Double-chamber electrolysis unit adopting high-performance polar plates

Abstract

A flow channel region of a cathode flow field of the double-chamber electrolysis unit at least comprises a cathode linear type flow channel region with a plurality of straight flow channels and a curve type flow channel region with a plurality of bent flow channels, and the cathode linear type flow channel region is uniformly arranged on the two sides of the curve type flow channel region; the length of the bent flow channel is 1.1-1.3 times that of the straight flow channel; by prolonging the path length of the electrolyte passing through the bent flow channel, the pressure drop of the electrolyte passing through the curved flow channel region is 1-2 times of the pressure drop of the electrolyte passing through the linear flow channel region of the cathode, and meanwhile, the overall pressure drop of a cathode flow field is also increased, so that the flow rate of hydrogen is reduced, and the hydrogen in the cathode flow channel is prevented from flowing out too fast; according to the invention, the electrolyte in the flow channel is ensured to be uniformly distributed, and the working stability of the electrolysis unit is ensured and the efficiency and the stability of the electrolysis unit are improved by optimizing the layout of the flow channel area and adding the design of the anode bent flow channel and the anode flow channel cut-off on the basis of the variable-diameter flow channel.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to a double-chamber electrolysis unit using high-performance polar plates. Background Art

[0002] With the increasing application of alkaline anion exchange membrane (AEM) water electrolysis hydrogen production technology in hydrogen energy production, the performance improvement of AEM electrolysis units is imminent. Among them, the plate, as one of the core components of the electrolysis unit, its innovative design and patent layout play a key role in improving the performance of the electrolysis unit and reducing production costs. The AEM electrolysis unit has attracted widespread attention due to its advantages such as simple operation and low dependence on precious metals. As an important component in the electrolysis unit, the plate has multiple functions such as conducting current, separating gases, and providing flow channels. Therefore, the design of the plate has a huge impact on the overall performance of the electrolysis unit.

[0003] Patent CN118407075A discloses a bipolar plate and an electrolytic cell. The bipolar plate anode flow channel adopts a variable diameter flow channel. By changing the local flow cross-sectional area of ​​the anode flow field of the bipolar plate of the PEM electrolytic cell, the local flow channel resistance is adjusted, thereby promoting the longitudinal mass transfer of the fluid, reducing the mass transfer polarization loss of the electrolytic cell, and improving the high-density electrolysis performance of the electrolytic cell.

[0004] The above patent still has room for improvement in the stability of the operation of the electrolysis unit and the control of the hydrogen output flow rate of the cathode. In view of this, it is necessary to design a plate with smaller voltage fluctuation and better stability. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a double-chamber electrolysis unit using high-performance plates in view of the deficiencies in the above-mentioned prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dual-chamber electrolysis unit using high-performance plates, the dual-chamber electrolysis unit at least includes a cathode plate with a cathode flow field and an anode plate with an anode flow field, the cathode monopolar plate has a cathode flow field, the anode monopolar plate has an anode flow field, and the bipolar plate has a cathode flow field and an anode flow field. The cathode flow field comprises a first electrolyte inlet, a first inlet distribution area, a first flow channel area, a first outlet distribution area and a first electrolyte outlet arranged in sequence along the flow direction of the electrolyte, the flow channel area of ​​the cathode flow field comprises a plurality of flow channels for electrolyte to pass through, the flow channel area of ​​the cathode flow field comprises at least a cathode linear flow channel area having a plurality of straight flow channels and a curved flow channel area having a plurality of bent flow channels, the cathode linear flow channel area is evenly arranged on both sides of the curved flow channel area; the length of the bent flow channel is 1.1-1.3 times the length of the straight flow channel; by extending the path length of the electrolyte passing through the bent flow channel, the pressure drop of the electrolyte flowing through the curved flow channel area is 1-2 times the pressure drop of the cathode linear flow channel area, and the overall pressure drop of the cathode flow field is also increased, so that the flow rate of hydrogen is reduced, and the hydrogen in the cathode flow channel is prevented from flowing out too quickly; The anode flow field includes a second electrolyte inlet, a second inlet distribution area, a second flow channel area, a second outlet distribution area and a second electrolyte outlet arranged in sequence along the electrolyte flow direction. The second flow channel area includes multiple flow channels for electrolyte to pass through. The second flow channel area at least includes an anode linear flow channel area with multiple direct current channels and a truncated distributed flow channel area with multiple multi-segment linear flow channels. The anode linear flow channel area is evenly arranged on both sides of the truncated distributed flow channel area; each of the multi-segment linear flow channels is composed of two flow channel ridges with multiple breakpoints evenly and symmetrically distributed; the electrolyte flow directions of the anode linear flow channel area and the cathode linear flow channel area are perpendicular to each other.

[0007] Preferably, the curved flow channel is a wavy line flow channel; the length of each breakpoint on the flow channel ridges on both sides of the multi-segment linear flow channel is not greater than the width of the multi-segment linear flow channel.

[0008] Preferably, the area of ​​the curved flow channel region accounts for 40%-60% of the area of ​​the first flow channel region.

[0009] Preferably, the channel width of the wavy channel decreases at the wave crests and / or wave troughs.

[0010] Preferably, the width of the wave-line flow channel at its wave crest and / or wave trough is not less than 70% of the width of the remaining flow channel positions.

[0011] Preferably, a boss with a height no greater than 1 / 3 of the height of the flow channel ridge is further provided in the multi-segment linear flow channel, and the boss is provided between two symmetrical flow channel ridges.

[0012] Preferably, the dual-chamber electrolysis unit includes a left end plate, a left insulating sealing gasket, a cathode monopolar plate, a first chamber cathode insulating sealing frame, a first chamber membrane electrode, a first chamber anode insulating sealing frame, a bipolar plate, a second chamber cathode insulating sealing frame, a second chamber membrane electrode, a second chamber anode insulating sealing frame, an anode monopolar plate, a right insulating sealing gasket and a right end plate, which are arranged in sequence, wherein the cathode monopolar plate has a cathode flow field, the anode monopolar plate has an anode flow field, and the bipolar plate has a cathode flow field and an anode flow field.

[0013] Preferably, the left end plate and the right end plate are made of stainless steel, titanium or nickel.

[0014] Preferably, the diffusion layer of the membrane electrode is made of a conductive porous material.

[0015] Preferably, the left insulating sealing gasket, the first chamber cathode insulating sealing frame, the first chamber anode insulating sealing frame, the second chamber cathode insulating sealing frame, the second chamber anode insulating sealing frame and the right insulating sealing gasket are all made of insulating corrosion-resistant materials, and the insulating corrosion-resistant materials include at least PTFE, PP, PPS, silicone or fluororubber.

[0016] The beneficial effects of the present invention are: 1. This structure ensures uniform distribution of electrolyte in the flow channel. Through innovative flow channel design and flow field distribution structure, the efficiency and stability of the electrolysis unit are improved. The bipolar plate structure has efficient gas separation capability, good conductivity and excellent corrosion resistance, which effectively improves the energy utilization rate in the process of electrolytic hydrogen production.

[0017] 2. Compared with other plates with variable diameter flow channels, the present invention optimizes the layout of the flow channel area and adds the design of anode curved flow channels and anode flow channel truncation on the basis of the variable diameter flow channels to ensure the stability of the electrolysis unit. The maximum fluctuation before optimization is 6.6mV. After optimization, the maximum fluctuation of the electrolysis unit test voltage is reduced to about 3.6mV. At the same time, the performance of the electrolysis unit is also improved. Under the same working conditions (1MKOH, 1A / cm²@60℃), the average cell voltage is reduced by about 100mV after optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a dual-chamber electrolysis unit using high-performance plates.

[0019] Figure 2 This is a schematic diagram of the structure of a cathode flow field.

[0020] Figure 3 for Figure 2 A partial enlarged view of area A.

[0021] Figure 4This is a schematic diagram of the structure of an anode flow field.

[0022] Figure 5 for Figure 4 A partial enlarged view of area B in the middle.

[0023] Figure 6 The figure is a performance test comparison chart of an electrolytic unit optimized by the present invention and a conventional electrolytic unit.

[0024] Description of the reference numerals: left end plate 1, left insulating sealing gasket 2, cathode monopolar plate 3, first chamber cathode insulating sealing frame 4, first chamber membrane electrode 5, first chamber anode insulating sealing frame 6, bipolar plate 7, second chamber cathode insulating sealing frame 8, second chamber membrane electrode 9, second chamber anode insulating sealing frame 10, anode monopolar plate 11, right insulating sealing gasket 12 and right end plate 13, cathode flow field 100, anode flow field 200, first electrolyte inlet 110, first inlet distribution area 120, first electrolyte inlet 130, first electrolyte inlet distribution area 131, first electrolyte inlet 132, first electrolyte inlet distribution area 133, first electrolyte inlet distribution area 134, first electrolyte inlet distribution area 135, first electrolyte inlet distribution area 136, first electrolyte inlet distribution area 137, first electrolyte inlet distribution area 138, first electrolyte inlet distribution area 139, first electrolyte inlet distribution area 140, first electrolyte inlet distribution area 141, first electrolyte inlet distribution area 142, first electrolyte inlet distribution area 143, first electrolyte inlet distribution area 144, first electrolyte inlet distribution area 145, first electrolyte inlet distribution area 146, first electrolyte inlet distribution area 147, first electrolyte inlet distribution area 148, first electrolyte inlet distribution area 149, first electrolyte inlet distribution area 150, first electrolyte inlet distribution area 151, first electrolyte inlet distribution area 152, first electrolyte inlet distribution area 153, first electrolyte inlet distribution area 154, first electrolyte inlet distribution area 155, first electrolyte inlet distribution area 156, first electrolyte inlet distribution area 157, first electrolyte inlet distribution area 158, first electrolyte inlet distribution area 159, first electrolyte inlet distribution area 159, first electrolyte inlet distribution area 15 A flow channel area 130, a first outlet distribution area 140, a first electrolyte outlet 150, a cathode linear flow channel area 160, a curved flow channel area 170, a bent flow channel 171, a second electrolyte inlet 210, a second inlet distribution area 220, a second flow channel area 230, a second outlet distribution area 240, a second electrolyte outlet 250, an anode linear flow channel area 260, a truncated distributed flow channel area 270, a multi-segment linear flow channel 271, a flow channel ridge 280, a breakpoint 281, and a boss 290. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0026] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0027] like Figure 1 As shown, a dual-chamber electrolysis unit using high-performance plates includes a left end plate 1, a left insulating sealing gasket 2, a cathode monopolar plate 3, a first chamber cathode insulating sealing frame 4, a first chamber membrane electrode 5, a first chamber anode insulating sealing frame 6, a bipolar plate 7, a second chamber cathode insulating sealing frame 8, a second chamber membrane electrode 9, a second chamber anode insulating sealing frame 10, an anode monopolar plate 11, a right insulating sealing gasket 12 and a right end plate 13, wherein the dual-chamber electrolysis unit includes at least a cathode plate having a cathode flow field 100 and an anode plate having an anode flow field 200, wherein the cathode monopolar plate has a cathode flow field 100, the anode monopolar plate has an anode flow field 200, and the bipolar plate has a cathode flow field 100 and an anode flow field 200. Figure 2-3As shown, the cathode flow field 100 includes a first electrolyte inlet 110, a first inlet distribution area 120, a first flow channel area 130, a first outlet distribution area 140 and a first electrolyte outlet 150 arranged in sequence along the flow direction of the electrolyte. The flow channel area of ​​the cathode flow field 100 includes a plurality of flow channels for the electrolyte to pass through. The flow channel area of ​​the cathode flow field 100 includes at least a cathode straight flow channel area 160 having a plurality of straight flow channels and a curved flow channel area 170 having a plurality of bent flow channels 171. The extremely straight flow channel area 160 is evenly arranged on both sides of the curved flow channel area 170; the length of the curved flow channel 171 is 1.1-1.3 times the length of the direct flow channel of the cathode; by extending the path length of the electrolyte passing through the curved flow channel 171, the pressure drop of the electrolyte flowing through the curved flow channel area 170 is 1-2 times the pressure drop of the cathode straight flow channel area 160, and the overall pressure drop of the cathode flow field 100 is also increased, so that the flow rate of hydrogen can be reduced, and the hydrogen in the cathode flow channel is prevented from flowing out too quickly; like Figure 4-5 As shown, the anode flow field 200 includes a second electrolyte inlet 210, a second inlet distribution area 220, a second flow channel area 230, a second outlet distribution area 240 and a second electrolyte outlet 250 arranged in sequence along the electrolyte flow direction. The second flow channel area includes a plurality of flow channels for electrolyte to pass through. The second flow channel area at least includes an anode linear flow channel area 260 with a plurality of direct flow channels and a truncated distribution flow channel area 270 with a plurality of multi-segment linear flow channels 271. The anode linear flow channel area is evenly arranged on both sides of the truncated distribution flow channel area; each of the multi-segment linear flow channels is composed of two flow channel ridges 280 with a plurality of breakpoints 281 evenly and symmetrically distributed; the electrolyte flow directions of the anode linear flow channel area and the cathode linear flow channel area 160 are perpendicular. The bent flow channel 171 is a wavy flow channel; the length of each breakpoint on the flow channel ridges on both sides of the multi-segment linear flow channel is not greater than the width of the multi-segment linear flow channel.

[0028] The area of ​​the curved flow channel area 170 accounts for 40%-60% of the area of ​​the first flow channel area. The larger the area of ​​the curved flow channel area 170 accounts for the area of ​​the first flow channel area, the greater the overall pressure drop of the cathode flow field 100. In this embodiment, the first flow channel area adopts a combination of straight flow channels on both sides and a curved or variable diameter flow channel in the middle. One reason for using this combined flow channel is that the pressure at the inlet end of the flow channel is higher than the pressure at its outlet end. When the electrolyte flows in the flow field, the electrolyte produces friction with the flow channel during the flow process due to its viscosity, which causes the pressure at the outlet end to be lower than the inlet end. In actual situations, the pressure loss of the flow channel in the middle part of the flow channel area is small, and the pressure loss of the flow channels on both sides is large. Therefore, the middle part adopts a curved or variable diameter flow channel to increase the pressure loss. In addition, since the amount of hydrogen generated by the cathode is twice that of the anode oxygen, appropriately increasing the pressure drop of the cathode helps to control the flow rate of hydrogen and prevent it from flowing out too quickly in the flow channel.

[0029] In this embodiment, the curved flow channel 171 is composed of a plurality of relatively gentle S-shaped channels forming a wave-shaped flow channel. The flow channel width of the wave-shaped flow channel decreases at its crest and / or trough (in this embodiment, it decreases only at the crest). Figure 3 , 5 As shown in the figure, the eddy current and flow velocity changes generated by the bends, caliber changes and truncation of the wavy flow channel in the multi-segment linear flow channel will enhance the fluid disturbance in the electrolyte. The eddy current and flow velocity gradient will accelerate the diffusion process of the reactants in the electrolyte, reduce the concentration polarization phenomenon near the electrode surface, and enable the reactants in the electrolyte to reach the electrode surface faster, thereby increasing the reaction rate and quickly taking the products away from the electrode surface to avoid the inhibitory effect on the reaction. In the electrolytic cell, fluid disturbance can cause the fluid to contact the electrode surface more evenly, reduce the existence of flow dead zones, and thus increase the effective utilization area of ​​the electrode. At the same time, since bubbles will be generated on the electrode surface during the electrolysis process, eddy currents and flow velocity changes can effectively reduce the time for bubbles to adhere to the electrode surface, avoid bubbles from hindering the electrolyte from contacting the electrode surface, and thus maintain the electrolysis efficiency. It can also increase the cleaning effect of the fluid, take the deposited or suspended particulate impurities away from the electrode surface, and reduce pollution and blockage problems.

[0030] In this embodiment, the width of the wavy flow channel at its crest and / or trough is 70% of the width of the remaining flow channel positions. The ratio of the length of a single wavy flow channel to the length of a single straight flow channel is 1.2:1. The pressure drop is proportional to the length of the flow channel. If the length of the wavy flow channel is 20% longer than that of the straight flow channel, its pressure drop will increase by about 20%. The diameter of the wavy flow channel is reduced by 30% at the bend. The reduction in diameter will significantly increase the local pressure loss. According to the Bernoulli principle and the Darcy-Weisbach formula When the diameter is reduced by 30% (i.e. from d0 to 0.7d0), the local pressure drop will increase significantly, about The bends in the wave-line flow channel will introduce eddies and secondary flows, which will increase the pressure loss. The additional pressure loss coefficient is usually calculated according to the empirical formula. Taking all the above factors into consideration, the pressure drop of the wave-shaped flow channel compared to the straight-line flow channel can be expressed as the following ratio: , where Δp is the pressure drop change rate, L is the length, "S-type" refers to the wavy flow channel, and "straight line" refers to the straight flow channel. Because the amount of hydrogen produced during electrolysis is much greater than that of oxygen, in order to avoid excessive or controllable outflow of hydrogen, it is considered to appropriately increase the overall pressure drop of the cathode flow field to make it greater than the overall pressure drop of the anode flow field. Specifically, the pressure drop of the curved flow channel area of ​​the cathode flow field can be significantly increased to increase the overall pressure drop of the cathode flow field. For example, when designing the pressure drop of the wavy flow channel, a pressure drop that is twice that of the straight flow channel is used as the goal. According to the above formula, the length, diameter reduction ratio, and curvature of the wavy flow channel are optimized and matched, so that the total pressure drop of the wavy flow channel caused by the increase in length, diameter reduction, and additional curvature is about twice that of the straight flow channel.

[0031] The multi-segment linear flow channel is also provided with a boss 290 whose height is not more than 1 / 3 of the flow channel ridge height. In this embodiment, the height design value of the boss 290 is 30% of the flow channel ridge height. The boss 290 plays the role of reducing the local flow channel caliber. The boss 290 is arranged between two symmetrical flow channel ridges (preferably arranged in the middle between two symmetrical flow channel ridges. If the boss is arranged near the breakpoint, local flow turbulence will occur, and a certain distance from the breakpoint should be maintained). Setting a truncation or boss 290 on the flow channel ridge will cause the velocity distribution of the local fluid to change, enhancing turbulence or disturbance. This effect can increase the material exchange rate between the fluid and the electrode surface, which helps to improve the reaction efficiency. And it can avoid the concentration gradient of the reaction material being too high and improve the uniformity of the electrolysis process. The truncation and boss 290 will change the flow path in the flow channel and suppress the deviation phenomenon. Providing a boss 290 and a truncation in the direct flow channel can guide the fluid to produce secondary flow, which is conducive to the separation of bubbles or particulate impurities from the flow channel surface and reduces the risk of blockage or local stagnation. The height of the boss 290 does not exceed the height of the flow channel ridge to avoid completely blocking the flow of the main flow channel.

[0032] The left end plate and the right end plate are made of stainless steel, titanium or nickel.

[0033] The diffusion layer of the membrane electrode is made of conductive porous material.

[0034] The left insulating sealing gasket 2, the first chamber cathode insulating sealing frame 4, the first chamber anode insulating sealing frame 6, the second chamber cathode insulating sealing frame 8, the second chamber anode insulating sealing frame 10, and the right insulating sealing gasket 12 are all made of insulating and corrosion-resistant materials, and the insulating and corrosion-resistant materials at least include PTFE, PP, PPS, silicone or fluororubber.

[0035] Figure 6This is a performance test comparison chart (1M KOH, 1A / cm²@60℃) of an electrolysis unit optimized by the present invention and a conventional electrolysis unit (the flow field only uses an ordinary direct current channel). The maximum fluctuation of the conventional electrolysis unit is 6.6mV, and the maximum fluctuation of the test voltage of the electrolysis unit optimized by the present invention is reduced to about 3.6mV. It can be seen that the flow field structure layout of the present invention better ensures the working stability of the electrolysis unit.

[0036] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. A dual-chamber electrolysis unit using high-performance plates, characterized in that: The dual-chamber electrolysis unit at least comprises a cathode plate having a cathode flow field and an anode plate having an anode flow field, the cathode flow field comprising a first electrolyte inlet, a first inlet distribution area, a first flow channel area, a first outlet distribution area and a first electrolyte outlet arranged in sequence along the flow direction of the electrolyte, the flow channel area of ​​the cathode flow field comprises a plurality of flow channels for the electrolyte to pass through, the flow channel area of ​​the cathode flow field at least comprises a cathode linear flow channel area having a plurality of direct current channels and a curved flow channel area having a plurality of curved flow channels, the cathode linear flow channel area being evenly arranged on both sides of the curved flow channel area; the length of the curved flow channel is 1.1-1.3 times the length of the direct current channel; by extending the path length of the electrolyte passing through the curved flow channel, the pressure drop of the electrolyte flowing through the curved flow channel area is 1-2 times the pressure drop of the cathode linear flow channel area, and the overall pressure drop of the cathode flow field is also increased, so that the flow rate of hydrogen is reduced, and the hydrogen in the cathode flow channel is prevented from flowing out too quickly; The anode flow field includes a second electrolyte inlet, a second inlet distribution area, a second flow channel area, a second outlet distribution area and a second electrolyte outlet arranged in sequence along the electrolyte flow direction. The second flow channel area includes multiple flow channels for electrolyte to pass through. The second flow channel area at least includes an anode linear flow channel area with multiple direct current channels and a truncated distributed flow channel area with multiple multi-segment linear flow channels. The anode linear flow channel area is evenly arranged on both sides of the truncated distributed flow channel area; each of the multi-segment linear flow channels is composed of two flow channel ridges with multiple breakpoints evenly and symmetrically distributed; the electrolyte flow directions of the anode linear flow channel area and the cathode linear flow channel area are perpendicular to each other.

2. The double-chamber electrolysis unit using high-performance plates according to claim 1, characterized in that: The bent flow channel is a wavy line flow channel; the length of each breakpoint on the flow channel ridges on both sides of the multi-segment linear flow channel is not greater than the width of the multi-segment linear flow channel.

3. The dual-chamber electrolysis unit using high-performance plates according to claim 2, characterized in that: The area of ​​the curved flow channel region accounts for 40%-60% of the area of ​​the first flow channel region.

4. The double-chamber electrolysis unit using high-performance plates according to claim 2, characterized in that: The width of the wave-shaped flow channel decreases at the wave crests and / or wave troughs.

5. The double-chamber electrolysis unit using high-performance plates according to claim 4, characterized in that: The width of the wave-shaped flow channel at its wave crest and / or wave trough is not less than 70% of the width of the remaining flow channel positions.

6. The dual-chamber electrolysis unit using high-performance plates according to claim 2, characterized in that: A boss with a height no greater than 1 / 3 of the height of the flow channel ridge is also provided in the multi-segment linear flow channel, and the boss is provided between two symmetrical flow channel ridges.

7. The dual-chamber electrolysis unit using high-performance plates according to claim 1, characterized in that: The dual-chamber electrolysis unit includes a left end plate, a left insulating sealing gasket, a cathode monopolar plate, a first chamber cathode insulating sealing frame, a first chamber membrane electrode, a first chamber anode insulating sealing frame, a bipolar plate, a second chamber cathode insulating sealing frame, a second chamber membrane electrode, a second chamber anode insulating sealing frame, an anode monopolar plate, a right insulating sealing gasket and a right end plate, wherein the cathode monopolar plate has a cathode flow field, the anode monopolar plate has an anode flow field, and the bipolar plate has a cathode flow field and an anode flow field.

8. The dual-chamber electrolysis unit using high-performance plates according to claim 7, characterized in that: The left end plate and the right end plate are made of stainless steel, titanium or nickel.

9. The dual-chamber electrolysis unit using high-performance plates according to claim 7, characterized in that: The diffusion layer of the membrane electrode is made of conductive porous material.

10. The dual-chamber electrolysis unit using high-performance plates according to claim 7, characterized in that: The left insulating sealing gasket, the first chamber cathode insulating sealing frame, the first chamber anode insulating sealing frame, the second chamber cathode insulating sealing frame, the second chamber anode insulating sealing frame and the right insulating sealing gasket are all made of insulating corrosion-resistant materials, and the insulating corrosion-resistant materials include at least PTFE, PP, PPS, silicone or fluororubber.

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