Automatic replacement device for magnesium rod of electric water heater

Abstract

The invention relates to the technical field of magnesium rod replacement devices, in particular to an electric water heater magnesium rod automatic replacement device which comprises a water heater body, an electric hydraulic cylinder, a sewage discharge structure, a mounting ring, a sewage discharge head, a butt joint structure, a mounting structure, a limiting structure and a magnesium rod. The pollution discharge structure is mounted at the pollution discharge port of the pollution discharge head, so that sewage can be conveniently discharged to a designated position from the pollution discharge structure in the magnesium rod dismounting process, and the cleanliness in the operation process is better; the butt joint structure is driven by the electric hydraulic cylinder to move up and down, the mounting structure is driven by the butt joint structure to move up and down, and therefore automatic mounting of the magnesium rod is achieved, mounting and dismounting of the magnesium rod are more convenient, other auxiliary tools are not needed, the operation efficiency is high, and meanwhile regular cleaning of the interior of the water heater body is facilitated; the use state of the magnesium rod is more convenient to check; the installation structure and the butt joint structure are limited through the limiting structure, so that the operation stability of the installation structure is better.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium rod replacement devices, in particular to an automatic magnesium rod replacement device for an electric water heater. Background Art

[0002] An electric water heater refers to a water heater that uses electricity as an energy source for heating. Electric water heaters can be divided into three types according to the heating power: storage type (also known as volumetric type or heat storage type), instant type, and rapid heating type (also known as semi-storage type). Storage type electric water heaters require regular replacement of the magnesium rod. There are two types of magnesium rod settings for storage type electric water heaters. One is set on the side and requires replacement by professionals, and the other is set on the bottom and can be replaced manually by users. Currently, the replacement of storage type electric water heaters with bottom-mounted magnesium rods is basically manual.

[0003] When disassembling and replacing the magnesium rod, a wrench is required to disassemble the magnesium rod. Since the magnesium rod connector and the water heater are threaded, a lot of force is required during the disassembly and installation process, and the installation tightness is different, the installation and disassembly efficiency is low. Although the structure is relatively simple, certain professional knowledge is still required during the replacement process; it is not convenient to check the condition of the magnesium rod inside the water heater in time. If the magnesium rod is not replaced in time, a large amount of dirt and impurities will be generated inside the water heater, corroding the inner tank of the water heater, affecting the thermal efficiency and heating effect, and even causing safety hazards such as leakage and water leakage; Although the water source inside the water heater is discharged in advance during the removal of the magnesium rod, a large amount of sewage will flow out from the drain outlet after the magnesium rod is removed. It is necessary to hold up a container at the bottom of the drain outlet to collect the sewage. The operation flexibility is poor and it is easy to cause a large amount of sewage to spray into the bathroom, which is not conducive to the cleanliness during the operation. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides an automatic replacement device for a magnesium rod of an electric water heater.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an automatic replacement device for magnesium rods of electric water heaters, comprising a water heater body, a mounting ring fixed to the bottom end of the water heater body and a sewage discharge head threadedly connected to the mounting ring; a sewage discharge structure is installed at the sewage discharge port of the side wall of the sewage discharge head, the sewage discharge head is a hollow cylindrical structure, and a mounting structure for installing the magnesium rod is slidably provided inside the sewage discharge head; The installation structure includes a piston slidably disposed inside the sewage discharge head and a rubber ring sleeved on the piston. The rubber ring is slidably connected to the inner wall of the sewage discharge head. A frustum-shaped sealing ring is installed at the top end of the piston, and the sealing ring abuts against the sewage discharge head. A magnesium rod is threadedly connected to the top end of the piston. A pull rod is fixed to the bottom end of the piston, and a docking structure is installed at the bottom end of the pull rod. The pull rod and the docking structure are limited by a limiting structure. An electric hydraulic cylinder is installed on the side wall of the sewage discharge head, and the electric hydraulic cylinder drives the docking structure to move up and down.

[0006] Specifically, a driving block is installed outside the sewage discharge head, and the driving block has a hexagonal prism structure.

[0007] Specifically, a second sealing ring is sleeved on the top end of the sewage discharge head, and the second sealing ring abuts against the installation ring.

[0008] Specifically, the piston and the pull rod are fixed by a second bolt. The second bolt is rotatably connected to the piston and threadedly connected to the pull rod. A first sealing ring abuts between the second bolt and the piston, and the magnesium rod is located at the top end of the second bolt.

[0009] Specifically, the docking structure includes a top ring, a rotating sleeve and a bottom ring. The bottom end of the electric hydraulic cylinder is fixed with a bottom ring and a top ring by a first bolt. The top ring abuts against the bottom end of the electric hydraulic cylinder. The rotating sleeve is located between the top ring and the bottom ring and is rotatably connected to the bottom ring. A docking rod with an arc-shaped end facing the pull rod is installed on the rotating sleeve, and the center of the arc of the docking rod coincides with the axis of the rotating sleeve. The docking rod is engaged with a limiting groove on the pull rod.

[0010] Specifically, the limiting structure includes a pushing block and a limiting block. A sliding groove is provided at the bottom end of the docking rod, and a pushing block is slidably disposed inside the sliding groove. The thickness of the vertical section of the pushing block is greater than the thickness of the arc section. A limiting block is installed at the bottom end of the pushing block, and the limiting block is engaged with a limiting hole at the bottom end of the pull rod.

[0011] Specifically, a spring abuts between the pushing block and the docking rod, and the spring is located inside the sliding groove.

[0012] Specifically, an anti-detachment rod is threadedly connected to the docking rod. The anti-detachment rod penetrates through the spring, and the pushing block is slidably connected to the anti-detachment rod.

[0013] Specifically, the sewage discharge structure includes a connecting head. A connecting head is installed at the sewage discharge port of the sewage discharge head. A fixing sleeve is threadedly connected to the connecting head. The fixing sleeve is rotatably connected to the sewage pipe. A washer abuts between the sewage pipe and the connecting head, and the washer is located inside the fixing sleeve.

[0014] Specifically, a fixing ring is fixed to one end of the sewage pipe away from the fixed sleeve. A hanging ring is installed on the fixing ring, and a hook is installed on the water heater body. The hanging ring is suspended on the hook.

[0015] The beneficial effects of the present invention are: For the automatic magnesium rod replacement device of an electric water heater described in the present invention, a sewage discharge structure is installed at the sewage discharge port of the sewage head, which is convenient for discharging sewage from the sewage discharge structure to a designated position during the process of removing the magnesium rod, making the operation process cleaner.

[0016] For the automatic magnesium rod replacement device of an electric water heater described in the present invention, the docking structure is driven to move up and down by an electric hydraulic cylinder, and the installation structure is driven to move up and down by the docking structure, so as to realize the automatic installation of the magnesium rod, making the installation and removal of the magnesium rod more convenient, without the need to use other auxiliary tools, with high operation efficiency. At the same time, it is convenient to regularly clean the inside of the water heater body, making it more convenient to check the usage status of the magnesium rod.

[0017] For the automatic magnesium rod replacement device of an electric water heater described in the present invention, the installation structure and the docking structure are limited by a limiting structure, making the operation stability of the installation structure better, and at the same time facilitating the disassembly of the installation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the automatic magnesium rod replacement device for an electric water heater provided by the present invention; Figure 2 For Figure 1 The enlarged schematic diagram of the structure of part A shown; Figure 3 It is a schematic diagram of the connection structure between the installation ring and the sewage head of the present invention; Figure 4 It is a partially enlarged schematic diagram of the cross-section of the present invention; Figure 5 For Figure 4 The enlarged schematic diagram of the structure of part B shown; Figure 6 For Figure 4 The enlarged schematic diagram of the structure of part C shown; Figure 7 For Figure 4 The enlarged schematic diagram of the structure of part D shown; Figure 8 It is a schematic diagram of the connection structure between the connection head and the fixed sleeve of the present invention; Figure 9 It is a schematic diagram of the disassembled structure of the present invention; Figure 10Schematic diagram of the connection structure between the installation structure and the limit structure of the present invention; Figure 11 Bottom view of the docking structure of the present invention.

[0020] In the figure: 1, water heater body; 2, electric hydraulic cylinder; 3, sewage discharge structure; 301, sewage discharge pipe; 302, fixing ring; 303, hanging ring; 304, hook; 305, connecting head; 306, fixing sleeve; 307, washer; 4, installation ring; 5, sewage discharge head; 6, docking structure; 601, top ring; 602, rotating sleeve; 603, bottom ring; 604, first bolt; 605, docking rod; 606, chute; 7, installation structure; 701, pull rod; 702, limit hole; 703, piston; 704, rubber ring; 705, sealing ring; 706, first sealing ring; 707, second bolt; 708, limit groove; 8, limit structure; 801, push block; 802, limit block; 803, spring; 804, anti - detachment rod; 9, second sealing ring; 10, driving block; 11, magnesium rod. Specific embodiments

[0021] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0022] As Figures 1-9 and Figure 11 shown, an automatic magnesium rod replacement device for an electric water heater according to the present invention includes a water heater body 1, an installation ring 4 fixed to the bottom end of the water heater body 1, and a sewage discharge head 5 threadedly connected to the installation ring 4; a sewage discharge structure 3 is installed at the sewage discharge port on the side wall of the sewage discharge head 5. The sewage discharge head 5 is a columnar structure with a hollow interior, and an installation structure 7 for installing a magnesium rod 11 is slidably provided inside the sewage discharge head 5; The installation structure 7 includes a piston 703 slidably disposed inside the sewage discharge head 5 and a rubber ring 704 sleeved on the piston 703. The rubber ring 704 is slidably connected to the inner wall of the sewage discharge head 5. A frustum-shaped sealing ring 705 is installed at the top end of the piston 703, and the sealing ring 705 abuts against the sewage discharge head 5. A magnesium rod 11 is threadedly connected to the top end of the piston 703; a pull rod 701 is fixed to the bottom end of the piston 703, and a docking structure 6 is installed at the bottom end of the pull rod 701. The pull rod 701 and the docking structure 6 are limited by a limiting structure 8. An electric hydraulic cylinder 2 is installed on the side wall of the sewage discharge head 5, and the electric hydraulic cylinder 2 drives the docking structure 6 to move up and down; by driving the docking structure 6 to move up and down through the electric hydraulic cylinder 2, and driving the installation structure 7 to move up and down through the docking structure 6, the automatic installation of the magnesium rod 11 is realized, making the installation and disassembly of the magnesium rod 11 more convenient, without the need to use other auxiliary tools, with high operation efficiency. At the same time, it is convenient to regularly clean the inside of the water heater body 1, and it is more convenient to check the use state of the magnesium rod 11.

[0023] Specifically, as Figures 4-9 and Figure 11 shown, a driving block 10 is installed outside the sewage discharge head 5. The driving block 10 has a hexagonal prism structure. A second sealing ring 9 is sleeved on the top end of the sewage discharge head 5, and the second sealing ring 9 abuts against the installation ring 4. Use a wrench to rotate the driving block 10 counterclockwise to drive the sewage discharge head 5 to rotate, so that the sewage discharge head 5 is separated from the installation ring 4, and the sewage discharge head 5 can be disassembled and the damaged sewage discharge head 5 can be replaced. The second sealing ring 9 makes the sealing between the sewage discharge head 5 and the installation ring 4 better.

[0024] Specifically, as Figures 4-7 and Figure 9 shown, the piston 703 and the pull rod 701 are fixed by a second bolt 707. The second bolt 707 is rotatably connected to the piston 703 and threadedly connected to the pull rod 701. A first sealing ring 706 abuts between the second bolt 707 and the piston 703. The first sealing ring 706 makes the overall sealing of the piston 703 better. The magnesium rod 11 is located at the top end of the second bolt 707. When it is necessary to disassemble the piston 703 and the pull rod 701, rotate the second bolt 707 counterclockwise.

[0025] Specifically, as Figures 1-7 、 Figure 9 、 Figure 10 and Figure 11As shown, the docking structure 6 includes a top ring 601, a rotating sleeve 602, and a bottom ring 603. The bottom end of the electric hydraulic cylinder 2 is fixed with the bottom ring 603 and the top ring 601 through a first bolt 604. The top ring 601 abuts against the bottom end of the electric hydraulic cylinder 2. The rotating sleeve 602 is located between the top ring 601 and the bottom ring 603. The rotating sleeve 602 is rotatably connected to the bottom ring 603. A docking rod 605 with an arc-shaped end facing the pull rod 701 is installed on the rotating sleeve 602. The center of the arc of the docking rod 605 coincides with the axis of the rotating sleeve 602. The docking rod 605 is engaged with the limiting groove 708 on the pull rod 701; The limiting structure 8 includes a push block 801 and a limiting block 802. A sliding groove 606 is provided at the bottom end of the docking rod 605. The push block 801 is slidably arranged inside the sliding groove 606. The thickness of the vertical section of the push block 801 is greater than the thickness of the arc section. A limiting block 802 is installed at the bottom end of the push block 801. The limiting block 802 is engaged with the limiting hole 702 at the bottom end of the pull rod 701. A spring 803 abuts between the push block 801 and the docking rod 605. The spring 803 is located inside the sliding groove 606. An anti-disengagement rod 804 is threadedly connected to the docking rod 605. The anti-disengagement rod 804 penetrates through the spring 803. The push block 801 is slidably connected to the anti-disengagement rod 804; When the electric hydraulic cylinder 2 extends, it drives the top ring 601 and the bottom ring 603 to move downward. The top ring 601 and the bottom ring 603 drive the rotating sleeve 602 to move downward. The rotating sleeve 602 drives the docking rod 605 to move downward. The docking rod 605 pulls the pull rod 701 to move downward, causing the pull rod 701 to pull the piston 703 to move downward. The piston 703 drives the rubber ring 704 and the sealing ring 705 to move downward. When the top surface of the piston 703 is at the bottom end of the sewage discharge port of the sewage discharge head 5, the electric hydraulic cylinder 2 stops extending. The sewage discharge port on the side wall of the sewage discharge head 5 is communicated with the inside of the water heater body 1. Sewage is discharged from the inside of the water heater body 1 through the connecting head 305. When the sewage discharge is completed, the electric hydraulic cylinder 2 continues to extend. The docking rod 605 drives the piston 703 to completely slide out of the sewage discharge head 5. At this time, the usage condition of the magnesium rod 11 can be visually observed; If the magnesium rod 11 needs to be replaced, hold the docking rod 605 and press the push block 801. The push block 801 slides into the slide groove 606. The push block 801 slides with the anti-drop rod 804. The push block 801 is compressed against the spring 803. The push block 801 drives the limit block 802 to separate from the limit hole 702. Then, pull the docking rod 605 upward along the axis of the rotating sleeve 602. The docking rod 605 and the limit groove 708 on the pull rod 701 are not engaged. The docking rod 605 no longer limits the vertical position of the pull rod 701. Then, hold the pull rod 701 to completely remove the magnesium rod 11 from the sewage head 5. Turn the unusable magnesium rod 11 counterclockwise, and then fix the new magnesium rod 11 on the top of the piston 703 clockwise. Slide the piston 703 and its magnesium rod 11 into the sewage head 5. The connecting rod 605 presses the push block 801, and the push block 801 slides into the slide groove 606. The push block 801 is compressed by the spring 803, and then the docking rod 605 is pushed upward along the axis of the rotating sleeve 602. The docking rod 605 is engaged with the limiting groove 708 on the pull rod 701. When the limiting block 802 corresponds to the limiting hole 702, the push block 801 is released, the spring 803 extends, and the spring 803 is against the push block 801. The push block 801 drives the limiting block 802 to engage with the limiting hole 702, so that the pull rod 701 and the docking rod 605 cannot move, thereby improving the stability. Then the electric hydraulic cylinder 2 contracts and automatically drives the piston 703 to move upward. The rubber ring 704 and the sealing ring 705 on the piston 703 seal the sewage head 5, making the installation of the magnesium rod 11 more convenient and quick.

[0026] Specifically, Figures 1-8 As shown, the sewage discharge structure 3 includes a connector 305, a connector 305 is installed at the sewage outlet of the sewage discharge head 5, a fixing sleeve 306 is threadedly connected to the connector 305, the fixing sleeve 306 is rotatably connected to the sewage discharge pipe 301, a gasket 307 is abutted between the sewage discharge pipe 301 and the connector 305, the gasket 307 is inside the fixing sleeve 306, a fixing ring 302 is fixed to the end of the sewage discharge pipe 301 away from the fixing sleeve 306, a hanging ring 303 is installed on the fixing ring 302, and a hook 303 is installed on the water heater body 1. 04, the hanging ring 303 is hung on the hook 304; when the magnesium rod 11 needs to be replaced, the hanging ring 303 is taken out from the hook 304, so that the end of the sewage pipe 301 is aligned with the toilet or sewer, so that the sewage is directly discharged to the designated location. The sewage pipe 301 can be selected as needed. When the sewage pipe 301 is not in use, the fixing sleeve 306 is rotated counterclockwise to separate the fixing sleeve 306 from the connecting head 305. There is a gasket 307 between the sewage pipe 301 and the connecting head 305 to make the sealing performance between the sewage pipe 301 and the connecting head 305 better.

[0027] When the present invention is in use, when it is necessary to replace the magnesium rod 11, the hanging ring 303 is taken out from the hook 304, and the end of the sewage discharge pipe 301 is aligned with the toilet or sewer, so as to facilitate the direct discharge of sewage to the designated position. The sewage discharge pipe 301 can be selected as needed. When the sewage discharge pipe 301 is not used, the fixing sleeve 306 is rotated counterclockwise to separate the fixing sleeve 306 from the connecting head 305. A washer 307 is abutted between the sewage discharge pipe 301 and the connecting head 305, so that the sealing performance between the sewage discharge pipe 301 and the connecting head 305 is better; The telescoping of the electric hydraulic cylinder 2 (the model of the electric hydraulic cylinder 2 is SXTL) is controlled through the control panel of the water heater body 1. The elongation of the electric hydraulic cylinder 2 drives the top ring 601 and the bottom ring 603 to move downward. The top ring 601 and the bottom ring 603 drive the rotating sleeve 602 to move downward. The rotating sleeve 602 drives the docking rod 605 to move downward. The docking rod 605 pulls the pull rod 701 to move downward, so that the pull rod 701 pulls the piston 703 to move downward. The piston 703 drives the rubber ring 704 and the sealing ring 705 to move downward. When the top surface of the piston 703 is at the bottom end of the sewage discharge port of the sewage discharge head 5, the electric hydraulic cylinder 2 stops elongating. The sewage discharge port on the side wall of the sewage discharge head 5 is communicated with the inside of the water heater body 1, and the sewage is discharged from the inside of the water heater body 1 through the connecting head 305. When the sewage discharge is completed, the electric hydraulic cylinder 2 continues to elongate, and the docking rod 605 drives the piston 703 to completely slide out of the sewage discharge head 5. At this time, the usage condition of the magnesium rod 11 can be visually observed; If the magnesium rod 11 needs to be replaced, hold the docking rod 605 and press the push block 801. The push block 801 slides into the slide groove 606. The push block 801 slides with the anti-drop rod 804. The push block 801 is compressed against the spring 803. The push block 801 drives the limit block 802 to separate from the limit hole 702. Then, pull the docking rod 605 upward along the axis of the rotating sleeve 602. The docking rod 605 and the limit groove 708 on the pull rod 701 are not engaged. The docking rod 605 no longer limits the vertical position of the pull rod 701. Then, hold the pull rod 701 to completely remove the magnesium rod 11 from the sewage head 5. Turn the unusable magnesium rod 11 counterclockwise, and then fix the new magnesium rod 11 on the top of the piston 703 clockwise. Slide the piston 703 and its magnesium rod 11 into the sewage head 5. The connecting rod 605 presses the push block 801, and the push block 801 slides into the slide groove 606. The push block 801 is compressed by the spring 803, and then the docking rod 605 is pushed upward along the axis of the rotating sleeve 602. The docking rod 605 is engaged with the limiting groove 708 on the pull rod 701. When the limiting block 802 corresponds to the limiting hole 702, the push block 801 is released, the spring 803 extends, and the spring 803 is against the push block 801. The push block 801 drives the limiting block 802 to engage with the limiting hole 702, so that the pull rod 701 and the docking rod 605 cannot move, thereby improving the stability. Then the electric hydraulic cylinder 2 contracts and automatically drives the piston 703 to move upward. The rubber ring 704 and the sealing ring 705 on the piston 703 seal the sewage head 5, making the installation of the magnesium rod 11 more convenient and quick.

[0028] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automatic magnesium rod replacement device for an electric water heater, comprising a water heater body (1), a mounting ring (4) fixed to the bottom end of the water heater body (1), and a sewage drain head (5) threadedly connected to the mounting ring (4); characterized in that, A sewage discharge structure (3) is installed at the sewage discharge port on the side wall of the sewage discharge head (5). The sewage discharge head (5) is a columnar structure with a hollow interior. An installation structure (7) for installing a magnesium rod (11) is slidably provided inside the sewage discharge head (5). The installation structure (7) includes a piston (703) slidably disposed inside the sewage discharge head (5) and a rubber ring (704) sleeved on the piston (703). The rubber ring (704) is slidably connected to the inner wall of the sewage discharge head (5). A frustum-shaped sealing ring (705) is installed at the top end of the piston (703). The sealing ring (705) abuts against the sewage discharge head (5). A magnesium rod (11) is threadedly connected to the top end of the piston (703). A pull rod (701) is fixed to the bottom end of the piston (703). A docking structure (6) is installed at the bottom end of the pull rod (701). The pull rod (701) and the docking structure (6) are limited by a limiting structure (8). An electric hydraulic cylinder (2) is installed on the side wall of the sewage discharge head (5). The electric hydraulic cylinder (2) drives the docking structure (6) to move up and down.

2. The automatic magnesium rod replacement device for an electric water heater according to claim 1, wherein: A driving block (10) is installed outside the sewage discharge head (5). The driving block (10) has a hexagonal prism structure.

3. The automatic magnesium rod replacement device for an electric water heater according to claim 1, characterized in that: A second sealing ring (9) is sleeved on the top end of the sewage discharge head (5). The second sealing ring (9) abuts against the installation ring (4).

4. The automatic magnesium rod replacement device for an electric water heater according to claim 1, wherein: The piston (703) and the pull rod (701) are fixed by a second bolt (707). The second bolt (707) is rotatably connected to the piston (703). The second bolt (707) is threadedly connected to the pull rod (701). A first sealing ring (706) abuts between the second bolt (707) and the piston (703). The magnesium rod (11) is located at the top end of the second bolt (707).

5. The automatic magnesium rod replacement device for an electric water heater according to claim 1, wherein: The docking structure (6) includes a top ring (601), a rotating sleeve (602), and a bottom ring (603). The bottom end of the electric hydraulic cylinder (2) is fixed with a bottom ring (603) and a top ring (601) by a first bolt (604). The top ring (601) abuts against the bottom end of the electric hydraulic cylinder (2). The rotating sleeve (602) is located between the top ring (601) and the bottom ring (603). The rotating sleeve (602) is rotatably connected to the bottom ring (603). A docking rod (605) with an arc-shaped end facing the pull rod (701) is installed on the rotating sleeve (602). The center of the arc of the docking rod (605) coincides with the axis of the rotating sleeve (602). The docking rod (605) is engaged with a limiting groove (708) on the pull rod (701).

6. The automatic magnesium rod replacement device for an electric water heater according to claim 5, wherein: The limiting structure (8) includes a push block (801) and a limiting block (802). A sliding groove (606) is provided at the bottom end of the docking rod (605). A push block (801) is slidably disposed inside the sliding groove (606). The thickness of the vertical section of the push block (801) is greater than the thickness of the arc-shaped section. A limiting block (802) is installed at the bottom end of the push block (801). The limiting block (802) is engaged with a limiting hole (702) at the bottom end of the pull rod (701).

7. An automatic magnesium rod replacement device for an electric water heater according to claim 6, characterized in that: A spring (803) is disposed between the push block (801) and the docking rod (605), and the spring (803) is located inside the slide groove (606).

8. An automatic magnesium rod replacement device for an electric water heater according to claim 7, characterized in that: An anti-dropout rod (804) is threadedly connected to the docking rod (605), the anti-dropout rod (804) penetrates the spring (803), and the push block (801) is slidably connected to the anti-dropout rod (804).

9. The automatic magnesium rod replacement device for an electric water heater according to claim 1, characterized in that: The sewage discharge structure (3) comprises a connector (305), the connector (305) being installed at the sewage discharge port of the sewage discharge head (5), a fixing sleeve (306) being threadedly connected to the connector (305), the fixing sleeve (306) being rotatably connected to the sewage discharge pipe (301), a gasket (307) being abutted between the sewage discharge pipe (301) and the connector (305), and the gasket (307) being located inside the fixing sleeve (306).

10. An automatic magnesium rod replacement device for an electric water heater according to claim 9, characterized in that: A fixing ring (302) is fixed to one end of the sewage pipe (301) away from the fixing sleeve (306), a hanging ring (303) is installed on the fixing ring (302), a hook (304) is installed on the water heater body (1), and the hanging ring (303) is hung on the hook (304).

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