CN220034678U - Sodium hypochlorite preparation facilities - Google Patents

Abstract

The utility model provides a sodium hypochlorite preparation device, which comprises a shell and a pole core arranged in the shell, wherein the pole core comprises two end electrodes and at least one composite pole plate group; each end electrode comprises an electric connecting piece, a conductive fastening piece and a plurality of first polar plates which are stacked in sequence, and a gap is reserved between every two adjacent first polar plates; the electric connecting piece comprises a conducting rod and an electrode seat, one part of the electrode seat is inserted into a gap between two adjacent first polar plates and is contacted with the first polar plates, and the other part of the electrode seat extends out to one side of the first polar plates; the conductive fasteners penetrate through the plurality of first electrode plates and the electrode base at the same time along the stacking direction of the plurality of first electrode plates, so that the plurality of first electrode plates and the electrode base in the end electrode are fixed through the conductive fasteners. The sodium hypochlorite preparation device is convenient to install, disassemble, repair and replace, compact in structure, high in structural strength and high in chlorine yield.

Description

Sodium hypochlorite preparation facilities

Technical Field

The utility model relates to the technical field of electrolytic chlorine production equipment, in particular to a sodium hypochlorite preparation device.

Background

The sodium hypochlorite system prepared by the electrolysis of the seawater (salt water) is widely applied to circulating water treatment systems in the fields of power plants, petrochemical plants and the like, has wide application value in other sterilization and disinfection and biological propagation inhibition fields, and is uniformly accepted in all fields.

The tubular electrolytic cell is a commonly used electrolytic cell, as shown in fig. 1, most of the tubular electrolytic cells at present generally comprise a housing 81, and a pole core and an electrode base 82 which are arranged in the housing 81, wherein the pole core is composed of a plurality of electrode plates 83 which are arranged in a staggered manner; the electrode plates 83 at two ends are fixed on the electrode base 82, the electrode base 82 is connected with a conductive rod (not shown), so that the electrode of the electrolytic cell is led out of the housing 81 (one end of the conductive rod is connected with the electrode base 82, and the other end of the conductive rod extends out of the housing 81), and then the conductive rod is electrically connected with an external power source, so that the electrolytic chlorine making work can be performed (the structure of the tubular electrolytic cell can also refer to patent CN 217781292U).

However, in the above-mentioned electrolytic cell, since the electrode plate 83 and the electrode holder 82 are generally connected by welding, if the electrode plate 83 or the electrode holder 82 at the end is damaged, the electrode holder 82 and all the electrode plates 83 welded on the electrode holder 82 need to be replaced as a whole, and the cost of the electrode plate 83 and the electrode holder 82 is generally expensive, so that the cost is greatly increased due to the whole replacement. Moreover, since the electrode holders 82 serve as the bearing and connecting portions of the end electrode plates 83, the larger the number of the end electrode plates 83 is, the larger the size of the electrode holders 82 is correspondingly required to be designed, thereby increasing the volume of the electrolytic cell; meanwhile, the more the number of the end electrode plates 83 is, the greater the bearing stress intensity of the electrode seat 82 is, the lower the connection reliability between the end electrode plates 83 and the electrode seat 82 is (the electrode seat 82 is more easily damaged), and the number of the end electrode plates 83 is limited due to the connection mode of the electrode plates 83 and the electrode seat 82, so that the chlorine production efficiency is reduced. Meanwhile, the electrolytic tank is generally electrically connected with the electrode holder 82 through a single conductive rod, and the current during electrolysis is generally larger, and the phenomenon that the end part of the connecting structure of the single conductive rod heats due to the concentration of the current can occur, so that the use safety is reduced, and the service life of equipment is prolonged.

Disclosure of Invention

The utility model aims to provide a sodium hypochlorite preparation device which is convenient to mount, dismount, repair and replace, reduces repair and replacement cost, and is compact in structure, high in structural strength and high in chlorine yield.

The utility model provides a sodium hypochlorite preparation device, which comprises a shell and a pole core arranged in the shell, wherein the pole core comprises two end electrodes and at least one composite pole plate group, the two end electrodes are respectively arranged at the opposite ends in the shell, and the composite pole plate group is arranged between the two end electrodes;

each end electrode comprises an electric connecting piece, a conductive fastening piece and a plurality of first polar plates which are stacked in sequence, and a gap is reserved between every two adjacent first polar plates; the electric connector comprises a conductive rod and an electrode seat, one part of the electrode seat is inserted into a gap between two adjacent first polar plates and is contacted with the first polar plates, and the other part of the electrode seat extends out to one side of the first polar plates; the conductive fasteners penetrate through the plurality of first polar plates and the electrode base at the same time along the stacking direction of the plurality of first polar plates so that the plurality of first polar plates and the electrode base in the end electrode are fixed through the conductive fasteners; one end of the conducting rod is connected with the extending part of the electrode seat, and the other end of the conducting rod penetrates through the shell and then extends out of the shell.

Further, in each of the end electrodes, the electrical connectors include a first electrical connector and a second electrical connector; along being parallel to the plane that the first polar plate is located, and perpendicular to in the axial direction of shell, first electric connecting piece with the second electric connecting piece is located respectively the relative both sides of first polar plate, first electric connecting piece with the second electric connecting piece respectively with the relative both ends electricity of first polar plate is connected.

Further, in each end electrode, the number of the first electrical connectors and the second electrical connectors is two, the two first electrical connectors are arranged at intervals along the stacking direction of the plurality of first polar plates, and the two second electrical connectors are arranged at intervals along the stacking direction of the plurality of first polar plates.

Further, the electrode holder comprises an inserting part and an electric connecting part which are connected with each other, wherein the inserting part is inserted into a gap between two adjacent first polar plates and is contacted with the first polar plates, and the electric connecting part extends out to one side of the first polar plates; the conductive fasteners penetrate through the plugging parts of the plurality of first polar plates and the electrode base at the same time along the stacking direction of the plurality of first polar plates; the conductive rod is connected with the electric connection part.

Further, the electric connection part comprises a sleeve connected with the plug-in part, and the conductive rod is inserted and fixed in the sleeve.

Further, each of the end electrodes further includes a conductive block located in a gap between two adjacent first electrode plates and in contact with the first electrode plates; along the stacking direction of a plurality of first polar plates, the conductive fastener simultaneously penetrates through a plurality of first polar plates, the electrode base and the conductive block, so that the plurality of first polar plates, the electrode base and the conductive block in the end electrode are fixed through the conductive fastener.

Further, the sodium hypochlorite preparation device further comprises a support frame, wherein the support frame is arranged in the shell; the pole piece is arranged in the mounting groove and is fixed on the support frame through a fixing piece.

Further, each composite polar plate group comprises a plurality of second polar plates and a plurality of third polar plates, the second polar plates and the third polar plates are stacked alternately at intervals in sequence, and the adjacent second polar plates and third polar plates are arranged in a staggered manner along the axial direction of the shell; in the composite polar plate group close to the end electrode, one end of at least part of the second polar plate extends between two adjacent first polar plates in the end electrode and is not contacted with the first polar plate, and the other end of the second polar plate extends between two adjacent third polar plates and is not contacted with the third polar plate.

Further, the conductive fastener is a bolt-and-nut assembly.

Further, the shell comprises a cylinder body and two flanges, openings are formed in the two opposite ends of the cylinder body, the two flanges are respectively arranged at the openings in the two opposite ends of the cylinder body, and the flanges seal the openings of the cylinder body; the flange is provided with a water hole for electrolyte to enter and exit and a through hole for the conducting rod to pass through, and the conducting rod passes through the through hole and then extends out of the shell.

According to the sodium hypochlorite preparation device provided by the utility model, the end electrode adopts a laminated structure, namely a plurality of first polar plates in the end electrode are stacked, and meanwhile, the electrode holder adopts a plug-in structure, namely the electrode holder is inserted into a gap between two adjacent first polar plates and is contacted with the first polar plates, and the plurality of first polar plates and the electrode holder are penetrated by utilizing the conductive fastener at the same time, so that the plurality of first polar plates and the electrode holder in the end electrode are fixed by the conductive fastener, and the plurality of first polar plates and the electrode holder can be electrically connected by the conductive fastener.

The end electrode has compact structure, small volume and high structural strength, and the polar plate cannot be dislocated in the use and transportation processes; simultaneously, utilize conductive fastener to fix a plurality of first polar plates and electrode holder for first polar plate and electrode holder can dismantle, can conveniently install and dismantle maintenance change, and need not to wholly change, have reduced maintenance replacement cost. And the number of the first polar plates stacked in the end electrode is not limited by the electrode seat, so that the requirements of high chlorine yield and high concentration of available chlorine can be met.

Drawings

FIG. 1 is a schematic cross-sectional view of a prior art tubular cell.

Fig. 2 is a schematic structural diagram of a sodium hypochlorite production apparatus according to an embodiment of the present utility model.

Fig. 3 is a schematic cross-sectional view of fig. 2 with the housing removed.

Fig. 4 is a schematic diagram of an arrangement structure of a first electrode plate, a second electrode plate and a third electrode plate according to an embodiment of the present utility model.

Fig. 5 is a schematic structural diagram of an end electrode according to an embodiment of the present utility model.

Fig. 6 is a side view of fig. 5 (with the fasteners removed).

Fig. 7 is a schematic structural diagram of an electrical connector according to an embodiment of the utility model.

Fig. 8 is a schematic diagram of the explosive structure of fig. 7.

Fig. 9 is a schematic structural view of a support frame according to an embodiment of the utility model.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

As shown in fig. 2 to 6, the sodium hypochlorite preparation device provided by the embodiment of the utility model comprises a housing 1 and a pole core 200 arranged in the housing 1, wherein the pole core 200 comprises two end electrodes 2 and at least one composite pole plate group 3, the two end electrodes 2 are respectively arranged at opposite ends in the housing 1, the composite pole plate group 3 is arranged between the two end electrodes 2, and the two end electrodes 2 are respectively an end anode and an end cathode;

each end electrode 2 comprises an electric connector 21, a conductive fastener 22 and a plurality of first polar plates 23 which are stacked in sequence, wherein each first polar plate 23 is of a flat plate structure, and a gap is reserved between every two adjacent first polar plates 23. The electric connector 21 includes a conductive rod 211 and an electrode holder 212, a portion of the electrode holder 212 is inserted into a gap between two adjacent first electrode plates 23 and contacts the first electrode plates 23, and another portion of the electrode holder 212 protrudes to one side of the first electrode plates 23; along the stacking direction of the plurality of first electrode plates 23 (i.e. the direction indicated by arrow Y in fig. 5 and 6), the conductive fastener 22 penetrates through the plurality of first electrode plates 23 and the electrode holder 212 at the same time, so that the plurality of first electrode plates 23 and the electrode holder 212 in the end electrode 2 are fixed by the conductive fastener 22, and the plurality of first electrode plates 23 and the electrode holder 212 can be electrically connected by the conductive fastener 22. The conductive rod 211 extends along the axial direction of the housing 1, one end of the conductive rod 211 is connected to an extension portion of the electrode holder 212 (i.e., a portion of the electrode holder 212 extending to the side of the first electrode plate 23), and the other end of the conductive rod 211 extends out of the housing 1 after passing through the housing 1.

Specifically, in the sodium hypochlorite preparation device provided by the embodiment of the utility model, the end electrode 2 adopts a laminated structure, that is, a plurality of first polar plates 23 in the end electrode 2 are stacked, and the electrode base 212 adopts a plug-in structure, that is, the electrode base 212 is inserted into a gap between two adjacent first polar plates 23 and contacts with the first polar plates 23, and simultaneously penetrates through the plurality of first polar plates 23 and the electrode base 212 by using the conductive fastener 22, so that the plurality of first polar plates 23 and the electrode base 212 in the end electrode 2 are fixed by the conductive fastener 22, and the plurality of first polar plates 23 and the electrode base 212 can be electrically connected by the conductive fastener 22.

The end electrode 2 has compact structure, small volume and high structural strength, and the polar plates cannot be dislocated in the using and transporting processes; simultaneously, utilize conductive fastener 22 to fix a plurality of first polar plates 23 and electrode holder 212 for first polar plate 23 can be dismantled with electrode holder 212, can conveniently install and dismantle the maintenance change, and need not to wholly change, has reduced maintenance change cost. The number of the stacked first electrode plates 23 in the end electrode 2 is not limited by the electrode base 212 (the electrode base 212 adopts a plug-in structure, and the electrode base 212 is not used as a bearing component of the first electrode plates 23, so that the stacking number of the first electrode plates 23 basically does not influence the structural strength of the electrode base 212), and the stacking number of the first electrode plates 23 can be increased or decreased according to requirements, thereby being capable of meeting the requirements of high chlorine yield and high concentration of available chlorine.

As shown in fig. 5 and 6, in each of the end electrodes 2, the electrical connection member 21 includes a first electrical connection member 21A and a second electrical connection member 21B as one embodiment; along a plane parallel to the first polar plate 23 and perpendicular to the axial direction of the housing 1 (i.e. the direction indicated by arrow X in fig. 5 and 6), the first electrical connector 21A and the second electrical connector 21B are respectively located on opposite sides of the first polar plate 23, and the first electrical connector 21A and the second electrical connector 21B are respectively electrically connected to opposite ends of the first polar plate 23.

Specifically, through setting up first electric connector 21A and second electric connector 21B respectively with the relative both ends electricity of first polar plate 23 be connected, not only can make the electric current distribution on the first polar plate 23 more even to improve electrolysis chlorine production efficiency, can avoid the phenomenon that the tip generates heat to appear because of electric current concentrates in the local position of single electric connector 21 and first polar plate 23 moreover, thereby improve the life of equipment.

As shown in fig. 5 and 6, in each of the end electrodes 2, the number of the first electrical connectors 21A and the second electrical connectors 21B is 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. Namely, in the embodiment, four electric connectors 21 are respectively and electrically connected with four vertex angle positions of the lamination stack of the first polar plate 23, so that the current distribution is further more uniform, and the phenomenon of end heating is further avoided. Of course, in other embodiments, the number of electrical connectors 21 may be greater.

As shown in fig. 5 and 6, in each end electrode 2, a plurality of first electrode plates 23 and electrode holders 212 are fixed by a plurality of conductive fasteners 22, and the plurality of conductive fasteners 22 are arranged at intervals along the length direction of the first electrode plates 23 (i.e., the axial direction of the casing 1), so that the connection between the plurality of first electrode plates 23 and the electrode holders 212 in the end electrode 2 is more stable, and the structural strength of the end electrode 2 is further improved.

As shown in fig. 5 to 8, as an embodiment, the electrode holder 212 includes a socket 2121 and an electrical connection 2122 connected to each other, the socket 2121 being inserted into a gap between two adjacent first electrode plates 23 and contacting the first electrode plates 23, the electrical connection 2122 protruding to one side of the first electrode plates 23; the plugging portion 2121 extends along the length direction of the first polar plate 23 (i.e. the axial direction of the housing 1), and the length of the plugging portion 2121 is the same as or similar to the length of the first polar plate 23, so that the contact area between the plugging portion 2121 and the first polar plate 23 is larger. Along the stacking direction of the plurality of first electrode plates 23, the conductive fastener 22 simultaneously penetrates through the plurality of first electrode plates 23 and the plug-in portion 2121 of the electrode holder 212; the conductive rod 211 is connected to the electrical connection 2122.

As shown in fig. 5 to 8, as an embodiment, the electrical connection portion 2122 includes a sleeve 2122a connected to the socket 2121, and the conductive rod 211 is inserted and fixed into the sleeve 2122a, thereby facilitating electrical connection between the conductive rod 211 and the electrode holder 212.

As shown in fig. 5 and 6, as an embodiment, each end electrode 2 further includes a conductive block 24, and 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; the conductive fastener 22 penetrates the plurality of first electrode plates 23, the electrode holder 212 and the conductive bump 24 at the same time along the stacking direction of the plurality of first electrode plates 23, so that the plurality of first electrode plates 23, the electrode holder 212 and the conductive bump 24 in the end electrode 2 are fixed by the conductive fastener 22. The conductive blocks 24 are disposed corresponding to the ends of the first electrode plate 23, and the conductive blocks 24 are disposed at two ends of the first electrode plate 23 (the conductive blocks 24 at the two ends are disposed corresponding to the first electrical connector 21A and the second electrical connector 21B, respectively). It should be noted that, the conductive block 24 is not required to be disposed between the adjacent two first electrode plates 23 inserted with the electrode base 212.

Specifically, the conductive block 24 not only can electrically connect two adjacent first electrode plates 23, but also can play a role in spacing the two adjacent first electrode plates 23 (i.e., the size of the space between the two adjacent first electrode plates 23 can be adjusted by the thickness of the conductive block 24).

As shown in fig. 3, 5 and 9, as an embodiment, the sodium hypochlorite preparation device further includes a support frame 5, where the support frame 5 is disposed in the casing 1; the support frame 5 is provided with a mounting groove 50, the pole core 200 is arranged in the mounting groove 50, and the pole core 200 is fixed on the support frame 5 through the fixing piece 4. Meanwhile, the fixing piece 4 is made of insulating materials.

Specifically, through setting up support frame 5 in shell 1, support frame 5 is used for the support and the fixed of utmost point core 200, and not only the equipment of sodium hypochlorite preparation facilities is convenient for, can play sodium hypochlorite preparation facilities's structural strength moreover, prevents that the polar plate in the utmost point core 200 from appearing misplacing and influencing its electrolysis chlorine making performance in use and transportation.

As shown in fig. 9, as an embodiment, the support 5 includes a plurality of flat plates 51, and the plurality of flat plates 51 are spliced (or fixedly connected by fasteners) to form a main body structure of the support 5, and rib plates 52 and annular fixing plates 53 are arranged on the flat plates 51 to perform reinforcement, so that the support 5 has good structural strength.

As shown in fig. 3 to 6, as an embodiment, each composite electrode plate group 3 includes a plurality of second electrode plates 31 and a plurality of third electrode plates 32, where the second electrode plates 31 and the third electrode plates 32 are also in a flat plate structure, the plurality of second electrode plates 31 and the plurality of third electrode plates 32 are stacked alternately in turn (i.e. the order of the second electrode plates 31-third electrode plates 32-second electrode plates 31-third electrode plates 32 … is repeated, and the vertically adjacent second electrode plates 31 and third electrode plates 32 are spaced apart), and the adjacent second electrode plates 31 and third electrode plates 32 are arranged in a staggered manner along the axial direction of the casing 1 (i.e. in fig. 4, the adjacent second electrode plates 31 and third electrode plates 32 are arranged in a left-right staggered manner).

In the composite electrode plate group 3 close to the end electrode 2 (i.e., the leftmost or rightmost composite electrode plate group 3 in fig. 4), at least a portion of the second electrode plate 31 has one end extending between two adjacent first electrode plates 23 in the end electrode 2 and not in contact with the first electrode plates 23 (i.e., the second electrode plate 31 is spaced apart from the first electrode plates 23 up and down), and the other end extending between two adjacent third electrode plates 32 and not in contact with the third electrode plates 32. The specific structure of the composite electrode plate group 3 can refer to the structure of a bipolar electrolytic cell in the prior art, and is not described herein.

As shown in fig. 3 and 4, as an embodiment, the number of composite electrode groups 3 is plural, and the plural composite electrode groups 3 are arranged in order along the axial direction of the casing 1.

As shown in fig. 5 and 6, 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 shown), the bolt penetrates through the plurality of first electrode plates 23, the electrode holders 212 and the conductive blocks 24 at the same time, and both ends of the bolt are fastened by nuts (one end of the bolt may be fastened by a nut, and the other end of the bolt is provided with a head). Of course, in other embodiments, the conductive fastener 22 may be other fastening elements.

As shown in fig. 2 and 3, as an embodiment, the housing 1 includes a hollow cylinder 11 and two flanges 12, openings (not shown) are provided at opposite ends of the cylinder 11, the two flanges 12 are respectively provided 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 provided near the flanges 12. By providing the housing 1 such that the flange 12 is connected to the cylinder 11, the mounting and dismounting of the inner pole core 200 can be facilitated.

The middle part position of flange 12 is equipped with the apopore 121 that supplies electrolyte to go into, and the apopore 121 on one of them flange 12 is the apopore, and the apopore 121 on another one flange 12 is the apopore. The flange 12 is further provided with a through hole 122 for the conductive rod 211 to pass through, and the conductive rod 211 extends out of the shell 1 after passing through the through hole 122.

As shown in fig. 2, as an embodiment, a flange 111 is provided at an end of the cylinder 11, and the flange 12 is fixedly connected to the flange 111 by a fastener (not shown). Meanwhile, the flange 12 and the flange 111 are sealed by a gasket or a sealing ring (not shown), and the inner space of the cylinder 11 serves as an electrolysis chamber for electrolysis.

According to the sodium hypochlorite preparation device provided by the embodiment of the utility model, the end electrode 2 adopts a laminated structure, namely a plurality of first polar plates 23 in the end electrode 2 are stacked, and the electrode base 212 adopts a plug-in structure, namely the electrode base 212 is inserted into a gap between two adjacent first polar plates 23 and is contacted with the first polar plates 23, and the plurality of first polar plates 23 and the electrode base 212 are penetrated by the conductive fastener 22 at the same time, so that the plurality of first polar plates 23 and the electrode base 212 in the end electrode 2 are fixed by the conductive fastener 22, and the plurality of first polar plates 23 and the electrode base 212 can be electrically connected by the conductive fastener 22.

The end electrode 2 has compact structure, small volume and high structural strength, and the polar plates cannot be dislocated in the using and transporting processes; simultaneously, utilize conductive fastener 22 to fix a plurality of first polar plates 23 and electrode holder 212 for first polar plate 23 can be dismantled with electrode holder 212, can conveniently install and dismantle the maintenance change, and need not to wholly change, has reduced maintenance change cost. The number of the stacked first electrode plates 23 in the end electrode 2 is not limited by the electrode base 212 (the electrode base 212 adopts a plug-in structure, and the electrode base 212 is not used as a bearing component of the first electrode plates 23, so that the stacking number of the first electrode plates 23 basically does not influence the structural strength of the electrode base 212), and the stacking number of the first electrode plates 23 can be increased or decreased according to requirements, thereby being capable of meeting the requirements of high chlorine yield and high concentration of available chlorine.

Meanwhile, by arranging the first electric connecting piece 21A and the second electric connecting piece 21B to be respectively and electrically connected with the two opposite ends of the first polar plate 23, the current distribution on the first polar plate 23 can be more uniform, so that the electrolysis chlorine production efficiency is improved, the phenomenon that the end part heats due to the fact that the current is concentrated at the local positions of the single electric connecting piece 21 and the first polar plate 23 can be avoided, and the service life of equipment is prolonged.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (10)

1. The sodium hypochlorite preparation device is characterized by comprising a shell (1) and a pole core (200) arranged in the shell (1), wherein the pole core (200) comprises two end electrodes (2) and at least one composite pole plate group (3), the two end electrodes (2) are respectively arranged at two opposite ends in the shell (1), and the composite pole plate group (3) is arranged between the two end electrodes (2);

each end electrode (2) comprises an electric connecting piece (21), a conductive fastening piece (22) and a plurality of first polar plates (23) which are stacked in sequence, and a gap is reserved between every two adjacent first polar plates (23); the electric connector (21) comprises a conductive rod (211) and an electrode base (212), wherein one part of the electrode base (212) is inserted into a gap between two adjacent first polar plates (23) and is contacted with the first polar plates (23), and the other part of the electrode base (212) extends to one side of the first polar plates (23); the conductive fastener (22) penetrates through the plurality of first polar plates (23) and the electrode base (212) at the same time along the stacking direction of the plurality of first polar plates (23) so that the plurality of first polar plates (23) and the electrode base (212) in the end electrode (2) are fixed through the conductive fastener (22); one end of the conductive rod (211) is connected with the extending part of the electrode base (212), and the other end of the conductive rod (211) extends out of the shell (1) after penetrating through the shell (1).

2. Sodium hypochlorite production device according to claim 1, characterized in that in each of said end electrodes (2), said electrical connection (21) comprises a first electrical connection (21A) and a second electrical connection (21B); along the plane parallel to the first polar plate (23) and perpendicular to the axial direction of the shell (1), the first electric connecting piece (21A) and the second electric connecting piece (21B) are respectively positioned on two opposite sides of the first polar plate (23), and the first electric connecting piece (21A) and the second electric connecting piece (21B) are respectively electrically connected with two opposite ends of the first polar plate (23).

3. Sodium hypochlorite production device according to claim 2, 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 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).

4. The sodium hypochlorite production device as claimed in claim 1, wherein the electrode holder (212) comprises a plug portion (2121) and an electrical connection portion (2122) connected to each other, the plug portion (2121) being inserted in a gap between two adjacent first electrode plates (23) and being in contact with the first electrode plates (23), the electrical connection portion (2122) protruding to one side of the first electrode plates (23); the conductive fastener (22) penetrates through the plugging parts (2121) of the plurality of first polar plates (23) and the electrode base (212) simultaneously along the stacking direction of the plurality of first polar plates (23); the conductive rod (211) is connected to the electrical connection (2122).

5. The sodium hypochlorite production device as claimed in claim 4, wherein the electrical connection portion (2122) comprises a sleeve (2122 a) connected to the insertion portion (2121), and the conductive rod (211) is inserted and fixed in the sleeve (2122 a).

6. Sodium hypochlorite production device according to claim 1, characterized in that each of said end electrodes (2) further comprises a conductive block (24), said conductive block (24) being located in the gap between two adjacent first plates (23) and in contact with said first plates (23); along the stacking direction of a plurality of first polar plates (23), the conductive fastener (22) simultaneously penetrates a plurality of first polar plates (23), the electrode base (212) and the conductive block (24), so that the plurality of first polar plates (23), the electrode base (212) and the conductive block (24) in the end electrode (2) are fixed through the conductive fastener (22).

7. Sodium hypochlorite preparation device according to claim 1, characterized in that it further comprises a support (5), said support (5) being arranged inside said casing (1); the pole piece is characterized in that a mounting groove (50) is formed in the support frame (5), and the pole piece (200) is arranged in the mounting groove (50) and is fixed on the support frame (5) through a fixing piece (4).

8. The sodium hypochlorite production device as claimed in claim 1, wherein each of the composite electrode plate groups (3) comprises a plurality of second electrode plates (31) and a plurality of third electrode plates (32), the plurality of second electrode plates (31) and the plurality of third electrode plates (32) are stacked alternately in sequence, and adjacent second electrode plates (31) and third electrode plates (32) are arranged in a staggered manner along the axial direction of the casing (1); in the composite electrode plate group (3) close to the end electrode (2), one end of at least part of the second electrode plate (31) extends between two adjacent first electrode plates (23) in the end electrode (2) and is not contacted with the first electrode plates (23), and the other end of the second electrode plate extends between two adjacent third electrode plates (32) and is not contacted with the third electrode plates (32).

9. The sodium hypochlorite production device as in claim 1, wherein the conductive fastener (22) is a bolt-and-nut assembly.

10. The sodium hypochlorite preparation device as claimed in claim 1, wherein the casing (1) comprises a cylinder (11) and two flanges (12), openings are formed at opposite ends of the cylinder (11), the two flanges (12) are respectively arranged at the openings at opposite ends of the cylinder (11), and the flanges (12) seal the openings of the cylinder (11); the flange (12) is 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, and the conductive rod (211) passes through the through hole (122) and then extends out of the shell (1).