Electric water heater and control method

Abstract

The present invention provides an electric water heater and a control method, belonging to the technical field of household appliances. The electric water heater includes an inner tank, a partition plate, an electric heating tube assembly, a sensor assembly, a water pipe assembly and a controller. The partition plate is arranged in the inner tank to divide the cavity of the inner tank into an upper cavity and a lower cavity. The partition plate is provided with a plurality of water passing holes communicating the upper cavity and the lower cavity. There is a first water passing channel between one end of the partition plate and one side wall of the inner tank. The electric heating tube assembly includes a first electric heating tube, a second electric heating tube and a third electric heating tube. The sensor assembly includes a first temperature sensor and a second temperature sensor. The water pipe assembly includes a water inlet pipe and a water outlet pipe. Among them, the first electric heating tube, the second electric heating tube and the first temperature sensor are all arranged in the upper cavity, and the third electric heating tube and the second temperature sensor are all arranged in the lower cavity. The controller is electrically connected to the first electric heating tube, the second electric heating tube, the third electric heating tube, the first temperature sensor and the second temperature sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to an electric water heater and a control method thereof. Background Art

[0002] Currently, in the electric water heater industry, horizontal electric water heaters are mainly used. The inner diameter of the inner tank of a horizontal single-inner-tank electric water heater is often relatively large. Due to the principle that the density of hot water is lower than that of cold water, the water temperature distribution inside the single inner tank is uneven, with the upper part being hot and the lower part being cold, thus affecting the index of the hot water output rate, resulting in a large temperature difference before and after continuous water output, and thereby reducing the user experience.

[0003] To solve the above defects, horizontal double-inner-tank electric water heaters have emerged. Their inner tank structure is composed of two small-diameter single inner tanks arranged vertically and welded together. The upper and lower inner tanks are connected by two or three small-diameter pipelines. Since the diameters of the upper and lower inner tanks are not large, the water temperature distribution inside a single inner tank is relatively uniform. However, due to the insufficient diameter of the connecting pipelines between the upper and lower inner tanks, the heat exchange between the upper and lower inner tanks is seriously affected, thereby reducing the heat exchange of the hot water in the upper and lower inner tanks, making the hot water in the lower inner tank not fully utilized during the bathing process, and as a result, the improvement of the hot water output rate index is also affected. Summary of the Invention

[0004] The purpose of the present invention is to provide a water heater in which one end of a partition of the water heater has a first water passage connecting an upper cavity and a lower cavity with a side wall of the inner tank, so that the water in the upper cavity exchanges heat with the water in the lower cavity, balancing the water temperatures of the upper cavity and the lower cavity, enhancing the heat exchange of the hot water in the upper cavity and the lower cavity, enabling the hot water in the lower cavity to be fully utilized during the bathing process, improving the hot water output rate index, and moreover, when the water inlet pipe is in the water inlet state, the first electric heating tube and the second electric heating tube jointly heat the water in the upper cavity to accelerate the heating speed of the upper cavity, reduce the temperature difference before and after continuous water output, and enhance the user experience during the bathing process.

[0005] The purpose of the present invention is also to provide a control method using the above water heater.

[0006] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0007] According to one aspect of the present invention, there is provided an electric water heater, comprising an inner tank, a partition plate, an electric heating tube assembly, a sensor assembly, a water pipe assembly and a controller. A first installation hole and a second installation hole are opened at the lower end of the inner tank. The partition plate is arranged inside the inner tank to divide the cavity of the inner tank into an upper cavity and a lower cavity. The partition plate is provided with a plurality of water passing holes communicating the upper cavity and the lower cavity. There is a first water passing channel between one end of the partition plate and one side wall of the inner tank. The electric heating tube assembly includes a first electric heating tube, a second electric heating tube and a third electric heating tube. The sensor assembly includes a first temperature sensor and a second temperature sensor. The water pipe assembly includes a water inlet pipe hermetically installed in the first installation hole and a water outlet pipe hermetically installed in the second installation hole. And the upper end of the water outlet pipe passes through the partition plate. Among them, the first electric heating tube, the second electric heating tube and the first temperature sensor are all arranged in the upper cavity, the third electric heating tube and the second temperature sensor are all arranged in the lower cavity. The controller is electrically connected to the first electric heating tube, the second electric heating tube, the third electric heating tube, the first temperature sensor and the second temperature sensor to timely turn on and off the first electric heating tube, the second electric heating tube and the third electric heating tube through the first temperature sensor and the second temperature sensor.

[0008] According to an embodiment of the present invention, the sensor assembly further includes a flow sensor, and the water flow sensor is arranged on the water inlet pipe and electrically connected to the controller.

[0009] According to an embodiment of the present invention, the water inlet pipe includes an outer pipe and an inner pipe sleeved inside the outer pipe. There is a water passing cavity between the outer pipe and the inner pipe. The lower side wall of the outer pipe is provided with a water outlet hole communicating the water passing cavity and the lower cavity.

[0010] According to an embodiment of the present invention, it further includes an annular water retaining box with an opening facing downwards. The inner ring surface of the annular water retaining box is hermetically sleeved on the outer pipe. The inner ring surface of the annular water retaining box is provided with a water inlet hole corresponding to the water outlet hole to guide the incoming water to the lower part of the lower cavity.

[0011] According to an embodiment of the present invention, there is a first water passing channel between one end of the partition plate and one side wall of the inner tank, and there is also a second water passing channel between the other end of the partition plate and the other side wall of the inner tank.

[0012] The embodiment of the present invention also provides a control method for using the above electric water heater, including:

[0013] Turn on the water heater and measure the water on-off state of the water inlet pipe through the flow sensor;

[0014] When the water inlet pipe is in the water inlet state, turn on the first electric heating tube and the second electric heating tube, heat the upper cavity and detect the water temperature T in the upper cavity in real time through the first temperature sensor 实1 ;

[0015] When T 实1 ≥ the first temperature threshold T设1 When it reaches, turn off the first electric heating tube, turn on the second and third electric heating tubes, and heat the upper cavity and the lower cavity simultaneously.

[0016] When T 实1 ≥ the second temperature threshold T 设2 , turn off the first and second electric heating tubes, turn on the third electric heating tube, and heat the lower cavity alone.

[0017] When the water inlet pipe is in the closed state, turn on the second and third electric heating tubes, heat the upper cavity and the lower cavity simultaneously, and use the first temperature sensor to detect the water temperature T 实1 in the upper cavity in real time, and use the second temperature sensor to detect the water temperature T 实2 in the lower cavity in real time.

[0018] Every preset time t, compare T 实1 with T 实2 .

[0019] When T 实1 >T 实2 , turn off the second electric heating tube, turn on the third electric heating tube, and heat the lower cavity alone.

[0020] When T 实1 <T 实2 , turn off the third electric heating tube, turn on the first and second electric heating tubes, and heat the upper cavity alone.

[0021] When T 实1 =T 实2 , turn on the second and third electric heating tubes, and heat the upper cavity and the lower cavity simultaneously.

[0022] When T 实1 ≥ the third temperature threshold T 设3 , turn off all electric heating tubes.

[0023] According to an embodiment of the present invention, when T 实1 ≥ the first temperature threshold T 设1 , turn off the first electric heating tube, turn on the second and third electric heating tubes, and heat the upper cavity and the lower cavity simultaneously, including:

[0024] When the water temperature detected by the first temperature sensor in the upper cavity reaches 65 - 70 °C, turn off the first electric heating tube, turn on the second and third electric heating tubes, and heat the upper cavity and the lower cavity simultaneously.

[0025] According to an embodiment of the present invention, when T 实1 ≥ the second temperature threshold T 设2 , turn off the first and second electric heating tubes, turn on the third electric heating tube, and heat the lower cavity alone, including:

[0026] When the water temperature in the upper cavity detected by the first temperature sensor reaches 75 °C, turn off the first electric heating tube and the second electric heating tube, and turn on the third electric heating tube to heat the lower cavity alone.

[0027] According to an embodiment of the present invention, wherein when T 实1 ≥ the third temperature threshold T 设3 , turn off all electric heating tubes, including:

[0028] When the water temperature in the upper cavity detected by the first temperature sensor reaches 30 - 75 °C, turn off all electric heating tubes, and the water heater is in the standby state.

[0029] According to an embodiment of the present invention, wherein every preset time t, compare T 实1 with T 实2 , including: the controller compares T 实1 with T 实2 every 1 - 5 minutes.

[0030] One embodiment of the present invention has the following advantages or beneficial effects:

[0031] For the electric water heater and the control method of the present invention, since there is a first water passage connecting the upper cavity and the lower cavity between one end of the partition of the water heater and one side wall of the inner tank, so that the water in the upper cavity exchanges heat with the water in the lower cavity, balancing the water temperatures of the upper cavity and the lower cavity, improving the heat exchange of the hot water in the upper cavity and the lower cavity, making the hot water in the lower cavity fully used during the bathing process, improving the hot water output rate index, and when the water inlet pipe is in the water inlet state, the first electric heating tube and the second electric heating tube jointly heat the water in the upper cavity to accelerate the heating speed of the upper cavity, reduce the temperature difference before and after continuous water outlet, and improve the use experience during the bathing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present invention will become more obvious.

[0033] Figure 1 is a cross-sectional view of an electric water heater shown according to an exemplary embodiment.

[0034] Figure 2 is a three-dimensional cross-sectional view of an electric water heater shown according to an exemplary embodiment.

[0035] Figure 3 is a flowchart of a control method of an electric water heater shown according to an exemplary embodiment.

[0036] Among them, the reference numerals are explained as follows:

[0037] 1. Inner tank; 11. First mounting hole; 12. Second mounting hole; 13. Upper cavity; 14. Lower cavity; 2. Partition; 21. Water through hole; 22. First water passage; 23. Second water passage; 3. Electric heating tube assembly; 31. First electric heating tube; 32. Second electric heating tube; 33. Third electric heating tube; 4. Sensor group; 41. First temperature sensor; 42. Second temperature sensor; 5. Water pipe assembly; 51. Water inlet pipe; 52. Water outlet pipe; 6. Controller; 7. Annular water retaining box Detailed implementation mode

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed description will be omitted.

[0039] The terms "a", "an", "the", and "said" are used to denote the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to denote an open inclusion meaning and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc.

[0040] As Figure 1 and Figure 2 shown, an electric water heater according to an embodiment of the present invention includes a housing, an inner tank 1, a partition 2, an electric heating tube assembly 3, a sensor assembly 4, a water pipe assembly 5, and a controller 6.

[0041] Both the inner tank 1 and the controller 6 are disposed within the housing. The lower ends of the housing and the inner tank 1 are each provided with a first mounting hole 11, a second mounting hole 12, and a third mounting hole for mounting the water pipe assembly 5.

[0042] The partition 2 is disposed within the inner tank 1 to divide the cavity of the inner tank 1 into an upper cavity 13 and a lower cavity 14. The partition 2 is provided with a plurality of water through holes 21 communicating the upper cavity 13 and the lower cavity 14, so that the water in the upper cavity 13 and the water in the lower cavity 14 can perform heat exchange.

[0043] There is a first water passage 22 communicating the upper cavity 13 and the lower cavity 14 between one end of the partition 2 and one side wall of the inner tank 1. Preferably, the length of the first water passage 22 is 10 - 20 cm and the width is 10 - 20 cm, so that the water in the upper cavity 13 and the water in the lower cavity 14 can perform sufficient heat exchange, balance the water temperatures in the upper cavity 13 and the lower cavity 14, improve the heat exchange of the hot water in the upper cavity 13 and the lower cavity 14, enable the hot water in the lower cavity 14 to be fully used during the bathing process, and improve the hot water output rate index.

[0044] The electric heating tube assembly 3 includes a first electric heating tube 31, a second electric heating tube 32, and a third electric heating tube 33. The sensor assembly 4 includes a first temperature sensor 41 and a second temperature sensor 42. Among them, the first electric heating tube 31, the second electric heating tube 32, and the first temperature sensor 41 are all arranged in the upper cavity 13, and the third electric heating tube 33 and the second temperature sensor 42 are all arranged in the lower cavity 14.

[0045] The controller 6 is electrically connected to the first electric heating tube 31, the second electric heating tube 32, the third electric heating tube 33, the first temperature sensor 41, and the second temperature sensor 42 to timely turn on and off the first electric heating tube 31, the second electric heating tube 32, and the third electric heating tube 33 through the first temperature sensor 41 and the second temperature sensor 42.

[0046] Three relays are integrated on the controller 6, and the three relays respectively control the on and off of the power supplies of the first electric heating tube 31, the second electric heating tube 32, and the third electric heating tube 33.

[0047] The water pipe assembly 5 includes a water inlet pipe 51, a water outlet pipe 52, and a cleaning and sewage discharge pipe. The water inlet pipe 51 is hermetically installed in the first installation hole 11. A pressure valve is provided inside the water inlet pipe 51. When the water pressure in the inner tank 1 is greater than the water pressure in the water supply pipe, the pressure valve closes the water inlet pipe 51 to stop water inlet; when the water pressure in the inner tank 1 is less than the water pressure in the water supply pipe, the pressure valve opens the water inlet pipe 51, and the water in the water supply pipe enters the inner tank 1 through the water inlet pipe 51.

[0048] The water outlet pipe 52 is hermetically installed in the second installation hole 12, and the upper end of the water outlet pipe 52 passes through the partition plate 2, and the water in the upper cavity 13 flows out through the water outlet pipe 52.

[0049] The cleaning and sewage discharge pipe is hermetically installed in the third installation hole. When cleaning the inner tank 1, the inside of the inner tank 1 is cleaned through the cleaning and sewage discharge pipe.

[0050] Working principle: When the terminal valve is opened to use the electric water heater, the water inlet pipe 51 is in the water inlet state. The controller turns on the first electric heating tube 31 and the second electric heating tube 32 to jointly heat the water in the upper cavity 13, so as to accelerate the heating speed of the upper cavity 13, reduce the temperature difference before and after continuous water outlet, improve the use experience during the bathing process, and improve the hot water output rate index.

[0051] During the process of jointly heating the water in the upper cavity 13 by the first electric heating tube 31 and the second electric heating tube 32, the water temperature T in the upper cavity 13 is detected in real time through the first temperature sensor 41 实1 ;

[0052] When T 实1 ≥ the first temperature threshold T 设1When it is, the first electric heating tube 31 is turned off, the second electric heating tube 32 and the third electric heating tube 33 are turned on, and the upper cavity 13 and the lower cavity 14 are heated simultaneously to reduce the water temperature difference between the upper cavity 13 and the lower cavity 14.

[0053] When T 实1 ≥ the second temperature threshold T 设2 , the first electric heating tube 31 and the second electric heating tube 32 are turned off, the third electric heating tube 33 is turned on, and the lower cavity 14 is heated alone to balance the water temperatures of the upper cavity 13 and the lower cavity 14.

[0054] As Figures 1 to 2 shown, in a preferred embodiment of the present invention, the sensor assembly 4 further includes a flow sensor 43. The water flow sensor 43 is disposed on the water inlet pipe 51 and electrically connected to the controller 6. When the water flow sensor 43 detects water flowing in the water inlet pipe 51, the controller turns on the first electric heating tube 31 and the second electric heating tube 32 to jointly heat the water in the upper cavity 13, thereby achieving the effect of automatically turning on the first electric heating tube 31 and the second electric heating tube 32 to jointly heat the water in the upper cavity 13 when water enters.

[0055] In a preferred embodiment of the present invention, the water inlet pipe 51 includes an outer pipe and an inner pipe sleeved inside the outer pipe (not shown in the figure). There is a water passage cavity (not shown in the figure) between the outer pipe and the inner pipe. A plurality of water outlet holes (not shown in the figure) that are annularly arranged and communicate the water passage cavity with the lower cavity 14 are formed on the lower side wall of the outer pipe. The water in the water inlet pipe 51 first enters the water passage cavity from the upper end of the inner pipe and flows downward, and finally enters the lower cavity 14 through the lower water outlet holes.

[0056] In a preferred embodiment of the present invention, it further includes an annular water retaining box 7 with an opening facing downward. The inner ring surface of the annular water retaining box 7 is sealingly sleeved on the outer pipe. The inner ring surface of the annular water retaining box 7 is provided with water inlet holes corresponding to the water outlet holes to guide the incoming water to the lower part of the lower cavity 14, so that the newly entered cold water in the inner tank 1 precipitates at the bottom and does not disturb the internal hot water during bathing.

[0057] As Figures 1 to 2 shown, in a preferred embodiment of the present invention, there is a first water passage 22 between one end of the partition 2 and one side wall of the inner tank 1, and there is also a second water passage 23 between the other end of the partition 2 and the other side wall of the inner tank 1. Preferably, the opening size of the second water passage 23 is the same as the opening size of the first water passage 22 to further enhance the heat exchange of the hot water in the upper cavity 13 and the lower cavity 14.

[0058] As Figure 3 shown, an embodiment of the present invention further provides a control method using the above electric water heater, including:

[0059] Turn on the water heater and measure the water on / off state of the water inlet pipe through the flow sensor;

[0060] When the water inlet pipe 51 is in the water inlet state, turn on the first electric heating pipe 31 and the second electric heating pipe 32 so that the first electric heating pipe 31 and the second electric heating pipe 32 jointly heat the upper cavity 13 and the water temperature T in the upper cavity 13 is detected in real time through the first temperature sensor 41 实1 , so as to accelerate the heating speed of the water in the upper cavity 13 and reduce the water temperature difference before and after continuous water outlet.

[0061] When T 实1 ≥ the first temperature threshold T 设1 , then turn off the first electric heating pipe 31, turn on the second electric heating pipe 32 and the third electric heating pipe 33, and heat the upper cavity 13 and the lower cavity 14 at the same time to reduce the water temperature difference between the upper cavity 13 and the lower cavity 14.

[0062] When T 实1 ≥ the second temperature threshold T 设2 , then turn off the first electric heating pipe 31 and the second electric heating pipe 32, turn on the third electric heating pipe 33, and heat the lower cavity 14 alone to balance the water temperatures of the upper cavity 13 and the lower cavity 14.

[0063] When the water inlet pipe 51 is in the closed state, turn on the second electric heating pipe 32 and the third electric heating pipe 33, and heat the upper cavity 13 and the lower cavity 14 at the same time to reduce the water temperature difference between the upper cavity 13 and the lower cavity 14, and the water temperature T in the upper cavity 13 is detected in real time through the first temperature sensor 41 实1 , and the water temperature T in the lower cavity 14 is detected in real time through the second temperature sensor 42 实2 .

[0064] Every preset time t, compare T 实1 with T 实2 .

[0065] When T 实1 >T 实2 , then turn off the second electric heating pipe 32, turn on the third electric heating pipe 33, and heat the lower cavity 14 alone to balance the water temperatures of the upper cavity 13 and the lower cavity 14.

[0066] When T 实1 <T 实2 , then turn off the third electric heating pipe 33, turn on the first electric heating pipe 31 and the second electric heating pipe 32, and heat the upper cavity 13 alone to balance the water temperatures of the upper cavity 13 and the lower cavity 14.

[0067] When T 实1 =T 实2 , then turn on the second electric heating pipe 32 and the third electric heating pipe 33, and heat the upper cavity 13 and the lower cavity 14 at the same time to balance the water temperatures of the upper cavity 13 and the lower cavity 14.

[0068] When T 实1 ≥ the third temperature threshold T 设3 , turn off all electric heating tubes, and the water heater is in the standby state.

[0069] In a preferred embodiment of the present invention, when T 实1 ≥ the first temperature threshold T 设1 , turn off the first electric heating tube 31, turn on the second electric heating tube 32 and the third electric heating tube 33, and heat the upper cavity 13 and the lower cavity 14 simultaneously, including:

[0070] When the first temperature sensor 41 detects that the water temperature in the upper cavity 13 reaches 65 - 70 °C, turn off the first electric heating tube 31, turn on the second electric heating tube 32 and the third electric heating tube 33, and heat the upper cavity 13 and the lower cavity 14 simultaneously. When the water temperature in the upper cavity 13 is 65 - 70 °C, it has the effect of meeting the user's water temperature requirement for use. Of course, the water temperature in the upper cavity 13 is not limited to turning off the first electric heating tube 31 when it is 65 - 70 °C, and the temperature of the first temperature threshold T 设1 can be adjusted adaptively according to the usage requirements of different users.

[0071] In a preferred embodiment of the present invention, when T 实1 ≥ the second temperature threshold T 设2 , turn off the first electric heating tube 31 and the second electric heating tube 32, turn on the third electric heating tube 33, and heat the lower cavity 14 alone, including:

[0072] When the first temperature sensor 41 detects that the water temperature in the upper cavity 13 reaches 75 °C, turn off the first electric heating tube 31 and the second electric heating tube 32, turn on the third electric heating tube 33, and heat the lower cavity 14 alone. When the water temperature in the upper cavity 13 reaches 75 °C, it has the effect of meeting the user's highest water temperature requirement for use.

[0073] In a preferred embodiment of the present invention, when T 实1 ≥ the third temperature threshold T 设3 , turn off all electric heating tubes, including:

[0074] When the first temperature sensor 41 detects that the water temperature in the upper cavity 13 reaches 30 - 75 °C, turn off all electric heating tubes, and the water heater is in the standby state. Preferably, when both the first temperature sensor 41 and the second temperature sensor 42 detect that the water temperature reaches 75 °C, turn off all electric heating tubes, and the water heater is in the standby state.

[0075] In a preferred embodiment of the present invention, every preset time t, compare T 实1 with T 实2 , including: The controller 6 compares T 实1 with T 实2 every 1 - 5 minutes.

[0076] Of course, it is not limited to comparing T every 1-5 minutes 实1 with T 实2 For comparison, those skilled in the art can select the interval time according to actual needs.

[0077] In the embodiments of the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "installation", "connection", and "fixation" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0078] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present invention.

[0079] In the description of this specification, the description of terms such as "one embodiment" and "one preferred embodiment" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0080] The above are only the preferred embodiments of the embodiments of the present invention, and are not used to limit the embodiments of the present invention. For those skilled in the art, the embodiments of the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present invention shall be included in the protection scope of the embodiments of the present invention.

Claims

1. A control method for an electric water heater, the electric water heater comprising: An inner tank (1), a first mounting hole (11) and a second mounting hole (12) are opened at the lower end of the inner tank (1), A partition (2) is disposed inside the inner tank (1) to divide the cavity of the inner tank (1) into an upper cavity (13) and a lower cavity (14). The partition (2) is provided with a plurality of water passing holes (21) communicating the upper cavity (13) and the lower cavity (14). There is a first water passing channel (22) between one end of the partition (2) and one side wall of the inner tank (1), An electric heating tube assembly (3), comprising a first electric heating tube (31), a second electric heating tube (32) and a third electric heating tube (33), A sensor assembly (4), comprising a first temperature sensor (41) and a second temperature sensor (42), A water pipe assembly (5), comprising a water inlet pipe (51) sealed and installed in the first mounting hole (11) and a water outlet pipe (52) sealed and installed in the second mounting hole (12), and the upper end of the water outlet pipe (52) passes through the partition (2), and A controller (6), Wherein, the first electric heating tube (31), the second electric heating tube (32) and the first temperature sensor (41) are all disposed in the upper cavity (13), the third electric heating tube (33) and the second temperature sensor (42) are all disposed in the lower cavity (14), and the controller (6) is electrically connected to the first electric heating tube (31), the second electric heating tube (32), the third electric heating tube (33), the first temperature sensor (41) and the second temperature sensor (42) to timely turn on and off the first electric heating tube (31), the second electric heating tube (32) and the third electric heating tube (33) through the first temperature sensor (41) and the second temperature sensor (42). The control method is characterized in that the control method comprises: Turn on the water heater and measure the water on-off state of the water inlet pipe through a flow sensor; When the water inlet pipe (51) is in the water inlet state, turn on the first electric heating pipe (31) and the second electric heating pipe (32) to heat the upper cavity (13) and detect the water temperature T in the upper cavity (13) in real time through the first temperature sensor (41). 实1 ; When T 实1 ≥ the first temperature threshold T 设1 then turn off the first electric heating tube (31), turn on the second electric heating tube (32) and the third electric heating tube (33), and heat the upper cavity (13) and the lower cavity (14) simultaneously; When T 实1 ≥ the second temperature threshold T 设2 , the first electric heating tube (31) and the second electric heating tube (32) are turned off, and the third electric heating tube (33) is turned on to heat the lower cavity (14) alone; When the water inlet pipe (51) is in the closed state, turn on the second electric heating tube (32) and the third electric heating tube (33) to heat the upper cavity (13) and the lower cavity (14) simultaneously, and use the first temperature sensor (41) to detect the water temperature T in the upper cavity (13) in real time 实1 , and use the second temperature sensor (42) to detect the water temperature T in the lower cavity (14) in real time 实2 ; Every preset time t, compare T 实1 with T 实2 and perform the comparison; When T 实1 > T 实2 , the second electric heating tube (32) is turned off, and the third electric heating tube (33) is turned on to heat the lower cavity (14) alone; When T 实1 <T 实2 , the third electric heating tube (33) is turned off, and the first electric heating tube (31) and the second electric heating tube (32) are turned on to heat the upper cavity (13) alone; When T 实1 = T 实2 , the second electric heating tube (32) and the third electric heating tube (33) are turned on, and the upper cavity (13) and the lower cavity (14) are heated simultaneously; When T 实1 ≥ the third temperature threshold T 设3 , turn off all the heating tubes.

2. The control method according to claim 1, characterized in that, The sensor assembly (4) further comprises a flow sensor (43), and the flow sensor (43) is disposed on the water inlet pipe (51) and electrically connected to the controller (6).

3. The control method according to claim 2, wherein The water inlet pipe (51) comprises an outer pipe and an inner pipe sleeved inside the outer pipe. There is a water passing cavity between the outer pipe and the inner pipe, and a water outlet hole communicating the water passing cavity with the lower cavity (14) is opened on the lower side wall of the outer pipe.

4. The control method according to claim 3, wherein It further comprises an annular water retaining box (7) with an opening facing downwards. The inner ring surface of the annular water retaining box (7) is sealingly sleeved on the outer pipe, and a water inlet hole corresponding to the water outlet hole is opened on the inner ring surface of the annular water retaining box (7) to guide the inlet water to the lower part of the lower cavity (14).

5. The control method according to any one of claims 1-4, characterized in that, There is also a second water passing channel (23) between the other end of the partition (2) and the other side wall of the inner tank (1).

6. The control method according to claim 1, wherein When T 实1 ≥ the first temperature threshold T 设1 , the first electric heating tube (31) is turned off, the second electric heating tube (32) and the third electric heating tube (33) are turned on, and the upper cavity (13) and the lower cavity (14) are heated simultaneously, including: When the first temperature sensor (41) detects that the water temperature in the upper cavity (13) reaches 65 - 70 °C, turn off the first electric heating tube (31), turn on the second electric heating tube (32) and the third electric heating tube (33), and heat the upper cavity (13) and the lower cavity (14) simultaneously.

7. The control method according to claim 6, wherein When T 实1 ≥ the second temperature threshold T 设2 , the first electric heating tube (31) and the second electric heating tube (32) are turned off, and the third electric heating tube (33) is turned on to heat the lower cavity (14) alone, including: When the water temperature of the upper cavity (13) detected by the first temperature sensor (41) reaches 75 °C, turn off the first electric heating tube (31) and the second electric heating tube (32), and turn on the third electric heating tube (33) to heat the lower cavity (14) alone.

8. The control method according to claim 1, wherein Every preset time t interval, for T 实1 and T 实2 are compared, including: the controller (6) compares T 实1 with T 实2 every 1 - 5 minutes.

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