Inner sealing structure based on square electrolytic cell pole frame

Abstract

The invention discloses an inner sealing structure based on a square electrolytic cell pole frame, and relates to the technical field of electrochemical device sealing, the inner sealing structure comprises a pole frame body, the pole frame body comprises an assembly slot, the assembly slot is formed in the inner wall of the pole frame body, and when the device runs to generate vibration or the pole frame body and a pole plate piece have slight structural deformation, the assembly slot is inserted into the assembly slot. The shrinkage preset groove of the wedge-shaped sealing part of the sealing strip can be quickly unfolded by virtue of self elastic restoring force, the side surface of the wedge-shaped sealing part is pushed to be continuously attached to the side surface of the polar plate piece, and a dynamically generated sealing gap is filled in real time; meanwhile, a contraction inner groove in the extension insertion part can provide a tiny deformation space for the extension insertion part, the extension insertion part is prevented from being separated from the wedge-shaped sealing groove due to vibration, and stable support is provided for the wedge-shaped sealing part; in addition, the outer sealing strip can always keep elastic contact with the side face of the polar plate piece, the rubber material of the outer sealing strip can further absorb vibration energy, the wedge-shaped sealing part is assisted to seal the gap of the outer side face, and elastic covering of the wedge-shaped sealing part is formed.

Description

Technical Field

[0001] This invention relates to the field of sealing technology for electrochemical devices, specifically to an internal sealing structure based on a square electrolytic cell electrode frame. Background Technology

[0002] In electrochemical devices such as water electrolysis for hydrogen production, fuel cells, and flow batteries, the electrode frame is one of the core structural components. It is used to support the electrodes, distribute the reaction medium, and form a sealed cavity. Traditional electrode frames are mostly made of metal materials, which have problems such as heavy weight, easy corrosion, and high cost.

[0003] With the development of technology, non-metallic materials (such as engineering plastics and composite materials) have gradually become the ideal choice for manufacturing pole frames due to their advantages such as corrosion resistance, lightweight, and low cost. However, there is a significant difference in the coefficient of thermal expansion between non-metallic materials and the internally embedded metal base plate or other functional components (i.e., thermal mismatch). Under the temperature cycling conditions of the device operation, this thermal mismatch will generate huge thermal stress, causing the non-metallic frame to creep or deform, thereby causing the traditional planar compression seal to fail and triggering internal media leakage. Internal leakage will not only reduce the efficiency of the device, but may also lead to safety accidents.

[0004] In the prior art, such as Chinese Patent Publication No. CN108796539B, an electrode sealing frame for an electrolyzer is disclosed, including a cathode sealing frame and an anode sealing frame. Both the cathode and anode sealing frames have inlets and outlets, which are centrally symmetrical. Each cathode and anode sealing frame has an even number of bolt fastening holes, which are also centrally symmetrical, with a solid area between each pair of bolt fastening holes. The inlet and outlet of the anode sealing frame are provided with flow-diverting reinforcing ribs to prevent damage from compression. Both the cathode and anode sealing frames have sealing protrusions to enhance sealing. This invention provides an excellent channel for both water and gas paths. The cathode electrode sealing frame has a gas outlet, reducing subsequent separation processes. Furthermore, through its internal structural design, it increases current density, reduces energy consumption, and significantly improves hydrogen production efficiency.

[0005] In existing technologies, the common methods to compensate for this are to apply greater bolt preload or use softer sealing materials. However, this can accelerate material creep and even crush non-metallic frames. When sealing strips are directly embedded into the gaps between the electrode plates and the electrode frames, since the sealing strips are mostly made of rubber, they can deform or even be damaged due to temperature changes and liquid erosion inside the electrolytic cell. Often, the operator can only detect this when there is leakage in the gaps between the electrode frames, which is not conducive to long-term use.

[0006] Therefore, we propose an internal sealing structure based on the square electrolytic cell electrode frame to solve the problems mentioned in the background art. Summary of the Invention

[0007] The purpose of this invention is to provide an internal sealing structure based on a square electrolytic cell electrode frame, in order to solve the problems mentioned in the background art. Existing methods, such as applying greater bolt preload or using softer sealing materials, are used to compensate for these issues. However, this accelerates material creep and may even crush the non-metallic frame. When sealing strips are directly embedded into the assembly gap between the electrode plate and the electrode frame, since the sealing strips are mostly made of rubber, they can deform or even be damaged due to temperature changes and liquid erosion inside the electrolytic cell. Often, the operator can only detect the leakage when there is seepage or leakage in the gap of the electrode frame, which is not conducive to long-term use.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an inner sealing structure based on a square electrolytic cell electrode frame, comprising: an electrode frame body, wherein the electrode frame body comprises:

[0009] An assembly slot is provided on the inner wall of the pole frame body and is used to insert a pole plate.

[0010] A wedge-shaped sealing groove is formed on the upper end of the inner wall of the assembly slot, and the wedge-shaped sealing groove extends inward to form a wedge-shaped extension groove.

[0011] A sealing strip is inserted inside the wedge-shaped sealing groove, and the sealing strip includes:

[0012] The outer sealing strip is a rubber strip structure and is fixedly installed on the side of the sealing strip away from the pole frame body. The outer sealing strip is used to seal the outer side of the sealing strip and the assembly slot.

[0013] Side insert, the side insert is fixedly installed on the side of the outer sealing strip near the main body of the sealing strip, and the far end of the outer sealing strip and the sealing strip are separate structures;

[0014] A wedge-shaped sealing part is fixedly disposed on the top of the sealing strip, and the interior of the wedge-shaped sealing part is provided with a shrinkage preset groove in a linear array;

[0015] An extension insertion part is fixedly disposed in the sealing strip on the side near the assembly slot. The extension insertion part has a shrinkage groove inside, and a piezoelectric ceramic sheet is inserted into the shrinkage groove.

[0016] Preferably, the piezoelectric ceramic sheet is composed of multiple piezoelectric ceramic sheets arranged along the height direction of the assembly slot, and the deformation direction of each group of piezoelectric ceramic sheets is perpendicular to the electrode frame sealing surface.

[0017] Preferably, the polar frame body includes:

[0018] The connecting plate is provided in two places, and the two connecting plates are fixedly connected to the front and rear sides of the pole frame body in opposite directions.

[0019] Connection holes are arranged in a linear array within the connection plate.

[0020] Preferably, the mounting slot includes:

[0021] An insertion end, located on the right side of the assembly slot, is used to guide the insertion of the electrode plate.

[0022] There are four wedge-shaped sealing grooves, which are arranged in a ring array on the four sides of the inner wall of the pole frame body. Corner sealing blocks are inserted into the assembly slot.

[0023] Preferably, the corner sealing block includes;

[0024] The positioning groove 201 is formed at the bottom of the corner sealing block. The lower part of the positioning groove 201 is a through structure. There are four corner sealing blocks, which are respectively fixedly connected to the four corners inside the assembly slot.

[0025] Preferably, a sealing gasket is inserted inside the assembly slot, the sealing gasket is inserted through the insertion end, and the bottom of the sealing gasket is in contact with the inner bottom surface of the assembly slot.

[0026] Preferably, the electrode is inserted into the assembly slot and is located on the sealing gasket.

[0027] Preferably, the electrode plate is inserted into the positioning groove 201, and the electrode plate is located within the corner sealing block and the sealing gasket.

[0028] Preferably, the electrode plate includes:

[0029] An electrode baffle is fixedly connected to the side of the electrode assembly away from the electrode frame body. The electrode baffle is used to seal the gap between the electrode assembly and the insertion end in the electrode frame body.

[0030] Preferably, the polar frame body includes:

[0031] The side sealing groove is provided in four places. The four side sealing grooves are arranged in a ring array on the four sides of the inner wall of the pole frame body, and the side sealing grooves are located above the assembly slots. The side sealing grooves are used for the insertion of side inserts.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. When the present invention is used, when the temperature cycle during device operation causes a difference in the thermal expansion coefficients between the electrode frame body and the electrode plate, the piezoelectric ceramic sheet in the extension insertion part of the sealing strip will deform in a direction perpendicular to the sealing surface of the electrode frame. This deformation force directly pushes the extension insertion part to move towards the sealing gap. At the same time, under the thrust of the extension insertion part, the wedge-shaped sealing part at the top of the sealing strip will adaptively shrink the linear array of pre-contraction grooves inside, so that the wedge-shaped sealing part tightly fits the wedge-shaped sealing groove of the electrode frame body and the inner wall of the wedge-shaped extension groove, accurately filling the gap caused by thermal mismatch. In addition, the outer sealing strip (rubber strip structure) on the outside of the sealing strip will undergo elastic deformation simultaneously, further sealing the outer side of the sealing strip and the assembly slot, forming a multi-component linkage sealing mechanism driven by the piezoelectric ceramic sheet, conducted by the extension insertion part, filled by the wedge-shaped sealing part, and assisted by the outer sealing strip. This completely avoids the problem of sealing surface separation caused by thermal stress in traditional technology, and does not require excessive bolt pre-tightening force, effectively protecting the non-metallic electrode frame body from crushing or creep damage.

[0034] 2. In use, the outer sealing strip and the main body of the sealing strip are designed separately, and the side insert of the outer sealing strip near the main body of the sealing strip enhances the connection stability between the two. When the temperature inside the electrolytic cell changes drastically, the outer sealing strip will undergo local deformation due to the properties of the rubber material. The separate structure ensures that this deformation is limited to the outer sealing strip itself and will not be transmitted to the wedge-shaped sealing part and the extended insertion part of the sealing strip, thus avoiding overall deformation and damage to the sealing strip. If it encounters internal liquid erosion, the outer sealing strip will preferentially contact the corrosive liquid, forming the first protective barrier to protect the piezoelectric ceramic sheet and the wedge-shaped sealing part in the extended insertion part from direct erosion. At the same time, the shrinkage preset groove of the wedge-shaped sealing part can absorb the small deformation of the outer sealing strip caused by erosion in real time, ensuring that the wedge-shaped sealing part always fits the wedge-shaped sealing groove, forming a linkage protection system of outer sealing strip protection, side insert stabilization, and wedge-shaped sealing part compensation. This solves the problem that traditional integral sealing strips are easily damaged by temperature and erosion and leaks are difficult to detect, thus extending the service life of the sealing structure.

[0035] 3. When the device vibrates or the electrode frame or electrode plate undergoes slight structural deformation during operation, the pre-set groove of the wedge-shaped sealing part of the sealing strip will quickly expand due to its own elastic recovery force, pushing the side of the wedge-shaped sealing part to continuously adhere to the side of the electrode plate, filling the dynamically generated sealing gap in real time. At the same time, the shrinkage groove inside the extension insertion part will provide a small deformation space for the extension insertion part, preventing the extension insertion part from detaching from the wedge-shaped sealing groove due to vibration, and providing stable support for the wedge-shaped sealing part. In addition, the outer sealing strip will always maintain elastic contact with the side of the electrode plate, and its rubber material can further absorb vibration energy, assisting the wedge-shaped sealing part in sealing the gap on the outer side. This forms a dynamic sealing linkage mechanism of elastic filling of the wedge-shaped sealing part, support and limit of the extension insertion part, and energy absorption assistance of the outer sealing strip, solving the problem that traditional static sealing cannot adapt to dynamic gaps and ensuring the long-term stable operation of devices such as water electrolysis hydrogen production and fuel cells. Attached Figure Description

[0036] Figure 1 This is a front perspective view of the disassembled inner sealing structure of the square electrolytic cell electrode frame of the present invention.

[0037] Figure 2 This is a schematic diagram of the combination of the electrode frame body and the wedge-shaped sealing groove in the inner sealing structure of the square electrolytic cell electrode frame of the present invention;

[0038] Figure 3 This is a schematic diagram of the combination of the sealing strip and the outer sealing strip in the inner sealing structure based on the square electrolytic cell electrode frame of the present invention;

[0039] Figure 4 This is a rear-axis perspective view of the combined internal sealing structure based on the square electrolytic cell electrode frame of the present invention.

[0040] Figure 5 This is a perspective view of the electrode frame body and connecting plate assembly based on the inner sealing structure of the square electrolytic cell electrode frame of the present invention.

[0041] Figure 6 This is a perspective view of the connection between the electrode frame body and the sealing strip in the inner sealing structure of the square electrolytic cell electrode frame of the present invention.

[0042] Figure 7 This is a schematic diagram showing the deformation direction of the piezoelectric ceramic sheet in the inner sealing structure of the square electrolytic cell electrode frame of the present invention.

[0043] Figure 8 This is a front view of the disassembled inner sealing structure of the square electrolytic cell electrode frame of the present invention;

[0044] In the figure: 1. Pole frame body; 101. Connecting plate; 1011. Connecting hole; 1012. Assembly slot; 1013. Wedge-shaped sealing groove; 10131. Wedge-shaped extension groove; 10132. Side sealing groove; 10121. Insertion end; 2. Corner sealing block; 201. Positioning groove 201; 2011. Sealing gasket; 2012. Pole plate component; 20121. Pole plate baffle; 3. Sealing strip; 301. Outer sealing strip; 3011. Side insert strip; 3012. Wedge-shaped sealing part; 30121. Shrinkage preset groove; 3013. Extension insertion part; 30131. Shrinkage inner groove; 30132. Piezoelectric ceramic sheet. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Example

[0047] Please see Figures 1-8 As shown, the present invention provides a technical solution: an inner sealing structure based on a square electrolytic cell electrode frame, comprising an electrode frame body 1, the electrode frame body 1 comprising:

[0048] The mounting slot 1012 is formed on the inner wall of the pole frame body 1 and is used to insert the pole plate 2012.

[0049] The wedge-shaped sealing groove 1013 is formed on the upper end of the inner wall of the assembly slot 1012, and the wedge-shaped sealing groove 1013 extends inward to form a wedge-shaped extension groove 10131.

[0050] A sealing strip 3 is inserted inside the wedge-shaped sealing groove 1013. The sealing strip 3 includes:

[0051] The outer sealing strip 301 is a rubber strip structure, and the outer sealing strip 301 is fixedly installed on the side of the sealing strip 3 away from the pole frame body 1, and the outer sealing strip 301 is used to seal the outer side of the sealing strip 3 and the assembly slot 1012.

[0052] Side insert 3011, the side insert 3011 is fixedly installed on the side of the outer sealing strip 301 near the main body of the sealing strip 3, and the far end of the outer sealing strip 301 and the sealing strip 3 are separate structures;

[0053] The wedge-shaped sealing part 3012 is fixedly disposed on the top of the sealing strip 3. The interior of the wedge-shaped sealing part 3012 is provided with shrinkage preset grooves 30121 in a linear array.

[0054] An extension insertion part 3013 is fixedly disposed in the sealing strip 3 on the side near the assembly slot 1012. The extension insertion part 3013 has a shrinkage inner groove 30131 inside, and a piezoelectric ceramic sheet 30132 is inserted into the shrinkage inner groove 30131. The electrode plate 2012 is inserted and assembled through the assembly slot 1012 on the electrode frame body 1. The wedge-shaped sealing groove 1013 and the wedge-shaped extension groove 10131 provide installation space for the sealing strip 3. The outer sealing strip 301 of the sealing strip 3 can seal its outer side with the assembly slot 1012. The shrinkage preset groove 30121 of the wedge-shaped sealing part 3012 is convenient to adapt to the sealing gap. The piezoelectric ceramic sheet 30132 in the extension insertion part 3013 creates conditions for sealing compensation. The overall structure of the electrode frame body 1 and the electrode plate 2012 is constructed, laying the foundation for solving the problem of easy failure of traditional seals.

[0055] The piezoelectric ceramic sheet 30132 is composed of multiple piezoelectric ceramic sheets arranged along the height direction of the assembly slot 1012. The deformation direction of each group of piezoelectric ceramic sheets 30132 is perpendicular to the electrode frame sealing surface. By designing the piezoelectric ceramic sheet 30132 as multiple piezoelectric ceramic sheets arranged along the height direction of the assembly slot 1012 and with the deformation direction perpendicular to the electrode frame sealing surface, it can be ensured that the piezoelectric ceramic sheet 30132 deforms precisely towards the sealing surface when thermal stress is generated by thermal mismatch, effectively compensating for the sealing gap and avoiding sealing failure caused by thermal stress.

[0056] The polar frame body 1 includes:

[0057] The connecting plate 101 is provided in two places, and the two connecting plates 101 are fixedly connected to the front and rear sides of the pole frame body 1 in opposite directions.

[0058] The connecting holes 1011 are arranged in a linear array within the connecting plate 101. By setting two opposing and fixed connecting plates 101 on the front and rear sides of the electrode frame body 1 and opening the connecting holes 1011 in a linear array on the connecting plate 101, it is convenient to connect the electrode frame body 1 with other components, ensuring the overall assembly firmness of the electrolytic cell and providing stable assembly support for the sealing structure.

[0059] The assembly slot 1012 includes:

[0060] Insertion end 10121 is located on the right side of assembly slot 1012 and is used to guide the insertion of electrode plate 2012;

[0061] There are four wedge-shaped sealing grooves 1013. The four wedge-shaped sealing grooves 1013 are arranged in a ring array on the four sides of the inner wall of the pole frame body 1. An edge sealing block 2 is inserted into the assembly slot 1012. By setting an insertion end 10121 on the right side of the assembly slot 1012 to guide the pole plate 2012 to be inserted smoothly, the four wedge-shaped sealing grooves 1013 are arranged in a ring array on the four sides of the inner wall of the pole frame body 1 to achieve four-sided sealing. At the same time, the edge sealing block 2 is inserted into the assembly slot 1012 to supplement the sealing at the edge and corner positions and reduce the risk of leakage at the edge and corner gaps.

[0062] The corner sealing block 2 includes:

[0063] The positioning groove 201 is located at the bottom of the corner sealing block 2. The lower part of the positioning groove 201 is a through structure. The corner sealing block 2 has four corners, which are fixedly connected to the four corners inside the assembly slot 1012. By opening the positioning groove 201 at the bottom of the corner sealing block 2 and fixing the four corner sealing blocks 2 to the four corners inside the assembly slot 1012, the positioning groove 201 can accurately position the electrode plate 2012. The corner sealing blocks 2 at the four corners can specifically seal the corners that are prone to leakage, thereby improving the sealing reliability at the corners.

[0064] A sealing gasket 2011 is inserted into the assembly slot 1012. The sealing gasket 2011 is inserted through the insertion end 10121, and the bottom of the sealing gasket 2011 is in contact with the inner bottom surface of the assembly slot 1012. By inserting the sealing gasket 2011 inserted through the insertion end 10121 into the assembly slot 1012, and with the bottom of the sealing gasket 2011 in contact with the inner bottom surface of the assembly slot 1012, the gap between the inner bottom surface of the assembly slot 1012 and the electrode plate 2012 can be filled, forming a bottom sealing barrier to prevent the internal medium from leaking from the bottom of the assembly slot 1012.

[0065] In this configuration, the electrode plate 2012 is inserted into the assembly slot 1012 and sits on the sealing gasket 2011. By inserting the electrode plate 2012 into the assembly slot 1012 and placing it on the sealing gasket 2011, the electrode plate 2012 and the sealing gasket 2011 are in close contact. The sealing effect of the sealing gasket 2011 is further enhanced to improve the sealing effect at the bottom of the electrode plate 2012, thus preventing gap leakage between the electrode plate 2012 and the inner bottom surface of the assembly slot 1012.

[0066] The electrode plate 2012 is inserted into the positioning groove 201. The electrode plate 2012 is located within the corner sealing block 2 and the sealing gasket 2011. By inserting the electrode plate 2012 into the positioning groove 201 and placing it between the corner sealing block 2 and the sealing gasket 2011, the positioning groove 201 ensures the accurate installation position of the electrode plate 2012. The corner sealing block 2 and the sealing gasket 2011 form a wrap-around seal on the electrode plate 2012 from both the corner and bottom directions, greatly improving the sealing integrity.

[0067] Among them, electrode plate 2012 includes:

[0068] The electrode baffle 20121 is fixedly connected to the side of the electrode plate 2012 away from the electrode frame body 1. The electrode baffle 20121 is used to seal the gap between the electrode plate 2012 and the insertion end 10121 opened in the electrode frame body 1. By fixing the electrode baffle 20121 to the side of the electrode plate 2012 away from the electrode frame body 1, the gap between the electrode plate 2012 and the insertion end 10121 of the electrode frame body 1 can be directly sealed, preventing the internal medium from leaking from the opening position of the insertion end 10121, and supplementing the seal of the insertion end 10121 to form a complete sealing loop.

[0069] The polar frame body 1 includes:

[0070] The side sealing groove 10132 is provided in four places. The four side sealing grooves 10132 are arranged in a ring array on the four sides of the inner wall of the pole frame body 1 and are located above the assembly slot 1012. The side sealing grooves 10132 are used for the insertion of the side insert 3011. By opening four side sealing grooves 10132 in a ring array on the four sides of the inner wall of the pole frame body 1 and located above the assembly slot 1012 for the insertion of the side insert 3011, the side seal between the sealing strip 3 and the pole frame body 1 can be strengthened, the medium can be prevented from leaking from the gap between the side of the sealing strip 3 and the pole frame body 1, and the overall sealing performance can be improved.

[0071] When in use, the operator first places the electrode frame body 1 flat on the assembly platform, ensuring that the opening of the assembly slot 1012 on its inner wall faces upward and the insertion end 10121 faces the operating side. First, process the connecting plate 101 of the electrode frame body 1: take two connecting plates 101 and align them with the preset connection positions on the front and rear sides of the electrode frame body 1 respectively. Achieve opposite connection by welding or bolting. The connecting holes 1011 in a straight array on the connecting plate 101 must be kept horizontally aligned. Subsequently, the electrode frame body 1 can be fixed to other parts of the electrolytic cell by passing bolts through the connecting holes 1011 to avoid displacement of the electrode frame during operation, which would cause misalignment of the sealing surface.

[0072] Next, take the four corner sealing blocks 2 and observe the positioning grooves 201 opened at their bottom. The lower part of the positioning grooves 201 is a through structure, which facilitates the positioning when the electrode plate 2012 is inserted. Align each corner sealing block 2 with the corner position inside the assembly slot 1012. During assembly, it is necessary to ensure that the outer side of the corner sealing block 2 is tightly fitted with the inner wall of the assembly slot 1012. Fix it by adhesive or snap fastener. The snap fastener must be snapped into the pre-set slot of the electrode frame body to prevent the corner sealing blocks from shifting when the electrode plate is inserted later. At this time, the positioning grooves 201 of the four corner sealing blocks 2 form a "rectangular positioning channel". When the electrode plate 2012 is inserted later, it can be accurately positioned along this channel to avoid sealing gaps caused by electrode plate offset. At the same time, the corner sealing block 2 is made of corrosion-resistant elastic material, which can initially buffer the difference in thermal expansion and contraction between the electrode frame and the electrode plate.

[0073] Next, take the sealing gasket 2011 and match its edge with the inner wall contour of the assembly slot 1012. Slowly push it in from the insertion end 10121 of the assembly slot 1012. During the pushing process, the sealing gasket 2011 should be kept horizontal to avoid local wrinkles caused by tilting. Continue until the bottom of the sealing gasket 2011 is completely in contact with the inner bottom surface of the assembly slot 1012. At this time, the upper surface of the sealing gasket 2011 remains flat. After the electrode plate 2012 is inserted, it can make close contact with the lower surface of the electrode plate 2012 to seal the gap between the electrode plate 2012 and the bottom of the assembly slot 1012. Traditional seals often ignore the bottom gap, which can easily lead to the leakage of the medium from the bottom of the tank. This step uses the sealing gasket 2011 to pre-install and build a bottom sealing barrier in advance.

[0074] The combination of piezoelectric ceramic sheet 30132 and extension insertion part 3013 is taken from the sealing strip 3. Observe the extension insertion part 3013 on the side near the assembly slot 1012. The inside of this part is provided with a shrinkage groove 30131 to accommodate the piezoelectric ceramic sheet 30132 and reserve deformation space. Take multiple piezoelectric ceramic sheets to form the piezoelectric ceramic sheet 30132. Insert them one by one into the shrinkage groove 30131 along the height direction of the assembly slot 1012. When inserting, it is necessary to use a calibration tool to ensure that the deformation direction of each group of piezoelectric ceramic sheets 30132 is perpendicular to the electrode frame sealing surface. This is the key to accurate gap filling during subsequent thermal mismatch: if the deformation direction is off, it will cause the extension insertion part 3013 to move in the non-sealing direction, which will create a gap. After the piezoelectric ceramic sheet 30132 is fully inserted, its two ends need to make slight contact with the inner wall of the shrinkage groove 30131 without interference fit to avoid damage to the piezoelectric ceramic sheet 30132 due to compression in the initial state, and at the same time ensure that the extension insertion part 3013 can be effectively pushed during deformation.

[0075] Align the pre-installed piezoelectric ceramic sheet 30132 and the sealing strip 3 of the outer sealing strip 301 together with the wedge-shaped sealing groove 1013 on the inner wall of the electrode frame body 1. The four wedge-shaped sealing grooves 1013 are arranged in a ring array on the four sides of the inner wall of the electrode frame. First, slowly insert the extension insertion part 3013 into the bottom of the wedge-shaped sealing groove 1013, ensuring that the outer wall of the extension insertion part 3013 fits against the inner wall of the wedge-shaped sealing groove 1013. Then, push the wedge-shaped sealing part 3012 at the top of the sealing strip 3 so that it moves along the inclination of the wedge-shaped sealing groove 1013. The wedge-shaped sealing part 3012 slides along the inclined inner wall until it is fully engaged with the wedge-shaped sealing groove 1013 and the wedge-shaped extension groove 10131 extending inward. The wedge-shaped extension groove 10131 needs to reserve 1-2 mm of deformation space for the wedge-shaped sealing part 3012 to prevent the wedge-shaped sealing part 3012 from breaking due to limited space during subsequent thermal deformation or dynamic extrusion. At the same time, the shrinkage preset grooves 30121 arranged in a linear array inside the wedge-shaped sealing part 3012 need to remain in a naturally open state to reserve elastic recovery capacity for subsequent gap filling.

[0076] Then, align one edge of the electrode plate 2012 with the insertion end 10121 of the assembly slot 1012 and insert it slowly into the assembly slot 1012. During the insertion process, the lower surface of the electrode plate 2012 first contacts the upper surface of the pre-installed sealing gasket 2011. As the insertion depth increases, the four corners of the electrode plate 2012 gradually enter the positioning grooves 201 of the four corner sealing blocks 2. The through-type lower part design of the positioning groove 201 can avoid air blockage between the bottom of the electrode plate 2012 and the sealing gasket 2011, ensuring that the lower surface of the electrode plate 2012 is completely in contact with the sealing gasket 2011, achieving bottom sealing. Continue to push the electrode plate 2012 until the side away from the insertion end 10121 contacts the inner wall of the assembly slot 1012. At this time, the electrode plate 2012 is in a stable state of "bottom supported by sealing gasket 2011 and four corners limited by positioning groove 201", with no risk of lateral displacement.

[0077] After the outer sealing strip 301 and the electrode baffle 20121 are in place, the two sides of the electrode 2012 will come into close contact with the outer sealing strip 301 of the sealing strip 3 and be squeezed. The rubber material of the outer sealing strip 301 undergoes elastic deformation, and its surface completely adheres to the side of the electrode 2012 and the inner wall of the assembly slot 1012, forming the first side seal. At the same time, the compression of the outer sealing strip 301 will indirectly push the sealing strip 3 as a whole to move slightly towards the inside of the wedge-shaped sealing groove 1013, so that the inclined surface of the wedge-shaped sealing part 3012 is further in contact with the side of the electrode 2012. The shrinkage preset groove 30121 inside the wedge-shaped sealing part 3012 shrinks slightly due to the compression, forming the second side seal. The two side seals can avoid leakage caused by the failure of a single seal.

[0078] A plate baffle 20121 is fixedly connected to the side of the plate component 2012 away from the plate frame body 1. When the plate component 2012 is fully inserted, the plate baffle 20121 will naturally cover the opening of the insertion end 10121. Its edge is tightly fitted with the outer wall of the plate frame body 1, sealing the gap between the plate component 2012 and the insertion end 10121. Traditional seals often ignore the gap of the insertion end 10121, which can easily lead to leakage of the medium from the opening. This step forms a "plug-type seal" of the insertion end 10121 through the physical shielding of the plate baffle 20121.

[0079] When temperature cycling causes a difference in the coefficients of thermal expansion between the non-metallic electrode frame 1 and the metal electrode plate 2012, the electrode frame 1 is prone to creep, resulting in a gap on the sealing surface. At this time, the piezoelectric ceramic sheet 30132 in the extension insertion part 3013 of the sealing strip 3 will deform due to temperature changes or receiving external temperature control signals. Its deformation direction is perpendicular to the sealing surface of the electrode frame, and the deformation force directly pushes the extension insertion part 3013 to move towards the sealing gap. The movement of the extension insertion part 3013 will drive the sealing strip 3 as a whole to move towards the electrode plate 2012. In this process, the wedge-shaped sealing part 3012 is subjected to continuous thrust, and the internal shrinkage preset groove 30121 will shrink adaptively, pushing the inclined surface of the wedge-shaped sealing part 3012 to completely fill the gap caused by thermal mismatch. At the same time, the outer sealing strip 301 will maintain elastic deformation to prevent the gap from overflowing from the side. The whole process does not require increasing the bolt preload as in traditional technology, which could easily crush the non-metallic pole frame. Instead, it actively compensates for the thermal mismatch gap and protects the pole frame body 1 from damage through the linkage of "piezoelectric ceramic sheet 30132 driving → extension insertion part 3013 conducting → wedge-shaped sealing part 3012 filling the gap".

[0080] The protective linkage of the split outer sealing strip 301: When there are drastic temperature fluctuations inside the electrolytic cell, the outer sealing strip 301 undergoes localized deformation due to the properties of its rubber material. Since it is a split structure from the main sealing strip 3, connected only by the side insert 3011, this deformation is limited to the outer sealing strip 301 itself and will not be transmitted to the wedge-shaped sealing part 3012 and the extended insert 3013, thus preventing the sealing strip 3 from breaking due to localized deformation. At the same time, the shrinkage preset groove 30121 of the wedge-shaped sealing part 3012 will absorb the slight deformation of the electrode frame and electrode plate in real time, filling any gaps that may occur in advance, without waiting for seepage or leakage. Traditional seals only detect leaks after they occur. However, if the seal is corroded by internal liquid, the outer sealing strip 301, as the outer layer of seal, will preferentially contact the liquid. Its corrosion-resistant material can temporarily block liquid penetration and protect the piezoelectric ceramic sheet 30132 inside the extended insertion part 3013 from liquid damage. The side insert 3011 strengthens the connection between the outer sealing strip 301 and the main body of the sealing strip 3, preventing the outer sealing strip 301 from falling off due to immersion. This forms a damage-resistant system of "outer sealing strip 301 protection → side insert 3011 stabilization → wedge-shaped sealing part 3012 pre-filling gaps", solving the problem of traditional sealing strip 3 being easily damaged and leaks being difficult to detect.

[0081] The synergistic buffering of elastic components: When vibrations occur during the operation of the electrolytic cell, such as pump operation, pipeline transport vibration, or slight structural deformation of the electrode frame body 1, a dynamic gap will be generated on the sealing surface. At this time, the shrinkage preset groove 30121 of the wedge-shaped sealing part 3012 adjusts in real time according to the gap size by means of elastic restoring force. When the gap increases, the shrinkage preset groove 30121 expands and pushes the wedge-shaped sealing surface to fit the electrode plate; when the gap decreases, the shrinkage preset groove 30121 shrinks to avoid excessive compression. The shrinkage inner groove 30131 inside the extended insertion part 3013 will generate slight deformation to absorb the vibration impact force. At the same time, the wedge-shaped sealing groove 1013 limits the extended insertion part 3013 to ensure that it does not detach from the groove, thus providing a wedge seal. Part 3012 provides stable support; the outer sealing strip 301, through the vibration-absorbing properties of rubber, reduces the impact of vibration on the sealing surface and maintains contact with the side of the electrode plate 2012. This linkage of "elastic gap filling of wedge-shaped sealing part 3012 → support and limit of extended insertion part 3013 → vibration absorption and buffering of outer sealing strip 301" completely eliminates the dependence of traditional sealing on initial clamping force. Even if vibration causes the initial clamping force to decay, it can still maintain the contact of the sealing surface, solving the problem of gap inability to adapt under dynamic working conditions. The working principle of the piezoelectric ceramic sheet 30132 is as follows: the main component of piezoelectric ceramic is a ferroelectric crystal (such as barium titanate, lead zirconate titanate, etc.), and its microstructure is composed of a large number of tiny "electric domains". When no power is applied: the spontaneous polarization direction of the domains (which can be understood as the "positive and negative polarity direction of the domains") is randomly arranged. The polarization effects of different domains cancel each other out. Therefore, the piezoelectric ceramic as a whole does not exhibit macroscopic deformation or polarity. When power is applied (an external electric field is applied): when a DC electric field is applied to a specific direction of the ceramic (usually its "polarization direction", that is, the direction of pre-polarization treatment during production), the chaotic domains will be affected by the electric field force and spontaneously rotate and align in the direction of the electric field (similar to a small magnet turning in the direction of the magnetic field). When the domains are arranged in a large number and orderly along the direction of the electric field, it will cause macroscopic elongation deformation of the ceramic in the direction of the electric field (i.e., "thickening"). If the direction of the electric field is perpendicular to the surface of the ceramic sheet, the thickness will increase.

[0082] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An inner sealing structure based on a square electrolytic cell pole frame, comprising a pole frame body (1), characterized in that, The polar frame body (1) comprises: The assembly slot (1012) is opened in the inner wall of the polar frame body (1), and the assembly slot (1012) is used for inserting the polar plate piece (2012); The wedge-shaped sealing groove (1013) is opened on the inner wall of the assembly slot (1012) on the upper end, and the wedge-shaped sealing groove (1013) extends inwardly to form a wedge-shaped extension groove (10131); The inside of the wedge-shaped sealing groove (1013) is provided with a sealing strip (3), and the sealing strip (3) comprises: The outer sealing strip (301) is a rubber strip structure, and the outer sealing strip (301) is fixedly arranged on the side of the sealing strip (3) away from the polar frame body (1), and the outer sealing strip (301) is used for sealing the outer side of the sealing strip (3) and the assembly slot (1012); The side edge insertion strip (3011) is fixedly arranged on the side of the outer sealing strip (301) close to the main part of the sealing strip (3), and the outer sealing strip (301) is a split structure with the sealing strip (3) at the distal end; The wedge-shaped sealing part (3012) is fixedly arranged on the top of the sealing strip (3), and the inside of the wedge-shaped sealing part (3012) is linearly arrayed with a contraction preset groove (30121); The extension insertion part (3013) is fixedly arranged on the side of the sealing strip (3) close to the assembly slot (1012), and the inside of the extension insertion part (3013) is provided with a contraction inner groove (30131), and the inside of the contraction inner groove (30131) is inserted with a piezoelectric ceramic sheet (30132).

2. The inner seal structure based on square cell pole frame according to claim 1, characterized in that: The piezoelectric ceramic sheet (30132) is composed of a plurality of piezoelectric ceramic sheets arranged along the height direction of the assembly slot (1012), and the deformation direction of each group of piezoelectric ceramic sheets (30132) is perpendicular to the polar frame sealing surface.

3. The inner seal structure based on square cell polar frame according to claim 1, characterized in that: The polar frame body (1) comprises: The connecting plate (101) is provided with two places, and the two connecting plates (101) are fixedly connected to the front and rear sides of the polar frame body (1) in opposition; The connecting hole (1011) is linearly arrayed in the connecting plate (101).

4. The inner seal structure based on square cell polar frame of claim 1, wherein: The assembly slot (1012) comprises: The insertion end (10121) is located on the right side of the assembly slot (1012) and is used for guiding the insertion of the polar plate piece (2012); The wedge-shaped sealing groove (1013) is provided with four places, and the four wedge-shaped sealing grooves (1013) are annularly arrayed on the inner walls of the four sides of the polar frame body (1), and the edge corner sealing block (2) is inserted into the inside of the assembly slot (1012).

5. The inner seal structure based on square cell pole frame according to claim 4, characterized in that: The edge corner sealing block (2) comprises: Positioning groove (201), the positioning groove (201) is opened in the bottom end of the corner sealing block (2), the lower part of the positioning groove (201) is through structure, the corner sealing block (2) is provided with four, four corner sealing blocks (2) are respectively fixedly connected at the four corner positions inside the assembly slot (1012).

6. The inner seal structure based on square cell pole frame according to claim 1, characterized in that: The assembly slot (1012) is inserted with a sealing gasket (2011), the sealing gasket (2011) is inserted through the insertion end (10121), and the bottom of the sealing gasket (2011) is attached to the inner bottom end face of the assembly slot (1012).

7. The inner seal structure based on square cell polar frame according to claim 4, characterized in that: The polar plate piece (2012) is in the state of being inserted into the assembly slot (1012), and the polar plate piece (2012) is located on the sealing gasket (2011).

8. The inner seal structure based on square cell polar frame according to claim 7, characterized in that: The polar plate piece (2012) is inserted into the positioning groove (201), and the polar plate piece (2012) is located in the corner sealing block (2) and the sealing gasket (2011).

9. The inner seal structure based on square cell polar frame according to claim 8, characterized in that: The polar plate piece (2012) comprises: The polar plate baffle (20121) is fixedly connected to one side of the polar plate piece (2012) away from the polar frame body (1), and the polar plate baffle (20121) is used for sealing the gap between the polar plate piece (2012) and the insertion end (10121) in the polar frame body (1).

10. The inner seal structure based on square cell pole frame according to claim 1, characterized in that: The polar frame body (1) comprises: The side sealing groove (10132) is provided with four, four side sealing grooves (10132) are annularly arranged at the four side positions of the inner wall of the polar frame body (1), and the side sealing groove (10132) is located above the assembly slot (1012), and the side sealing groove (10132) is used for inserting the side insertion strip (3011).

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