阅读说明：本技术 一种饮水机及其水温控制方法 (Water dispenser and water temperature control method thereof ) 是由 王桂林 于 2019-10-11 设计创作，主要内容包括：本发明涉及一种饮水机及其水温控制方法,包括净水装置和由PLC系统控制的沸水管道,所述净水装置上布设有原水管、纯水管及浓水管,所述沸水管道起始端与所述净水装置纯水出口连接,所述沸水管道的起始端和终止端之间连接有若干条由PLC系统控制功能器件调节水温的功能回路。本发明还公开了一种水温调节控制方法,使本饮水机能根据需求得到不同温度的饮用水。(The invention relates to a water dispenser and a water temperature control method thereof, and the water dispenser comprises a water purifying device and a boiling water pipeline controlled by a PLC system, wherein a raw water pipe, a pure water pipe and a concentrated water pipe are distributed on the water purifying device, the starting end of the boiling water pipeline is connected with a pure water outlet of the water purifying device, and a plurality of functional loops for adjusting the water temperature by a PLC system control functional device are connected between the starting end and the terminating end of the boiling water pipeline. The invention also discloses a water temperature adjusting and controlling method, so that the water dispenser can obtain drinking water with different temperatures according to requirements.)

1. A drinking machine comprises a water purifying device and a boiling water pipeline controlled by a PLC system, wherein a raw water pipe, a pure water pipe and a concentrated water pipe are distributed on the water purifying device, the starting end of the boiling water pipeline is connected with a pure water outlet of the water purifying device, and the drinking machine is characterized in that a plurality of functional loops for adjusting the water temperature by a PLC system control functional device are connected between the starting end and the terminating end of the boiling water pipeline;

a sensor, a heater, a first temperature sensor, a first electromagnetic valve, a second temperature sensor and a water outlet switch are sequentially arranged on the boiling water pipeline;

the starting end of the warm water loop is connected between the first temperature sensor and the first electromagnetic valve, the terminating end of the warm water loop is connected between the first electromagnetic valve and the second temperature sensor and is positioned at one end close to the first electromagnetic valve, and the second electromagnetic valve, the radiator and the fourth electromagnetic valve are sequentially distributed on the warm water loop;

the starting end of the cold water loop is connected between the radiator and the third electromagnetic valve, the terminating end of the cold water loop is connected between the first electromagnetic valve and the second temperature sensor and is positioned at one end close to the second temperature sensor, the third electromagnetic valve and the heat exchanger are sequentially distributed on the cold water loop, the heat exchanger is provided with a hot water inlet, a cold water inlet, a hot water outlet and a cold water outlet, the hot water inlet and the hot water outlet are connected with the cold water loop, the cold water inlet is connected with the concentrated water pipe, and the cold water outlet is connected with the drain pipe;

the water outlet switch comprises a child lock switch, a display module and an input module, the display module is respectively connected with the input module and the PLC system, and the display module can display the input temperature of the input module and the signals output by the PLC system;

the sensor, the first temperature sensor, the second temperature sensor and the input module input signals to the PLC system, and the PLC system is in control connection with the radiator fan motor, the heater and the electromagnetic valves.

2. The water dispenser of claim 1, wherein the boiling water pipeline is connected with the warm water loop, the warm water loop is connected with the cold water loop, and the cold water loop is connected with the boiling water pipeline by a tee joint.

3. The water dispenser of claim 1 wherein the sensor is a pressure sensor or a water flow sensor.

4. The water dispenser of claim 1, wherein the heater is heated slowly to prevent scalding.

5. The water dispenser of claim 1, wherein the PLC system can perform a determination based on a signal input from the second temperature sensor and output a signal to the radiator fan motor for adjusting the air speed.

6. The water dispenser of claim 1, wherein a gas-liquid separation device is arranged between the second temperature sensor and the water outlet switch, and the steam is introduced into the heat exchanger through a steam pipeline and condensed into water which flows out along with the water outlet pipe.

7. A water temperature control method of a water dispenser is characterized by comprising the following steps:

the method includes the steps that firstly, a system is started, and a water dispenser is electrified;

secondly, inputting the required drinking water temperature T1 in the input module;

thirdly, the PLC system judges that the input temperature T1 is less than or equal to 40 ℃, if not, the child lock is required to be unlocked, and if yes, the next step is carried out;

fourthly, turning on a water outlet switch;

fifthly, judging that the input temperature T1 is less than or equal to 40 ℃, if yes, switching to the cold water gear in the step, and if not, switching to the next step;

sixthly, detecting data in the pipe by a sensor and outputting a signal to a PLC system, outputting a pressure signal if the sensor is a pressure sensor, and outputting a flow signal if the sensor is a water flow sensor;

the peace PLC system judges whether the output signal data of the sensor is in a normal value range, if not, the heater stops working, and the PLC system outputs a signal to the display module to display and alarm, if so, the next step is carried out;

and the PLC system judges whether default power parameters exist in the system, if so, the steps of 'hot water gear' and 'cold water gear' are respectively accessed, otherwise, the next step is carried out;

the power of the self-supporting heater is increased, the first temperature sensor senses the temperature rise, and a signal is output to the PLC system;

judging whether the temperature of water in the pure water pipe does not rise within 5s by the PLC system, if not, adjusting the power of the heater, continuing rising, and if so, entering the next step;

setting the stable temperature as the current boiling point temperature T;

setting the default power parameter to be lower than the heater power corresponding to the current boiling point temperature by using the PLC system;

the selection of the boiling water grade;

the first electromagnetic valve is opened, the second electromagnetic valve is closed, the third electromagnetic valve is closed, and the fourth electromagnetic valve is closed;

and (4) discharging water from the water outlet and finishing water receiving.

8. The water temperature control method of the water dispenser according to claim 7, characterized in that the temperature control method of the cold water grade of step fifthly further comprises the following steps:

(5.11) the heater is not started;

(5.12) opening the first electromagnetic valve, closing the second electromagnetic valve, closing the third electromagnetic valve and closing the fourth electromagnetic valve;

and (5.13) discharging water from the water outlet in the step (A), and finishing water receiving.

9. The water temperature control method of the water dispenser according to claim 7, characterized in that the step of controlling the temperature of the hot water level (70 ℃ to T1 to 90 ℃) further comprises the following steps:

(8.11) closing the first electromagnetic valve, opening the second electromagnetic valve, closing the third electromagnetic valve and opening the fourth electromagnetic valve;

(8.12) the second temperature sensor detects the water temperature in the water pipe;

(8.13) judging whether the temperature is equal to T1, if so, discharging water to the water outlet of the step natural water, and if not, entering the next step;

(8.14) judging whether the temperature is less than or equal to T1, if so, returning to the step (8.12) through the step of gradually slowing down the working speed of the fan;

(8.15) if not, returning to the step (8.12) through the step of 'the operating speed of the fan is gradually increased'.

10. The water temperature control method of the water dispenser according to claim 7, characterized in that the temperature control method of the cold water level (40 ℃ < T1 ≤ 70 ℃) further comprises the following steps:

(8.21) the first electromagnetic valve is closed, the second electromagnetic valve is opened, the third electromagnetic valve is opened, and the fourth electromagnetic valve is closed;

(8.22) the second temperature sensor detects the water temperature in the water pipe;

(8.23) judging whether the temperature is equal to T1, if so, discharging water to the water outlet of the step natural water, and if not, entering the next step;

(8.24) judging whether the temperature is less than or equal to T1, if so, returning to the step (8.12) through the step of gradually slowing down the working speed of the fan;

and (8.25) if not, returning to the step (8.12) through the step of 'the operating speed of the fan is gradually increased'.

Technical Field

The invention relates to a household appliance, in particular to a water dispenser and a water temperature control method thereof.

Background

The existing water dispenser generally has cold water and boiling water outlets. But the water at the cold water outlet of some water dispensers is cold water which is not boiled; some drinking machines boil a large amount of cold water once and drink for a long time after cooling, and the cold boiled water stored for a long time is not fresh and is not good for health.

The boiling water outlet of the existing water dispenser can burst a large amount of boiling water once opened, and children or adults can be scalded without noticing.

The existing market calls a water dispenser which can obtain drinking water with different temperatures according to different requirements.

Disclosure of Invention

The purpose of the invention is: aiming at the problem that cold boiled water of a water dispenser is not fresh in the prior art, the water dispenser capable of obtaining fresh drinking water at various temperatures is provided, and a user is prevented from being scalded when the user obtains the boiled water; another object of the invention is: provides a water temperature control method of a water dispenser which can automatically take drinking water with required water temperature according to the required water temperature.

The technical scheme of the invention is to provide a water dispenser, which comprises a water purifying device and a boiling water pipeline controlled by a PLC system, wherein a raw water pipe, a pure water pipe and a concentrated water pipe are distributed on the water purifying device, and the starting end of the boiling water pipeline is connected with a pure water outlet of the water purifying device;

a sensor, a heater, a first temperature sensor, a first electromagnetic valve, a second temperature sensor and a water outlet switch are sequentially arranged on the boiling water pipeline;

the starting end of the warm water loop is connected between the first temperature sensor and the first electromagnetic valve, the terminating end of the warm water loop is connected between the first electromagnetic valve and the second temperature sensor and is positioned at one end close to the first electromagnetic valve, and the second electromagnetic valve, the radiator and the fourth electromagnetic valve are sequentially distributed on the warm water loop;

the starting end of the cold water loop is connected between the radiator and the third electromagnetic valve, the terminating end of the cold water loop is connected between the first electromagnetic valve and the second temperature sensor and is positioned at one end close to the second temperature sensor, the third electromagnetic valve and the heat exchanger are sequentially distributed on the cold water loop, the heat exchanger is provided with a hot water inlet, a cold water inlet, a hot water outlet and a cold water outlet, the hot water inlet and the hot water outlet are connected with the cold water loop, the cold water inlet is connected with the concentrated water pipe, and the cold water outlet is connected with the drain pipe;

the water outlet switch comprises a child lock switch, a display module and an input module, the display module is respectively connected with the input module and the PLC system, and the display module can display the input temperature of the input module and the signals output by the PLC system;

the sensor, the first temperature sensor, the second temperature sensor and the input module input signals to the PLC system, and the PLC system is in control connection with the radiator fan motor, the heater and the electromagnetic valves.

Preferably, the method comprises the following steps: the boiling water pipeline and the warm water loop, the warm water loop and the cold water loop, and the cold water loop and the boiling water pipeline are connected by a tee joint.

Preferably, the method comprises the following steps: the sensor is a pressure sensor or a water flow sensor.

Preferably, the method comprises the following steps: the heater heating mode is slowly heating, plays scald preventing function.

Preferably, the method comprises the following steps: the PLC system can judge according to the signal input by the second temperature sensor and output a signal to the radiator fan motor to adjust the wind speed.

Preferably, the method comprises the following steps: and a gas-liquid separation device is arranged between the second temperature sensor and the water outlet switch, and steam is introduced into the heat exchanger through a steam pipeline to be condensed into water which flows out along with the water outlet pipe.

The other technical scheme of the invention is the water temperature control method of the water dispenser, which is characterized by comprising the following steps:

the method includes the steps that firstly, a system is started, and a water dispenser is electrified;

secondly, inputting the required drinking water temperature T1 in the input module;

thirdly, the PLC system judges that the input temperature T1 is less than or equal to 40 ℃, if not, the child lock is required to be unlocked, and if yes, the next step is carried out;

fourthly, turning on a water outlet switch;

fifthly, judging that the input temperature T1 is less than or equal to 40 ℃, if yes, switching to the cold water gear in the step, and if not, switching to the next step;

sixthly, detecting data in the pipe by a sensor and outputting a signal to a PLC system, outputting a pressure signal if the sensor is a pressure sensor, and outputting a flow signal if the sensor is a water flow sensor;

the peace PLC system judges whether the output signal data of the sensor is in a normal value range, if not, the heater stops working, and the PLC system outputs a signal to the display module to display and alarm, if so, the next step is carried out;

and the PLC system judges whether default power parameters exist in the system, if so, the steps of 'hot water gear' and 'cold water gear' are respectively accessed, otherwise, the next step is carried out;

the power of the self-supporting heater is increased, the first temperature sensor senses the temperature rise, and a signal is output to the PLC system;

judging whether the temperature of water in the pure water pipe does not rise within 5s by the PLC system, if not, adjusting the power of the heater, continuing rising, and if so, entering the next step;

setting the stable temperature as the current boiling point temperature T;

setting the default power parameter to be lower than the heater power corresponding to the current boiling point temperature by using the PLC system;

the selection of the boiling water grade;

the first electromagnetic valve is opened, the second electromagnetic valve is closed, the third electromagnetic valve is closed, and the fourth electromagnetic valve is closed;

and (4) discharging water from the water outlet and finishing water receiving.

Preferably, the method comprises the following steps: step fifthly, the temperature control method for the cold water gear further comprises the following steps:

(5.11) the heater is not started;

(5.12) opening the first electromagnetic valve, closing the second electromagnetic valve, closing the third electromagnetic valve and closing the fourth electromagnetic valve;

and (5.13) discharging water from the water outlet in the step (A), and finishing water receiving.

Preferably, the method comprises the following steps: and the temperature control method of the hot water gear (70 ℃ to T1 to 90 ℃) further comprises the following steps:

(8.11) closing the first electromagnetic valve, opening the second electromagnetic valve, closing the third electromagnetic valve and opening the fourth electromagnetic valve;

(8.12) the second temperature sensor detects the water temperature in the water pipe;

(8.13) judging whether the temperature is equal to T1, if so, discharging water to the water outlet of the step natural water, and if not, entering the next step;

(8.14) judging whether the temperature is less than or equal to T1, if so, returning to the step (8.12) through the step of gradually slowing down the working speed of the fan;

(8.15) if not, returning to the step (8.12) through the step of 'the operating speed of the fan is gradually increased'.

Preferably, the method comprises the following steps: the temperature control method of the cold water gear (T1 is more than 40 ℃ and less than or equal to 70 ℃) further comprises the following steps:

(8.21) the first electromagnetic valve is closed, the second electromagnetic valve is opened, the third electromagnetic valve is opened, and the fourth electromagnetic valve is closed;

(8.22) the second temperature sensor detects the water temperature in the water pipe;

(8.23) judging whether the temperature is equal to T1, if so, discharging water to the water outlet of the step natural water, and if not, entering the next step;

(8.24) judging whether the temperature is less than or equal to T1, if so, returning to the step (8.12) through the step of gradually slowing down the working speed of the fan;

and (8.25) if not, returning to the step (8.12) through the step of 'the operating speed of the fan is gradually increased'.

Compared with the prior art, the invention has the beneficial effects that:

the water dispenser disclosed by the invention can obtain fresh drinking water at various temperatures according to different requirements of people.

The invention avoids the use of refrigeration equipment and preheats the inlet water due to the adoption of the heat exchanger, thereby reducing the consumption of electric energy.

According to the water dispenser, the heat exchanger and the radiator are matched at the same time, so that the drinking water in the pipeline can be further cooled.

The heater of the water dispenser of the invention uses a slow heating mode to prevent a user from being scalded.

The water dispenser can adjust the controllers through the PLC system according to the data obtained by the sensors, so that the accurate adjustment of the temperature of the drinking water can be realized.

Drawings

FIG. 1 is a schematic structural diagram of a water dispenser of the present invention;

FIG. 2 is a PLC system control schematic diagram of the water dispenser of the present invention;

FIG. 3 is a flow chart of the water temperature control method of the water dispenser of the invention.

The labels in the figure are:

Detailed Description

The invention will be described in more detail below with reference to the accompanying drawings:

referring to fig. 1 and 2, the water dispenser includes a water purifying device 1 and a boiling water pipeline controlled by a PLC system 7, the water purifying device 1 is provided with a raw water pipe 11, a pure water pipe 12 and a concentrated water pipe 13, the boiling water pipeline includes a pure water pipe 11, a first branch hot water pipe 23, a water outlet branch pipe 61 and a water outlet pipe 6, one end of the pure water pipe 12 is connected to a pure water outlet of the water purifying device 1, and the other end is connected to an inlet of a first three-way pipe 55; the outlet of the first tee joint 55 is connected with one end of the first branch hot water pipe 23, and the other end of the first branch hot water pipe 23 is connected with the inlet of the second tee joint 56; the outlet of the second tee joint 56 is connected with one end of a water outlet branch pipe 61, and the other end of the water outlet branch pipe 61 is connected with the inlet of the third tee joint 57; the outlet of the third tee 57 is connected with one end of the water outlet pipe 6;

the warm water loop comprises a second branch hot water pipe 24 and a first branch warm water pipe 32, the turning port of the first tee joint 55 is connected with one end of the second branch hot water pipe 24, and the other end of the second branch hot water pipe 24 is connected with the inlet of the fourth tee joint 58; the turning port of the fourth tee 58 is connected with one end of the first branch warm water pipe 32, and the other end of the fourth tee 56 is connected with the turning port of the second tee 56 and is converged with the boiling water pipe to form a loop;

the cold water loop comprises a second branch warm water pipe 33 and a cold water pipe 41, one end of the second branch warm water pipe 33 is connected with an outlet of the fourth tee 58, the other end of the second branch warm water pipe is connected with a hot water inlet of the heat exchanger 3, a hot water outlet of the heat exchanger 3 is connected with one end of the cold water pipe 41, and the other end of the cold water pipe 41 is connected with a steering port of the third tee 57 and converged with a boiling water pipeline to form a loop;

the heat exchanger 3 is also provided with a cold water inlet and a cold water outlet, the cold water inlet is connected with the concentrated water pipe 13, the cold water outlet is connected with the drain pipe 42, and the drain pipe 42 discharges the concentrated water subjected to heat exchange in the heat exchanger 3;

the pure water pipe 12 is provided with a heater 2, the sensor 21 is arranged in front of the inlet of the heater 2, and the first temperature sensor 22 is arranged at the outlet of the heater 2; a second temperature sensor 62 is arranged on the water outlet pipe 6 and is positioned in front of the water outlet switch 63; a first electromagnetic valve 51 is distributed on the first branch hot water pipe 23; the second branch hot water pipe 24 is sequentially provided with a second electromagnetic valve 52 and a radiator 3; a fourth electromagnetic valve 54 is distributed on the first branch warm water pipe 32; the second branch warm water pipe 33 is provided with a third electromagnetic valve 53 and is positioned in front of the heat exchanger 4.

And a gas-liquid separation device 64 is arranged on the water outlet pipe 6 and between the second temperature sensor 62 and the water outlet switch 63, when drinking water flows through the water outlet pipe 6, the gas-liquid separation device 64 separates steam from the drinking water, and the steam is introduced into the heat exchanger 4 from the steam pipeline 641 and condensed into water to be discharged from the water outlet pipe 42.

The sensor 21, the first temperature sensor 22 and the second temperature sensor 62 are all connected with the PLC system 7, and the PLC system 7 is in control connection with the radiator fan motor 31, the heater 2, and the first electromagnetic valve 51, the second electromagnetic valve 52, the third electromagnetic valve 53 and the fourth electromagnetic valve 54 which control the water flow direction of the pipeline;

the water outlet switch 63 comprises a child lock switch, an input module 631 and a display module 632, wherein the input module 631 and the display module 632 are connected with each other and are respectively connected with the PLC system 7.

Referring to fig. 3, the water temperature control method of the water dispenser includes the following steps:

the method includes the steps that firstly, a system is started, and a water dispenser is electrified;

secondly, inputting the required drinking water temperature T1 in the input module 631;

thirdly, the PLC system 7 judges that the input temperature T1 is less than or equal to 40 ℃, if not, the child lock is required to be unlocked, and if yes, the next step is carried out;

fourthly, turning on a water outlet switch 63;

fifthly, judging that the input temperature T1 is less than or equal to 40 ℃, if yes, switching to the cold water gear in the step, and if not, switching to the next step;

sixthly, detecting data in the pipe by the sensor 21 and outputting a signal to the PLC system 7, if the sensor 21 is a pressure sensor, outputting a pressure signal, and if the sensor 21 is a water flow sensor, outputting a flow signal;

the PLC system 7 judges whether the signal data output by the sensor 21 is in a normal value range, if not, the heater 2 stops working, and if so, the PLC system 7 outputs a signal to the display module 632 to display an alarm, and if so, the next step is carried out;

and the PLC system 7 judges whether default power parameters exist in the system, if so, the steps of 'hot water gear' and 'cold water gear' are respectively accessed, and if not, the next step is carried out;

the power of the self-supporting heater 2 is increased, the first temperature sensor 22 senses the temperature rise, and a signal is output to the PLC system 7;

the PLC system 7 judges whether the temperature of the water in the pure water pipe 12 does not rise within 5s, if not, the power of the heater 2 is adjusted, the water continues to rise, and if yes, the next step is carried out;

setting the stable temperature as the current boiling point temperature T;

setting the default power parameter to be lower than the power of the heater 2 corresponding to the current boiling point temperature by the water pumping PLC system 7;

the selection of the boiling water grade;

first generating a state in which the first solenoid valve 51 is opened, the second solenoid valve 52 is closed, the third solenoid valve 53 is closed, and the fourth solenoid valve 54 is closed;

and (4) discharging water from the water outlet and finishing water receiving.

In this embodiment, the method for controlling the temperature of the cold water stage further includes:

(5.11) the heater 2 is not started;

(5.12) the first solenoid valve 51 is opened, the second solenoid valve 52 is closed, the third solenoid valve 53 is closed, and the fourth solenoid valve 54 is closed;

and (5.13) discharging water from the water outlet in the step (A), and finishing water receiving.

In this embodiment, the step of the temperature control method for the hot water level (T1 ≤ 70 ℃ > 90 ℃) further includes:

(8.11) the first solenoid valve 51 is closed, the second solenoid valve 52 is opened, the third solenoid valve 53 is closed, and the fourth solenoid valve 54 is opened;

(8.12) the second temperature sensor 62 detects the temperature of the water in the water pipe 6;

(8.13) judging whether the temperature is equal to T1, if so, discharging water to the water outlet of the step natural water, and if not, entering the next step;

(8.14) judging whether the temperature is less than or equal to T1, if so, returning to the step (8.12) through the step of gradually slowing down the working speed of the fan;

(8.15) if not, returning to the step (8.12) through the step of 'the operating speed of the fan is gradually increased'.

In this embodiment, the temperature control method for the cold water level (T1 is greater than 40 ℃ and less than or equal to 70 ℃) further includes:

(8.21) the first solenoid valve 51 is closed, the second solenoid valve 52 is opened, the third solenoid valve 53 is opened, and the fourth solenoid valve 54 is closed;

(8.22) the second temperature sensor 62 detects the temperature of the water in the water pipe 6;

(8.23) judging whether the temperature is equal to T1, if so, discharging water to the water outlet of the step natural water, and if not, entering the next step;

(8.24) judging whether the temperature is less than or equal to T1, if so, returning to the step (8.12) through the step of gradually slowing down the working speed of the fan;

and (8.25) if not, returning to the step (8.12) through the step of 'the operating speed of the fan is gradually increased'.

The specific use process is as follows:

when the drinking water needs to be connected, the required temperature is input, if the input temperature is higher than 40 ℃, the child lock switch needs to be unlocked, then the water outlet switch 63 is opened, and if the input temperature is lower than or equal to 40 ℃, the water outlet switch 63 can be directly opened:

when the input temperature of the input module 631 is 98 ℃, the PLC system 7 controls the first solenoid valve 51 to open, the second solenoid valve 52, the third solenoid valve 53 and the fourth solenoid valve 54 to close, and the drinking water is heated to the local boiling point by the heater 2 and then directly flows into the water cup 8 through the first branch hot water pipe 23, the water outlet branch pipe 61 and the water outlet pipe 6;

when the input temperature of the input module 631 is 90 ℃, the PLC system 7 controls the second solenoid valve 52 and the fourth solenoid valve 54 to open, the first solenoid valve 51 and the third solenoid valve 53 to close, the radiator fan motor 31 is not started, and the drinking water is heated by the heater 2 to the local boiling point and then directly flows into the water cup 8 through the second branch hot water pipe 24, the radiator 3, the first branch warm water pipe 32, the water outlet branch pipe 61 and the water outlet pipe 6;

when the input temperature of the input module 631 is greater than 70 ℃ and less than 90 ℃, the PLC system 7 controls the second solenoid valve 52 and the fourth solenoid valve to open 54, the first solenoid valve 51 and the third solenoid valve 53 are closed, the radiator fan motor 31 is started, and the lower the input temperature is, the faster the fan speed is, the more the drinking water is heated to the local boiling point by the heater 2, flows into the radiator 3 through the second branch hot water pipe 24 to be cooled, and then flows into the water cup 8 through the first branch warm water pipe 32, the water outlet branch pipe 61 and the water outlet pipe 6;

when the input temperature of the input module 631 is 70 ℃, the PLC system 7 controls the second solenoid valve 52 and the third solenoid valve to open 53, the first solenoid valve 51 and the fourth solenoid valve 54 to close, the radiator fan motor 31 is not started, and the drinking water is heated by the heater 2 to the local boiling point, flows into the radiator 3 through the second branch hot water pipe 24, flows into the heat exchanger 4 through the second branch warm water pipe 33 to exchange heat with the water in the cold water pipe, and flows into the drinking cup 8 along the cold water pipe 41 and the water outlet pipe 6;

when the input temperature of the input module 631 is higher than 40 ℃ and lower than 70 ℃, the PLC system 7 controls the second solenoid valve 52 and the third solenoid valve to open 53, the first solenoid valve 51 and the fourth solenoid valve 54 to close, the radiator fan motor 31 is started and the fan speed is faster as the input temperature is lower, the drinking water is heated to the local boiling point by the heater 2, then flows into the radiator 3 through the second branch hot water pipe 24 to be cooled, then flows into the heat exchanger 7 through the second branch warm water pipe 33 to exchange heat with the water in the cold water pipe, and then flows into the water cup 8 along the cold water pipe 41 and the water outlet pipe 6;

if the input temperature of the input module 631 is less than 40 ℃, the PLC system 7 controls the first solenoid valve 51 to open, the second solenoid valve 52, the third solenoid valve 53 and the fourth solenoid valve 54 to close, the heater is not started, and the drinking water directly flows into the water cup 8 through the first branch hot water pipe 23, the water outlet branch pipe 61 and the water outlet pipe 6;

if the input temperature of the input module 631 is higher than 98 ℃, the PLC system 7 automatically adjusts the input temperature to 98 ℃.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.