CN116358164A - Water heater system and control method thereof - Google Patents

Abstract

The invention relates to the field of water heaters, in particular to a water heater system and a control method thereof; the water heater system comprises a water inlet pipe, a water heater, a water outlet pipe and a circulating pipe, wherein the water inlet pipe, the water heater, the water outlet pipe, the circulating pipe and the water inlet pipe are sequentially connected to form a zero cold water heating loop; the water heater further includes: the water in the zero cold water heating loop is heated through the water in the heat exchange water storage tank, so that the water heater is prevented from being frequently started, energy is saved, and the service life of the water heater is prolonged. The control method is used for controlling the water heater system.

Description

Water heater system and control method thereof

technical field

The invention relates to the field of water heaters, in particular to a water heater system and a control method thereof.

Background technique

A water heater is a common household appliance that heats water through electric heating or gas combustion to provide hot water for kitchens, bathrooms and other facilities.

The current water heater system usually has a zero-cold water function, that is, when the water heater is not in use, the water in the water heater pipe is circulated in the water heater and heated to keep the water temperature at a certain temperature, so that when the user turns on the water heater, hot water will flow out immediately .

When the above-mentioned water heater system performs zero-cold water heating, when the water temperature in the pipeline of the water heater drops, the heating function of the water heater needs to be activated to heat the water, which causes frequent switching of the water heater, affects the service life of the water heater, and causes waste of resources.

Contents of the invention

The technical problem to be solved by the present invention is to provide a water heater system and its control method in order to overcome the defects of frequent switch on and off of the water heater and waste of energy when the water heater system performs zero-cold water heating in the prior art.

The present invention solves the above technical problems through the following technical solutions:

The first aspect of the present invention provides a water heater system, the water heater system includes a water inlet pipe, a water heater, a water outlet pipe and a circulation pipe, the water inlet pipe, the water heater, the water outlet pipe, the circulation pipe and the The water inlet pipes are connected in sequence to form a zero cold water heating circuit;

The water heater also includes: a first regulating valve, a first temperature sensor, a heat exchange storage tank and a controller; the heat exchange storage tank is used for heating and storing hot water; the heat exchange storage tank has a water inlet and a water outlet , the water inlet and outlet of the heat exchange storage tank are respectively connected to the water inlet pipe, the first temperature sensor is arranged in the heat exchange storage tank, and the first regulating valve is connected to the heat exchange storage tank between the outlet of the water inlet and the inlet pipe;

The controller is electrically connected to the first regulating valve and the first temperature sensor; the controller controls the opening of the first regulating valve when the water heater system performs zero cold water circulation and satisfies T1>Ta; Wherein, T1 is the temperature detected by the first temperature sensor, and Ta is the first set temperature.

In this scheme, the water at the water supply end flows into the water heater through the water inlet pipe, and after being heated by the water heater, it flows out from the water outlet pipe to the water end for users to use; the circulation pipe is connected between the water inlet pipe and the water outlet pipe, so that the water inlet pipe, water heater and circulation pipe are connected. It forms a zero cold water heating circuit. When the water is stopped, the water flow is circulated and heated in the zero cold water heating circuit to ensure that hot water can be produced immediately when water is used. The heat exchange storage tank can heat and store water. When zero-cooled water is heated, the water flow performs zero-cooled water circulation in the zero-cooled water heating circuit; if the temperature T1 detected by the first temperature sensor and the first set temperature Ta satisfy T1>Ta, then At this time, the water temperature in the heat exchange storage tank is higher than the first set temperature, and the water in the zero cold water heating circuit can be heated by the water in the heat exchange storage tank. The controller controls the opening of the first regulating valve, so that the water in the heat exchange storage tank The hot water enters the water inlet pipe and heats the water in the pipe, and the water with a lower temperature in the water inlet pipe is filled into the heat exchange storage tank, so as to realize the heating of water in the zero-cold water heating circuit;

Wherein, the first set temperature Ta can be set by the user according to the actual use requirements, and the zero-cooled water circulation of the water heater system refers to the state in which the water flow circulates in the zero-cooled water heating circuit.

Therefore, after the water heater is temporarily turned off, it is not necessary to turn on the water heater for zero-cold water heating, which saves energy and improves the service life of the water heater.

Preferably, the water heater system further includes a circulating pump, a second temperature sensor and a second regulating valve; the circulating pump is set in the zero cold water heating circuit, the second temperature sensor is set in the water inlet pipe, so The second regulating valve is arranged in the circulation pipe; the controller is electrically connected with the circulation pump, the second temperature sensor and the second regulating valve, and the controller is used to The temperature value detected by the sensor controls the opening or closing of the circulating pump and the second regulating valve.

In this scheme, the circulation pump is installed in the zero-cooled water heating circuit to drive the water flow to circulate in the zero-cooled water heating circuit; the second temperature sensor is installed in the water inlet pipe to detect the water temperature of the water inlet pipe. Since the water inlet pipe is far away from the hot water outlet Therefore, the water temperature in the water inlet pipe can better reflect the minimum water temperature of the zero cold water heating circuit; the controller controls the switch of the circulating pump and the second regulating valve according to the water temperature detected by the second temperature sensor. When the second temperature sensor detects that the water temperature of the water inlet pipe is too low, the controller controls the circulation pump and the second regulating valve to open, so that the water flow performs zero cold water circulation in the zero cold water heating circuit to heat the water in the zero cold water heating circuit; When the second temperature sensor detects that the water temperature in the water inlet pipe is too high, the controller controls the circulating pump and the second regulating valve to close, so as to stop the zero cold water circulation and avoid the high water temperature in the zero cold water heating circuit.

Preferably, when the water heater system stops water output, the controller controls the first regulating valve and the circulating pump to turn on when the temperature value T2 detected by the second temperature sensor satisfies T2<Ta-ΔT1 ; Wherein, ΔT1 is the first set deviation value.

In this scheme, when the temperature value T2 detected by the second temperature sensor is less than Ta-ΔT1, it means that the water temperature of the water inlet pipe is obviously lower than the set temperature at this time, and at this time the controller controls the first regulating valve and the circulation pump to open, Thereby starting the zero cold water circulation of the water heater system, and then heating the water in the zero cold water heating circuit.

Preferably, the controller is electrically connected to the water heater; when the water heater system stops water output, the controller controls the water heater to start heating when T1≤Ta and T2<Ta-ΔT1 are satisfied.

In this solution, the controller is electrically connected to the water heater. When T1 is less than Ta, the water in the heat exchange storage tank cannot heat the water in the zero-cooled water heating circuit to the set temperature. The condition of circulation (T2<Ta-ΔT1), then the controller controls the water heater to turn on to heat the water in the zero cold water circulation loop. Among them, the value of ΔT1 can be designed according to the water volume in the zero-cooled water heating circuit, the efficiency of zero-cooled water heating, and the like. As a result, the effect of zero cold water heating can be guaranteed even when the heat in the heat exchange storage tank is insufficient, and the applicability of the water heater system is improved.

Preferably, the water heater includes a combustion chamber, a heat exchanger and a smoke exhaust pipe, the heat exchanger is arranged on the combustion chamber, and both the water inlet pipe and the water outlet pipe are connected to the heat exchanger; The smoke exhaust pipe communicates with the combustion chamber for exhausting the smoke in the combustion chamber, and the heat exchange storage tank is arranged on the smoke exhaust pipe to exchange heat with the smoke in the smoke exhaust pipe.

In this solution, the water heater is a gas water heater, which heats the water in the heat exchanger through the combustion of gas in the combustion chamber; the high-temperature flue gas generated by the combustion is discharged from the exhaust pipe, and the heat exchange storage tank is installed on the exhaust pipe. It exchanges heat with the flue gas in the exhaust pipe, and heats the water in the heat-exchanging water storage tank through the high-temperature flue gas, which saves energy, reduces costs, and reduces the temperature of the exhausted flue gas, which is beneficial to environmental protection. At the same time, when the user uses hot water, the water in the heat exchange storage tank is heated synchronously, so that the water temperature in the heat exchange storage tank rises to a certain value after the user stops using water, so that it can be used for zero cold water heating immediately, without waiting for the heat exchange storage tank The water in is heated.

Preferably, the controller controls the opening of the first regulating valve when water is discharged from the water heater system and T1≥Tb; wherein, Tb is the second set temperature, and Tb>Ta.

In this scheme, when the water heater system discharges water, the water heater is turned on for heating to meet the water heat load. At this time, if the water temperature in the heat exchange storage tank satisfies T1≥Tb, the temperature of the heat exchange storage tank is relatively high. At this time, the controller controls the opening of the first regulating valve, and the hot water in the heat exchange storage tank and the cold water in the water inlet pipe Mixing, the temperature of the water inlet pipe is increased, thereby reducing the heat load of the water heater, and at the same time improving the efficiency of hot water, achieving the effect of energy saving and emission reduction.

Preferably, when the water heater system outputs water and the first regulating valve is opened, the controller controls the opening of the first regulating valve to increase when T1>Tc is satisfied, and the controller controls the opening of the first regulating valve to increase when T1>Tc is satisfied. When ≤Tc, the opening degree of the first regulating valve is controlled to decrease; wherein Tc is the third set temperature, and Tb>Tc>Ta.

In this solution, when the water heater system is out of water and the first regulating valve is opened, the opening of the first regulating valve is controlled to increase when T1>Tc, so as to increase the amount of water that the heat exchange storage tank fills into the water inlet pipe, thereby increasing the water inlet pipe. Inlet water temperature; when T1≤Tc is satisfied, in order to ensure that there is enough hot water in the heat exchange storage tank for zero-cold water heating, the controller controls the opening of the first regulating valve to decrease to reduce the temperature in the heat exchange storage tank. Outflow of hot water. Tb>Tc>Ta, while ensuring that the water temperature of the heat exchange storage tank is greater than Ta for zero cold water heating, there is a certain difference between Tc and Tb, so that the heat exchange storage tank can continuously replenish a certain amount of hot water for the water inlet pipe , to avoid the situation that the first regulating valve is closed immediately after opening, which is conducive to the stable operation of the water heater system.

Preferably, when the water heater system outputs water, the controller controls the opening of the first regulating valve to remain constant when any one of T2>Td and T3>Ta is satisfied; wherein, T2 is the first The temperature value detected by the second temperature sensor, Td is the fourth set temperature, and Td<Ta, T3 is the water outlet temperature of the water outlet pipe.

In this scheme, when the water heater system discharges water, if T2>Td is satisfied, it means that the temperature of the water inlet pipe is relatively high, and the user’s minimum temperature may be set to be very low. If the water inlet temperature is too high, it will not be heated. The increase causes the water heater to stop heating due to the high temperature of the inlet water. At this time, stop changing the opening of the first regulating valve and keep the water output of the heat exchange storage tank unchanged; when T3>Ta, the water outlet temperature of the water heater system has reached Set the temperature. At this time, you can stop changing the opening degree of the first regulating valve, keep the water output of the heat exchange storage tank unchanged, and avoid the further increase of the inlet water temperature and further increase of the outlet water temperature. Wherein, the value of the fourth set temperature Td can be set according to the set temperature of the user, and Td<Ta, so as to ensure that the inlet water temperature will not exceed the set temperature.

The second aspect of the present invention provides a water heater system control method, the control method is applied to the above water heater system, the water heater system also includes a circulation pump, a second temperature sensor and a second regulating valve, the The circulation pump is arranged in the zero cold water heating circuit, the second temperature sensor is arranged in the water inlet pipe, and the second regulating valve is arranged in the circulation pipe; the control method includes the following steps:

S1. Judging whether the water heater system stops water output, if so, execute step S2;

S2. Control the circulating pump and the second regulating valve to open;

S3. Comparing the temperature T1 detected by the first temperature sensor with the first set temperature Ta, if T1>Ta, controlling the opening of the first regulating valve;

S4. Comparing the temperature T2 detected by the second temperature sensor with the first set temperature Ta, if T2≥Ta+ΔT2, control the circulating pump, the first regulating valve and the second regulating valve to close , where ΔT2 is the second set deviation value.

In this solution, when the water heater stops outputting water, the circulating pump and the second regulating valve are controlled to open for zero cold water circulation. At this time, if T1>Ta, the water in the heat exchange storage tank can be used to heat the water in the water inlet pipe, and the first regulating valve is controlled to open to replenish the hot water in the heat exchange water storage tank into the water inlet pipe, so as to increase zero-cold water heating The temperature of the water in the circuit. Therefore, there is no need to frequently turn on the water heater for heating, and the hot water stored in the heat exchange storage tank is used for heating to realize the zero-cold water heating function, which improves the service life of the water heater system and achieves the purpose of energy saving and emission reduction.

As the water temperature in the zero-cooled water heating circuit rises, when the temperature T2 detected by the second temperature sensor satisfies T2≥Ta+ΔT2, that is, when the water temperature of the water inlet pipe is higher than the set temperature by at least ΔT2, it indicates that the zero-cooled water heating circuit The water temperature in the tank reaches the set temperature and can be used by users. The value of the second set temperature ΔT2 can be set according to the actual situation. By setting ΔT2, the water temperature in the zero-cooled water heating circuit can be maintained for a period of time to reach the set temperature, and will not drop rapidly to the set temperature after the zero-cooled water heating is turned off. The zero cold water heating function is frequently turned on and off when the temperature is below a certain temperature, which improves the user experience.

Preferably, step S1 includes the following steps:

S11. Judging whether the water heater system stops water output, if so, execute step S2, otherwise execute step S12;

S12. If T1≥Tb, control the opening of the first regulating valve, and control the opening of the first regulating valve to increase, wherein Tb is the second set temperature;

S13. If any one of T2>Td and T3>Ta is satisfied, control the opening of the first regulating valve to remain unchanged, where Td is the fourth set temperature, and Td<Ta, T3 is the outlet pipe of the outlet water temperature.

In this solution, when the water heater system does not stop water output, that is, when the user is using hot water, the heating function of the water heater is turned on to meet the user's hot water demand. At this time, if T1≥Tb, it means that the temperature of the water in the heat exchange storage tank is obviously high, and the first regulating valve is controlled to open so that the hot water in the heat exchange storage tank is filled into the water inlet pipe, and the water inlet temperature of the water inlet pipe is increased, thereby Reduce the heat load when the water heater is heated, improve the heating efficiency and save energy.

When the water outlet of the water heater system satisfies T2>Td, it means that the temperature of the water inlet pipe is relatively high; since the user’s minimum temperature may be set very low, the water heater will not ignite and heat when the water inlet temperature is too high, in order to avoid the temperature of the water inlet pipe from continuing to increase As a result, the water heater stops heating because the water temperature of the water inlet pipe is too high. At this time, stop changing the opening of the first regulating valve, and keep the water output of the heat exchange storage tank unchanged so that the water temperature of the water inlet pipe does not rise any longer; when T3>Ta When the water outlet temperature of the water heater system has reached the set temperature, the opening of the first regulating valve can be stopped at this time, and the water outlet volume of the heat exchange storage tank can be kept constant, so as to avoid the further increase of the inlet water temperature and the resulting water outlet of the water heater system. The temperature rises further.

Through the above control, the water heater system is more stable when heating, and the user experience is better.

Preferably, the first regulating valve is a stepless regulating valve, and in step S13, the opening of the first regulating valve is gradually increased for stepless regulation.

In this solution, the first regulating valve is a stepless regulating valve, so that stepless regulation can be performed by gradually increasing the opening of the first regulating valve, so as to facilitate The water output of the heat exchange storage tank is gradually adjusted, thereby facilitating the control of the water temperature of the heat exchange storage tank and the water temperature of the water inlet pipe, making the adjustment more accurate and the controllability of the water heater system better.

Preferably, the step S1 also includes the following steps:

S14. If T1≤Tc, execute step S15, wherein Tc is the third set temperature and Tb>Tc>Ta;

S15. Control the opening of the second regulating valve to gradually decrease.

In this solution, when T1>Tc, the opening of the first regulating valve is controlled to increase to increase the amount of water supplied to the water inlet pipe by the heat exchange storage tank, thereby increasing the water inlet temperature of the water inlet pipe. At the same time, avoid too high water temperature in the heat exchange storage tank, which will cause excessive heat exchange between the heat exchange storage tank and the outside world and cause excessive energy loss; when T1≤Tc is satisfied, in order to ensure that the hot water in the heat exchange storage tank has enough The heat is heated by zero cold water, and at this time, the controller controls the opening of the first regulating valve to decrease, so as to reduce the outflow of hot water in the heat exchange storage tank. Tb>Tc>Ta, while ensuring that the water temperature of the heat exchange storage tank is greater than Ta for zero cold water heating, there is a certain difference between Tc and Tb, so that the heat exchange storage tank can continuously replenish a certain amount of hot water for the water inlet pipe , to avoid the situation that the first regulating valve is closed immediately after opening, which is conducive to the stable operation of the water heater system.

Preferably, step S3 includes the following steps:

S31. If T1>Ta, control the first regulating valve to open, otherwise execute step S32;

S32. Control the water heater to start heating.

In this scheme, when T1≤Ta, the water in the heat exchange storage tank cannot heat the water in the zero cold water heating circuit to the set temperature. At this time, the water heater is controlled to turn on the heating, so that the heat of the water in the heat exchange storage tank is insufficient It can also carry out zero cold water heating at the same time, which improves the applicability.

Preferably, the control method also includes the following steps:

S5. Comparing the temperature value T1 detected by the first temperature sensor with the first set temperature Ta, if T1<Ta-ΔT1 is satisfied, return to step S2, where ΔT1 is the first set deviation value.

In this scheme, when the water in the zero-cooled water heating circuit is heated to the set temperature, if the user does not use hot water, the temperature of the water in the zero-cooled water heating circuit will drop after a period of time. If T1<Ta-ΔT1 is satisfied, Then it shows that the water temperature in the zero cold water heating circuit is obviously lower than the first set temperature. At this time, repeat the aforementioned zero cold water heating steps to ensure that the water temperature in the zero cold water heating circuit reaches the set temperature.

The positive progress effect of the present invention is:

In the water heater system of the present invention, by setting the heat exchange storage tank and the first regulating valve, when the water heater system performs zero cold water circulation, the hot water in the heat exchange storage tank is injected into the zero cold water heating circuit to realize zero cold water heating, thus eliminating the need for frequent Turn on the water heater for zero-cold water heating, which improves the service life of the water heater; the heat exchange storage tank is installed in the exhaust pipe, and by absorbing the heat of the flue gas, waste heat recovery is realized to achieve the purpose of energy saving and emission reduction; at the same time, the heat exchange storage tank Hot water can be injected into the water inlet pipe when the water heater starts to heat, so as to increase the temperature of the water inlet, reduce the heat load of the water heater, and improve the heating efficiency.

Description of drawings

Fig. 1 is a schematic structural diagram of a water heater system according to an embodiment of the present invention.

Fig. 2 is a control flow chart of the first zero cold water heating of the water heater system according to an embodiment of the present invention.

Fig. 3 is a control flow chart when the heat exchange storage tank is replenishing water for the water heater system according to an embodiment of the present invention.

Fig. 4 is a control flow chart of the water heater system in an embodiment of the present invention when heating with zero cold water again.

Explanation of reference signs:

Water heater system 100

Inlet pipe 101

Water heater 102

Gas inlet pipe 121

Proportional valve 122

combustion chamber 123

heat exchanger 124

Exhaust pipe 125

Fan 126

Outlet pipe 103

Circulation pipe 104

The first regulating valve 110

first temperature sensor 120

Heat exchange storage tank 130

Cold water inlet pipe 131

Hot water outlet pipe 132

Circulation pump 140

Second regulating valve 150

Second temperature sensor 160

flow sensor 170

Water supply end 200

Water terminal 300

Detailed ways

The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.

This embodiment discloses a water heater system 100. Referring to FIG. Water tank 130, circulation pump 140, second regulating valve 150, second temperature sensor 160 and controller. The water inlet pipe 101, the water heater 102, the water outlet pipe 103, the circulation pipe 104 and the water inlet pipe 101 are sequentially connected to form a zero cold water heating circuit. The second regulating valve 150 is disposed on the circulation pipe 104 and is used to control the opening and closing of the zero cold water heating circuit. The circulation pump 140 is arranged in the zero cold water heating circuit, and is used to drive water to circulate in the zero cold water heating circuit. The second temperature sensor 160 is disposed on the water inlet pipe 101 for detecting the water temperature in the water inlet pipe 101 .

Specifically, in this embodiment, the circulation pump 140 is disposed on the circulation pipe 104 . In addition, in other embodiments, the circulation pump 140 can also be arranged in other positions of the zero cold water heating circuit.

The heat exchange storage tank 130 is used for heating and storing hot water. Wherein, the heat exchange storage tank 130 has a water inlet and a water outlet, both of which are connected to the inner cavity of the heat exchange storage tank 130 . The water inlet and water outlet of the heat exchange storage tank 130 are respectively connected with the water inlet pipe 101 .

In this embodiment, the heat exchange storage tank 130 is provided with a cold water inlet pipe 131 and a hot water outlet pipe 132, the cold water inlet pipe 131 is connected between the water inlet of the heat exchange storage tank 130 and the water inlet pipe 101, and the hot water outlet pipe 132 It is connected between the water outlet of the heat exchange storage tank 130 and the water inlet pipe 101 . Along the water flow direction of the water inlet pipe 101, the connection point between the cold water inlet pipe 131 and the water inlet pipe 101 is located upstream of the connection point between the hot water outlet pipe 132 and the water inlet pipe 101, so that water with a lower temperature can flow from the cold water inlet pipe 131 Entering the heat exchange water storage tank 130, the hot water in the heat exchange water storage tank 130 can flow into the water inlet pipe 101 from the hot water outlet pipe 132, and it is difficult for the water in the water inlet pipe 101 to mix with the water in the hot water outlet pipe 132 to rise in temperature The condition that the cold water inlet pipe 131 enters the heat exchange storage tank 130 is conducive to improving the heating efficiency of the hot water in the heat exchange storage tank 130 to the water in the zero cold water heating circuit.

The first temperature sensor 120 is disposed in the heat exchange storage tank 130 for detecting the temperature of the water in the heat exchange storage tank 130 . The first regulating valve 110 is connected between the water outlet of the heat exchange storage tank 130 and the water inlet pipe 101 . In this embodiment, the first regulating valve 110 is disposed on the hot water outlet pipe 132 for controlling opening and closing of the hot water outlet pipe 132 .

The controller is electrically connected to the first regulating valve 110 , the first temperature sensor 120 , the second regulating valve 150 , the second temperature sensor 160 , the circulation pump 140 and the water heater 102 . The controller controls the opening and closing of the first regulating valve 110 according to the value detected by the first temperature sensor 120 , and controls the opening and closing of the second regulating valve 150 and the circulation pump 140 according to the value detected by the second temperature sensor 160 .

Specifically, the controller controls the first regulating valve 110 to open when the water heater system 100 performs zero cold water circulation and satisfies T1>Ta; wherein, T1 is the temperature detected by the first temperature sensor 120, Ta is the first set temperature, and the second A set temperature Ta can be set by the user according to actual usage requirements.

When a user uses hot water, the water from the water supply end 200 flows into the water heater 102 through the water inlet pipe 101 , and after being heated by the water heater 102 , flows out from the water outlet pipe 103 to the water end 300 for use by the user. When the user stops using water, the water flow can be circulated and heated in the zero-cooled water heating circuit to ensure that hot water can be produced immediately when using water.

In this embodiment, when zero cold water heating is performed, the water heater system 100 performs zero cold water circulation, that is, the water flow circulates in the zero cold water heating circuit. If the temperature T1 detected by the first temperature sensor 120 satisfies T1>Ta, then the water temperature in the heat exchange water storage tank 130 is higher than the first set temperature Ta at this time, and the water in the heat exchange water storage tank 130 can flow into the water at this time. The water in the zero cold water heating circuit is heated in the water pipe 101 . The controller controls the first regulating valve 110 to open, so that the hot water in the heat exchange storage tank 130 enters the water inlet pipe 101 from the hot water outlet pipe 132 and heats the water in the zero cold water heating circuit, and the temperature in the zero cold water heating circuit is relatively low The water flows into the heat exchange storage tank 130 from the cold water inlet pipe 131 to keep the water pressure constant.

Thus, after the water heater 102 is turned off, it is not necessary to turn on the water heater 102 for zero-cold water heating, which saves energy and improves the service life of the water heater 102 .

The controller controls the opening and closing of the circulating pump 140 and the second regulating valve 150 according to the water temperature detected by the second temperature sensor 160 . When the user stops using water for a period of time, if the second temperature sensor 160 detects that the water temperature in the water inlet pipe 101 is too low, the controller controls the circulation pump 140 and the second regulating valve 150 to open, so that the water flow is zero-cooled in the zero-cooled water heating circuit. Circulate in order to heat the water in the zero cold water heating loop. When the second temperature sensor 160 detects that the water temperature in the water inlet pipe 101 is too high, the controller controls the circulation pump 140 and the second regulating valve 150 to close, so as to stop the zero cold water circulation and avoid the high water temperature in the zero cold water heating circuit.

Since the water inlet pipe 101 is far away from the hot water outlet pipe 103, the water temperature in the water inlet pipe 101 can better reflect the minimum water temperature of the zero cold water heating circuit, so the second temperature sensor 160 is installed on the water inlet pipe 101, so as to ensure that the zero cold water heating is The minimum temperature of the zero cold water heating circuit is determined, so that the water in the zero cold water heating circuit can be heated to the set temperature.

Specifically, when the user stops using water, the water heater system 100 stops dispensing water. When the temperature value T2 detected by the second temperature sensor 160 is less than Ta-ΔT1, it means that the water temperature of the water inlet pipe 101 is obviously lower than the set temperature at this time. At this time, the controller controls the first regulating valve 110 and the circulating pump 140 to open, thereby Turn on the zero cold water circulation of the water heater system 100, and then heat the water in the zero cold water heating circuit. Wherein, ΔT1 is the first set deviation value, and its value can be set according to the actual situation. In this embodiment, ΔT1 is specifically 3°C.

In this embodiment, when the user stops using water, the controller controls the water heater 102 to start heating when T1≤Ta and T2<Ta-ΔT1 are satisfied. When T1 is less than Ta, it means that the water in the heat exchange storage tank 130 cannot heat the water in the zero-cooled water heating circuit to the set temperature Ta. At this time, if the condition for starting the zero-cooled water cycle of the water heater system 100 is met (T2<Ta- ΔT1), the controller controls the water heater 102 to turn on to heat the water in the zero cold water circulation loop. Among them, the value of ΔT1 can be designed according to the water volume in the zero-cooled water heating circuit, the efficiency of zero-cooled water heating, and the like. Therefore, even when the heat of the water in the heat exchange storage tank 130 is insufficient, the effect of zero cold water heating can be guaranteed, and the applicability of the water heater system 100 is improved.

In this embodiment, the water heater 102 is a gas water heater 102 , which includes a gas inlet pipe 121 , a proportional valve 122 , a combustion chamber 123 , a heat exchanger 124 , a smoke exhaust pipe 125 and a fan 126 . The gas inlet pipe 121 is connected between an external gas source and a proportional valve 122 , and the proportional valve 122 controls the amount of gas that the gas inlet pipe 121 enters into the burner of the combustion chamber 123 to control the heating power of the water heater 102 . The heat exchanger 124 is arranged on the combustion chamber 123 , and the gas burns in the combustion chamber 123 to release heat to heat the water in the heat exchanger 124 . Both the water inlet pipe 101 and the water outlet pipe 103 are connected to the heat exchanger 124 . The smoke exhaust pipe 125 communicates with the combustion chamber 123, and the wind is arranged in the smoke exhaust pipe 125 to drive the smoke in the smoke exhaust pipe 125 to be discharged. The heat exchange storage tank 130 is disposed on the exhaust pipe 125 to exchange heat with the flue gas in the exhaust pipe 125 .

Wherein, the heat exchange water storage tank 130 can be arranged in the exhaust pipe 125 to directly exchange heat with the flue gas. The heat exchange water storage tank 130 can also be arranged outside the smoke exhaust pipe 125 to dissipate heat through the wall of the smoke exhaust pipe 125 and the flue gas. In this embodiment, the heat exchange storage tank 130 is arranged outside the smoke exhaust pipe 125, so that the volume of the heat exchange storage tank 130 is not limited by the smoke exhaust pipe 125, which facilitates the arrangement of the heat exchange storage tank 130 and reduces the flue gas exchange. The pollution of the heat storage tank 130 is beneficial to keep the heat exchange storage tank 130 hygienic.

Thus, the water in the heat exchange water storage tank 130 is heated by the high-temperature flue gas, which saves energy, reduces costs, and lowers the temperature of the exhausted flue gas, which is beneficial to environmental protection. At the same time, when the user uses hot water, the water in the heat exchange storage tank 130 is heated synchronously, so that the water temperature in the heat exchange storage tank 130 rises to a certain value after the user stops using water, so that it can be immediately used for zero cold water heating without waiting for heat exchange. The water in the water storage tank 130 is heated.

In addition, in other embodiments, the heat exchange storage tank 130 may also have a built-in heater, and the water in the tank may be heated by the heater generating heat.

When the user uses hot water, the water heater system 100 outputs water, and the water heater 102 is turned on for heating to meet the water heat load. At this time, if the temperature of the water in the heat exchange storage tank 130 satisfies T1≥Tb, it means that the temperature of the heat exchange storage tank 130 is relatively high. The cold water in the water inlet pipe 101 is mixed to increase the temperature of the water inlet pipe 101, thereby reducing the heat load of the water heater 102, and at the same time improving the efficiency of hot water to achieve the effect of energy saving and emission reduction. At the same time, when the temperature of the heat exchange water storage tank 130 is high, the hot water in the heat exchange water storage tank 130 is filled in, and the cold water in the water inlet pipe 101 is filled into the heat exchange water storage tank 130, so as to avoid the excessive temperature in the heat exchange water storage tank 130 from causing The ability of the heat exchange storage tank 130 to absorb the heat of the flue gas is reduced.

Wherein, Tb is the second set temperature, and Tb>Ta; the value of Tb can be designed according to the actual situation, and in this embodiment, Tb is 90°C.

When water comes out of the water heater system 100 and the first regulating valve 110 is opened, the controller controls the opening of the first regulating valve 110 to increase when T1>Tc is satisfied, so as to increase the amount of water replenished into the water inlet pipe 101 by the heat exchange storage tank 130, thereby Increase the water inlet temperature of the water inlet pipe 101. When T1≤Tc is satisfied, the controller controls the opening of the first regulating valve 110 to decrease to ensure that the heat exchange storage tank 130 has enough hot water for zero cold water heating, so as to reduce the outflow of hot water in the heat exchange storage tank 130 quantity.

Wherein, Tc is the third set temperature, its value can be set according to the actual situation, and Tb>Tc>Ta. While ensuring that the water temperature of the heat exchange storage tank 130 is greater than Ta for zero cold water heating, there is a certain difference between Tc and Tb, so that the heat exchange storage tank 130 can continuously replenish a certain amount of hot water for the water inlet pipe 101, avoiding The situation that the first regulating valve 110 is closed immediately after opening is beneficial to the stable operation of the water heater system 100 .

In addition, when water is discharged from the water heater system 100, the controller controls the opening of the first regulating valve 110 to remain constant when any one of T2>Td and T3>Ta is satisfied. When T2>Td is satisfied, it means that the temperature of the water inlet pipe 101 is relatively high, the minimum temperature set by the user may be very low, and the water heater may not be ignited and heated if the water inlet temperature is too high. In order to prevent the temperature of the water inlet pipe 101 from continuing to increase and cause the water heater 102 to stop heating due to too high water temperature, stop changing the opening of the first regulating valve 110 and keep the water output of the heat exchange storage tank 130 unchanged. When T3>Ta, the outlet water temperature of the water heater system 100 has reached the set temperature, and at this time, the opening degree of the first regulating valve 110 can be stopped to keep the outlet water volume of the heat exchange storage tank 130 unchanged, so as to avoid further rise of the inlet water temperature. This leads to a further increase in the outlet water temperature.

Wherein, T2 is the temperature value detected by the second temperature sensor 160 , Td is the fourth set temperature, and Td<Ta, and T3 is the outlet water temperature of the outlet pipe 103 . The value of the fourth set temperature Td can be set according to the set temperature of the user, and Td<Ta, so as to ensure that the inlet water temperature will not exceed the set temperature.

In this embodiment, the first regulating valve 110 is a stepless regulating valve, so that when the opening of the first regulating valve 110 is adjusted, the effect of the opening of the first regulating valve 110 on the output of the heat exchange storage tank 130 can be slowly increased or decreased. The water volume is steplessly adjusted so as to improve the control accuracy and the controllability of the water heater system 100 .

In this embodiment, the water heater system 100 further includes a flow sensor 170 . The flow sensor 170 is arranged between the water end 300 and the water outlet pipe 103 and is electrically connected to the controller. The controller judges whether the water heater system 100 stops water outlet according to the value detected by the flow sensor 170 .

Referring to FIG. 2 to FIG. 4 , this embodiment also discloses a control method of the water heater system 100 , which is applied to the above water heater system 100 . The control method comprises the steps of:

S1. Judging whether the water heater system 100 stops water outlet, if yes, execute step S2.

Step S1 comprises the following steps:

S11. Determine whether the water heater system 100 has stopped water outlet according to the value detected by the flow sensor 170. If the flow sensor 170 detects that the value of the water flow from the water outlet pipe 103 to the water end 300 is zero, the user stops using water, and the water heater system 100 stops water outlet , go to step S2; otherwise, the user is using hot water and the water heater system 100 is producing water, go to step S12.

S12. Control the opening and closing of the first regulating valve 110 according to the temperature value detected by the first temperature sensor 120 .

Step S12 comprises the following steps:

S121, compare T1 and Tb, if T1≥Tb, execute step S122;

S122, the controller controls the first regulating valve 110 to open, the heat exchange storage tank 130 replenishes water for the water heater 102, and executes step S123;

S123. Gradually increase the opening degree of the first regulating valve 110 .

Wherein, T1 is the temperature value detected by the first temperature sensor 120, that is, the water temperature value in the heat exchange storage tank 130; Tb is the second set temperature, and its value can be set according to the actual situation.

At this time, the heating function of the water heater 102 is turned on to meet the hot water demand of the user. If T1≥Tb, it means that the temperature of the water in the heat exchange water storage tank 130 is obviously higher, and the first regulating valve 110 is controlled to open so that the hot water in the heat exchange water storage tank 130 is filled into the water inlet pipe 101, and the water inlet of the water inlet pipe 101 is increased. temperature, thereby reducing the thermal load of the water heater 102 during heating, improving heating efficiency, and saving energy. At the same time, in this embodiment, the water in the heat exchange storage tank 130 is heated by the high temperature flue gas, and the heat exchange storage tank 130 exchanges heat with the flue gas to reduce the temperature of the discharged flue gas, which is beneficial to environmental protection. When T1≥Tb, the hot water in the heat exchange storage tank 130 is added to the water inlet pipe 101 to prevent the water temperature in the heat exchange storage tank 130 from being too high, which is conducive to the heat exchange between the heat exchange storage tank 130 and the flue gas, and at the same time avoids The temperature of the water in the heat exchange storage tank 130 is too high, resulting in excessive heat exchange between the heat exchange storage tank 130 and the outside, resulting in excessive energy loss.

S13 , judging whether to stop increasing the opening degree of the first regulating valve 110 according to the water inlet temperature of the water inlet pipe 101 and the water outlet temperature of the water outlet pipe 103 detected by the second temperature sensor 160 .

Step S13 comprises the following steps:

S131. If any one of T2>Td and T3>Ta is satisfied, execute step S132;

S132. The controller controls the opening of the first regulating valve 110 to remain unchanged.

Wherein, Td<Ta, Td is the fourth set temperature, T2 is the water inlet temperature of the water inlet pipe 101 detected by the second temperature sensor 160, and T3 is the water outlet temperature of the water outlet pipe 103. A temperature sensor detects. In this embodiment, the value of Td is specifically 30°C.

When T2>Td is satisfied, it means that the temperature of the water inlet pipe 101 is relatively high; since the user’s minimum temperature may be set very low, the water heater 102 will not ignite and heat when the water inlet temperature is too high. 102 Stop heating because the water temperature of the water inlet pipe 101 is too high, stop changing the opening of the first regulating valve 110 at this time, keep the water output of the heat exchange storage tank 130 unchanged so that the water temperature of the water inlet pipe 101 no longer rises.

When T3>Ta, the outlet water temperature of the water heater system 100 has reached the set temperature, and at this time, the opening degree of the first regulating valve 110 can be stopped to keep the outlet water volume of the heat exchange storage tank 130 unchanged, so as to avoid further rise of the inlet water temperature. The temperature of the outlet water of the water heater system 100 further increases.

Therefore, when any one of T2>Td and T3>Ta is satisfied, it means that the heating capacity of the water heater system 100 is sufficient, and there is no need to increase the water output of the heat exchange storage tank 130 at this time. Through the above control, the water heater system 100 is more stable when heating, and the user experience is better

S14. Comparing T1 and Tc, if T1≤Tc, then execute step S15; wherein, Tc is the third set temperature, and its value can be set according to requirements. In this embodiment, Tc is specifically 80°C;

S15. The controller controls the opening of the first regulating valve 110 to gradually decrease, and adjusts the flow of water flowing into the water inlet pipe 101 from the heat exchange storage tank 130; wherein, Tb>Tc>Ta; Ta is the first set temperature, Its value can be set according to user usage.

When T1>Tc, the heat exchange storage tank 130 has enough heat for the cold water to be heated, and the excess heat can be used to heat the water in the water inlet pipe 101 . By controlling the opening degree of the first regulating valve 110 to increase, the amount of water replenished into the water inlet pipe 101 by the heat exchange storage tank 130 is increased, thereby further increasing the inlet water temperature of the water inlet pipe 101 .

When T1≤Tc is satisfied, in order to ensure that the hot water in the heat exchange storage tank 130 has enough heat (that is, the temperature of the water in the heat exchange storage tank 130 is kept above Tc), zero cold water heating is performed. At this time, the controller controls the first regulating valve 110 The opening degree of is reduced to reduce the outflow of hot water in the heat exchange storage tank 130 . Since Tb>Tc>Ta, while ensuring that the water temperature of the heat exchange storage tank 130 is greater than Ta for zero cold water heating, there is a certain difference between Tc and Tb, so that the heat exchange storage tank 130 can continuously replenish the water inlet pipe 101 A certain amount of hot water avoids the situation that the first regulating valve 110 is closed immediately after opening, which is beneficial to the stable operation of the water heater system 100 .

Wherein, when adjusting the first regulating valve 110, slowly increase the opening degree of the first regulating valve 110 or slowly decrease the opening degree of the first regulating valve 110, so that the water output of the heat exchange storage tank 130 is continuously adjusted, so as to facilitate According to the heating of the water in the water inlet pipe 101 and the water temperature in the heat exchange water storage tank 130, the water output of the heat exchange water storage tank 130 is gradually adjusted, which is convenient for controlling the water temperature of the heat exchange water storage tank 130 and the water temperature of the water inlet pipe 101, so that the adjustment The more precise, the better the controllability of the water heater system 100 .

S2. Control the circulation pump 140 and the second regulating valve 150 to open.

After the user stops using water, the circulation pump 140 and the second regulating valve 150 are controlled to be turned on to perform zero-cooled water circulation, so as to perform zero-cooled water heating for the first time. The zero cold water circulation here means that the water flow circulates in the zero cold water heating circuit, and the zero cold water heating means heating the water in the zero cold water heating circuit so that the water temperature reaches the first set temperature.

S3. Comparing the temperature T1 detected by the first temperature sensor 120 with the first set temperature Ta, if T1>Ta, then controlling the first regulating valve 110 to open;

Step S3 comprises the following steps:

S31. According to the temperature T1 detected by the first temperature sensor 120, it is judged whether to use the heat exchange storage tank 130 for zero cold water heating;

Step S31 comprises the following steps:

S311, compare T1 and Ta, if T1>Ta, execute step S312, otherwise execute step S32;

S312. Control the first regulating valve 110 to open and execute step S4.

When T1>Ta, the water in the heat exchange storage tank 130 can be used to heat the water in the water inlet pipe 101, and the first regulating valve 110 is controlled to open to replenish the hot water in the heat exchange water storage tank 130 into the water inlet pipe 101, and the lift Zero the temperature of the water in the cold water heating circuit. Therefore, there is no need to frequently turn on the water heater 102 for heating, and the hot water stored in the heat exchange storage tank 130 is used for heating to realize the zero-cold water heating function, which improves the service life of the water heater system 100 and achieves the purpose of energy saving and emission reduction.

S32, control the water heater 102 to turn on heating, and execute step S4;

When T1≤Ta, the water in the heat exchange storage tank 130 cannot heat the water in the zero cold water heating circuit to the set temperature. At this time, the water heater 102 is controlled to turn on the heating, so that when the heat of the water in the heat exchange storage tank 130 is insufficient Zero cold water heating can also be performed, which improves the applicability of the water heater system 100 .

S4. According to the temperature T2 detected by the second temperature sensor 160, it is judged whether to turn off zero cold water heating.

Step S4 comprises the following steps:

S41. Comparing the temperature T2 detected by the second temperature sensor 160 with the first set temperature Ta, if T2≥Ta+ΔT2, then execute step S42; wherein, ΔT2 is the second set deviation value, and its value can be determined according to the actual situation To set, in this embodiment, ΔT2 is 3°C;

S42, the controller controls the circulation pump 140, the first regulating valve 110, the second regulating valve 150 and the water heater 102 to close.

As the temperature of the water in the zero-cooled water heating circuit rises, when the temperature T2 detected by the second temperature sensor 160 satisfies T2≥Ta+ΔT2, that is, when the water temperature of the water inlet pipe 101 is higher than the set temperature by at least ΔT2, it means zero-cooled water The water temperature in the heating circuit reaches the set temperature and can be used by users. The value of the second set temperature ΔT2 can be set according to the actual situation. By setting ΔT2, the water temperature in the zero-cooled water heating circuit can be maintained for a period of time to reach the set temperature, and will not drop rapidly to the set temperature after the zero-cooled water heating is turned off. The zero cold water heating function is frequently turned on and off when the temperature is below a certain temperature, which improves the user experience.

S5. Compare the temperature value T1 detected by the first temperature sensor 120 with the first set temperature Ta. If T1<Ta-ΔT1 is satisfied, return to step S2, where ΔT1 is the first set deviation value.

When the water in the zero-cooled water heating circuit is heated to the set temperature, if the user does not use hot water, the temperature of the water in the zero-cooled water heating circuit will drop after a period of time. If T1<Ta-ΔT1 is satisfied, it means zero-cooled water heating The water temperature in the circuit is obviously lower than the first set temperature. At this time, repeat the aforementioned zero-cold water heating step to perform zero-cold water heating again to ensure that the water temperature in the zero-cold water heating circuit reaches the set temperature.

Although the specific implementation of the present invention has been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims (14)

1. A water heater system, the water heater system includes a water inlet pipe, a water heater, an outlet pipe and a circulation pipe, and the water inlet pipe, the water heater, the water outlet pipe, the circulation pipe and the water inlet pipe are connected in sequence to form zero Cold water heating circuit; It is characterized in that the water heater also includes: a first regulating valve, a first temperature sensor, a heat exchange storage tank and a controller; the heat exchange storage tank is used for heating and storing hot water; the heat exchange storage tank has further The water inlet and the water outlet, the water inlet and the water outlet of the heat exchange storage tank are respectively connected with the water inlet pipe, the first temperature sensor is set in the heat exchange storage tank, and the first regulating valve is connected to the Between the water outlet of the heat exchange storage tank and the water inlet pipe; The controller is electrically connected to the first regulating valve and the first temperature sensor; the controller controls the opening of the first regulating valve when the water heater system performs zero cold water circulation and satisfies T1>Ta; Wherein, T1 is the temperature detected by the first temperature sensor, and Ta is the first set temperature. 2. The water heater system according to claim 1, characterized in that, the water heater system further comprises a circulation pump, a second temperature sensor and a second regulating valve; the circulation pump is arranged in the zero cold water heating circuit, the The second temperature sensor is arranged on the water inlet pipe, and the second regulating valve is arranged on the circulation pipe; the controller is electrically connected to the circulation pump, the second temperature sensor and the second regulating valve , the controller is used to control the circulation pump and the second regulating valve to be turned on or off according to the temperature value detected by the second temperature sensor. 3. The water heater system according to claim 2, wherein when the water heater system stops water output, the controller controls when the temperature value T2 detected by the second temperature sensor satisfies T2<Ta-ΔT1 The second regulating valve and the circulation pump are turned on; wherein, ΔT1 is a first set deviation value. 4. The water heater system according to claim 3, wherein the controller is electrically connected to the water heater; when the water heater system stops flowing water, the controller satisfies T1≤Ta and T2<Ta- At ΔT1, the water heater is controlled to start heating. 5. The water heater system according to claim 1, wherein the water heater comprises a combustion chamber, a heat exchanger and a smoke exhaust pipe, the heat exchanger is arranged on the combustion chamber, the water inlet pipe and the The water outlet pipes are all connected to the heat exchanger; the exhaust pipe communicates with the combustion chamber for exhausting the smoke in the combustion chamber, and the heat exchange storage tank is arranged on the exhaust pipe to communicate with the combustion chamber. Flue gas heat exchange in the exhaust pipe. 6. The water heater system according to claim 2, wherein the controller controls the opening of the first regulating valve when the water heater system discharges water and satisfies T1≥Tb; wherein, Tb is the second set temperature , and Tb>Ta. 7. The water heater system according to claim 6, characterized in that, when the water heater system outputs water and the first regulating valve is opened, the controller controls the first regulating valve when T1>Tc is satisfied. The opening degree increases, and the controller controls the opening degree of the first regulating valve to decrease when T1≤Tc is satisfied; wherein Tc is the third set temperature, and Tb>Tc>Ta. 8. The water heater system according to claim 6, characterized in that, when the water heater system outputs water, the controller controls the opening of the first regulating valve when any one of T2>Td and T3>Ta is satisfied. temperature remains unchanged; wherein, T2 is the temperature value detected by the second temperature sensor, Td is the fourth set temperature, and Td<Ta, and T3 is the outlet water temperature of the outlet pipe. 9. A control method for a water heater system, characterized in that the control method is applied to the water heater system according to any one of claims 1 to 8, and the water heater system further includes a circulating pump, a second temperature sensor and The second regulating valve, the circulation pump is arranged in the zero cold water heating circuit, the second temperature sensor is arranged in the water inlet pipe, and the second regulating valve is arranged in the circulation pipe; the control method includes the following step: S1. Judging whether the water heater system stops water output, if so, execute step S2; S2. Control the circulating pump and the second regulating valve to open; S3. Comparing the temperature T1 detected by the first temperature sensor with the first set temperature Ta, if T1>Ta, controlling the opening of the first regulating valve; S4. Comparing the temperature T2 detected by the second temperature sensor with the first set temperature Ta, if T2≥Ta+ΔT2, control the circulating pump, the first regulating valve and the second regulating valve to close , where ΔT2 is the second set deviation value. 10. The control method of the water heater system according to claim 9, characterized in that step S1 comprises the following steps: S11. Judging whether the water heater system stops water output, if so, execute step S2, otherwise execute step S12; S12. If T1≥Tb, control the opening of the first regulating valve, and control the opening of the first regulating valve to increase, wherein Tb is the second set temperature; S13. If any one of T2>Td and T3>Ta is satisfied, control the opening of the first regulating valve to remain unchanged, where Td is the fourth set temperature, and Td<Ta, T3 is the outlet pipe of the outlet water temperature. 11. The control method of the water heater system according to claim 10, wherein the first regulating valve is a stepless regulating valve, and in step S12, the opening degree of the first regulating valve is gradually increased to perform stepless adjust. 12. The control method of the water heater system according to claim 10, characterized in that the step S1 further comprises the following steps: S14. If T1≤Tc, execute step S15, wherein Tc is the third set temperature and Tb>Tc>Ta; S15. Control the opening of the second regulating valve to gradually decrease. 13. The control method of the water heater system according to claim 9, characterized in that step S3 comprises the following steps: S31. If T1>Ta, control the first regulating valve to open, otherwise execute step S32; S32. Control the water heater to start heating. 14. The control method of the water heater system according to claim 9, characterized in that, the control method further comprises the following steps: S5. Comparing the temperature value T1 detected by the first temperature sensor with the first set temperature Ta, if T1<Ta-ΔT1 is satisfied, return to step S2, where ΔT1 is the first set deviation value.

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