A control method for a water return circulation air energy water heater

Abstract

The present invention discloses a control method for a return water circulation air energy water heater. The present invention calculates the maximum hot water demand of the user in the last 30 days through a water flow sensor and an upper water temperature sensor, and adjusts the maximum water temperature of the water heater according to the hot water demand to achieve the best energy saving effect. The voice control method detects and captures the customer's language, reads and translates the user's need for hot water, and starts the circulation pump in advance to reduce heat loss. An ambient temperature probe is set to prevent the water pipe from freezing and cracking at low temperatures.

Description

Technical field:

[0002] The invention relates to a control method for a return water circulation air energy water heater. Background technology:

[0004] At present, the water tank capacity of air-energy water heaters is generally large, and they are mostly used in large houses and villas. Because the hot water pipelines in large houses are long and complicated, and the water heaters are far away from the water point, when users turn on the hot water tap, they need to wait for a long time to experience hot water.

[0005] At present, the heat pump water heaters on the market are basically equipped with a return water circulation pump to reduce the waiting time for hot water. The main control method of the return water pump is timing and temperature setting, that is, the circulation pump keeps running during the timing period, or a certain water pipe temperature is set. When the return water pipe temperature is lower than the set value, the circulation pump keeps running.

[0006] Although the above two operation modes can reduce the waiting time for hot water, the heat loss is very large because the circulating pump is always running and the heat dissipation of the pipe is serious, especially in winter. Therefore, there is an urgent need for a heat pump water heater return water device and control method that can satisfy customers' instant heating and achieve real energy saving, so that the circulating pump is only turned on before the customer needs to use hot water, and the circulating pump is not turned on when the user does not need to use hot water. Summary of the invention:

[0008] The present invention provides a control method for a return water circulation air energy water heater in order to solve the problems existing in the above-mentioned prior art.

[0009] The technical solutions adopted in the present invention are:

[0010] A control method for a return water circulation air energy water heater,

[0011] 1) Arrangement of pipelines and sensors:

[0012] The water outlet of the air energy water tank is connected to the water outlet main pipe, the water outlet main pipe is connected to the return pipe, the return pipe is connected to the water inlet of the air energy water tank, a return pipe water temperature sensor, a second water flow sensor and a return pump are arranged in sequence along the water flow direction on the return pipe, a control module is connected to the return pump, a storage module and a sound reading module are connected to the control module, a plurality of user branches are connected to the water outlet main pipe, and two upper water temperature sensors and a lower water temperature sensor arranged up and down are arranged in the air energy water tank;

[0013] 2) Get the user's maximum hot water demand in the last 30 days:

[0014] Set the initial heating temperature of the air energy water tank, detect the user's full-day hot water usage according to the first water flow sensor, and continuously store 30 days of hot water usage data; retrieve the hot water usage data of the most used ten days in the 30 days of hot water usage data, and then take the average value of the ten days as the maximum hot water usage to increase or decrease the initial heating temperature of the air energy water tank;

[0015] 3) Start and stop logic setting of return water pump:

[0016] When the second water flow sensor detects the water flow in the return pipe, it determines whether the temperature value of the upper water temperature sensor in the air energy water tank is greater than the set temperature. If it is greater than the set temperature, the return pump is started; if it is less than the set temperature, the return pump is not started;

[0017] When the return water pipe water temperature sensor detects that the water temperature in the return water pipe is greater than the set temperature, the return water pump stops running;

[0018] 4) Voice reading: The target information is pre-stored in the storage module. After the voice reading module obtains the target information spoken by the user, the return water pump is turned on and off according to the start and stop logic set above.

[0019] 4) Voice reading: The target information is pre-stored in the storage module. After the voice reading module obtains the target information spoken by the user, the return water pump is turned on and off according to the start and stop logic set above.

[0020] Furthermore, the control module is also connected to an ambient temperature probe. When the water temperature sensor of the return pipe is damaged and the ambient temperature probe detects that the ambient temperature is lower than 0°C, the return pump automatically circulates once every 5 minutes.

[0021] Furthermore, when the return pipe water temperature sensor and the ambient temperature probe are damaged at the same time, the return pump remains turned on.

[0022] Furthermore, the initial heating temperature of the air energy water tank is set to 50-60°C; the initial heating temperature of the air energy water tank is increased or decreased according to the average value of ten days as the maximum hot water consumption, and the amplitude of each increase or decrease is ±5°C.

[0023] Furthermore, the installation height of the upper water temperature sensor is flush with or higher than the height of the water outlet of the air energy water tank.

[0024] Furthermore, when the temperature value of the upper water temperature sensor in the air energy water tank is greater than 40°C, the return water pump is started; when the return water pipe water temperature sensor detects that the water temperature value in the return water pipe is greater than 38°C, the return water pump stops running.

[0025] Furthermore, a one-way pressure relief valve is provided on the return water pipe and downstream of the return water pump.

[0026] The present invention has the following beneficial effects:

[0027] 1) As the temperature of the heated water increases, the energy-saving effect of the air-energy water heater decreases. This heat pump water heater calculates the user's maximum hot water demand in the past 30 days through the water flow sensor and the upper water temperature sensor, and adjusts the maximum water temperature of the water heater according to the hot water demand to achieve the best energy-saving effect.

[0028] 2) Detect and capture the customer's language through voice control, read and translate the user's need for hot water, start the circulation pump in advance, and reduce heat loss.

[0029] 3) Install an ambient temperature probe to prevent water pipes from freezing and cracking in low temperatures. Description of the drawings:

[0031] FIG. 1 is a schematic diagram of the pipeline connection of the present invention.

[0032] FIG. 2 is a schematic diagram showing the connection between the control module, the storage module and the sound reading module. Specific implementation method:

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] like Figure 1 and Figure 2 The present invention provides a control method for a return water circulation air energy water heater.

[0036] 1) Arrangement of pipelines and sensors:

[0037] The water outlet of the air energy water tank 1 is connected to the water outlet main pipe 2, the water outlet main pipe 2 is connected to the return pipe 3, the return pipe 3 is connected to the water inlet of the air energy water tank 1, and a return pipe water temperature sensor 73, a second water flow sensor 62, a return pump 4 and a one-way pressure relief valve 8 are arranged in sequence along the water flow direction on the return pipe 3, a control module is connected to the return pump 4, a storage module and a sound reading module are connected to the control module, a plurality of user branch pipes 5 are connected to the water outlet main pipe 2, and two upper water temperature sensors 71 and lower water temperature sensors 72 arranged up and down are provided in the air energy water tank 1, wherein the installation height of the upper water temperature sensor 71 is flush with or higher than the height of the water outlet of the air energy water tank 1.

[0038] 2) Get the user's maximum hot water demand in the last 30 days:

[0039] The initial heating temperature of the air energy water tank 1 is set to meet daily needs, generally 50-60°C. The user's full-day hot water usage is detected by the first water flow sensor 61, and the hot water usage data for 30 days is continuously stored; the hot water usage data of the most used ten days in the stored 30-day hot water usage data is retrieved, and then the average value of the ten days is taken as the maximum hot water usage to increase or decrease the initial heating temperature of the air energy water tank 1, and the range of each increase or decrease is ±5°C.

[0040] The present invention sets the heating water temperature of the air energy water tank 1 by calling the average of the hot water usage in the maximum ten days of each month, so that the water heater has the best energy saving performance and avoids heat waste. For example, the user initially sets the heating water temperature of the air energy water tank 1 to 50°C, but when in use, more than ten days in a month are above 50°C. At this time, the air energy water tank 1 is in an uninterrupted heating process, which is not energy-saving. At this time, it needs to be increased by 5°C, and then gradually adjusted according to the data of the next 30 days, and slowly adjusted to the most suitable temperature.

[0041] Alternatively, if the user sets the heating water temperature of the air energy water tank 1 to 70°C, but in daily use, a large amount of water may be used once or twice occasionally, and if the air energy water tank 1 is kept at 70°C for a long time, it will cause heat energy waste. At this time, it is necessary to reduce 5°C, and then gradually adjust it according to the data of the next 30 days, and slowly adjust it to the most suitable temperature.

[0042] Therefore, the present invention adopts the average value of the maximum usage to adjust the heating water temperature of the air energy water tank 1, so that the energy saving performance of the water heater is optimized.

[0043] 3) Start and stop logic setting of return water pump 4:

[0044] (1) When the second water flow sensor 62 detects that water flows through the return pipe 3 and determines that the temperature value of the upper water temperature sensor 71 in the air energy water tank 1 is greater than the set temperature, the return pump 4 is started; when the temperature is less than the set temperature, the return pump 4 is not started. The specific set temperature is set according to user needs. The set temperature of the upper water temperature sensor 71 given in this embodiment is 40°C.

[0045] The purpose of such arrangement is that if the water temperature in the air energy water tank 1 is lower than 40°C, if the return water pump 4 is forced to be turned on for water circulation, the water in the air energy water tank 1 itself needs to be heated, and hot water needs to be provided to the water pipes for heating, thus causing energy waste.

[0046] (2) When the return pipe water temperature sensor 73 detects that the water temperature of the return pipe 3 is greater than 38°C, the return pump 4 stops running. Monitoring the water temperature of the return pipe 3 to shut down the return pump 4 will cause heat energy waste.

[0047] 4) Sound reading: After the start and stop logic of the return water pump 4 is set, whether the return water pump 4 is working is activated by external sound information. Specifically, the target information is pre-stored in the storage module. When in use, after the sound reading module obtains the target information spoken by the user, the return water pump 4 is turned on and off according to the set start and stop logic.

[0048] The pre-stored target information can be "bathing, washing hands, washing vegetables, washing dishes, washing dishes", etc. In daily life, for example, if the owner says "I will take a bath later / prepare to take a bath", "I want to take a bath", "wash the vegetables", etc., after the sound reading module obtains such target information, the return pump 4 starts, so that the user has hot water available when performing the corresponding behavior (such as bathing, washing vegetables), so that the user experience is better. The target information can be set according to actual needs, or directly shout information such as "take a bath / cook in five minutes" to the sound reading module, and the return pump 4 will be turned on and off according to the set start-stop logic.

[0049] The present invention also has an ambient temperature probe connected to the control module. When the return pipe water temperature sensor 73 is damaged and the ambient temperature probe detects that the ambient temperature is lower than 0°C, the return pump 4 automatically circulates once every 5 minutes to prevent the return pipe 3 from freezing and cracking.

[0050] In addition, a control logic is added. When the water temperature sensor 73 and the ambient temperature probe in the return pipe are damaged at the same time, an alarm sounds and the return pump 4 remains turned on to avoid freezing and cracking and ensure the user experience.

[0051] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A control method for a return water circulation air energy water heater, characterized in that: 1) Arrangement of pipelines and sensors: The water outlet of the air energy water tank (1) is connected to a water outlet main pipe (2), the water outlet main pipe (2) is connected to a water return pipe (3), the water return pipe (3) is connected to a water inlet of the air energy water tank (1), a water return pipe water temperature sensor (73), a second water flow sensor (62) and a water return pump (4) are arranged in sequence along the water flow direction on the water return pipe (3), a control module is connected to the water return pump (4), a storage module and a sound reading module are connected to the control module, a plurality of user branch pipes (5) are connected to the water outlet main pipe (2), and two upper water temperature sensors (71) and a lower water temperature sensor (72) are arranged in the air energy water tank (1); 2) Get the user's maximum hot water demand in the last 30 days: The initial heating temperature of the air energy water tank (1) is set, the user's daily hot water consumption is detected according to the first water flow sensor (61), and the hot water consumption data for 30 days is continuously stored; the hot water consumption data of the ten most used days in the stored 30 days of hot water consumption data are retrieved, and the average value of the ten days is taken as the maximum hot water consumption to increase or decrease the initial heating temperature of the air energy water tank (1); 3) Start and stop logic setting of return water pump (4): When the second water flow sensor (62) detects water flowing through the return pipe (3), it is determined whether the temperature value of the upper water temperature sensor (71) in the air energy water tank (1) is greater than a set temperature. If the temperature is greater than the set temperature, the return pump (4) is started; if the temperature is less than the set temperature, the return pump (4) is not started; When the return pipe water temperature sensor (73) detects that the water temperature in the return pipe (3) is greater than the set temperature, the return pump (4) stops running; 4) Voice reading: The target information is pre-stored in the storage module. After the voice reading module obtains the target information spoken by the user, the return water pump (4) is turned on and off according to the start and stop logic set above.

2. The control method of the return water circulation air energy water heater according to claim 1, characterized in that: The control module is also connected to an ambient temperature probe. When the return water pipe water temperature sensor (73) is damaged and the ambient temperature probe detects that the ambient temperature is lower than 0°C, the return water pump (4) automatically circulates once every 5 minutes.

3. The control method of the return water circulation air energy water heater according to claim 2, characterized in that: When the return pipe water temperature sensor (73) and the ambient temperature probe are damaged at the same time, the return pump (4) remains turned on.

4. The control method of the return water circulation air energy water heater according to claim 1, characterized in that: The initial heating temperature of the air energy water tank (1) is set to 50-60°C; the initial heating temperature of the air energy water tank (1) is increased or decreased based on the average value of ten days as the maximum hot water consumption, and the amplitude of each increase or decrease is ±5°C.

5. The control method of the return water circulation air energy water heater according to claim 1, characterized in that: The installation height of the upper water temperature sensor (71) is flush with or higher than the height of the water outlet of the air energy water tank (1).

6. The control method of the return water circulation air energy water heater according to claim 1, characterized in that: When the temperature value of the upper water temperature sensor (71) in the air energy water tank (1) is greater than 40°C, the return water pump (4) is started; when the return water pipe water temperature sensor (73) detects that the water temperature value in the return water pipe (3) is greater than 38°C, the return water pump (4) stops running.

7. The control method of the return water circulation air energy water heater according to claim 1, characterized in that: A one-way pressure relief valve (8) is provided on the water return pipe (3) and downstream of the water return pump (4).

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