Hot water unit, control method and system of hot water unit and storage medium

Abstract

The invention discloses a hot water unit, a control method and system of the hot water unit and a storage medium, and relates to the field of water heaters, the hot water unit comprises a heating host, a pressure-bearing water tank, a water pump, a valve body, a first temperature sensor and a second temperature sensor; the heating main machine comprises a main water tank and a heating device; the valve body is arranged between the water outlet of the main water tank and the second water port of the pressure-bearing water tank or the third water port of the pressure-bearing water tank; the heating device is used for heating liquid in the main water tank and / or the pressure-bearing water tank and adjusting the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor. The working state of the heating device and the operation strategy of the water pump are adjusted in real time by detecting temperature data, energy-saving operation can be achieved, and the safety of the unit is improved.

Description

Technical Field

[0001] The present invention relates to the field of water heaters, and in particular to a water heater unit, a control method, a system and a storage medium for the water heater unit. Background Art

[0002] In commercial water heater systems, open tanks are widely used due to their ease of installation, ease of expansion and low cost. However, open tanks are open to the atmosphere and are susceptible to the intrusion of dust and impurities, which can lead to deterioration of water quality, especially in the open part of the tank that is in contact with the atmosphere. Since open tanks cannot withstand high pressure, they usually need to rely on a water supply pump to supply water. This means that the system may require more complex pumping and piping design to ensure that water can be effectively delivered even without sufficient static pressure. Summary of the invention

[0003] The main purpose of the present invention is to provide a hot water unit, a control method, a system and a storage medium for the hot water unit, which facilitates the expansion and upgrading of the unit through the modular design of the heating host, the pressure water tank and the water pump. Through the intelligent control of the valve body, the water flow path is dynamically adjusted to ensure that hot water can be supplied quickly and evenly, reducing water temperature fluctuations and waiting time. By detecting temperature data and adjusting the working state of the heating device and the operation strategy of the water pump in real time, energy-saving operation can be achieved, and the safety of the unit is improved.

[0004] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions: According to a first aspect of an embodiment of the present application, a hot water unit is provided, comprising a heating host, a pressure water tank, a water pump, a valve body, a first temperature sensor and a second temperature sensor; the heating host comprises a main water tank and a heating device; the water inlet of the main water tank is connected to the first water inlet of the pressure water tank, and the water outlet of the main water tank is connected to the second water inlet of the pressure water tank; The water pump is arranged between the water inlet of the main water tank and the first water inlet of the pressure water tank; The valve body is arranged between the water outlet of the main water tank and the second water outlet of the pressure water tank or the third water outlet of the pressure water tank; The first temperature sensor is located in the main water tank, and the second temperature sensor is located in the pressure water tank and close to the second water inlet of the pressure water tank; The heating device is used to heat the liquid in the main water tank and / or the pressure water tank, and adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0005] Optionally, there are multiple pressure water tanks, which are connected in cascade, and the multiple pressure water tanks include a first-stage pressure water tank and a second-stage pressure water tank, the first-stage pressure water tank is a pressure water tank far away from the main water tank in the water flow path among the multiple pressure water tanks, and the second-stage pressure water tank is a pressure water tank close to the main water tank in the water flow path among the multiple pressure water tanks; the second water inlet of the first-stage pressure water tank is connected to the first water inlet of the second-stage pressure water tank; The water inlet of the main water tank is connected to the first water outlet of the first-stage pressure water tank, the water outlet of the main water tank is connected to the second water outlet of the second-stage pressure water tank, and the second water outlet of the second-stage pressure water tank is connected to the drain pipe.

[0006] Optionally, the valve body is a three-way valve arranged between the water outlet of the main water tank and the second water outlet of the pressure water tank; The first end of the three-way valve is connected to the water outlet of the main water tank, the second end of the three-way valve is connected to the second water inlet of the pressure water tank, and the third end of the three-way valve is connected to the third water inlet of the pressure water tank. The third water inlet of the pressure water tank is located between the first water inlet and the second water inlet of the pressure water tank. The three-way valve is used to connect the water outlet of the main water tank with the third water inlet of the pressure water tank when the power is on, and to connect the water outlet of the main water tank with the second water inlet of the pressure water tank when the power is off.

[0007] Optionally, the valve body is a first two-way valve and a second two-way valve; The first end of the first two-way valve is connected to the water outlet of the main water tank, and the second end of the first two-way valve is connected to the second water outlet of the pressure water tank; the first end of the second two-way valve is connected to the water outlet of the main water tank, and the second end of the second two-way valve is connected to the third water outlet of the pressure water tank; The first two-way valve and the second two-way valve are selectively energized, so that the water outlet of the main water tank is selectively connected to the second water outlet of the pressure water tank or the third water outlet of the pressure water tank.

[0008] Optionally, the first water inlet and the second water inlet of the pressure water tank are respectively located at two ends of the pressure water tank; the first water inlet of the pressure water tank is located below the second water inlet along the direction of gravity; the fourth water inlet of the pressure water tank is used to connect to a water supply pipe, and the second water inlet of the pressure water tank is used to connect to a drain pipe.

[0009] According to a second aspect of an embodiment of the present application, a water heater control method is provided, which is applied to the water heater described in the first aspect, and the method includes: Turning on the water pump according to the temperature detected by the second temperature sensor being lower than the first preset temperature; After the water pump is started for a set time, and according to the temperature detected by the first temperature sensor being lower than the first preset temperature, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank; The water flow control strategy of the valve body is adjusted in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0010] Optionally, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank comprises: Controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank until the temperature detected by the first temperature sensor reaches a second preset temperature; After reaching the second preset temperature, if the temperature detected by the first temperature sensor continues to rise until reaching the third preset temperature, the heating device is controlled to stop heating; wherein the second preset temperature is greater than the first preset temperature, and the third preset temperature is greater than the second preset temperature.

[0011] Optionally, the water flow control strategy of adjusting the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor includes: acquiring in real time a first liquid temperature detected by the first temperature sensor, a second liquid temperature detected by the second temperature sensor, and a control parameter of the valve body, wherein the control parameter of the valve body includes an opening of a three-way valve, or an opening of a first two-way valve and an opening of a second two-way valve; According to the deviation between the first liquid temperature and the second liquid temperature and a set target temperature range, the control parameter of the valve body is adjusted in real time.

[0012] According to a third aspect of an embodiment of the present application, a method for controlling a water heater unit is provided, which is applied to the water heater unit described in the first aspect, and the method includes: Turning on the water pump according to the temperature detected by the second temperature sensor being lower than the first preset temperature; According to the temperature detected by the first temperature sensor being lower than the first preset temperature, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank; The water flow control strategy of the valve body is adjusted in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0013] Optionally, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank comprises: Controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank until the temperature detected by the first temperature sensor reaches a second preset temperature; After reaching the second preset temperature, if the temperature detected by the first temperature sensor continues to rise until reaching the third preset temperature, the heating device is controlled to stop heating; wherein the second preset temperature is greater than the first preset temperature, and the third preset temperature is greater than the second preset temperature.

[0014] Optionally, the water flow control strategy of adjusting the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor includes: acquiring in real time a first liquid temperature detected by the first temperature sensor, a second liquid temperature detected by the second temperature sensor, and a control parameter of the valve body, wherein the control parameter of the valve body includes an opening of a three-way valve, or an opening of a first two-way valve and an opening of a second two-way valve; According to the deviation between the first liquid temperature and the second liquid temperature and a set target temperature range, the control parameter of the valve body is adjusted in real time.

[0015] According to a fourth aspect of the embodiment of the present application, a water heater control system is provided, which is applied to the water heater described in the first aspect, and the system includes: A water pump control module, configured to start the water pump according to the temperature detected by the second temperature sensor being lower than a first preset temperature; A heating control module, configured to control the heating device to heat the liquid in the main water tank and / or the pressure water tank according to the temperature detected by the first temperature sensor being lower than the first preset temperature after the water pump is started for a set time; The water flow control module is used to adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0016] According to a fifth aspect of an embodiment of the present application, a water heater control system is provided, which is applied to the water heater described in the first aspect, and the system includes: A water pump control module, configured to start the water pump according to the temperature detected by the second temperature sensor being lower than a first preset temperature; A heating control module, configured to control the heating device to heat the liquid in the main water tank and / or the pressure water tank according to the temperature detected by the first temperature sensor being lower than the first preset temperature; The water flow control module is used to adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0017] According to a sixth aspect of an embodiment of the present application, a control module of a water heater is provided, which is applied to the water heater described in the first aspect, and the control module is used to execute the control method described in the second aspect and / or the third aspect.

[0018] According to the seventh aspect of the embodiments of the present application, an electronic device is provided, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the second aspect and / or the third aspect above.

[0019] According to an eighth aspect of an embodiment of the present application, a hot water unit system is provided, comprising the hot water unit described in the first aspect, and also comprising the control module described in the sixth aspect or the electronic device described in the seventh aspect.

[0020] According to the tenth aspect of the embodiments of the present application, a computer-readable storage medium is provided, on which computer-readable instructions are stored. The computer-readable instructions can be executed by a processor to implement the method described in the second aspect and / or the third aspect above.

[0021] In summary, the embodiments of the present application provide a hot water unit, a control method, a system and a storage medium for the hot water unit, wherein the hot water unit includes a heating host, a pressure water tank, a water pump, a valve body, a first temperature sensor and a second temperature sensor; the heating host includes a main water tank and a heating device; the water inlet of the main water tank is connected to the first water outlet of the pressure water tank, and the water outlet of the main water tank is connected to the second water outlet of the pressure water tank; the water pump is arranged between the water inlet of the main water tank and the first water outlet of the pressure water tank; the valve body is arranged between the water outlet of the main water tank and the second water outlet of the pressure water tank or the third water outlet of the pressure water tank; the first temperature sensor is located in the main water tank, and the second temperature sensor is located in the pressure water tank and close to the second water outlet of the pressure water tank; the heating device is used to heat the liquid in the main water tank and / or the pressure water tank, and adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor. The modular design of the heating unit, pressure water tank and water pump facilitates the expansion and upgrade of the unit. Through the intelligent control of the valve body, the water flow path is dynamically adjusted to ensure that hot water can be supplied quickly and evenly, reducing water temperature fluctuations and waiting time. By detecting temperature data and adjusting the working status of the heating device and the operation strategy of the water pump in real time, energy-saving operation can be achieved and the safety of the unit can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0024] Figure 1 A schematic diagram of a water heater unit provided in an embodiment of the present application; Figure 2 A structural diagram of another water heater unit provided in an embodiment of the present application; Figure 3 A structural diagram of another water heater unit provided in an embodiment of the present application; Figure 4 A schematic diagram of a control flow of a hot water unit provided in an embodiment of the present application; Figure 5 Another schematic diagram of a hot water unit control process provided in an embodiment of the present application; Figure 6 A schematic diagram of the overall control process provided for an embodiment of the present application; Figure 7 A block diagram of a hot water unit control system provided in an embodiment of the present application; Figure 8 Another block diagram of a water heater control system provided in an embodiment of the present application; Fig. 9 A structural diagram of an electronic device provided in an embodiment of the present application is shown; Fig.10 A diagram showing a computer-readable storage medium provided by an embodiment of the present application.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] Figure 1 A hot water unit provided in an embodiment of the present application is shown, comprising a heating host, a pressure water tank, a water pump, a valve body, a first temperature sensor and a second temperature sensor; the heating host comprises a main water tank and a heating device; The water inlet of the main water tank is connected to the first water inlet of the pressure water tank, and the water outlet of the main water tank is connected to the second water inlet of the pressure water tank; the water pump is arranged between the water inlet of the main water tank and the first water inlet of the pressure water tank; the valve body is arranged between the water outlet of the main water tank and the second water inlet of the pressure water tank or the third water inlet of the pressure water tank; the first temperature sensor is located in the main water tank, and the second temperature sensor is located in the pressure water tank and close to the second water inlet of the pressure water tank; the heating device is used to heat the liquid in the main water tank and / or the pressure water tank, and adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0032] In a possible embodiment, there are multiple pressure water tanks, which are connected in cascade, and the multiple pressure water tanks include a first-stage pressure water tank and a second-stage pressure water tank, the first-stage pressure water tank is a pressure water tank far away from the main water tank in the water flow path among the multiple pressure water tanks, and the second-stage pressure water tank is a pressure water tank close to the main water tank in the water flow path among the multiple pressure water tanks; the second water inlet of the first-stage pressure water tank is connected to the first water inlet of the second-stage pressure water tank; the water inlet of the main water tank is connected to the first water inlet of the first-stage pressure water tank, the water outlet of the main water tank is connected to the second water inlet of the second-stage pressure water tank, and the second water inlet of the second-stage pressure water tank is connected to a drain pipe.

[0033] Multiple pressure water tanks can be set up and connected in cascade. The water will first pass through the first-stage pressure water tank (the one farthest from the main water tank) and then flow to the second-stage pressure water tank (the one closest to the main water tank).

[0034] The water heater unit may also include a three-way valve and a two-way valve, which are used to control the direction of water flow. For example, the three-way valve can connect the water outlet of the main water tank to the third water outlet of the pressure water tank when the power is on, and connect to the second water outlet when the power is off, so that different water flow paths are selected in different usage scenarios.

[0035] In a possible embodiment, the valve body is a three-way valve arranged between the water outlet of the main water tank and the second water outlet of the pressure water tank; the first end of the three-way valve is connected to the water outlet of the main water tank, the second end of the three-way valve is connected to the second water outlet of the pressure water tank, and the third end of the three-way valve is connected to the third water outlet of the pressure water tank. The third water outlet of the pressure water tank is located between the first water outlet and the second water outlet of the pressure water tank. The three-way valve is used to connect the water outlet of the main water tank with the third water outlet of the pressure water tank when the power is on, and to connect the water outlet of the main water tank with the second water outlet of the pressure water tank when the power is off.

[0036] In a possible embodiment, the valve body is a first two-way valve and a second two-way valve; the first end of the first two-way valve is connected to the water outlet of the main water tank, and the second end of the first two-way valve is connected to the second water inlet of the pressure water tank; the first end of the second two-way valve is connected to the water outlet of the main water tank, and the second end of the second two-way valve is connected to the third water inlet of the pressure water tank; the first two-way valve and the second two-way valve are selectively energized so that the water outlet of the main water tank is selectively connected to the second water inlet of the pressure water tank or the third water inlet of the pressure water tank.

[0037] In a possible implementation manner, the first water inlet and the second water inlet of the pressure water tank are respectively located at two ends of the pressure water tank.

[0038] In a possible implementation, the first water inlet of the pressure water tank is located below the second water inlet along the direction of gravity.

[0039] In a possible implementation manner, the fourth water inlet of the pressure water tank is used to be connected to a water supply pipe, and the second water inlet of the pressure water tank is used to be connected to a drainage pipe.

[0040] The design of the water inlet of the pressure water tank is also considered. For example, the first and second water inlets may be located at both ends of the water tank, or the first water inlet may be located below the second water inlet in the direction of gravity, which is conducive to the flow of water and the efficiency of the system. The fourth water inlet of the pressure water tank is used to connect to the water supply pipe, while the second water inlet is used to connect to the drainage pipe, so that new water can be added and waste water can be discharged conveniently.

[0041] Designed with efficiency, flexibility, and practicality in mind, this water heater unit is ideal for environments that require a steady supply of hot water, such as residences, commercial buildings, or industrial facilities.

[0042] In summary, the hot water unit provided in the embodiment of the present application adopts a closed pressure water tank design to avoid pollution while ensuring the stability of the system pressure, and utilizes the reasonable structural design of the pressure water tank to promote natural convection and reduce the energy consumption of the water pump. A dual temperature sensor (main water tank temperature, pressure water tank temperature) is used to monitor the system temperature status in real time, and the valve body switches the water flow path according to the temperature data to optimize the heat distribution efficiency; by monitoring the temperature data, the system alarm can be triggered and a protective shutdown can be executed when the abnormal temperature persists. Through the real-time collection and analysis of temperature data, the heating device and the water pump always work in the best state, which not only minimizes energy consumption, but also ensures the safety and reliability of equipment operation.

[0043] The water heater and control method provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0044] Figure 2The schematic diagram of the hot water unit structure is shown, which includes: a heating main unit, five cascade-connected pressure water tanks, a water pump, a three-way valve, a first temperature sensor (T1) and a second temperature sensor (T5). The heating main unit includes a main water tank and a heating device.

[0045] The pressure water tank is used to store hot water and is installed in the system to ensure the continuity and stability of the hot water supply. The number of water tanks is not less than one, and can be configured according to engineering requirements to achieve stratified heating of hot water. If there are multiple water tanks, they are installed in series. There are five pressure water tanks in the accompanying drawings provided in the embodiment of the present application, but there is no need to be limited to this in actual applications. The five cascade-connected pressure water tanks include a first pressure water tank, a second pressure water tank, a third pressure water tank, a fourth pressure water tank and a fifth pressure water tank. The first pressure water tank is a pressure water tank far away from the main water tank among the multiple pressure water tanks, and the second pressure water tank is a pressure water tank close to the main water tank among the multiple pressure water tanks; and so on.

[0046] The water inlet of the main water tank is connected to the first water inlet of the first pressure water tank, and the water outlet of the main water tank is connected to the second water inlet of the fifth pressure water tank. The second water inlet of the first pressure water tank is connected to the first water inlet of the second pressure water tank, the second water inlet of the second pressure water tank is connected to the first water inlet of the third pressure water tank, the second water inlet of the third pressure water tank is connected to the first water inlet of the fourth pressure water tank, and the second water inlet of the fourth pressure water tank is connected to the first water inlet of the fifth pressure water tank. The fourth water inlet of the first pressure water tank is used to connect to a water supply pipe, and the second water inlet of the fifth pressure water tank is used to connect to a drainage pipe. The first water inlet and the second water inlet of each pressure water tank are respectively located at two ends of the pressure water tank, and the first water inlet of the pressure water tank is located below the second water inlet along the direction of gravity.

[0047] The three-way valve is arranged between the water outlet of the main water tank and the second water outlet of the fifth pressure water tank; the first end of the three-way valve is connected to the water outlet of the main water tank, the second end of the three-way valve is connected to the second water outlet of the fifth pressure water tank, and the third end of the three-way valve is connected to the third water outlet of the first pressure water tank. The third water outlet of the first pressure water tank is located between the first water outlet and the second water outlet of the first pressure water tank. The three-way valve is used to connect the water outlet of the main water tank with the third water outlet of the first pressure water tank when the power is on, and to connect the water outlet of the main water tank with the second water outlet of the fifth pressure water tank when the power is off.

[0048] The second temperature sensor (T5) is located in the first pressure water tank and near the second water inlet, and is used to monitor the water temperature in the water tank to ensure the quality and efficiency of hot water supply. T5 can also be installed on the second or other level water tanks as needed. The first temperature sensor is located in the main water tank. The water pump is arranged between the water inlet of the heating host and the first water inlet of the first pressure water tank, and is used to transport cold water from the water tank to the host for heating. The heating device is used to heat the liquid in the main water tank and / or the pressure water tank.

[0049] During the operation of the hot water unit, based on the temperature detected by the first temperature sensor being lower than the first preset temperature, the heating device is controlled to heat the liquid in the main water tank and / or the five pressure water tanks to a second preset temperature, which is higher than the first preset temperature. Furthermore, based on the temperature detected by the second temperature sensor being lower than the first preset temperature, the water pump is controlled to be turned on, so that the liquid in the first pressure water tank enters the main water tank through the first water inlet of the first pressure water tank, forcing the liquid in the main water tank to flow toward the fifth pressure water tank close to the main water tank. Furthermore, based on the temperature detected by the first temperature sensor being higher than the third preset temperature, the heating device is controlled to stop heating, and the third preset temperature is higher than the second preset temperature.

[0050] The direct heating machine host is used to heat cold water to the required hot water temperature. When operating in winter or low temperature environments, it may encounter frost problems, affecting the normal operation and efficiency of the equipment. The control system built into the host monitors the external ambient temperature and parameters inside the equipment, such as the surface temperature of the evaporator, to determine whether the defrost program needs to be started. When it is detected that the defrost conditions are met, the control system will start the defrost program. At the same time, the control system will instruct the electric three-way valve to open to change the direction of water flow to avoid cold water supply to the user. During the defrost process, the host will stop supplying hot water to the user and use the heat to heat the evaporator to melt the frost on the surface. The opening of the electric three-way valve ensures the direction of water flow during defrosting, and may guide the water to a path that does not affect defrosting. Once the frost on the surface of the evaporator is melted, the control system will detect that the defrost is completed. The control system will then close the electric three-way valve and return to the normal water supply state. After the defrost is completed, the host continues to operate according to the set working mode to provide hot water to the user. The automation of the defrost function ensures the reliability and efficiency of the equipment in low temperature environments and reduces the need for manual intervention.

[0051] In the case of only a three-way valve, the valve body needs to adjust the state of the three-way valve according to the temperature deviation between the main water tank and the pressure water tank to keep the water temperatures of the two water tanks within their respective target temperature ranges. Specifically, it may include: Step 1: The temperature of the liquid in the main water tank is read in real time by the first temperature sensor, and the temperature of the liquid in the pressure water tank is read in real time by the second temperature sensor.

[0052] Step 2: Two independent target temperature ranges are set for the main water tank and the pressure water tank, which are referred to as a first set target temperature range and a second set target temperature range, respectively.

[0053] Step 3: Initialize a PID valve body and adjust the opening of the three-way valve. Calculate the error between the current temperature and the target temperature, and adjust the opening of the three-way valve according to the proportional parameter.

[0054] Step 4: According to the control signal calculated by the PID algorithm, adjust the opening of the three-way valve in real time to keep the liquid temperature in the main water tank and the pressure water tank within the set range: If the actual temperature of the main water tank is lower than the first set target temperature range, increase the opening of the three-way valve to the third water inlet of the pressure water tank to allow more hot water to flow into the pressure water tank, otherwise reduce it. If the actual temperature of the pressure water tank is lower than the second set target temperature range, reduce the opening of the three-way valve to the second water inlet of the pressure water tank to allow more hot water to flow into the pressure water tank, otherwise increase it. If the temperature of any water tank exceeds the set safety threshold, the system will automatically shut down the heating device and may trigger an alarm.

[0055] Figure 3 The schematic diagram of another hot water unit structure provided by the embodiment of the present application is shown, comprising: a heating host, five cascade-connected pressure water tanks, a water pump, a first two-way valve and a second two-way valve, a first temperature sensor (T1) and a second temperature sensor (T5). The heating host comprises a main water tank and a heating device.

[0056] The pressure water tank is used to store hot water and is installed in the system to ensure the continuity and stability of the hot water supply. The number of water tanks is not less than one, and can be configured according to engineering requirements to achieve stratified heating of hot water. If there are multiple water tanks, they are installed in series. There are five pressure water tanks in the accompanying drawings provided in the embodiment of the present application, but there is no need to be limited to this in actual applications. The five cascade-connected pressure water tanks include a first pressure water tank, a second pressure water tank, a third pressure water tank, a fourth pressure water tank and a fifth pressure water tank. The first pressure water tank is a pressure water tank far away from the main water tank among the multiple pressure water tanks, and the second pressure water tank is a pressure water tank close to the main water tank among the multiple pressure water tanks; and so on.

[0057] The water inlet of the main water tank is connected to the first water inlet of the first pressure water tank, and the water outlet of the main water tank is connected to the second water inlet of the fifth pressure water tank. The second water inlet of the first pressure water tank is connected to the first water inlet of the second pressure water tank, the second water inlet of the second pressure water tank is connected to the first water inlet of the third pressure water tank, the second water inlet of the third pressure water tank is connected to the first water inlet of the fourth pressure water tank, and the second water inlet of the fourth pressure water tank is connected to the first water inlet of the fifth pressure water tank. The fourth water inlet of the first pressure water tank is used to connect to a water supply pipe, and the second water inlet of the fifth pressure water tank is used to connect to a drainage pipe. The first water inlet and the second water inlet of each pressure water tank are respectively located at two ends of the pressure water tank, and the first water inlet of the pressure water tank is located below the second water inlet along the direction of gravity.

[0058] The first end of the first two-way valve is connected to the water outlet of the main water tank, and the second end of the first two-way valve is connected to the second water inlet of the fifth pressure water tank; the first end of the second two-way valve is connected to the water outlet of the main water tank, and the second end of the second two-way valve is connected to the third water inlet of the first pressure water tank; the first two-way valve and the second two-way valve are selectively energized so that the water outlet of the main water tank is selectively connected to the second water inlet of the fifth pressure water tank or the third water inlet of the first pressure water tank.

[0059] Two electric two-way valves are used, which can be fully opened or closed to control the flow of water. One electric two-way valve is installed on the pipeline between the main unit water outlet and the user's hot water outlet, and is kept in a normally open state. It can be opened to allow hot water to flow, or closed to stop the flow of hot water to the water tank. Another electric two-way valve can be installed between the main unit water outlet and the water tank to further control the flow of hot water into the water tank, and is only opened when the defrost program is started. It can regulate the hot water before it enters the water tank, or cut off the flow of hot water from the main unit to the water tank when necessary.

[0060] The second temperature sensor is located in the first pressure water tank and near the second water inlet, and is used to monitor the water temperature in the water tank to ensure the quality and efficiency of the hot water supply. T5 can also be installed on the second or other level water tanks as needed. The first temperature sensor is located in the main water tank. The water pump is arranged between the water inlet of the heating host and the first water inlet of the first pressure water tank, and is used to transport cold water from the water tank to the host for heating. The heating device is used to heat the liquid in the main water tank and / or the pressure water tank.

[0061] During the operation of the hot water unit, based on the temperature detected by the first temperature sensor being lower than the first preset temperature, the heating device is controlled to heat the liquid in the main water tank and / or the five pressure water tanks to a second preset temperature, which is higher than the first preset temperature. Furthermore, based on the temperature detected by the second temperature sensor being lower than the first preset temperature, the water pump is controlled to be turned on, so that the liquid in the first pressure water tank enters the main water tank through the first water inlet of the first pressure water tank, forcing the liquid in the main water tank to flow toward the fifth pressure water tank close to the main water tank. Furthermore, based on the temperature detected by the first temperature sensor being higher than the third preset temperature, the heating device is controlled to stop heating, and the third preset temperature is higher than the second preset temperature.

[0062] The direct heating machine host is used to heat cold water to the required hot water temperature. When operating in winter or low temperature environment, it may encounter frost problems, affecting the normal operation and efficiency of the equipment. The control system built into the host will monitor the external ambient temperature and internal parameters of the equipment, such as the evaporator surface temperature, to determine whether the defrost program needs to be started. When it is detected that the defrost conditions are met, the control system will start the defrost program.

[0063] According to the temperature deviation between the main water tank and the pressure water tank, the control parameters of the first two-way valve and the second two-way valve are adjusted in real time to keep the water temperature within the respective target temperature ranges. Specifically, the following steps may be included: Step 1: The temperature of the liquid in the main water tank is read in real time by the first temperature sensor, and the temperature of the liquid in the pressure water tank is read in real time by the second temperature sensor.

[0064] Step 2: Two independent target temperature ranges are set for the main water tank and the pressure water tank, which are referred to as a first set target temperature range and a second set target temperature range, respectively.

[0065] Step 3: Initialize the PID controller to adjust the heating device and water flow control valve according to the temperature deviation.

[0066] Step 4: Adjust the heating device and the water flow control valve in real time according to the control signal calculated by the PID algorithm to keep the liquid temperature in the main water tank and the pressure water tank within the set range. If the actual temperature of the main water tank is lower than the first set target temperature range, start or increase the power of the heating device, and ensure that the first two-way valve is open to allow hot water to flow to the pressure water tank. If the actual temperature of the pressure water tank is lower than the second set target temperature range, adjust the water flow control valve to increase the flow of hot water into the pressure water tank.

[0067] Step 5: When conditions requiring defrosting are detected (such as low external ambient temperature and the evaporator surface temperature drops to near freezing point), the control system starts the defrosting procedure. Close the first two-way valve to stop the flow of hot water to the pressure water tank. Open the second two-way valve to change the direction of water flow to cooperate with the defrosting process.

[0068] If the temperature of any water tank exceeds the set safety threshold, the system will automatically shut down the heating device and trigger an alarm.

[0069] In summary, this unit provides two modes: 1. Normal heating mode: The first two-way valve is open in the normal heating mode, allowing heated water to flow from the main water tank to the pressure water tank to maintain or increase the water temperature in the pressure water tank. The second two-way valve remains closed in the normal heating mode and does not participate in the control of water flow.

[0070] 2. Defrost mode: First two-way valve: Closed in defrost mode, stops the heated water from flowing to the pressure water tank to reduce heat loss. Second two-way valve: Opened in defrost mode, allows water flow to change direction, which may be used to direct water to other paths, such as direct discharge or for defrost process.

[0071] Based on the same technical concept, the embodiment of the present application also provides a water heater control method, such as Figure 4 As shown, the method includes: S401: Turning on a water pump according to the temperature detected by the second temperature sensor being lower than a first preset temperature; S402: after the water pump is started for a set time, according to the temperature detected by the first temperature sensor being lower than the first preset temperature, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank; S403: adjusting the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0072] In a possible embodiment, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank includes: controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank until the temperature detected by the first temperature sensor reaches a second preset temperature; after reaching the second preset temperature, if the temperature detected by the first temperature sensor continues to rise until it reaches a third preset temperature, controlling the heating device to stop heating; wherein the second preset temperature is greater than the first preset temperature, and the third preset temperature is greater than the second preset temperature.

[0073] In a possible implementation, the water flow control strategy of adjusting the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor includes: acquiring in real time the first liquid temperature detected by the first temperature sensor, the second liquid temperature detected by the second temperature sensor, and the control parameters of the valve body, wherein the control parameters of the valve body include the opening of the three-way valve, or the opening of the first two-way valve and the opening of the second two-way valve; and adjusting the control parameters of the valve body in real time according to the deviation between the first liquid temperature and the second liquid temperature and the set target temperature range.

[0074] Unnecessary energy consumption is reduced by phased start-up (water pump first, then heating device) and delayed detection mechanism (T_time). After the water pump is started, the system will delay for a period of time (T_time) before detecting the casing inlet temperature. This delay is to allow the hot water remaining in the pipe (which may be the remaining hot water after previous use) to be used first. This can reduce the demand for new hot water and further optimize energy efficiency. If the hot water in the pipe has met the demand within the delay time, there is no need to start the heating device, thereby avoiding frequent starts and stops caused by instantaneous temperature fluctuations or misjudgments, and improving the stability and reliability of the system.

[0075] Two temperature sensors are installed in the main water tank and the pressure water tank respectively, which can monitor the water temperature at different locations in real time. Such a layout can more accurately reflect the overall temperature status of the hot water unit. The system can also quickly adjust the heating device and water flow control strategy according to the data of the two sensors to improve the response speed. By utilizing the hot water remaining in the pipe (delayed detection by setting a time length) and combining the real-time data of the two temperature sensors, the system can more reasonably decide whether to start the heating device. This dual detection and delay mechanism can avoid unnecessary heating operations and further optimize energy efficiency.

[0076] Acquire in real time a first liquid temperature detected by the first temperature sensor, a second liquid temperature detected by the second temperature sensor, and control parameters of a valve body, wherein the control parameters of the valve body include the opening of a three-way valve, or the opening of a first two-way valve and the opening of a second two-way valve; and adjust the control parameters of the valve body in real time according to deviations between the first liquid temperature and the second liquid temperature and a set target temperature range.

[0077] The third preset temperature is a safety threshold, and the set value is higher than the second preset temperature to ensure that heating is stopped in time after the ideal temperature is reached to avoid overheating.

[0078] Based on the same technical concept, the embodiment of the present application also provides a water heater control method, such as Figure 5 As shown, the method includes: S501: Turning on a water pump according to the temperature detected by the second temperature sensor being lower than a first preset temperature; S502: According to the temperature detected by the first temperature sensor being lower than the first preset temperature, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank; S503: adjusting the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0079] In a possible embodiment, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank includes: controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank until the temperature detected by the first temperature sensor reaches a second preset temperature; after reaching the second preset temperature, if the temperature detected by the first temperature sensor continues to rise until it reaches a third preset temperature, controlling the heating device to stop heating; wherein the second preset temperature is greater than the first preset temperature, and the third preset temperature is greater than the second preset temperature.

[0080] In a possible implementation, the water flow control strategy of adjusting the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor includes: acquiring in real time the first liquid temperature detected by the first temperature sensor, the second liquid temperature detected by the second temperature sensor, and the control parameters of the valve body, wherein the control parameters of the valve body include the opening of the three-way valve, or the opening of the first two-way valve and the opening of the second two-way valve; and adjusting the control parameters of the valve body in real time according to the deviation between the first liquid temperature and the second liquid temperature and the set target temperature range.

[0081] By controlling the heating process in stages (heating to the second preset temperature and stopping heating when the third preset temperature is reached), the system can avoid overheating and reduce unnecessary energy waste. At the same time, the heating power can be dynamically adjusted according to actual needs.

[0082] By acquiring the data of two temperature sensors (main water tank and pressure water tank) in real time and combining the control parameters of the valve body (such as the opening of the three-way valve or the opening of the two-way valve), the system can dynamically adjust the water flow direction and flow rate according to the temperature deviation. This dynamic adjustment strategy can ensure the uniformity and timeliness of hot water supply, while adapting to different usage scenarios and needs.

[0083] Figure 6 The control logic diagram provided in the embodiment of the present application is shown, which specifically includes the following steps: Step 1: The control system built into the host monitors the hot water temperature in the water tank in real time through the water tank temperature sensor T5. If T5 detects that the temperature is lower than the set start temperature T_on, the system will automatically start the heating program. If the temperature is higher than or equal to T_on, the system maintains the current state without adjustment.

[0084] Step 2: After confirming that heating is required, the control system first turns on the water pump to ensure that water flows smoothly through the host and prepares for the heating process.

[0085] Step 3: After the pump is started, the system will execute the preset delay T_time, which allows the water flow to stabilize and fully fill the pipe. After the delay, the system will detect the temperature T_in at the main engine casing inlet.

[0086] Step 4: If the casing inlet temperature T_in is lower than the opening temperature T_on, the control system will start the host to heat to raise the water temperature to the required level.

[0087] Step 5: After the host is started and running, the control system will continue to monitor the external environment and internal parameters of the equipment to determine whether the defrost program needs to be started.

[0088] Step 6: When it is detected that the defrosting conditions are met (for example, the external ambient temperature is low and the evaporator surface temperature drops to near freezing point), the control system will start the defrosting program. When the defrosting program is started, the control system will instruct the electric three-way valve to open and change the water flow direction to cooperate with the defrosting process, that is, the user's hot water outlet is connected to the pressurized water tank. When the defrosting is completed, the control system will close the electric three-way valve and return to normal water supply.

[0089] Step 7: During the operation of the unit, the control system will continuously monitor the casing inlet temperature T_in.

[0090] Step 8: When the reading of the casing inlet temperature T_in is higher than the set shutdown temperature T_off, the control system determines that heating is not needed. After the shutdown conditions are met, the control system will stop the host and enter energy-saving mode. After the host is shut down, the entire system enters standby mode and waits for the next startup conditions to be met.

[0091] If this control logic is applied to Figure 2 The water heater unit system shown, based on the first temperature and equipment parameters detected that meet the defrost conditions, sends a one-side closing signal to the three-way valve, so that the connection between the water inlet pipe of the heating main unit and the user supply pipe is disconnected, and the water inlet pipe of the heating main unit and the water outlet pipe of the pressure water tank remain connected; further, based on the first temperature and equipment parameters detected that meet the defrost stop conditions, sends an opening signal to the three-way valve, so that the connection between the water inlet pipe of the heating main unit and the user supply pipe is restored.

[0092] If this control logic is applied to Figure 3 The water heater unit system shown in the figure sends an opening signal to the second two-way valve according to the first temperature and equipment parameters detected to meet the defrosting condition, so that the water inlet pipe of the heating host is connected to the water outlet pipe of the pressure water tank; sends a closing signal to the second two-way valve according to the first temperature and equipment parameters detected to meet the defrosting stop condition. The above control logic ensures that the direct-heating water heater automatically adjusts the operating state according to actual needs and environmental conditions, thereby improving energy efficiency and system reliability.

[0093] In summary, the embodiments of the present application provide a hot water unit and a control method for the hot water unit, wherein the hot water unit includes a heating host, a pressure water tank, a water pump, a valve body, a first temperature sensor and a second temperature sensor; the heating host includes a main water tank and a heating device; the water inlet of the main water tank is connected to the first water inlet of the pressure water tank, and the water outlet of the main water tank is connected to the second water inlet of the pressure water tank; the water pump is arranged between the water inlet of the heating host and the first water inlet of the pressure water tank; the valve body is arranged between the water outlet of the main water tank and the second water inlet of the pressure water tank or the third water inlet of the pressure water tank; the first temperature sensor is located in the main water tank, and the second temperature sensor is located in the pressure water tank and close to the second water inlet of the pressure water tank; the heating device is used to heat the liquid in the main water tank and / or the pressure water tank, and adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor. The modular design of the heating unit, pressure water tank and water pump facilitates the expansion and upgrade of the unit. Through the intelligent control of the valve body, the water flow path is dynamically adjusted to ensure that hot water can be supplied quickly and evenly, reducing water temperature fluctuations and waiting time. By detecting temperature data and adjusting the working status of the heating device and the operation strategy of the water pump in real time, energy-saving operation can be achieved and the safety of the unit can be improved.

[0094] Based on the same technical concept, the embodiment of the present application also provides a water heater control system, such as Figure 7 As shown, the system comprises: A water pump control module 701, configured to start the water pump according to the temperature detected by the second temperature sensor being lower than a first preset temperature; A heating control module 702 is used to control the heating device to heat the liquid in the main water tank and / or the pressure water tank according to the temperature detected by the first temperature sensor being lower than the first preset temperature after the water pump is started for a set time; The water flow control module 703 is used to adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0095] Based on the same technical concept, the embodiment of the present application also provides a water heater control system, such as Figure 8 As shown, the system comprises: A water pump control module 801, configured to start the water pump according to the temperature detected by the second temperature sensor being lower than a first preset temperature; A heating control module 802, configured to control the heating device to heat the liquid in the main water tank and / or the pressure water tank according to the temperature detected by the first temperature sensor being lower than the first preset temperature; The water flow control module 803 is used to adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

[0096] Based on the same technical concept, an embodiment of the present application further provides a control module of a water heater, which is applied to the above-mentioned water heater, and the control module is used to execute the control method of the above-mentioned water heater.

[0097] Based on the same technical concept, an embodiment of the present application also provides a water heater system, including the above-mentioned water heater, and also including the control module or the electronic device.

[0098] The present application also provides an electronic device corresponding to the method provided in the above embodiment. Fig. 9 , which shows an electronic device diagram provided by some embodiments of the present application. The electronic device 20 may include: a processor 200, a memory 201, a bus 202 and a communication interface 203, wherein the processor 200, the communication interface 203 and the memory 201 are connected via the bus 202; the memory 201 stores a computer program that can be run on the processor 200, and the processor 200 executes the method provided by any of the aforementioned embodiments of the present application when running the computer program.

[0099] The memory 201 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one physical port (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0100] The bus 202 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory 201 is used to store programs, and the processor 200 executes the programs after receiving execution instructions. The method disclosed in any implementation of the aforementioned embodiment of the present application may be applied to the processor 200, or implemented by the processor 200.

[0101] The processor 200 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 200. The above processor 200 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a readily available programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor can be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 201, and the processor 200 reads the information in the memory 201 and completes the steps of the above method in combination with its hardware.

[0102] The electronic device provided in the embodiment of the present application and the method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the method adopted, operated or implemented by them.

[0103] The present application also provides a computer-readable storage medium corresponding to the method provided in the above embodiment. Fig.10 The computer-readable storage medium shown is a CD 30 on which a computer program (ie, a program product) is stored. When the computer program is run by a processor, the method provided in any of the aforementioned embodiments is executed.

[0104] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0105] The computer-readable storage medium provided in the above-mentioned embodiments of the present application and the method provided in the embodiments of the present application are based on the same inventive concept and have the same beneficial effects as the method adopted, run or implemented by the application program stored therein.

[0106] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present application may be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0107] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

[0108] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A water heater, characterized in that: include: A heating host, a pressure water tank, a water pump, a valve body, a first temperature sensor and a second temperature sensor; the heating host includes a main water tank and a heating device; The water inlet of the main water tank is connected to the first water inlet of the pressure water tank, and the water outlet of the main water tank is connected to the second water inlet of the pressure water tank; The water pump is arranged between the water inlet of the main water tank and the first water inlet of the pressure water tank; The valve body is arranged between the water outlet of the main water tank and the second water outlet of the pressure water tank or the third water outlet of the pressure water tank; The first temperature sensor is located in the main water tank, and the second temperature sensor is located in the pressure water tank and close to the second water inlet of the pressure water tank; The heating device is used to heat the liquid in the main water tank and / or the pressure water tank, and adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

2. The water heater unit according to claim 1, characterized in that: There are multiple pressure water tanks, which are connected in cascade. The multiple pressure water tanks include a first-stage pressure water tank and a second-stage pressure water tank. The first-stage pressure water tank is a pressure water tank far away from the main water tank in the water flow path among the multiple pressure water tanks, and the second-stage pressure water tank is a pressure water tank close to the main water tank in the water flow path among the multiple pressure water tanks. The second water inlet of the first-stage pressure water tank is connected to the first water inlet of the second-stage pressure water tank. The water inlet of the main water tank is connected to the first water outlet of the first-stage pressure water tank, the water outlet of the main water tank is connected to the second water outlet of the second-stage pressure water tank, and the second water outlet of the second-stage pressure water tank is connected to the drain pipe.

3. The water heater unit according to claim 1, characterized in that: The valve body is a three-way valve arranged between the water outlet of the main water tank and the second water outlet of the pressure water tank; The first end of the three-way valve is connected to the water outlet of the main water tank, the second end of the three-way valve is connected to the second water inlet of the pressure water tank, and the third end of the three-way valve is connected to the third water inlet of the pressure water tank. The third water inlet of the pressure water tank is located between the first water inlet and the second water inlet of the pressure water tank. The three-way valve is used to connect the water outlet of the main water tank with the third water inlet of the pressure water tank when the power is on, and to connect the water outlet of the main water tank with the second water inlet of the pressure water tank when the power is off.

4. The water heater unit according to claim 1, characterized in that: The valve body is a first two-way valve and a second two-way valve; The first end of the first two-way valve is connected to the water outlet of the main water tank, and the second end of the first two-way valve is connected to the second water outlet of the pressure water tank; the first end of the second two-way valve is connected to the water outlet of the main water tank, and the second end of the second two-way valve is connected to the third water outlet of the pressure water tank; The first two-way valve and the second two-way valve are selectively energized, so that the water outlet of the main water tank is selectively connected to the second water outlet of the pressure water tank or the third water outlet of the pressure water tank.

5. The water heater unit according to claim 1, characterized in that: The first water inlet and the second water inlet of the pressure water tank are respectively located at the two ends of the pressure water tank; the first water inlet of the pressure water tank is located below the second water inlet along the direction of gravity; the fourth water inlet of the pressure water tank is used to connect to the water supply pipe, and the second water inlet of the pressure water tank is used to connect to the drainage pipe.

6. A control method for a water heater unit, characterized in that: Applied to the water heater unit according to any one of claims 1 to 5, the method comprises: Turning on the water pump according to the temperature detected by the second temperature sensor being lower than the first preset temperature; After the water pump is started for a set time, according to the temperature detected by the first temperature sensor being lower than the first preset temperature, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank; The water flow control strategy of the valve body is adjusted in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

7. The method according to claim 6, characterized in that The step of controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank comprises: Controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank until the temperature detected by the first temperature sensor reaches a second preset temperature; After reaching the second preset temperature, if the temperature detected by the first temperature sensor continues to rise until reaching the third preset temperature, the heating device is controlled to stop heating; wherein the second preset temperature is greater than the first preset temperature, and the third preset temperature is greater than the second preset temperature.

8. The method according to claim 6, characterized in that The water flow control strategy of adjusting the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor includes: Acquire in real time a first liquid temperature detected by the first temperature sensor, a second liquid temperature detected by the second temperature sensor, and a control parameter of the valve body, wherein the control parameter of the valve body includes an opening of a three-way valve, or an opening of a first two-way valve and an opening of a second two-way valve; According to the deviation between the first liquid temperature and the second liquid temperature and a set target temperature range, the control parameter of the valve body is adjusted in real time.

9. A control method for a water heater unit, characterized in that: Applied to the water heater unit according to any one of claims 1 to 5, the method comprises: Turning on the water pump according to the temperature detected by the second temperature sensor being lower than the first preset temperature; According to the temperature detected by the first temperature sensor being lower than the first preset temperature, controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank; The water flow control strategy of the valve body is adjusted in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

10. The method according to claim 9, characterized in that The step of controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank comprises: Controlling the heating device to heat the liquid in the main water tank and / or the pressure water tank until the temperature detected by the first temperature sensor reaches a second preset temperature; After reaching the second preset temperature, if the temperature detected by the first temperature sensor continues to rise until reaching the third preset temperature, the heating device is controlled to stop heating; wherein the second preset temperature is greater than the first preset temperature, and the third preset temperature is greater than the second preset temperature.

11. The method according to claim 9, characterized in that The water flow control strategy of adjusting the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor includes: Acquire in real time a first liquid temperature detected by the first temperature sensor, a second liquid temperature detected by the second temperature sensor, and a control parameter of the valve body, wherein the control parameter of the valve body includes an opening of a three-way valve, or an opening of a first two-way valve and an opening of a second two-way valve; According to the deviation between the first liquid temperature and the second liquid temperature and a set target temperature range, the control parameter of the valve body is adjusted in real time.

12. A water heater control system, characterized in that: Applicable to the water heater unit according to any one of claims 1 to 5, the system comprising: A water pump control module, configured to start the water pump according to the temperature detected by the second temperature sensor being lower than a first preset temperature; A heating control module, configured to control the heating device to heat the liquid in the main water tank and / or the pressure water tank according to the temperature detected by the first temperature sensor being lower than the first preset temperature after the water pump is started for a set time; The water flow control module is used to adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

13. A water heater control system, characterized in that: Applicable to the water heater unit according to any one of claims 1 to 5, the system comprising: A water pump control module, configured to start the water pump according to the temperature detected by the second temperature sensor being lower than a first preset temperature; A heating control module, configured to control the heating device to heat the liquid in the main water tank and / or the pressure water tank according to the temperature detected by the first temperature sensor being lower than the first preset temperature; The water flow control module is used to adjust the water flow control strategy of the valve body in real time according to the liquid temperature detected by the first temperature sensor and the second temperature sensor.

14. A control module for a water heater, characterized in that: Applied to the hot water unit described in any one of claims 1-5, the control module is used to execute the control method described in any one of claims 6-8 and / or claims 9-11.

15. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program when executing the computer program to implement the method according to any one of claims 6 to 8 and / or claims 9 to 11.

16. A water heater system, characterized in that: The invention comprises the hot water unit according to any one of claims 1 to 5, and further comprises the control module according to claim 14 or the electronic device according to claim 15.

17. A computer-readable storage medium, characterized in that: Computer-readable instructions are stored thereon, and the computer-readable instructions can be executed by a processor to implement the method according to any one of claims 6-8 and / or claims 9-11.

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