CN103836800B - Electric heater and control method thereof - Google Patents

Abstract

The invention discloses a method for controlling an electric water heater. The method comprises the following steps: 1) detecting multiple water temperatures at different heights in the water tank of the electric water heater; 2) calculating the average value T _ad of the multiple water temperatures Compare with N preset temperatures T ₁ , T ₁ ,..., T _n and determine the amount of hot water in the water tank according to the comparison results, where N is an integer greater than or equal to 2, i is greater than or equal to 1 and less than N Integer, T _i <T _i+1 ; 3) Display the amount of hot water. According to the control method of the electric water heater in the embodiment of the present invention, the accuracy of the detection result can be improved. The utility model has the advantages of simple structure and convenient use, and the hot water volume can be checked in real time to facilitate the use of the electric water heater and improve the performance of the electric water heater. In addition, the invention also proposes an electric water heater.

Description

Electric water heater and its control method

technical field

The invention relates to the technical field of kitchen and bathroom appliances, in particular to a method for controlling an electric water heater and an electric water heater controlled by the method.

Background technique

The existing electric water heater water tank is provided with a plurality of temperature sensors, and the plurality of temperature sensors are used to measure the water temperature at different heights in the water tank. A temperature value is preset in the controller, and the preset temperature value is compared with the temperature value of the highest point detected. If the preset temperature value is greater than or equal to the temperature value of the highest point, it will display that the amount of hot water is 0%, if the preset temperature value is less than the temperature value of the highest point, then compare the preset temperature value with other temperatures detected by the temperature sensor, And determine the amount of hot water in the water tank according to the comparison result. Finally, the display shows the amount of hot water in the electric water heater.

Because, when the water tank is heated without releasing water, the temperature values of the two places with the same height in the water tank are also not much different. According to the traditional method, the result of comparing a plurality of temperature sensors with a set value is different from the actual result. The display structure of the hot water measured by the traditional method is not accurate, and it is difficult for the user to know the actual water volume and water temperature stored in the water tank before using the hot water, which makes it inconvenient to use.

Contents of the invention

The present invention aims at solving one of the above technical problems at least to a certain extent or at least providing a useful commercial choice. Therefore, an object of the present invention is to provide a control method for an electric water heater that can quickly and accurately display the amount of hot water.

Another object of the present invention is to provide an electric water heater controlled by the method.

According to the control method of the electric water heater according to the embodiment of the present invention, the method includes the following steps: 1) detecting multiple water temperatures at different heights in the water tank of the electric water heater; 2) calculating the average value T _ad of the multiple water temperatures Compare with N preset temperatures T ₁ , T ₂ ,..., T _n and determine the amount of hot water in the water tank according to the comparison results, where N is an integer greater than or equal to 2, i is greater than or equal to 1 and less than N Integer, T _i <T _i+1 ; 3) Display the amount of hot water.

According to the control method of the electric water heater in the embodiment of the present invention, the temperature values at different heights in the electric water heater are detected, and the average value of the temperatures can be regarded as the average temperature in the electric water heater. Then determine the amount of hot water according to the comparison results of this temperature and N preset temperatures. The temperature average method is adopted to reduce the accidental error of temperature detection and improve the accuracy. At the same time, using N preset temperatures to determine the amount of hot water in the electric water heater can improve the accuracy of the detection results without increasing the cost of electrical components. The utility model has the advantages of simple structure and convenient use, and the hot water quantity can be checked in real time for convenient use, thereby improving the performance of the electric water heater.

In addition, the control method of the electric water heater according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

In addition, according to an embodiment of the present invention, if T _ad < T ₁ , it is determined that the amount of hot water is 0%; if T _ad ≥ T _n , then it is determined that the amount of hot water is 100%; if T _i ≤ T _ad <T _i+1 , then the amount of hot water is determined to be (i/n)×100%.

According to an embodiment of the present invention, T _ad is first compared with T ₁ , if T _ad ≥ T ₁ , then T _ad is compared with T _n , if T _ad <T _n , then T _ad is sequentially compared with T ₂ , T ₃ ,..., T _n-1 for comparison.

Advantageously, there are 10 preset temperatures, and the step 1) includes detecting three temperatures at the bottom, middle and top of the water tank respectively.

Further, the N preset temperatures include a first group of N preset temperatures T ₁ ′, T ₂ ′, ..., T _n ′ and a second group of N preset temperatures T ₁ ″, T ₂ ″, ..., T _n ", the control method also includes detecting whether the water in the water tank is being used; if the water in the water tank is being used, then T _ad and the first group of N preset temperatures T ₁ ′, T ₂ ′, ..., T _n ′ are compared, and if the water in the water tank is not used, T _ad is compared with the second set of N preset temperatures T ₁ ″, T ₂ ′’ ,…, T _n ” for comparison.

An electric water heater according to an embodiment of the present invention includes: a water tank, a heating component, a plurality of temperature sensors, a controller, and a display. Specifically, the water tank is provided with a water inlet pipe and a water outlet pipe; the heating component is arranged in the water tank; the plurality of temperature sensors are arranged on the water tank for respectively detecting different height positions in the water tank. the water temperature; the controller is respectively connected with the plurality of temperature sensors, and is used to compare the average value T _ad of the plurality of water temperatures detected by the plurality of temperature sensors with the N preset temperatures T ₁ , T ₂ , ... , T _n is compared and determines the amount of hot water in the water tank according to the comparison result, wherein N is an integer greater than or equal to 2, i is an integer greater than or equal to 1 and less than N, T _i <T _i+1 ; the display It is connected with the controller and used for displaying the amount of hot water.

According to the electric water heater of the embodiment of the present invention, multiple temperature sensors are used to detect the temperature values at different heights inside the electric water heater, and the hot water quantity is determined according to the comparison results of the average value of the multiple detected temperatures and N preset temperatures. By adopting the electric water heater, the average temperature in the electric water heater is taken, thereby reducing accidental errors in temperature measurement and improving the accuracy of temperature measurement. At the same time, using N preset temperatures to determine the amount of hot water in the electric water heater can improve the accuracy of the detection results without increasing the cost of electrical components. The utility model has the advantages of simple structure and convenient use, and the hot water quantity can be checked in real time for convenient use, thereby improving the performance of the electric water heater.

According to an embodiment of the present invention, the controller determines that the amount of hot water is 0% when T _ad < T ₁ , determines that the amount of hot water is 100% when T _ad ≥ T _n , and determines that the amount of hot water is 100% when T _ad When ≤T _ad <T _i+1 , it is determined that the amount of hot water is (i/n)×100%.

Advantageously, said controller _first compares _Tad with T1, then _{compares Tad} with _Tn when _Tad≥T1 , and finally compares _{Tad sequentially} with _T2 , _T3 , ..., T _n-1 for comparison.

In addition, there are three sensors and they are respectively used to detect the temperature of the bottom, middle and top of the water tank, and the number of preset temperatures is 10.

Advantageously, the electric water heater further includes a water flow sensor, the water flow sensor is arranged on at least one of the water inlet pipe or the water outlet pipe, and is used to detect whether the water in the water tank is being used; wherein the N The preset temperatures include the first group of N preset temperatures T ₁ ', T ₂ ', ..., T _n ' and the second group of N preset temperatures T ₁ ", T ₂ ", ..., T _n "; where When detecting that the water in the water tank is being used, the controller compares T _ad with the first set of N preset temperatures T ₁ ′, T ₂ ′, ..., T _n ′, and upon detecting When the water in the water tank is not used, the controller compares T _ad with the second set of _N preset temperatures T ₁ ″, T ₂ ″, . . . , Tn ″.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the flowchart of the control method of the electric water heater of an embodiment of the present invention;

2 is a flowchart of a control method for an electric water heater according to another embodiment of the present invention;

Fig. 3 is the flow chart of the control method of the electric water heater of another embodiment of the present invention; And

Fig. 4 is a schematic diagram of an electric water heater according to an embodiment of the present invention.

Wherein, the water tank 10, the water inlet pipe 11, the water outlet pipe 12, the heating element 20, the temperature sensor 30, the water flow sensor 40, the first heating pipe 21, the second heating pipe 22, the first temperature sensor 31, the second temperature sensor 32, The third temperature sensor 33 .

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation or position indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore It should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The storage type electric water heater is used after heating the water in the water tank until it is kept warm. For the convenience of users, it is necessary to display the amount of hot water stored in the water tank. In a traditional electric water heater, multiple temperature sensors are provided on the water tank, and the multiple temperature sensors are used to measure the water temperature at different heights in the water tank. A temperature value is preset in the controller, and the preset temperature value is compared with the temperature value of the highest point detected. If the preset temperature value is greater than or equal to the temperature value of the highest point, it will display that the amount of hot water is 0%, if the preset temperature value is less than the temperature value of the highest point, then compare the preset temperature value with other temperatures detected by the temperature sensor, And determine the amount of hot water in the water tank according to the comparison result. Finally, the display shows the amount of hot water in the electric water heater. Because, when the water tank is heated without releasing water, the temperature values of the two places with the same height in the water tank are also not much different. According to the traditional method, the result of comparing a plurality of temperature sensors with a set value is different from the actual result. The display structure of the hot water measured by the traditional method is not accurate, and it is difficult for the user to know the actual water volume and water temperature stored in the water tank before using the hot water, which makes it inconvenient to use. The object of the present invention is to provide an electric water heater with simple structure and accurate detection result and its control method. The electric water heater can also detect the hot water volume of the electric water heater when it is in use and when it is not in use.

The control method of the electric water heater according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 shows the control method of the electric water heater of the embodiment of the present invention, and this method comprises the following steps:

1) Detect multiple water temperatures at different heights in the water tank of the electric water heater. This is because the temperature of the water in the water tank of the electric water heater is different at different heights, and the water temperature at the same height is basically the same, so it is necessary to detect the water temperature at different heights.

2) Calculate the average value T _ad of multiple water temperatures measured in step 1), and compare the average value T _ad with N preset temperatures T ₁ , T ₂ , ..., T _n , and then according to the average value T The result of the comparison between _ad and N preset temperatures T ₁ , T ₂ , . . . , T _n determines the amount of hot water in the tank. Wherein, the N preset temperatures T ₁ , T ₂ , . . . , T _n are temperature values selected according to actual usage conditions. Among the N preset temperatures T ₁ , T ₂ , . . . , T _n , the temperature values from T ₁ to T _n gradually increase. In other words, N is an integer greater than or equal to 2, i is an integer greater than or equal to 1 and less than N, and T _i <T _i+1 .

3) Display the amount of hot water determined in step 2).

According to the control method of the electric water heater in the embodiment of the present invention, the temperature values at different heights in the electric water heater are detected, and the average value of the temperatures can be regarded as the average temperature in the electric water heater. Then determine the amount of hot water according to the comparison results of this temperature and N preset temperatures. The temperature average method is adopted to reduce the accidental error of temperature detection and improve the accuracy. At the same time, using N preset temperatures to determine the amount of hot water in the electric water heater can improve the accuracy of the detection results without increasing the cost of electrical components. The utility model has the advantages of simple structure and convenient use, and the hot water quantity can be checked in real time for convenient use, thereby improving the performance of the electric water heater.

In some embodiments of the present invention, T _ad is compared with N preset temperatures, and the amount of hot water in the water tank is determined according to the comparison results of T _ad and N preset temperatures, specifically, if T _ad < T ₁ , that is to say, the average value T _ad of the water temperature is less than the minimum value of N preset temperatures, then it is determined that the amount of hot water in the water tank is 0%.

In addition, if T _ad ≥ T _n , or in other words, T _ad is not less than the maximum value of N preset temperatures, at this point, it can be considered that the water tank is full of hot water, and the amount of hot water is determined to be 100%.

In addition, when the average value T _ad of the water temperature is between the maximum value and the minimum value of the N preset temperatures, and the amount of hot water in the water tank is between 0 and 100%, the average value T _ad of the water temperature and the N preset temperature Let T ₂ , T ₃ , . . . T _n-1 in the temperature be compared. At this time, for T _i among the N preset temperatures, if T _i ≤T _ad <T _i+1 , that is to say, two adjacent temperature values T of the average water temperature T _ad among the N preset temperatures Between _i and T _i+1 , it is determined that the amount of hot water in the tank is (i/n)×100%.

As shown in Figure 2, in a specific example of the above-mentioned embodiment, it can first be determined whether the average temperature T _ad in the water tank is less than T ₁ , if so, it will display that the amount of hot water in the water tank is 0%; if not, then determine T Whether _ad is greater than or equal to T _n , if it is, it will show that the amount of hot water in the water tank is 100%, and the heating can be stopped immediately to save energy. When using the hot water in the water tank, the water temperature in the water tank is also constantly changing due to the continuous entry of cold water, and the amount of hot water will also change with the change of the water temperature in the water tank. Users can check the usage of hot water in the water tank in real time.

Specifically, firstly, the average value T _ad of the water temperature in the water tank is compared with the minimum value T ₁ of N preset temperatures, and it is determined whether there is hot water in the water tank according to the judgment result.

If T _ad ≥ T ₁ , that is to say, there is hot water in the water tank, then compare T _ad with T _n to determine whether the water tank is full of hot water, that is to say, whether the amount of hot water in the water tank is 100%, if T _ad <T _n , at this time, the water tank is not filled with hot water, then compare T _ad sequence with T ₂ , T ₃ ,..., T _n-1 to determine the amount of hot water in the water tank.

Of course, the present invention can also use other methods for comparing T _ad with N preset temperatures, for example, comparing T _ad with N preset temperatures T ₁ , T ₂ ,..., T _n in turn, and implementing the above Example Determine the amount of hot water in the water tank according to the comparison results of T _ad with N preset temperatures T ₁ , T ₂ , . . . , T _n in sequence. The above comparison sequence of T _ad and the N preset temperatures is only an illustration of the present invention, and is not intended to limit the protection scope of the present invention.

Advantageously, in some examples of the present invention, 10 preset temperatures are used to detect the amount of hot water in the water tank, which can make the result of the amount of hot water more accurate, and at the same time, there are fewer steps for comparison, improving the detection efficiency of the electric water heater .

In addition, when detecting the temperature in the water tank, the temperatures in the bottom, middle and top of the water tank are detected respectively, and the average value of the detected temperatures is calculated. At this time, fewer temperature points need to be detected, and the detection range is wider, so that the detection process is simple and the result is more accurate.

Further, the method may further include detecting whether the water in the water tank is being used. Correspondingly, the N preset temperatures include a first group of N preset temperatures T ₁ ′, T ₂ ′, ..., T _n ' and a second group of N preset temperatures T ₁ ″, T ₂ ″, ..., T _n ".

Specifically, if the water in the water tank is being used, compare T _ad with the first set of N preset temperatures T ₁ ′, T ₂ ′, . . . , T _n ′.

If the water in the water tank is not used, T _ad is compared with the second set of _N preset temperatures T ₁ ″, T ₂ ″, . . . , Tn ″.

A specific example of the control method of the electric water heater of the present invention will be briefly described below.

In this embodiment, 10 temperature preset values are used to detect the amount of hot water. Table 1 shows the first group of N preset temperatures T ₁ ′, T ₂ ′, . . . , T _n ′. Table 2 shows the second group of N preset temperatures T ₁ ″, T ₂ ″, . . . , T _n ″.

Table 1

T ₁ ' T ₂ ' T ₃ ' T ₄ ' T ₅ ' T ₆ ' T ₇ ' T ₈ ' T ₉ ' T ₁₀ ' 31°C 34°C 38°C 42°C 47°C 51°C 58°C 64°C 67°C 71°C

Table 2

water heater capacity T ₁ " T ₂ " T ₃ " T ₄ " T ₅ " T ₆ " T ₇ " T ₈ " T ₉ " T ₁₀ " <50L 37°C 40℃ 44°C 48°C 55°C 62°C 65°C 68°C 71°C 73°C ≥50L 37°C 40℃ 43°C 46°C 49°C 53°C 57°C 61°C 65°C 68°C

Referring to Table 1 and Table 2, the control method of the electric water heater includes the following steps:

As shown in Fig. 3, in the first step, the temperatures of the upper part, the middle part and the bottom of the water tank are respectively detected, and the average value T _ad is calculated.

Step 2: Detect whether the water in the water tank is being used, if the water in the water tank is being used, go to the third step,

If the water in the water tank is not used, then go to the fourth step.

Step 3: Select to use the first set of preset temperatures T ₁ ′, T ₂ ′, . . . , T ₁₀ ′ for testing. Compare T _ad with the minimum value T ₁ ' in the first set of preset temperatures, if T _ad <T ₁ ', it will show that the hot water is 0%; if T _ad ≥ T ₁ ', then compare T _ad with the first _The maximum value T ₁₀ ' in the preset temperature _of the group, if _{T ad ≥} T ₁₀ ', then display the hot water volume is 100% _; ', ..., T ₉ ' for comparison, for any T _i ' in T ₂ ', T ₃ ', ..., T ₉ ', if T _ad ≥ T _i ', compare with T _i+1 ', if If T _ad is less than T _i+1 ', then the comparison is stopped, and the amount of hot water is determined to be (i/10)×100%, and the determined amount of hot water is displayed.

The fourth step is to select and use the second set of preset temperatures T ₁ ”, T ₂ ”,…, T ₁₀ ” for detection, and judge the selected preset temperature value according to the volume of the water storage space of the electric water heater. Compare T _ad and the minimum value T ₁ ” in the second group of preset temperature, if T _ad <T ₁ ”, it will show that the hot water is 0%; if T _ad ≥ T ₁ ”, compare T _ad with the first group of preset temperature Set the maximum value _of temperature T ₁₀ ”, if _{T ad ≥} T ₁₀ ”, then display the hot water volume as 100 _{% ;} …, T ₉ ” for comparison, for any T _i ” in T ₂ ”, T ₃ ”, …, T ₉ ”, if T _ad ≥ T _i ”, compare with T _i+1 ”, if T _ad is less than T _i+1 ”, then stop the comparison, and determine the amount of hot water as (i/10)×100%, and display the determined amount of hot water.

An electric water heater according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 4 , the electric water heater includes: a water tank 10 , a heating component 20 , a plurality of temperature sensors 30 , a controller (not shown) and a display (not shown).

Specifically, the water tank 10 is provided with a water inlet pipe 11 and a water outlet pipe 12, the water inlet pipe 11 is used to deliver water into the water tank 10, and the water outlet pipe 12 is a passage for hot water in the water tank to flow out. The water inlet pipe 11 and the water outlet pipe 12 cooperate to make the water tank 10 have a predetermined amount of water.

The heating component 20 is arranged in the water tank 10 and is used for heating the water in the water tank 10 . Wherein the heating component 20 includes a first heating pipe 21 located in the axial direction of the water tank 10 and a second heating pipe 22 located at the bottom of the water tank 10

A plurality of temperature sensors 30 are arranged on the water tank 10 for detecting water temperatures at different heights in the water tank 10 .

The controller is respectively connected with a plurality of temperature sensors 30, and is used to calculate the average value T _ad of the temperatures detected by the plurality of temperature sensors 30 and to make the average value T _ad of the water temperature and the N preset temperatures T ₁ , T ₂ , . . . and Tn are compared and the amount of hot water in the water tank 10 _is determined according to the comparison result. Where N is an integer greater than or equal to 2, i is an integer greater than or equal to 1 and less than N, and T _i <T _i+1 . At the same time, the controller can also be used to control whether the heating component 20 is working. When the detected amount of hot water is less than the demand, the controller can control the heating component 20 to start heating, and when the amount of hot water is not less than the demand, then The controller can control the heating element 20 to stop heating.

The amount of hot water in the water tank 10 determined by the controller is displayed through the display connected thereto, and the amount of hot water in the water tank is displayed for the convenience of users.

According to the electric water heater of the embodiment of the present invention, a plurality of temperature sensors 30 are used to detect the temperature values at different heights in the electric water heater, and the amount of hot water is determined according to the comparison results of the average value of the detected temperatures and N preset temperatures . The electric water heater adopts the temperature averaging method, which reduces accidental errors in temperature detection and improves accuracy. At the same time, using N preset temperatures to determine the amount of hot water in the electric water heater can improve the accuracy of the detection results without increasing the cost of electrical components. The utility model has the advantages of simple structure and convenient use, and the hot water quantity can be checked in real time for convenient use, thereby improving the performance of the electric water heater.

In some embodiments of the present invention, T _ad is compared with N preset temperatures, and the amount of hot water in the water tank is determined according to the comparison results of T _ad and N preset temperatures, specifically, if T _ad < T ₁ , that is to say, the average value T _ad of the water temperature is less than the minimum value of N preset temperatures. At this time, it can be considered that there is no hot water in the water tank, and it is determined that the amount of hot water in the water tank is 0%.

In addition, if T _ad ≥ T _n , or in other words, T _ad is greater than the maximum value of N preset temperatures, at this time, it can be considered that the water tank is full of hot water, and the amount of hot water is determined to be 100%.

In addition, when the average value T _ad of the water temperature is between the maximum value and the minimum value of the N preset temperatures, and the amount of hot water in the water tank is between 0 and 100%, the average value T _ad of the water temperature and the N preset temperature Let T ₂ , T ₃ , . . . T _n-1 in the temperature be compared. At this time, for T _i among the N preset temperatures, if T _i ≤T _ad <T _i+1 , that is to say, two adjacent temperature values T of the average water temperature T _ad among the N preset temperatures Between _i and T _i+1 , it is determined that the amount of hot water in the tank is (i/n)×100%.

In a specific example of the above embodiment, firstly, it can be determined whether the average temperature T _ad in the water tank is less than T ₁ , if so, it will display that the amount of hot water in the water tank is 0%; if not, then determine whether T _ad is not less than T _n , if it shows that the amount of hot water in the water tank is 100%, you can stop heating immediately to save energy. The amount of water will also vary with the temperature of the water in the tank. Users can check the usage of hot water in the water tank in real time.

Specifically, firstly, the average value T _ad of the water temperature in the water tank is compared with the minimum value T ₁ of N preset temperatures, and it is determined whether there is hot water in the water tank according to the judgment result.

If T _ad >T ₁ , that is to say, there is hot water in the water tank, compare T _ad with T _n to determine whether the water tank is full of hot water, that is, whether the hot water in the water tank is 100%, if T _ad ≤ T _n , at this time, the water tank is not filled with hot water, then T _ad is compared with T ₂ , T ₃ , ..., T _n-1 in order to determine the amount of hot water in the water tank.

Of course, the present invention can also use other methods for comparing T _ad with N preset temperatures, for example, comparing T _ad with N preset temperatures T ₁ , T ₂ , ..., T _n in turn, and implementing the above Example Determine the amount of hot water in the water tank according to the comparison results of T _ad with N preset temperatures T ₁ , T ₂ , . . . , T _n in turn. The above comparison sequence of T _ad and the N preset temperatures is only an illustration of the present invention, and is not intended to limit the protection scope of the present invention.

In the embodiment shown in Figure 4, there are three temperature sensors 30, and the three temperature sensors 30 include a first temperature sensor 31, a second temperature sensor 32 and a third temperature sensor 33, wherein the first temperature sensor 31 is used for Detect the temperature at the bottom of the water tank 10 , the second temperature sensor 32 is used to detect the temperature at the middle of the water tank 10 , and the third temperature sensor 33 is used to detect the temperature at the bottom of the water tank 10 . As a result, the accuracy and detection efficiency of the detection structure are improved. Of course, the present invention does not limit the number of temperature sensors 30 , and more than three temperature sensors 30 may also be used.

Advantageously, the electric water heater also includes a water flow sensor 40 , which is arranged on at least one of the water inlet pipe 11 or the water outlet pipe 12 , for detecting whether the water in the water tank 10 is being used. Specifically, when the water in the water tank 10 is used, there will be a water flow through the water inlet pipe 11 and the water outlet pipe 12. At this time, the water flow sensor 40 on the water inlet pipe 11 or the water outlet pipe 12 detects that there is a water flow. It is determined that the water in the water tank 10 is used.

The N preset temperatures include the first group of N preset temperatures T ₁ ', T ₂ ', ..., T _n ' and the second group of N preset temperatures T ₁ ", T ₂ ", ..., T _n " .

Wherein when detecting that the water in the water tank 10 is being used, the controller compares T _ad with the first set of N preset temperatures T ₁ ', T ₂ ', ..., T _n ', and when detecting that the water tank 10 is being used When the water in 10 is not used, the controller compares T _ad with the second set of N preset temperatures T ₁ ″, T ₂ ″, . . . , T _n ″.

Therefore, the detection result is accurate and convenient to use.

In addition, those of ordinary skill in the art can understand that the display of the amount of hot water in the present invention can also have other forms, for example, in other embodiments of the present invention, if T _ad ≤ T ₁ , it is determined that the The amount of hot water is 0%; if T _ad > T _n , then determine that the amount of hot water is 100%; if T _i <T _ad ≤ T _i+1 , then determine that the amount of hot water is (i/n) ×100%.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations to the present invention. Variations, modifications, substitutions, and modifications to the above-described embodiments are possible within the scope of the present invention.

Claims (8)

1. the control method of an electric heater, it is characterised in that said method comprising the steps of:

1) multiple water temperatures of differing heights position in the water tank of described electric heater are detected；

2) by meansigma methods T of the plurality of water temperature_adWith N number of preset temperature T₁、T₂、…、T_nCompare and according to comparing Result determines the hot water amount in described water tank, and wherein N is the integer more than or equal to 2, and i is more than or equal to 1 and less than N Integer, T_i<T_i+1；With

3) described hot water amount is shown；

Described N number of preset temperature includes first group of N number of preset temperature T₁’、T₂’、…、T_n' and second group of N number of preset temperature T₁”、T₂”、…、T_n”；

Described control method also includes whether the water detecting in described water tank is currently being used；

If the water in described water tank is currently being used, then by T_adWith described first group of N number of preset temperature T₁’、T₂’、…、 T_n' compare,

If the water in described water tank is not used by, then by T_adWith described second group of N number of preset temperature T₁”、T₂”、…、 T_n" compare.

The control method of electric heater the most according to claim 1, it is characterised in that

If T_ad<T₁, it is determined that described hot water amount is 0%；

If T_ad≥T_n, it is determined that described hot water amount is 100%；

If T_i≤T_ad＜ T_i+1, it is determined that described hot water amount is (i/n) × 100%.

The control method of electric heater the most according to claim 2, it is characterised in that

First by T_adWith T₁Relatively,

If T_ad≥T₁, then by T_adWith T_nRelatively,

If T_ad<T_n, then by T_adOrder and T₂, T₃..., T_n-1Compare.

The control method of electric heater the most according to claim 1, it is characterised in that described preset temperature is 10, Described step 1) include the temperature that detects bottom, middle part and top in described water tank respectively.

5. the electric heater of a kind, it is characterised in that including:

Water tank, described water tank is provided with water inlet pipe and outlet pipe；

Heater block, described heater block is located in described water tank；

Multiple temperature sensors, the plurality of temperature sensor is located on described water tank, in detecting described water tank respectively not Water temperature with height and position；

Controller, described controller is connected with the plurality of temperature sensor respectively, for the plurality of temperature sensor being examined Meansigma methods T of the multiple water temperatures measured_adWith N number of preset temperature T₁、T₂、…、T_nCompare and true according to comparative result Hot water amount in fixed described water tank, wherein N is the integer more than or equal to 2, and i is the integer more than or equal to 1 and less than N, T_i<T_i+1；With

Display, described display is connected with described controller, is used for showing described hot water amount；

Water flow sensor, described water flow sensor is located at least one in described water inlet pipe or described outlet pipe, uses In detecting whether the water that is currently in use in described water tank；

Wherein said N number of preset temperature includes first group of N number of preset temperature T₁’、T₂’、…、T_n' and second group N number of preset Temperature T₁”、T₂”、…、T_n”；

Wherein when the water detected in described water tank is currently being used described controller by T_adWith described first group N number of preset Temperature T₁’、T₂’、…、T_n' compare, and when the water detected in described water tank is not used by described controller by T_ad With described second group of N number of preset temperature T₁”、T₂”、…、T_n" compare.

Electric heater the most according to claim 5, it is characterised in that described controller is at T_ad<T₁Time determine described heat The water yield is 0, at T_ad≥T_nTime determine that described hot water amount is 100% and at T_i≤T_ad＜ T_i+1Time determine that described hot water amount is (i/n) × 100%.

Electric heater the most according to claim 6, it is characterised in that described controller is first by T_adWith T₁Relatively, Then at T_ad≥T₁Time by T_adWith T_nRelatively, finally at T_ad<T_nTime by T_adOrder and T₂, T₃..., T_n-1Compare Relatively.

Electric heater the most according to claim 5, it is characterised in that described sensor is three and is respectively used to detection The temperature at bottom, middle part and top in described water tank, described preset temperature is 10.