CN112856543B - Hot water supply device - Google Patents

Hot water supply device Download PDF

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Publication number
CN112856543B
CN112856543B CN202011093938.4A CN202011093938A CN112856543B CN 112856543 B CN112856543 B CN 112856543B CN 202011093938 A CN202011093938 A CN 202011093938A CN 112856543 B CN112856543 B CN 112856543B
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CN
China
Prior art keywords
hot water
water supply
temperature
pipe
circulation
Prior art date
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Active
Application number
CN202011093938.4A
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Chinese (zh)
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CN112856543A (en
Inventor
安川健一郎
锅岛弘树
立石真吾
野村秀树
金城贵信
山西裕美
长谷川良
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Noritz Corp
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Noritz Corp
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/0078—Recirculation systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/107—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/184—Preventing harm to users from exposure to heated water, e.g. scalding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/238—Flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/335—Control of pumps, e.g. on-off control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/36—Control of heat-generating means in heaters of burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/12—Arrangements for connecting heaters to circulation pipes
    • F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/18—Measuring temperature feedwater temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/21—Measuring temperature outlet temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/02—Fluid distribution means
    • F24D2220/0207—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/042—Temperature sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/044—Flow sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/104—Inspection; Diagnosis; Trial operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/215—Temperature of the water before heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/281—Input from user
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/305—Control of valves
    • F24H15/325—Control of valves of by-pass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/395—Information to users, e.g. alarms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
    • F24H15/429—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data for selecting operation modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F24H15/45—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based remotely accessible
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/6416—With heating or cooling of the system
    • Y10T137/6497—Hot and cold water system having a connection from the hot to the cold channel

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Abstract

The present invention addresses the problem of preventing high-temperature warm water from flowing out of a water faucet even when a circulation pump fails to turn on. The hot water supply device includes: a first piping connected to the water inlet; a flow rate detector for detecting a flow rate of water in the first pipe; a heating mechanism for heating water; and a second pipe through which warm water flows. The second pipe is connected to the first pipe via the third pipe. The hot water supply device further includes a circulation pump that is disposed on the path of the first pipe and that, when in operation, sends out the hot water in the third pipe in the direction of the heating mechanism, and a control device. The control device operates the circulation pump based on the execution command of the real-time hot water circulation mode, and adjusts the heating temperature of the heating mechanism so that the temperature of the hot water becomes equal to or lower than the limit temperature when the setting of the hot water outflow temperature exceeds the limit temperature.

Description

Hot water supply device
Technical Field
The present disclosure relates to a hot water supply apparatus, and more particularly, to a safety function in a real-time hot water circulation mode.
Background
Some of the hot water supply apparatuses include a so-called real-time hot water function of supplying hot water at an appropriate temperature immediately after the start of the supply of the hot water even when the apparatus is not used for a long period of time. The hot water supply device generally includes an inflow side pipe, an outflow side pipe, and a heating mechanism.
In a hot water supply device having a real-time hot water function, hot water is circulated through piping and a heating mechanism in the hot water supply device by a circulation pump (hereinafter, referred to as a "real-time hot water circulation mode"). The hot water supply device circulates the hot water inside the device, thereby immediately supplying the hot water at an appropriate temperature from the start of the supply of the hot water.
Depending on the country or region, a pipe connected to a tap for warm water may be connected to a pipe connected to a tap for water by a pipe for circulation. In the real-time hot water circulation mode of the hot water supply device connected to the water distribution pipe of the above-described structure, the hot water circulates through the heating mechanism and the circulation pipe. Therefore, when the warm water circulates at a high temperature, if the user turns the water tap, there is a possibility that the warm water at a high temperature flows out, and there is a risk. Therefore, a technology for improving safety in a real-time hot water circulation mode is required.
Regarding the real-time hot water circulation, for example, japanese patent application laid-open No. 2007-003165 (patent document 1) discloses that "a temperature detector is provided between an electric heater of a return pipe and a second connection portion on an upstream side of a hot water supply pipe, and a high-temperature hot water outflow prevention means that stops the operation of a circulation pump and the electric heater" the real-time hot water unit when a detected temperature of the temperature detector exceeds an upper limit temperature set to a temperature higher than a real-time hot water set temperature is included in a controller. (refer to the abstract)
With respect to the real-time hot water circulation, another example is disclosed in japanese patent laid-open No. 11-014142 (patent document 2).
[ Prior Art literature ]
[ patent literature ]
Patent document 1 Japanese patent laid-open No. 2007-003165
[ patent document 2] Japanese patent laid-open No. 11-014142
Disclosure of Invention
[ problem to be solved by the invention ]
According to the techniques disclosed in patent document 1 and patent document 2, when an ON (ON) fault (a state in which the circulation pump cannot be stopped in an operating state) occurs in the real-time hot water circulation mode, there is a possibility that high-temperature hot water flows out from the water faucet for water. Therefore, there is a need for a technique that does not allow high-temperature hot water to flow out from a water faucet even when a circulation pump is turned ON (ON) in a real-time hot water circulation mode.
The present disclosure has been made in view of the above-described background, and an object of an aspect is to provide a technique that does not allow high-temperature warm water to flow out of a faucet for water even when a circulation pump is turned ON (ON) in a real-time hot water circulation mode.
[ means of solving the problems ]
The hot water supply device according to an embodiment includes: a first piping connected to the water inlet; a flow rate detector for detecting a flow rate of water in the first pipe; a heating mechanism for heating water flowing in from the first pipe; and a second pipe through which the warm water heated by the heating means flows. The second pipe is connected to the first pipe via an external third pipe. The hot water supply device further includes a circulation pump that is disposed on the path of the first pipe and that, when in operation, sends out the hot water in the third pipe in the direction of the heating mechanism, and a control device. The control device operates the circulation pump based on the execution command received in the real-time hot water circulation mode, and adjusts the heating temperature of the heating means so that the temperature of the hot water in the real-time hot water circulation mode becomes equal to or lower than the limit temperature when the setting of the hot water outflow temperature exceeds the predetermined limit temperature.
[ Effect of the invention ]
According to an embodiment, even when the circulation pump is turned ON (ON) in the real-time hot water circulation mode, high-temperature hot water can be prevented from flowing out from the water faucet.
The foregoing and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a diagram showing an example of a hot water supply device 100 including a circulation port.
Fig. 2 is a diagram showing an example of the hot water supply device 200 that does not include the circulation port.
Fig. 3 is a diagram showing an example of the configuration of the controller 250.
Fig. 4 is a diagram schematically showing an example of the operation of the hot water supply device 200 in the hot water supply mode.
Fig. 5 is a diagram showing an example of an outline of the operation of the hot water supply device 200 in the real-time hot water circulation mode.
Fig. 6 is a diagram showing an example of an outline of the operation of the hot water supply apparatus 200 when the circulation pump 207 is turned ON (ON) in the real-time hot water circulation mode.
Fig. 7 is a diagram showing an example of a first operation of the hot water supply device 200.
Fig. 8 is a diagram showing an example of a second operation of the hot water supply device 200.
Fig. 9 is a view showing another example of the hot water supply device 200 not including the circulation port.
[ description of reference numerals ]
100. 200: hot water supply device
101. 201: bypass servo
102. 108, 202, 901: flow detector
103. 105, 203: temperature detector
104. 204: heat exchanger
106. 206: water quantity servo
107. 207: circulation pump
110: water supply pipe
111. 112, 113, 211, 213: port (port)
120. 130: valve
140: hot water supply bolt
150. 250: controller for controlling a power supply
155. 160, 165, 170, 255, 260, 265, 280, 281, 282: path
214. 902: valve
301：CPU
302: memory device
303: electronic circuit
304: interface
305: bus line
306: informing device
307: remote controller
310: combustion mechanism
Detailed Description
Embodiments of the technical idea of the present disclosure will be described below with reference to the drawings. In the following description, the same reference numerals are given to the same components. Their names and functions are also identical. Therefore, detailed descriptions thereof are not repeated. In the following description, a case where water or warm water enters a place will be referred to as "inflow". In addition, the case where water or warm water is discharged from a place is called "outflow".
The hot water supply device generally includes a port for flowing in tap water and a port for flowing out heated warm water. In addition, some of the hot water supply devices include a circulation port for allowing the hot water flowing out from a port for allowing the heated hot water to flow into the hot water supply device in order to circulate the hot water in the hot water supply device in the real-time hot water circulation mode. In addition, some of the hot water supply devices do not include a separate circulation port, and the circulation port also serves as a port through which tap water flows.
The control of the real-time hot water circulation mode according to the present embodiment is mainly applicable to a hot water supply device that does not include a separate port. First, the structure of the hot water supply apparatus including the port, the structure of the hot water supply apparatus not including the port, and the structure of the controller controlling the hot water supply apparatus will be described in order. Next, a control method of the hot water supply device according to the present embodiment will be described.
[ Structure of Hot Water supply device ]
Fig. 1 is a diagram showing an example of a hot water supply device 100 including a circulation port. The hot water supply apparatus 100 includes a bypass servo (service) 101, flow rate detectors 102 and 108, temperature detectors 103 and 105, a heat exchanger 104, a water amount servo 106, a circulation pump 107, a port 111, a port 112 and 113, and a controller 150.
The port 111 is connected to a water supply pipe 110 for supplying water. Water is supplied from the water supply pipe 110 to the hot water supply device 100 via the port 111. The water flows into the hot water supply device 100 by the inflow pressure from the water supply pipe 110. Therefore, when the piping in the hot water supply device 100 is filled with water or warm water, the inflow of water from the water supply pipe 110 to the hot water supply device 100 is stopped. When the valve 130 is opened, water flowing in from the water supply pipe 110 flows out from the hot water supply plug 140.
A portion of the water flowing from the port 111 into the hot water supply device 100 flows into the heat exchanger 104 through the path 155. A part of the water flowing into the hot water supply device 100 from the port 111 flows out from the port 113 via the paths 160 and 165. The path 155 is a path from the outlet of the bypass servo 101 to the inlet of the heat exchanger 104. The path 160 is a path from the outlet of the bypass servo 101 to the joining point of the path 165. Path 165 is the path from the outlet of heat exchanger 104 to port 113.
The port 112 and the port 113 are connected to the same pipe. In the real-time hot water circulation mode, the hot water flowing out of the port 113 flows into the hot water supply device 100 again from the port 112, and circulates through the heat exchanger 104.
The port 113 is connected to a pipe connected to the hot water supply plug 140. In the hot water supply mode, warm water flowing out of the port 113 is supplied from the hot water supply peg 140 to a user. The hot water supply mode is an operation mode when the hot water heated by the heat exchanger 104 flows out from the hot water supply plug 140 (when the user uses the hot water). In the real-time hot water circulation mode, the hot water flowing out of the port 113 circulates in the hot water supply device 100 via the port 112.
The bypass servo 101 adjusts the ratio of the amount of water flowing into the path 155 to the amount of water flowing into the path 160. As an example, the bypass servo 101 has a plug using a stepping motor or the like, and the amount of water flowing into the path 160 can be adjusted by the plug. The water flowing into the heat exchanger 104 via the path 155 becomes warm water heated by the heat exchanger 104. The water flowing into the path 160 is mixed with the warm water flowing out of the heat exchanger 104 in the path 165, and the temperature of the warm water is adjusted.
The flow detector 102 detects the amount of water flowing through the path 155. In one aspect, the flow rate detector 102 includes a water wheel or the like therein, and is configured to detect the amount of water based on the amount of rotation of the water wheel or the like. In this case, the flow rate detector 102 outputs a signal generated based on the rotation amount of the water wheel or the like to the controller 150. The signal output to the controller 150 may be a digital signal or an analog signal. The controller 150 may infer the amount of water flowing through the path 155 based on the input signal and determine whether water flows through the path 155.
The temperature detector 103 detects the temperature of the water passing through the flow detector 102. As shown in fig. 1, water flowing in from the water supply pipe 110 and warm water flowing through the path 170 by the circulation pump 107 flow into the flow detector 102. Therefore, in the case where the hot water supply apparatus 100 operates in the real-time hot water circulation mode, the temperature detector 103 detects the temperature of the warm water circulating in the paths 155, 165, and 170. In addition, in the case where the hot water supply apparatus 100 is not operated in the real-time hot water circulation mode, the temperature detector 103 detects the temperature of the water flowing into the hot water supply apparatus 100 from the water supply pipe 110. The temperature detector 103 may detect the temperature of water flowing into the hot water supply device 100 from the water supply pipe 110, water mixed with the hot water circulating through the paths 155, 165, and 170, or hot water.
In some aspects, the temperature detector 103 may also be a thermistor (thermal). In this case, the temperature detector 103 outputs a signal generated based on the temperature of the water passing through the flow detector 102 to the controller 150. The signal output to the controller 150 may be a digital signal or an analog signal. The controller 150 may detect the temperature of the water flowing in the path 155 based on the input signal.
The heat exchanger 104 (heating means) uses heat generated by a combustion means (not shown) or the like to raise the temperature of water flowing into the heat exchanger 104. In certain aspects, the combustion mechanism may include a burner (burner) that generates heat by burning gas or oil or the like. On the other hand, the heat exchanger 104 includes a tube having high thermal conductivity inside. Around the tube, a plate for transferring heat is sometimes also arranged. The combustion mechanism heats the tubes and plates. The water is heated through the tube to become warm water. Warm water flows from the path 165 toward the port 113.
The temperature detector 105 detects the temperature of the warm water flowing through the path 165. When the valve 120 is opened, warm water via the path 165 flows out of the hot water supply plug 140. Therefore, the temperature detector 105 can be said to directly detect the temperature of the warm water used by the user. In some aspects, the temperature detector 105 may also be a thermistor. In this case, the temperature detector 105 outputs a signal generated based on the temperature of the warm water flowing in the path 165 to the controller 150. The signal output to the controller 150 may be a digital signal or an analog signal. The controller 150 may detect the temperature of the warm water flowing in the path 165 based on the input signal.
The water quantity servo 106 adjusts the quantity of warm water flowing out from the port 113. As an example, the water quantity servo 106 includes a stopper using a stepping motor or the like, and the amount of warm water flowing out of the port 113 can be adjusted by the stopper.
When the valve 120 is opened, the warm water flowing out of the port 113 flows out of the hot water supply plug 140. When the valve 120 is closed and the hot water supply device 100 is operated in the real-time hot water circulation mode, the hot water flowing out of the port 113 flows into the port 112.
The circulation pump 107 circulates the warm water flowing in from the port 112 in the heat exchanger 104. In some aspects, the circulation pump 107 may be a pump driven by a Direct Current (DC) motor or the like. In that case, the DC motor of the circulation pump 107 may be controlled by the controller 150.
The flow detector 108 detects the amount of warm water flowing in the path 170. In one aspect, the flow rate detector 108 includes a water wheel or the like therein, and is configured to detect the amount of water based on the amount of rotation of the water wheel or the like. In this case, the flow rate detector 108 outputs a signal generated based on the rotation amount of the water wheel or the like to the controller 150. The signal output to the controller 150 may be a digital signal or an analog signal. The controller 150 may infer the amount of warm water of the path 170 based on the input signal and determine whether the warm water flows through the path 170.
The controller 150 controls the entire hot water supply apparatus 100. Specifically, the controller 150 estimates the water volume of each path by acquiring signals output from the flow rate detector 102 and the flow rate detector 108, and estimates the temperature of water or warm water flowing through each path by acquiring signals output from the temperature detector 103 and the temperature detector 105. Further, the controller 150 can adjust the flow rate and temperature of water or warm water by controlling various actuators (bypass servo 101, water servo 106, circulation pump 107, heat exchanger 104, and the like). In one aspect, the controller 150 may be provided inside the hot water supply apparatus 100 or may be provided outside the hot water supply apparatus 100.
Next, an outline of the operation of the hot water supply device 100 in the hot water supply mode and the real-time hot water circulation mode will be described. Further, the operation of the hot water supply apparatus 100 when the circulation pump 107 fails while the hot water supply apparatus 100 is operating in the real-time hot water circulation mode will be described.
In the hot water supply mode, the hot water supply device 100 heats water flowing in from the water supply pipe 110 by the heat exchanger 104 and causes warm water to flow out from the port 113. When the valve 120 is opened, the warm water flowing out of the port 113 flows out of the hot water supply plug 140. In the hot water supply mode, the circulation pump 107 is stopped, and the hot water flowing out of the port 113 does not flow into the path 170 or flows into the path 170 only by a small amount.
In the real-time hot water circulation mode, the hot water supply apparatus 100 heats water flowing in from the water supply pipe 110 by the heat exchanger 104 and causes warm water to flow out from the port 113. In the real-time hot water circulation mode, the circulation pump 107 operates to discharge the hot water flowing out of the port 113 to the path 170 side. When the valve 120 is closed, the warm water flowing out of the port 113 is discharged by the circulation pump 107 and flows into the path 170. When the warm water during circulation reaches the temperature preset by the controller 150, the circulation pump 107 is stopped. The warm water is gradually not circulated in the hot water supply apparatus 100 based on the circulation pump 107 having stopped.
The circulation pump 107 sometimes has an ON (ON) fault while in the real-time hot water circulation mode and no longer receives control from the controller 150. When the circulation pump 107 is in an ON (ON) fault state, although the temperature of the warm water during circulation reaches a temperature preset by the controller 150, the circulation pump 107 is not stopped, and thus the warm water continues to circulate.
The controller 150 stores the state of the operation mode of the hot water supply device 100 (hot water supply mode, real-time hot water circulation mode, etc.) in an internal memory, and obtains the detection result of the water amount of the path 170 from the flow rate detector 108. Accordingly, in a state in which the operation mode of the hot water supply apparatus 100 is not the real-time hot water circulation mode, the controller 150 can determine that the circulation pump 107 is turned ON (ON) based ON the amount of water flowing through the path 170 being equal to or greater than a predetermined threshold. The controller 150 may notify the user of the failure of the circulation pump 107 using a notification device or the like. As described above, the hot water supply device 100 including the circulation port can detect the ON (ON) failure of the circulation pump 107 in the real-time hot water circulation mode.
Fig. 2 is a diagram showing an example of the hot water supply device 200 that does not include the circulation port. The hot water supply device 200 includes a bypass servo 201, a flow rate detector 202, a temperature detector 203, a temperature detector 205, a heat exchanger 204, a water amount servo 206, a circulation pump 207, ports 211 and 213, and a controller 250.
Bypass servo 201, flow rate detector 202, temperature detector 203, temperature detector 205, heat exchanger 204, water amount servo 206, circulation pump 207, port 211, port 213, and controller 250 of hot water supply apparatus 200 correspond to bypass servo 101, flow rate detector 102, temperature detector 103, and temperature detector 105 of hot water supply apparatus 100, heat exchanger 104, water amount servo 106, circulation pump 107, port 111, and port 113, and controller 150, respectively. In addition, each of path 255, path 260, and path 265 corresponds to each of path 155, path 160, and path 165.
It is understood that the hot water supply device 200 does not include a circulation port and does not include a path corresponding to the path 170, as compared to the hot water supply device 100. Instead, the hot water supply device 200 includes a circulation pump 207 on the upstream side of the bypass servo 201. The difference in the structures of the hot water supply apparatus 100 and the hot water supply apparatus 200 is caused by the difference in the structures of water channel facilities in countries, regions, and the like.
As shown in fig. 2, in a water channel facility in a country or region, a path 280 through which water flowing from the water supply pipe 110 flows and a path 281 through which warm water flowing from the hot water supply device 200 flows are connected via a path 282. The valve 214 for preventing reverse flow is provided in the path 282. Valve 214 is a valve that prevents water from flowing from path 280 into path 281.
In the water channel device having the above-described structure, it is assumed that warm water is circulated through the port 211 and the port 213 in the hot water supply device 200. Therefore, the hot water supply device 200 does not include a circulation port connected to a path branched from the path 281. Further, since the hot water supply device 200 needs to circulate the hot water through the path 281 and the path 260, the circulation pump 207 is included on the downstream side of the port 211.
Next, an outline of the operation of the hot water supply mode and the real-time hot water circulation mode of the hot water supply device 200 will be described. Further, the problem of the hot water supply device 200 when the circulation pump 207 is turned ON (ON) in the real-time hot water circulation mode will be described.
In the hot water supply mode, the hot water supply device 200 heats water flowing in from the water supply pipe 110 by the heat exchanger 204 and causes warm water to flow out from the port 213. When the valve 120 is opened, the warm water flowing out of the port 213 flows out of the hot water supply plug 140. When the warm water flowing through the path 281 flows out from the hot water supply plug 140, no water pressure is applied to the valve 214, and therefore, the warm water does not flow into the path 280 from the path 281, or only a small amount of the warm water flows into the path 280 from the path 281.
In the real-time hot water circulation mode, the hot water supply apparatus 200 heats water flowing in from the water supply pipe 110 by using the heat exchanger 204 and causes warm water to flow out from the port 213. In the real-time hot water circulation mode, the circulation pump 207 is operated to circulate the hot water from the port 211 in the direction of the path 255. As long as the valve 120 is closed, the force of the inflow port 211 is applied to the warm water flowing out of the port 213 by the circulation pump 207. Accordingly, the warm water flowing out of the port 213 flows into the port 211 via the path 281, the path 282, and the path 280. As a result, the warm water circulates in the path 280, the path 255, the heat exchanger 204, the path 265, the path 281, and the path 282.
When the temperature of the warm water during circulation reaches the temperature preset by the controller 250, the circulation pump 207 is stopped. The warm water is gradually not circulated in the hot water supply device 200 based on the circulation pump 207 having stopped.
When the circulation pump 207 is in an ON (ON) fault state, although the temperature of the warm water during circulation reaches a temperature preset by the controller 250, the circulation pump 207 is not stopped, and thus the warm water continues to circulate.
The hot water supply apparatus 100 can detect the ON (ON) failure of the circulation pump 107, but the hot water supply apparatus 200 cannot clearly detect the ON (ON) failure of the circulation pump 207 in terms of the apparatus structure. The reason why the hot water supply apparatus 200 cannot detect the ON (ON) failure of the circulation pump 207 is that the front and rear paths of the circulation pump 207 have both functions of the water inlet path in the hot water supply mode and the circulation path in the real-time hot water circulation mode.
As shown in fig. 2, the controller 250 needs to use the detection result of the flow rate detector 202 in order to determine whether the circulation pump 207 is malfunctioning. When the flow detector 202 does not detect the flow of water or warm water after the end of the real-time hot water circulation mode, the controller 250 may determine that the circulation pump 207 is normally stopped. However, conversely, when the flow detector 202 detects the flow of water or warm water after the end of the real-time hot water circulation mode, the controller 250 cannot determine whether or not the ON (ON) fault of the circulation pump 207 has occurred. The reason is that: even if the circulation pump 207 is normally turned OFF (OFF), when the user opens the valve 120 to allow the warm water to flow out of the hot water supply plug in the hot water supply mode, the flow detector 202 detects the flow of water or warm water because the water flows into the hot water supply device 200 from the water supply pipe 110. In this way, the hot water supply device 200 that does not include the circulation port cannot clearly determine whether the ON (ON) failure of the circulation pump 207 has occurred or whether only the user uses warm water, using only the detection result of the flow rate detector 202.
If the circulation pump 207 fails in the case of circulating the hot water when the hot water supply device 200 is set at a high temperature in the real-time hot water circulation mode, the high-temperature hot water continues to circulate through the path 280 even after the end of the real-time hot water circulation mode. In this state, when the user opens the valve 130, high-temperature hot water flows out from the hot water supply plug 140, and there is a risk. Therefore, in order to avoid this, the hot water supply apparatus 200 ensures safety of the user by a control method described later.
[ Structure of controller ]
Fig. 3 is a diagram showing an example of the configuration of the controller 250. The controller 250 includes a central processing unit (Central Processing Unit, CPU) 301, a memory 302, an electronic circuit 303, an interface 304, and a bus 305. The controller 250 communicates with various sensors and actuators of the hot water supply apparatus 200 to control the hot water supply apparatus 200. The controller 250 also notifies the user of information related to the hot water supply apparatus 200 by using the notification device 306. Further, the controller 250 may control the hot water supply apparatus 200 based on the user input received by the remote controller 307.
The CPU 301 executes various programs read in the memory 302, or refers to data. In some aspects, CPU 301 may be an embedded CPU, a Field programmable gate array (Field-Programmable Gate Array, FPGA), or a combination thereof. The CPU 301 may execute programs to realize various functions of the hot water supply apparatus 200. As an example, the CPU 301 may include an ON/OFF (ON/OFF) operation of an operation switch of the hot water supply apparatus 200, setting of a hot water supply temperature, various time reservation settings (also referred to as "timer settings"), and the like. The CPU 301 controls a motor, a combustion mechanism, and the like in the hot water supply device 200 based on these settings.
The memory 302 stores programs executed by the CPU 301 and data referred to by the CPU 301. In some aspects, dynamic random access memory (Dynamic Random Access Memory, DRAM) or static random access memory (Static Random Access Memory, SRAM) may also be used as the memory 302.
The electronic circuit 303 is a circuit having a dedicated function. The electronic circuit 303 may perform specific processing such as data conversion or control of an actuator instead of the CPU 301. In some aspects, the electronic circuitry 303 may include at least one application specific integrated circuit (Application Specific Integrated Circuit, ASIC), at least one field programmable gate array, or a combination thereof.
The interface 304 performs input/output of signals with an external device. The CPU 301 may control other devices via the interface 304. Interface 304 may be coupled to at least combustion mechanism 310, circulation pump 207, temperature detector 203 and temperature detector 205, flow detector 202, bypass servo 201, and water volume servo 206 of heat exchanger 204. Further, the interface 304 may be connected to a notification device 306 and a remote controller 307.
In some aspects, interface 304 may include a wired interface that inputs/outputs or transmits and receives signals in any form, a wireless interface, or a combination thereof. In another aspect, the interface 304 may use the alerting device 306, the remote controller 307, any other device, and communication protocols such as transmission control protocol/internet protocol (Transmission Control Protocol/Internet Protocol, TCP/IP), user datagram protocol (User Datagram Protocol, UDP), etc. to transceive data. In addition, the interface 304 may also communicate with cloud services and the like. The bus 305 connects the CPU 301, the memory 302, the electronic circuit 303, and the interface 304 to each other.
The notification device 306 may include at least one speaker, at least one display, a communication device for at least one other device, or a combination thereof. As an example, the notification device 306 may notify the remote controller 307 that various settings are received or that the operation (such as water heating) to receive a reservation is completed. In addition, when an abnormality occurs in the hot water supply device 200, the notification device 306 may notify the occurrence of the abnormality.
The remote controller 307 is a controller prepared separately from the main body of the hot water supply apparatus 200, receives input of various operations by a user, and outputs the received input to the controller 250. In one aspect, the remote controller 307 may be integrated with the hot water supply device 200. The operation of the hot water supply apparatus 200 described with reference to fig. 4 to 8 may be realized by controlling the hot water supply apparatus 200 by the controller 250 shown in fig. 3. The operations shown in fig. 4 to 8 ensure safety for the user when the circulation pump 207 of the hot water supply device 200 described in fig. 2 is turned ON (ON) in a failure.
[ outline of operation of the hot water supply device 200 in the hot water supply mode ]
Fig. 4 is a diagram schematically showing an example of the operation of the hot water supply device 200 in the hot water supply mode. Referring to fig. 4, a description will be given of how the CPU 301 controls the hot water supply apparatus 200 based on the temperature setting and the operation mode setting received by the remote controller 307.
First, an operation of the hot water supply apparatus 200 in the hot water supply mode will be described. The hot water supply mode is generally a mode when a user uses warm water flowing out from the hot water supply plug 140. When the hot water supply device 200 is operated in the hot water supply mode, warm water heated by the heat exchanger 204 flows out of the hot water supply plug 140 when the valve 120 is opened. While using the warm water heated by the hot water supply device 200, water is supplied from the water supply pipe 110 to the hot water supply device 200 at any time. Arrows 400 in the figure indicate the flow direction of water and warm water in the hot water supply mode.
Next, an operation of the CPU 301 when the remote controller 307 receives an operation of temperature setting when the hot water supply device 200 is operated in the hot water supply mode will be described. When the hot water supply device 200 is operated in the hot water supply mode, if the remote controller 307 receives input of a high temperature setting (for example, a setting to 70 ℃), the CPU 301 controls the heat exchanger 204 so that the temperature of the hot water flowing out from the hot water supply device 200 becomes the temperature as the received setting.
The hot water supply mode is a mode based on the use of hot water, and it is assumed that the user understands that hot water having a high temperature flows out from the hot water supply plug 140. In addition, as indicated by arrow 400, when valve 120 is opened, warm water flowing out of port 213 does not flow into port 211. Therefore, it is considered that the possibility of the user being scalded is small, and therefore, the CPU 301 controls the hot water supply device 200 so that the temperature of the hot water becomes the temperature setting as received.
Next, an operation of the CPU 301 when the remote controller 307 receives an input operation in the real-time hot water circulation mode when the hot water supply apparatus 200 is operated in the hot water supply mode will be described. The CPU 301 may take two actions.
In the first operation, when receiving an input operation in the real-time hot water circulation mode, the CPU 301 determines whether or not the temperature setting of the hot water flowing out from the current hot water supply device 200 is equal to or higher than a predetermined limit temperature (Th 1). When it is determined that the temperature of the hot water flowing out from the current hot water supply device 200 is equal to or higher than the predetermined limit temperature (Th 1), the CPU 301 changes the temperature setting to the limit temperature (Th 1). When it is determined that the temperature setting of the hot water flowing out from the current hot water supply device 200 is less than the predetermined limit temperature (Th 1), the CPU 301 does not change the temperature setting. Next, the CPU 301 shifts the hot water supply device 200 to the real-time hot water circulation mode in a state where the set temperature is equal to or lower than the limiting temperature (Th 1).
The limiting temperature (Th 1) here is, for example, about 48 ℃. The temperature of 48℃is an example, and the limiting temperature (Th 1) is not limited thereto. The limiting temperature (Th 1) may be a temperature at which the user does not get burned when using the hot water flowing from the hot water supply plug 140.
By operating the hot water supply device 200 based ON the first operation, even when the circulation pump 207 is turned ON (ON) and the valve 130 is opened by the user (the supply of water is expected) and warm water flows out from the hot water supply plug 140, the temperature of the warm water is not higher than the limit temperature (Th 1), and the user is not scalded.
In one aspect, after the end of the real-time hot water circulation mode, the CPU 301 may return the set temperature to the original temperature in a state where the flow detector 202 no longer detects the flow of the hot water (in a state where it is confirmed that the circulation pump 207 has stopped).
In the second operation, when receiving an input operation in the real-time hot water circulation mode, the CPU 301 determines whether or not the temperature setting of the hot water flowing out from the current hot water supply device 200 is equal to or higher than a predetermined limit temperature (Th 1).
When it is determined that the temperature setting of the hot water flowing out from the current hot water supply device 200 exceeds the predetermined limit temperature (Th 1), the CPU 301 does not shift the hot water supply device 200 to the real-time hot water circulation mode. When it is determined that the temperature of the hot water flowing out from the current hot water supply device 200 is equal to or lower than the predetermined limit temperature (Th 1), the CPU 301 shifts the hot water supply device 200 to the real-time hot water circulation mode. In one aspect, the CPU 301 may notify the user from the notification device 306 that the hot water supply device 200 cannot be shifted to the real-time hot water circulation mode without shifting the hot water supply device 200 to the real-time hot water circulation mode.
The hot water supply device 200 is operated based on the second operation, so that the hot water supply device 200 does not shift to the real-time hot water circulation mode at a set temperature exceeding the limit temperature (Th 1). Therefore, even if the hot water supply apparatus 200 is in the real-time hot water circulation mode, the circulation pump 207 is turned ON (ON) and the user is not scalded.
[ outline of operation of the hot water supply device 200 in real-time Hot Water circulation mode ]
Fig. 5 is a diagram showing an example of an outline of the operation of the hot water supply device 200 in the real-time hot water circulation mode. With reference to fig. 5, the operation at the end of the real-time hot water circulation mode in the first operation described in fig. 4 will be described.
First, an operation of the hot water supply apparatus 200 in the real-time hot water circulation mode will be described. The circulation pump 207 operates in a real-time hot water circulation mode. In addition, the valve 120 is closed normally without the hot water supply plug 140. Accordingly, the warm water circulates in the hot water supply device 200 in the flow direction indicated by the arrow 500.
Next, an operation of the hot water supply apparatus 200 at the end of the real-time hot water circulation mode will be described. The CPU 301 causes the hot water supply device 200 to end the real-time hot water circulation mode based on the temperature of the warm water during circulation reaching the set temperature. The CPU 301 may determine whether the temperature of the warm water during the circulation process reaches the set temperature based on the detection result of the temperature detector 203 or the temperature detector 205.
The CPU 301 causes the hot water supply apparatus 200 to end the real-time hot water circulation mode based on the following procedure. As a first step, the CPU 301 changes the operation mode of the hot water supply device 200 stored in the memory 302 from the real-time hot water circulation mode to another mode (standby mode or the like). As a second step, the CPU 301 stops the circulation pump 207. As a third step, the CPU 301 refers to the detection value of the flow rate detector 202 periodically for a predetermined period of time until the flow rate of the warm water detected by the flow rate detector 202 is equal to or less than a predetermined threshold value. As a fourth step, the CPU 301 determines that the circulation pump 207 has stopped based on the flow rate of the warm water detected by the flow rate detector 202 being equal to or less than a predetermined threshold (based on the termination of the flow direction of the determined arrow 500) for a predetermined period. As a fifth step, the CPU 301 returns the set temperature to the original temperature (returns the current set temperature to the set temperature input by the user) when the set temperature input by the user is equal to or higher than the limiting temperature (Th 1).
Fig. 6 is a diagram showing an example of an outline of the operation of the hot water supply apparatus 200 when the circulation pump 207 is turned ON (ON) in the real-time hot water circulation mode. With reference to fig. 6, the operation at the end of the real-time hot water circulation mode when the ON (ON) fault occurs in the circulation pump 207 in the first operation described in fig. 4 will be described.
The first to third steps are the same as those described with reference to fig. 5. In the fourth step, when the ON (ON) fault occurs in the circulation pump 207, the circulation pump 207 continues to operate, and therefore the flow rate of the warm water detected by the flow rate detector 202 does not become equal to or less than the predetermined threshold value for a predetermined period. When the circulation pump 207 is turned ON (ON) and the valve 120 is opened by the user, warm water flows out from the hot water supply plug 140 as indicated by an arrow 600. In the case where the flow of warm water continues even when a certain period of time has elapsed as described above, the CPU 301 determines that the circulation pump 207 has an ON (ON) failure. As a fifth step, the CPU 301 causes the notification device 306 to notify a message that the transfer circulation pump 207 has failed. The user can find an abnormality in the hot water supply device 200 by referring to the notification content from the notification device 306, and can communicate with a service person or the like.
[ sequence of operation of the Hot Water supply device 200 ]
Fig. 7 is a diagram showing an example of the first operation in the real-time hot water circulation mode of the hot water supply apparatus 200. The process shown in fig. 7 is a process flow of the CPU 301 when the first operation described in fig. 4 to 6 is implemented. In some aspect, the CPU 301 may read a program to perform the processing of fig. 7 from the memory 302 and execute the program. In another aspect, some or all of the processing may also be implemented in the form of a combination of circuit elements configured to perform the processing.
In step S705, when the CPU 301 enters the real-time hot water circulation mode, the set temperature of the hot water supply is set to be equal to or lower than the limiting temperature (Th 1). When the original set temperature (T) exceeds the limit temperature (Th 1), the CPU 301 changes the set temperature from the original set temperature (T) to the limit temperature (Th 1). If this is not the case, the CPU 301 maintains the set temperature at the original set temperature (T). When changing the set temperature to the limiting temperature (Th 1), the CPU 301 saves the original information of the set temperature (T) in the memory 302 for the processing of step S745.
In step S710, the CPU 301 outputs an ON (ON) instruction to the circulation pump 207. The circulation pump 207 operates when an ON (ON) command is input from the CPU 301, and circulates warm water. In some aspects, the ON (ON) command may be a digital signal or an analog signal. ON the other hand, the CPU 301 may output an ON command to the electronic circuit 303, and the electronic circuit 303 to which the ON command is input directly controls the circulation pump 207.
In step S715, when it is determined that the temperature of the hot water during the circulation has reached the set temperature based on the detection results of the temperature detector 203 and the temperature detector 205, the CPU 301 changes the state of the hot water supply device 200 to the real-time hot water circulation end. In step S705, when the CPU 301 sets the set temperature to the limit temperature (Th 1), the CPU 301 changes the state of the hot water supply device 200 to the real-time hot water cycle end based on the temperature of the hot water during the cycle reaching the limit temperature (Th 1).
In some aspects, the CPU 301 may store the state of the hot water supply device 200 (hot water supply standby, during hot water supply, real-time hot water standby, during real-time hot water circulation, and end of real-time hot water circulation, etc.) in the memory 302. In this case, the CPU 301 manages the state of the hot water supply apparatus 200 by rewriting the state of the hot water supply apparatus 200 on the memory 302.
In step S720, the CPU 301 outputs an OFF (OFF) instruction to the circulation pump 207. The circulation pump 207 is stopped when a disconnection (OFF) instruction is input from the CPU 301. If the circulation pump 207 is stopped, the warm water during circulation is not recirculated soon after. In some aspects, the OFF command may be a digital signal or an analog signal. On the other hand, the CPU 301 may output an OFF command to the electronic circuit 303, and the electronic circuit 303 to which the OFF command is input may stop the circulation pump 207.
In step S725, the CPU 301 determines whether the counter is equal to or less than an upper limit value (N). Based on the value of the counter, the CPU 301 determines whether or not a predetermined period (count number N) has elapsed from the start of counting. The value of the counter is used to determine whether the process of step S735 has timed out. When the determination is made that the counter is equal to or less than the upper limit value (N) (YES in step S725), the CPU 301 moves control to step S730. If this is not the case (NO in step S725), the CPU 301 moves control to step S750.
In step S730, the CPU 301 increments. In step S735, the CPU 301 determines whether the flow detector 202 no longer detects water flow. That is, the CPU 301 determines whether the circulation of the warm water has stopped. If it is determined that the flow detector 202 is no longer detecting the water flow (YES in step S735), the CPU 301 moves control to step S740. If this is not the case (NO in step S735), the CPU 301 moves control to step S725.
In step S740, the CPU 301 determines that the circulation pump 207 has stopped normally, and releases the limitation of the set temperature. In step S705, when the CPU 301 has changed the set temperature from the original set temperature (T) to the limit temperature (Th 1), the CPU 301 returns the set temperature to the original set temperature (T).
In step S745, the CPU 301 controls the heat exchanger 204 so that the warm water becomes the original set temperature (T). In step S750, the CPU 301 determines that the circulation pump 207 is not stopped normally, and outputs an alarm from the notification device 306.
Fig. 8 is a diagram showing an example of a second operation of the hot water supply device 200. The process shown in fig. 8 is a flow of processing of the CPU 301 when the second operation described in fig. 4 is implemented. In some aspect, the CPU 301 may read a program to perform the processing of fig. 8 from the memory 302 and execute the program. In another aspect, some or all of the processing may be implemented in the form of a combination of circuit elements configured to perform the processing.
In step S805, the CPU 301 sets the state of the hot water supply apparatus 200 to the hot water supply standby mode. In step S810, the CPU 301 accepts a command of real-time hot water ON (ON). In some aspect, the CPU 301 may accept a command to turn ON (ON) real-time hot water based ON the real-time hot water switch of the remote controller 307 having been pressed. ON the other hand, the CPU 301 may receive a real-time hot water ON (ON) command by pressing a button or the like of the hot water supply apparatus 200 body.
In step S815, the CPU 301 determines whether or not the set temperature of the hot water supply is equal to or lower than the limiting temperature (Th 1) when entering the real-time hot water circulation mode. When it is determined that the set temperature of the hot water supply is equal to or lower than the limiting temperature (Th 1) (YES in step S815), the CPU 301 moves the control to step S820. In the case where this is not the case (NO in step S815), the CPU 301 moves control to step S810. In some aspect, when control is returned to step S810, the CPU 301 may notify the user that the real-time hot water circulation mode is not entered from the notification device 306.
In step S820, the CPU 301 sets the state of the hot water supply device 200 to the real-time hot water standby mode. In step S825, the CPU 301 determines whether the hot water supply device 200 satisfies the combustion start condition. As an example, the combustion start condition includes whether the current temperature of the hot water is lower than the set temperature, whether the circulation pump 207 is reacting, and the like. When it is determined that the hot water supply device 200 satisfies the combustion start condition (YES in step S825), the CPU 301 moves control to step S830. If this is not the case (NO in step S825), the CPU 301 moves control to step S820. In some aspect, when the CPU 301 returns control to step S820, it may notify the user that the hot water supply device 200 does not satisfy the combustion start condition from the notification device 306.
In step S830, the CPU 301 outputs an ON (ON) instruction to the circulation pump 207. The circulation pump 207 operates when an ON (ON) command is input from the CPU 301, and circulates warm water.
In step S835, after the real-time hot water cycle starts, the CPU 301 sets the upper limit of the set temperature of the hot water supply to the limit temperature (Th 1) or lower. That is, when the hot water supply device 200 is operating in the real-time hot water circulation mode, the CPU 301 does not receive an input of a temperature setting higher than the limit temperature (Th 1).
In step S840, the CPU 301 sets the state of the hot water supply device 200 to the real-time hot water circulation end, based on the temperature of the warm water during circulation reaching the set temperature. In step S845, the CPU 301 outputs an OFF (OFF) instruction to the circulation pump 207. The circulation pump 207 is stopped when a disconnection (OFF) instruction is input from the CPU 301. In step S850, the CPU 301 releases the upper limit setting of the set temperature of the hot water supply set in step S835. After the upper limit setting of the set temperature is released, the CPU 301 may accept an input of a temperature setting higher than the limit temperature (Th 1).
[ other device Structure ]
Fig. 9 is a view showing another example of the hot water supply device not including the circulation port. In comparison with the hot water supply apparatus 200, the hot water supply apparatus 900 includes a path which bypasses upstream and downstream of the circulation pump 207, a flow rate detector 901 provided in the path, and a valve 902 for preventing backflow.
When the flow detector 202 detects the flow of water or warm water after the end of the real-time hot water circulation mode, the controller 250 can determine whether the circulation pump 207 is malfunctioning or the user opens the valve 120 to allow warm water to flow out of the hot water supply plug 140 by including the flow detector 901 in the hot water supply device 900.
Specifically, in the case where the controller 250 turns OFF (OFF) the circulation pump 207, the controller 250 may determine that an ON (ON) fault has occurred in the circulation pump 207 when the flow detector 202 detects the water flow and the flow detector 901 does not detect the water flow. The reason is that: during the operation of the circulation pump 207, water or warm water is sucked by the circulation pump 207, and thus flows into the circulation pump 207 preferentially over the flow rate detector 901, and as a result, the flow rate detector 901 hardly detects the water flow.
In contrast, when the controller 250 turns OFF (OFF) the circulation pump 207, and when both the flow rate detector 202 and the flow rate detector 901 detect the water flow, the controller 250 may determine that the circulation pump 207 is not turned ON (ON) or ON (the user opens the valve 120 to allow the warm water to flow out of the hot water supply plug 140). The reason is that: when the circulation pump 207 is stopped and the user opens the valve 120 to allow the hot water to flow out of the hot water supply plug 140, the water or the hot water does not preferentially flow into the circulation pump 207, and as a result, the water or the hot water also flows into the flow rate detector 901.
As described above, the hot water supply device 200 according to the present embodiment heats the hot water in a range equal to or less than the predetermined limit temperature in the real-time hot water circulation mode. Alternatively, when the set temperature of the hot water supply exceeds the predetermined limit temperature, the hot water supply device 200 does not shift to the real-time hot water circulation mode. By the control, the temperature of the warm water in the real-time hot water circulation mode and at the end of the real-time hot water circulation mode is limited to a temperature to such an extent that the user is not scalded. Therefore, even if the user opens the valve 130 when the circulation pump 207 fails, the user is not scalded.
The features of the technology disclosed above can be summarized as follows.
(configuration 1) the hot water supply device according to an embodiment includes: a first piping connected to the water inlet; a flow rate detector for detecting a flow rate of water in the first pipe; a heating mechanism for heating water flowing in from the first pipe; and a second pipe through which the warm water heated by the heating means flows. The second pipe is connected to the first pipe via an external third pipe. The hot water supply device further includes a circulation pump which is disposed on the path of the first pipe and which, when operated, feeds out the hot water in the third pipe in the direction of the heating mechanism, and a control device which controls the circulation pump and the heating mechanism. The control device operates the circulation pump based on the execution command received in the real-time hot water circulation mode, and adjusts the heating temperature of the heating means so that the temperature of the hot water in the real-time hot water circulation mode becomes equal to or lower than the limit temperature when the setting of the hot water outflow temperature exceeds the predetermined limit temperature.
(structure 2) a hot water supply apparatus according to another embodiment includes: a first piping connected to the water inlet; a flow rate detector for detecting a flow rate of water in the first pipe; a heating mechanism for heating water flowing in from the first pipe; and a second pipe through which the warm water heated by the heating means flows. The second pipe is connected to the first pipe via an external third pipe. The hot water supply device further includes a circulation pump which is disposed on the path of the first pipe and which, when operated, feeds out the hot water in the third pipe in the direction of the heating mechanism, and a control device which controls the circulation pump and the heating mechanism. The control device determines whether or not the setting of the hot water outflow temperature is equal to or lower than a predetermined limit temperature based on receiving the execution command of the real-time hot water circulation mode, and causes the hot water supply device to operate in the real-time hot water circulation mode based on the setting of the hot water outflow temperature being equal to or lower than the limit temperature.
(configuration 3) the hot water supply device according to the aspect includes, in addition to configuration 2, a notification device that notifies the user of the fact that the real-time hot water circulation mode is not entered, based on the setting of the hot water outflow temperature exceeding the limit temperature.
(structure 4) the hot water supply apparatus according to still another embodiment includes: a first piping connected to the water inlet; a flow rate detector for detecting a flow rate of water in the first pipe; a heating mechanism for heating water flowing in from the first pipe; and a second pipe through which the warm water heated by the heating means flows. The second pipe is connected to the first pipe via an external third pipe. The hot water supply device further includes a circulation pump which is disposed on the path of the first pipe and which, when operated, feeds out the hot water in the third pipe in the direction of the heating mechanism, and a control device which controls the circulation pump and the heating mechanism. The control device limits the heating temperature of the heating means so that the temperature of the warm water during circulation becomes equal to or lower than a predetermined limit temperature based on the operation of the hot water supply device in the real-time hot water circulation mode, stops the circulation pump, ends the real-time hot water circulation mode, determines that the circulation of the warm water is ended based on the detected flow rate obtained by the flow rate detector being less than the first flow rate after the real-time hot water circulation mode is ended, and releases the limit of the heating temperature of the heating means based on the determined end of the circulation of the warm water.
(configuration 5) the hot water supply device according to the aspect includes, in addition to configuration 4, a memory that stores the setting of the hot water supply device, and the control device receives input of the setting of the hot water outflow temperature from the remote controller and saves the input setting of the hot water outflow temperature in the memory. The restriction on the heating temperature of the release heating mechanism includes: when receiving an input of a temperature setting exceeding the limit temperature, after the real-time hot water circulation mode is completed, the heating temperature of the heating means is raised based on the setting of the hot water outflow temperature read from the memory.
The hot water supply device according to the aspect of the present invention includes, in addition to the configuration 4, a notification device that notifies the user of information, and the notification device notifies a failure in which the circulation pump is not stopped, that is, a failure in the hot water supply device, based on that the detected amount of flow rate obtained by the flow rate detector is less than the first flow rate even when a predetermined time elapses from the end of the real-time hot water circulation mode.
(structure 7) the hot water supply device according to an aspect includes, in addition to the structure 4: a fourth pipe bypassing the first pipe on the upstream side of the circulation pump and the downstream side of the circulation pump; and another flow rate detector provided on the path of the fourth pipe, wherein the control device detects a failure of the circulation pump based on the fact that the flow rate detected by the other flow rate detector is less than the second flow rate when the real-time hot water circulation mode is completed and the detected amount of the flow rate obtained by the flow rate detector is equal to or greater than the first flow rate.
(configuration 8) the hot water supply device according to the aspect, except any one of configurations 1 to 7, has a limit temperature of the maximum set temperature of the hot water in the real-time hot water circulation mode.
(configuration 9) the hot water supply device according to the aspect is configured such that, in addition to any one of configurations 1 to 8, a valve is disposed on a path of the third pipe, the valve restricting a flow direction of the hot water in the third pipe from the second pipe toward the first pipe.
(configuration 10) the hot water supply device according to the aspect includes, in addition to any one of configurations 1 to 9: a fifth pipe connecting the second pipe to the downstream side of the circulation pump in the first pipe; and a flow rate adjustment device for adjusting the amount of water flowing from the first pipe into the second pipe via the fifth pipe.
The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein. The invention described in the embodiments and the modifications is intended to be implemented as individually or in combination as possible.

Claims (2)

1. A hot water supply apparatus comprising:
a first piping connected to the water inlet;
a flow rate detector for detecting a flow rate of water in the first pipe;
a heating mechanism for heating the water flowing in from the first pipe; and
a second piping through which the warm water heated by the heating means flows,
the second pipe is connected to the first pipe via an external third pipe,
the hot water supply apparatus further includes:
a circulation pump which is disposed on the path of the first pipe and which, when in operation, sends out the warm water in the third pipe in the direction of the heating mechanism; and
a control device for controlling the circulating pump and the heating mechanism,
the control device determines whether the setting of the hot water outflow temperature is below a preset limit temperature based on the receiving of the execution command of the real-time hot water circulation mode,
and operating the hot water supply device in a real-time hot water circulation mode based on the setting of the hot water outflow temperature to be equal to or lower than the limit temperature, wherein the limit temperature is a temperature which does not cause scalding.
2. A hot water supply apparatus comprising:
a first piping connected to the water inlet;
a flow rate detector for detecting a flow rate of water in the first pipe;
A heating mechanism for heating the water flowing in from the first pipe; and
a second piping through which the warm water heated by the heating means flows,
the second pipe is connected to the first pipe via an external third pipe,
the hot water supply apparatus further includes:
a circulation pump which is disposed on the path of the first pipe and which, when in operation, sends out the warm water in the third pipe in the direction of the heating mechanism; and
a control device for controlling the circulating pump and the heating mechanism,
the control device limits the heating temperature of the heating mechanism based on the hot water supply device in a real-time hot water circulation mode so that the temperature of the warm water in the circulation process is below a preset limit temperature, wherein the limit temperature is a temperature which does not cause scalding,
stopping the circulating pump to finish the real-time hot water circulating mode,
after the end of the real-time hot water circulation mode, determining that circulation of the hot water is ended based on the detected amount of the flow rate obtained by the flow rate detector being less than the first flow rate,
and releasing the limitation of the heating temperature of the heating mechanism based on the judgment of the end of the circulation of the warm water.
CN202011093938.4A 2019-11-26 2020-10-14 Hot water supply device Active CN112856543B (en)

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