Sodium hypochlorite preparation device

Abstract

The present invention provides a sodium hypochlorite production device, comprising a housing and a core disposed within the housing. The core comprises two end electrodes and at least one composite electrode plate group. Each end electrode comprises an electrical connector, a conductive fastener, and a plurality of first electrode plates stacked in sequence, with a gap between each pair of adjacent first electrode plates. The electrical connector comprises a conductive rod and an electrode holder, a portion of the electrode holder being inserted into the gap between the two adjacent first electrode plates and contacting the first electrode plates, while another portion of the electrode holder extends to one side of the first electrode plates. The conductive fastener simultaneously penetrates the plurality of first electrode plates and the electrode holder along the stacking direction of the plurality of first electrode plates, thereby securing the plurality of first electrode plates and the electrode holder within the end electrode via the conductive fastener. This sodium hypochlorite production device is not only easy to install, disassemble, repair, and replace, but also compact, strong, and capable of producing a large amount of chlorine.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic chlorine production equipment, in particular to a sodium hypochlorite preparation device. Background Art

[0002] The system for preparing sodium hypochlorite by electrolyzing seawater (brine) is widely used in circulating water treatment systems in power plants, petrochemical plants and other fields. It also has wide application value in other fields of sterilization, disinfection and inhibition of biological reproduction. The system for preparing sodium hypochlorite by electrolyzing seawater (brine) has also been unanimously recognized in various fields.

[0003] Tubular electrolyzer is a commonly used electrolyzer, such as Figure 1 As shown, most of the current tubular electrolyzers generally include a shell 81 and an electrode core and an electrode seat 82 arranged in the shell 81. The electrode core is composed of a plurality of electrode plates 83 arranged in a staggered manner; wherein, the electrode plates 83 located at both ends are fixed on the electrode seat 82, and the electrode seat 82 is connected to a conductive rod (not shown), thereby leading the electrodes of the electrolyzer to the outside of the shell 81 (one end of the conductive rod is connected to the electrode seat 82, and the other end extends to the outside of the shell 81), and then the conductive rod is electrically connected to an external power supply to carry out electrolytic chlorine production (the structure of the tubular electrolyzer can also refer to patent CN217781292U).

[0004] However, in the electrolytic cell, since the electrode plates 83 and the electrode holder 82 are generally connected by welding, if the end electrode plates 83 or the electrode holder 82 are damaged, the electrode holder 82 and all the electrode plates 83 welded to the electrode holder 82 need to be replaced as a whole. Since the electrode plates 83 and the electrode holder 82 are generally expensive, the replacement of the entire body significantly increases the cost. Moreover, since the electrode holder 82 serves as the support and connection part for the end electrode plates 83, the more end electrode plates 83 there are, the larger the size of the electrode holder 82 needs to be designed, thereby increasing the volume of the electrolytic cell. At the same time, the more end electrode plates 83 there are, the greater the load-bearing strength of the electrode holder 82, and the lower the reliability of the connection between the end electrode plates 83 and the electrode holder 82 (the electrode holder 82 is more easily damaged). Due to the connection method between the electrode plates 83 and the electrode holder 82, the number of end electrode plates 83 is also limited, thereby reducing the chlorine production efficiency. At the same time, the above-mentioned electrolytic cell is generally electrically connected to the electrode holder 82 through a single conductive rod, and the current during electrolysis is generally large. The connection structure of the single conductive rod will cause the end to heat up due to current concentration, thereby reducing the safety of use and the service life of the equipment. Summary of the Invention

[0005] The purpose of the present invention is to provide a sodium hypochlorite preparation device, which is not only easy to install and disassemble, repair and replace, thereby reducing the repair and replacement costs, but also has a compact structure, high structural strength and large chlorine production.

[0006] The present invention provides a sodium hypochlorite preparation device, comprising a housing and a pole core disposed in the housing, the pole core comprising two end electrodes and at least one composite pole plate group, the two end electrodes being disposed at opposite ends of the housing, and the composite pole plate group being disposed between the two end electrodes;

[0007] Each of the end electrodes includes an electrical connector, a conductive fastener and a plurality of first electrode plates stacked in sequence, with a gap between each two adjacent first electrode plates; the electrical connector includes a conductive rod and an electrode seat, a portion of the electrode seat is inserted into the gap between the two adjacent first electrode plates and contacts the first electrode plates, and the other portion of the electrode seat extends to one side of the first electrode plate; along the stacking direction of the plurality of first electrode plates, the conductive fastener simultaneously penetrates the plurality of first electrode plates and the electrode seat, so that the plurality of first electrode plates and the electrode seat in the end electrode are fixed to each other through the conductive fastener; one end of the conductive rod is connected to the protruding portion of the electrode seat, and the other end of the conductive rod passes through the outer shell and extends out of the outer shell.

[0008] Furthermore, in each of the end electrodes, the electrical connector includes a first electrical connector and a second electrical connector; along a plane parallel to the plane where the first electrode plate is located and perpendicular to the axial direction of the shell, the first electrical connector and the second electrical connector are respectively located on opposite sides of the first electrode plate, and the first electrical connector and the second electrical connector are respectively electrically connected to the opposite ends of the first electrode plate.

[0009] Furthermore, in each of the end electrodes, the number of the first electrical connectors and the number of the second electrical connectors are both two, the two first electrical connectors are arranged at intervals along the stacking direction of the multiple first electrode plates, and the two second electrical connectors are arranged at intervals along the stacking direction of the multiple first electrode plates.

[0010] Furthermore, the electrode seat includes an interconnected plug-in portion and an electrical connection portion, the plug-in portion is inserted into the gap between two adjacent first electrode plates and contacts the first electrode plates, and the electrical connection portion extends to one side of the first electrode plates; along the stacking direction of multiple first electrode plates, the conductive fastener simultaneously penetrates multiple first electrode plates and the plug-in portion of the electrode seat; the conductive rod is connected to the electrical connection portion.

[0011] Furthermore, the electrical connection portion includes a sleeve connected to the plug-in portion, and the conductive rod is inserted and fixed in the sleeve.

[0012] Furthermore, each of the end electrodes also includes a conductive block, which is located in the gap between two adjacent first electrode plates and in contact with the first electrode plates; along the stacking direction of the multiple first electrode plates, the conductive fastener simultaneously penetrates the multiple first electrode plates, the electrode seats and the conductive blocks, so that the multiple first electrode plates, the electrode seats and the conductive blocks in the end electrode are fixed by the conductive fastener.

[0013] Furthermore, the sodium hypochlorite preparation device also includes a support frame, which is arranged in the shell; the support frame is provided with a mounting groove, and the pole core is arranged in the mounting groove and fixed to the support frame by a fixing member.

[0014] Furthermore, each of the composite electrode plate groups includes a plurality of second electrode plates and a plurality of third electrode plates, and the plurality of second electrode plates and the plurality of third electrode plates are stacked alternately in sequence, and adjacent second electrode plates and the third electrode plates are staggered along the axial direction of the shell; in the composite electrode plate group close to the end electrode, at least part of the second electrode plates have one end extending between two adjacent first electrode plates in the end electrode and not in contact with the first electrode plate, and the other end thereof extends between two adjacent third electrode plates and not in contact with the third electrode plate.

[0015] Furthermore, the conductive fastener is a bolt and nut assembly.

[0016] Furthermore, the shell includes a cylinder and two flanges, and openings are provided at opposite ends of the cylinder. The two flanges are respectively arranged at the openings at opposite ends of the cylinder, and the flanges seal the openings of the cylinder; the flanges are provided with water holes for the electrolyte to enter and exit, and through holes for the conductive rod to pass through, and the conductive rod extends out of the shell after passing through the through holes.

[0017] The sodium hypochlorite preparation device provided by the present invention has an end electrode adopting a laminated structure, that is, multiple first electrode plates in the end electrode are stacked, and an electrode seat adopts a plug-in structure, that is, the electrode seat is inserted into the gap between two adjacent first electrode plates and contacts the first electrode plates, and a conductive fastener is used to simultaneously penetrate the multiple first electrode plates and the electrode seat, so that the multiple first electrode plates in the end electrode and the electrode seat are fixed to each other by the conductive fastener, and the multiple first electrode plates and the first electrode plates and the electrode seat can be electrically connected by the conductive fastener.

[0018] This end electrode features a compact structure, small size, and high structural strength, preventing the plates from misaligning during use and transportation. Furthermore, conductive fasteners secure the multiple first plates to the electrode holder, making them removable and enabling easy installation and removal for repair and replacement without requiring complete replacement, reducing repair and replacement costs. Furthermore, the number of stacked first plates in the end electrode is not limited by the electrode holder, meeting the requirements for high chlorine production and high concentrations of available chlorine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional schematic diagram of a tubular electrolyzer in the prior art.

[0020] Figure 2 Schematic diagram of the structure of the sodium hypochlorite preparation device in an embodiment of the present invention.

[0021] Figure 3 for Figure 2 Schematic diagram of the cross section after removing the outer shell.

[0022] Figure 4 Schematic diagram of the arrangement structure of the first electrode plate, the second electrode plate and the third electrode plate in an embodiment of the present invention.

[0023] Figure 5 Schematic diagram of the structure of the end electrode in an embodiment of the present invention.

[0024] Figure 6 for Figure 5 Side view of (without fixings).

[0025] Figure 7 Schematic diagram of the structure of the electrical connector in an embodiment of the present invention.

[0026] Figure 8 for Figure 7 Schematic diagram of the explosion structure.

[0027] Figure 9 Schematic diagram of the structure of the support frame in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0029] The terms "first," "second," "third," "fourth," and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a particular sequential or chronological order.

[0030] like Figures 2 to 6As shown, the sodium hypochlorite preparation device provided by the embodiment of the present invention includes a housing 1 and a pole core 200 disposed in the housing 1. The pole core 200 includes two end electrodes 2 and at least one composite plate group 3. The two end electrodes 2 are respectively disposed at opposite ends of the housing 1. The composite plate group 3 is disposed between the two end electrodes 2. The two end electrodes 2 are respectively an end anode and an end cathode.

[0031] Each end electrode 2 includes an electrical connector 21, a conductive fastener 22, and a plurality of first electrode plates 23 stacked in sequence. The first electrode plates 23 are flat-plate structures, and a gap is formed between each two adjacent first electrode plates 23. The electrical connector 21 includes a conductive rod 211 and an electrode holder 212. A portion of the electrode holder 212 is inserted into the gap between the two adjacent first electrode plates 23 and contacts the first electrode plates 23, and another portion of the electrode holder 212 extends to one side of the first electrode plate 23. Figure 5 and Figure 6 The conductive fastener 22 extends in the direction indicated by the arrow Y in the middle of the housing 1 ), and simultaneously penetrates the plurality of first electrode plates 23 and the electrode holder 212, so that the plurality of first electrode plates 23 and the electrode holder 212 in the end electrode 2 are fixed to each other via the conductive fastener 22, and the plurality of first electrode plates 23 and the first electrode plates 23 and the electrode holder 212 are electrically connected via the conductive fastener 22. The conductive rod 211 extends along the axial direction of the housing 1, with one end of the conductive rod 211 connected to the protruding portion of the electrode holder 212 (i.e., the portion of the electrode holder 212 extending to one side of the first electrode plate 23), and the other end of the conductive rod 211 extends outside the housing 1 after passing through the housing 1.

[0032] Specifically, an embodiment of the present invention provides a sodium hypochlorite preparation device, in which the end electrode 2 adopts a laminated structure, that is, the multiple first electrode plates 23 in the end electrode 2 are stacked, and the electrode holder 212 adopts a plug-in structure, that is, the electrode holder 212 is inserted into the gap between two adjacent first electrode plates 23 and contacts the first electrode plates 23, and a conductive fastener 22 is used to simultaneously penetrate the multiple first electrode plates 23 and the electrode holder 212, so that the multiple first electrode plates 23 in the end electrode 2 and the electrode holder 212 are fixed by the conductive fastener 22, and the multiple first electrode plates 23 and the first electrode plates 23 and the electrode holder 212 can be electrically connected by the conductive fastener 22.

[0033] The end electrode 2 has a compact structure, a small size, and a high structural strength. The electrode plates will not be misaligned during use and transportation. At the same time, a conductive fastener 22 is used to fix multiple first electrode plates 23 and the electrode holder 212, so that the first electrode plates 23 and the electrode holder 212 are detachable, and can be easily installed and disassembled for maintenance and replacement without having to replace the entire electrode, thereby reducing maintenance and replacement costs. Moreover, the number of stacked first electrode plates 23 in the end electrode 2 is not limited by the electrode holder 212 (the electrode holder 212 adopts a plug-in structure and does not serve as a bearing component for the first electrode plates 23. Therefore, the number of stacked first electrode plates 23 will basically not affect the structural strength of the electrode holder 212). The number of stacked first electrode plates 23 can be increased or decreased according to demand, thereby meeting the needs of high chlorine production and high concentration of effective chlorine.

[0034] like Figure 5 and Figure 6 As shown, as an embodiment, in each end electrode 2, the electrical connector 21 includes a first electrical connector 21A and a second electrical connector 21B; along the plane parallel to the first electrode plate 23 and perpendicular to the axial direction of the housing 1 (i.e. Figure 5 and Figure 6 The first electrical connector 21A and the second electrical connector 21B are respectively located on opposite sides of the first electrode plate 23, and the first electrical connector 21A and the second electrical connector 21B are respectively electrically connected to opposite ends of the first electrode plate 23.

[0035] Specifically, by providing the first electrical connector 21A and the second electrical connector 21B to be electrically connected to the opposite ends of the first electrode plate 23 respectively, not only can the current distribution on the first electrode plate 23 be made more uniform, thereby improving the efficiency of electrolytic chlorine production, but also the phenomenon of end heating caused by current concentration in a single electrical connector 21 and a local position of the first electrode plate 23 can be avoided, thereby improving the service life of the equipment.

[0036] like Figure 5 and Figure 6 As shown, as an embodiment, each end electrode 2 includes two first electrical connectors 21A and two second electrical connectors 21B. The two first electrical connectors 21A are spaced apart along the stacking direction of the plurality of first electrode plates 23, and the two second electrical connectors 21B are spaced apart along the stacking direction of the plurality of first electrode plates 23. In other words, in this embodiment, four electrical connectors 21 are provided, electrically connected to the four corners of the stack of first electrode plates 23, thereby further uniformizing current distribution and preventing end heating. Of course, in other embodiments, the number of electrical connectors 21 may be greater.

[0037] like Figure 5 and Figure 6As shown, as an embodiment, in each end electrode 2, multiple first pole plates 23 and electrode holders 212 are fixed to each other by multiple conductive fasteners 22, and multiple conductive fasteners 22 are arranged at intervals along the length direction of the first pole plates 23 (that is, the axial direction of the shell 1), so that the connection between the multiple first pole plates 23 and the electrode holder 212 in the end electrode 2 is more stable, further improving the structural strength of the end electrode 2.

[0038] like Figures 5 to 8 As shown, as an embodiment, the electrode holder 212 includes an interconnected plug portion 2121 and an electrical connection portion 2122. The plug portion 2121 is inserted into the gap between two adjacent first electrode plates 23 and contacts the first electrode plates 23, and the electrical connection portion 2122 extends to one side of the first electrode plates 23. The plug portion 2121 extends along the length direction of the first electrode plates 23 (i.e., the axial direction of the housing 1). The length of the plug portion 2121 is the same as or similar to the length of the first electrode plates 23, so that the contact area between the plug portion 2121 and the first electrode plates 23 is larger. Along the stacking direction of the multiple first electrode plates 23, the conductive fastener 22 simultaneously penetrates the plug portions 2121 of the multiple first electrode plates 23 and the electrode holder 212; the conductive rod 211 is connected to the electrical connection portion 2122.

[0039] like Figures 5 to 8 As shown, as an embodiment, the electrical connection portion 2122 includes a sleeve 2122 a connected to the plug portion 2121 , and the conductive rod 211 is inserted and fixed in the sleeve 2122 a , thereby facilitating electrical connection between the conductive rod 211 and the electrode holder 212 .

[0040] like Figure 5 and Figure 6 As shown, as an embodiment, each end electrode 2 further includes a conductive block 24, which is located in the gap between two adjacent first electrode plates 23 and in contact with the first electrode plates 23; along the stacking direction of the multiple first electrode plates 23, the conductive fastener 22 simultaneously penetrates the multiple first electrode plates 23, the electrode holder 212 and the conductive block 24, so that the multiple first electrode plates 23, the electrode holder 212 and the conductive block 24 in the end electrode 2 are fixed by the conductive fastener 22. The conductive block 24 is arranged corresponding to the end of the first electrode plate 23, and a conductive block 24 is provided at both ends of the first electrode plate 23 (the conductive blocks 24 at both ends are respectively arranged corresponding to the first electrical connector 21A and the second electrical connector 21B). It should be noted that a conductive block 24 does not need to be provided between two adjacent first electrode plates 23 with the electrode holder 212 inserted.

[0041] Specifically, the conductive block 24 can not only electrically connect the two adjacent first plates 23, but also space the two adjacent first plates 23 (ie, the distance between the two adjacent first plates 23 can be adjusted by the thickness of the conductive block 24).

[0042] like Figure 3 、 Figure 5 and Figure 9 As shown, as an embodiment, the sodium hypochlorite preparation device further includes a support frame 5, which is disposed in the housing 1; the support frame 5 is provided with a mounting groove 50, and the pole core 200 is disposed in the mounting groove 50, and the pole core 200 is fixed to the support frame 5 by a fixing member 4. At the same time, the fixing member 4 is made of an insulating material.

[0043] Specifically, by arranging a support frame 5 in the outer shell 1, the support frame 5 is used to support and fix the pole core 200, which not only facilitates the assembly of the sodium hypochlorite preparation device, but also can play a role in the structural strength of the sodium hypochlorite preparation device, and prevent the pole plates in the pole core 200 from being misplaced during use and transportation, thereby affecting its electrolytic chlorine production performance.

[0044] like Figure 9 As shown, as an embodiment, the support frame 5 includes a plurality of flat plates 51, which are spliced together (or fixedly connected by fasteners) to form the main structure of the support frame 5. The flat plates 51 are provided with ribs 52 and annular fixing plates 53 for reinforcement, so that the support frame 5 has good structural strength.

[0045] like Figures 3 to 6 As shown, as an embodiment, each composite plate group 3 includes a plurality of second plates 31 and a plurality of third plates 32, the second plates 31 and the third plates 32 are also flat-plate structures, and the plurality of second plates 31 and the plurality of third plates 32 are alternately stacked (i.e., they are repeated in the order of second plate 31-third plate 32-second plate 31-third plate 32 ..., and the upper and lower adjacent second plates 31 and third plates 32 are spaced apart), and the adjacent second plates 31 and third plates 32 are staggered along the axial direction of the housing 1 (i.e., Figure 4 In the embodiment, the adjacent second electrode plates 31 and third electrode plates 32 are arranged in a left-right staggered manner).

[0046] In the composite plate group 3 close to the end electrode 2 (i.e. Figure 4In the leftmost or rightmost composite plate group 3, at least one end of a portion of the second electrode plate 31 extends between two adjacent first electrode plates 23 in the end electrode 2 without contacting the first electrode plates 23 (i.e., the second electrode plate 31 is spaced apart from the first electrode plates 23), and the other end thereof extends between two adjacent third electrode plates 32 without contacting the third electrode plates 32. The specific structure of the composite plate group 3 can be referred to the structure of a bipolar electrolytic cell in the prior art and will not be described in detail here.

[0047] like Figure 3 and Figure 4 As shown, as an embodiment, there are multiple composite electrode plate groups 3 , and the multiple composite electrode plate groups 3 are arranged in sequence along the axial direction of the housing 1 .

[0048] like Figure 5 and Figure 6 As shown, as an embodiment, the conductive fastener 22 is a conductive bolt and nut assembly, that is, the conductive fastener 22 includes a bolt and a nut (not numbered in the figure), the bolt simultaneously passes through the multiple first electrode plates 23, the electrode holder 212 and the conductive block 24, and both ends of the bolt are fastened with nuts (or one end of the bolt is fastened with a nut, and the other end of the bolt is provided with a head). Of course, in other embodiments, the conductive fastener 22 can also be other fastening elements.

[0049] like Figure 2 and Figure 3 As shown, as an embodiment, the housing 1 includes a hollow cylinder 11 and two flanges 12. The cylinder 11 has openings at opposite ends (not shown). The two flanges 12 are respectively disposed at the openings at opposite ends of the cylinder 11. The flanges 12 seal the openings of the cylinder 11, and the end electrode 2 is disposed near the flanges 12. By configuring the housing 1 so that the flanges 12 are connected to the cylinder 11, installation, removal, and maintenance of the internal electrode core 200 can be facilitated.

[0050] A water hole 121 is provided in the middle of the flange 12 for the electrolyte to flow in and out. One of the water holes 121 on the flange 12 is a water inlet, and the other is a water outlet. The flange 12 also has a through hole 122 for the conductive rod 211 to pass through. The conductive rod 211 extends out of the housing 1 after passing through the through hole 122.

[0051] like Figure 2 As shown in FIG. 1 , as an embodiment, a flange 111 is provided at the end of the cylinder 11, and the flange 12 is fixedly connected to the flange 111 by fasteners (not shown). Furthermore, the flange 12 and the flange 111 are sealed by a gasket or sealing ring (not shown), and the interior space of the cylinder 11 serves as an electrolysis chamber for electrolysis.

[0052] In the sodium hypochlorite preparation device provided by an embodiment of the present invention, the end electrode 2 adopts a laminated structure, that is, the multiple first electrode plates 23 in the end electrode 2 are stacked, and the electrode holder 212 adopts a plug-in structure, that is, the electrode holder 212 is inserted into the gap between two adjacent first electrode plates 23 and contacts the first electrode plates 23, and a conductive fastener 22 is used to simultaneously penetrate the multiple first electrode plates 23 and the electrode holder 212, so that the multiple first electrode plates 23 in the end electrode 2 and the electrode holder 212 are fixed by the conductive fastener 22, and the multiple first electrode plates 23 and the electrode holder 212 can be electrically connected by the conductive fastener 22.

[0053] The end electrode 2 has a compact structure, a small size, and a high structural strength. The electrode plates will not be misaligned during use and transportation. At the same time, a conductive fastener 22 is used to fix multiple first electrode plates 23 and the electrode holder 212, so that the first electrode plates 23 and the electrode holder 212 are detachable, and can be easily installed and disassembled for maintenance and replacement without having to replace the entire electrode, thereby reducing maintenance and replacement costs. Moreover, the number of stacked first electrode plates 23 in the end electrode 2 is not limited by the electrode holder 212 (the electrode holder 212 adopts a plug-in structure and does not serve as a bearing component for the first electrode plates 23. Therefore, the number of stacked first electrode plates 23 will basically not affect the structural strength of the electrode holder 212). The number of stacked first electrode plates 23 can be increased or decreased according to demand, thereby meeting the needs of high chlorine production and high concentration of effective chlorine.

[0054] At the same time, by arranging the first electrical connector 21A and the second electrical connector 21B to be electrically connected to the opposite ends of the first electrode plate 23 respectively, not only can the current distribution on the first electrode plate 23 be made more uniform, thereby improving the efficiency of electrolytic chlorine production, but also the phenomenon of end heating caused by the current being concentrated in a single electrical connector 21 and a local position of the first electrode plate 23 can be avoided, thereby improving the service life of the equipment.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A sodium hypochlorite preparation device, characterized in that, The invention comprises a shell (1) and a pole core (200) arranged in the shell (1), the pole core (200) comprising two end electrodes (2) and at least one composite pole plate group (3), the two end electrodes (2) being respectively arranged at opposite ends in the shell (1), and the composite pole plate group (3) being arranged between the two end electrodes (2); Each end electrode (2) comprises an electrical connector (21), a conductive fastener (22) and a plurality of first electrode plates (23) stacked in sequence, with a gap between each two adjacent first electrode plates (23); the electrical connector (21) comprises a conductive rod (211) and an electrode holder (212), a portion of the electrode holder (212) is inserted into the gap between the two adjacent first electrode plates (23) and in contact with the first electrode plates (23), and another portion of the electrode holder (212) extends to the first electrode plates (23). ) on one side; along the stacking direction of the plurality of first electrode plates (23), the conductive fastener (22) simultaneously penetrates the plurality of first electrode plates (23) and the electrode seat (212), so that the plurality of first electrode plates (23) and the electrode seat (212) in the end electrode (2) are fixed to each other through the conductive fastener (22); one end of the conductive rod (211) is connected to the protruding portion of the electrode seat (212), and the other end of the conductive rod (211) passes through the shell (1) and protrudes outside the shell (1); In each of the end electrodes (2), the electrical connector (21) comprises a first electrical connector (21A) and a second electrical connector (21B); along a plane parallel to the first electrode plate (23) and perpendicular to the axial direction of the housing (1), the first electrical connector (21A) and the second electrical connector (21B) are respectively located on opposite sides of the first electrode plate (23), and the first electrical connector (21A) and the second electrical connector (21B) are respectively electrically connected to opposite ends of the first electrode plate (23); Each of the end electrodes (2) further comprises a conductive block (24), wherein the conductive block (24) is located in a gap between two adjacent first electrode plates (23) and is in contact with the first electrode plates (23); along the stacking direction of the plurality of first electrode plates (23), the conductive fastener (22) simultaneously penetrates the plurality of first electrode plates (23), the electrode seat (212) and the conductive block (24), so that the plurality of first electrode plates (23), the electrode seat (212) and the conductive block (24) in the end electrode (2) are fixed to each other via the conductive fastener (22).

2. The sodium hypochlorite preparation device according to claim 1, wherein In each of the end electrodes (2), the number of the first electrical connectors (21A) and the number of the second electrical connectors (21B) are both two, the two first electrical connectors (21A) are arranged at intervals along the stacking direction of the plurality of first electrode plates (23), and the two second electrical connectors (21B) are arranged at intervals along the stacking direction of the plurality of first electrode plates (23).

3. The sodium hypochlorite preparation device according to claim 1, wherein The electrode seat (212) comprises a plug-in portion (2121) and an electrical connection portion (2122) that are connected to each other, wherein the plug-in portion (2121) is inserted into the gap between two adjacent first electrode plates (23) and contacts the first electrode plates (23), and the electrical connection portion (2122) extends to one side of the first electrode plates (23); along the stacking direction of the plurality of first electrode plates (23), the conductive fastener (22) simultaneously penetrates the plug-in portion (2121) of the plurality of first electrode plates (23) and the electrode seat (212); and the conductive rod (211) is connected to the electrical connection portion (2122).

4. The sodium hypochlorite preparation device according to claim 3, wherein The electrical connection portion (2122) comprises a sleeve (2122a) connected to the plug-in portion (2121), and the conductive rod (211) is inserted and fixed in the sleeve (2122a).

5. The sodium hypochlorite preparation device according to claim 1, wherein The sodium hypochlorite preparation device further comprises a support frame (5), wherein the support frame (5) is arranged in the housing (1); a mounting groove (50) is provided on the support frame (5), and the pole core (200) is arranged in the mounting groove (50) and fixed to the support frame (5) via a fixing member (4).

6. The sodium hypochlorite preparation device according to claim 1, wherein Each composite electrode plate group (3) comprises a plurality of second electrode plates (31) and a plurality of third electrode plates (32), wherein the plurality of second electrode plates (31) and the plurality of third electrode plates (32) are alternately stacked and arranged in sequence, and adjacent second electrode plates (31) and adjacent third electrode plates (32) are arranged in a staggered manner along the axial direction of the housing (1); in the composite electrode plate group (3) close to the end electrode (2), at least one end of a portion of the second electrode plates (31) extends between two adjacent first electrode plates (23) in the end electrode (2) without contacting the first electrode plates (23), and the other end thereof extends between two adjacent third electrode plates (32) without contacting the third electrode plates (32).

7. The sodium hypochlorite preparation device according to claim 1, wherein The conductive fastener (22) is a bolt and nut assembly.

8. The sodium hypochlorite preparation device according to claim 1, wherein The shell (1) comprises a cylinder (11) and two flanges (12); openings are provided at opposite ends of the cylinder (11); the two flanges (12) are respectively arranged at the openings at opposite ends of the cylinder (11); the flanges (12) seal the openings of the cylinder (11); the flanges (12) are provided with a water hole (121) for electrolyte to enter and exit, and a through hole (122) for the conductive rod (211) to pass through; the conductive rod (211) passes through the through hole (122) and then extends out of the shell (1).

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