Indoor and outdoor double-barrel water-saving solar water heater, control system and control method

Abstract

The present invention relates to an indoor and outdoor dual-barrel water-saving solar water heater, a control system, and a control method. The indoor and outdoor dual-barrel water-saving solar water heater includes an outdoor water tank and an indoor water tank. The hot water outlet of the outdoor water tank is connected to the indoor water tank via a first pipeline, and the water outlet of the indoor water tank is connected to the hot water inlet of a mixing valve via a fourth pipeline. A booster pump is installed on the fourth pipeline. The present invention circulates hot water from the outdoor water tank to the indoor water tank based on data such as time, indoor water tank water temperature, indoor water tank liquid level, outdoor water tank water temperature, and outdoor water tank liquid level. The hot water flows from the indoor water tank through a relatively short indoor pipeline to the mixing valve, thereby reducing the problem of hot water generated by traditional solar water heaters passing through a relatively long outdoor pipeline, resulting in a large amount of cold water being retained in the pipeline and wasted. The booster pump is provided to increase and stabilize the water pressure at the outlet of the indoor water tank, thereby solving the problem of low water pressure at the outlet of the solar water heater.

Description

Technical Field

[0001] The present invention relates to the technical field of solar water heaters, and in particular to an indoor and outdoor double-barrel water-saving solar water heater, a control system and a control method. Background Art

[0002] Solar water heaters are a common household appliance. Hot water heated by solar energy is mixed with cold water through a mixing valve to create a warm water temperature suitable for consumption. Since most solar water heaters are located on rooftops, the pipes connecting them to the mixing valves are long, resulting in a large amount of cold water trapped in the pipes. The lower the floor, the more cold water is trapped, which is then directly discharged when the water is used. Especially in winter, the temperature of the water trapped in the pipe connecting the solar water heater and the mixing valve drops rapidly. Therefore, the cold water trapped in the pipes must be discharged every time the water is used, resulting in a significant waste of water resources.

[0003] In addition, since the water pressure of solar water is low and unstable, the water pressure after mixing through the mixing valve is low and the water temperature is unstable, which may even cause burns or cold water, affecting normal use. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides an indoor and outdoor double-barrel water-saving solar water heater, a control system and a control method, which not only improves the stability of the water pressure at the mixing valve outlet, but also avoids the waste of retained cold water.

[0005] The present invention is achieved through the following technical solution, which provides an indoor and outdoor double-barrel water-saving solar water heater, including an outdoor water storage tank and a solar heating device adapted to the outdoor water storage tank. The cold water inlet of the outdoor water storage tank is connected to the water source through a second pipeline, and the second pipeline is connected to the cold water inlet of a mixing valve through a fifth pipeline. The solar water heater also includes an indoor water storage tank located indoors, the hot water outlet of the outdoor water storage tank is connected to the water inlet of the indoor water storage tank through a first pipeline, and the water outlet of the indoor water storage tank is connected to the hot water inlet of the mixing valve through a fourth pipeline, and a pressure pump is installed on the fourth pipeline.

[0006] This solution uses a solar heating device to heat the water in the outdoor water tank. By setting up an indoor water tank, the hot water heated in the outdoor water tank is temporarily stored. When in use, hot water is obtained from the indoor water tank, thereby shortening the length of cold water retention upstream of the mixing valve and reducing waste. By setting up a pressure pump, the pressure stability of the water supply to the mixing valve is guaranteed.

[0007] As an optimization, a third pipeline equipped with solenoid valve III is also included. The outlet of the third pipeline is connected to the cold water inlet of the outdoor water tank, and the inlet of the third pipeline is connected to the fourth pipeline. The connection point between the third and fourth pipelines is located between the booster pump and the mixing valve. Through this optimization scheme, when the water temperature in the indoor water tank is low, the booster pump will pump the cold water in the indoor water tank through the third pipeline to the outdoor water tank, and the hot water in the outdoor water tank will enter the indoor water tank, thereby raising the water temperature in the indoor water tank and meeting the usage requirements.

[0008] As an optimization, the outlet of the third pipe is connected to the second pipe. Solenoid Valve II is installed on the second pipe upstream of the third pipe's outlet and downstream of the connection point between the fifth and second pipes. This optimization solution uses the second pipe to connect the third pipe to the outdoor water tank, simplifying the piping structure. The installation of Solenoid Valve II also prevents water from the indoor water tank from flowing into the tap water source.

[0009] As an optimization, the indoor water tank is equipped with a temperature sensor II and an electric heating device. This optimization solution installs a temperature sensor II in the indoor water tank to facilitate measuring the water temperature in the indoor water tank. By installing an electric heating device, the water in the indoor water tank is easily heated to meet the demand for hot water in cloudy environments.

[0010] As an optimization, a liquid level sensor II is installed in the indoor water tank, and a solenoid valve I is installed on the first pipe. This optimization solution uses the liquid level sensor II to detect the water level in the indoor water tank, and the solenoid valve I to control the flow of water from the outdoor water tank to the indoor water tank, preventing excessive water from overflowing from the indoor water tank.

[0011] This solution also provides a control system for the indoor and outdoor dual-barrel water-saving solar water heater, comprising a controller electrically connected to a booster pump, solenoid valve II, and solenoid valve III, and a temperature sensor II electrically connected to the controller. Temperature sensor II is used to detect the water temperature in the indoor water tank and transmit a temperature signal to the controller. When the signal received by temperature sensor II is greater than a set value, the controller closes solenoid valves III and II and activates the booster pump to deliver water from the indoor water tank to the mixing valve. When the signal received by temperature sensor II is less than a set value, the controller opens solenoid valves III and I, closes solenoid valve II, and activates the booster pump to deliver water from the indoor water tank to the outdoor water tank. Hot water in the outdoor water tank flows to the indoor water tank via a first pipeline. This control system receives temperature signals through the controller and controls pipeline switching based on temperature levels, ensuring that the water flowing from the indoor water tank to the mixing valve meets usage requirements while reducing the amount of cold water retained in the pipeline upstream of the mixing valve, thereby minimizing waste.

[0012] This solution also provides a control method for the above-mentioned indoor and outdoor double-barrel water-saving solar water heater, which is characterized by comprising:

[0013] S100, reading the water temperature and water level of the indoor water tank, the water temperature and water level of the outdoor water tank, and the current time;

[0014] S200, if the current time is equal to T1, perform the outdoor water tank filling operation: if the water level in the indoor water tank is greater than R% of the total water volume, open solenoid valve III and close the other solenoid valves, and the water in the indoor water tank flows to the outdoor water tank until the water level in the indoor water tank equals R% of the total water volume. If the outdoor water tank is not full at this time, open solenoid valve II and close the other solenoid valves, and tap water flows into the outdoor water tank until the outdoor water tank is full, and then close all solenoid valves;

[0015] Time T1 is a certain moment between 8:00 and 10:00 in the morning;

[0016] R% is the ratio of the set value of the indoor water storage tank to the total water volume of the indoor water storage tank, which is a value between 20% and 60% to ensure that there is enough hot water in the indoor water storage tank for users during the day;

[0017] S300: If the current time is between T2 and T3 and is not equal to T1, the water temperature of the indoor water storage tank is less than Temp1, and the water temperature of the outdoor water storage tank is less than Temp2, no action is required when water is not needed; when water is needed, manual operation is performed and manual water use mode is started with one button;

[0018] Time T2 is a time between 8:00 and 10:00 in the morning; Time T3 is a time between 15:00 and 18:00 in the afternoon; Temp1 is a temperature between 40°C and 45°C; Temp2 is a temperature between 50°C and 55°C;

[0019] S400: If the current time is between T2 and T3 and is not equal to T1, the water temperature of the indoor water tank is less than Temp1, the water temperature of the outdoor water tank is greater than Temp2, and the water volume in the outdoor water tank is less than R% of the total water volume, perform the tap water filling operation to the outdoor water tank: open solenoid valve II, close the other solenoid valves, and allow cold tap water to flow to the outdoor water tank until the water volume in the outdoor water tank exceeds R% of the total water volume, then close all solenoid valves;

[0020] S500. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is less than Temp1, the water temperature in the outdoor water storage tank is greater than Temp2, the water volume in the outdoor water storage tank is greater than R% of the total water volume, and the water volume in the indoor water storage tank is less than R% of the total water volume, perform the operation of flowing water from the outdoor water storage tank into the indoor water storage tank: open solenoid valve I, close the other solenoid valves, and let the water flow from the outdoor water storage tank to the indoor water storage tank until the water volume in the indoor water storage tank > R% of the total water volume, then close the solenoid valve; subsequently, if the water volume in the outdoor water storage tank > R% of the total water volume, do not perform any action; if the water volume in the outdoor water storage tank < R% of the total water volume, perform the operation of flowing tap water to the outdoor water storage tank: open solenoid valve II, close the other solenoid valves, and let the tap water flow to the outdoor water storage tank until the water volume in the outdoor water storage tank > R% of the total water volume;

[0021] S600. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is less than Temp1, the water temperature in the outdoor water storage tank is greater than Temp2, the water volume in the outdoor water storage tank is greater than R% of the total water volume, and the water volume in the indoor water storage tank is greater than R% of the total water volume, perform the operation of circulating water between the indoor water storage tank and the outdoor water storage tank: open solenoid valve I, close solenoid valve II, open solenoid valve III, and circulate the water between the outdoor water storage tank and the indoor water storage tank until the difference between the water temperature in the indoor water storage tank and the water temperature in the outdoor water storage tank is less than 3°C or the water temperature in the indoor water storage tank is greater than Temp1;

[0022] S700. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is greater than Temp1, the water volume in the indoor water storage tank is less than R% of the total water volume, and the water temperature in the outdoor water storage tank is greater than Temp2, perform the operation of flowing water from the outdoor water storage tank into the indoor water storage tank: open solenoid valve I, close the other solenoid valves, and let the hot water in the outdoor water storage tank flow to the indoor water storage tank until the water volume in the indoor water storage tank > R% of the total water volume, and then if the water volume in the outdoor water storage tank > R% of the total water volume, do not perform any action, if the water volume in the outdoor water storage tank < R% of the total water volume, perform the operation of filling water from tap water to the outdoor water storage tank: open solenoid valve II, close the other solenoid valves, and let the tap water flow to the outdoor water storage tank until the water volume in the outdoor water storage tank > R% of the total water volume, then close all solenoid valves;

[0023] S800. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is greater than Temp1, the water volume in the indoor water storage tank is less than R% of the total water volume, and the water temperature in the outdoor water storage tank is less than Temp2, do not perform any action. If water is needed, perform manual operation and start the manual water use mode with one key;

[0024] S900. If the current time is equal to T4, and the water temperature of the outdoor water storage tank minus the water temperature of the indoor water storage tank is greater than 5°C, and the water temperature of the outdoor water storage tank is greater than Temp2, open solenoid valve I and close the other solenoid valves. Let the hot water in the outdoor water storage tank flow to the indoor water storage tank until the indoor water storage tank is full; if the water temperature of the outdoor water storage tank minus the water temperature of the indoor water storage tank is greater than 5°C, open solenoid valve I and solenoid valve III, close solenoid valve II, and circulate the water between the indoor water storage tank and the outdoor water storage tank until the water temperature of the outdoor water storage tank minus the water temperature of the indoor water storage tank is less than 3°C; at this time, if the water temperature of the indoor water storage tank is greater than Temp1, no action is taken, otherwise heating operation is performed until the water temperature of the indoor water storage tank is greater than Temp1;

[0025] T4 is a certain moment between 16:00 and 18:00, and the time of T4 is later than the time of T3.

[0026] The control method of this solution meets the daily water use requirements in various situations, ensures the water temperature, reduces water waste, and ensures the stability of the water pressure at the outlet of the mixing valve.

[0027] As an optimization, the automatic control process of the manual water use mode is as follows: If the water volume in the indoor water storage tank < R% of the total water volume, perform the operation of adding water to the indoor water storage tank: open solenoid valve I, close the other solenoid valves. After the indoor water storage tank reaches a certain water volume, close all solenoid valves and perform the heating operation until the set temperature is reached, then stop heating; if the water volume in the indoor water storage tank > R% of the total water volume, only perform the heating operation until the set temperature Temp1 is reached, then stop heating.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1. According to data such as time, the water temperature of the indoor water storage tank, the liquid level of the indoor water storage tank, the water temperature of the outdoor water storage tank, and the liquid level of the outdoor water storage tank, the hot water in the outdoor water storage tank is circulated to the indoor water storage tank. When the user uses water, the hot water reaches the mixing valve through a shorter indoor pipeline from the indoor water storage tank, and after being mixed with cold water, it is provided to the user. Thus, it reduces the situation where a large amount of cold water stays in the pipeline due to the hot water from the traditional solar water heater reaching the mixing valve through a long outdoor pipeline, effectively reducing water resource waste;

[0030] 2. By setting a booster pump in the fourth pipeline, the water pressure at the outlet of the indoor water storage tank is increased and stabilized, solving the problem of low water pressure at the outlet of the solar water heater;

[0031] 3. It effectively avoids the problem of water resource waste caused by a large amount of cold water staying in the pipeline, has a simple structure, is easy to operate, has a low cost, and is reasonably designed, worthy of being vigorously promoted. Description of the Drawings

[0032] Figure 1This is a schematic diagram of the process structure of the indoor and outdoor double-barrel water-saving solar water heater of the present invention;

[0033] Figure 2 Schematic diagram of the controller structure of the present invention;

[0034] Figure 3 This is a flow chart of the control method of the present invention;

[0035] Figure 4 for Figure 3 The first partial enlarged view;

[0036] Figure 5 for Figure 3 The second partial enlarged view;

[0037] Figure 6 for Figure 3 The third partial enlarged view;

[0038] Figure 7 for Figure 3 The fourth partial enlarged picture;

[0039] As shown in the figure:

[0040] 1. Outdoor water storage tank, 2. Liquid level sensor I, 3. Temperature sensor I, 4. Liquid level sensor II, 5. Temperature sensor II, 6. Indoor water storage tank, 7. Controller, 8. Booster pump, 9. Solenoid valve I, 10. Solenoid valve II, 11. Mixing valve, 12. Shower head, 13. Solenoid valve III, 14. Electric heating device, 15. Solar heating device, 101. First pipeline, 102. Second pipeline, 103. Third pipeline, 104. Fourth pipeline, 105. Fifth pipeline. DETAILED DESCRIPTION

[0041] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0043] Current household solar water heaters encounter numerous practical challenges. For example, the pipes between the solar water storage tank and the mixing valve are long, and much of the pipes are located outdoors, resulting in a large amount of trapped cold water. Users must drain the trapped cold water before they can use the water. Especially in winter, this trapped hot water quickly cools, requiring the user to drain the cold water every time they use it. This wastes significant water resources and creates significant inconvenience for the user. Furthermore, solar water pressure is low and unstable, causing the water to fluctuate between hot and cold, sometimes even causing burns.

[0044] In view of the above defects, Figure 1 As shown, this embodiment provides an indoor and outdoor double-barrel water-saving solar water heater, including an indoor water storage tank 6 located indoors, an outdoor water storage tank 1 located outdoors, and a solar heating device 15 adapted to the outdoor water storage tank. The cold water inlet of the outdoor water storage tank is connected to the tap water source through a second pipe 102. The system automatically fills the tap water into the outdoor water storage tank 1 at a set time every day, and uses the solar heating device 15 to heat the water.

[0045] The second pipeline is connected to the cold water inlet of the mixing valve 11 through the fifth pipeline 105, and the hot water outlet of the outdoor water tank is connected to the water inlet of the indoor water tank through the first pipeline 101. The first pipeline 101 is equipped with an indoor solenoid valve Ⅰ9 to control the water flow from the outdoor water tank 1 to the indoor water tank 6. The outdoor water tank is equipped with a liquid level sensor Ⅰ2 and a temperature sensor Ⅰ3. The temperature sensor Ⅰ3 is used to measure the water temperature of the outdoor water tank, and the liquid level sensor Ⅰ2 is used to measure the water volume of the outdoor water tank.

[0046] The water outlet of the indoor water storage tank is connected to the hot water inlet of the mixing valve through the fourth pipeline 104. A pressure pump 8 is installed on the fourth pipeline. The pressure pump increases the water outlet pressure of the indoor water storage tank, thereby improving the stability of the water outlet pressure of the mixing valve. The mixed water outlet of the mixing valve is connected to the shower head 12.

[0047] This embodiment also includes a third pipeline 103 equipped with a solenoid valve III 13. The outlet of the third pipeline is connected to the cold water inlet of the outdoor water tank, and the inlet of the third pipeline is connected to the fourth pipeline. The connection point between the third and fourth pipelines is located between the booster pump 8 and the mixing valve 11. To simplify the pipeline structure, the outlet of the third pipeline in this embodiment is connected to the second pipeline. The second pipeline is equipped with a solenoid valve II 10 located upstream of the outlet of the third pipeline. The solenoid valve II is located downstream of the connection point between the fifth pipeline and the second pipeline. The solenoid valve II 10 is used to cooperate with the solenoid valve III 13 to control the flow of tap water into the outdoor water tank.

[0048] The indoor water storage tank 6 is equipped with a liquid level sensor II4, a temperature sensor II5 and an electric heating device 14. The temperature sensor II is used to measure the water temperature in the indoor water storage tank and transmit the temperature signal to the controller. The liquid level sensor II4 is used to measure the water volume in the indoor water storage tank. The electric heating device 14 is used to heat the water in the indoor water storage tank under cloudy conditions.

[0049] The control system of the indoor and outdoor double-barrel water-saving solar water heater of this embodiment includes a controller 7, which is electrically connected to the temperature sensor I, the temperature sensor II, the pressure pump, the solenoid valve I, the solenoid valve II, the solenoid valve III, the liquid level sensor I, the liquid level sensor II 4 and the electric heating device 14. The controller of this embodiment adopts a single chip microcomputer. Specifically, Figure 2 As shown, the controller is connected to temperature sensor I3, temperature sensor II5, liquid level sensor I2, and liquid level sensor II4 via an A / D converter, and to solenoid valves I9, II10, and III13 via relays. It is also connected to a power supply, a clock chip, a heating device, buttons, a display, and an alarm. When the signal received by the controller from temperature sensor II is greater than the set value, it closes solenoid valves III and II and activates the booster pump to deliver water from the indoor water tank to the mixing valve. When the signal received by the controller from temperature sensor II is less than the set value, it opens solenoid valves III and I, closes solenoid valve II, and activates the booster pump to deliver water from the indoor water tank to the outdoor water tank. The hot water in the outdoor water tank then flows through the first pipeline to the indoor water tank.

[0050] Controller 7 is used to collect the water temperature of the indoor water tank, the liquid level of the indoor water tank, the water temperature of the outdoor water tank, and the liquid level of the outdoor water tank. According to the current time, the water temperature of the indoor water tank, the liquid level of the indoor water tank, the water temperature of the outdoor water tank, and the liquid level of the outdoor water tank, the controller controls the solenoid valve I9, the solenoid valve II10, and the solenoid valve III13 respectively to realize the functions of supplying tap water to the outdoor water tank, hot water from the outdoor water tank flowing into the indoor water tank, and cold water from the indoor water tank circulating into the outdoor water tank.

[0051] Specifically, when a certain set time is reached, such as 17:00, if the outdoor water storage tank 1 has sufficient water volume and the temperature is high, and the indoor water storage tank 6 has less water volume or more water volume and a higher temperature, the solenoid valve I9 ​​is ​​opened to allow the water in the outdoor water storage tank 1 to flow into the indoor water storage tank 6, so that the hot water in the outdoor water storage tank 1 flows to the indoor water storage tank 6, ensuring that the indoor water storage tank 6 has sufficient hot water for users to use at night; if the water volume in the indoor water storage tank 6 is large and the temperature is low, the solenoid valve I9 ​​and the solenoid valve III13 are opened, and the solenoid valve II10 is closed, so that the hot water in the outdoor water storage tank 1 flows to the indoor water storage tank 6 through the first pipeline 101, and at the same time, the cold water in the indoor water storage tank 6 circulates to the outdoor water storage tank 1 through the third pipeline 103 and the second pipeline 102, thereby achieving the purpose of raising the water temperature in the indoor water storage tank 6;

[0052] When a set time is reached, such as 9:00, and the outdoor water tank is not full, the solenoid valve II 10 is opened, the solenoid valve I 9 and the solenoid valve III 13 are closed, and the tap water flows into the outdoor water tank 1 through the second pipe 102 until the outdoor water tank is full of water;

[0053] During the day (for example, between 9:00 and 16:00), the heat from the outdoor water tank is transferred to the indoor water tank by controlling the solenoid valve I9, solenoid valve II10, and solenoid valve III13 according to the water temperature and water level of the indoor and outdoor water tanks, ensuring that there is sufficient water in the indoor water tank and hot water of high enough temperature during the day to facilitate users' water use during the day.

[0054] When it is cloudy or rainy, the electric heating device 14 is started to heat the water stored in the indoor water storage tank 6 to ensure hot water supply on cloudy or rainy days.

[0055] The controller 7 of the present embodiment also comprises a communication module, thereby is conducive to realizing the remote control and the alarm of the operator's mobile phone.In addition, the controller can also be provided with a touch screen, to realize touch screen control.

[0056] The control method of the indoor and outdoor dual-barrel water-saving solar water heater of this embodiment includes the following aspects:

[0057] S100, reading the water temperature and water level of the indoor water tank, the water temperature and water level of the outdoor water tank, and the current time;

[0058] S200, if the current time is equal to T1, perform the outdoor water tank filling operation: if the water level in the indoor water tank is greater than R% of the total water volume, open solenoid valve III and close the other solenoid valves, and the water in the indoor water tank flows to the outdoor water tank until the water level in the indoor water tank equals R% of the total water volume. If the outdoor water tank is not full at this time, open solenoid valve II and close the other solenoid valves, and tap water flows into the outdoor water tank until the outdoor water tank is full, and then close all solenoid valves;

[0059] Time T1 is a time between 8:00 and 10:00 a.m., and in this embodiment, T1 is 9:00 a.m.;

[0060] R% is the ratio of the set value of the indoor water storage tank water volume to the total water volume of the indoor water storage tank, and is a value between 20% and 60% to ensure that there is enough hot water in the indoor water storage tank for users during the day. In this embodiment, R% is 1 / 2;

[0061] S300. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is less than Temp1, and the water temperature in the outdoor water storage tank is less than Temp2, when there is no water consumption, no action is required; when water is needed, manual operation is performed to start the manual water use mode with one key. The automatic control process of the manual water use mode is as follows: If the water volume in the indoor water storage tank < R% of the total water volume, perform the operation of adding water to the indoor water storage tank: open solenoid valve I, close the other solenoid valves. After the indoor water storage tank reaches a certain water volume, close all solenoid valves and perform the heating operation until the set temperature is reached, then stop heating. If the water volume in the indoor water storage tank > R% of the total water volume, only perform the heating operation until the set temperature Temp1 is reached, then stop heating.

[0062] The time T2 is a certain moment between 8:00 am and 10:00 am; the time T3 is a certain moment between 3:00 pm and 6:00 pm; Temp1 is a temperature value between 40°C and 45°C; Temp2 is a temperature value between 50°C and 55°C. In this embodiment, T2 is 8:00 am, T3 is 4:00 pm, Temp1 is 45°C, and Temp2 is 50°C.

[0063] S400. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is less than Temp1, the water temperature in the outdoor water storage tank is greater than Temp2, and the water volume in the outdoor water storage tank is less than R% of the total water volume, perform the operation of filling water from the tap water to the outdoor water storage tank: open solenoid valve II, close the other solenoid valves, and the cold water of the tap water flows to the outdoor water storage tank until the water volume in the outdoor water storage tank > R% of the total water volume, then close all solenoid valves;

[0064] S500. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is less than Temp1, the water temperature in the outdoor water storage tank is greater than Temp2, the water volume in the outdoor water storage tank is greater than R% of the total water volume, and the water volume in the indoor water storage tank is less than R% of the total water volume, perform the operation of the water in the outdoor water storage tank flowing into the indoor water storage tank: open solenoid valve I, close the other solenoid valves, and the water flows from the outdoor water storage tank to the indoor water storage tank until the water volume in the indoor water storage tank > R% of the total water volume, then close the solenoid valve; Subsequently, if the water volume in the outdoor water storage tank > R% of the total water volume, no action is taken; if the water volume in the outdoor water storage tank < R% of the total water volume, perform the operation of the tap water flowing to the outdoor water storage tank: open solenoid valve II, close the other solenoid valves, and the tap water flows to the outdoor water storage tank until the water volume in the outdoor water storage tank > R% of the total water volume;

[0065] S600. If the current time is between T2 and T3 and not equal to T1, the water temperature of the indoor water storage tank is less than Temp1, the water temperature of the outdoor water storage tank is greater than Temp2, the water volume of the outdoor water storage tank is greater than R% of the total water volume, and the water volume of the indoor water storage tank is greater than R% of the total water volume, perform the water circulation operation between the indoor water storage tank and the outdoor water storage tank: open solenoid valve I, close solenoid valve II, open solenoid valve III, and circulate the water between the outdoor water storage tank and the indoor water storage tank until the temperature difference between the water temperature of the indoor water storage tank and the water temperature of the outdoor water storage tank is less than 3°C or the water temperature of the indoor water storage tank is greater than Temp1;

[0066] S700. If the current time is between T2 and T3 and not equal to T1, the water temperature of the indoor water storage tank is greater than Temp1, the water volume of the indoor water storage tank is less than R% of the total water volume, and the water temperature of the outdoor water storage tank is greater than Temp2, perform the operation of flowing the water from the outdoor water storage tank into the indoor water storage tank: open solenoid valve I, close the other solenoid valves, and let the hot water in the outdoor water storage tank flow to the indoor water storage tank until the water volume of the indoor water storage tank > R% of the total water volume. Then, if the water volume of the outdoor water storage tank > R% of the total water volume, do not perform any action. If the water volume of the outdoor water storage tank < R% of the total water volume, perform the operation of filling the outdoor water storage tank with tap water: open solenoid valve II, close the other solenoid valves, and let the tap water flow to the outdoor water storage tank until the water volume of the outdoor water storage tank > R% of the total water volume, and then close all solenoid valves;

[0067] S800. If the current time is between T2 and T3 and not equal to T1, the water temperature of the indoor water storage tank is greater than Temp1, the water volume of the indoor water storage tank is less than R% of the total water volume, and the water temperature of the outdoor water storage tank is less than Temp2, do not perform any action. If water is needed, perform manual operation and start the manual water use mode with one key;

[0068] S900. If the current time is equal to T4, the difference between the water temperature of the outdoor water storage tank and the water temperature of the indoor water storage tank is greater than 5°C, and the water temperature of the outdoor water storage tank is greater than Temp2, open solenoid valve I, close the other solenoid valves, and let the hot water in the outdoor water storage tank flow to the indoor water storage tank until the indoor water storage tank is full; if the difference between the water temperature of the outdoor water storage tank and the water temperature of the indoor water storage tank is greater than 5°C, open solenoid valve I and solenoid valve III, close solenoid valve II, and circulate the water between the indoor water storage tank and the outdoor water storage tank until the difference between the water temperature of the outdoor water storage tank and the water temperature of the indoor water storage tank is less than 3°C. At this time, if the water temperature of the indoor water storage tank is greater than Temp1, do not perform any action, otherwise perform the heating operation until the water temperature of the indoor water storage tank is greater than Temp1; T4 is a certain moment between 16:00 and 18:00, and the time of T4 is later than the time of T3.

[0069] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by adopting existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical solutions of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A control method for an indoor and outdoor double-barrel water-saving solar water heater, characterized by: The indoor and outdoor double-barrel water-saving solar water heater comprises an outdoor water storage tank (1) and a solar heating device (15) adapted to the outdoor water storage tank, wherein the cold water inlet of the outdoor water storage tank is connected to a water source via a second pipeline (102), and the second pipeline is connected to the cold water inlet of a water mixing valve (11) via a fifth pipeline (105); and further comprises an indoor water storage tank (6) located indoors, wherein the hot water outlet of the outdoor water storage tank is connected to the water inlet of the indoor water storage tank via a first pipeline (101), and the water outlet of the indoor water storage tank is connected to the hot water inlet of the water mixing valve via a fourth pipeline (104), and a pressure pump (8) is installed on the fourth pipeline; It also includes a third pipeline (103) equipped with a solenoid valve III (13), the water outlet of the third pipeline is connected to the cold water inlet of the outdoor water storage tank, the water inlet of the third pipeline is connected to the fourth pipeline, and the connection point between the third pipeline and the fourth pipeline is located between the pressure pump (8) and the mixing valve (11); The water outlet end of the third pipeline is connected to the second pipeline, and the second pipeline is provided with a solenoid valve II (10) located upstream of the water outlet end of the third pipeline, and the solenoid valve II is located downstream of the connection point between the fifth pipeline and the second pipeline; The control method includes: S100, reading the water temperature and water level of the indoor water tank, the water temperature and water level of the outdoor water tank, and the current time; S200, if the current time is equal to T1, perform the outdoor water tank filling operation: if the water level in the indoor water tank is greater than R% of the total water volume, open solenoid valve III and close the other solenoid valves, and the water in the indoor water tank flows to the outdoor water tank until the water level in the indoor water tank equals R% of the total water volume. If the outdoor water tank is not full at this time, open solenoid valve II and close the other solenoid valves, and tap water flows into the outdoor water tank until the outdoor water tank is full, and then close all solenoid valves; Time T1 is a certain moment between 8:00 and 10:00 in the morning; R% is the ratio of the set value of the indoor water storage tank to the total water volume of the indoor water storage tank, which is a value between 20% and 60% to ensure that there is enough hot water in the indoor water storage tank for users during the day; S300: If the current time is between T2 and T3 and is not equal to T1, the water temperature of the indoor water storage tank is less than Temp1, and the water temperature of the outdoor water storage tank is less than Temp2, no action is required when water is not needed; when water is needed, manual operation is performed and manual water use mode is started with one button; Time T2 is a time between 8:00 and 10:00 in the morning; Time T3 is a time between 15:00 and 18:00 in the afternoon; Temp1 is a temperature between 40°C and 45°C; Temp2 is a temperature between 50°C and 55°C; S400: If the current time is between T2 and T3 and is not equal to T1, the water temperature of the indoor water tank is less than Temp1, the water temperature of the outdoor water tank is greater than Temp2, and the water volume in the outdoor water tank is less than R% of the total water volume, perform the tap water filling operation to the outdoor water tank: open solenoid valve II, close the other solenoid valves, and allow cold tap water to flow to the outdoor water tank until the water volume in the outdoor water tank exceeds R% of the total water volume, then close all solenoid valves; S500. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is less than Temp1, the water temperature in the outdoor water storage tank is greater than Temp2, the water volume in the outdoor water storage tank is greater than R% of the total water volume, and the water volume in the indoor water storage tank is less than R% of the total water volume, perform the operation of flowing water from the outdoor water storage tank into the indoor water storage tank: Open solenoid valve I, close the other solenoid valves, and let the water flow from the outdoor water storage tank to the indoor water storage tank until the water volume in the indoor water storage tank > R% of the total water volume, then close the solenoid valve. Subsequently, if the water volume in the outdoor water storage tank > R% of the total water volume, do not perform any action; if the water volume in the outdoor water storage tank < R% of the total water volume, perform the operation of flowing tap water to the outdoor water storage tank: Open solenoid valve II, close the other solenoid valves, and let the tap water flow to the outdoor water storage tank until the water volume in the outdoor water storage tank > R% of the total water volume; S600. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is less than Temp1, the water temperature in the outdoor water storage tank is greater than Temp2, the water volume in the outdoor water storage tank is greater than R% of the total water volume, and the water volume in the indoor water storage tank is greater than R% of the total water volume, perform the water circulation operation between the indoor water storage tank and the outdoor water storage tank: Open solenoid valve I, close solenoid valve II, open solenoid valve III, and circulate the water between the outdoor water storage tank and the indoor water storage tank until the difference between the water temperature in the indoor water storage tank and the water temperature in the outdoor water storage tank is less than 3°C or the water temperature in the indoor water storage tank is greater than Temp1; S700. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is greater than Temp1, the water volume in the indoor water storage tank is less than R% of the total water volume, and the water temperature in the outdoor water storage tank is greater than Temp2, perform the operation of flowing water from the outdoor water storage tank into the indoor water storage tank: Open solenoid valve I, close the other solenoid valves, and let the hot water in the outdoor water storage tank flow to the indoor water storage tank until the water volume in the indoor water storage tank > R% of the total water volume. Then, if the water volume in the outdoor water storage tank > R% of the total water volume, do not perform any action; if the water volume in the outdoor water storage tank < R% of the total water volume, perform the operation of filling water from tap water to the outdoor water storage tank: Open solenoid valve II, close the other solenoid valves, and let the tap water flow to the outdoor water storage tank until the water volume in the outdoor water storage tank > R% of the total water volume, then close all solenoid valves; S800. If the current time is between T2 and T3 and not equal to T1, the water temperature in the indoor water storage tank is greater than Temp1, the water volume in the indoor water storage tank is less than R% of the total water volume, and the water temperature in the outdoor water storage tank is less than Temp2, do not perform any action. If water is needed, perform manual operation and start the manual water - using mode with one key; S900. If the current time is equal to T4, the difference between the water temperature in the outdoor water storage tank and the water temperature in the indoor water storage tank is greater than 5°C, and the water temperature in the outdoor water storage tank is greater than Temp2, open solenoid valve I, close the other solenoid valves, and let the hot water in the outdoor water storage tank flow to the indoor water storage tank until the indoor water storage tank is full. If the difference between the water temperature in the outdoor water storage tank and the water temperature in the indoor water storage tank is greater than 5°C, open solenoid valve I and solenoid valve III, close solenoid valve II, and circulate the water between the indoor water storage tank and the outdoor water storage tank until the difference between the water temperature in the outdoor water storage tank and the water temperature in the indoor water storage tank is less than 3°C. At this time, if the water temperature in the indoor water storage tank is greater than Temp1, then do not perform any action; otherwise, perform the heating operation until the water temperature in the indoor water storage tank is greater than Temp1; T4 is a certain moment between 16:00 and 18:00, and the time of T4 is later than the time of T3.

2. The control method of the indoor and outdoor double-barrel water-saving solar water heater according to claim 1 is characterized in that: A temperature sensor II (5) and an electric heating device (14) are installed in the indoor water storage tank (6).

3. The control method of the indoor and outdoor double-barrel water-saving solar water heater according to claim 2, characterized in that: A liquid level sensor II (4) is also installed in the indoor water storage tank, and a solenoid valve I (9) is installed on the first pipeline (101).

4. The control method of the indoor and outdoor double-barrel water-saving solar water heater according to claim 1, characterized in that: The automatic control process of the manual water use mode is as follows: If the water volume in the indoor water storage tank < R% of the total water volume, perform the operation of adding water to the indoor water storage tank: open the solenoid valve I, close the other solenoid valves, and after the indoor water storage tank reaches a certain water volume, close all solenoid valves, perform the heating operation until the set temperature is reached, and then stop heating; If the water volume in the indoor water storage tank > R% of the total water volume, only perform the heating operation until the set temperature Temp1 is reached, and then stop heating.

5. A control system for the control method of the indoor and outdoor double-barrel water-saving solar water heater according to claim 1, characterized in that: It includes a controller (7) electrically connected to a pressure pump, a solenoid valve II, and a solenoid valve III, and a temperature sensor II electrically connected to the controller. The temperature sensor II is used to detect the water temperature in the indoor water storage tank and transmit the temperature signal to the controller; When the signal of the temperature sensor II received by the controller is greater than the set value, the controller closes the solenoid valve III and the solenoid valve II, and starts the pressure pump to send the water in the indoor water storage tank to the mixing valve; When the signal of the temperature sensor II received by the controller is less than the set value, the controller opens the solenoid valve III and the solenoid valve I, closes the solenoid valve II, and starts the pressure pump to send the water in the indoor water storage tank to the outdoor water storage tank, and the hot water in the outdoor water storage tank flows to the indoor water storage tank through the first pipeline.

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