A tap water preheating water saving device and its using method

Abstract

The application discloses a tap water preheating water-saving device and a use method thereof. The device comprises an electrically-controlled three-way switching valve A, a hot water circulating pump, an electrically-controlled three-way switching valve B, a water heater, a central control device, an electrically-controlled three-way switching valve C, an electrically-controlled three-way switching valve D and a temperature-adjustable faucet. The electrically-controlled three-way switching valve A, the hot water circulating pump, the electrically-controlled three-way switching valve B, the electrically-controlled three-way switching valve C, the electrically-controlled three-way switching valve D and the temperature-adjustable faucet are connected with the central control device. The electrically-controlled three-way switching valve A can be connected with the hot water circulating pump and the electrically-controlled three-way switching valve C. The electrically-controlled three-way switching valve B can be connected with the hot water circulating pump and the water heater. The water heater can be connected with the electrically-controlled three-way switching valve D. The electrically-controlled three-way switching valve D can be connected with the electrically-controlled three-way switching valve C and the temperature-adjustable faucet. The electrically-controlled three-way switching valve C can be connected with the temperature-adjustable faucet. The application can realize automatic measurement of tap water temperature and recycling of cold water, and achieves the purpose of water saving.

Description

Technical Field

[0001] This invention belongs to the technical field, specifically relating to a tap water preheating and water-saving device and its usage method. Background Technology

[0002] Whether in the workplace, hotel, or home, when obtaining hot water using methods such as gas, it is often necessary to wait several seconds or tens of seconds, allowing cold water to escape, resulting in a waste of water resources.

[0003] Therefore, this invention discloses a tap water preheating and water-saving device and its usage method, which realizes the recycling of cold water and achieves the purpose of water saving. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the purpose of this invention is to provide a tap water preheating and water-saving device and its usage method.

[0005] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows:

[0006] A tap water preheating and water-saving device includes an electrically controlled three-way switching valve A, a hot water circulation pump, an electrically controlled three-way switching valve B, a water heater, a central control device, an electrically controlled three-way switching valve C, an electrically controlled three-way switching valve D, and an adjustable temperature faucet. The electrically controlled three-way switching valve A, hot water circulation pump, electrically controlled three-way switching valve B, electrically controlled three-way switching valve C, electrically controlled three-way switching valve D, and the adjustable temperature faucet are all connected to the central control device. The electrically controlled three-way switching valve A can be connected to the hot water circulation pump and the electrically controlled three-way switching valve C. The electrically controlled three-way switching valve B can be connected to the hot water circulation pump and the water heater. The water heater can be connected to the electrically controlled three-way switching valve D. The electrically controlled three-way switching valve D can be connected to the electrically controlled three-way switching valve C and the adjustable temperature faucet. The electrically controlled three-way switching valve C can be connected to the adjustable temperature faucet.

[0007] Furthermore, the electrically controlled three-way switching valve A includes an electrically controlled three-way switching valve A interface one, an electrically controlled three-way switching valve A interface two, and an electrically controlled three-way switching valve A interface three. The electrically controlled three-way switching valve A is connected to the central control device through an electrically controlled three-way switching valve A control circuit. The central control device controls the on / off states of electrically controlled three-way switching valve A interface one, electrically controlled three-way switching valve A interface two, and electrically controlled three-way switching valve A interface three through the electrically controlled three-way switching valve A control circuit.

[0008] Furthermore, the hot water circulation pump is provided with a hot water circulation pump inlet and a hot water circulation pump outlet. The hot water circulation pump inlet is connected to an electrically controlled three-way switching valve A, and the hot water circulation pump outlet is connected to an electrically controlled three-way switching valve B. The hot water circulation pump is connected to a central control device through a hot water circulation pump control circuit, and the central control device controls the working status of the hot water circulation pump through the hot water circulation pump control circuit.

[0009] Furthermore, the electrically controlled three-way switching valve B includes an electrically controlled three-way switching valve B interface one, an electrically controlled three-way switching valve B interface two, and an electrically controlled three-way switching valve B interface three. The electrically controlled three-way switching valve B is connected to the central control device through the electrically controlled three-way switching valve B control circuit. The central control device 5 controls the on / off state of the electrically controlled three-way switching valve B interface one, electrically controlled three-way switching valve B interface two, and electrically controlled three-way switching valve B interface three through the electrically controlled three-way switching valve B control circuit.

[0010] Furthermore, the water heater is provided with a water heater inlet and a water heater outlet. The water heater inlet is connected to an electrically controlled three-way switching valve B, and the water heater outlet is connected to an electrically controlled three-way switching valve D.

[0011] Furthermore, the outlet of the water heater is connected to the interface of the electrically controlled three-way switching valve D, and a hot water temperature sensor is installed between the two. The hot water temperature sensor is connected to the central control device through a hot water temperature feedback signal line.

[0012] Furthermore, the electrically controlled three-way switching valve C includes an electrically controlled three-way switching valve C interface one, an electrically controlled three-way switching valve C interface two, and an electrically controlled three-way switching valve C interface three. The electrically controlled three-way switching valve C is connected to the central control device through an electrically controlled three-way switching valve C control circuit. The central control device controls the on / off state of the electrically controlled three-way switching valve C interface one, electrically controlled three-way switching valve C interface two, and electrically controlled three-way switching valve C interface three through the electrically controlled three-way switching valve C control circuit.

[0013] Furthermore, the electrically controlled three-way switching valve D includes an electrically controlled three-way switching valve D interface one, an electrically controlled three-way switching valve D interface two, and an electrically controlled three-way switching valve D interface three. The electrically controlled three-way switching valve D is connected to a central control device through an electrically controlled three-way switching valve D control circuit. The central control device controls the on / off states of electrically controlled three-way switching valve D interface one, electrically controlled three-way switching valve D interface two, and electrically controlled three-way switching valve D interface three through the electrically controlled three-way switching valve D control circuit.

[0014] Furthermore, the adjustable temperature faucet includes a cold water pipe, a hot water pipe, and an adjustable temperature faucet contact switch. The adjustable temperature faucet contact switch is connected to the central control device via an adjustable temperature faucet contact switch signal line. When the adjustable temperature faucet is opened, the adjustable temperature faucet contact switch is triggered, and a command is sent to the central control device via the adjustable temperature faucet contact switch signal line.

[0015] This invention discloses a method for using a tap water preheating and water-saving device, comprising the following steps:

[0016] When the adjustable temperature faucet is turned on, the water heater automatically turns on due to the impact of the water flow. Simultaneously, the adjustable temperature faucet's contact switch is triggered, transmitting a signal to the central control unit via its signal line. The central control unit then simultaneously issues commands through the hot water circulation pump control circuit, the electric three-way switching valve B control circuit, the electric three-way switching valve A control circuit, the electric three-way switching valve C control circuit, and the electric three-way switching valve D control circuit. These commands cause the hot water circulation pump, electric three-way switching valve B, electric three-way switching valve A, electric three-way switching valve C, and electric three-way switching valve D to operate in coordination according to their respective commands at the same time.

[0017] The control circuit of the electrically controlled three-way switching valve A controls the closure of port 1, the opening of port 2, and the opening of port 3 of the electrically controlled three-way switching valve A, so that the water flows from port 2 into port 3, and then from port 3 to the inlet of the hot water circulation pump.

[0018] The hot water circulation pump is started by controlling the hot water circulation pump control circuit, so that the water flows into the hot water circulation pump through the hot water circulation pump inlet, and then flows out of the hot water circulation pump outlet to the B port of the electric three-way switching valve.

[0019] The control circuit of the electric three-way switching valve B controls the opening of the two ports of the electric three-way switching valve B and the three ports of the electric three-way switching valve B, and the closing of the one port of the electric three-way switching valve B. This allows water to flow into the two ports of the electric three-way switching valve B, and then out from the three ports of the electric three-way switching valve B. The water then flows through the inlet of the water heater to the water heater. After being heated by the water heater, the water flows from the outlet of the water heater to the one port of the electric three-way switching valve D. At this time, a hot water temperature sensor is installed at one port of the electric three-way switching valve D to test the water temperature.

[0020] The control circuit of the electrically controlled three-way switching valve D controls the three-way switching valve D interface 3 to close, the one-way switching valve D interface 1 to open, and the two-way switching valve D interface 2 to open, so that water flows in from the one-way switching valve D interface 1 and out from the two-way switching valve D interface 2, and flows to the three-way switching valve C interface 3 of the electrically controlled three-way switching valve C.

[0021] The control circuit of the electrically controlled three-way switching valve C7 controls the two ports of the electrically controlled three-way switching valve C7 to be closed, the one port of the electrically controlled three-way switching valve C7 to be opened, and the three ports of the electrically controlled three-way switching valve C7 to be opened. This causes water to flow in from the three ports of the electrically controlled three-way switching valve C7 and out from the one port of the electrically controlled three-way switching valve C7. The water then flows in the opposite direction from the one port of the electrically controlled three-way switching valve C7 to the two ports of the electrically controlled three-way switching valve A7. After passing through the three ports of the electrically controlled three-way switching valve A7 and the inlet of the hot water circulation pump, the water flows into the hot water circulation pump. This causes the tap water to circulate through the water heater and heat the tap water under the action of the hot water circulation pump.

[0022] When the hot water temperature sensor detects that the water temperature has reached the set temperature, the central control unit sends a command to the electric three-way switching valve A via the control circuit of the electric three-way switching valve A, opening interface 1 and interface 2 of the electric three-way switching valve A and closing interface 3 of the electric three-way switching valve A. This allows water to flow from interface 1 to interface 2 of the electric three-way switching valve A and then to interface 1 of the electric three-way switching valve C. Simultaneously, the hot water circulation pump is shut down via the control circuit of the hot water circulation pump. At the same time, the control circuit of the electric three-way switching valve B closes interface 2 of the electric three-way switching valve B and closes interface 1 and interface 3 of the electric three-way switching valve B. When port three is opened, tap water flows from port one of the electric three-way switching valve B to port three of the electric three-way switching valve B, and then to the water heater inlet. At the same time, the control circuit of the electric three-way switching valve D controls port two of the electric three-way switching valve D to close, so that the heated water flows into port one of the electric three-way switching valve D, then through port three of the electric three-way switching valve D, and then flows out through the hot water pipe of the adjustable temperature faucet. At the same time, the control circuit of the electric three-way switching valve C controls port three of the electric three-way switching valve C to close, so that tap water flows from port one of the electric three-way switching valve C to port two of the electric three-way switching valve C, and finally flows out through the cold water pipe of the adjustable temperature faucet.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] This invention discloses a tap water preheating and water-saving device and its usage method, which can realize the automatic measurement of tap water temperature and the recycling of cold water, thereby achieving the purpose of water saving and successfully solving the problem of water waste caused by insufficient water temperature. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0026] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0027] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0028] like Figure 1 As shown, a water-saving device for preheating tap water includes an electrically controlled three-way switching valve A1, a hot water circulation pump 2, an electrically controlled three-way switching valve B 3, a water heater 4, a central control device 5, a hot water temperature sensor 6, an electrically controlled three-way switching valve C 7, an electrically controlled three-way switching valve D 8, and an adjustable temperature faucet 9. The electrically controlled three-way switching valve A1 includes an A-port 11, an A-port 2 12, and an A-port 3 13. The hot water circulation pump 2 is provided with a hot water circulation pump inlet 21 and a hot water circulation pump outlet 22. The electrically controlled three-way switching valve B... 3 includes an electrically controlled three-way switching valve B interface 1 31, an electrically controlled three-way switching valve B interface 2 32, and an electrically controlled three-way switching valve B interface 33. The water heater 4 is equipped with a water heater inlet 41 and a water heater outlet 42. The central control device 5 is equipped with a hot water circulation pump control circuit 51, an electrically controlled three-way switching valve B control circuit 52, an electrically controlled three-way switching valve A control circuit 53, an adjustable temperature faucet contact switch signal line 54, an electrically controlled three-way switching valve C control circuit 55, an electrically controlled three-way switching valve D control circuit 56, and a hot water temperature feedback signal line 57. The electrically controlled three-way switching valve C 7 includes an electrically controlled three-way switching valve C interface 1 71, an electrically controlled three-way switching valve C interface 2 72, and an electrically controlled three-way switching valve C interface 3 73. The electrically controlled three-way switching valve D... 8 includes an electrically controlled three-way switching valve D interface 1 81, an electrically controlled three-way switching valve D interface 2 82, and an electrically controlled three-way switching valve D interface 3 83; the adjustable temperature faucet 9 includes a cold water pipe 91, a hot water pipe 92, and an adjustable temperature faucet contact switch 93.

[0029] The electric three-way switching valve A1 is made of copper or 304 stainless steel. It is connected to the central control device 5 through the electric three-way switching valve A control line 53. The central control device 5 controls the on / off state of the three ports of the electric three-way switching valve A1, the electric three-way switching valve A port 11, the electric three-way switching valve A port 212, and the electric three-way switching valve A port 313 through the electric three-way switching valve A control line 53, thereby forcing a change in the water flow direction and making the entire system work normally.

[0030] The hot water circulation pump 2 is connected to the central control device 5 through the hot water circulation pump control circuit 51. The central control device 5 controls the working status of the hot water circulation pump 2 through the hot water circulation pump control circuit 51. The function of the hot water circulation pump 2 is to provide power for preheating circulation.

[0031] The electric three-way switching valve B3 is made of copper or 304 stainless steel. It is connected to the central control device 5 through the electric three-way switching valve B control circuit 52. The central control device 5 controls the on / off state of the three ports of the electric three-way switching valve B3—port 31, port 32, and port 33—through the electric three-way switching valve B control circuit 52, thereby forcing a change in the water flow direction and ensuring the normal operation of the entire system.

[0032] The function of water heater 4 is to use the water flow from water heater inlet 41 to water heater outlet 42 to sense and activate itself.

[0033] The hot water temperature sensor 6, which uses a K-type thermocouple, is located in the pipe between the water heater outlet 42 and the D-port 81 of the electric three-way switching valve. Its function is to test the water temperature data and transmit it to the central control device 5 in the form of an analog electrical signal through the hot water temperature feedback signal line 57.

[0034] The electric three-way switching valve C7 is made of copper or 304 stainless steel. It is connected to the central control device 5 through the electric three-way switching valve C control circuit 55. The central control device 5 controls the on / off state of the three ports of the electric three-way switching valve C port 1 71, electric three-way switching valve C port 2 72 and electric three-way switching valve C port 3 73 through the electric three-way switching valve C control circuit 55, thereby forcing a change in the water flow direction and making the entire system work normally.

[0035] The electric three-way switching valve D8 is made of copper or 304 stainless steel. It is connected to the central control device 5 through the electric three-way switching valve D control line 56. The central control device 5 controls the on / off state of the three ports of the electric three-way switching valve D interface 1 81, electric three-way switching valve D interface 2 82 and electric three-way switching valve D interface 3 83 through the electric three-way switching valve D control line 56, thereby forcing a change in the water flow direction and making the entire system work normally.

[0036] The adjustable temperature faucet 9 is made of 304 stainless steel. It can adjust the flow rate of cold and hot water from the cold water pipe 91 and the hot water pipe 92 to control the water temperature. When the adjustable temperature faucet 9 is opened, it triggers the adjustable temperature faucet contact switch 93, which sends the instruction to the central control device 5 through the adjustable temperature faucet contact switch signal line 54.

[0037] A method for using a tap water preheating and water-saving device includes the following steps:

[0038] When the adjustable temperature faucet 9 is opened, the water heater 4 automatically turns on under the impact of the water flow, triggering the adjustable temperature faucet contact switch 93. This signal is transmitted to the central control unit 5 via the adjustable temperature faucet contact switch signal line 54. The water temperature information detected by the hot water temperature sensor 6 is transmitted to the central control unit 5 via the hot water temperature feedback signal line 57 for processing. Simultaneously, the central control unit 5 issues commands through the hot water circulation pump control line 51, the electric three-way switching valve B control line 52, the electric three-way switching valve A control line 53, the electric three-way switching valve C control line 55, and the electric three-way switching valve D control line 56, respectively causing the hot water circulation pump 2, the electric three-way switching valve B3, the electric three-way switching valve A1, the electric three-way switching valve C7, and the electric three-way switching valve D8 to work in coordination according to the commands at the same time. Specifically:

[0039] The electric three-way switching valve A1 is closed by the control circuit 53 of the electric three-way switching valve A1, so that the water flows from the electric three-way switching valve A2 12 into the electric three-way switching valve A3 13, and then from the electric three-way switching valve A3 13 to the hot water circulation pump inlet 21.

[0040] The hot water circulation pump 2 is started by controlling the hot water circulation pump control circuit 51, so that the water flows into the hot water circulation pump 2 through the hot water circulation pump inlet 21, and then flows out from the hot water circulation pump outlet 22, flowing to the electronically controlled three-way switching valve B interface 2 32.

[0041] The electric three-way switching valve B control circuit 52 controls the opening of the electric three-way switching valve B port 2 32 of the electric three-way switching valve B 3, allowing water to flow into the electric three-way switching valve B port 2 32, and then flow out from the electric three-way switching valve B port 3 33. The water then flows to the water heater 4 through the water heater inlet 41. After being heated by the water heater 4, the water flows from the water heater outlet 42 to the electric three-way switching valve D port 1 81 of the electric three-way switching valve D 8. At this time, a hot water temperature sensor 6 is set at the electric three-way switching valve D port 1 81 to test the water temperature.

[0042] The control circuit 56 of the electric three-way switching valve D controls the closing of the electric three-way switching valve D port 3 83 of the electric three-way switching valve D 8, so that the water flows in from the electric three-way switching valve D port 1 81 and out from the electric three-way switching valve D port 2 82, flowing to the electric three-way switching valve C port 3 73 of the electric three-way switching valve C 7.

[0043] The control circuit 55 controls the electric three-way switching valve C 7 to close the electric three-way switching valve C port 2 72 and open the electric three-way switching valve C port 3 73, so that water flows in from the electric three-way switching valve C port 3 73 and flows out from the electric three-way switching valve C port 1 71. The water flows in reverse from the electric three-way switching valve C port 1 71 into the electric three-way switching valve A port 2 12, and then through the electric three-way switching valve A port 3 13 and the hot water circulation pump inlet 21 into the hot water circulation pump 2, so that the tap water circulates through the water heater 4 under the action of the hot water circulation pump 2 to heat the tap water.

[0044] When the hot water temperature sensor 6 detects that the water temperature has reached the set temperature, the central control device 5 sends a command to the electric three-way switching valve A1 via the electric three-way switching valve A control circuit 53, opening the electric three-way switching valve A port 11 and closing the electric three-way switching valve A port 3 13, allowing water to flow through the electric three-way switching valve A port 11 to the electric three-way switching valve A port 2 12 and then to the electric three-way switching valve C port 1 71; simultaneously, the hot water circulation pump 2 is shut off via the hot water circulation pump control circuit 51; simultaneously, the electric three-way switching valve B port 2 32 of the electric three-way switching valve B3 is closed via the electric three-way switching valve B control circuit 52, allowing tap water to flow from the electric three-way switching valve B port 1 31 to the electric three-way switching valve B port 3 33 and then to the water heater inlet 41 of the water heater 4; simultaneously, the electric three-way switching valve D is controlled via the electric three-way switching valve D control circuit 56. When the D port 2 82 of the electric three-way switching valve 8 is closed, the heated water flows into the D port 1 81 of the electric three-way switching valve, then through the D port 3 83 of the electric three-way switching valve, and flows out through the hot water pipe 92 of the adjustable temperature faucet 9. At the same time, the control circuit 55 of the electric three-way switching valve C controls the D port 3 73 of the electric three-way switching valve C to close, so that the tap water flows from the C port 1 71 of the electric three-way switching valve to the C port 2 72 of the electric three-way switching valve, and finally flows out through the cold water pipe 91 of the adjustable temperature faucet 9.

[0045] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0046] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A tap water preheating and water-saving device, characterized in that, The device includes an electrically controlled three-way switching valve A, a hot water circulation pump, an electrically controlled three-way switching valve B, a water heater, a central control device, an electrically controlled three-way switching valve C, an electrically controlled three-way switching valve D, and an adjustable temperature faucet. All three components—electrically controlled three-way switching valve A, hot water circulation pump, electrically controlled three-way switching valve B, electrically controlled three-way switching valve C, electrically controlled three-way switching valve D, and the adjustable temperature faucet. The electrically controlled three-way switching valve A includes an electrically controlled three-way switching valve A interface 1, an electrically controlled three-way switching valve A interface 2, and an electrically controlled three-way switching valve A interface 3. The electrically controlled three-way switching valve A is connected to a central control device through an electrically controlled three-way switching valve A control circuit. The central control device controls the on / off state of the electrically controlled three-way switching valve A interface 1, electrically controlled three-way switching valve A interface 2, and electrically controlled three-way switching valve A interface 3 through the electrically controlled three-way switching valve A control circuit. The hot water circulation pump is equipped with a hot water circulation pump inlet and a hot water circulation pump outlet. The hot water circulation pump inlet is connected to an electrically controlled three-way switching valve A, and the hot water circulation pump outlet is connected to an electrically controlled three-way switching valve B. The hot water circulation pump is connected to a central control device through a hot water circulation pump control circuit, and the central control device controls the working status of the hot water circulation pump through the hot water circulation pump control circuit. The electrically controlled three-way switching valve B includes an electrically controlled three-way switching valve B interface one, an electrically controlled three-way switching valve B interface two, and an electrically controlled three-way switching valve B interface three. The electrically controlled three-way switching valve B is connected to the central control device through the electrically controlled three-way switching valve B control line. The central control device (5) controls the on / off state of the electrically controlled three-way switching valve B interface one, the electrically controlled three-way switching valve B interface two, and the electrically controlled three-way switching valve B interface three through the electrically controlled three-way switching valve B control line. The water heater is provided with a water heater inlet and a water heater outlet. The water heater inlet is connected to an electrically controlled three-way switching valve B, and the water heater outlet is connected to an electrically controlled three-way switching valve D. The water heater outlet is connected to the interface of the electric three-way switching valve D, and a hot water temperature sensor is installed between the two. The hot water temperature sensor is connected to the central control device through a hot water temperature feedback signal line. The electrically controlled three-way switching valve C includes an electrically controlled three-way switching valve C interface one, an electrically controlled three-way switching valve C interface two, and an electrically controlled three-way switching valve C interface three. The electrically controlled three-way switching valve C is connected to a central control device through an electrically controlled three-way switching valve C control circuit. The central control device controls the on / off state of the electrically controlled three-way switching valve C interface one, electrically controlled three-way switching valve C interface two, and electrically controlled three-way switching valve C interface three through the electrically controlled three-way switching valve C control circuit. The electrically controlled three-way switching valve D includes an electrically controlled three-way switching valve D interface one, an electrically controlled three-way switching valve D interface two, and an electrically controlled three-way switching valve D interface three. The electrically controlled three-way switching valve D is connected to a central control device through an electrically controlled three-way switching valve D control circuit. The central control device controls the on / off state of electrically controlled three-way switching valve D interface one, electrically controlled three-way switching valve D interface two, and electrically controlled three-way switching valve D interface three through the electrically controlled three-way switching valve D control circuit.

2. The tap water preheating and water-saving device according to claim 1, characterized in that, The adjustable temperature faucet includes a cold water pipe, a hot water pipe, and an adjustable temperature faucet contact switch. The adjustable temperature faucet contact switch is connected to the central control device via an adjustable temperature faucet contact switch signal line. When the adjustable temperature faucet is opened, the adjustable temperature faucet contact switch is triggered, and a command is sent to the central control device via the adjustable temperature faucet contact switch signal line.

3. The method of using a tap water preheating and water-saving device according to claim 1 or 2, characterized in that, Includes the following steps: When the adjustable temperature faucet is turned on, the water heater is activated, triggering the faucet's contact switch. This signal is transmitted to the central control unit via the faucet's signal line. The central control unit then simultaneously issues commands through the hot water circulation pump control circuit, the electric three-way valve B control circuit, the electric three-way valve A control circuit, the electric three-way valve C control circuit, and the electric three-way valve D control circuit. These commands cause the hot water circulation pump, electric three-way valve B, electric three-way valve A, electric three-way valve C, and electric three-way valve D to operate in coordination according to their respective commands at the same time. The control circuit of the electric three-way switching valve A controls the closure of port 1 of the electric three-way switching valve A, so that the water flows from port 2 of the electric three-way switching valve A into port 3 of the electric three-way switching valve A, and then from port 3 of the electric three-way switching valve A to the inlet of the hot water circulation pump. The hot water circulation pump is started by controlling the hot water circulation pump control circuit, so that the water flows into the hot water circulation pump through the hot water circulation pump inlet, and then flows out of the hot water circulation pump outlet to the B port of the electric three-way switching valve. The control circuit of the electric three-way switching valve B controls the opening of the second port of the electric three-way switching valve B, allowing water to flow into the second port of the electric three-way switching valve B, and then flow out from the third port of the electric three-way switching valve B. The water then flows to the water heater through the inlet and is heated by the water heater. The water then flows from the outlet of the water heater to the first port of the electric three-way switching valve D. At this time, a hot water temperature sensor is installed at the first port of the electric three-way switching valve D to test the water temperature. The control circuit of the electric three-way switching valve D controls the closure of the three-way switching valve D interface 3, so that the water flows in from the one-way switching valve D interface 1, flows out from the two-way switching valve D interface 2, and flows to the three-way switching valve C interface 3 of the electric three-way switching valve C. The control circuit of the electric three-way switching valve C controls the electric three-way switching valve C7 to close port 2 and open port 3, allowing water to flow in from port 3 and out from port 1. The water then flows in the opposite direction from port 1 to port 2 of the electric three-way switching valve A, and then through port 3 of the electric three-way switching valve A and the hot water circulation pump inlet into the hot water circulation pump. This allows the tap water to circulate through the water heater and heat the tap water under the action of the hot water circulation pump. When the hot water temperature sensor detects that the water temperature has reached the set temperature, the central control unit sends a command to the electrically controlled three-way switching valve A via the control circuit of the valve, opening port one and closing port three. This allows water to flow from port one to port two and then to port one of the electrically controlled three-way switching valve C. Simultaneously, the hot water circulation pump is shut down via the control circuit of the hot water circulation pump. At the same time, port two of the electrically controlled three-way switching valve B is closed via the control circuit of the valve B, allowing tap water to flow through the valve B. The water flows from port 1 to port 3 of the electric three-way switching valve B, and then to the water inlet of the water heater. Simultaneously, the control circuit of the electric three-way switching valve D closes port 2, allowing heated water to flow into port 1 of the electric three-way switching valve D, then through port 3 to the hot water pipe of the adjustable temperature faucet, and finally out. At the same time, the control circuit of the electric three-way switching valve C closes port 3, allowing tap water to flow from port 1 of the electric three-way switching valve C to port 2 of the electric three-way switching valve C, and finally out through the cold water pipe of the adjustable temperature faucet.

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