Double-direct-heating constant-temperature zero cold water and hot water system and heating and control method thereof

Abstract

The invention provides a double-direct-heating constant-temperature zero cold water and hot water system which comprises a water tank, a check valve, a water pump, an electromagnetic valve, a variable heat source, a water flow switch, auxiliary instant electric heating equipment, a pipeline temperature probe and a water return electromagnetic valve, the water pump, the electromagnetic valve, the variable-heat heat source, the water flow switch, the auxiliary instant electric heating equipment and the pipeline temperature probe are further connected with a controller, the double-direct-heating constant-temperature zero cold water and hot water system and the heating and control method thereof have the advantages of being low in energy consumption and beneficial to reducing use cost and saving energy, and compared with a traditional technology, the double-direct-heating constant-temperature zero cold water and hot water system has the advantages of being high in practicability. The use cost is effectively reduced, meanwhile, great contribution is made to energy conservation and emission reduction of the human society, and therefore the system has great social value and economic value.

Description

Technical Field

[0001] The invention relates to the technical field of loudspeaker design, and in particular to a dual direct-heating constant-temperature zero-cold-water hot water system. Background Art

[0002] Energy conservation and emission reduction is the development direction advocated by the country, and products with less energy consumption will be a direction of future development. As low-energy products, solar water heaters and air-energy water heaters have a good development momentum. However, due to some limitations of the products themselves, the products have certain limitations in meeting consumer needs, so comprehensive energy utilization has become another direction for the development of water heaters. The water heater evaluation website believes that as new energy products, solar water heaters and air-energy water heaters are showing a strong development momentum. The two categories are rapidly expanding the market due to their unique performance and have a strong response among consumers. In the solar water heater market, 2009, 2010 and 2011 were three years of ups and downs in the solar water heater industry. In 2009, under the strong promotion of the policy of home appliances going to the countryside, the solar water heater industry ushered in the long-awaited rapid development. However, solar water heater companies, which were immersed in the joy of great development for a short time, found that with the expansion of the home appliance going to the countryside team, market competition became more and more severe, and the growth rate of the industry slowed down significantly in 2010. As of 2011, with the global economy bottoming out and a series of domestic policy adjustments, solar water heaters, which are already in the early stages of development, are experiencing a market downturn, just like many household appliances. As people's living standards are improving, their requirements for comfort in family life are also getting higher and higher. The various electrical products that come with it have made human life more convenient while also occupying a lot of space. For this reason, more and more multifunctional electrical appliances have entered people's lives. Water heaters are also experiencing different generations of development. However, water heaters in the existing technology still have many shortcomings, such as high energy consumption and high cost of use, which need further improvement. Summary of the invention

[0003] In view of the above-mentioned deficiencies of the prior art, the present invention provides a dual direct heating constant temperature zero cold water hot water system and a heating and control method thereof which has low energy consumption, helps to reduce use costs and save energy.

[0004] The specific technical solutions of the present invention are as follows:

[0005] The present invention provides a dual direct heating constant temperature zero cold water hot water system, comprising a water tank and a check valve, a water pump, a solenoid valve, a variable heat source, a water flow switch, an auxiliary thermoelectric heating device, a pipeline temperature probe and a return water solenoid valve connected to the water tank. The water pump, the solenoid valve, the variable heat source, the water flow switch, the auxiliary thermoelectric heating device and the pipeline temperature probe are also connected to a controller.

[0006] Further, the water tank includes a pressure-bearing water tank and a non-pressure-bearing water tank.

[0007] Further, a check valve, a water pump, a variable heat source, and a water outlet solenoid valve are sequentially connected to the bottom of the non-pressure-bearing water tank. A water flow switch, an auxiliary instantaneous electric heater, a pipeline temperature probe, and a return water solenoid valve are connected between the variable heat source and the solenoid valve. A water level switch is provided at the top of the non-pressure-bearing water tank, and a non-pressure-bearing water tank temperature probe is provided at the bottom end. 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 temperature probe is also connected between the water pump and the variable heat source.

[0009] A variable heat exchanger high-temperature probe is provided at the variable heat source.

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

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

[0012] Further, an inlet temperature probe, a water pump, and a solenoid valve are sequentially connected to the bottom of the pressure-bearing water tank. The solenoid valve is connected to the top of the pressure-bearing water tank through 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 water flow switch through a variable heat exchanger outlet probe. The check valve is connected to the top of the pressure-bearing water tank. The water flow switch is connected to an auxiliary instantaneous electric heating device. The auxiliary instantaneous electric heating device is sequentially connected to a hot water temperature probe to supply water to users. The hot water temperature probe is also connected to a return water pump and a return water check valve. The water flow switch, the auxiliary instantaneous electric heating device, and the hot water temperature probe are also connected to the controller.

[0013] Further, when a user uses hot water, the water flow switch is turned on. Cold or warm water in the water tank is sent from the bottom outlet of the water tank to the water pump for pressurization through the check valve, and then sent to the variable heat source for heating, and then flows through the user after passing through the water flow switch.

[0014] When the water temperature probe in the water tank senses that the water temperature is 2 - 5 degrees lower than the set temperature, cold or warm water in the non-pressure-bearing water tank flows out from the inlet check valve, is sent to the water pump for pressurization, and then sent to the variable heat source for heating, and then flows back to the water tank through the solenoid valve to complete the circulating heating until the temperature reaches the set temperature and then the heating stops.

[0015] When the non-pressure-bearing water tank is not full, the water level switch is turned on, and the inlet solenoid valve works. With the pressure of tap water, it enters the variable heat source to be heated, and then returns to the water tank through the solenoid valve until the water is full. When the water temperature is 2-5 degrees lower than the set temperature, it enters the circulating pressurization mode. When the user uses hot water, it enters the hot water supply mode with priority given to hot water supply.

[0016] To ensure the constant temperature of the shower water temperature, when the user uses hot water, the water flow switch is turned on, the water pump works, and the variable heat source also works. The solenoid valve is powered off, and the hot water flows out through the water flow switch, is heated by the auxiliary instantaneous electric heater, and then is supplied to the user through the pipe temperature probe. When the water temperature of the pipe temperature probe is low, the variable heat source is adjusted to a larger value until it reaches the maximum. If the temperature is not reached, the auxiliary instantaneous electric heater can be started, and vice versa to make it smaller to ensure the constant temperature output of the water temperature.

[0017] When the water usage interval is longer than 8-15 minutes and hot water is used, water return is required. When the user uses hot water, first turn on the faucet. At this time, the water return solenoid valve has already worked. Under the pressure of the water pump, cold water or warm water is heated through the variable heat source and then returned to the non-pressure-bearing water tank. The water return time is determined to be 1-8 minutes, and then the water return solenoid valve is powered off to complete the water return.

[0018] Furthermore, it includes the following steps:

[0019] F1. Inlet water heating:

[0020] When the water tank is short of water, the inlet proportion regulating valve and the solenoid valve are opened, while the circulation pump does not work, and the variable heat device works for heating. The high-temperature temperature probe of the heat exchanger senses the water temperature, and adjusts the cold water size of the inlet proportion regulating valve to ensure constant temperature inlet water until the water is full.

[0021] F2. Direct heating inlet conversion:

[0022] When the inlet water volume is small or there is a water supply interruption, when the high-temperature probe of the variable heat exchanger senses that the temperature exceeds 95-115° (adjustable), it is converted to circulating heating until the water temperature reaches the set value and then stops. When the water tank temperature is lower than the set start temperature and the water level is not full, it is only then converted to a direct heating machine.

[0023] F3. Circulating heating:

[0024] When the water tank temperature is lower than the equipment start value, the circulation water pump and the solenoid valve work, and then the variable heat exchanger also works until the equipment water temperature reaches the set value.

[0025] F4. Water supply heating:

[0026] When the user uses hot water, it triggers the water flow switch to work. With priority given to the user using hot water, when cold water enters, circulating heating, or the heat pump defrosts in winter, they all stop working and are converted to water supply heating. The proportion regulating valve and the solenoid valve are closed, the circulation pump works, the pipeline temperature probe senses that the water temperature has not reached the set water temperature, and the auxiliary pipeline instantaneous electric heater works until the set temperature is reached.

[0027] F5. Return water control:

[0028] When using hot water 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 according to the length of the hot water pipe for 2 - 10 minutes (adjustable). When using hot water for the second time for more than 10 - 20 minutes (adjustable), the return water solenoid valve opens.

[0029] Furthermore, it includes the following steps:

[0030] The water tank can hold cold water or warm water. When the user uses hot water, the water flow switch is turned on. Cold water enters the bottom of the pressure-bearing water tank through the steady flow pipe, then exits from the top of the pressure-bearing water tank, is sent to the variable heat source through the bypass check valve, heated into hot water, and then supplied to the user through the water flow switch.

[0031] When the water temperature probe in the water tank senses that the water temperature is 2 - 5 degrees lower than the set temperature, the cold water in the pressure-bearing water tank enters the bottom outlet of the pressure-bearing water tank through the steady flow pipe, is pressurized by the water pump, passes through the solenoid valve, then reaches the variable heat source to be heated into hot water, and returns to the top inlet of the pressure-bearing water tank through the check valve to complete the circulating heating until the set water temperature is reached, and the equipment stops heating.

[0032] To ensure the constant temperature of the shower water temperature, when the user uses hot water, the water flow switch is turned on. The double-direct-heating pressure-bearing constant-temperature zero-cold-water water heater utilizes the pressure of tap water. Cold water enters the bottom of the pressure-bearing water tank through the steady flow pipe, and then hot water exits from the high end of the pressure-bearing water tank. The water pump and the solenoid valve do not work. Cold water or warm water is heated into hot water through the variable heat source, then through the auxiliary instant electric heating, and then supplied to the user through the pipe temperature probe. When the water temperature of the pipe temperature probe is low, the variable heat source is adjusted to a larger value until it reaches the maximum. If the temperature is not reached, the auxiliary instant electric heating can be started, and vice versa to become smaller to ensure the constant temperature output of the water temperature.

[0033] When the water usage interval is longer than 8 - 15 minutes and the temperature of the water pipe has dropped, it is necessary to return water when using hot water.

[0034] It is necessary to move the solenoid valve from behind the water pump to in front of the water pump. The bypass check valve becomes a bypass solenoid valve, and the inlet is between the solenoid valve and the water pump. When the user uses hot water, the water flow switch is turned on. The water in the water tank is sent to the water pump for pressurization through the bypass solenoid valve, then sent to the variable heat source to increase the temperature, passes through the water flow switch, the auxiliary instant electric heating, the pipe temperature probe, and finally returns to the water tank through the return water check valve. According to the length of the pipeline, the return water time is determined to be adjustable for 2 - 8 minutes, and then the water pump stops working to complete the zero-cold-water operation.

[0035] Furthermore, it includes the following steps:

[0036] S1: Water tank heating

[0037] The hot water supply of 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. Immediately afterwards, the variable heat source device also works. The water in the water tank is pressurized by the circulation pump, then passes through the solenoid valve, and then is sent to the variable heat source for heating. After that, it returns to the water tank through the check valve to complete the circulating heating until the water temperature in the water tank reaches the set value;

[0038] S2: Water supply heating

[0039] When the user uses hot water, the water flow switch is triggered to work, with the priority of the user using hot water. If it is the heat pump defrosting in winter, the defrosting will stop, and it will switch to water supply heating and stop the circulating heating. The water in the water tank enters the variable heat source device through the 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, that is, the electrothermal heating, is started to heat the hot water.

[0040] When the water temperature sensed by the water temperature probe in the water tank is lower than the startup value: the water pump and solenoid valve of the double direct heating non-pressure constant temperature zero cold water heater are energized and work first. The inlet solenoid valve is de-energized to stop the cold water from entering. The variable 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, when the water temperature sensed by the pipeline temperature probe is relatively low, it notifies the variable heat source to increase the heat. When it reaches the maximum and still cannot meet the set temperature, then the auxiliary, that is, the electrothermal heating, is started. When the water temperature sensed by the pipeline temperature probe is relatively high, the device operates in the opposite direction of decreasing. At the same time, the water temperature in the water tank can be adjusted according to the amount of hot water used and the maximum temperature rise of the variable heat source.

[0043] S4: Zero cold water

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

[0045] They work, and the working time can adjust the return water working time according to the length of the pipeline, which is adjustable from 2 to 8 minutes. When the device stops working and uses hot water for the second time, within the adjustable time of 10 - 15 minutes when the hot water in the water pipe has not cooled down, the hot water using device does not return water. When it exceeds the set time, it returns 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 degrees, the water tank automatically adjusts the temperature T2 <= 25 degrees

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

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

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

[0052] The outlet water temperature is adjustable 5 - 20 degrees higher than the designed water tank temperature

[0053] A return water pump is added to the water supply pipeline, and the return water control is completed with the help of the water flow switch of the device:

[0054] When using hot water for the first time, the process of repeated water supply and heating is carried out. The return water pump is turned on, 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, the return water pump is turned on after more than 10 - 20 minutes (adjustable).

[0055] Further, in step S1, when the water temperature sensed by the water tank temperature probe is lower than the starting value: the pump and solenoid valve of the double direct heating, pressure-bearing, constant temperature and zero cold water first energize and work, and then the variable heat source works. After heating and rising in temperature, it enters the water tank.

[0056] Further, in step S2, when the user uses hot water and the water flow switch is turned on, the pump and solenoid valve of the double direct heating, pressure-bearing, constant temperature and zero cold water are powered off, and it is sent to the variable heat source by the pressure of tap water and then works. After heating and rising in temperature, it flows out through the water flow switch for the user to use.

[0057] The beneficial effects of the present invention are as follows:

[0058] The double direct heating, constant temperature and zero cold water hot water system and its heating and control method provided by the present invention have the advantages of low energy consumption, helping to reduce the use cost and saving energy. Compared with the traditional technology, the use cost is effectively reduced, and at the same time, it has made great contributions to energy conservation and emission reduction in human society. Therefore, this application has great social value and economic value. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0060] Figure 2 It is the schematic diagram of Embodiment 2 of a double direct heating, constant temperature and zero cold water hot water system of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0061] The following specifically illustrates the implementation manner of the present invention in conjunction with the drawings. The drawings are only for reference and explanation, and do not constitute a limitation to the protection scope of the patent of the present invention.

[0062] Embodiment 1

[0063] AsFigure 1 As shown in Figure 1 , in this embodiment, a double-direct-heating non-pressure constant-temperature zero-cold-water hot water system is described. The present invention provides a double-direct-heating constant-temperature zero-cold-water hot water system, which includes a water tank and a check valve, a water pump, a solenoid valve, a variable-heat source, a water 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, the solenoid valve, the variable-heat source, the water flow switch, the auxiliary instant electric heating device, and the pipeline temperature probe are also connected to a controller.

[0064] In this embodiment, the bottom of the non-pressure water tank is sequentially connected with the check valve, the water pump, the variable-heat source, and the outlet solenoid valve. The water flow switch, the auxiliary instant electric heating, the 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 provided at the top of the non-pressure water tank, and a non-pressure water tank temperature probe is provided at the bottom end. An inlet solenoid valve is also connected between the water pump and the variable-heat source.

[0065] An inlet proportional regulating valve is also provided at the water pump.

[0066] An inlet temperature probe is also connected between the water pump and the variable-heat source.

[0067] A variable heat exchanger high-temperature probe is provided at the variable-heat source.

[0068] A pressure pump is also connected between the water flow switch and the non-pressure water tank.

[0069] The controller is connected to the check valve, the water pump, the variable-heat source, the solenoid valve, the water flow switch, the auxiliary instant electric heating, the pipeline temperature probe, the return water solenoid valve, and the inlet solenoid valve.

[0070] When the water temperature probe of the water tank senses that the water temperature is 2 - 5 degrees lower than the set temperature, the cold water or warm water in the non-pressure water tank flows out from the inlet check valve, is sent to the water pump for pressurization, then sent to the variable-heat source for heating, and then flows back to the water tank through the solenoid valve to complete the circulating heating until the temperature reaches the set temperature and then the heating stops.

[0071] When the non-pressure water tank is not full of water, the water level switch is turned on, and the inlet solenoid valve works. The water enters the variable-heat source to be heated up by means of the pressure of tap water, and then returns to the water tank through the solenoid valve until the water is full. When the water temperature is 2 - 5 degrees lower than the set temperature, it enters the circulating pressurization mode. When the user uses hot water, it enters the hot water supply mode with hot water supply taking priority.

[0072] To ensure a constant temperature of the shower water, when the user uses hot water, the water flow switch is turned on, the water pump works, the variable heat source also works, the solenoid valve is powered off, the hot water flows out through the water flow switch, is heated by the auxiliary instantaneous electric heater, and then is supplied to the user through the pipe temperature probe. When the water temperature detected by the pipe temperature probe is low, the variable heat source is adjusted to a larger value until it reaches the maximum. If the set temperature is not reached, the auxiliary instantaneous electric heater can be started. Conversely, it is adjusted to a smaller value to ensure a constant temperature output of the water.

[0073] When the time interval between water uses is longer than 8 - 15 minutes, water return is required when using hot water. When the user uses hot water, first turn on the faucet. At this time, the water return solenoid valve is already working. Under the pressure of the water pump, cold water or warm water is heated by the variable heat source and then returned to the non - pressurized water tank. The water return time is determined to be 1 - 8 minutes, and then the water return solenoid valve is powered off to complete the water return.

[0074] Furthermore, it includes the following steps:

[0075] F1. Water inlet heating:

[0076] When the water tank is short of water, the water inlet proportion regulating valve and the solenoid valve are opened, while the circulation pump does not work, and the variable heat device works for heating. The high - temperature temperature probe of the heat exchanger senses the water temperature and adjusts the amount of cold water of the water inlet proportion regulating valve to ensure a constant - temperature water inlet until the water tank is full.

[0077] F2. Direct - heat inlet conversion:

[0078] When the water inlet volume is small or there is a water stop, when the temperature sensed by the high - temperature probe of the variable heat exchanger exceeds 95 - 115° (adjustable), it is converted to circulating heating until the water temperature reaches the set value and then stops. When the water tank temperature is lower than the set start temperature and the water level is not full, it is only then converted to a direct - heat machine.

[0079] F3. Circulating heating:

[0080] When the water tank temperature is lower than the equipment start value, the circulation water pump and the solenoid valve work, and then the variable heat exchanger also works until the equipment water temperature reaches the set value.

[0081] F4. Water supply heating:

[0082] When the user uses hot water, the water flow switch is triggered to work. With the priority of the user using hot water, when cold water enters, circulating heating or heat pump winter defrosting occurs, all stop working and switch to water supply heating. The proportion regulating valve and the solenoid valve are closed, the circulation pump works, and the pipe temperature probe senses that the water temperature has not reached the set water temperature, and the auxiliary pipe instantaneous electric heater works until the set temperature is reached.

[0083] F5. Water return control:

[0084] When using hot water 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 according to the length of the hot water pipe for 2 - 10 minutes (adjustable). When using hot water for the second time and exceeding 10 - 20 minutes (adjustable), the return water solenoid valve opens.

[0085] Embodiment 2

[0086] As Figure 2 shown, in this embodiment, a double direct heating and pressure-bearing constant temperature water heater is described. The present invention provides a double direct heating constant temperature zero cold water hot water system, including a pressure-bearing water tank. An inlet water temperature probe, a water pump, and a solenoid valve are sequentially connected to the bottom of the pressure-bearing water tank. The solenoid valve is connected to the top of the pressure-bearing water tank through 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 water flow switch through a variable heat exchanger outlet probe. The check valve is connected to the top of the pressure-bearing water tank. The water flow switch is connected to an auxiliary instantaneous electric heating device. The auxiliary instantaneous electric heating device is sequentially connected to a hot water temperature probe to supply water to users. The hot water temperature probe is also connected to a return water pump and a return water check valve. The water flow switch, the auxiliary instantaneous electric heating device, and the hot water temperature probe are also connected to a controller. The water tank can hold cold water or warm water. When users use hot water, the water flow switch is turned on. Cold water enters the bottom of the pressure-bearing water tank through a steady flow pipe, then exits from the top of the pressure-bearing water tank, and is sent to the variable heat source through a bypass check valve, heated into hot water, and then supplied to users through the water flow switch.

[0087] When the water temperature probe in the water tank senses that the water temperature is 2 - 5 degrees lower than the set temperature, the cold water in the pressure-bearing water tank enters the bottom end outlet of the pressure-bearing water tank through a steady flow pipe, is pressurized by a water pump, passes through the solenoid valve, and then reaches the variable heat source to be heated into hot water, and returns to the top inlet of the pressure-bearing water tank through a check valve to complete the circulating heating until the set water temperature is reached and the device stops heating.

[0088] To ensure the constant temperature of the shower water temperature, when users use hot water, the water flow switch is turned on. The double direct heating and pressure-bearing constant temperature zero cold water water heater utilizes the pressure of tap water. Cold water enters the bottom end of the pressure-bearing water tank through a steady flow pipe, and then hot water exits from the high end of the pressure-bearing water tank. The water pump and the solenoid valve do not work. Cold water or warm water is heated into hot water by the variable heat source, then passes through the auxiliary instantaneous electric heating and is supplied to users through the pipe temperature probe. When the water temperature of the pipe temperature probe is low, the variable heat source is adjusted to the maximum until the temperature is not reached, and the auxiliary instantaneous electric heating can be started. Conversely, it becomes smaller to ensure the constant temperature output of the water temperature.

[0089] When the water usage interval is longer than 8 - 15 minutes and the temperature of the water pipe has dropped, it is necessary to return the water when using hot water.

[0090] The solenoid valve needs to be moved from behind the water pump to in front of the water pump. The bypass check valve becomes a bypass solenoid valve, and the inlet is between the solenoid valve and the water pump. When the user uses hot water, the water flow switch is turned on. The water in the water tank is sent to the water pump for pressurization after passing through the bypass solenoid valve, and then sent to the variable heat source for heating up. After passing through the water flow switch, the auxiliary instantaneous electric heating, and the pipe temperature probe, it finally returns to the water tank through the return check valve. According to the length of the pipeline, the return water time can be adjusted from 2 to 8 minutes, and then the water pump stops working to complete the zero cold water operation.

[0091] Furthermore, it includes the following steps:

[0092] S1: Water tank heating

[0093] The hot water supply of 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 the solenoid valve work, and then the variable heat source device also works. The water in the water tank is pressurized by the circulation pump, then passes through the solenoid valve, and then is sent to the variable heat source for heating, and then returns to the water tank through the check valve to complete the circulating heating until the water tank temperature reaches the set value;

[0094] S2: Water supply heating

[0095] When the user uses hot water, it triggers the water flow switch to work, giving priority to the user's use of hot water. If it is the heat pump defrosting in winter, the defrosting will stop, switch to water supply heating, and stop the circulating heating. The water in the water tank enters the variable heat source device for heating through the bypass check valve, and then is supplied to the user. When the water temperature does not reach the set value, the auxiliary pipeline instantaneous electric heating is started to heat the hot water.

[0096] When the water temperature sensed by the water tank temperature probe is lower than the startup value: the water pump and the 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 powered off to stop the cold water inlet, and the variable heat source works later. After heating up, it enters the water tank to complete the circulating heating;

[0097] S3: Constant temperature hot water

[0098] When the user uses hot water and the water flow switch is turned on, when the water temperature sensed by the pipeline temperature probe is relatively low, it notifies the variable heat source to increase the heat. When it reaches the maximum and still cannot meet the set temperature, then the auxiliary instantaneous electric heating is started. When the water temperature sensed by the pipeline temperature probe is relatively high, the device 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 source.

[0099] S4: Zero cold water

[0100] When the user needs to use hot water, first turn on the faucet, notify the water flow switch to turn on, and the device notifies: the return water solenoid valve and the water pump.

[0101] Working, 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 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, there is return water 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 degrees, the water tank automatically adjusts the temperature T2 <= 25 degrees

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

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

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

[0108] The outlet water temperature is adjustable 5 - 20 degrees higher than the designed water tank temperature,

[0109] A return water pump is added to the water supply pipeline, and the return water control is completed by means of the water flow switch of the equipment:

[0110] When using hot water for the first time, repeat the water supply and heating process. The return water pump is turned on, 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 startup value: the water pump and solenoid valve of the double direct heating and pressure-bearing constant temperature zero cold water first energize and work, and then the variable heat source works. After heating and rising in 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 and pressure-bearing constant temperature zero cold water are powered off, and it is sent to the variable heat source by the pressure of tap water and then works. After heating and rising in 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 and its heating and control method provided by the present invention have 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 invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

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 water flow switch, an auxiliary thermoelectric heating device, a pipeline temperature probe and a return water solenoid valve connected to the water tank. The water pump, the solenoid valve, the variable heat source, the water flow switch, the auxiliary thermoelectric heating device and the pipeline temperature probe are also connected to a controller.

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

3. A dual direct heating constant temperature zero cold water hot water system according to claim 1, characterized in that: The bottom of the non-pressure water tank is connected with the check valve, the water pump, the variable heat source and the water outlet solenoid valve in sequence, the water flow switch, the auxiliary thermoelectric heater, the pipeline temperature probe and the return water solenoid valve are connected between the variable heat source and the solenoid valve, the top of the non-pressure water tank is provided with a water level switch, the bottom is provided with a non-pressure water tank temperature probe, the water pump and the variable heat source are also connected with a water inlet solenoid valve, and the water pump is also provided with a water inlet ratio regulating valve. A water inlet temperature probe is also connected between the water pump and the variable heat source. The variable heat source is provided with a variable heat exchanger high temperature probe. A pressure pump is also connected between the water flow switch and the non-pressure water tank. The controller is connected to the check valve, the water pump, the variable heat source, the solenoid valve, the water flow switch, the auxiliary thermoelectric heater, the pipeline temperature probe, the return water solenoid valve and the water inlet solenoid valve.

4. A dual direct heating constant temperature zero cold water hot water system according to claim 1, characterized in that: The bottom of the pressure water tank is connected in sequence with an inlet water temperature probe, a water pump, and a solenoid valve, the solenoid valve is connected to the top of the pressure water tank through 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 water flow switch through a variable heat exchanger water outlet probe, the check valve is connected to the top of the pressure water tank, the water flow switch is connected to an auxiliary thermoelectric heating device, the auxiliary thermoelectric heating device is connected in sequence with a hot water temperature probe to supply water to users, the hot water temperature probe is also connected to a return water pump and a return water check valve, the water flow switch, the auxiliary thermoelectric heating device, and the hot water temperature probe are also connected to a controller.

5. A dual direct heating constant temperature zero cold water hot water system heating method, characterized in that: The steps include: When the user uses hot water, the water flow switch is turned on, and the cold or warm water in the water tank is sent to the water pump for pressurization from the bottom outlet of the water tank through the check valve, and then sent to the variable heat source for heating, and then flows through the water flow switch to the user for use. When the water temperature sensed by the water tank temperature probe is 2-5 degrees lower than the set temperature, the cold water or warm water in the non-pressurized water tank flows out from the water inlet check valve, is sent to the water pump for pressurization, and then sent to the variable heat source for heating, and then flows back to the water tank through the solenoid valve to complete the cycle heating until the temperature reaches the set temperature and the heating stops. When the non-pressure water tank is not full of water, the water level switch is turned on, the water inlet solenoid valve works, and the water enters the variable heat source with the help of the pressure of the tap water to increase the temperature, and then returns to the water tank through the solenoid valve until the water is full. When the water temperature is 2-5 degrees lower than the set temperature, it enters the circulation pressurization. When the user uses hot water, it enters the hot water supply mode, giving priority to hot water supply. To ensure constant shower water temperature, when the user uses hot water, the water flow switch is turned on, the water pump works, the variable heat source also works, the solenoid valve is powered off, hot water flows out through the water flow switch, and is heated by the auxiliary thermoelectric heating device before being supplied to the user through the pipe temperature probe. When the water temperature of the pipe temperature probe is low, the variable heat source is increased to the maximum. If the temperature is not reached, the auxiliary thermoelectric heating device can be started, otherwise it will be reduced to ensure constant water temperature output. When the time interval between water use exceeds 8-15 minutes, water return is required when using hot water. When the user uses hot water, first open the faucet. At this time, the return solenoid valve is already working. Under the pressure of the water pump, the cold water or warm water is heated by the variable heat source and then returns to the non-pressure water tank. The return time is determined to be 1-8 minutes, and then the return solenoid valve is powered off to complete the return.

6. A dual direct heating constant temperature zero cold water hot water system heating method according to claim 5, characterized in that: The steps include: F1. Water heating: When the water tank is short of water, the water inlet ratio regulating valve and the solenoid valve are opened, while the circulating pump does not work, the variable heat device works to heat, the high temperature probe of the heat exchanger senses the water temperature, and adjusts the cold water volume of the water inlet ratio regulating valve to ensure constant temperature water inlet until the water is full; F2. Direct heating water inlet conversion: When the water inflow is small or the water supply is cut off, when the temperature sensed by the high temperature probe of the variable heat exchanger exceeds 95-115° (adjustable), it will switch to circulating heating until the water temperature reaches the set start temperature and then shut down. When the water tank temperature is lower than the set start temperature and the water level is not full, it will switch to direct heating. F3. Circulation heating: When the water tank temperature is lower than the equipment startup value, the circulating water pump and the solenoid valve will work, and then the variable heat exchanger will also work until the equipment water temperature reaches the set value; F4. Water supply heating: When the user uses hot water, the water flow switch is triggered to work, giving priority to the user's use of hot water. When cold water is added, circulating heating or heat pump defrosting in winter, it stops working and switches to water supply heating. The proportional control valve and solenoid valve are closed, the circulating pump works, and the pipe temperature probe senses that the water temperature has not reached the set water temperature. The auxiliary pipe, that is, the thermoelectric heating, works until the set temperature is reached; F5. Backwater control: When hot water is used for the first time, the return solenoid valve opens and the water supply and heating process is repeated. The return solenoid valve opening time is set to 2-10 minutes (adjustable) according to the length of the hot water pipe. The return solenoid valve opens when hot water is used for the second time for more than 10-20 minutes (adjustable).

7. A dual direct heating constant temperature zero cold water hot water system heating method according to claim 5, characterized in that: The steps include: The water tank can be filled with cold water or warm water. When the user uses hot water, the water flow switch is turned on, and the cold water enters the bottom of the pressure water tank through the flow stabilizing pipe, and then flows out from the top of the pressure water tank, and is sent to the variable heat source through the bypass check valve, heated into hot water, and then supplied to the user through the water flow switch. When the water temperature sensed by the water tank temperature probe is 2-5 degrees lower than the set temperature, the cold water in the pressure water tank enters the bottom outlet of the pressure 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 variable heat source. It returns to the top inlet of the pressure water tank through the check valve to complete the cycle heating until the set water temperature is reached and the equipment stops heating. To ensure constant shower water temperature, when the user uses hot water, the water flow switch is turned on. The dual direct heat pressure constant temperature zero cold water water heater uses the pressure of tap water. Cold water enters the bottom of the pressure water tank through the flow stabilizing pipe, and then the hot water is discharged through the high end of the pressure water tank. The water pump and the solenoid valve do not work. The cold water or warm water is heated by the variable heat source and then heated by the auxiliary thermoelectric heating and then through the pipe temperature probe for users to use. When the water temperature of the pipe temperature probe is low, the variable heat source is increased to the maximum. If the temperature is not reached, the auxiliary thermoelectric heating can be started, otherwise it will be reduced to ensure constant water temperature output. When the interval between water use exceeds 8-15 minutes, the water pipe temperature has dropped and the hot water needs to be returned. The solenoid valve needs to be moved from behind the water pump to in front of the water pump, and the bypass check valve becomes a bypass solenoid valve, and the inlet is between the solenoid valve and the water pump. When the user uses hot water, the water flow switch is turned on, and the water in the water tank is sent to the water pump for pressurization after the bypass solenoid valve, and then sent to the variable heat source for heating, and then through the water flow switch, auxiliary thermoelectric heating, pipe temperature probe, and finally returned to the water tank through the return water check valve. According to the length of the pipeline, the return water time is determined to be adjustable from 2 to 8 minutes, and then the water pump stops working to complete the zero cold water work.

8. A dual direct heating constant temperature zero cold water hot water system heating method according to claim 7, characterized in that: The steps include: S1: Water tank heating The hot water supply of the water tank is completed by the pressure of tap water, so 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 the solenoid valve work, and then the variable heat source equipment also works. The water in the water tank is pressurized by the circulation pump, and then passes through the solenoid valve, and then sent to the variable heat source for heating, and then returns to the water tank through the check valve, completing the circulation heating until the water tank temperature reaches the set value; S2: Water heating When the user uses hot water, the water flow switch is triggered to work, giving priority to the user's use of hot water. If the heat pump is defrosting in winter, the defrosting will stop, and the water supply will be heated, and the circulating heating will stop. The water in the water tank enters the variable heat source device through the bypass check valve for heating, and then is used by the user. When the water temperature does not reach the set value, the auxiliary pipeline, that is, the thermoelectric heating, is started to heat the hot water. When the water temperature sensed by the water tank temperature probe is lower than the start value: the water pump and solenoid valve of the dual direct heating non-pressure constant temperature zero cold water water heater are powered on and work first, the water inlet solenoid valve is powered off and stops the cold water from entering, and then works after the heat source is changed to heat, and then enters the water tank after heating and heating, completing the cycle heating; S3: Constant temperature hot water When the user uses hot water, the water flow switch is turned on. If the water temperature sensed by the pipe temperature probe is too low, the variable heat source is notified to increase the heat. When the maximum temperature is reached, it still cannot meet the set temperature. Then the auxiliary thermoelectric heating is started. If the water temperature sensed by the pipe temperature probe is too high, 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 source. S4: Zero cold water When the user needs hot water, he first turns on the faucet, notifies the water flow switch to turn on, and the equipment notifies: the return water solenoid valve and the water pump, Working, the working time can be adjusted according to the length of the pipeline. The return working time can be adjusted from 2 to 8 minutes. When the equipment stops working, when using hot water for the second time, the hot water in the water pipe has not cooled down for an adjustable time of 10 to 15 minutes. The hot water equipment does not return water. If the set time is exceeded, water will return when using hot water. S5: Temperature Control Automatically adjust the water tank temperature according to different ambient temperatures: When the ambient temperature T1 >= 30 degrees, the water tank automatically adjusts the temperature T2 <= 25 degrees When the ambient temperature 25 <= T1 < 30 degrees, the water tank automatically adjusts the temperature T2 <= 30 degrees When the ambient temperature 20 <= T1 < 25 degrees, the water tank automatically adjusts the temperature T2 <= 35 degrees When the ambient temperature 15 <= T1 < 20 degrees, the water tank automatically adjusts the temperature T2 <= 40 degrees The outlet water temperature is adjustable 5 - 20 degrees higher than the designed water tank temperature Add a return water pump to the water supply pipeline and complete the return water control with the water flow switch of the equipment: When using hot water for the first time, repeat the water supply and 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, the return water pump is turned on after more than 10 - 20 minutes (adjustable).

9. A control method for a dual direct heating constant temperature zero cold water hot water system according to claim 8, characterized in that ； 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 and pressure-bearing constant temperature zero cold water are first powered on to work, and the variable heat source works later, and after heating and rising in temperature, it enters the water tank.

10. A control method for a dual direct heating constant temperature zero cold water hot water system according to claim 8, characterized in that ； 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 and pressure-bearing constant temperature zero cold water are powered off, and it is sent to the variable heat source to work by the pressure of tap water, and after heating and rising in temperature, it flows out through the water flow switch for the user to use.

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