A method of controlling an electrolytic cell

Abstract

The application discloses a control method of an electrolytic cell, characterized in that the method comprises the following steps: in the process of electrolysis of the electrolytic cell, the migration rate of ions through the insulating screen (4) is adjusted by driving the insulating screen to move or deform through a driving mechanism (5), the current and / or voltage of the electrolytic cell are changed, and then the pH of the electrolytic water is kept in a set range or adjusted as required. Compared with the prior art, the control method of the application is convenient for controlling the stability of the pH of the water.

Description

Technical Field

[0001] This invention relates to the field of kitchen equipment technology, specifically to a control method for an electrolytic cell. Background Technology

[0002] An electrolytic cell consists of a cell body, an anode, and a cathode. Most electrolytic cells use an ion-exchange membrane (also called a diaphragm) to separate the anode and cathode chambers. Based on the type of electrolyte, they are classified into three categories: aqueous solution electrolytic cells, molten salt electrolytic cells, and non-aqueous solution electrolytic cells. When direct current passes through the electrolytic cell, an oxidation reaction occurs at the anode-solution interface, and a reduction reaction occurs at the cathode-solution interface, thus producing electrolyzed water.

[0003] For example, the Chinese invention patent with patent application number CN201810264395.4 (publication number CN108609693A) entitled "A Method for Preparing Acidic Water and Alkaline Water" uses the electrolysis of brine to form cations and anions, which move to the two electrodes of the electrolysis. Hydrogen ions and highly reactive chlorine gas are generated from the anode. The chlorine gas dissolves in water to form hypochlorous acid and hydrochloric acid solutions as acidic water. Hydroxide ions and hydrogen gas are generated from the cathode to form sodium hydroxide solution as alkaline water.

[0004] The existing water electrolysis process has the following problems: First, ion exchange membranes are unique polymer membranes containing ionic groups that selectively allow cations or anions in a solution to pass through. They have a certain degree of flexibility and, over time, can deform under the influence of air and water pressure, or even come into contact with the electrode plates and cause dry burning, affecting the water output and the lifespan of the electrolyzer. These problems are even more serious in small electrolyzers. Secondly, during the electrolysis process, a large number of bubbles are generated on the anode and cathode plates. These bubbles accumulate on the electrode plates, ion exchange membranes, and water channels in the electrolytic cell, resulting in high voltage requirements and high energy consumption for the electrolysis system. They also reduce the effective electrolysis area, decrease the electrolysis reaction efficiency, lead to low pH of the effluent, and obstruct the smooth flow of water channels, making the pH value and voltage extremely unstable. The gas pressure will also exacerbate the deformation of the intermediate ion exchange membrane, especially in small electrolytic cells where the above problems are more serious. Third, during electrolysis, OH- ions generated at the cathode (negative electrode) - It will react with Ca in the water 2+ Mg 2+ The reaction produces scale, which deposits on the cathode and ion exchange membrane, affecting the electrolysis effect and the lifespan of the electrolytic cell. Fourth, during electrolysis, ions need to pass through the ion exchange membrane from the anode chamber to the cathode chamber before the entire electrolysis reaction can proceed. However, during the electrolysis reaction, ions and products tend to accumulate around the electrode plates, which is not conducive to the diffusion and transfer of ions and the uniformity of products, thus affecting the electrolysis efficiency and pH stability.

[0005] In addition, the Chinese invention patent "Electrolyte Manufacturing Apparatus and Electrolyte Manufacturing Method" with patent application number CN202080012097.1 (publication number CN113474492A) discloses that a mesh is set between the diaphragm and the electrode plate to separate the diaphragm and the electrode plate, so as to avoid the diaphragm contacting the electrode plate and causing dry burning. Although the water flow can form local micro-turbulence in the process of passing through the mesh, its turbulence effect is limited and cannot effectively accelerate the exhaust, inhibit scale deposition, or accelerate ion transfer. In addition, during electrolysis, if the current is too high, the overall temperature of the electrolytic cell will rise too high, and a polarization effect may occur. If the current density per unit area is too high, there will be no reaction. If the current is too low, the system will not react or the reaction will be very slow, and the effluent will be difficult to reach the target pH. Therefore, it is generally necessary to control the current to keep the effluent pH stable (especially when the current is less than a certain value, the effluent pH will drop sharply). However, during electrolysis, as the electrolyte concentration decreases, the resistance of the entire system will increase. In order to control the current to be constant, the voltage needs to be continuously increased. Therefore, a constant current power supply is required. However, constant current power supplies are expensive and difficult to develop. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a control method for an electrolyzer that facilitates the control of the pH of the effluent, in light of the current state of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a control method for an electrolytic cell that can improve the turbulence effect and thus accelerate the exhaust.

[0008] The third technical problem to be solved by the present invention is to provide a control method for an electrolytic cell that can improve the turbulence effect and thus suppress scale deposition.

[0009] The fourth technical problem to be solved by the present invention is to provide a control method for an electrolyzer that can improve the turbulence effect and thus accelerate ion transfer.

[0010] The technical solution adopted by the present invention to solve the first, second, third, and fourth technical problems mentioned above is: a control method for an electrolytic cell, wherein the electrolytic cell includes a tank body having an electrode chamber, and the electrode chamber is provided with a pair of spaced-apart electrode plates, characterized in that: the electrolytic cell further includes... An insulating mesh is disposed within the electrode chamber, located between the two electrode plates; and A drive mechanism is used to drive the insulating mesh to move or deform; The control method includes the following steps: during the electrolysis process in the electrolytic cell, the migration rate of ions through the insulating mesh is adjusted by driving the insulating mesh to move or deform through the driving mechanism, thereby changing the current and / or voltage of the electrolytic cell, and thus keeping the pH of the electrolyzed water effluent within a set range or adjusting it as needed.

[0011] To achieve the function of isolating and protecting the diaphragm, a diaphragm is provided in the tank body, which divides the inner cavity of the tank body into at least two electrode chambers. Each electrode chamber is provided with an electrode plate. The two electrode chambers are respectively referred to as the cathode chamber and the anode chamber. The electrode plate in the cathode chamber is referred to as the cathode plate, and the electrode plate in the anode chamber is referred to as the anode plate. The cathode plate and the anode plate are electrically connected to the negative and positive terminals of the external power supply, respectively. The insulating mesh is separated between adjacent diaphragms and electrode plates.

[0012] To facilitate the control of pH stability of the alkaline electrolyzed water effluent, the external power supply is a constant voltage power supply. The control method includes the following steps: Step 1: Turn on the constant voltage power supply and pass the electrolyte and soft water into the cathode chamber and anode chamber respectively. The alkaline electrolyzed water produced is discharged from the anode chamber. Step 2: During the electrolysis process, the insulating mesh is moved or deformed by the drive mechanism to ensure that the current in the electrode chamber is always higher than the set value, so as to stabilize the pH of the alkaline electrolyzed water effluent.

[0013] To facilitate the supply of raw materials and the discharge of electrolyzed water, each electrode chamber is provided with an inlet and an outlet that communicate with the electrode chamber. The inlet and outlet of the cathode chamber are connected to an external salt tank through pipes. In step one, the flow rates of both the cathode chamber and the anode chamber are 10~100mL / min.

[0014] In order to extend the usable electrolysis time of the electrolyte as much as possible without affecting the electrolysis effect, the initial concentration of the electrolyte in step one is 15~20wt%.

[0015] To accelerate bubble bursting and promote turbulence during the deformation of the insulating mesh, at least a portion of the insulating mesh is a folded section, which can extend and retract along its length under the drive of the driving mechanism. Thus, the projected area of ​​the folded section on the diaphragm can be adjusted simply by regulating the degree of extension and retraction, thereby ensuring a constant current and stabilizing the pH of the effluent when the electrolyte concentration decreases.

[0016] Of course, a drive mechanism can also be used to move the insulating mesh to adjust the orthogonal projection area of ​​the entire mesh assembly on the diaphragm, thereby ensuring a constant current when the electrolyte concentration decreases, so as to stabilize the pH of the effluent.

[0017] In order to control the current in the electrode chamber to always be higher than the set value during the electrolysis process, the electrolytic cell also includes a current monitoring device for monitoring the magnitude of the current in the electrode chamber. Step two is achieved through the following method: S21. Monitor the magnitude I of the current in the electrode chamber through the current monitoring device, and proceed to S22; S22. The control system determines whether the current magnitude I is lower than I0. If yes, proceed to S23; otherwise, return to S21. S23. The control system determines whether the folded network segment has been shortened to the limit state. If yes, proceed to S25; otherwise, proceed to S24. S24. The folding segment is shortened by a certain length by the drive mechanism, and then the process returns to S21. S25. Turn off the constant voltage power supply, stop the supply of electrolyte and soft water, and remind the user to replenish electrolyte.

[0018] In order to achieve the expansion and contraction of the folded mesh segment by driving one end of the folded mesh segment, the first end of the folded mesh segment is fixed relative to the groove body, and the power output end of the driving mechanism is connected to the second end of the folded mesh segment so that the second end of the folded mesh segment moves along the expansion and contraction direction of the folded mesh segment to adjust the expansion and contraction degree of the folded mesh segment.

[0019] To ensure that the insulating mesh always plays a good separating role, the insulating mesh also includes a flat mesh section. The flat mesh section is flat and has multiple second mesh holes on its surface for fluid to pass through. The first end of the flat mesh section is connected to the groove body through a rotating shaft, and the second end is connected to the second end of the folded mesh section. The orthographic projection area of ​​the folded mesh segment on the diaphragm is denoted as S1, and the orthographic projection area of ​​the flat mesh segment on the diaphragm is denoted as S2. The flat mesh segment is wound on the rotating shaft and can be unwound during the compression of the folded mesh segment so that the sum of S1 and S2 remains unchanged.

[0020] To achieve the driving of the folded network segment, the driving mechanism includes: A reel is located on the outside of the groove. A pull rope, with one end connected to the reel and the second end passing through the groove and extending into the corresponding electrode chamber and confined at the second end of the folded mesh section, is wound around the reel and can be unwound or wound up; and A driving component is located on the outside of the groove, and its power output end is connected to the reel to drive the reel to rotate around its own axis.

[0021] To ensure that the folded mesh segment remains stably at its maximum elongation in the initial state, the drive mechanism also includes: A first magnetic block is disposed at the second end of the pull rope; and The second magnetic block is fixed relative to the groove and can be attracted to the first magnetic block. In step one, in the initial state, the first magnetic block and the second magnetic block attract each other, and the folded mesh segment is stretched to its limit. In step two, in the final state, the first magnetic block and the second magnetic block are separated from each other, and the folded mesh segment is shortened to its limit.

[0022] Of course, the same purpose can also be achieved by setting an elastic element between the shaft and the groove so that the flat mesh segment always tends to be wound on the shaft. Moreover, this design makes it easy for the insulating mesh to be reset to its initial state.

[0023] In order to make the most of the folded mesh segments to achieve the turbulence effect, the second magnetic block is arranged close to the rotating shaft; In step one, in the initial state, the flat mesh segment is completely rolled up on the rotating shaft; In step two, in the final state, the flat mesh segment is completely unwound from the spool.

[0024] To facilitate the processing of the folded mesh segment, the folded mesh segment includes at least two unit strips arranged sequentially along its length. Each unit strip has multiple first mesh holes for fluid to pass through. The odd-numbered unit strip in the arrangement direction is designated as the first unit strip, and the even-numbered unit strip in the arrangement direction is designated as the second unit strip. The first side of the preceding first unit strip is connected to the first side of the following second unit strip, and the second side of the preceding second unit strip is connected to the second side of the following first unit strip. Adjacent unit strips have an included angle and can open and close relative to each other.

[0025] Compared with the prior art, the advantages of the present invention are as follows: (1) During the electrolysis process in the electrolytic cell, the migration rate of ions through the insulating mesh is adjusted by driving the insulating mesh to move or deform through the driving mechanism, thereby changing the current and / or voltage of the electrolytic cell, and thus keeping the pH of the electrolyzed water effluent within the set range or adjusting it as needed. (2) The driving mechanism drives the insulating mesh to move or deform to form dynamic turbulence, which can accelerate exhaust, inhibit scale deposition, and accelerate ion transfer. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of an embodiment of the electrolytic cell of the present invention in its initial state; Figure 2 for Figure 1 3D exploded view of the electrolytic cell; Figure 3 for Figure 2 A three-dimensional structural diagram of the insulating mesh. Figure 4 for Figure 2 A three-dimensional structural diagram of the central drive mechanism; Figure 5 for Figure 1 Longitudinal sectional view of the electrolytic cell; Figure 6 for Figure 5 Enlarged view of Part I; Figure 7 for Figure 1 Longitudinal sectional view of the electrolytic cell in its final state; Figure 8 This is a flowchart of an embodiment of the control method for the electrolytic cell of the present invention. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 7 The diagram shows a preferred embodiment of the electrolytic cell of the present invention. The electrolytic cell includes a cell body 1, a diaphragm 2, electrode plates 3, an insulating mesh 4, and a driving mechanism 5. The electrolytic cell in this embodiment is a single-diaphragm electrolytic cell, but it can also be designed as a double-diaphragm electrolytic cell as needed.

[0031] The groove 1 is formed by assembling two covers 11 together with fasteners, and a closed inner cavity is formed between the two covers 11; two annular sealing gaskets 12 are arranged sequentially between the two opposite end faces of the two covers 11.

[0032] The diaphragm 2 is a cation exchange membrane, vertically arranged in the inner cavity of the tank 1, with its periphery sandwiched between the two annular sealing gaskets 12. There is one diaphragm 2, which divides the inner cavity of the tank 1 into two electrode chambers 110. The electrode chamber 110 located between the front cover 11 and the diaphragm 2 is designated as cathode chamber 110a, and the electrode chamber 110 located between the rear cover 11 and the diaphragm 2 is designated as anode chamber 110b. Each cover 11 has an inlet 111 and an outlet 112 communicating with the corresponding electrode chamber 110, respectively. Therefore, the water in each electrode chamber 110 flows from bottom to top.

[0033] There is a pair of electrode plates 3, designated as cathode plate 3a and anode plate 3b. Cathode plate 3a is arranged substantially vertically at the front of cathode chamber 110a, and anode plate 3b is arranged substantially vertically at the rear of anode chamber 110b. Each electrode plate 3 has a conductive post 31 at its top, which passes upward through the corresponding cover 11 and is exposed on the top wall of the cover 11. The conductive posts 31 on cathode plate 3a and anode plate 3b are used for electrical connection to the negative and positive terminals of an external power supply, respectively.

[0034] There are two insulating meshes 4, which correspond one-to-one with the two electrode chambers 110 mentioned above. They are located in the corresponding electrode chambers 110 and are used to separate the adjacent diaphragms 2 and electrode plates 3. Each insulating mesh 4 includes folded mesh segments 41 and flat mesh segments 42 arranged sequentially from top to bottom.

[0035] Specifically, the folded mesh segment 41 is composed of at least two unit strips 411 arranged sequentially along its length. Each unit strip 411 has multiple first mesh holes 4111 arranged in a matrix for fluid to pass through. The odd-numbered unit strip 411 in the arrangement direction is designated as the first unit strip 411a, and the even-numbered unit strip 411 in the arrangement direction is designated as the second unit strip 411b. The first side of the preceding first unit strip 411a is connected to the first side of the following second unit strip 411b, and the second side of the preceding second unit strip 411b is connected to the second side of the following first unit strip 411a. The unit strip 411 located at the tail end of the folded mesh segment 41 is limited to the top of the corresponding electrode chamber 110.

[0036] The flat mesh segment 42 is flat and has multiple second mesh holes 421 arranged in a matrix to allow fluid to pass through. The bottom end of the flat mesh segment 42 is connected to the bottom of the corresponding cover 11 via a rotating shaft 422, and the top end is connected to the unit strip 411 located at the head of the aforementioned folded mesh segment 41. The flat mesh segment 42 is wound on the rotating shaft 422 and can be unwound during the compression of the folded mesh segment 41.

[0037] The aforementioned insulating mesh 4 has the following functions: First, the insulating mesh 4 separates the diaphragm 2 and the electrode plate 3, which can effectively prevent the diaphragm 2 from contacting the electrode plate 3 and causing dry burning; Second, the water flow can form local micro-turbulence as it passes through the first mesh hole 4111 and the second mesh hole 421, which can accelerate the exhaust, inhibit scale deposition, and accelerate ion transfer; Third, for the folded mesh section 41, the first mesh hole 4111 has different directions, so that water flow, ions, bubbles, etc. can pass through the first mesh hole 4111 from all directions, which can accelerate ion transfer and increase the turbulence effect.

[0038] In this embodiment, the insulating mesh 4 is made of a food-grade material that is resistant to high and low temperatures, strong acids and alkalis, and has good insulation properties, preferably food-grade Teflon. Adjacent unit strips 411 have an included angle and can open and close relative to each other; therefore, the folded mesh segment 41 as a whole presents itself as an elastic element that can stretch and contract along its length. Because the folded mesh segment 41 has a spring-like free-movement characteristic, its expansion and contraction accelerates the bursting and discharge of air bubbles and promotes turbulence, improving electrolysis efficiency and stability, and to a certain extent inhibiting scale deposition.

[0039] There are a pair of drive mechanisms 5, which correspond one-to-one with the electrode chambers 110. Each drive mechanism 5 includes a roller 51, a pull rope 52, a drive component 53, a first magnetic block 54, and a second magnetic block 55.

[0040] Specifically, the scroll 51 is located on the outside of the corresponding cover 11; The first end of the pull rope 52 is connected to the spool 51, and the second end passes through the corresponding cover 11 and each unit strip 411 and is limited to the bottom of the unit strip 411 located at the head of the above-mentioned folded mesh section 41. The pull rope 52 is wound on the spool 51 and can be unwound or wound up. The driving component 53 is a motor, located on the outside of the corresponding cover 11. Its power output end is connected to the end of the scroll 51 to drive the scroll 51 to rotate around its own axis. The first magnetic block 54 is disposed at the second end of the pull rope 52 and abuts against the bottom of the unit strip 411 located at the head of the above-mentioned folded mesh segment 41, thereby achieving the limitation of the second end of the pull rope 52 at the unit strip 411. The second magnetic block 55 is installed at the bottom of the corresponding electrode chamber 110, close to the aforementioned rotating shaft 422, and can be attracted to the first magnetic block 54.

[0041] When the drive unit 53 rotates forward, the reel 51 rotates forward synchronously, thereby driving the pull rope 52 to wind up onto the reel 51, so that the unit strip 411 located at the head of the aforementioned folded mesh segment 41 moves vertically to adjust the stretchability of the folded mesh segment 41, and has at least two states: In the initial state, the first magnetic block 54 and the second magnetic block 55 attract each other, the folded mesh segment 41 is stretched to its limit, and the flat mesh segment 42 is completely rolled up on the rotating shaft 422. In the final state, the first magnetic block 54 and the second magnetic block 55 are disengaged from each other, the folded section 41 is shortened to its limit, and the flat section 42 is completely unwound from the rotating shaft 422.

[0042] In this embodiment, the projected area of ​​the folded mesh segment 41 on the diaphragm 2 is denoted as S1, and the projected area of ​​the flat mesh segment 42 on the diaphragm 2 is denoted as S2. Therefore, the projected area of ​​the entire insulating mesh 4 on the diaphragm 2 is S = S1 + S2. Since the flat mesh segment 42 is unwound from the rotating shaft 422 during the compression of the folded mesh segment 41, S remains constant. For the insulating mesh 4, the resistance of the folded mesh segment 41 to water flow is much greater than that of the flat mesh segment 42. Therefore, the larger S1 is, the greater the resistance of the system (the denser the mesh, the slower the migration rate of ions through the pores, and the higher the resistance). The size of S1 can be adjusted simply by adjusting the stretchability of the folded mesh segment 41, thereby regulating the current when the voltage is constant.

[0043] In addition, a current monitoring device is installed on the tank 1 to monitor the current in the electrode chamber 110.

[0044] The working principle of the above-mentioned electrolytic cell is as follows: (1) In the initial state, such as Figure 5 As shown, the first magnetic block 54 and the second magnetic block 55 attract each other, and the flat mesh segment 42 is completely wound up on the rotating shaft 422. At this time, S1 is at its maximum value. Electrolyte and soft water are introduced into cathode chamber 110a and anode chamber 110b respectively. A reduction reaction occurs at the interface between cathode plate 3a and solution, and an oxidation reaction occurs at the interface between anode plate 3b and solution to produce electrolyzed water. The produced alkaline electrolyzed water is discharged from anode chamber 110b. During electrolysis, the adjacent two unit bars 411 of the folded mesh section 41 can open and close under the action of water flow. First, the insulating mesh 4 separates the diaphragm 2 and electrode plate 3, which can effectively prevent the diaphragm 2 from contacting the electrode plate 3 and causing dry burning. Second, the first mesh hole 4111 and the second mesh hole 421 of the insulating mesh 4 form local micro-turbulence, and the movement of the folded mesh section 41 forms dynamic turbulence, which can accelerate exhaust, inhibit scale deposition, and accelerate ion transfer. (2) During the electrolysis process, as the electrolyte concentration decreases, the system resistance increases. The drive unit 53 can be started to rotate forward, and the reel 51 rotates forward synchronously, thereby driving the pull rope 52 to be wound onto the reel 51. The unit strip 411 at the head of the folded mesh section 41 moves vertically, and the folded mesh section 41 is compressed to reduce S1. At the same time, the flat mesh section 42 will be unwound from the rotating shaft 422. S remains unchanged. As S1 decreases, the system resistance decreases (the number of pores between the two electrode plates 3 decreases, the ion migration rate increases, and the system resistance decreases), eliminating the system resistance change caused by the decrease in electrolyte concentration, thereby keeping the current constant when the voltage is constant, extending the electrolyte's usable electrolysis time, and reducing the frequency of electrolyte replacement (the pH can still be kept stable at low concentrations). (3) Continue until the flat section 42 is completely unwound from the spindle 422, as follows Figure 7 As shown, in the final state, the folded segment 41 can no longer be compressed further, and the electrolysis ends.

[0045] like Figure 8 As shown, the present invention also provides a control method for the above-mentioned electrolytic cell, the control method comprising the following steps: Preparation: Use a constant voltage power supply as an external power source, and connect the inlet 111 and outlet 112 of the cathode chamber 110a to the external salt tank through pipes. Step 1: Turn on the constant voltage power supply and introduce the electrolyte and soft water into the cathode chamber 110a and anode chamber 110b respectively. A reduction reaction occurs at the interface between the cathode plate 3a and the solution, and an oxidation reaction occurs at the interface between the anode plate 3b and the solution to produce electrolyzed water. The produced alkaline electrolyzed water is discharged from the anode chamber 110b. At the same time, start the drive unit 53 to reverse and completely unwind the pull rope 52 from the reel 51 so that the folded mesh section 41 is stretched to its limit. Specifically, the flow rates of both the cathode chamber 110a and the anode chamber 110b are 10~100 mL / min, and the initial concentration of the electrolyte is 15~20 wt%. Step 2: During the electrolysis process, the drive mechanism 5 drives the folding screen segment 41 to gradually shorten to ensure that the current in the electrode chamber 110 is always higher than the set value, so as to stabilize the pH of the alkaline electrolyzed water effluent. Specifically, step two above is achieved through the following method: S21. Monitor the magnitude of the current I in electrode chamber 110 using a current monitoring device, and proceed to S22. S22. The control system determines whether the current magnitude I is lower than I0. If yes, proceed to S23; otherwise, return to S21. S23. The control system determines whether the pull rope 52 of the drive mechanism 5 has been wound to the minimum value (i.e., whether the folded net segment 41 has been shortened to the limit state). If yes, proceed to S25; otherwise, proceed to S24. S24. Start the drive unit 53 to rotate forward a certain number of times, and gradually wind the pull rope 52 onto the reel 51 so that the folded net segment 41 is shortened to a certain length, and return to S21. S25. Turn off the constant voltage power supply, stop the supply of electrolyte and soft water, and remind the user to replenish electrolyte; Wherein, I0 is a preset value. When the current in electrode chamber 110 is lower than this value, the pH of the effluent will drop sharply. In this embodiment, the value of I0 is 1A.

Claims

1. A method for controlling an electrolytic cell, the electrolytic cell comprising a tank body (1) having an electrode chamber (110), wherein a pair of spaced-apart electrode plates (3) are disposed in the electrode chamber (110), characterized in that: The electrolytic cell also includes An insulating mesh (4) is disposed within the electrode chamber (110) between two electrode plates (3); and The driving mechanism (5) is used to drive the insulating mesh (4) to move or deform; The insulating mesh (4) has at least a portion of a folded mesh segment (41), which can extend and retract along its length under the drive of the driving mechanism (5); The control method includes the following steps: during the electrolysis process in the electrolytic cell, the migration rate of ions through the insulating mesh (4) is adjusted by driving the insulating mesh (4) to move or deform through the driving mechanism (5), thereby changing the current and / or voltage of the electrolytic cell, and thus keeping the pH of the electrolyzed water effluent within a set range or adjusting it as needed.

2. The control method according to claim 1, characterized in that: The tank (1) is provided with a diaphragm (2), which divides the inner cavity of the tank (1) into at least two electrode chambers (110). Each electrode chamber (110) is provided with an electrode plate (3). The two electrode chambers (110) are respectively referred to as the cathode chamber (110a) and the anode chamber (110b). The electrode plate (3) in the cathode chamber (110a) is referred to as the cathode plate (3a), and the electrode plate (3) in the anode chamber (110b) is referred to as the anode plate (3b). The cathode plate (3a) and the anode plate (3b) are electrically connected to the negative and positive poles of the external power supply, respectively. The insulating mesh (4) is separated between adjacent diaphragms (2) and electrode plates (3).

3. The control method according to claim 2, characterized in that: The external power supply is a constant voltage power supply; The control method includes the following steps: Step 1: Turn on the constant voltage power supply and pass the electrolyte and soft water into the cathode chamber (110a) and anode chamber (110b) respectively. The alkaline electrolyzed water produced is discharged from the anode chamber (110b). Step 2: During the electrolysis process, the insulating mesh is moved or deformed by the driving mechanism (5) to ensure that the current in the electrode chamber (110) is always higher than the set value so as to stabilize the pH of the alkaline electrolyzed water effluent.

4. The control method according to claim 3, characterized in that: Each electrode chamber (110) has a liquid inlet (111) and a liquid outlet (112) that communicate with the electrode chamber (110). The liquid inlet (111) and the liquid outlet (112) of the cathode chamber (110a) are respectively connected to an external salt tank through pipes. In step one, the flow rates of both the cathode chamber (110a) and the anode chamber (110b) are 10~100mL / min.

5. The control method according to claim 3, characterized in that: In step one, the initial concentration of the electrolyte is 15~20wt%.

6. The control method according to claim 3, characterized in that: The electrolytic cell also includes a current monitoring device for monitoring the magnitude of the current in the electrode chamber (110); Step two is achieved through the following method: S21. Monitor the magnitude I of the current in the electrode chamber (110) through the current monitoring device, and proceed to S22; S22. The control system determines whether the current magnitude I is lower than I0. If yes, proceed to S23; otherwise, return to S21. S23. The control system determines whether the broken network segment (41) has been shortened to the limit state. If yes, proceed to S25; otherwise, proceed to S24. S24. Drive the folding segment (41) through the driving mechanism (5) to shorten it by a certain length, and return to S21; S25. Turn off the constant voltage power supply, stop the supply of electrolyte and soft water, and remind the user to replenish electrolyte.

7. The control method according to claim 3, characterized in that: The first end of the folded mesh segment (41) is fixed relative to the groove (1), and the power output end of the driving mechanism (5) is connected to the second end of the folded mesh segment (41) so that the second end of the folded mesh segment (41) moves along the extension and retraction direction of the folded mesh segment (41) to adjust the extension and retraction of the folded mesh segment (41).

8. The control method according to claim 7, characterized in that: The insulating mesh (4) further includes a flat mesh section (42), which is flat and has multiple second mesh holes (421) for fluid to pass through. The first end of the flat mesh section (42) is connected to the trough (1) through a rotating shaft (422), and the second end is connected to the second end of the folded mesh section (41). The orthographic projection area of ​​the folded mesh segment (41) on the diaphragm (2) is denoted as S1, and the orthographic projection area of ​​the flat mesh segment (42) on the diaphragm (2) is denoted as S2. The flat mesh segment (42) is wound on the rotating shaft (422) and can be unwound during the compression of the folded mesh segment (41) so that the sum of S1 and S2 remains unchanged.

9. The control method according to claim 8, characterized in that: The drive mechanism (5) includes: A scroll (51) is located on the outside of the groove (1); A pull rope (52), with its first end connected to the reel (51) and its second end passing through the groove (1) and extending into the corresponding electrode chamber (110) and confined at the second end of the folded mesh section (41), is wound around the reel (51) and can be unwound or wound up; and A drive unit (53) is located on the outside of the groove (1), and its power output end is connected to the spool (51) to drive the spool (51) to rotate around its own axis.

10. The control method according to claim 9, characterized in that: The drive mechanism (5) also includes A first magnetic block (54) is disposed at the second end of the pull rope (52); and The second magnetic block (55) is fixed relative to the groove (1) and can be attracted to the first magnetic block (54); In step one, in the initial state, the first magnetic block (54) and the second magnetic block (55) are attracted to each other, and the folded mesh segment (41) is stretched to its limit. In step two, in the final state, the first magnetic block (54) and the second magnetic block (55) are separated from each other, and the folded mesh segment (41) is shortened to its limit.

11. The control method according to claim 10, characterized in that: The second magnetic block (55) is arranged close to the rotating shaft (422); In step one, in the initial state, the flat mesh segment (42) is completely rolled up on the rotating shaft (422); In step two, in the final state, the flat section (42) is completely unwound from the rotating shaft (422).

12. The control method according to any one of claims 3 to 11, characterized in that: The folded mesh segment (41) includes at least two unit strips (411) arranged sequentially along its length. Each unit strip (411) has multiple first mesh holes (4111) for fluid to pass through. The odd-numbered unit strip (411) in the arrangement direction is designated as the first unit strip (411a), and the even-numbered unit strip (411) in the arrangement direction is designated as the second unit strip (411b). The first side of the preceding first unit strip (411a) is connected to the first side of the following second unit strip (411b), and the second side of the preceding second unit strip (411b) is connected to the second side of the following first unit strip (411a). Adjacent unit strips (411) have an included angle and can be opened and closed relative to each other.

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