Washing machine and washing machine control method

Abstract

The invention belongs to the technical field of clothes treatment, and discloses a washing machine and a washing machine control method.The washing machine comprises a water inlet pipeline used for introducing washing water, and the water inlet pipeline is provided with a first detection module and a first water treatment module; by arranging the first detection module, the concentration of harmful radioactive substances in water is detected through the first detection module during initial water inflow, and when a detection value of the first detection module exceeds a first preset value, the harmful radioactive substances in the water are removed through the arranged first water treatment module; the water quality of the washing water entering the inner barrel of the washing machine meets the washing standard, harmful radioactive substances are prevented from influencing the health of a user, and the washing safety of the washing machine is improved. According to the washing machine control method, when it is detected that the concentration of the harmful radioactive substances exceeds the preset concentration, the harmful radioactive substances are removed, and it is avoided that the harmful radioactive substances exist in washing water and affect user health.

Description

Technical Field

[0001] The present invention relates to the technical field of laundry treatment, and particularly to a washing machine and a control method thereof. Background Art

[0003] The water inlet pipeline of the washing machine is connected to the tap water pipe to introduce tap water for washing. Although the tap water has been treated to a certain extent in the water plant, its water quality is still lower than the drinking water standard. Moreover, during the process of leading the water to the user's home water pipe, due to some uncertain factors, the washing water entering the washing machine may still contain trace amounts of residual harmful radioactive substances, and the long-term use of this washing water affects the health of users.

[0004] Therefore, in order to prevent the occurrence of the above problems, it is urgent to design a washing machine and a control method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a washing machine and a control method thereof, which are used to ensure that the water quality of the washing water entering the washing machine meets the washing standard, avoid the existence of harmful radioactive substances from affecting the health of users, and improve the washing safety of the washing machine.

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

[0007] On the one hand, a washing machine is provided, which includes a water inlet pipeline for passing washing water, and a first detection module and a first water treatment module are arranged on the water inlet pipeline;

[0008] The first detection module is used to detect the concentration of harmful radioactive substances in the washing water;

[0009] The first water treatment module is used to remove the harmful radioactive substances in the washing water when the detection value of the first detection module exceeds a first preset value.

[0010] As a preferred solution of the washing machine provided by the present invention, a second detection module and a second water treatment module are further arranged on the water inlet pipeline downstream of the first water treatment module;

[0011] The second detection module is used to detect the concentration of harmful radioactive substances in the washing water after being treated by the first water treatment module;

[0012] The second water treatment module is used to remove the harmful radioactive substances in the washing water when the detection value of the second detection module exceeds a second preset value.

[0013] As a preferred solution of the washing machine provided by the present invention, the washing machine further includes a flow control module that is communicatively connected to both the first detection module and the second detection module;

[0014] The flow control module is used to control the water flow rate at the first water treatment module according to the detection value of the first detection module, and is used to control the water flow rate at the second water treatment module according to the detection value of the second detection module.

[0015] As a preferred solution of the washing machine provided by the present invention, a first sealed water tank is provided on the water inlet pipeline, and the first detection module is arranged in the first sealed water tank; and / or,

[0016] A second sealed water tank is provided on the water inlet pipeline, and the second detection module is arranged in the second sealed water tank.

[0017] As a preferred solution of the washing machine provided by the present invention, the first water treatment module and / or the second water treatment module is detachably arranged in the washing machine.

[0018] As a preferred solution of the washing machine provided by the present invention, the washing machine further includes a prompt module, and the prompt module is used to emit a prompt signal when the first water treatment module and the second water treatment module are working.

[0019] As a preferred solution of the washing machine provided by the present invention, a radiation protection layer is provided on the box body shell of the washing machine.

[0020] On the other hand, a washing machine control method is provided, including the following steps:

[0021] S1. Detect the concentration of harmful radioactive substances in the washing water and define it as the first concentration;

[0022] S2. Start the operation of removing harmful radioactive substances when the first concentration is higher than the preset concentration.

[0023] As a preferred solution of the washing machine control method provided by the present invention, the following steps are further included:

[0024] S3. Detect the concentration of harmful radioactive substances in the washing water after the operation of removing harmful radioactive substances in S2 and define it as the second concentration;

[0025] S4. Start the operation of removing harmful radioactive substances again when the second concentration is higher than the preset concentration.

[0026] As a preferred solution of the washing machine control method provided by the present invention, in S2, adjust the water flow rate during the operation of removing harmful radioactive substances according to the value of the first concentration;

[0027] In S4, adjust the water flow rate during the operation of removing harmful radioactive substances according to the value of the second concentration.

[0028] As a preferred embodiment of the washing machine control method provided by the present invention, in steps S2 and S4, a prompt signal is controlled to be emitted by the washing machine when performing the operation of removing harmful radioactive substances.

[0029] As a preferred embodiment of the washing machine control method provided by the present invention, the washing machine control method further includes the following steps:

[0030] Obtain the remaining ability of the module for performing the operation of removing harmful radioactive substances in S2, which is defined as the first remaining ability; obtain the remaining ability of the module for performing the operation of removing harmful radioactive substances in S4, which is defined as the second remaining ability;

[0031] When either the first remaining ability or the second remaining ability is lower than the ability threshold, an alarm signal is emitted.

[0032] As a preferred embodiment of the washing machine control method provided by the present invention, the first remaining ability is obtained by the difference between the second concentration and the first concentration;

[0033] The step of obtaining the second remaining ability includes:

[0034] Detect the concentration of harmful radioactive substances in the washing water after the operation of removing harmful radioactive substances in S4, and define it as the third concentration; the second remaining ability is obtained by the difference between the third concentration and the second concentration.

[0035] Advantages of the present invention:

[0036] For the washing machine provided by the present invention, by setting the first detection module, the concentration of harmful radioactive substances in the water is first detected by the first detection module during initial water inlet. When the detection value of the first detection module exceeds the first preset value, the harmful radioactive substances in the water are removed by the provided first water treatment module, so that the quality of the washing water entering the inner drum of the washing machine meets the washing standard, avoiding the influence on user health due to the existence of harmful radioactive substances and improving the washing safety of the washing machine.

[0037] For the washing machine control method provided by the present invention, when it is detected that the concentration of harmful radioactive substances exceeds the preset concentration, an operation of removing harmful radioactive substances is performed, avoiding the influence on user health due to the existence of harmful radioactive substances in the washing water. Description of the drawings

[0038] Figure 1 is the first view of the washing machine water inlet system provided by the specific embodiment of the present invention;

[0039] Figure 2 is the second view of the washing machine water inlet system provided by the specific embodiment of the present invention;

[0040] Figure 3 It is a flowchart of the washing machine control method provided by the specific embodiment of the present invention.

[0041] In the figure:

[0042] 1. First detection module; 2. First water treatment module; 3. Second detection module; 4. Second water treatment module; 5. Third detection module; 6. Water inlet. Specific embodiment

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0044] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0045] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0046] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0048] The water inlet pipeline of the washing machine is connected to the tap water pipe to introduce tap water for washing. Although the tap water has undergone certain treatment in the waterworks, its water quality is still lower than the drinking water standard. Moreover, during the process of leading the water to the user's home water pipe, due to some uncertain factors, there may still be trace amounts of residual harmful radioactive substances in the washing water entering the washing machine, and the long-term use of this washing water will affect the health of users.

[0049] Based on the above problems, this embodiment provides a washing machine. As Figure 1 shown, the water inlet system of this washing machine includes a water inlet pipeline for passing the washing water, and a first detection module 1 and a first water treatment module 2 are arranged on the water inlet pipeline. Further, a first electric control valve is arranged on the pipeline between the first detection module 1 and the water inlet 6, and a second electric control valve is arranged between the first detection module 1 and the first water treatment module 2.

[0050] The first detection module 1 is used to detect the concentration of harmful radioactive substances in the washing water; when the detection value of the first detection module 1 is lower than the first preset value, it indicates that the water quality is good, the first electric control valve opens, and the washing water can directly pass through the pipeline between the first detection module 1 and the water inlet 6 and enter the inner tub of the washing machine. When the detection value of the first detection module 1 exceeds the first preset value, it indicates that the concentration of harmful radioactive substances in the washing water exceeds the preset concentration. At this time, the washing water needs to be treated, the first electric control valve is in the closed state, the second electric control valve opens, the washing water enters the first water treatment module 2 through the corresponding pipeline, and the first water treatment module 2 can remove the harmful radioactive substances in the washing water.

[0051] The washing machine provided by the present invention, by setting the first detection module 1, first detects the concentration of harmful radioactive substances in the water through the first detection module 1 during the initial water inlet. When the detection value of the first detection module 1 exceeds the first preset value, the harmful radioactive substances in the water are removed through the set first water treatment module 2, so that the water quality of the washing water entering the inner tub of the washing machine meets the washing standard, avoiding the influence on the health of users due to the existence of harmful radioactive substances, and improving the washing safety of the washing machine.

[0052] See Figure 1 , a second detection module 3 and a second water treatment module 4 are further arranged on the water inlet pipeline downstream of the first water treatment module 2. A third electric control valve is arranged on the pipeline between the second detection module 3 and the water inlet 6, and a fourth electric control valve is arranged between the second detection module 3 and the second water treatment module 4.

[0053] The second detection module 3 is used to detect the concentration of harmful radioactive substances in the washing water after being treated by the first water treatment module 2; when the detection value of the second detection module 3 is lower than the second preset value, it indicates that the water after one decontamination treatment meets the water quality requirements. At this time, the third electromagnetic valve can be opened to enable the washing water to enter the inner cylinder through the pipeline between the second detection module 3 and the water inlet 6. When the detection value of the second detection module 3 exceeds the second preset value, it indicates that the concentration of harmful radioactive substances in the washing water after the first decontamination treatment still exceeds the preset concentration. At this time, a second treatment is required. Specifically, at this time, the third electromagnetic valve is in the closed state and the fourth electromagnetic valve is in the open state to enable the second water treatment module 4 to remove the harmful radioactive substances in the washing water and achieve secondary decontamination.

[0054] That is, after the washing water is treated by the first water treatment module 2, it needs to be detected by the second detection module 3. Only when it is confirmed that the harmful radioactive substances are completely removed can it be introduced into the inner cylinder. Otherwise, a second treatment is required.

[0055] It can be understood that the tap water has been treated in the waterworks. Even if there are trace amounts of harmful radioactive substances, their content is relatively small. Therefore, two water treatment modules are set up, and the washing water can basically meet the washing standard after two decontamination treatments.

[0056] Further, referring to Figure 2 , a third detection module 5 can be additionally provided downstream of the second water treatment module 4 to detect the concentration of harmful radioactive substances in the washing water after the second decontamination treatment. If the detection value of the third detection module 5 still exceeds the standard, it indicates that the water quality of the washing water exceeds the treatment capacity of the washing machine itself, and the washing machine stops water inlet and terminates the washing.

[0057] The above-mentioned first detection module 1 and second detection module 3 can both adopt water quality detectors, etc. Their detection values directly or indirectly reflect the concentration of radioactive substances. If the first detection module 1 and the second detection module 3 use water quality detectors of the same model, the above-mentioned first preset value and second preset value are equal.

[0058] The first water treatment module 2 and the second water treatment module 4 can include reverse osmosis membrane devices. The reverse osmosis technology has the functions of concentration and deep purification for the treatment of medium and low concentration radioactive wastewater. The reverse osmosis membrane devices used in this embodiment are of the prior art. The reverse osmosis membrane device is a cylinder, and a gate is opened at the top of the cylinder to facilitate opening the gate to take out and replace the new reverse osmosis membrane.

[0059] Optionally, the washing machine further includes a flow control module that is communicatively connected to both the first detection module 1 and the second detection module 3. The flow control module is used to control the water flow rate at the first water treatment module 2 according to the detection value of the first detection module 1, and to control the water flow rate at the second water treatment module 4 according to the detection value of the second detection module 3. The detection values of the first detection module 1 and the second detection module 3 reflect the concentration of harmful radioactive substances. When the concentration is relatively high, the water flow rate can be adjusted to be slower to ensure that the harmful radioactive substances are completely treated.

[0060] Specifically, a functional relationship between the concentration of harmful radioactive substances and the flow rate can be established in advance. This functional relationship can be obtained through experiments and written into the computer board of the washing machine. The flow control module includes a first flowmeter, a second flowmeter, as well as the second electric control valve and the fourth electric control valve mentioned above. The first flowmeter can measure the flow rate in the pipeline between the first detection module 1 and the first water treatment module 2. The control unit of the washing machine (which can be set on the computer board of the washing machine) adjusts the opening degree of the second electric control valve according to the detection value of the first detection module 1 so that the flow rate measured by the first flowmeter reaches the corresponding value in the above-mentioned functional relationship. Similarly, the second flowmeter can measure the flow rate in the pipeline between the second detection module 3 and the second water treatment module 4. The control unit adjusts the opening degree of the fourth control valve according to the detection value of the second detection module 3 so that the flow rate value measured by the second flowmeter reaches the corresponding value in the above-mentioned functional relationship.

[0061] Preferably, a first sealed water tank is provided on the water inlet pipeline, and the first detection module 1 is arranged in the first sealed water tank. The washing water first enters the first sealed water tank for detection initially. After confirming its concentration value, it is then selected whether to directly enter the water inlet 6 or needs to be decontaminated, so as to prevent the washing water with excessive harmful radioactive substances from flowing into the pipeline between the first detection module 1 and the water inlet 6 accidentally without treatment.

[0062] Similarly, a second sealed water tank is also provided downstream of the first water treatment module 2 on the water inlet pipeline, and the second detection module 3 is arranged in the second sealed water tank. The washing water after the first treatment enters the second sealed water tank to ensure that the second detection module 3 is used for detection in a sealed environment, and to prevent the washing water with excessive harmful radioactive substances from flowing into the pipeline between the second detection module 3 and the water inlet 6 accidentally.

[0063] Preferably, both the first water treatment module 2 and the second water treatment module 4 are detachably arranged in the washing machine. After the treatment capabilities of the first water treatment module 2 and the second water treatment module 4 decline to a certain extent, a professional can be notified to disassemble and replace them. Specifically, in this embodiment, both the first water treatment module 2 and the second water treatment module 4 include reverse osmosis membrane devices, and the internal reverse osmosis membranes need to be replaced after disassembling them.

[0064] Optionally, the washing machine further includes a prompting module, which is used to emit a prompting signal when the first water treatment module 2 and the second water treatment module 4 are working, to prompt the user that the washing water is undergoing de-nucleation treatment and ask the user to wait patiently. The prompting module can be a prompting light or a display screen set on the washing machine panel, and the prompting can be carried out in the form of lighting the prompting light or changing the lighting color, and displaying text or patterns on the display screen.

[0065] In this embodiment, a radiation protection layer is provided on the casing of the washing machine. The radiation protection layer is formed of a radiation protection material to shield the radiation of harmful radioactive substances that may exist in the washing water as much as possible and ensure the safety of the user. The radiation protection layer is exemplified by a metal radiation protection paint or a radiation protection layer formed after coating with barium sulfate paint.

[0066] As Figure 3 shown, this embodiment also provides a washing machine control method, including the following steps:

[0067] S1. Detect the concentration of harmful radioactive substances in the washing water and define it as the first concentration;

[0068] S2. Start the operation of removing harmful radioactive substances when the first concentration is higher than the preset concentration.

[0069] In step S1, the first concentration is obtained through the detection value of the first detection module 1 described above; in step S2, the first water treatment module 2 is used to perform the operation of removing harmful radioactive substances. If the first concentration is lower than the preset concentration value, the washing water is directly introduced into the inner tub. In this washing machine control method, when it is detected that the concentration of harmful radioactive substances exceeds the preset concentration, the operation of removing harmful radioactive substances is performed to avoid the influence of harmful radioactive substances in the washing water on the health of the user.

[0070] See Figure 3 , in step S2, the water flow rate during the operation of removing harmful radioactive substances is adjusted according to the value of the first concentration (i.e., the detection value of the first detection module 1). When the concentration value is high, the water flow speed is slowed down to ensure more thorough removal of harmful radioactive substances. This step is implemented by the aforementioned flow control module and will not be described here again.

[0071] After step S2, the following steps are further included:

[0072] S3. Detect the concentration of harmful radioactive substances in the washing water after the operation of removing harmful radioactive substances in S2 and define it as the second concentration;

[0073] S4. Start the operation of removing harmful radioactive substances again when the second concentration is higher than the preset concentration.

[0074] In step S3, the second concentration is obtained through the detection value of the second detection module 3 described above; in step S4, the second water treatment module 4 performs an operation to remove harmful radioactive substances. If the second concentration is lower than the preset concentration, it indicates that the water after the first treatment meets the washing requirements and can be introduced into the inner cylinder.

[0075] Further, referring to Figure 3 , in step S4, the flow control module adjusts the water flow rate during the operation of removing harmful radioactive substances according to the value of the second concentration (i.e., the detection value of the second detection module 3).

[0076] Optionally, in steps S2 and S4, when performing the operation of removing harmful radioactive substances, the prompt module of the washing machine is controlled to emit a prompt signal to remind the user that the washing water is being decontaminated.

[0077] Optionally, the washing machine control method further includes the following steps:

[0078] Obtain the remaining ability of the module (i.e., the first water treatment module 2 described above) for performing the operation of removing harmful radioactive substances in S2, which is defined as the first remaining ability; obtain the remaining ability of the module (i.e., the second water treatment module 4 described above) for performing the operation of removing harmful radioactive substances in S4, which is defined as the second remaining ability;

[0079] When either the first remaining ability or the second remaining ability is lower than the ability threshold, an alarm signal is issued, thereby warning the user that the processing capabilities of the two processing modules have decreased to a certain extent and effective decontamination work can no longer be carried out, and it is necessary to notify a professional to come to disassemble and clean the two processing modules and replace the reverse osmosis membranes in the two processing modules.

[0080] Specifically, the first remaining ability is obtained through the difference between the second concentration and the first concentration. The control unit of the washing machine can obtain the detection values of the first detection module 1 and the second detection module 3 and make a difference, and this difference can reflect the first remaining ability. If this difference is less than the ability threshold, it means that after the washing water is treated by the first water treatment module 2, the harmful radioactive substances have not been significantly reduced, so it indicates that the processing ability of the first water treatment module 2 is insufficient and needs to be replaced and cleaned.

[0081] Further, the steps for obtaining the second remaining ability include:

[0082] Detect the concentration of harmful radioactive substances in the washing water after the operation of removing harmful radioactive substances in S4, and define it as the third concentration; the third concentration is specifically obtained through Figure 2For obtaining the detection value of the third detection module 5 therein, the control unit can obtain the detection values of the second detection module 3 and the third detection module 5 and take the difference. This difference can reflect the second remaining capacity. If this difference is less than the capacity threshold, it indicates that after the washing water undergoes secondary decontamination treatment by the second water treatment module 4, the harmful radioactive substances have not been significantly reduced, indicating that the processing capacity of the second water treatment module 4 is insufficient and a person should be notified for replacement.

[0083] It should be emphasized that when obtaining the second remaining capacity, if the third concentration exceeds the preset concentration value, the water inlet should be stopped and the washing program should no longer be executed.

[0084] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A washing machine, characterized in that, It includes a water inlet pipe for passing washing water, and a first detection module (1) and a first water treatment module (2) are arranged on the water inlet pipe; The first detection module (1) is used to detect the concentration of harmful radioactive substances in the washing water; The first water treatment module (2) is used to remove the harmful radioactive substances in the washing water when the detection value of the first detection module (1) exceeds a first preset value.

2. The washing machine according to claim 1, characterized in that, A second detection module (3) and a second water treatment module (4) are further arranged on the water inlet pipe downstream of the first water treatment module (2); The second detection module (3) is used to detect the concentration of harmful radioactive substances in the washing water treated by the first water treatment module (2); The second water treatment module (4) is used to remove the harmful radioactive substances in the washing water when the detection value of the second detection module (3) exceeds a second preset value.

3. The washing machine according to claim 2, wherein, The washing machine further includes a flow control module communicatively connected to both the first detection module (1) and the second detection module (3); The flow control module is used to control the water flow rate at the first water treatment module (2) according to the detection value of the first detection module (1), and to control the water flow rate at the second water treatment module (4) according to the detection value of the second detection module (3).

4. The washing machine according to claim 2, characterized in that A first sealed water tank is arranged on the water inlet pipe, and the first detection module (1) is arranged in the first sealed water tank; and / or, A second sealed water tank is arranged on the water inlet pipe, and the second detection module (3) is arranged in the second sealed water tank.

5. The washing machine according to claim 2, wherein, The first water treatment module (2) and / or the second water treatment module (4) is detachably arranged in the washing machine.

6. The washing machine according to claim 2, characterized in that, The washing machine further includes a prompt module, and the prompt module is used to emit a prompt signal when the first water treatment module (2) and the second water treatment module (4) are working.

7. The washing machine according to any one of claims 1-6, characterized in that, A radiation protection layer is arranged on the box body shell of the washing machine.

8. A washing machine control method, characterized in that, It includes the following steps: S1. Detect the concentration of harmful radioactive substances in the washing water and define it as the first concentration; S2. Start the operation of removing harmful radioactive substances when the first concentration is higher than the preset concentration.

9. The washing machine control method according to claim 8, wherein, It further includes the following steps: S3. Detect the concentration of harmful radioactive substances in the washing water after the operation of removing harmful radioactive substances in S2 and define it as the second concentration; S4. Start the operation of removing harmful radioactive substances again when the second concentration is higher than the preset concentration.

10. The washing machine control method according to claim 9, characterized in that In S2, adjust the water flow rate during the operation of removing harmful radioactive substances according to the value of the first concentration; In S4, adjust the water flow rate during the operation of removing harmful radioactive substances according to the value of the second concentration.

11. The washing machine control method according to claim 9, wherein In S2 and S4, control the washing machine to emit a prompt signal during the operation of removing harmful radioactive substances.

12. The washing machine control method according to claim 9, characterized in that, The washing machine control method further includes the following steps: Obtain the remaining harmful radioactive substance removal capacity of the module for performing the harmful radioactive substance removal operation in S2, which is defined as the first remaining capacity; obtain the remaining harmful radioactive substance removal capacity of the module for performing the harmful radioactive substance removal operation in S4, which is defined as the second remaining capacity; When any one of the first remaining capacity and the second remaining capacity is lower than the capacity threshold, an alarm signal is issued.

13. The washing machine control method according to claim 12, wherein The first remaining capacity is obtained by the difference between the second concentration and the first concentration; The steps for obtaining the second remaining capacity include: Detect the harmful radioactive substance concentration in the washing water after the harmful radioactive substance removal operation in S4, and define it as the third concentration; The second remaining capacity is obtained by the difference between the third concentration and the second concentration.

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