Hot-water supply device

Patent metadata

Field	Value
Publication number	US-11441787-B2
Application number	US-202017096889-A
Country	US
Kind code	B2
Filing date	Nov 12, 2020
Priority date	Nov 25, 2019
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

Provided is a hot-water supply device. A process performed by a control device of the hot-water supply device includes: a step of shifting an action mode of the hot-water supply device to an instant hot-water mode; a step of measuring an amount of water X; a step of determining that another tap interruption occurs when the amount of water X is equal to or greater than a basic flow amount Y+α; a step of stopping action of a circulation pump; a step of re-learning the amount of water X when the amount of water X is less than a basic flow amount Y−β; a step of ending the instant hot-water circulation mode when an end condition of the instant hot-water mode is satisfied; and a step of measuring the amount of water X when the end condition of the instant hot-water mode is not satisfied.

First claim

What is claimed is:

1. A hot-water supply device having plural action modes, comprising:
a can body which is arranged between a water entry path and a hot-water discharge path;
a heat exchanger which is equipped inside the can body and heats water;
a circulation pump which is arranged in a circulation passage to send all or part of water flowing out from the hot-water discharge path of the heat exchanger to the water entry path of the heat exchanger and which is configured to send the water to the heat exchanger;
a water amount sensor which measures an amount of water flowing into the heat exchanger;
a temperature sensor which measures a temperature of the water flowing into the heat exchanger;
a temperature sensor which measures a temperature of water flowing out from the heat exchanger; and
a control device being configured to control an action of the hot-water supply device, wherein
the plural action modes comprise a hot-water supply mode in which warm water is supplied to the outside of the hot-water supply device, and an instant hot-water circulation mode in which water is circulated inside the hot-water supply device, and
the control device is configured to switch the instant hot-water circulation mode to the hot-water supply mode based on the fact that,
in the instant hot-water circulation mode,
the control device is configured such that it determines that the water flows out from the hot-water supply tap based on the fact that an amount of water measured after the hot-water supply device starts to run is greater than an amount of water measured when the hot-water supply device starts to run by a preset amount,
water flows out from a hot-water supply tap,
when the amount of water measured after the hot-water supply device starts to run is less than a basic flow amount which is determined by the amount of water measured at the start of a first operation of the water heater by the preset amount, relearn the basic flow amount according to the amount of water at that time.

2. The hot-water supply device according to claim 1 , wherein the control device is configured to determine that the water flows out from the hot-water supply tap based on the fact that an amount of water measured after the hot-water supply device starts to run is greater than an amount of water measured when the hot-water supply device starts to run by a preset amount.

3. The hot-water supply device according to claim 2 , wherein the control device is configured to start combustion in the hot-water supply device based on switching from the instant hot-water circulation mode to the hot-water supply mode.

4. The hot-water supply device according to claim 3 , wherein the control device is configured to start an operation of the circulation pump based on the fact that, when the combustion is not performed, a temperature of water flowing into the can body or a temperature of water flowing out from the can body is equal to or lower than a preset temperature.

5. The hot-water supply device according to claim 4 , wherein the control device is configured to operate the circulation pump based on the fact that, while the circulation pump is stopped when the combustion in the hot-water supply device is prohibited, running conditions preset to operate the circulation pump are satisfied.

6. The hot-water supply device according to claim 5 , wherein the preset running conditions comprise:
the temperature of the water flowing into the can body or the temperature of the water flowing out from the can body being equal to or lower than the preset temperature; or
a preset time having elapsed after the circulation pump is stopped and an amount of water flowing into the can body is equal to or smaller than a reference amount specified to start combustion of the can body.

7. The hot-water supply device according to claim 3 , wherein the control device is configured to operate the circulation pump based on the fact that, while the circulation pump is stopped when the combustion in the hot-water supply device is prohibited, running conditions preset to operate the circulation pump are satisfied.

8. The hot-water supply device according to claim 2 , wherein the control device is configured to start an operation of the circulation pump based on the fact that, when the combustion is not performed, a temperature of water flowing into the can body ora temperature of water flowing out from the can body is equal to or lower than a preset temperature.

9. The hot-water supply device according to claim 8 , wherein the control device is configured to operate the circulation pump based on the fact that, while the circulation pump is stopped when the combustion in the hot-water supply device is prohibited, running conditions preset to operate the circulation pump are satisfied.

10. The hot-water supply device according to claim 2 , wherein the control device is configured to operate the circulation pump based on the fact that, while the circulation pump is stopped when the combustion in the hot-water supply device is prohibited, running conditions preset to operate the circulation pump are satisfied.

11. The hot-water supply device according to claim 1 , wherein the control device is configured to start combustion in the hot-water supply device based on switching from the instant hot-water circulation mode to the hot-water supply mode.

12. The hot-water supply device according to claim 11 , wherein the control device is configured to start an operation of the circulation pump based on the fact that, when the combustion is not performed, a temperature of water flowing into the can body or a temperature of water flowing out from the can body is equal to or lower than a preset temperature.

13. The hot-water supply device according to claim 12 , wherein the control device is configured to operate the circulation pump based on the fact that, while the circulation pump is stopped when the combustion in the hot-water supply device is prohibited, running conditions preset to operate the circulation pump are satisfied.

14. The hot-water supply device according to claim 11 , wherein the control device is configured to operate the circulation pump based on the fact that, while the circulation pump is stopped when the combustion in the hot-water supply device is prohibited, running conditions preset to operate the circulation pump are satisfied.

15. The hot-water supply device according to claim 1 , wherein the control device is configured to start an operation of the circulation pump based on the fact that, when the combustion is not performed, a temperature of water flowing into the can body or a temperature of water flowing out from the can body is equal to or lower than a preset temperature.

16. The hot-water supply device according to claim 15 , wherein the control device is configured to operate the circulation pump based on the fact that, while the circulation pump is stopped when the combustion in the hot-water supply device is prohibited, running conditions preset to operate the circulation pump are satisfied.

17. The hot-water supply device according to claim 1 , wherein the control device is configured to operate the circulation pump based on the fact that, while the circulation pump is stopped when the combustion in the hot-water supply device is prohibited, running conditions preset to operate the circulation pump are satisfied.

18. The hot-water supply device according to claim 17 , wherein the preset running conditions comprise:
the temperature of the water flowing into the can body or the temperature of the water

Assignees

• Noritz Corp

Inventors

• Tateishi Shingo
• Nabeshima Hiroki
• Nomura Hideki
• Kaneshiro Takanobu
• Yamanishi Hiromi
• Hasegawa Ryo
• Yasukawa Kenichiro

Classifications

• F24D2220/0207

  Pumps · CPC title

• Y10T137/6497

  Hot and cold water system having a connection from the hot to the cold channel · CPC title

• E03C1/044

  having a heating or cooling apparatus in the supply line (water heaters, e.g. with continuous flow, F24H) · CPC title

• F24D17/0078 Primary

  Recirculation systems · CPC title

• Y10T137/6579

  Circulating fluid in heat exchange relationship · CPC title