JP2022076347A - Water heater - Google Patents

Abstract

To obtain a quick water-heating function without using a heater having a large heating capacity in a water heating device having a water quantity sensor 5 and a water quantity servo 6 which are arranged at a water supply path 2 to a water heater 1 or at a tap path 3 from the water heater 1, being a water heating device in which a heater 41 for heating water supplied to a tap faucet instrument 4, and a water temperature sensor 42 for detecting a temperature of water at an upstream side of the heater 41 are arranged at the tap faucet instrument 4 at a downstream side of the tap path 3, and when a detection water temperature of the water temperature sensor 42 is lower than a prescribed temperature when an uncorking operation of the tap faucet instrument 4 is performed, quick water heating control for heating water by carrying electricity to the heater 41 up until the detection water temperature of the water temperature sensor 42 reaches a prescribed temperature or higher.SOLUTION: In a condition that a tap temperature from a tap faucet instrument 4 does not rise to a prescribed temperature even if a heating amount of a heater 41 is set to a maximum value at quick water heating control, water quantity throttle control for throttling a water quantity by a water quantity servo 6 is performed.SELECTED DRAWING: Figure 1

Description

The present invention includes a water heater, a water supply channel for supplying water to the water heater, a hot water supply channel for supplying hot water discharged from the water heater, a hot water tap device connected to the downstream end of the hot water supply channel, and a water supply channel or a water supply channel. The present invention relates to a hot water supply device including a water amount sensor provided in a hot water supply channel and a water amount servo provided in a water supply channel or a hot water supply channel.

Conventionally, as this type of hot water supply device, in order to prevent cold water from being discharged at the beginning of opening the hot water tap device, the hot water tap device is equipped with a heater that heats the water supplied to the hot water tap device via the hot water outlet. , A water temperature sensor that detects the temperature of the water supplied to the hot water tap device via the hot water tap device is provided on the upstream side of the heater, and when the hot water tap device is opened, the detected water temperature of the water tap device is provided. Is known to perform immediate hot water control in which the heater is energized to heat the water until the detected water temperature of the water temperature sensor becomes equal to or higher than the predetermined temperature when the temperature is lower than the predetermined temperature (see, for example, Patent Document 1).

However, in this case, when the hot water tap device is opened with a large opening, the amount of water increases, the heating capacity of the heater cannot catch up, and the hot water discharge temperature from the hot water tap device becomes lower than the predetermined temperature. In this case, it is conceivable to use a heater having a large heating capacity, but in this case, the space occupied by the heater becomes large, the size of the hot water tap device becomes large, and the cost increases.

Japanese Unexamined Patent Publication No. 2017-36877

In view of the above points, the present invention provides a hot water supply device capable of obtaining an immediate hot water function that rapidly raises the hot water temperature when opening a hot water tap device without using a heater having a large heating capacity. Is the issue.

In order to solve the above problems, the present invention is connected to a water supply device, a water supply channel for supplying water to the water supply device, a hot water supply channel for supplying hot water discharged from the water supply device, and a downstream end of the hot water supply channel. A hot water supply device including a hot water tap device, a water amount sensor provided in a water supply channel or a hot water channel, a water volume servo provided in a water supply channel or a hot water channel, and a control means. A heater that heats the water supplied to the hot water tap device and a water temperature sensor that detects the temperature of the water supplied to the hot water tap device via the hot water tap device are provided on the upstream side of the heater, and the control means is the hot water tap. If the water temperature detected by the water temperature sensor is lower than the specified temperature when the device is opened, the heater is energized to heat the water until the water temperature detected by the water temperature sensor exceeds the specified temperature. Under the condition that the temperature of the hot water from the hot water tap does not rise to the specified temperature even if the heating amount of the heater is maximized at the time of immediate hot water control, the water amount throttle control that throttles the water amount by the water amount servo is executed. It is characterized by.

According to the present invention, when the hot water outlet temperature does not rise to a predetermined temperature even if the heating amount of the heater is maximized by opening the hot water tap device with a large opening, the amount of water is reached. The throttle control is executed and the hot water temperature rises rapidly. Therefore, the immediate hot water function can be obtained without using a heater having a large heating capacity, and it is possible to avoid an increase in size and cost of the hot water tap device.

In the present invention, the target heating amount of the heater required to raise the hot water discharge temperature from the hot water tap device to the above-mentioned predetermined temperature from the detected water amount of the water amount sensor and the detected water temperature of the water temperature sensor at the time of immediate hot water control is targeted. When the target heating amount exceeds the maximum heating amount of the heater, it is determined that the above conditions are met, and the water amount throttle control may be executed. Furthermore, in the water amount throttle control, the amount of water at which the temperature of the hot water discharged from the hot water tap device becomes the above-mentioned predetermined temperature at the maximum heating amount of the heater is obtained as the target throttled water amount, and the water amount servo is used so that the detected water amount of the water amount sensor becomes the target throttled water amount. You just have to squeeze the amount of water.

When the target heating amount is lower than the maximum heating amount of the heater, it is desirable to adjust the heating amount of the heater to the target heating amount without performing the water amount throttle control. According to this, even when the water amount throttle control is not performed, the temperature of the hot water discharged from the hot water tap device can be maintained at the above-mentioned predetermined temperature.

By the way, when the water heater is equipped with a burner and a heat exchanger heated by the combustion of the burner, the burner must have a water amount detected by the water amount sensor not equal to or more than a predetermined lower limit water amount in order to prevent the heat exchanger from burning empty. Burning does not start. Here, the immediate hot water control is a control performed to prevent cold water from being discharged from the hot water tap device until the hot water heated by the heat exchanger reaches the hot water tap device. Therefore, if the amount of water detected by the water amount sensor does not exceed the predetermined lower limit amount of water at which the burner starts to burn, it is useless to perform immediate hot water control. In this case, it is desirable to prohibit the execution of immediate hot water control. ..

The explanatory view which shows typically the hot water supply apparatus of embodiment of this invention. The flow diagram which shows the content of the immediate hot water control performed by the control means of the hot water supply device of embodiment.

The hot water supply device of the embodiment of the present invention shown in FIG. 1 includes a water heater 1, a water supply channel 2 for supplying water to the water heater 1, a hot water supply channel 3 for supplying hot water discharged from the water heater 1, and a hot water supply channel. It includes a water heater 4 connected to the downstream end of the water heater 4, a water amount sensor 5 provided in the water supply channel 2, a water amount servo 6 also provided in the water supply channel 2, and a controller 7 as a control means. A remote controller 71 is connected to the controller 7. The water amount sensor 5 may be provided in the hot water passage 3, or the water amount servo 6 may be provided in the hot water passage 3.

In the present embodiment, the water heater 1 includes a burner 11 and a heat exchanger 12 heated by combustion of the burner 11. The water supply channel 2 is connected to the inlet side of the heat exchanger 12, and the hot water channel 3 is connected to the outlet side of the heat exchanger 12. Further, the water supply channel 2 is provided with a water supply temperature sensor 8 for detecting the temperature of the water flowing in the water supply channel 2, and the hot water supply channel 3 is provided with a hot water temperature sensor 9 for detecting the temperature of the hot water flowing in the hot water supply channel 3. Has been done.

The controller 7 controls the hot water supply based on the detection signals from the water amount sensor 5, the water supply temperature sensor 8 and the hot water temperature sensor 9. In the hot water supply control, first, when the detected water amount of the water amount sensor 5 becomes a predetermined lower limit water amount (for example, 2.5 L / min) or more by the opening operation of the water heater 4, the burner 11 is ignited and combustion is started. Let me. Then, from the detected water amount of the water amount sensor 5 and the detected water temperature of the water supply temperature sensor 8, the combustion amount of the burner 12 required to discharge hot water having a predetermined hot water temperature set by the remote control 71 is calculated as the target combustion amount. Then, feed-forward control is performed to control the combustion amount of the burner 12 so as to reach the target combustion amount, and further, the combustion amount of the burner 12 is feedback-controlled so that the detection temperature of the hot water temperature sensor 9 becomes the set hot water discharge temperature. Further, if the amount of water is too large and the detection temperature of the hot water temperature sensor 9 does not rise to the set hot water temperature even if the combustion amount of the burner 11 is maximized, the detected temperature of the hot water temperature sensor 9 rises to the set hot water temperature. The amount of water is reduced by the water amount servo 6 until the temperature is increased.

By the way, after the hot water supply is stopped, the hot water remaining in the hot water passage 3 cools down. Then, when the hot water supply is restarted by the opening operation of the hot water tap device 4, if the cold water remaining in the hot water outlet 3 is discharged from the hot water tap device 4, the user is uncomfortable.

Therefore, in the present embodiment, the hot water tap device 4 has a heater 41 for heating the water supplied to the hot water tap device 4 via the hot water tap device 3 and water supplied to the hot water tap device 4 via the hot water tap device 3. A water temperature sensor 42 is provided to detect the temperature of the heater 41 on the upstream side of the heater 41. Then, if the detected water temperature of the water temperature sensor 42 is lower than the predetermined temperature when the hot water tap device 4 is opened, the controller 7 is a heater until the detected water temperature of the water temperature sensor 42 becomes equal to or higher than the predetermined temperature. Immediate hot water control is performed by energizing 41 to heat water. It should be noted that this predetermined temperature is set to be lower than the above-mentioned set hot water temperature, for example, about 30 ° C., but some users may feel that the predetermined temperature is low at about 30 ° C., so the predetermined temperature is changed by the remote controller 71. It is desirable to be able to do it.

Hereinafter, the immediate hot water control will be described in detail with reference to FIG. In the immediate hot water control, it is determined in STEP1 that the detected water amount W of the water amount sensor 5 becomes equal to or more than the predetermined lower limit water amount YWmin for starting the combustion of the burner 11, and in STEP2, the detected water temperature T of the water temperature sensor 42 is higher than the predetermined temperature YT. It starts when it is determined to be low. When it is determined in STEP1 that W <YWmin or T ≧ YT in STEP2, the process proceeds to STEP3 to turn off the heater 41 (stop the energization of the heater 41) and return to STEP1. Therefore, when the detected water temperature T of the water temperature sensor 42 is lower than the predetermined temperature YT, the immediate hot water control is performed until the detected water temperature T of the water temperature sensor 42 becomes equal to or higher than the predetermined temperature YT.

In the immediate hot water control, first, in STEP 4, the heater 41 required to raise the hot water discharge temperature from the hot water tap device 4 from the detected water amount W of the water volume sensor 5 and the detected water temperature T of the water temperature sensor 42 to a predetermined temperature YT is heated. The amount is calculated as the target heating amount Qcom. Next, the process proceeds to STEP 5, and it is determined whether or not the target heating amount Qcom exceeds the maximum heating amount YQmax of the heater 41. Then, if Qcom ≦ YQmax, the process proceeds to STEP6, the heater 41 is turned on (the heater 41 is energized), the heating amount of the heater 41 is adjusted to be the target heating amount Qcom, and the process returns to STEP1. As a result, the temperature of the hot water discharged from the hot water tap device 4 can be maintained at a predetermined temperature YT.

When it is determined in STEP 5 that Qcom> YQmax, the water amount squeezing control for squeezing the water amount is executed by the water amount servo 6. In the water amount throttle control, first, in STEP 7, based on the detected water temperature T of the water temperature sensor 42, the amount of water at which the hot water outlet temperature from the hot water tap device 4 becomes a predetermined temperature YT at the maximum heating amount YQmax of the heater 41 is set as the target throttle water amount Wcom. calculate. Next, the process proceeds to STEP8, the water amount is throttled by the water amount servo 6 so that the detected water amount W of the water amount sensor 5 becomes the target throttle water amount Wcom, and further, the heater 41 is turned on in STEP9 to maximize the heating amount of the heater 41. Adjust the amount to YQmax and return to STEP1.

According to the immediate hot water control of the present embodiment, by opening the hot water tap device 4 with a large opening, the hot water temperature from the hot water tap device 4 is predetermined even if the heating amount of the heater 41 is set to the maximum heating amount YQmax. When the temperature does not rise to YT, the water volume throttle control is executed and the hot water temperature rises rapidly. Therefore, the immediate hot water function can be obtained without using a heater having a large heating capacity, and it is possible to avoid an increase in size and cost of the hot water tap device 4.

A hot water temperature sensor for detecting the hot water temperature from the hot water tap device 4 is provided on the downstream side of the heater 41, and even if the heating amount of the heater 41 is set to the maximum heating amount YQmax, the detected temperature of the hot water temperature sensor becomes the predetermined temperature YT. It is also possible to execute the water amount throttle control when the temperature does not rise, and further, in the water volume throttle control, throttle the water amount by feedback control so that the detection temperature of the hot water temperature sensor becomes a predetermined temperature YT. However, this requires a hot water temperature sensor, which increases the cost.

On the other hand, in the present embodiment, when the target heating amount Qcom calculated as described above exceeds the maximum heating amount YQmax of the heater 41, even if the heating amount of the heater 41 is set to the maximum heating amount YQmax, the hot water tap device. It is determined that the hot water temperature from No. 4 does not rise to the predetermined temperature YT, and the water amount throttle control is executed. Further, in the water volume throttle control, the target throttle water amount Wcom is calculated as described above, and the water volume is throttled to the target throttle water volume Wcom by the water volume servo 6, so that the hot water temperature from the hot water tap device 4 is feed-forward controlled. The temperature is raised to a predetermined temperature YT. According to this, the hot water temperature sensor for detecting the hot water temperature from the hot water tap device 4 becomes unnecessary, and the cost increase can be avoided.

By the way, the immediate hot water control is a control performed to prevent cold water from being discharged from the hot water tap device 4 until the hot water heated by the heat exchanger 12 reaches the hot water tap device 4. Therefore, if the detected water amount W of the water amount sensor 5 does not become equal to or more than a predetermined lower limit water amount YWmin for starting combustion of the burner 11, it is useless to perform immediate hot water control. Therefore, in the present embodiment, when W <YWmin, it returns to STEP1 from STEP1 through STEP3, and execution of immediate hot water control of STEP4 or less is prohibited.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, the water heater 1 of the above embodiment includes the burner 11 and the heat exchanger 12 heated by the combustion of the burner 11, but may be a hot water storage type equipped with a hot water storage tank. In this case, in STEP 1 of FIG. 2, when the detected water amount W of the water amount sensor 5 exceeds a predetermined threshold value (for example, 1.5 L / min), it is determined that the hot water tap device 4 has been opened. Then proceed to STEP2. This threshold value may be set and changeable by the remote controller 71.

1 ... water heater, 11 ... burner, 12 ... heat exchanger, 2 ... water supply channel, 3 ... hot water channel, 4 ... hot water tap device, 41 ... heater, 42 ... water temperature sensor, 5 ... water volume sensor, 6 ... water volume servo, 7 ... Controller (control means).

Claims (5)

A water heater, a water supply channel that supplies water to the water heater, a hot water supply channel that supplies hot water discharged from the water heater, a hot water tap device connected to the downstream end of the hot water supply channel, and a water supply channel or a hot water supply channel. A hot water supply device including a water amount sensor, a water amount servo provided in a water supply channel or a hot water supply channel, and a control means.
The hot water tap device has a heater that heats the water supplied to the hot water tap device via the hot water channel, and a water temperature sensor that detects the temperature of the water supplied to the hot water tap device via the hot water tap device on the upstream side of the heater. Is provided,
If the water temperature detected by the water temperature sensor is lower than the predetermined temperature when the hot water tap device is opened, the control means energizes the heater until the water temperature detected by the water temperature sensor reaches the predetermined temperature or higher. In the one that controls the immediate hot water to heat
Hot water supply is characterized by executing water volume throttle control that throttles the water volume with a water volume servo under the condition that the hot water discharge temperature from the hot water tap device does not rise to a predetermined temperature even if the heating amount of the heater is maximized during immediate hot water control. Device. At the time of the immediate hot water control, the heating amount of the heater required to raise the hot water discharge temperature from the hot water tap device from the detected water amount of the water amount sensor and the detected water temperature of the water temperature sensor to the predetermined temperature is set as the target heating amount. The hot water supply device according to claim 1, wherein when the target heating amount exceeds the maximum heating amount of the heater, it is determined that the conditions are met, and the water amount throttle control is executed. In the water amount throttle control, the amount of water at which the hot water outlet temperature from the hot water tap device becomes the predetermined temperature at the maximum heating amount of the heater is obtained as the target throttle water amount, and the water amount detected by the water amount sensor becomes the target throttle water amount. The hot water supply device according to claim 2, wherein the amount of water is reduced by a water amount servo. 2. Water heater. The water heater according to any one of claims 1 to 4, wherein the water heater includes a burner and a heat exchanger heated by combustion of the burner, and the amount of water detected by the water amount sensor causes combustion of the burner. A hot water supply device characterized in that execution of the immediate hot water control is prohibited unless the amount of water exceeds a predetermined lower limit to be started.

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