Dual direct heating constant temperature zero cold water hot water system

Abstract

This utility model provides a dual direct-heating constant-temperature zero-cold-water hot water system, including a water tank and a check valve, a water pump, a solenoid valve, a variable heat source, a flow switch, an auxiliary instant electric heating device, a pipe temperature probe, and a return water solenoid valve connected to the water tank. The water pump, solenoid valve, variable heat source, flow switch, auxiliary instant electric heating device, and pipe temperature probe are also connected to a controller. The dual direct-heating constant-temperature zero-cold-water hot water system provided by this utility model has the advantages of low energy consumption, which helps to reduce operating costs and save energy. Compared with traditional technologies, it effectively reduces operating costs and makes a great contribution to energy conservation and emission reduction in human society. Therefore, this application has great social and economic value.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker design technology, and in particular to a dual direct heating constant temperature zero cold water hot water system. Background Technology

[0002] Energy conservation and emission reduction are the development direction, and products with lower energy consumption will be a future trend. Solar water heaters and air source water heaters, as low-energy-consumption products, are showing good development momentum. However, due to some limitations of the products themselves, they have certain limitations in meeting consumer needs. Therefore, integrated energy utilization has become another direction for the development of water heaters. As people's living standards improve, their requirements for comfort in home life are also increasing. Various electrical appliances have become more convenient, but they also occupy considerable space. As a result, more and more multifunctional appliances are entering people's lives. Water heaters have also undergone different generations of development; however, existing water heater technology still has many shortcomings, such as high energy consumption and high operating costs, requiring further improvement. Summary of the Invention

[0003] This utility model addresses the shortcomings of the prior art by providing a dual direct heating constant temperature zero cold water hot water system with low energy consumption, which helps reduce operating costs and save energy.

[0004] The specific technical solution of this utility model is as follows:

[0005] This utility model provides a dual direct heating constant temperature zero cold water hot water system, including a water tank and a check valve, a water pump, a solenoid valve, a variable heat source, a flow switch, an auxiliary instant electric heating device, a pipe temperature probe, and a return water solenoid valve connected to the water tank. The water pump, solenoid valve, variable heat source, flow switch, auxiliary instant electric heating device, and pipe temperature probe are also connected to a controller.

[0006] Furthermore, the water tank includes a pressurized water tank and a non-pressurized water tank.

[0007] Furthermore, the bottom of the non-pressurized water tank is sequentially connected to the check valve, the water pump, the variable heat source, and the return water solenoid valve. The variable heat source and the solenoid valve are connected to the flow switch, the auxiliary instantaneous electric heater, the pipeline temperature probe, and the return water solenoid valve. The top of the non-pressurized water tank is equipped with a water level switch, and the bottom is equipped with a non-pressurized water tank temperature probe. An inlet solenoid valve is also connected between the water pump and the variable heat source, and an inlet proportional regulating valve is also provided at the water pump.

[0008] An inlet water temperature probe is also connected between the water pump and the heat source.

[0009] The variable heat source is equipped with a high-temperature probe for a variable heat exchanger.

[0010] A booster pump is also connected between the flow switch and the non-pressurized water tank.

[0011] The controller is connected to the check valve, the water pump, the variable heat source, the solenoid valve, the flow switch, the auxiliary instantaneous electric heater, the pipeline temperature probe, the return water solenoid valve, and the inlet water solenoid valve.

[0012] Furthermore, the bottom of the pressurized water tank is sequentially connected to an inlet water temperature probe, a water pump, and a solenoid valve. The solenoid valve is connected to the top of the pressurized water tank via a bypass check valve. The solenoid valve is also connected to a variable heat source. The variable heat source is connected to a check valve and a flow switch via a variable heat exchanger outlet probe. The check valve is connected to the top of the pressurized water tank. The flow switch is connected to an auxiliary instant electric heating device. The auxiliary instant electric heating device is sequentially connected to a hot water temperature probe to supply water to the user. The hot water temperature probe is also connected to a return water pump and a return water check valve. The flow switch, the auxiliary instant electric heating device, and the hot water temperature probe are also connected to a controller.

[0013] Furthermore, when a user uses hot water, the flow switch is activated, and cold or warm water from the bottom outlet of the tank passes through a check valve and is then sent to the water pump for pressurization. The water is then sent to the heat source for heating, and finally flows to the user via the flow switch.

[0014] When the water temperature probe senses a water temperature 2-5 degrees Celsius lower than the set temperature, cold or warm water from the non-pressurized water tank exits through the inlet check valve, is sent to the water pump for pressurization, then to the variable heat source for heating, and finally flows back to the water tank via the solenoid valve, completing the circulating heating process until the set temperature is reached and heating stops.

[0015] When a non-pressurized water tank is not full, the water level switch is activated, and the inlet solenoid valve operates. Water enters the tank using the pressure of the tap water and is heated by the heat source. The water then returns to the tank via the solenoid valve until it is full. When the water temperature drops 2-5 degrees Celsius below the set temperature, it enters a circulation pressurization mode. When the user needs hot water, it enters hot water supply mode, prioritizing hot water supply.

[0016] To ensure a constant shower water temperature, when a user uses hot water, the flow switch is activated, the water pump and the variable-temperature heating source work, the solenoid valve is de-energized, and hot water flows out through the flow switch. After being heated by the auxiliary instantaneous heating element, it is then supplied to the user via the pipe temperature probe. When the water temperature probe shows a low reading, the variable-temperature heating source is increased up to its maximum. If the desired temperature is not reached, the auxiliary instantaneous heating element is activated; conversely, it decreases to ensure a constant water temperature output.

[0017] When the interval between water usages exceeds 8-15 minutes, hot water needs to be returned. When a user uses hot water, they first turn on the tap. At this time, the return water solenoid valve is already working. Cold or warm water is pumped down and heated by a variable heat source before returning to the non-pressurized water tank. The return water time is set to 1-8 minutes. Then, the return water solenoid valve is de-energized to complete the return water process.

[0018] Furthermore, it includes the following steps:

[0019] F1. Water inlet heating:

[0020] When the water tank is low on water, the inlet proportional control valve and the solenoid valve open, while the circulating pump stops working. The heat exchanger operates to heat the water, and the high-temperature probe of the heat exchanger senses the water temperature and adjusts the amount of cold water entering the tank through the inlet proportional control valve to ensure constant temperature water intake until the tank is full.

[0021] F2. Direct heating water inlet conversion:

[0022] When the inlet water flow is low or the water supply is interrupted, the variable heat exchanger will switch to circulating heating when the temperature sensed by the high temperature probe exceeds 95-115° (adjustable) until the water temperature reaches the set point and then stop. When the water tank temperature is lower than the set start-up temperature but the water level is not full, it will switch to direct heating.

[0023] F3. Circulating heating:

[0024] When the water tank temperature is lower than the equipment start value, the circulating water pump and solenoid valve work, followed by the heat exchanger, until the equipment water temperature reaches the set value.

[0025] F4. Water supply heating:

[0026] When a user uses hot water, the flow switch is activated, prioritizing hot water supply. During cold water intake, circulation heating, or winter defrosting, the system stops operating and switches to hot water supply. The proportional control valve and solenoid valve close, the circulation pump operates, and if the pipe temperature probe detects that the water temperature has not reached the set temperature, the auxiliary pipe thermoelectric heating system activates until the set temperature is reached.

[0027] F5. Return water control:

[0028] When hot water is used for the first time, the return water solenoid valve opens, repeating the water supply and heating process. The opening time of the return water solenoid valve is set to 2-10 minutes (adjustable) depending on the length of the hot water pipe. When hot water is used for the second time, the return water solenoid valve opens after 10-20 minutes (adjustable).

[0029] Furthermore, it includes the following steps:

[0030] The water tank can hold either cold or warm water. When a user needs hot water, the flow switch is turned on, and cold water enters the bottom of the pressurized water tank through the flow stabilizer pipe, then exits through the top of the pressurized water tank, and is sent to the variable heat source through the bypass check valve to be heated into hot water, which is then supplied to the user through the flow switch.

[0031] When the water temperature probe senses that the water temperature is 2-5 degrees lower than the set temperature, the cold water in the pressurized water tank enters the bottom outlet of the pressurized water tank through the flow stabilizing pipe, is pressurized by the water pump, passes through the solenoid valve, and is heated into hot water by the heat source. The hot water then returns to the top inlet of the pressurized water tank through the check valve, completing the cycle heating until the set water temperature is reached, at which point the equipment stops heating.

[0032] To ensure a constant shower water temperature, when the user uses hot water, the water flow switch is activated. The dual direct-heating pressurized constant-temperature zero-cold-water water heater utilizes the pressure of the tap water. Cold water enters the bottom of the pressurized water tank through the flow stabilizing pipe and then exits as hot water through the top of the pressurized water tank. The water pump and solenoid valve do not operate. Cold or warm water is heated by the variable heat source and then heated by the auxiliary instantaneous electric heating before being supplied to the user through the pipe temperature probe. When the water temperature is low, the variable heat source is increased until it reaches its maximum. If the temperature is not reached, the auxiliary instantaneous electric heating is activated. Conversely, the temperature is reduced to ensure a constant water temperature output.

[0033] If the interval between water usages exceeds 8-15 minutes, the water pipe temperature will have cooled down, and a backflow system is required when using hot water.

[0034] The solenoid valve needs to be moved from behind the water pump to before it, and the bypass check valve becomes a bypass solenoid valve, with the inlet located between the solenoid valve and the water pump. When the user uses hot water, the flow switch is activated, and the water in the tank is sent to the water pump for pressurization after passing through the bypass solenoid valve. Then, it is sent to the variable heat source for heating, and after passing through the flow switch, auxiliary instantaneous electric heating, and pipe temperature probe, it finally returns to the water tank through the return check valve. The return time is adjustable from 2 to 8 minutes depending on the length of the pipeline. Then, the water pump stops working, completing the zero-cold-water operation.

[0035] Furthermore, it includes the following steps:

[0036] S1: Water tank heating

[0037] The hot water supply to the water tank is completed by the pressure of tap water. Therefore, there are only two processes: water tank heating and water supply heating. When the water temperature is lower than the set value, the water pump and solenoid valve work. Then the variable heat source device also works. The water in the tank is pressurized by the circulation pump, then passes through the solenoid valve, and then is sent to the variable heat source for heating. Then it returns to the water tank through the check valve to complete the circulation heating until the water tank temperature reaches the set value.

[0038] S2: Water supply heating

[0039] When a user uses hot water, the water flow switch is activated, prioritizing the user's hot water usage. If the heat pump is used for winter defrosting, defrosting will stop, and the system will switch to supplying hot water for heating, stopping the circulating heating process. Water from the tank enters the variable heat source equipment via a bypass check valve for heating, and then is supplied to the user. When the water temperature does not reach the set value, the auxiliary pipeline, i.e., thermoelectric heating, is activated to heat the water.

[0040] When the water temperature sensed by the water tank temperature probe is lower than the startup value: the water pump and solenoid valve of the double-direct-heating non-pressure constant-temperature zero-cold-water water heater are powered on and work first. The inlet solenoid valve is de-energized to stop the intake of cold water. The variable-heat heat source works later, heats up and then enters the water tank to complete the circulating heating;

[0041] S3: Constant-temperature hot water

[0042] When the user uses hot water and the water flow switch is turned on, and the water temperature sensed by the pipeline temperature probe is on the low side, it notifies the variable-heat heat source to increase the heat. When it reaches the maximum and still cannot meet the set temperature, then the auxiliary instant electric heating is started. When the water temperature sensed by the pipeline temperature probe is on the high side, the equipment runs in the opposite direction of decreasing. At the same time, the water temperature of the water tank can be adjusted according to the amount of hot water used and the maximum temperature rise of the variable-heat heat source;

[0043] S4: Zero cold water

[0044] When the user needs to use hot water, first turn on the faucet, notify the water flow switch to turn on, and the equipment notifies: the return water solenoid valve and the water pump,

[0045] Work, and the working time can be adjusted according to the length of the pipeline. The return water working time can be adjusted from 2 to 8 minutes. When the equipment stops working and uses hot water for the second time, the hot water in the water pipe has not cooled down within 10 - 15 minutes (adjustable). When using hot water equipment, there is no return water. When it exceeds the set time, there is return water when using hot water;

[0046] S5: Temperature control

[0047] Automatically adjust the water tank temperature according to different ambient temperatures:

[0048] When the ambient temperature T1 >= 30 °C, the water tank automatically adjusts the temperature T2 <= 25 °C

[0049] When the ambient temperature 25 <= T1 < 30 °C, the water tank automatically adjusts the temperature T2 <= 30 °C

[0050] When the ambient temperature 20 <= T1 < 25 °C, the water tank automatically adjusts the temperature T2 <= 35 °C

[0051] When the ambient temperature 15 <= T1 < 20 °C, the water tank automatically adjusts the temperature T2 <= 40 °C

[0052] The outlet water temperature is 5 - 20 °C higher than the designed water tank temperature and is adjustable,

[0053] Add a return water pump to the water supply pipeline and complete the return water control with the help of the water flow switch of the equipment:

[0054] When using hot water for the first time, repeat the water supply heating process, turn on the return water pump, and the opening time of the return water pump is set according to the length of the hot water pipe for 2 - 10 minutes (adjustable). After using hot water for the second time and exceeding 10 - 20 minutes (adjustable), the return water pump is turned on.

[0055] Furthermore, in step S1, when the water temperature sensed by the water tank temperature probe is lower than the start value: the dual direct-heating pressurized constant temperature zero cold water pump and solenoid valve are powered on first, and the heat source of the variable heat source works later, and the water enters the water tank after heating and rising in temperature.

[0056] Furthermore, in step S2, when the user uses hot water, the flow switch is turned on, the dual direct-heating pressurized constant temperature zero cold water pump and solenoid valve are de-energized, and the water is sent to the variable heat source by the pressure of tap water. After heating and raising the temperature, the water flows out through the flow switch for the user's use.

[0057] The beneficial effects of this utility model are as follows:

[0058] The dual direct heating constant temperature zero cold water hot water system provided by this utility model has the advantages of low energy consumption, which helps to reduce the cost of use and save energy. Compared with traditional technology, it effectively reduces the cost of use and makes a great contribution to energy conservation and emission reduction in human society. Therefore, this application has great social and economic value. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention, a dual direct heating constant temperature zero cold water hot water system;

[0060] Figure 2 This is a schematic diagram of Embodiment 2 of the present invention, which describes a dual direct heating constant temperature zero cold water hot water system. Detailed Implementation

[0061] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model.

[0062] Example 1

[0063] like Figure 1 As shown, this embodiment describes a dual direct-heating non-pressurized constant-temperature zero-cold-water hot water system. This utility model provides a dual direct-heating constant-temperature zero-cold-water hot water system, including water tanks 100 and 101, and a check valve 1, a water pump 2, a solenoid valve 3, a variable heat source 4, a flow switch 5, an auxiliary instant electric heating device 6, a pipe temperature probe 7, and a return water solenoid valve 8 connected to the water tanks. The water pump 2, solenoid valve 3, variable heat source 4, flow switch 5, auxiliary instant electric heating device 6, and pipe temperature probe 7 are also connected to a controller 9.

[0064] In this embodiment, the bottom of the non-pressurized water tank 100 is sequentially connected to the check valve 1, the water pump 2, the variable heat source 4, and the return water solenoid valve 8. The variable heat source 4 and the solenoid valve 3 are connected to the flow switch 5, the auxiliary instant electric heating device 6, the pipeline temperature probe 7, and the return water solenoid valve 8. The top of the non-pressurized water tank 100 is equipped with a water level switch 10, and the bottom is equipped with a non-pressurized water tank temperature probe 11. The water pump 2 and the variable heat source 4 are also connected to an inlet solenoid valve 12. The auxiliary instant electric heating device 6 is also connected to a hot water temperature probe 17, which is connected to the user U.

[0065] The water pump 2 is also equipped with an inlet proportional regulating valve 13, through which cold water enters;

[0066] An inlet water temperature probe 14 is also connected between the water pump 2 and the heat source 4.

[0067] The variable heat source is equipped with a high-temperature probe 15 at each of the four locations, and also with a water outlet probe 16.

[0068] A booster pump is also connected between the flow switch 5 and the non-pressurized water tank 100.

[0069] The controller 9 is connected to the check valve 1, the water pump 2, the variable heat source 4, the solenoid valve 3, the water flow switch 5, the auxiliary instant electric heating device 6, the pipeline temperature probe 7, the return water solenoid valve 8, and the inlet water solenoid valve 12.

[0070] When the water temperature probe senses a water temperature 2-5 degrees Celsius lower than the set temperature, cold or warm water from the non-pressurized water tank exits through the inlet check valve, is sent to the water pump for pressurization, then to the variable heat source for heating, and finally flows back to the water tank via the solenoid valve, completing the circulating heating process until the set temperature is reached and heating stops.

[0071] When a non-pressurized water tank is not full, the water level switch is activated, and the inlet solenoid valve operates. Water enters the tank using the pressure of the tap water and is heated by the heat source. The water then returns to the tank via the solenoid valve until it is full. When the water temperature drops 2-5 degrees Celsius below the set temperature, it enters a circulation pressurization mode. When the user needs hot water, it enters hot water supply mode, prioritizing hot water supply.

[0072] To ensure a constant shower water temperature, when a user uses hot water, the flow switch is activated, the water pump and the variable-temperature heating source work, the solenoid valve is de-energized, and hot water flows out through the flow switch. After being heated by the auxiliary instantaneous heating element, it is then supplied to the user via the pipe temperature probe. When the water temperature probe shows a low reading, the variable-temperature heating source is increased up to its maximum. If the desired temperature is not reached, the auxiliary instantaneous heating element is activated; conversely, it decreases to ensure a constant water temperature output.

[0073] When the interval between water usages exceeds 8-15 minutes, hot water needs to be returned. When a user uses hot water, they first turn on the tap. At this time, the return water solenoid valve is already working. Cold or warm water is pumped down and heated by a variable heat source before returning to the non-pressurized water tank. The return water time is set to 1-8 minutes. Then, the return water solenoid valve is de-energized to complete the return water process.

[0074] Furthermore, it includes the following steps:

[0075] F1. Water inlet heating:

[0076] When the water tank is low on water, the inlet proportional control valve and the solenoid valve open, while the circulating pump stops working. The heat exchanger operates to heat the water, and the high-temperature probe of the heat exchanger senses the water temperature and adjusts the amount of cold water entering the tank through the inlet proportional control valve to ensure constant temperature water intake until the tank is full.

[0077] F2. Direct heating water inlet conversion:

[0078] When the inlet water flow is low or the water supply is interrupted, the variable heat exchanger will switch to circulating heating when the temperature sensed by the high temperature probe exceeds 95-115° (adjustable) until the water temperature reaches the set point and then stop. When the water tank temperature is lower than the set start-up temperature but the water level is not full, it will switch to direct heating.

[0079] F3. Circulating heating:

[0080] When the water tank temperature is lower than the equipment start value, the circulating water pump and solenoid valve work, followed by the heat exchanger, until the equipment water temperature reaches the set value.

[0081] F4. Water supply heating:

[0082] When a user uses hot water, the flow switch is activated, prioritizing hot water supply. During cold water intake, circulation heating, or winter defrosting, the system stops operating and switches to hot water supply. The proportional control valve and solenoid valve close, the circulation pump operates, and if the pipe temperature probe detects that the water temperature has not reached the set temperature, the auxiliary pipe thermoelectric heating system activates until the set temperature is reached.

[0083] F5. Return water control:

[0084] When hot water is used for the first time, the return water solenoid valve opens, and the water supply and heating process is repeated. The opening time of the return water solenoid valve is set to 2-10 minutes (adjustable) depending on the length of the hot water pipe. When hot water is used for the second time, the return water solenoid valve opens after 10-20 minutes (adjustable).

[0085] Example 2

[0086] like Figure 2As shown in the illustration, this embodiment describes a dual direct-heating pressurized constant-temperature water heater. This utility model provides a dual direct-heating constant-temperature zero-cold-water hot water system, including a pressurized water tank 101. The bottom of the pressurized water tank 101 is sequentially connected to an inlet water temperature probe 1-1, a water pump 1-2, and a solenoid valve 1-3. The solenoid valve 1-3 is connected to the top of the pressurized water tank 101 via a bypass check valve 1-4. The solenoid valve 1-3 is also connected to a variable-heat source 1-5. The variable-heat source 1-5 is connected to a check valve 1-7 and a flow switch 1-8 via a variable-temperature heat exchanger outlet probe 1-6. The check valve 1-7 is connected to the top of the pressurized water tank 101, and the flow switch 1-8 is connected to an auxiliary instantaneous heating element. Heating devices 1-9, including auxiliary instant electric heating devices 1-9, are sequentially connected to hot water temperature probes 1-10 to supply water to user U. Hot water temperature probes 1-10 are also connected to a return water pump 1-11 and a return water check valve 1-12. A flow switch 1-8, auxiliary instant electric heating devices 1-9, and hot water temperature probes 1-10 are also connected to a controller 1-13. Water tank 101 can hold either cold or warm water. When user U needs hot water, flow switch 1-8 is activated, and cold water enters the bottom of pressurized water tank 101 through a flow stabilizer pipe 1-14, then exits through the top of pressurized water tank 101, and is sent to variable heat source 1-5 (1-4) via a bypass check valve. The water is heated to hot water and then supplied to the user via flow switch 1-8. Variable heat source 1-5 is also connected to a variable heat exchanger high-temperature probe 1-15.

[0087] When the water temperature probe senses that the water temperature is 2-5 degrees lower than the set temperature, the cold water in the pressurized water tank enters the bottom outlet of the pressurized water tank through the flow stabilizing pipe, is pressurized by the water pump, passes through the solenoid valve, and is heated into hot water by the heat source. The hot water then returns to the top inlet of the pressurized water tank through the check valve, completing the cycle heating until the set water temperature is reached, at which point the equipment stops heating.

[0088] To ensure a constant shower water temperature, when the user uses hot water, the water flow switch is activated. The dual direct-heating pressurized constant-temperature zero-cold-water water heater utilizes the pressure of the tap water. Cold water enters the bottom of the pressurized water tank through the flow stabilizing pipe and then exits as hot water through the top of the pressurized water tank. The water pump and solenoid valve do not operate. Cold or warm water is heated by the variable heat source and then heated by the auxiliary instantaneous electric heating before being supplied to the user through the pipe temperature probe. When the water temperature is low, the variable heat source is increased until it reaches its maximum. If the temperature is not reached, the auxiliary instantaneous electric heating is activated. Conversely, the temperature is reduced to ensure a constant water temperature output.

[0089] If the interval between water usages exceeds 8-15 minutes, the water pipe temperature will have cooled down, and a backflow system is required when using hot water.

[0090] The solenoid valve needs to be moved from behind the water pump to before it, and the bypass check valve becomes a bypass solenoid valve, with the inlet located between the solenoid valve and the water pump. When the user uses hot water, the flow switch is activated, and the water in the tank is sent to the water pump for pressurization after passing through the bypass solenoid valve. Then, it is sent to the variable heat source for heating, and after passing through the flow switch, auxiliary instantaneous electric heating, and pipe temperature probe, it finally returns to the water tank through the return check valve. The return time is adjustable from 2 to 8 minutes depending on the length of the pipeline. Then, the water pump stops working, completing the zero-cold-water operation.

[0091] Furthermore, it includes the following steps:

[0092] S1: Water tank heating

[0093] The hot water supply to the water tank is completed by the pressure of tap water. Therefore, there are only two processes: water tank heating and water supply heating. When the water temperature is lower than the set value, the water pump and solenoid valve work. Then the variable heat source device also works. The water in the tank is pressurized by the circulation pump, then passes through the solenoid valve, and then is sent to the variable heat source for heating. Then it returns to the water tank through the check valve to complete the circulation heating until the water tank temperature reaches the set value.

[0094] S2: Water supply heating

[0095] When a user uses hot water, the water flow switch is activated, prioritizing the user's hot water usage. If the heat pump is used for winter defrosting, defrosting will stop, and the system will switch to supplying hot water for heating, stopping the circulating heating process. Water from the tank enters the variable heat source equipment via a bypass check valve for heating, and then is supplied to the user. When the water temperature does not reach the set value, the auxiliary pipeline, i.e., thermoelectric heating, is activated to heat the water.

[0096] When the water temperature sensed by the water tank temperature probe is lower than the starting value: the water pump and solenoid valve of the dual direct heating non-pressurized constant temperature zero cold water water heater are powered on and work first, the inlet solenoid valve is powered off to stop the cold water from entering, and the heat source of the heat conversion works later, and after heating and rising, the water enters the water tank to complete the cycle heating.

[0097] S3: Constant Temperature Hot Water

[0098] When a user uses hot water, the water flow switch is activated. If the water temperature sensed by the pipe temperature probe is too low, the variable heat source is notified to increase the heat output. If the maximum heat output is reached but still insufficient to meet the set temperature, auxiliary instantaneous electric heating is activated. If the water temperature sensed by the pipe temperature probe is too high, the equipment operates in the opposite direction, decreasing the flow rate. Simultaneously, the water tank temperature can be adjusted based on the amount of hot water used and the maximum temperature rise of the variable heat source.

[0099] S4: Zero Cold Water

[0100] When a user needs hot water, they first turn on the tap to activate the water flow switch. The equipment then notifies the return water solenoid valve and water pump.

[0101] The working time can be adjusted according to the length of the pipeline, and the return water working time can be adjusted from 2 to 8 minutes. When the equipment stops working and hot water is used for the second time, the time when the hot water in the water pipe has not cooled can be adjusted from 10 to 15 minutes. When using hot water equipment, there is no return water. When the set time is exceeded, return water occurs when using hot water.

[0102] S5: Temperature control

[0103] Automatically adjust the water tank temperature according to different ambient temperatures:

[0104] When the ambient temperature T1 >= 30°C, the water tank automatically adjusts the temperature T2 <= 25°C

[0105] When the ambient temperature 25 <= T1 < 30°C, the water tank automatically adjusts the temperature T2 <= 30°C

[0106] When the ambient temperature 20 <= T1 < 25°C, the water tank automatically adjusts the temperature T2 <= 35°C

[0107] When the ambient temperature 15 <= T1 < 20°C, the water tank automatically adjusts the temperature T2 <= 40°C

[0108] The outlet water temperature is adjustable 5 - 20°C higher than the designed water tank temperature.

[0109] Install a return water pump in the water supply pipeline and complete the return water control with the help of the water flow switch of the equipment:

[0110] When using hot water for the first time, repeat the water supply heating process, turn on the return water pump, and the opening time of the return water pump is set according to the length of the hot water pipe, which can be adjusted from 2 to 10 minutes. After using hot water for the second time, the return water pump is turned on after 10 - 20 minutes (adjustable).

[0111] In this embodiment, in step S1, when the water temperature sensed by the water tank temperature probe is lower than the starting value: the water pump and solenoid valve of the double direct heating pressure - maintaining constant - temperature zero - cold water first conduct electricity to work, and then the variable heat source works. After heating and raising the temperature, it enters the water tank.

[0112] In this embodiment, in step S2, when the user uses hot water and the water flow switch is turned on, the water pump and solenoid valve of the double direct heating pressure - maintaining constant - temperature zero - cold water are powered off, and the water is sent to the variable heat source by the pressure of tap water to work. After heating and raising the temperature, it flows out through the water flow switch for the user to use.

[0113] A double direct heating constant - temperature zero - cold water hot water system provided by the present utility model has the advantages of low energy consumption, helping to reduce the use cost and save energy. Compared with the traditional technology, it effectively reduces the use cost, and at the same time makes great contributions to energy conservation and emission reduction in human society. Therefore, this application has great social value and economic value.

[0114] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A dual direct-heating constant-temperature zero-cold-water hot water system, characterized in that: It includes a water tank and a check valve, a water pump, a solenoid valve, a variable heat source, a flow switch, an auxiliary instant electric heating device, a pipeline temperature probe, and a return water solenoid valve connected to the water tank. The water pump, solenoid valve, variable heat source, flow switch, auxiliary instant electric heating device, and pipeline temperature probe are also connected to a controller.

2. The dual direct-heating constant-temperature zero-cold-water hot water system according to claim 1, characterized in that: The water tank includes pressurized water tanks and non-pressurized water tanks.

3. A dual direct-heating constant-temperature zero-cold-water hot water system according to claim 2, characterized in that: The bottom of the non-pressurized water tank is sequentially connected to the check valve, the water pump, the variable heat source, and the return water solenoid valve. A flow switch, an auxiliary instantaneous electric heater, a pipeline temperature probe, and the return water solenoid valve are connected between the variable heat source and the solenoid valve. A water level switch is located at the top of the non-pressurized water tank, and a non-pressurized water tank temperature probe is located at the bottom. An inlet solenoid valve is also connected between the water pump and the variable heat source, and an inlet proportional regulating valve is also located at the water pump. An inlet water temperature probe is also connected between the water pump and the heat source. The variable heat source is equipped with a high-temperature probe for a variable heat exchanger. A booster pump is also connected between the flow switch and the non-pressurized water tank. The controller is connected to the check valve, the water pump, the variable heat source, the solenoid valve, the flow switch, the auxiliary instantaneous electric heater, the pipeline temperature probe, the return water solenoid valve, and the inlet water solenoid valve.

4. A dual direct-heating constant-temperature zero-cold-water hot water system according to claim 3, characterized in that: The bottom of the pressurized water tank is sequentially connected to an inlet water temperature probe, a water pump, and a solenoid valve. The solenoid valve is connected to the top of the pressurized water tank via a bypass check valve. The solenoid valve is also connected to a variable heat source. The variable heat source is connected to a check valve and a flow switch via a variable heat exchanger outlet probe. The check valve is connected to the top of the pressurized water tank. The flow switch is connected to an auxiliary instant electric heating device. The auxiliary instant electric heating device is sequentially connected to a hot water temperature probe to supply water to the user. The hot water temperature probe is also connected to a return water pump and a return water check valve. The flow switch, the auxiliary instant electric heating device, and the hot water temperature probe are also connected to a controller.

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