WO2022223008A1

WO2022223008A1 - Water heater using electronic anode bar in combination with magnesium bar, and inner container protection method

Info

Publication number: WO2022223008A1
Application number: PCT/CN2022/088273
Authority: WO
Inventors: 廖加均; 陈益胜
Original assignee: 瑞美(中国)热水器有限公司
Priority date: 2021-04-21
Filing date: 2022-04-21
Publication date: 2022-10-27
Also published as: CN214746499U

Abstract

Disclosed in the present invention are a water heater using an electronic anode bar in combination with a magnesium bar, and an inner container protection method. The water heater comprises a housing and further comprises an inner container, the magnesium bar, the electronic anode bar, an electric control board, a first connecting line, a second connecting line, and a third connecting line; the inner container is an enamel inner container and is located in the housing; the magnesium bar and the electronic anode bar are both inserted into the inner container, and the inner container is insulated from the magnesium bar; and the electric control board is located outside the inner container, is connected to a wiring end of the magnesium bar by means of the first connecting line, is connected to a wiring end of the electronic anode bar by means of the second connecting line, and is connected to a metal outer wall of the inner container by means of the third connecting line. According to the water heater using the electronic anode bar in combination with the magnesium bar provided by the present invention, the advantages of the electronic anode bar and the magnesium bar are both achieved, such that the inner container is better and more comprehensively protected. The present invention further provides an inner container protection method for the water heater, for use in determining conditions of the magnesium bar and/or the electronic anode bar by measuring a voltage or current change between the magnesium bar and the inner container.

Description

Water heater and inner tank protection method used in combination with electronic anode rod and magnesium rod

technical field

The invention relates to the field of water heaters, in particular to a water heater and an inner tank protection method which are used in combination with an electronic anode rod and a magnesium rod.

Background technique

At present, the common water heater liner protection on the market is either protected by magnesium rods or electronic anode rods. Under normal circumstances, the liner can be well protected from corrosion, but each has its own defects. The magnesium rod is sacrificed to protect the inner tank, which has a certain lifespan, usually 2 to 5 years. When the magnesium rod is exhausted, if it is not replaced in time, the inner tank will be corroded, and even the inner tank will leak. Happening. The electronic anode rod provides a protective current through the electronic control board to protect the inner tank from being corroded. If there is a power failure or abnormal electronic anode rod, the protective current will not be provided, the inner tank will also be corroded, and even the inner tank will leak. Case.

In addition, when the magnesium rod is used for protection, the magnesium rod will be slowly exhausted during the use of the water heater. The life of the magnesium rod is related to various factors such as its length, diameter, water temperature and water quality of the water tank, so the service life of the magnesium rod cannot be accurate. . If the magnesium rod is not replaced in time after the magnesium rod is consumed, the inner tank of the water heater will be corroded, which will seriously affect its service life.

SUMMARY OF THE INVENTION

In order to solve the above problems, one of the purposes of the present invention is to provide a water heater which is used in combination with an electronic anode rod and a magnesium rod, taking into account the advantages of the electronic anode rod and the magnesium rod, and better and more comprehensively protecting the inner tank; the purpose of the present invention is The second is to provide the above water heater liner protection method, reminding the user to replace the magnesium rod and/or the electronic anode rod, so as to better and more comprehensively protect the liner.

In order to achieve the above purpose, the technical scheme adopted in the present invention:

A water heater used in combination with an electronic anode rod and a magnesium rod, including a shell, an inner tank, a magnesium rod, an electronic anode rod, an electric control board, a first connecting wire, a second connecting wire and a third connecting wire;

The inner liner is an enamel inner liner, which is located in the outer shell, and both the magnesium rod and the electronic anode rod are inserted into the inner liner, that is, one end of the magnesium rod and the electronic anode rod is fixedly connected with the outer shell, The other end extends to the inside of the shell; and the inner pot and the magnesium rod are insulated and arranged, that is, the metal on the magnesium rod does not contact the enamel inner pot; the electric control board is located outside the inner pot, and is connected to the inner pot through the first connecting wire. The magnesium rod terminal is connected, connected with the electronic anode rod terminal through a second connecting wire, and connected with the metal outer wall of the inner tank through a third connecting wire;

The inner tank, the third connecting wire, the electric control board, the first connecting wire and the magnesium rod are connected in sequence to form a closed loop.

Further, the magnesium rod includes a first self-locking nut, a terminal, a second self-locking nut, a screw head, a connecting rod, a rod core and a magnesium layer;

The first self-locking nut, the terminal, the second self-locking nut and the screw head are sequentially sleeved on one end of the connecting rod from front to back, and the other end of the connecting rod is longitudinally connected to the rod core, and the outer wall of the rod core is Wrapped with a magnesium layer.

Further, a nylon insulating pad is sleeved on the connecting rod, the longitudinal section of the nylon insulating pad is T-shaped, the inner wall of the screw head is an I-shaped structure with wide ends and a narrow middle, and the transverse part of the T The frame is placed at the front end of the I-shaped structure, and the longitudinal part of the T-shaped structure is cushioned between the inner wall of the middle part of the I-shaped structure and the outer wall of the connecting rod; a spring washer and a flat washer are arranged between the transverse part of the nylon insulating pad and the second self-locking nut; The connecting rod is stepped, the screw head is located at the end with a small diameter of the connecting rod, and the outer wall of the end with a large diameter of the connecting rod is covered with a rubber sleeve for sealing.

Further, the rod core is a steel core.

The invention also provides a method for protecting the inner liner of a water heater which is used in combination with an electronic anode rod and a magnesium rod:

If the electronic anode rod is not energized, judge the consumption of magnesium rods. If the magnesium rods are not exhausted, the magnesium rods provide liner protection; if the magnesium rods are exhausted, a magnesium rod replacement signal is issued;

If the electronic anode rod is energized, it is judged whether the electronic anode rod is abnormal. If the electronic anode rod is normal, the electronic anode rod provides liner protection; Inner bladder protection.

Further, the method for judging the consumption of the magnesium rod includes: judging the consumption of the magnesium rod according to the magnitude of the voltage value between the magnesium rod and the inner pot and/or the variation range of the voltage value with time.

Further, the method for judging the consumption of the magnesium rods includes: judging the consumption of the magnesium rods by detecting the magnitude of the current on the closed loop and/or the variation range of the current value with time by using an electronic control panel. Under the premise that the voltage and current values are fixed, the effect of measuring the voltage and measuring the current is the same.

Further, the method for judging whether the magnesium rod is exhausted specifically includes:

If the current of the closed loop is DC current, and the DC current value is 0.5mA to 3mA, it is determined that the magnesium rod is not completely consumed; due to the life of the magnesium rod, its length, diameter, water temperature of the water tank, water quality and other factors Related, the service life of the magnesium rod cannot be accurate, and the DC current is also inaccurate. Therefore, the DC current value can be adjusted according to the actual situation. The current value can be obtained by a conventional current value acquisition method, preferably AD sampling. The AD current sampling circuit converts the current in the circuit into a voltage signal with a sampling element, and then converts it into a corresponding digital signal with ADC quantization. The current acquisition circuit is one of them.

Usually, a resistor is used and connected in series to the circuit, and the flowing current will form a corresponding voltage on the resistor; in addition, devices such as current transformers and Hall elements can be used for conversion, and the corresponding voltage can also be obtained.

If the current of the closed loop is a DC current, and the DC current value is lower than 0.5mA, it is determined that the magnesium rod is exhausted. More preferably, when the DC current value is lower than 0.25mA, it is determined that the magnesium rod is consumed. exhausted.

Further, if the current of the closed loop is a direct current, and the direct current value is higher than 3 mA, it is determined that the inner pot is defective or the water is too corrosive.

The reason for the defect of the inner tank when the DC current value is higher than 3mA is: when there is no enamel in the enamel inner tank, or the enamel falls off, the metal of the enamel inner tank is not protected by the enamel, and it is exposed to the outside, which aggravates the corrosion. Make the protection current larger. Excessively corrosive water will also aggravate corrosion and make the protection current larger.

Further, the value of the DC current needs to be collected once at an interval of 2 hours, 3 consecutive collections, and it is valid only when the values collected each time are almost the same.

Further, the method of judging whether the electronic anode rod is abnormal is: make the electronic anode rod be in the energized and power-off state respectively, and measure the consumption situation of the magnesium rod respectively, if the current and/or voltage value in the two cases change The amplitude does not exceed 20%, and the consumption rate of magnesium rod refers to the consumption rate of magnesium on the magnesium rod, and it is judged that the electronic anode rod is abnormal.

Further, the method for judging whether the electronic anode rod is abnormal specifically includes:

Note that the voltage value and/or current value of the closed loop gradually decreases with unit time as: Σdu/dt and/or Σdi/dt, if Σdu/dt and/or Σdi/dt are energized and disconnected respectively in the electronic anode rod If the difference in the electrical state is less than 20%, it is determined that the electronic anode rod is abnormal;

In the formula, Σ represents the summation, du/dt represents the voltage change at each moment, and di/dt represents the current change at each moment.

When the magnesium rod is consumed from 100% to about 20%, its voltage/current is relatively stable (that is, when the DC current value indicated above is 0.5mA to 3mA, the current at this time is relatively stable), but the magnesium rod from When the consumption of about 20% reaches 0%, the voltage will gradually drop to 0 (that is, when the DC current value indicated above is lower than 0.5mA, the current will gradually drop at this time). 0%, measure the Σdu/dt and/or Σdi/dt values of the electronic anode rod under power-on and power-off conditions, respectively, and compare the difference to determine whether the electronic anode rod is abnormal.

Beneficial effects of the present invention:

The water heater provided by the invention takes into account the advantages of the electronic anode rod and the magnesium rod, and protects the inner tank better and more comprehensively; when the water heater is powered on and the electronic anode rod is normal, the electronic anode rod provides protection for the inner tank; when the water heater is powered off or the electronic anode rod is not abnormal When abnormal, it automatically switches to magnesium rod to provide liner protection; it not only utilizes the advantage of never-consuming electronic anode rod, but also provides reliable protection by magnesium rod in case of power failure and abnormal electronic anode rod, which can be continuously to provide protection for the inner bladder.

In the inner tank protection method provided by the invention, when the magnesium rod is corroded, there is a weak voltage/current signal between the magnesium rod and the inner tank, and the consumption of the magnesium rod is judged according to the voltage or current change between the magnesium rod and the inner tank. It is convenient for users to replace the magnesium rod in time to avoid damage to the electric water heater.

The liner protection method provided by the invention can realize whether the enamel liner has defects or the degree of water corrosiveness according to the voltage or current between the magnesium rod and the liner, which is convenient for users to know the condition of the water heater liner or water quality, and ensures that User safety.

In the present invention, the electronic anode rods are respectively energized and de-energized, and the consumption of the magnesium rods is measured respectively, and the results are compared to determine whether the electronic anode rods are abnormal, so as to facilitate the user to replace the electronic anode rods in time.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the water heater of the present invention;

Fig. 2 is the magnesium rod schematic diagram of the present invention;

In the figure: 1. Inner tank; 2. Magnesium rod; 201, First self-locking nut; 202, Terminal; 203, Second self-locking nut; 204, Screw head; 205, Connecting rod; 206, Rod core; 207 , magnesium layer; 208, rubber sleeve; 209, nylon insulating pad; 210, spring pad; 211, flat pad; 3, electronic anode rod; 4, electric control board; 5, the first connection line; 6, the second connection line 7. The third connecting line.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention is further described below with reference to the accompanying drawings. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", " The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, so as to The specific orientation configuration and operation are therefore not to be construed as limitations of the present invention.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "provided with", "sleeve/connection", "connection", etc., should be understood in a broad sense, such as " Connection", which 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, and it can be an internal connection between two components. of connectivity. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Example 1

A water heater combined with an electronic anode rod and a magnesium rod, as shown in Figure 1, includes a shell, an inner tank 1, a magnesium rod 2, an electronic anode rod 3, an electric control board 4, a first connecting wire 5, and a second connecting wire 6 and the third connecting line 7;

The inner pot 1 is an enamel inner pot, which is located in the outer casing. Both the magnesium rod 2 and the electronic anode rod 3 are inserted into the inner pot 1, that is, one end of the magnesium rod 2 and the electronic anode rod 3 is fixedly connected to the outer casing, and the other end extends to the inside of the outer casing. ; The insulating setting between the inner pot 1 and the magnesium rod 2, that is, the metal on the magnesium rod does not contact the enamel inner pot; the electric control board 4 is located outside the inner pot 1, and is connected with the magnesium rod 2 terminal through the first connecting line 5, The second connecting wire 6 is connected to the terminal of the electronic anode rod 3 , and is connected to the outer wall of the inner pot 1 through the third connecting wire 7 . In addition, the titanium electrode of the electronic anode rod and the inner tank are installed in insulation, so that the electronic anode rod 3 and the inner tank 1 are similarly insulated. The inner tank 1 , the third connecting wire 7 , the electric control board 4 , the first connecting wire 5 and the magnesium rod 2 are connected in sequence to form a closed loop.

In this embodiment, the magnesium rod 2 and the inner pot 1 constitute a sacrificial anode to protect the cathode circuit, that is, the magnesium is sacrificed to protect the inner pot; the electronic anode rod 3 provides a protection current to protect the inner pot from being corroded; the electronic control board 4 is used for controlling The magnesium rod 2 and the electronic anode rod 3 constitute the on-off of the circuit. At least one electron anode rod 3 is provided.

Example 2

On the basis of Embodiment 1, as shown in FIG. 2 , the magnesium rod 2 includes a first self-locking nut 201 , a terminal 202 , a second self-locking nut 203 , a screw head 204 , a connecting rod 205 , a rod core 206 and a magnesium layer 207; the first self-locking nut 201, the terminal 202, the second self-locking nut 203 and the screw head 204 are sequentially sleeved on one end of the connecting rod 205 from front to back, and the bottom of the other end of the connecting rod 205 is longitudinally connected with the rod core 206, and the rod core 206 A magnesium layer 207 is wrapped on its outer wall.

The first self-locking nut 201 is used to fix the connecting rod 205 on the screw head 204; the terminal 202 is used to connect the first connecting wire 5; the second self-locking nut 203 is used to fix the terminal 202; The connecting rod 205 is used to install the rod core 206, and the outer wall of the rod core 206 is provided with a magnesium layer 207. The magnesium layer 207, the rod core 206 and the connecting rod 205 constitute the main body of the magnesium rod.

A nylon insulating pad 209 is sleeved on the connecting rod 205. The longitudinal section of the nylon insulating pad 209 is T-shaped. The inner wall of the screw head is an I-shaped structure with wide ends and a narrow middle. At the front end, the longitudinal part of the T-shape is cushioned between the inner wall of the middle part of the I-shaped structure and the outer wall of the connecting rod 205; a spring washer 210 and a flat washer 211 are arranged between the transverse part of the nylon insulating pad 209 and the second self-locking nut 203; The rubber sleeve 208 and the nylon insulating pad 209 insulate the main body of the magnesium rod and the screw head 204. When the magnesium rod is corroded, there is a weak voltage signal between the magnesium rod and the inner tank. The consumption of magnesium can be displayed intuitively, which is convenient for users to replace the magnesium rod in time to avoid damage to the electric water heater.

The connecting rod 205 is stepped, the screw head 204 is located at the end of the connecting rod 205 with a smaller diameter, and the outer wall of the end with a larger diameter of the connecting rod 205 is covered with a rubber sleeve 208 for sealing.

In order to better understand the present invention, a complete description of the working principles of Embodiment 1 and Embodiment 2 of the present invention is made below:

When the water heater is powered on and the electronic anode rod 3 is faultless, the inner pot 1 relies on the electronic anode rod 3 to provide protection, and the relay of the electric control board 4 will be disconnected at this time, so that the magnesium rod 2 and the inner pot 1 are in an insulated state, Magnesium Rod 2 will not be consumed. When the electronic control board 4 detects that the electronic anode rod 3 is abnormal, the relay of the electronic control board 4 will be turned on, thereby connecting the magnesium rod 2 and the inner pot 1, and the magnesium rod 3 provides protection. After the water heater is powered off, the relay of the electric control board 4 will also be in a conducting state, so that the magnesium rod 2 and the inner pot 1 are connected, and the magnesium rod 3 provides protection, thereby continuously providing protection for the inner pot.

When the magnesium rod 2 provides protection, the screw head 204 and the connecting rod 205 are insulated and isolated. When the magnesium rod is corroded, there is a weak voltage signal between the magnesium rod 2 and the inner pot 1. By converting the signal, the magnesium rod 2 The consumption situation of the electric control panel 4 can be displayed intuitively.

Example 3

On the basis of Embodiment 1 and/or Embodiment 2, the present invention provides a method for protecting the inner liner of a water heater used in combination with an electronic anode rod and a magnesium rod, comprising the following steps:

If the electronic anode rod 3 is not energized, the consumption of the magnesium rod 2 is judged. If the magnesium rod 2 is not exhausted, the magnesium rod 2 provides the protection of the inner tank 1; if the magnesium rod 2 is exhausted, the magnesium rod 2 replacement signal is issued. ;

If the electronic anode rod 3 is energized, it is determined whether the electronic anode rod 3 is abnormal. If the electronic anode rod 3 is normal, the electronic anode rod 3 provides the protection of the inner tank 1; if the electronic anode rod 3 is abnormal, the electronic anode rod 3 is replaced. signal and adjust to magnesium rod 2 to provide liner 1 protection.

The method for judging the consumption of the magnesium rod 2 includes: judging the consumption of the magnesium rod 2 according to the magnitude of the voltage value between the magnesium rod 2 and the inner pot 1 and/or the variation range of the voltage value with time. For example, the consumption of magnesium rods can be judged by using the electronic control board 4 to detect the magnitude of the current on the closed loop and/or the magnitude of the change of the current value with time. Under the premise that the resistance is fixed, the voltage and current values have the same effect as measuring the current, and the present invention preferably measures the current.

The method for judging whether the magnesium rod 2 is exhausted specifically includes:

If the current of the closed loop is a DC current, and the DC current value is 0.5 mA to 3 mA, it is determined that the magnesium rod 2 is not completely consumed;

If the current of the closed loop is a DC current, and the DC current value is lower than 0.5 mA, it is determined that the magnesium rod 2 is completely consumed.

It should be pointed out that since the life of the magnesium rod is related to various factors such as its length, diameter, water temperature and water quality of the water tank, the service life of the magnesium rod cannot be accurate, and the DC current is also inaccurate. Therefore, the DC current value can be based on the actual value. situation adjusted.

If the current of the closed loop is a direct current, and the direct current value is higher than 3 mA, it is determined that the inner pot 1 is defective or the water is too corrosive. The reason why the inner tank 1 is defective when the DC current value is higher than 3mA is: when there is no enamel in the enamel inner tank, or when the enamel falls off, the metal of the enamel inner tank is not protected by the enamel and is exposed outside, which aggravates the corrosion. , making the protection current larger. Excessively corrosive water will also aggravate corrosion and make the protection current larger. Therefore, it can be judged whether the inner tank 1 is defective or the water is too corrosive.

The value of the above-mentioned DC current needs to be collected once every 2 hours, 3 consecutive collections, and it is valid only when the values collected each time are almost the same.

The method of judging whether the electronic anode rod 3 is abnormal is: make the electronic anode rod 3 be in the energized and power-off state respectively, and measure the variation range of the current and/or voltage value respectively, if the consumption of the magnesium rod 2 in both cases is the same, Then it is judged that the electron anode rod 3 is abnormal. Judging whether the electronic anode rod 3 is abnormal by the consumption of the magnesium rod 2 can avoid adding too many control detection templates for the electronic anode rod 3, reduce the price of the electronic anode rod 3, and prolong the service life of the electronic anode rod 3.

The method for judging whether the electronic anode rod 3 is abnormal specifically includes:

Note that the voltage value and/or current value of the closed loop gradually decreases with unit time as: Σdu/dt and/or Σdi/dt, if Σdu/dt and/or Σdi/dt are energized and de-energized respectively in the electronic anode rod 3 If the difference in the state is less than 20%, it is determined that the electronic anode rod 3 is abnormal;

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims

A water heater used in combination with an electronic anode rod and a magnesium rod, comprising a casing, and characterized in that it further comprises an inner tank (1), a magnesium rod (2), an electronic anode rod (3), an electric control board (4), a first connecting wire (5), a second connection line (6) and a third connection line (7);

The inner pot (1) is an enamel inner pot, located in the outer shell, the magnesium rod (2) and the electronic anode rod (3) are both inserted into the inner pot (1), and the inner pot (1) and the Insulation arrangement between the magnesium rods (2); the electric control board (4) is located outside the inner pot (1), and is connected to the magnesium rod (2) terminal through a first connecting wire (5), Two connecting wires (6) are connected to the terminals of the electronic anode rod (3), and are connected to the metal outer wall of the inner pot (1) through a third connecting wire (7);

The inner tank (1), the third connecting wire (7), the electric control board (4), the first connecting wire (5) and the magnesium rod (2) are connected in sequence to form a closeable loop.
The water heater according to claim 2, wherein the magnesium rod (2) comprises a first self-locking nut (201), a wiring terminal (202), a second self-locking nut (203), and a screw head (204) , connecting rod (205), rod core (206) and magnesium layer (207);

The first self-locking nut (201), the terminal (202), the second self-locking nut (203) and the screw head (204) are sequentially fitted on one end of the connecting rod (205) from front to back, and the connecting rod The other end of (205) is longitudinally connected to the rod core (206), and the outer wall of the rod core (206) is wrapped with a magnesium layer (207).
The water heater according to claim 2, wherein a nylon insulating pad (209) is sleeved on the connecting rod (205), and the longitudinal section of the nylon insulating pad (209) is T-shaped, and the screw head The inner wall of the T-shaped structure is an I-shaped structure with wide ends at both ends and a narrow middle part. The transverse part of the T-shaped structure is framed at the front end of the I-shaped structure, and the longitudinal part of the T-shaped structure is cushioned between the inner wall of the middle part of the I-shaped structure and the outer wall of the connecting rod (205). ; A spring washer (210) and a flat washer (211) are arranged between the transverse part of the nylon insulating pad (209) and the second self-locking nut (203); the connecting rod (205) is stepped, and the screw head (204) is located at The end of the connecting rod (205) with a small diameter is covered with a rubber sleeve (208) for sealing on the outer wall of one end of the connecting rod (205) with a large diameter.
The liner protection method of the water heater used in combination of the electronic anode rod and the magnesium rod according to any one of claims 1-3, is characterized in that, comprises the following steps:

If the electronic anode rod (3) is not energized, judge the consumption of the magnesium rod (2). ) is exhausted, then the magnesium rod (2) replacement signal is issued;

If the electronic anode rod (3) is energized, it is judged whether the electronic anode rod (3) is abnormal. (3) Abnormal, the electronic anode rod (3) replacement signal is sent out, and the magnesium rod (2) is adjusted to provide the protection of the inner tank (1).
The liner protection method according to claim 4, wherein the method for judging the consumption of the magnesium rod (2) comprises: according to the magnitude of the voltage between the magnesium rod (2) and the liner (1) And/or the variation range of the voltage value with time determines the consumption condition of the magnesium rod (2).
The liner protection method according to claim 5, characterized in that, the method for judging the consumption of the magnesium rod (2) comprises: using an electric control board (4) to detect the magnitude of the current on the closed loop and/or The variation range of the current value with time determines the consumption of the magnesium rod.
liner protection method according to claim 6, is characterized in that, the judgment method of whether described magnesium rod (2) is exhausted specifically comprises:

If the current of the closed loop is a direct current, and the direct current value is 0.5 mA to 3 mA, it is determined that the magnesium rod (2) is not completely consumed;

If the current of the closed loop is a direct current, and the direct current value is lower than 0.5 mA, it is determined that the magnesium rod (2) is completely consumed.
The inner pot protection method according to claim 7, characterized in that, if the current of the closed loop is a DC current, and the DC current value is higher than 3 mA, then it is determined that the inner pot (1) has defects or excessive water corrosion. powerful.
The liner protection method according to any one of claims 5-7, characterized in that, the method for judging whether the electronic anode rod (3) is abnormal is as follows: the electronic anode rod (3) is in a power-on state and a power-off state, respectively. , and measure the consumption of the magnesium rod (2) respectively, if the variation range of the current and/or voltage value in the two cases is less than 20%, it is judged that the electronic anode rod (3) is abnormal.
The liner protection method according to claim 9, wherein the method for judging whether the electronic anode rod (3) is abnormal specifically comprises:

Note that the voltage value and/or current value of the closed loop gradually decreases with unit time as: Σdu/dt and/or Σdi/dt, if Σdu/dt and/or Σdi/dt are in the electron anode rod (3) respectively in If the difference between the power-on and power-off states is less than 20%, it is determined that the electronic anode rod (3) is abnormal;

In the formula, Σ represents the summation, du/dt represents the voltage change at each moment, and di/dt represents the current change at each moment.