat exchanger.

[0009]

EXAMPLE Next, the water heater with a reheating function of the present invention is shown in FIG.
A description will be given based on an example shown in FIG. [Structure of Embodiment] FIG. 2 is a schematic view of a water heater with an additional heating function showing an embodiment of the present invention. This water heater with reheating function 10
0 is the combined combustion unit 200, the fuel supply unit 300, the hot water supply pipe 400
It consists of reheating water pipe 500 and controller 600.

The composite combustion unit 200 includes a hot water supply combustion unit 201 and a reheating combustion unit 202, and the combustion chamber of the hot water supply combustion unit 201 and the combustion chamber of the reheating combustion unit 202 are provided independently of each other. .. The hot water supply / burning section 201 has two independent burners (first hot water supply burner).
203, a second hot water supply burner 204), and a large combustion width is realized by switching between single use and double use. Two burners 203 of the hot water supply and combustion section 201,
The additional burner 205 of the additional burner 204 and the additional burner 205 of the additional burner section 202 are supplied with air for combustion from a common blower 206. Also,
The combustion gas generated in the hot water supply combustion section 201 and the additional heating combustion section 202 is discharged from the common exhaust port 207. Near the first hot water supply burner 203 and the additional heating burner 205, sparkers 208 and 209 for igniting gas and frame rods 210 and 211 for detecting flames are attached, respectively.

The fuel supply unit 300 includes a first hot water supply burner 203,
A fuel supply path 301 for supplying gas is provided to the second hot water supply burner 204 and the additional heating burner 205. This fuel supply path 301
An upstream solenoid valve 302 is provided upstream of and a proportional valve 303 is provided downstream thereof. The proportional valve 303 adjusts the amount of gas passing through by changing the opening ratio according to the amount of energization. Downstream of the proportional valve 303, a fuel supply passage 301 is branched into three directions, and each is provided so as to supply gas to the first hot water supply burner 203, the second hot water supply burner 204 and the additional heating burner 205. Proportional valve 303 and first hot water supply burner 203
A first hot water supply opening / closing valve 304 for connecting and disconnecting the supply of fuel to the first hot water supply burner 203 is provided in the fuel supply path 301a connecting the two. A second hot water supply opening / closing valve 305 for connecting and disconnecting the fuel supply to the second hot water supply burner 204 is provided in a fuel supply path 301b connecting the proportional valve 303 and the second hot water supply burner 204. Proportional valve 30
A fuel supply passage 301c connecting the 3 and the additional heating burner 205 is provided with a additional heating opening / closing valve 306 for intermittently supplying the fuel to the additional heating burner 205.

The hot water supply pipe 400 has a water supply port 401 at one end and is connected to a water supply source. The other end of the hot water supply pipe 400 is a hot water outlet 402, which is connected to a pipe for supplying hot water. Hot water supply piping
In the middle of 400, there is a hot water supply heat exchanger 403 for exchanging heat generated between the first hot water supply burner 203 and the second hot water supply burner 204 with the water supplied from the water supply port 401 and flowing out from the hot water supply port 402. It is provided. A water governor 404 and a hot water supply / water flow switch 405 are provided on the upstream side of the hot water supply heat exchanger 403. In addition, downstream of the hot water supply heat exchanger 403,
A hot water temperature sensor 406 for detecting the temperature of water (hot water) that has passed through the hot water supply heat exchanger 403 is provided. Hot water temperature sensor 4
The hot water supply pipe 400 downstream of 06 is filled with heated hot water in a bath 700
A hot water pipe 407 is connected to the pipe. The downstream end of this hot water filling pipe 407 is connected to the middle of the reheating water pipe 500 (downstream side of the circulation pump 504 described later), and the water (hot water) heated by the hot water supply heat exchanger 403 is bathed. It leads to 700. A water filling solenoid valve 408, a water filling water amount sensor 409, a check valve 410, and the like are provided in the middle of the water filling pipe 407.

The reheating water pipe 500 is a pipe whose both ends open into the bath 700, and forms a water circulation path for sucking the water in the bath 700 from one end and returning it to the bath 700 again.
In the middle of the heating water pipe 500, a heating heat exchanger 501 for exchanging heat between the heat generated in the heating burner 205 and the water flowing inside the heating heat exchanger 501.
Is provided. An additional heating water flow switch 502, an additional heating temperature sensor 503, and a circulation pump 504 are provided on the upstream side of the additional heating heat exchanger 501.

The control device 600 is provided with a controller 601 operated by a user, and instructions from the controller 601, hot water supply water flow switch 405, additional heating water flow switch 502,
According to the signals from the hot water temperature sensor 406, the additional heating temperature sensor 503, the two frame rods 210 and 211, and the water amount sensor 409 for filling water, and the program of the microcomputer 602 installed in the control device 600, the blower 206 and the two The sparkers 208, 209, the original solenoid valve 302, the proportional valve 303, the first hot water supply opening / closing valve 304, the second hot water supply opening / closing valve 305, the additional heating opening / closing valve 306, the hot water filling solenoid valve 408, and the circulation pump 504 are energized to supply hot water. , Hot water filling and reheating. Proportional valve 303
The control is provided so as to give priority to the hot water supply operation so that the hot water discharge temperature desired by the user is obtained when the additional heating operation and the hot water supply operation are performed at the same time.

Next, the additional heating control by the control device 600 will be described. Controller 601, depending on the user,
A firing switch 603 is provided to give a firing instruction. When a heating instruction is given by the heating switch 603, the control device 600 heats the hot water in the bathtub 700 to a set temperature (hereinafter referred to as set temperature heating), or the hot water of the bathtub 700. A heating operation function 604 is provided for performing heating (hereinafter, referred to as forced heating) for raising the temperature from the current state. Specifically, when the additional heating switch 603 is turned on, the additional heating burner 205 performs forced additional heating to burn a predetermined amount of combustion (set to the maximum amount of combustion in the additional heating burner 205). Then, burning is performed for a predetermined time (for example, 3 minutes) for additional heating, and the additional heating operation is stopped. However, if the hot water temperature in the bathtub 700 does not reach the specified temperature even after the forced reheating operation,
The set temperature additional heating operation is performed until the temperature of the hot water in the bathtub 700 reaches a predetermined temperature. As a result, when the reheating switch 603 is turned on, when the water temperature in the bathtub 700 is low, it can be reboiled to a predetermined temperature, and even if the predetermined temperature is reached, the reheating operation is performed for a predetermined time, The hot water temperature can be increased by a predetermined temperature range (for example, about 1 °).

The additional heating function 604 is used for the additional heating operation at the same time.
When the hot water supply operation is performed and the predetermined conditions are met,
A hot-burning standby function 605 is provided to temporarily stop the hot-water heating operation, perform only the hot-water supply operation, and restart the hot-water heating operation after the hot-water supply operation is stopped. This additional heating standby function 605 is provided when the additional heating operation and the hot water supply operation are satisfied at the same time (when the hot water supply operation is started during the additional heating operation, when the additional heating operation is started during the hot water supply operation, Alternatively, when the additional heating operation and the hot water supply operation are simultaneously started, first, a predetermined time (for example, 1
Min), the hot water heating operation and the additional heating operation are performed at the same time. Then, after a lapse of a predetermined time, the additional heating heat exchanger is operated by the additional heating temperature sensor 503.
When the water temperature flowing into 501 is measured at a predetermined temperature or lower (for example, 15 ° C. or lower), the additional heating operation is stopped and the hot water supply independent operation is performed. When the hot water supply operation is stopped, the additional heating operation is restarted. The reheating after restarting this reheating operation, when the forced heating is interrupted by hot water supply, the remaining time is added, and when the set temperature reheating is interrupted by hot water supply, after reaching the set temperature, Stop burning. In the present embodiment, the circulation pump 504 is provided so as to operate even during the standby for the additional heating operation so that the water temperature in the bathtub 700 can be detected when the additional heating operation is restarted. The circulation pump 504 may be stopped during the standby for the additional heating operation in order to reduce noise and power consumption.

[Operation of Embodiment] Next, the operation of the above-described embodiment of the present invention will be briefly described. If the hot water supply operation is performed at the same time as the hot water heating operation, such as when the hot water supply instruction is given during the hot water heating operation, or when the hot water heating instruction is given during the hot water supply operation, the additional heating programmed in the microcomputer 602 of the controller 600 is performed. By the function of the heating standby function 605, first, the hot water supply operation and the additional heating operation are simultaneously performed for a predetermined time. Then, when the temperature of the water flowing into the reheating heat exchanger 501 is equal to or lower than the predetermined temperature after a predetermined time elapses, the reheating operation is stopped and the hot water supply independent operation is performed. When hot water supply is stopped, reheating operation is restarted,
The boiling water in the bathtub 700 is reheated to a predetermined temperature or the predetermined temperature range is increased.

[Effects of the Embodiment] In this embodiment, the common proportional valve 303 is used to adjust the amount of gas supplied to the reburning combustion section 202 and the hot water supply combustion section 201, thereby reducing the size or thickness and reducing the cost. Even when the hot water supply device 100 is designed, when the hot water supply operation is performed at the same time as the additional heating operation, the additional heating operation is also performed for the predetermined time at the same time as the hot water supply operation, and after the predetermined time, dew condensation occurs on the additional heat exchanger 501 When there is a possibility, stop the reheating operation and perform only the hot water supply operation. In other words, even if the reheating operation and the hot water supply operation are simultaneously performed, if dew condensation may occur in the reheating heat exchanger 501, the reheating operation is stopped and only the hot water supply operation is performed. Condensation does not occur on exchanger 501.

[Modification] In the above embodiment, when a request for simultaneous operation of the additional heating operation and the hot water supply operation is made, the additional heating operation is performed for a predetermined time, and after the predetermined time elapses, the additional heating heat exchanger is operated. Although the example of detecting the inflowing water temperature is shown, the reheating operation is not performed, only the circulation pump is operated for a predetermined time, and the water temperature flowing into the additional heating heat exchanger may be detected after a predetermined time. .. An example of determining the interruption of the additional heating operation by the water temperature flowing into the additional heating heat exchanger was shown, but the additional heating operation is interrupted when the combustion amount of the hot water supply burner is equal to or less than a predetermined value, such as the opening of the proportional valve. It may be provided. An example of a water heater with a water filling function that counts the amount of water and fills it with water is shown, but a water heater with a water filling function that fills water with the output of a water level sensor or does not have a water filling function. The present invention can be applied to all water heaters having an additional heating function, such as applying the present invention to a water heater. Although gas is shown as an example of fuel, liquid fuel such as kerosene may be used. Although an example in which a heating instruction is given by operating the heating switch is shown, for example, the hot water temperature of the bathtub is detected every predetermined time, and when the hot water temperature is low, the heating condition is satisfied and the hot water is heated. Perform additional heating function
The present invention may be applied to (automatic reheating).

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of the present invention.

FIG. 2 is a schematic view of a water heater with an additional heating function showing an embodiment of the present invention.

[Explanation of symbols]

 1 Hot water heater with additional heating function 2 Hot water supply burner 3 Additional heating burner 4 Fuel supply path 5 Proportional valve 6 Hot water supply on-off valve 7 Additional heating on-off valve 8 Hot water heat exchanger 9 Control heating device 10 Control device 11 Additional heating function 12 Reheating standby function

Claims (1)

[Claims] 1. A hot water supply burner, an additional heating burner, and a fuel supply path for supplying fuel to the hot water supply burner and the additional heating burner, and supplies fuel to each of the burners in accordance with the amount of electricity supplied. One proportional valve, a hot water supply opening / closing valve provided between the proportional valve and the hot water supply burner to intermittently supply fuel to the hot water supply burner, and provided between the proportional valve and the additional heating burner And an additional heating on-off valve for intermittently supplying fuel to the additional heating burner, and a hot water heat exchanger for exchanging heat between the heat generated in the hot water supply burner and water supplied from the hot water supply port and flowing out from the hot water supply port. A reheating heat exchanger for exchanging heat between the heat generated in the reheating burner and the water in the tub which is supplied from the tub and flows out into the tub again, and the proportional valve, the hot water supply opening / closing valve, and the reheating opening / closing valve. With a control device that controls energization to supply hot water and reheat A water heater with an additional heating function, wherein the control device has an additional heating operation function of performing combustion with the additional heating burner when an additional heating condition is satisfied, and the additional heating operation function is an additional heating operation. At the same time, when performing a hot water supply operation in which combustion is performed by the hot water supply burner, the hot water heating operation is stopped until the hot water supply operation is stopped, and when the hot water supply operation is stopped, a hot water standby function is resumed to restart the hot water operation. A water heater with an additional heating function.