TW202007887A - Heat storage type electric water heater with energy-saving and hot water supply method thereof - Google Patents

Abstract

A heat storage type electric water heater with energy-saving and a hot water supply method are provided. The heat storage type electric water heater includes a water storage tank, a water volume regulating valve, an outlet water temperature sensor and a control circuit. The water storage tank has a cold water inlet pipe, a hot water outlet pipe, and a heating module. The water volume regulating valve is connected to the cold water inlet pipe and the hot water outlet pipe. The water volume regulating valve adjusts the proportion of the mixed water between the cold water inlet pipe and the hot water outlet pipe according to a water volume adjustment signal, and then outputs a mixed hot water for use by the personnel. The outlet water temperature sensor senses an effluent water temperature of the mixed hot water. The control circuit outputs the water volume adjustment signal according to the comparison result of the effluent water temperature and a target water temperature, so that the effluent water temperature can reach the target water temperature. Thereby, the heat storage type electric water heater can avoid scalding the user and save energy and electricity.

Description

Thermal storage type electric water heater with energy-saving heating and its hot water supply method

The invention relates to an electric water heater, and in particular to a storage type electric water heater with a water storage bucket and a hot water supply method thereof.

Since the water storage bucket in the current thermal storage type electric water heater does not provide digital constant temperature hot water output, high-temperature hot water is likely to scald people in the bath. The main reason for the above-mentioned problems is that the water storage bucket is usually set at a set temperature sufficient for a family to use for bathing, so as to avoid repeatedly heating the water in the water storage bucket, but the set temperature is usually high. In addition, on the other hand, since the water temperature of the hot water faucet is manually controlled, the water temperature is high at this time, so it is necessary to control the water temperature by personnel at the same time to reduce the aforementioned high-temperature hot water, but it also wastes a lot of the water in the storage tank has been heated Good precious hot water resources.

Embodiments of the present invention provide a heat storage type electric water heater with energy-saving heating and a method for supplying hot water thereof, through a method of supplying hot water while mixing cold water to prevent personnel from being scalded by using hot water.

Embodiments of the present invention provide a thermal storage type electric water heater with energy-saving heating, which includes a water storage barrel, a water volume adjustment valve, an outlet temperature sensor, and a control circuit. The water storage barrel has a cold water inlet pipe, a hot water outlet pipe and a heating module. The water volume regulating valve is arranged outside the water storage barrel, and communicates with the cold water inlet pipe and the hot water outlet pipe. The water volume regulating valve adjusts the ratio of the mixed water volume between the cold water inlet pipe and the hot water outlet pipe according to the water quantity adjustment signal, and then outputs the mixed hot water for personnel to use. The outlet water temperature sensor senses the outlet water temperature of the mixed hot water. The control circuit is electrically connected to the water volume regulating valve and the outlet water temperature sensor, and the control circuit outputs a water volume adjustment signal according to the comparison result of the outlet water temperature and the target water temperature, so that the outlet water temperature can reach the target water temperature.

An embodiment of the present invention provides a hot water supply method for a thermal storage type electric water heater. The thermal storage type electric water heater has a water volume regulating valve, which is disposed outside the water storage barrel of the thermal storage type electric water heater, and is connected to the cold water inlet of the water storage barrel. Water pipes and hot water outlet pipes. The hot water supply method includes: sensing the outlet water temperature of the mixed hot water, wherein the mixed hot water is a water volume adjustment valve, which adjusts the ratio of the mixed water volume between the cold water inlet pipe and the hot water outlet pipe according to the water volume adjustment signal, and then outputs the mixed hot water for personnel use. Compare the effluent water temperature with the target water temperature, and output the water volume adjustment signal according to the comparison result, so that the effluent water temperature can reach the target water temperature.

In summary, the thermal storage type electric water heater with energy-saving heating provided by the embodiments of the present invention and the hot water supply method thereof are mixed with cold water during the output of hot water, and the hot water is maintained at a constant temperature output, whereby the present invention can In addition to slowing down the consumption rate of hot water inside the water storage tank, it can also avoid high-temperature scalding when the hot water output is turned on, and at the same time achieve the effect of power saving and energy saving.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention, but these descriptions and the drawings are only used to illustrate the present invention, not the rights of the present invention Any restrictions on the scope.

1‧‧‧Electric water heater

10‧‧‧Water storage bucket

12‧‧‧cold water inlet pipe

14‧‧‧Hot water outlet pipe

100‧‧‧Control circuit

101‧‧‧Effluent flow sensor

102‧‧‧Inlet water temperature sensor

103‧‧‧Water temperature sensor in the barrel

104‧‧‧Outlet temperature sensor

105‧‧‧Water volume regulating valve

1051‧‧‧Hot water communication hole

1053‧‧‧Communication hole for cold water

1055‧‧‧Mixed water output hole

106‧‧‧Heating module

107‧‧‧Memory circuit

S301‧‧‧Set target water temperature

S303‧‧‧ Is there any water

S305‧‧‧stop hot water

S307‧‧‧sensing water temperature

S309‧‧‧The temperature of the effluent reaches the target temperature

S311‧‧‧Control water volume regulating valve to stop hot water regulation

S313‧‧‧Control water quantity regulating valve to open hot water regulation

FIG. 1 is a schematic diagram of an electric storage water heater with energy-saving heating provided by an embodiment of the present invention.

2 is a functional block diagram of a thermal storage electric water heater provided by an embodiment of the present invention.

3 is a flow chart of hot water supply of an electric storage water heater according to an embodiment of the present invention.

4 is a schematic diagram of the operation of the thermal storage electric water heater provided by the embodiment of the present invention.

Embodiments of the present invention provide a heat storage type electric water heater with energy-saving heating and a hot water supply method thereof. Specifically, the thermal storage electric water heater (hereinafter referred to as the electric water heater) described in the present invention when hot water is turned on for hot water output, the hot water output from the electric water heater is mixed with cold water at the same time, so that the beginning The temperature of the hot water output by the electric water heater is lower than the temperature of the hot water inside the electric water heater, and then the output of the hot water inside the electric water heater is gradually increased, so that the temperature of the hot water output for the personnel can be increased to a suitable temperature. The present invention enables the user to effectively avoid scalds when the hot water is turned on by using this hot water supply method, and can slow down the hot water consumption speed.

[Example of thermal storage electric water heater with energy-saving heating]

Please refer to FIG. 1, which is a schematic diagram of a thermal storage electric water heater with energy-saving heating provided by an embodiment of the present invention. The thermal storage type electric water heater 1 with energy-saving heating of this embodiment is mixed with cold water at the same time through the output of hot water, thereby reducing the temperature of the hot water initially supplied by the electric water heater. The electric water heater 1 shown in FIG. 1 includes, for example, a water storage tank 10. The internal structure of the water storage tank 10 includes at least a cold water inlet pipe 12, a hot water outlet pipe 14 and a heating module 16. The cold water inlet pipe 12 and the hot water outlet pipe 14 are respectively penetrated inside the water storage bucket 10 from the outside of the water storage bucket 10, and the cold water inlet pipe 12 allows the cold water to flow into the water storage bucket 10, and the water in the water storage bucket 10 is heated by the heating module 16 Then, the hot water outlet pipe 14 will heat the water from the water storage barrel 10 out of the water storage barrel 10.

In this embodiment, a water volume regulating valve 105 is added outside the water storage tank 10, and the water volume regulating valve 105 is respectively connected to the cold water inlet pipe 12 and the hot water outlet pipe 14 to make the cold water and hot water outlet pipe 14 of the cold water inlet pipe 12 The hot water can flow into the water volume regulating valve 105 for mixing, and the water volume regulating valve 105 mixes the incoming hot water and cold water to output mixed hot water for use. In addition, the water temperature sensor 103 in the water storage bucket 10 is used to detect the current water temperature in the water storage bucket 10 for the heating module 16 to control the heating according to the sensing result of the water temperature sensor 103 in the bucket The water temperature of the water storage tank 10 reaches the corresponding set temperature.

Further, the water volume regulating valve 105 has a hot water communication hole 1051, a cold water communication hole 1053, and a mixed water output hole 1055. The hot water communication hole 1051 communicates with the hot water outlet pipe 14, the cold water communication hole 1053 communicates with the cold water inlet pipe 12, the mixed water output hole 1055 communicates with the hot water communication hole 1051 and the cold water communication hole 1053, so that the mixed water output hole 1055 outputs mixed heat water. The water quantity regulating valve 105 controls the amount of water flowing into the water quantity regulating valve 105 from the hot water outlet pipe 14 or the cold water inlet pipe 12 according to the water quantity regulating signal. The water volume adjustment signal described here is used to adjust the water volume ratio between the hot water flowing into the water volume regulating valve and the cold water. In an embodiment, the hot water communication hole 1051 and the cold water communication hole 1053 in the water quantity regulating valve 105 respectively have valves (not shown), and the opening or closing of the valves is controlled by the water quantity regulating signal. That is, the water volume adjustment signal can determine how much water flows through the hot water communication hole 1051 and the cold water communication hole 1053. Further, the degree of opening or closing of the valve is controlled by a stepping motor, for example.

For example, when the water volume regulating valve 105 receives the hot water output operation of turning on the electric water heater 1, the cold water communication hole 1053 is in an open state, so that the cold water entering the cold water inlet pipe 12 can continuously flow into the water volume regulating valve 105, and the hot water The communication hole 1051 is gradually switched from the closed state to the open state, so that the amount of hot water flowing into the water flow regulating valve 105 of the hot water outlet pipe 14 can be gradually changed from small to large, and then the temperature of the mixed hot water output can be gradually increased .

However, in another embodiment, the water volume regulating valve 105 can also gradually change the cold water communication hole 1053 from the open state to the closed state when receiving the hot water output operation of turning on the electric water heater 1, so that the amount of cold water entering the water pipe 12 flows into The amount of cold water in the regulating valve 15 can gradually change from large to small. The hot water communication hole 1051 is gradually switched from the closed state to the open state, so that the amount of hot water flowing into the water volume regulating valve 105 of the hot water outlet pipe 14 can be gradually changed from small to large. The above-mentioned operation method of the water volume adjustment method is only an example, and is not intended to limit the present invention.

In addition, in order to know when the electric water heater 1 starts the hot water output operation, that is, when the user turns on the hot water faucet (not shown). In an embodiment, an output water flow sensor 101 is provided at the output end of the water quantity regulating valve 105. Specifically, the outlet flow sensor 101 is connected to the output end of the mixed water output hole 1055, and the outlet flow sensor 101 can be used when the hot water faucet is opened by the user, and the water flow regulating valve 105 passes through the mixed water output hole 105 The output water flow can flow through the water flow sensor 101 and then output by the hot water faucet.

Furthermore, the outlet water temperature sensor 104 is provided at the output end of the water quantity regulating valve 105, and is used to sense the water temperature of the water quantity regulating valve 105 to output mixed water hot water. The water supply quantity regulating valve 105 can be relatively adjusted according to the sensing result The water volume ratio between the hot water flowing into the water volume regulating valve and the cold water makes the water temperature of the mixed water hot water output by the water volume regulating valve 105 reach the corresponding set target water temperature.

[Functional block embodiment of thermal storage electric water heater]

With reference to FIG. 1 and please refer to FIG. 2, FIG. 2 is a functional block diagram of a thermal storage electric water heater provided by an embodiment of the present invention. The control circuit 100 shown in FIG. 2 is the control core of the electric water heater 1 and can be used to control the heating of various components. The control circuit 100 is electrically connected to the outlet water flow sensor 101, the inlet water temperature sensor 102, the bucket water temperature sensor 103, the outlet water temperature sensor 104, the water volume regulating valve 105, the heating module 106 and the memory circuit 107, respectively. The control circuit 100 can be matched with firmware or software through a hardware circuit, and the hardware circuit in the control circuit 100 can be an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) chip, or a system on chip (SOC) One of them or any combination.

The control circuit 100 can obtain the temperature of the cold water flowing into the water storage tank 10 through the inlet water temperature sensor 102. The inlet water temperature sensor 102 is disposed on the side of the cold water inlet pipe 12. The control circuit 100 can obtain the cold water temperature and the water temperature in the water storage bucket respectively according to the sensing results of the incoming water temperature sensor 102 and the bucket water temperature sensor 103, and relatively control the heating of the heating module 106 according to the sensing results of these water temperatures Operate in order to make the water temperature in the water storage tank 10 reach the set water temperature and keep it at a constant temperature. As for how to control the water temperature inside the water storage barrel 10 to maintain a constant temperature, those skilled in the art can know it, and will not elaborate here.

In an embodiment, the control circuit 10 also knows whether the hot water faucet of the electric water heater 1 is turned on according to the sensing result of the outlet water flow sensor 101. For example, when the water flow sensor 101 does not sense the flow of water, the control circuit 100 determines that the hot water tap of the electric water heater 1 is not turned on. Conversely, when the water flow sensor 101 senses that a water flow is passing, the control circuit 10 determines that the hot water tap of the electric water heater 1 has been turned on, that is, the electric water heater 1 can provide hot water output operation at this time.

Further, when the control circuit 100 knows through the outlet flow sensor 101 that the hot water tap of the electric water heater 1 has been turned on, the control circuit 100 outputs a water volume adjustment signal to the water volume adjustment valve 105 to control the hot water in the water volume adjustment valve 105 Mixed with the cold water, and at the same time, through the outlet water temperature sensor 104, it can immediately sense whether the temperature of the mixed hot water output by the water volume adjustment valve 105 reaches the set target water temperature, and then adjust the water volume adjustment signal accordingly, in order to make the water volume The mixed hot water finally output by the regulating valve 105 can reach the set target water temperature.

For example, when the hot water faucet of the electric water heater 1 is not turned on, it means that the water volume regulating valve 105 will not have mixed hot water output. At this time, the control circuit 100 controls the water volume regulating valve 105 to stop the mixed hot water output, or at this time The control circuit 100 controls that the hot water communication hole 1051 of the water volume regulating valve is in a closed state, that is, the hot water of the hot water outlet pipe 14 cannot flow into the water volume regulating valve 105.

When the hot water tap of the electric water heater 1 is turned on, the control circuit 100 outputs a water volume adjustment signal to the water volume adjustment valve 105 at this time. This water quantity adjustment signal keeps the cold water communication hole 1053 of the water quantity adjustment valve 105 in the open state immediately after the hot water output of the electric water heater 1 is turned on, that is, the cold water of the cold water inlet pipe 12 flows into the water quantity adjustment valve 105. At the same time, the control circuit 100 will also control the hot water communication hole 1051 to gradually change from the closed state to the open state, that is, the amount of hot water flowing into the water volume regulating valve 105 from the hot water outlet pipe 14 can be gradually changed from small to large, so that the final water volume can be adjusted. The water temperature of the mixed hot water output by the valve 105 can reach the set target water temperature.

It is worth noting that in this embodiment, when the hot water output of the electric water heater 1 is just turned on, the mixed hot water output by the water quantity regulating valve 105 is mixed with cold water, so the water temperature of the mixed hot water is lower than the water storage bucket 10 The water temperature inside can effectively prevent people from being scalded by high temperature hot water when they use the electric water heater at the beginning.

In one embodiment, when the hot water tap of the electric water heater 1 has not been turned on, the control circuit 100 controls the heating module 106 to heat the water in the water storage tank 10 to the first hot water temperature. When the hot water faucet of the electric water heater 1 is turned on, the control circuit 100 controls the heating module 106 to heat the water in the water storage tank 10 to the second hot water temperature. The first hot water temperature is greater than room temperature, and the second hot water temperature is greater than the first hot water temperature, and the second hot water temperature is greater than or equal to the target water temperature. In addition, the first hot water temperature, the second hot water temperature and the target water temperature described in this embodiment can be stored in the memory circuit 107 for the control circuit 100 to obtain the set values of these temperatures from the memory circuit To perform corresponding control on the relevant water temperature of the electric water heater 1. The above-mentioned electric water heater 1 keeps the water storage tank 10 at different constant temperatures before and after the hot water faucet is opened. This method can save energy and save electricity, and can also quickly heat the water storage tank 10 to a set temperature after turning on the hot water faucet. In order to make the final mixed hot water output reach the target water temperature.

[Example of hot water supply method of thermal storage electric water heater]

Please refer to FIG. 3, which is a flow chart of hot water supply of an electric storage water heater according to an embodiment of the present invention. The process shown in FIG. 3 can perform the following steps, for example, with reference to the architecture of FIGS. 1 and 2.

In step S301, first, the electric water heater 1 sets a target water temperature, and this target water temperature refers to the water temperature at which the water volume adjustment valve 105 outputs mixed hot water. The target water temperature may be a preset value or a temperature value set manually. For example, the control circuit 100 may receive the target water temperature input by humans according to the control panel provided by the electric water heater 1 for human operation, and store the target water temperature in the memory circuit 107.

In step S303, it is determined whether there is water. In this step, the control circuit 100 judges whether the water flow sensor 101 senses whether the water flow is passing or not, and can relatively know whether the hot water tap of the electric water heater 1 is turned on.

In step S305, when the determination in step S303 is NO, the hot water output is stopped. The stop of the hot water output means that the hot water faucet is not turned on, so the water volume regulating valve 105 does not output mixed hot water through the mixed water output hole 1055, that is, the control circuit 100 can control the water volume regulating valve 105 at this time The hot water communication hole 1051 is in a closed state, and the hot water in the water storage tank 10 cannot output hot water through the hot water outlet pipe 14 to the water volume regulating valve 105. After step S305 is executed, it returns to step S303 to continue execution.

In step S307, when it is determined as YES in step S303, the water temperature is further sensed. The outlet water temperature here refers to the water temperature of the mixed hot water output by the water amount adjustment valve 105 through the mixed water output hole 1055. In one embodiment, the control circuit 12 can obtain the water temperature through the sensing result of the water temperature sensor 104.

In step S309, it is determined whether the water temperature reaches the target water temperature. In an embodiment, the control circuit 100 compares the sensing result of the outlet water temperature sensor 104 with the target water temperature to know whether the outlet water temperature reaches the target water temperature.

In step S311, when it is judged as YES in step S309, the water volume adjustment valve 105 is controlled to stop the hot water adjustment. The stop of hot water regulation is that the control circuit 100 maintains the last output water quantity adjustment signal to the water quantity adjustment valve 105, so that the mixing ratio of the hot water and the cold water in the water quantity adjustment valve 105 is fixed, so the water quantity can be effectively ensured The water temperature of the mixed hot water output from the regulating valve 105 is maintained at a constant temperature state of the target water temperature.

In step S313, when the determination in step S309 is NO, the water regulating valve 105 is controlled to open the hot water regulation. Here, the hot water adjustment is turned on by the control circuit 100 according to the judgment result of step S309 and correspondingly outputs a water quantity adjustment signal to the water quantity adjustment valve 105.

For example, when the effluent water temperature is lower than the target water temperature, the control circuit 100 outputs a water quantity adjustment signal to the water quantity adjustment valve 105 at this time, and the proportion of hot water in the mixed hot water of the control water quantity adjustment valve 105 to cold water is increased. To increase the temperature of the mixed hot water. In one embodiment, the water flow adjustment signal can control the flow of cold water flowing into the water flow adjustment valve 105 to remain unchanged, while the flow of hot water flowing into the water flow adjustment valve 105 increases. Or in another embodiment, the water flow adjustment signal may also control the flow of cold water flowing into the water flow adjustment valve 105 to decrease, while the flow of hot water flowing into the water flow adjustment valve 105 increases or remains unchanged.

Conversely, when the temperature of the effluent water is higher than the target water temperature, the control circuit 100 outputs a water volume adjustment signal to the water volume adjustment valve 105 at this time, and the ratio of hot water to cold water in the mixed hot water of the control water volume adjustment valve 105 is reduced, thereby Lower the water temperature of the mixed hot water. In one embodiment, the water flow adjustment signal can control the flow of cold water flowing into the water flow adjustment valve 105 to remain unchanged, while the flow of hot water flowing into the water flow adjustment valve is reduced. Or in another embodiment, the water flow adjustment signal can also control the flow of cold water flowing into the water flow adjustment valve 105 to increase, while the flow of hot water flowing into the water flow adjustment valve 105 decreases or remains unchanged.

After step S313 is executed, it returns to step S309 and continues to be executed until the outlet water temperature reaches the target water temperature.

[Operation Example of Thermal Storage Electric Water Heater]

Please refer to FIG. 4 in conjunction with FIGS. 1 and 2. FIG. 4 is a schematic diagram of the operation of the thermal storage electric water heater provided by the embodiment of the present invention. Before time T1, the hot water faucet is not turned off. At this time, the water flow sensor 101 does not detect the water flow, the water temperature sensor 104 has not yet started operation or the water temperature sensed at this time is equal to Room temperature. The control circuit 100 knows from the water flow sensor 101 that the electric water heater 1 has not yet turned on the hot water output. Therefore, the water regulating valve 105 does not output the mixed hot water through the mixed water output hole 1055. The hot water flow shown in FIG. 4 refers to the amount of water output from the hot water outlet pipe 14 to the water volume regulating valve 105. It can be clearly seen from the figure that before the time T1, the water volume regulating valve 105 does not pass through the mixed water output hole 1055 outputs mixed hot water, so the hot water communication hole 1051 of the water volume regulating valve 105 is closed at this time, that is, the amount of water output from the hot water outlet pipe 14 to the water volume regulating valve 105 is zero.

When the hot water faucet is turned on after time T1, the water flow sensor 101 detects the water flow, and the water temperature sensor 104 also senses the water temperature. The control circuit 100 knows that the electric water heater 1 has turned on the hot water output according to the water flow sensor 101. Therefore, the mixed water output hole 1055 of the water volume adjustment valve 105 outputs mixed hot water. The control circuit 100 will output a water volume adjustment signal to the water volume adjustment valve 105 after time T1. At this time, the hot water communication hole 1051 of the water volume adjustment valve 105 is closed at time T1 and will gradually be switched to open, so the hot water outlet pipe 14 outputs to the water volume The water volume of the regulating valve 105 will gradually increase from time T1 to T2, and the temperature of the outlet water sensed by the outlet water temperature sensor 104 at this time will also rise from the time T1 to the target water temperature at the time T2. It is worth noting that when the hot water faucet is opened at time T1, the cold water communication hole 1053 in the water volume regulating valve 105 is open, that is, the cold water of the cold water inlet pipe 12 will flow into the water volume regulating valve 105 and proceed with the hot water After mixing water, the mixed water output hole 1055 of the water volume regulating valve 105 outputs mixed hot water for use by personnel.

Specifically, in this case, when the electric water heater just turned on the hot water faucet, the mixed hot water output from the water quantity regulating valve 105 at this time was mixed with cold water, so the water temperature of the mixed hot water would be lower than the water temperature in the water storage tank 10 at this time. Therefore, the hot water supply method in this case effectively prevents the user from being scalded by high temperature when hot water is just turned on.

[Efficacy of Examples]

In summary, the thermal storage type electric water heater with energy-saving heating provided by the embodiments of the present invention and the hot water supply method thereof, the mixed hot water output by the electric water heater is mixed with cold water, which can effectively avoid the high temperature of the hot water output just turned on It can scald people, and can slow down the consumption of hot water inside the water storage barrel, so as to achieve the effect of saving electricity and energy. In addition, the mixed hot water can maintain constant temperature output to avoid discomfort when the water temperature rises and falls suddenly.

The above is only an embodiment of the present invention, and it is not intended to limit the patent scope of the present invention.

1‧‧‧Electric water heater

10‧‧‧Water storage bucket

12‧‧‧cold water inlet pipe

14‧‧‧Hot water outlet pipe

101‧‧‧Effluent flow sensor

102‧‧‧Inlet water temperature sensor

103‧‧‧Water temperature sensor in the barrel

104‧‧‧Outlet temperature sensor

105‧‧‧Water volume regulating valve

1051‧‧‧Hot water communication hole

1053‧‧‧Communication hole for cold water

1055‧‧‧Mixed water output hole

106‧‧‧Heating module

Claims (10)

A heat storage type electric water heater with energy-saving heating includes: a water storage barrel with a cold water inlet pipe, a hot water outlet pipe and a heating module; a water quantity regulating valve, which is arranged outside the water bucket and communicates with the The cold water inlet pipe and the hot water outlet pipe, the water quantity regulating valve adjusts the mixed water ratio between the cold water inlet pipe and the hot water outlet pipe according to a water quantity adjustment signal, and then outputs a mixed hot water for personnel to use; A sensor to sense an outlet water temperature of the mixed hot water; and a control circuit to electrically connect the water volume regulating valve and the outlet water temperature sensor, the control circuit outputs according to a comparison result of the outlet water temperature and a target water temperature The water volume adjustment signal enables the effluent water temperature to reach the target water temperature. The thermal storage electric water heater according to claim 1, wherein the water quantity regulating valve has a hot water communication hole, a cold water communication hole and a mixed water output hole, the hot water communication hole communicates with the hot water outlet pipe, and the cold water communicates The hole communicates with the cold water inlet pipe, the mixed water output hole communicates with the hot water communication hole and the hot water communication hole, the mixed water output hole outputs the mixed hot water, and the water volume regulating valve controls the hot water output according to the water volume regulating signal The water volume of the water pipe or the cold water inlet pipe flows into the water volume regulating valve. The thermal storage electric water heater of claim 2, wherein the control circuit controls the amount of water flowing from the hot water outlet pipe into the water flow regulating valve from small to large when the thermal storage electric water heater starts hot water output At the same time, the water volume regulating valve causes the water volume of the cold water inlet pipe to continuously flow into the water volume regulating valve. The thermal storage electric water heater of claim 3, wherein when the outlet water temperature is lower than the target water temperature, the water volume adjustment signal controls the amount of water flowing into the water volume adjustment valve from the hot water outlet pipe until the outlet water temperature is equal to At the target water temperature, the water volume adjustment signal controls the quantity of water flowing into the water volume adjustment valve from the hot water outlet pipe. The thermal storage electric water heater of claim 3, wherein the control circuit controls the heating module to maintain the temperature of the water in the storage tank at a first level when the thermal storage electric water heater does not turn on hot water output Hot water temperature, the control circuit controls the heating module to maintain the water temperature in the water storage tank at a second hot water temperature when the thermal storage electric water heater starts hot water output, the first hot water The temperature is greater than room temperature, the second hot water temperature is greater than the first hot water temperature, and the second hot water temperature is greater than or equal to the target water temperature. A hot water supply method for a thermal storage type electric water heater. The thermal storage type electric water heater has a water volume regulating valve which is arranged outside a water storage barrel of the thermal storage type electric water heater and communicates with a water storage barrel. A cold water inlet pipe and a hot water outlet pipe, the method includes: sensing the temperature of an outlet water of a mixed hot water, wherein the mixed hot water is the water quantity regulating valve to adjust the cold water inlet pipe and the hot water outlet according to a water quantity regulating signal The ratio of the mixed water volume between the two pipes is output to the mixed hot water for use by the personnel; the temperature of the outlet water is compared with a target water temperature; and the water volume adjustment signal is output according to the comparison result, so that the temperature of the outlet water can reach the target water temperature . The hot water supply method according to claim 6, wherein the water quantity regulating valve has a hot water communication hole, a cold water communication hole and a mixed water output hole, the hot water communication hole communicates with the hot water outlet pipe, and the cold water communication hole The cold water inlet pipe is connected, the mixed water output hole communicates with the hot water communication hole and the hot water communication hole, the mixed water output hole outputs the mixed hot water, and the water quantity regulating valve controls the hot water outlet pipe according to the water quantity regulating signal Or the cold water inlet pipe flows into the water quantity regulating valve. The hot water supply method according to claim 7, wherein when the thermal storage electric water heater starts hot water output, the amount of water that controls the hot water outlet pipe to flow into the water volume regulating valve changes from small to large, and the water volume regulating valve causes the The amount of cold water entering the water pipe continuously flows into the water volume regulating valve. The hot water supply method of claim 8, wherein when the effluent water temperature is less than the target water temperature, the water volume adjustment signal controls the amount of water flowing into the water volume adjustment valve of the hot water outlet pipe until the effluent water temperature is equal to the At the target water temperature, the water volume adjustment signal controls the amount of water flowing into the water volume adjustment valve from the hot water outlet pipe to a fixed amount. The hot water supply method according to claim 8, wherein when the thermal storage type electric water heater does not turn on the hot water output, the heating module is controlled to maintain the water temperature in the water storage barrel at a first hot water temperature. When the hot water heater is turned on for hot water output, the water temperature in the storage tank is controlled to maintain a second hot water temperature, the first hot water temperature is greater than room temperature, and the second hot water temperature is greater than the first hot water Temperature, the second hot water temperature is greater than or equal to the target water temperature.

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