Indirect protection device for electrolytic bath

Abstract

The invention discloses an electrolytic bath indirect grounding protection device, which relates to the technical field of electrolytic bath grounding, and comprises a grounding unit comprising a clamping assembly, an inner support rod, a rotating assembly, a wiring terminal and an ejector rod, the protection unit comprises an L-shaped rod, a buckle block and a water blocking wiper. According to the device, non-metal interference inner support anchoring is carried out through the clamping assembly, so that the phenomena of metal electrochemical corrosion and thread rust caused by electrolyte permeation are avoided, and the grounding loop is ensured to have a lasting and stable low-resistance characteristic and repeatable disassembly and maintenance capability. And secondly, the linear pull-down action of the wiring terminal is accurately converted into the rotary motion of the rotating assembly, the rotary motion synchronously drives the L-shaped rod and the protection unit which are fixedly connected with the rotary motion to cooperatively swing, finally, the water blocking wiper automatically and accurately presses the sealing face of the valve, and continuous and reliable annular dynamic sealing is formed. And the corrosion protection capability of the key grounding interface is obviously improved.

Description

Technical Field

[0001] This invention relates to indirect grounding technology for electrolytic cells, and more particularly to an indirect grounding protection device for electrolytic cells. Background Technology

[0002] In alkaline water electrolysis hydrogen production systems, the electrolyte circulation system of the electrolyzer serves as the core thermal management and mass transfer unit, playing a crucial role in maintaining stable reaction temperature and KOH solution concentration. This system delivers the electrolyte through bottom / side inlets to a distribution network at the electrode frame cutouts, where it is evenly distributed through multiple channels before entering each reaction chamber, and finally circulating back through the outlet to form a closed loop. During this process, the strong ionic conductivity of the electrolyte generates a significant electrostatic accumulation effect within the metal flow channels, necessitating a reliable grounding system to eliminate potential differences and ensure safe equipment operation.

[0003] However, the current mainstream threaded embedded grounding solution has fatal flaws: First, the electrolyte continuously penetrates to the threaded connection interface, triggering localized electrochemical corrosion under the combined action of chloride ions and oxygen, leading to the formation of "rust-locked" metal oxide deposits between the thread grooves. This corrosion process is irreversible, causing the grounding resistance to increase exponentially. Second, frequent pipeline switching operations exacerbate the electrolyte penetration effect, forming a micro-battery effect at the metal contact surface, accelerating the electrochemical degradation of the interface layer. Under the combined effect of these two factors, the conductivity of the grounding system exhibits a non-linear decay characteristic with the operating cycle. When the grounding resistance exceeds the safety threshold, it not only leads to a decrease in the operational stability of the electrolyzer and a reduction in hydrogen production efficiency, but may also cause spark discharge due to static electricity accumulation, resulting in irreversible damage to the equipment or even systemic safety risks. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is: the problem that existing electrolytic cells rust and become stuck after long-term use, resulting in a gradual increase in grounding resistance and the inability to ground.

[0005] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes an indirect protection device for an electrolytic cell, which includes a connecting valve, a grounding unit fixed at the bottom of the connecting valve, and a protection unit hinged to one side of the grounding unit; The grounding unit includes a snap-fit ​​assembly fixed in the bottom hole of the connecting valve, an inner support rod sleeved inside the snap-fit ​​assembly, a rotating assembly rotating inside the inner support rod, a terminal block snapped inside the rotating assembly, and a top rod disposed at the end of the rotating assembly. The protection unit includes an L-shaped rod fixed to one end of the rotating assembly, a latching block hinged to the other end of the L-shaped rod, and a water-blocking scraper latched to the inside of the latching block.

[0006] In a preferred embodiment of the electrolytic cell indirect protection device of the present invention: the pipeline unit includes a main pipe connected to one side of the connecting valve, multiple sets of inter-cell pipes linearly connected to one side of the main pipe, and a regulating valve connected to one side of the inter-cell pipes.

[0007] In a preferred embodiment of the electrolytic cell indirect protection device of the present invention: the snap-fit ​​assembly includes an inner support tube and a nut that is fixedly snapped onto the outside of the inner support tube; The inner side of the inner support tube has a tapered shape that is wider on the inside and narrower on the outside.

[0008] In a preferred embodiment of the electrolytic cell indirect protection device of the present invention: the inner support rod includes a threaded drive end disposed at one end thereon, a limiting end protruding at the other end of the threaded drive end thereon, and a clearance groove formed between the threaded drive end and the limiting end thereon.

[0009] In a preferred embodiment of the electrolytic cell indirect protection device of the present invention: the rotating assembly includes a rotating cylinder hinged to the inner side of the inner support rod, a connecting rod sleeved on one side of the inside of the rotating cylinder, and a limiting rod sleeved on the other side of the inside of the rotating cylinder.

[0010] In a preferred embodiment of the electrolytic cell indirect protection device of the present invention: the rotating drum includes a placement groove opened at one end thereof, a fixing seat protruding from the end of the placement groove, and a hanging column protruding from one side of the wall of the placement groove. The wiring terminal mates with the slot hole of the hanging post.

[0011] In a preferred embodiment of the electrolytic cell indirect protection device of the present invention: the fixing seat extends outside the clearance groove and is fixedly connected to the L-shaped rod.

[0012] In a preferred embodiment of the electrolytic cell indirect protection device of the present invention: the limiting rod includes a fixed end disposed at one end thereon, and a through hole opened inside the fixed end. The end of the limiting rod is provided with a fixing cap that is fixedly limited to the fixed end.

[0013] In a preferred embodiment of the electrolytic cell indirect protection device of the present invention: the push rod is threaded to the inside of the through hole; Furthermore, the push rod can abut against the side wall of the wiring terminal.

[0014] In a preferred embodiment of the electrolytic cell indirect protection device of the present invention: the L-shaped rod is threadedly connected to the snap-fit ​​block; Furthermore, the water-blocking scraper is semi-elliptical in shape.

[0015] The beneficial effects of this invention are as follows: By using a non-metallic interference fit anchor for the snap-fit ​​component, electrochemical corrosion of the metal and thread "rusting" caused by electrolyte seepage are eliminated, ensuring that the grounding circuit has durable and stable low resistance characteristics and the ability to be repeatedly disassembled and maintained. Secondly, by precisely converting the linear pull-down action of the terminal into the rotational motion of the rotating component, and by ensuring the coaxiality and smoothness of the transmission process through a clearance fit design, this rotational motion synchronously drives the L-shaped rod and the protection unit fixed thereto to swing in coordination, ultimately causing the water-blocking scraper to automatically and accurately press against the valve sealing surface, forming a continuous and reliable annular dynamic seal, which significantly improves the corrosion protection capability of critical grounding interfaces. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A schematic diagram of the structure of the indirect protection device for the electrolytic cell of the present invention is shown; Figure 2 The present invention is shown Figure 1 A schematic diagram of the grounding unit and protection unit at point A; Figure 3 A side view of the grounding unit and protection unit structure of the present invention is shown; Figure 4 An exploded cross-sectional view of the grounding unit structure of the present invention is shown; Figure 5 Another exploded cross-sectional view of the grounding unit structure of the present invention is shown; Figure 6 A schematic diagram of the application scenario of the electrolytic cell indirect protection device of the present invention is shown. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0019] Reference Figures 1-6This embodiment provides an indirect protection device for an electrolytic cell, including a connecting valve 1, a grounding unit 2 fixed to the bottom of the connecting valve 1, and a protection unit 3 hinged to one side of the grounding unit 2; The grounding unit 2 includes a snap-fit ​​assembly 21 fixed in the bottom hole of the connecting valve 1, an inner support rod 22 sleeved inside the snap-fit ​​assembly 21, a rotating assembly 23 rotating inside the inner support rod 22, a terminal block 24 snapped inside the rotating assembly 23, and a top rod 25 disposed at the end of the rotating assembly 23. The protection unit 3 includes an L-shaped rod 31 fixed to the end of the rotating assembly 23, a latching block 32 hinged to the other end of the L-shaped rod 31, and a water-blocking scraper 33 latched to the inside of the latching block 32.

[0020] Furthermore, the pipeline unit 4 includes a main pipe 41 connected to one side of the connecting valve 1, multiple sets of inter-channel pipes 42 linearly connected to one side of the main pipe 41, and a regulating valve 43 connected to one side of the inter-channel pipes 42.

[0021] In this embodiment, as Figure 1 As shown, the device mainly includes a connecting valve 1, a grounding unit 2 fixedly installed at the bottom of the connecting valve, and a protection unit 3 connected to one side of the grounding unit by a hinge. Figure 2 As shown, the grounding unit 2, as the core component for achieving reliable electrical connection, is composed of a snap-fit ​​assembly 21, an inner support rod 22, a rotating assembly 23, a wiring terminal 24, and a top rod 25.

[0022] The snap-fit ​​assembly 21 employs a hollow conical structure made of corrosion-resistant plastic. This assembly generates controllable elastic deformation by applying axial assembly pressure, forcing the outer wall of the cone to expand radially, thereby forming a precise interference fit with the pre-machined pre-drilled hole or standard flange hole at the bottom of the connecting valve 1. This design utilizes the elastic recovery properties of the material to generate uniform and continuous contact stress at the mating interface, achieving mechanical interlocking and a highly reliable seal. This connection mechanism ensures that the grounding unit 2 can be quickly and securely snap-fitted onto the valve 1, avoiding the problem of traditional threaded connections rusting and becoming impossible to disassemble. Furthermore, as... Figure 4 The hollow cone of the shown snap-fit ​​assembly 21 has an internal thread at its wide end. This internal thread is threaded to the inner support rod 22, which allows the inner support rod 22 to apply axial assembly pressure to the snap-fit ​​assembly 21, thereby enabling an interference fit between the snap-fit ​​assembly 21 and the bottom of the connecting valve 1.

[0023] The inner support rod 22 is made of high-strength, corrosion-resistant plastic material and has a hollow, stepped shaft structure. Its overall cylindrical cavity is divided into shaft segments of different diameters from top to bottom, forming a stepped transition, which facilitates the axial positioning of the rotating component 23. An external thread is provided on the outer side of the inner support rod 22 that mates with the snap-fit ​​component 21. This external thread precisely matches the internal thread on the wide end of the snap-fit ​​component 21. By rotating the inner support rod 22, it can be screwed into the snap-fit ​​component 21 along the threaded pair, thereby converting the rotational motion into axial linear feed. The inner cavity of the inner support rod 22 has a smooth and precisely sized cylindrical guide hole. This inner hole has a clearance fit with the corresponding shaft segment of the rotating component 23. This fit ensures that the rotating component 23 can rotate smoothly and with low resistance within the cavity of the inner support rod 22 under external force or drive, while also constraining its radial runout through a limited clearance, ensuring coaxiality and transmission accuracy, thus providing a stable and reliable motion transmission for the rotating component 23.

[0024] The rotating assembly 23 is a cylindrical cavity with a protruding post fixedly mounted on its inner side, which is connected to the terminal block 24. A slot is provided at the location of this protruding post to allow the terminal block 24 to extend into the rotating assembly 23 and attach to the protruding post inside the cavity. A radial connecting arm is located at the center of the outer side of the rotating assembly 23, and this arm is fixedly connected to the L-shaped rod 31 by a pin or welding. When the rotating assembly 23 rotates, it drives the L-shaped rod 31 to rotate synchronously.

[0025] When terminal 24 is vertically tightened downwards by an external force, the slot at the end of terminal 24 pulls the protrusion of rotating component 23 to move. During the downward pull, the interaction between the protrusion and the slot at the end of terminal 24 generates a tangential force, forcing rotating component 23 to rotate around its axis. The installation position and length of L-shaped rod 31 are precisely calculated to ensure that its rotation trajectory ultimately keeps the plane of water-blocking scraper 33 of protection unit 3 perpendicular to the axial extension line of terminal 24, and presses water-blocking scraper 33 against the sealing surface of valve 1, forming a ring-shaped contact, thereby achieving the functions of dynamic water blocking and scraping off electrolyte.

[0026] Terminal 24 is an existing device, made of a high-conductivity copper alloy, with a round slot at the top for connecting the terminal post.

[0027] The push rod 25 is located at the bottom of the rotating assembly 23. One end of it is connected to the rotating assembly 23 by a thread, and the other end is a hemispherical top surface, which is used to provide preload to the terminal 24 during installation.

[0028] Preferably, the protection unit 3 includes an L-shaped rod 31, a latching block 32, and a water-blocking scraper 33. The L-shaped rod 31 is welded together with a long side and a short side, and the end of the long side is hinged to the side wall of the rotating assembly 23 by a pin, allowing the entire protection unit to rotate around the axis. The latching block 32 is hinged to the end of the short side of the L-shaped rod 31, and has a T-shaped slot on its inner side. The water-blocking scraper 33 is made of fluororubber material, and its cross-section matches the slot. It can be embedded into the latching block 32 by compression to form an annular sealing structure, which is used to block the electrolyte and prevent its penetration on the wall of the valve 1 in the vertical direction of the grounding unit 1.

[0029] In addition, the system is equipped with a piping unit 4, including a main pipe 41 connected to one side of the connecting valve 1, multiple sets of inter-tank pipes 42 linearly connected to the main pipe 41 via flanges, and a regulating valve 43 installed at the outlet end of the inter-tank pipes 42. The main pipe 41 is made of seamless steel pipe with an inner anti-corrosion lining, while the inter-tank pipes 42 are made of 316 stainless steel rigid pipes, and a sealed connection is achieved through compression fittings. The regulating valve 43 is used to control the flow rate of electrolyte in each branch to maintain uniform concentration and temperature.

[0030] When installing the grounding device, the operator first accurately hooks the slot at the end of the terminal 24 onto the pre-set protrusion on the inner wall of the rotating assembly 23 through the side opening of the inner support rod 22. This design allows the terminal 24 to be completely contained inside the valve 1 during the initial installation stage, effectively preventing it from being exposed to the external corrosive environment and significantly reducing the risk of corrosion due to contact with electrolytes or corrosive media in the atmosphere.

[0031] Subsequently, by pulling the grounding lead connected to terminal 24 vertically, terminal 24 is moved downwards. Since its slot and the protrusion of the rotating assembly 23 form a sliding pair, the downward pull will force the rotating assembly 23 to rotate around its axis. This rotational motion further drives the L-shaped rod 31, which is fixedly installed on the outer end of the rotating assembly 23, to rotate synchronously, eventually making it stably rotate to a position directly above the axis of terminal 24.

[0032] At this point, the protection unit 3 at the end of the L-shaped rod 31 is in the working position. The operator can further rotate the adjustment mechanism to change the spatial posture of the water-blocking scraper 33, so that its elastic sealing surface is evenly pressed against the outer wall of the pipe or the sealing flange of the valve 1 with appropriate pressure, thereby achieving a reliable dynamic seal, effectively preventing electrolyte from seeping in along the valve interface gap, and protecting the internal grounding unit 2 from corrosion.

[0033] Finally, by screwing on the push rod 25, it is moved upward and the terminal 24 is firmly pressed against the limiting groove or contact surface inside the rotating assembly 23. This crimping process provides mechanical fixation while ensuring a large-area, low-resistance electrical contact between the terminal 24 and the grounding path, thereby establishing a stable and reliable grounding connection.

[0034] In summary, this device, through the non-metallic interference fit anchor of the snap-fit ​​component 21, eliminates the electrochemical corrosion of metals and the "rusting" of threads caused by electrolyte seepage, ensuring that the grounding circuit has durable and stable low resistance characteristics and the ability to be repeatedly disassembled and maintained. Secondly, by precisely converting the linear pull-down motion of the terminal 24 into the rotational motion of the rotating component 23, and through a clearance fit design, the coaxiality and smoothness of the transmission process are ensured. This rotational motion synchronously drives the L-shaped rod 31 and the protection unit 3 fixed thereto to swing in tandem, ultimately causing the water-blocking scraper 33 to automatically and precisely press against the valve sealing surface, forming a continuous and reliable annular dynamic seal, significantly improving the corrosion protection capability of the critical grounding interface.

[0035] Reference Figures 1-5 As an optional embodiment, in one embodiment provided in this application, the snap-fit ​​assembly 21 includes an inner support tube 211 and a nut 212 that is snap-fitted onto the outside of the inner support tube 211; The inner side of the inner support tube 211 has a tapered shape that is wider on the inside and narrower on the outside.

[0036] Furthermore, the inner support rod 22 includes a threaded drive end 221 disposed at one end, a limiting end 222 protruding from the other end of the threaded drive end 221, and a relief groove 223 formed between the threaded drive end 221 and the limiting end 222.

[0037] Furthermore, the rotating assembly 23 includes a rotating cylinder 231 hinged to the inner side of the inner support rod 22, a connecting rod 232 sleeved inside one side of the rotating cylinder 231, and a limiting rod 233 sleeved inside the other side of the rotating cylinder 231.

[0038] Furthermore, the rotating drum 231 includes a mounting groove 2311 opened at one end thereof, a fixing seat 2312 protruding from the end of the mounting groove 2311, and a hanging post 2313 protruding from one side of the wall of the mounting groove 2311. Terminal 24 mates with the slot hole of post 2313.

[0039] Furthermore, the fixing seat 2312 extends outside the clearance groove 223 and is fixedly connected to the L-shaped rod 31.

[0040] Furthermore, the limiting rod 233 includes a fixed end 2331 disposed at one end thereon, and a through hole 2332 opened inside the fixed end 2331. The end of the limiting rod 233 is provided with a fixing cap 234 that is fixedly limited to the fixed end 2331.

[0041] Furthermore, the push rod 25 is threaded into the inside of the through hole 2332; Furthermore, the push rod 25 can abut against the side wall of the terminal block 24.

[0042] In this embodiment, the snap-fit ​​assembly 21 adopts a split structure design, mainly composed of an inner support tube 211 and a nut 212. The inner support tube 211 is injection molded from high-strength nylon composite material, and its tube body has a hollow structure with the inner side precisely machined into a converging conical hole that is wider on the inside and narrower on the outside. This conical cavity matches the contour of the inner support rod 22, enabling it to generate uniform radial elastic deformation under pressure, achieving sealing and clamping. The nut 212 is a ring nut structure, made of the same corrosion-resistant material, and its inner side has a snap-fit ​​protrusion that matches the annular groove on the outer side of the inner support tube 211. Irreversible fixed snap-fit ​​is achieved through axial pressing, together forming a complete interference fit anchoring mechanism.

[0043] Furthermore, the inner support rod 22 adopts a three-section functional structure design. The threaded drive end 221 has a standard triangular external thread machined on its surface for meshing with the internal thread of the nut 212. The limiting end 222 is divided into shaft segments of different diameters from top to bottom, forming a stepped transition. Its end face can serve as the force application surface when rotating the inner support rod 22, and at the same time, it axially limits the connecting rod 232 and the limiting rod 233. The clearance groove 223 is an annular groove with a rectangular cross section, which provides circumferential rotational freedom for the fixed seat 2312 of the rotating component 23 to avoid motion interference.

[0044] Furthermore, the rotating assembly 23 adopts a multi-layered sleeve structure, including a rotating cylinder 231 hinged to the inner side of the inner support rod 22, a connecting rod 232 press-fitted to one side of the inside of the rotating cylinder 231, and a limiting rod 233 fixed to the other side of the inside of the rotating cylinder 231. The rotating cylinder 231, as the core transmission component, includes a circular mounting groove 2311 at one end, a rectangular fixing seat 2312 protruding from the end of the mounting groove 2311, and a cylindrical hanging post 2313 protruding from one side of the wall of the mounting groove 2311. The mounting groove 2311 is used to accommodate the head of the connecting terminal 24; the fixing seat 2312 extends outward through the clearance groove 223 of the inner support rod 22, and its outer end is rigidly connected to the L-shaped rod 31 via a pin, transmitting the rotational motion outward; the hanging post 2313 is used to form a connecting pair with the elongated groove at the top of the connecting terminal 24.

[0045] The connecting rod 232 and the limiting rod 233 are inserted into the inner hole of the rotating drum 231 from both ends. The connecting rod 232 has an internal threaded hole on its eccentric side for embedding the connecting wire, so that one side of it passes through the inner support tube 211 and connects to the wire of the valve 1.

[0046] One end of the limiting rod 233 is a threaded fixed end 2331 with a through hole 2332 in the center and an internal thread machined inside the through hole. The fixed end 2331 is pressed and fixed to the inner stepped surface of the rotating drum 231 by the fixing cap 234, forming an axial constraint, which axially limits the connecting rod 232 and the limiting rod 233 within the rotating drum 231 and the limiting end 222.

[0047] The terminal 24 engages with the hanging post 2313 via an elongated groove on its top. The groove width is slightly larger than the diameter of the hanging post, forming a connection pair. When the grounding wire is subjected to a vertically downward pulling force, the terminal 24 moves downward and, through the contact between the groove wall and the hanging post 2313, converts the linear pulling force into a torque that causes the rotating drum 231 to rotate.

[0048] The push rod 25 is a short shaft with external threads, which is screwed into the through hole 2332 of the limiting rod 233. Rotating the push rod 25 can push it upward along the thread, and finally its top spherical surface will press against the side wall recess of the terminal 24, realizing the simultaneous completion of mechanical locking and electrical connection.

[0049] The working principle of the grounding protection device described in this embodiment is based on its ingenious mechanical structure and linkage, which enables the rapid establishment of grounding connection and the simultaneous completion of corrosion protection. Its working process can be divided into the following stages: First, in the initial installation state, the operator aligns the inner support tube 211 with the pre-drilled hole at the bottom of valve 1 and manually presses the nut 212 to initially align the tapered outer wall of the inner support tube 211 under the guidance of the hole. Then, the threaded drive end 221 of the inner support rod 22 is screwed on. Because its threaded drive end 221 engages with the internal thread of the nut 212, the rotational motion is converted into axial feed, driving the inner support rod 22 downwards. The tapered head of the inner support rod 22 then squeezes into the tapered hole of the inner support tube 211, forcing the inner support tube 211 to elastically expand until its outer wall forms an interference fit with the valve mounting hole, achieving mechanical anchoring and initial sealing.

[0050] Next, the grounding wire is connected to terminal 24. After the operator connects the external grounding lead to terminal 24, the lead is pulled vertically downwards. Terminal 24 is pulled down, and because its top elongated groove cooperates with the hanging post 2313 on the rotating drum 231, the downward linear motion is converted into a tangential force by the contact surface between the groove wall and the hanging post, forcing the rotating drum 231 to rotate around its axis. The rotation of the rotating drum 231 is transmitted to the rigidly connected L-shaped rod 31 through its fixed seat 2312, driving the L-shaped rod 31 to drive the water-blocking scraper 33 at its end to swing synchronously, ultimately causing the sealing surface of the water-blocking scraper 33 to adhere to the outer wall of the pipe of valve 1, forming a dynamic sealing ring around the circumference of the pipe, effectively preventing electrolyte leakage.

[0051] Finally, the electrical connection is tightened. The push rod 25 is rotated using a tool. Because it is threaded into the through hole 2332 of the limit rod 233, the rotation causes the push rod 25 to screw upwards. Its spherical tip then presses against the pre-reserved recess on the side wall of the terminal 24, generating significant contact pressure. This pressure, on the one hand, creates a large-area, low-resistance electrical contact between the terminal 24 and the internal connecting rod 232, ensuring reliable conduction of the grounding current; on the other hand, the mechanical locking completely eliminates any possibility of loosening of the terminal 24, ensuring long-term operational stability.

[0052] Reference Figures 2-3 As an optional embodiment, in one embodiment provided in this application, the L-shaped rod 31 is threadedly connected to the snap-fit ​​block 32; Furthermore, the water-blocking scraper 33 is semi-elliptical in shape.

[0053] In this embodiment, the short end of the L-shaped rod 31 is machined with external threads. This threaded segment has a specific pitch and thread angle to provide reliable connection strength and precise adjustment capability. The main body of the snap-fit ​​block 32 is a square block structure with a threaded blind hole at its center that matches the external thread of the short end of the L-shaped rod 31. By rotating the snap-fit ​​block 32, it can be moved axially along the threaded segment of the L-shaped rod 31, thereby achieving fine adjustment of the relative position between the snap-fit ​​block 32 and the L-shaped rod 31, and finally being fixed by the self-locking characteristic of the threaded pair.

[0054] The water-blocking scraper 33 is molded from alkali-resistant fluororubber material, and its overall shape is a semi-elliptical flexible scraper. This shape makes its long side a continuous smooth arc that matches the curvature of the pipe's outer wall, while its short side is a straight line. On one side of the semi-elliptical straight line, an inverted T-shaped wedge strip is molded to precisely fit into the T-shaped groove on the inner side of the locking block 32. By pressing the wedge strip axially into the groove, the water-blocking scraper 33 and the locking block 32 form a strong and sealed mechanical interlock.

[0055] When the rotating assembly 23 rotates and drives the L-shaped rod 31 to swing to the working position, the semi-elliptical water-blocking scraper 33 contacts the outer wall of the pipe of valve 1 with its long arc edge. Due to the adjustability of the threaded connection, the operator can precisely control the clamping force of the water-blocking scraper 33 on the pipe. The rotational adjustment of the semi-elliptical shape angle of the water-blocking scraper 33 ensures that the scraper blade forms a wide strip-shaped sealing contact area with the outer wall of the circular pipe, rather than a line contact, thereby greatly improving the reliability of scraping off electrolyte and preventing its leakage. The continuous elastic pressure allows the fluororubber scraper blade to adapt to the slight unevenness of the pipe surface and maintain stable sealing performance under system vibration conditions.

[0056] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. An indirect protection device for an electrolytic cell, characterized in that: include, A connecting valve (1), a grounding unit (2) fixed to the bottom of the connecting valve (1), and a protection unit (3) hinged to one side of the grounding unit (2). The grounding unit (2) includes a snap-fit ​​assembly (21) fixed in the bottom hole of the connecting valve (1), an inner support rod (22) sleeved inside the snap-fit ​​assembly (21), a rotating assembly (23) rotating inside the inner support rod (22), a terminal block (24) snapped inside the rotating assembly (23), and a top rod (25) disposed at the end of the rotating assembly (23). The protection unit (3) includes an L-shaped rod (31) fixed to the end of the rotating assembly (23), a latching block (32) hinged to the other end of the L-shaped rod (31), and a water-blocking scraper (33) latched to the inside of the latching block (32).

2. The indirect protection device for an electrolytic cell according to claim 1, characterized in that: It also includes, The pipeline unit (4) includes a main pipe (41) connected to one side of the connecting valve (1), multiple sets of inter-slot pipes (42) linearly connected to one side of the main pipe (41), and a regulating valve (43) connected to one side of the inter-slot pipes (42).

3. The indirect protection device for an electrolytic cell according to claim 2, characterized in that: The snap-fit ​​assembly (21) includes an inner support tube (211) and a nut (212) that is snapped onto the outside of the inner support tube (211). The inner support tube (211) has a tapered hole shape that is wider inside and narrower outside.

4. The indirect protection device for an electrolytic cell according to claim 3, characterized in that: The inner support rod (22) includes a threaded drive end (221) disposed at one end, a limiting end (222) protruding at the other end of the threaded drive end (221), and a clearance groove (223) formed between the threaded drive end (221) and the limiting end (222).

5. The indirect protection device for an electrolytic cell according to claim 4, characterized in that: The rotating assembly (23) includes a rotating cylinder (231) hinged to the inside of the inner support rod (22), a connecting rod (232) sleeved inside one side of the rotating cylinder (231), and a limiting rod (233) sleeved inside the other side of the rotating cylinder (231).

6. The indirect protection device for an electrolytic cell according to claim 5, characterized in that: The rotating drum (231) includes a mounting groove (2311) at one end, a fixing seat (2312) protruding from the end of the mounting groove (2311), and a hanging column (2313) protruding from one side of the wall of the mounting groove (2311). The wiring terminal (24) is fitted with the slot hole of the hanging post (2313).

7. The indirect protection device for an electrolytic cell according to claim 6, characterized in that: The fixing seat (2312) extends outside the clearance groove (223) and is fixedly connected to the L-shaped rod (31).

8. The indirect protection device for an electrolytic cell according to claim 7, characterized in that: The limiting rod (233) includes a fixed end (2331) disposed at one end thereon, and a through hole (2332) opened inside the fixed end (2331). The end of the limiting rod (233) is provided with a fixing cap (234) that is fixedly limited to the fixed end (2331).

9. The indirect protection device for an electrolytic cell according to claim 8, characterized in that: The push rod (25) is threaded to the inside of the through hole (2332); Furthermore, the top rod (25) can abut against the side wall of the terminal block (24).

10. The indirect protection device for an electrolytic cell according to claim 9, characterized in that: The L-shaped rod (31) is threadedly connected to the buckle block (32); Furthermore, the water-blocking scraper (33) is semi-elliptical in shape.

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