High safety high pressure electrode hot water boiler

Abstract

The application discloses a high-safety high-pressure electrode hot water boiler, wherein an upper zero electrode and a lower zero electrode are arranged in a large tank. A lower end of a flow guide pipe is communicated with a space below a platform, and an upper end of the flow guide pipe is connected with the lower zero electrode. The electrode comprises a lower electrode for discharging with the lower zero electrode and an upper electrode for discharging with the upper zero electrode. Further, an upper movable shield moving up and down between the upper zero electrode and the upper electrode and a lower movable shield moving up and down between the lower zero electrode and the lower electrode are arranged. Two sections of a screw rod are positive and reverse screws, and the two sections are connected with the upper movable shield and the lower movable shield through a screw nut and a traction mechanism respectively. The double-layer movable shield corresponds to the two sections of the positive and reverse screw rods in series connection, the reserved stroke of the movable shield is reduced by half, and the total height of the equipment can be effectively reduced.

Description

Technical Field

[0001] This invention relates to a vertical electrode hot water boiler, and more particularly to a vertical electrode hot water boiler applicable to 35KV high voltage. Background Technology

[0002] A typical vertical electrode hot water boiler, as in existing technology, consists of a large tank and several internal components. The large tank has a vertical structure, primarily composed of a cylinder and elliptical heads at both ends, supported by three support brackets. A manhole is provided on the cylinder for easy commissioning and maintenance. Inside the lower head of the large tank, a platform is placed horizontally, with several water passages evenly distributed on the platform, directly opposite the electrodes suspended above it. A lower shield component is installed on the water passages. The lower shield component is made of insulating material and primarily serves to guide cold water while restricting the rotation of the movable shield. Several electrode access holes are opened on the upper head of the large tank, through which the electrodes extend into the tank, directly opposite the lower shield component. Each electrode has a corresponding zero-position electrode surrounding it. The relative positions of all zero-position electrodes must be identical, and all zero-position electrodes must maintain electrical continuity, forming a neutral point in a three-phase Y-connection with zero potential to ground. A movable shield is fitted between the zero-position electrode and its corresponding electrode. The movable shield is made of insulating material and is connected to a lead screw. Adjusting the height of the movable shield by raising and lowering the lead screw regulates the effective discharge area between the zero-position electrode and the other electrode, thereby adjusting the boiler's electrical power. In operation, cold water is introduced into the tank through the inlet of the lower head, guided by the lower shield component, and washes the electrodes. Discharge occurs between the electrodes and the zero-position electrode, heating the rapidly passing cold water. The movable shield adjusts the effective discharge area, thus regulating the electrical power.

[0003] The above-mentioned vertical electrode hot water boiler has the following shortcomings: First, the equipment is tall. Electrode boilers are generally installed in underground boiler rooms, and users are sensitive to the overall height of the equipment. To ensure the effective movement stroke of the movable shield, a long stroke space must be reserved. This requires the lower shield to be slender, increasing the overall height of the equipment, increasing the user's infrastructure investment, and limiting the scope of application of the equipment.

[0004] Secondly, there are electrical pathways at both the upper and lower parts of the zero-position electrode, posing a risk of leakage of high voltage and safety, which is particularly serious when using 35KV high voltage.

[0005] Third, installation is difficult. When installing the electrode, coaxiality with the zero-position electrode must be ensured. The electrode is a top-down suspended structure, and the outside of the electrode is covered with a brittle insulating material, making adjustment difficult. The zero-position electrode, on the other hand, is a fixed structure, requiring the electrode to be adjusted relative to the zero-position electrode. This installation and adjustment process consumes a significant amount of debugging and installation time.

[0006] Fourth, poor structural stability. The electrodes are vertically suspended, and cold water directly washes over them during operation, which easily causes them to sway. This leads to repeated changes in the discharge distance between the electrodes and the zero-position electrode, resulting in phase deviation of the three-phase current and instability, which affects normal power supply and stable operation of the equipment.

[0007] Fifth, the tank may become electrified. The zero-position electrode is directly connected to the inner wall of the tank. In case of abnormal operation, the tank may become electrified. During installation, insulating components must be installed on all external connection parts of the tank. This results in a complex structure, high cost, poor reliability, and difficulty in ensuring safety.

[0008] For example, Chinese patent application CN108151298A relates to "an electrode heating boiler," in which an isolation shield moves up and down along the axial direction of the phase electrode under the action of a lifting mechanism. When the isolation shield moves upward, the phase electrode is fully exposed to the water between the electrodes, increasing the heating power. When the isolation shield moves downward, the contact area between the electrode and the water decreases, reducing the heating power. The travel of the isolation shield covers the entire length of the phase electrode axis. In other words, the isolation shield must have a long travel space, increasing the overall height of the equipment and increasing the user's infrastructure investment.

[0009] For example, Chinese patent CN113390179B discloses a "vertical electrode hot water boiler device," which includes a lead screw that passes through a nut and is threaded into it. The lower end of the lead screw is located inside a central tube, and the upper end extends from the top of a large tank and is connected to a stepper motor. The stepper motor drives the lead screw to rotate, and the lead screw drives a movable shield to move up and down. When the movable shield is at its highest point, the opposing electrode plates discharge fully, resulting in maximum output power. When the movable shield is at its lowest point, the opposing electrode plates discharge minimally, resulting in minimum output power. This also presents the problem of requiring a relatively long travel space for the isolation shield. Summary of the Invention

[0010] The technical problem to be solved by this invention is to provide a high-safety, high-pressure electrode hot water boiler. First, it reduces the overall height of the equipment; second, it solves the problem of high-voltage leakage and electric shock; third, it improves the electrode adjustment capability and facilitates installation; fourth, it improves the stability of the electrode against erosion; and fifth, it solves the problem of the tank being electrified.

[0011] The technical solution of the present invention is as follows: A high-safety, high-pressure electrode hot water boiler includes a large tank with an outlet at the top and an inlet at the bottom. A platform is fixedly installed inside the large tank, dividing it into upper and lower independent spaces. The boiler also includes a longitudinally mounted lead screw connected to a motor located outside the large tank. An upper zero-position electrode and a lower zero-position electrode are fixedly installed inside the large tank. The upper zero-position electrode includes a cylindrical upper tank wall and an upper tank bottom fixed to the lower end of the upper tank wall, with a water passage hole for the upper zero-position electrode. The lower zero-position electrode includes a cylindrical lower tank wall and a lower tank bottom fixed to the lower end of the lower tank wall, with a water passage hole for the lower zero-position electrode. The hot water boiler also includes a guide pipe, the lower end of which is fixedly mounted on the platform and communicates with the space below the platform, and the upper end is connected to… The hot water boiler also includes an electrode fixedly installed inside the large tank, located at the lower end of the lower zero-position electrode. The electrode includes an upper electrode and a lower electrode connected to each other. The lower electrode is used to generate heat by discharging with the lower zero-position electrode, and the upper electrode is used to generate heat by discharging with the upper zero-position electrode. The upper electrode is connected to an upper copper rod for introducing high-voltage electricity into the large tank. The hot water boiler also includes an upper movable shield that is cylindrical and can move up and down between the upper zero-position electrode and the upper electrode, and a lower movable shield that is cylindrical and can move up and down between the lower zero-position electrode and the lower electrode. The upper and lower movable shields are nested together. The upper and lower sections of the lead screw are positive and negative threads, respectively. The upper and lower sections are connected to the upper and lower movable shields through a nut and a traction mechanism. When the motor drives the lead screw to rotate, the upper and lower movable shields move towards each other or away from each other.

[0012] Preferably, the hot water boiler further includes a side shielding mesh; the upper and lower ends of the side shielding mesh are respectively connected to the upper zero-position electrode and the lower zero-position electrode.

[0013] Preferably, the upper barrel wall and the lower barrel wall are fixedly connected to the large tank by insulating supports.

[0014] Preferably, the bottom of the upper barrel is formed by two semicircular rings joined together to form a complete circular ring.

[0015] Preferably, a ring plate is fixedly installed on the upper end of the lower barrel wall; the ring plate is composed of two semi-circular rings joined together to form a complete circle.

[0016] Preferably, the hot water boiler further includes anchor bolts made of insulating material; the anchor bolts tighten and fix the lower end of the lower electrode to the bottom of the lower tank.

[0017] Preferably, the guide tube is made of insulating material.

[0018] Compared with the prior art, the present invention has the following beneficial effects.

[0019] First, this invention employs a series-connected electrode design, utilizing the geometric space between the upper and lower electrodes to arrange a double-layered movable shield, thereby reducing the overall height of the equipment. The double-layered movable shield corresponds to two series-connected positive and negative lead screws, thus reducing the reserved stroke of the movable shield by half, effectively lowering the overall height of the equipment.

[0020] Secondly, the upper zero-position electrode component, the lower zero-position electrode component, and the side shielding mesh together form a complete squirrel cage structure, creating a zero-position equipotential structure, which can effectively prevent high-voltage leakage and electric shock problems, and improve equipment safety.

[0021] Third, a bucket-style zero-position electrode design is adopted, which utilizes the area of ​​the bottom of the bucket to expand the area of ​​the zero-position electrode, reduce the height of the zero-position electrode, and thus reduce the overall height of the equipment. The bottom of the zero-position electrode bucket adopts a segmented design, which facilitates disassembly and assembly, and is beneficial for installation and maintenance.

[0022] Fourth, the use of movable electrode design increases the adjustment range of the electrode during installation, which helps to ensure electrode alignment and reduces installation difficulty.

[0023] Fifth, an electrode anchoring design is adopted, changing the suspended electrode with one end fixed to a stretched electrode with one end fixed and the other simply supported, effectively improving the electrode's erosion resistance stability. The electrode is less prone to shaking, and the discharge distance between the electrode and the zero-position electrode is stable, ensuring the stability of the three-phase current.

[0024] Sixth, a floating zero-position electrode design is adopted, which is insulated from the tank body, fundamentally solving the problem of the tank body being electrified. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the high-pressure electrode hot water boiler of the present invention. The diagram shows the relative positions of the electrode, the zero-position electrode, and the movable shield under maximum power conditions.

[0026] Figure 2 This is a side view of the zero-position electrode in an embodiment of the present invention.

[0027] Figure 3 This is a top view of the zero-position electrode in an embodiment of the present invention.

[0028] Figure 4 This is a side view of the zero-position electrode in an embodiment of the present invention.

[0029] Figure 5 This is a top view of the zero-position electrode in an embodiment of the present invention (the annular plate is omitted in this figure).

[0030] Figure 6 This is a schematic diagram of the electrode structure according to an embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram showing the axial positional relationship of the electrode, the zero-position electrode, and the upper and lower movable shields according to an embodiment of the present invention. (The side shielding mesh is omitted in this diagram.) Figure 8 This is a schematic diagram showing the relative positional relationship between the electrode, the zero-position electrode, and the movable shield under the minimum power state in an embodiment of the present invention.

[0032] In the diagram: 1. Large tank; 2. Platform; 3. Guide pipe; 4. Anchor bolt; 5. Insulating support; 6. Lower zero-position electrode; 6-1. Lower tank wall; 6-2. Lower tank bottom; 6-2-1. Lower zero-position electrode water passage hole; 6-3. Ring plate; 7. Electrode; 7-1. Upper copper rod; 7-2. Upper electrode; 7-3. Inner connecting plate; 7-4. Lower copper rod; 7-5. Lower electrode; 7-6. Connecting nut; 8. Lower movable shield; 9. Lead screw; 10. Upper movable shield; 11. Upper zero-position electrode; 11-1. Upper tank wall; 11-2. Upper tank bottom; 11-2-1. Upper zero-position electrode water passage hole; 12. Insulating sleeve; 13. Water outlet; 14. Manhole; 15. Water inlet; 16. Side shielding mesh. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the embodiments and accompanying drawings.

[0034] like Figure 1 An embodiment of the high-pressure electrode hot water boiler of the present invention includes a large tank 1, wherein the large tank 1 is carbon... Made of steel, the tank comprises a cylinder and elliptical upper and lower end caps located at its upper and lower ends, respectively. A manhole 14 is provided on one side of the cylinder for easy maintenance. The upper end cap has an outlet 13, and the lower end cap has an inlet 15. The bottom of the lower end cap is fixed to a foundation using a support bracket (the base and foundation are omitted in the attached diagram). A platform 2, made of carbon steel plate, is fixedly installed inside the large tank 1 and is directly connected to the lower end cap of the large tank 1. The platform 2 divides the large tank 1 into two independent spaces, forming a relatively enclosed cold water zone with the lower end cap to prevent mixing of hot and cold water, while also serving as an installation and maintenance platform. The manhole 14 is located above the platform 2.

[0035] This embodiment also includes an upper zero-position electrode 11 and a lower zero-position electrode 6 located directly below the upper zero-position electrode 11, both of which are made of carbon steel.

[0036] like Figure 2 and Figure 3The upper zero-position electrode 11 has a barrel-shaped structure, including a cylindrical upper barrel wall 11-1 made of carbon steel and an upper barrel bottom 11-2 made of carbon steel fixed to the lower end of the upper barrel wall 11-1. The upper barrel wall 11-1 is fixedly connected to the inner wall of the large tank 1 by an insulating support 5. The upper barrel bottom 11-2 has several elongated holes for water passage of the upper zero-position electrode 11-2-1.

[0037] like Figure 4 and Figure 5 The lower zero-position electrode 6 is a covered barrel-type structure, including a cylindrical lower barrel wall 6-1 made of carbon steel and a lower barrel bottom 6-2 made of carbon steel fixed to the lower end of the lower barrel wall 6-1. The lower barrel bottom 6-2 has several elongated lower zero-position electrode water passage holes 6-2-1. The lower barrel wall 6-1 is fixedly connected to the inner wall of the large tank 1 by an insulating support 5. The insulating support 5 is preferably made of insulating ceramic.

[0038] Still Figure 1 This embodiment also includes a plastic guide tube 3. The lower end of the guide tube 3 is fixedly mounted on the platform 2 and communicates with the space below the platform 2. The upper part of the guide tube 3 is funnel-shaped and connected to the lower end of the lower zero-position electrode 6.

[0039] This embodiment also includes electrodes 7 fixedly disposed within the large tank 1. The electrodes 7 are arranged in a series connection. For example... Figure 6 The electrode 7 includes an upper electrode 7-2 and a lower electrode 7-5. The upper end of the upper electrode 7-2 is connected to an upper copper rod 7-1 for introducing high-voltage electricity into the large tank 1, and the lower end is connected to the lower electrode 7-5 via a lower copper rod 7-4. The lower copper rod 7-4 and the lower electrode 7-5, as well as the lower copper rod 7-4 and the upper electrode 7-2, are respectively connected to each other via an inner connecting plate 7-3 and a connecting nut 7-6.

[0040] The lower electrode 7-5 is used to generate heat through discharge with the lower zero-position electrode 6, thus heating the cold water. The upper electrode 7-2... It is used to generate heat through discharge with the upper zero electrode 11, further heating the water.

[0041] like Figure 1 , Figure 7 and Figure 8This embodiment also includes an upper movable shield 10, which is cylindrical and can move up and down between the upper zero-position electrode 11 and the upper electrode 7-2. The upper movable shield 10 is made of plastic. It also includes a lower movable shield 8, which is cylindrical and can move up and down between the lower zero-position electrode 6 and the lower electrode 7-5. The lower movable shield 8 is made of plastic. The upper movable shield 10 and the lower movable shield 8 are nested within each other. If the upper movable shield 10 is nested within the lower movable shield 8, a longitudinal groove is required in the upper part of the lower movable shield 8 so that the traction mechanism of the upper movable shield 10 can pass through the lower movable shield 8 and move up and down during nesting. If the upper movable shield 10 is nested outside the lower movable shield 8, a longitudinal groove is required in the upper part of the upper movable shield 10 so that the traction mechanism of the lower movable shield 8 can pass through the upper movable shield 10 and move up and down during nesting.

[0042] This embodiment also includes a lead screw 9 longitudinally positioned along the axis of the large tank 1, the lead screw 9 being made of steel. The upper end of the lead screw 9 is connected via a coupling to a motor mounted on the outer side of the top of the large tank 1 (the coupling and motor are omitted in the figure). The upper end of the lead screw 9 can also be connected via a pin to a drive shaft, which extends upwards through the large tank 1 and is then connected via a coupling to the power output shaft of the motor. The upper and lower sections of the lead screw 9 are forward and reverse leads, respectively, connected to the upper movable shield 10 and the lower movable shield 8 via a nut and a traction mechanism. When the servo motor drives the lead screw 9 to rotate, the nut and traction mechanism connected to the upper and lower sections cause the upper movable shield 10 and the lower movable shield 8 to move towards or away from each other. This is used to adjust the discharge area between the upper electrode 7-2 and the upper zero-position electrode 11, and the discharge area between the lower electrode 7-5 and the lower zero-position electrode 6, thereby achieving the purpose of adjusting the electric power of the electrode hot water boiler.

[0043] This embodiment also includes an insulating sleeve 12 made of ceramic material for covering the upper copper rod 7-1. The lower end of the insulating sleeve 12 is sealed to the upper electrode 7-2 to ensure the water resistance of the upper copper rod 7-1 to external electrical structures and the electrical insulation of the large tank 1. The upper end of the insulating sleeve 12 extends out from the upper end of the large tank 1.

[0044] This embodiment also includes a side shielding mesh 16 made of conductive material. The side shielding mesh 16 is cylindrical, with the upper zero-position electrode 11 and the lower zero-position electrode 6 connected to its upper and lower ends, respectively. Specifically, the side shielding mesh 16 is a stainless steel plate mesh, formed by bending a steel plate with several elongated holes into a cylindrical shape. The side shielding mesh 16 is used for the electrical connection between the upper zero-position electrode 11 and the lower zero-position electrode 6. The upper zero-position electrode 11, the lower zero-position electrode 6, and the side shielding mesh 16 form a complete squirrel cage structure, creating a zero-position equipotential structure, which can effectively prevent leakage current.

[0045] Furthermore, the upper barrel bottom 11-2 is composed of two semi-circular rings joined together to form a complete circular ring. The insulating sleeve 12 passes through the central hole of this complete circular ring.

[0046] A plastic ring plate 6-3 is fixedly installed on the upper end of the lower barrel wall 6-1. The ring plate 6-3 is composed of two semi-circular rings joined together to form a complete circle. The inner circular hole of the ring plate 6-3 is used to limit the large-amplitude swing of the lower movable shield 8 driven by the nut, and to prevent cold water short circuit, diverting the water flowing between the lower electrode 7-5 and the lower movable shield 8 to the space between the upper electrode 7-2 and the upper movable shield 10 for continued heating. The inner circular hole of the upper barrel bottom 11-2 is used to limit the large-amplitude swing of either the lower movable shield 8 or the upper movable shield 10 driven by the nut.

[0047] The purpose of both the upper barrel bottom 11-2 and the ring plate 6-3 being composed of two semicircular rings joined together to form a complete circle is to facilitate installation. During installation, the coaxiality of electrode 7 with the upper zero-position electrode 11 and the lower zero-position electrode 6 is first adjusted before installing the barrel bottom 11-2 and the ring plate 6-3. Furthermore, due to limitations on the permissible size of the manhole 14, the upper barrel bottom 11-2 and the ring plate 6-3 must be designed as semicircles for passage.

[0048] The electrodes 7 in the same large tank 1 generally have three arranged in a circumferential 120° pattern, namely electrodes A, B and C, and the upper zero electrode 11 and the lower zero electrode 6 correspond one-to-one with the electrodes 7.

[0049] The total area of ​​the upper zero-position electrode water passage 11-2-1 should be several times the minimum flow area of ​​the guide pipe 3 to ensure smooth flow of hot water. The total area of ​​the lower zero-position electrode water passage 6-2-1 should be several times the minimum flow area of ​​the guide pipe 3 to ensure smooth flow of cold water.

[0050] Furthermore, this embodiment also includes a plastic anchor bolt 4. The anchor bolt 4 tightens and fixes the lower end of the lower electrode 7-5 to the lower barrel bottom 6-2 of the lower zero-position electrode 6, preventing the lower electrode 7-5 from swinging and improving the mechanical stability of the electrode 7. The anchor bolt 4 has fine threads and should have a spring washer or other relaxation structure when tightened.

[0051] The platform 2 also serves to support the guide pipe 3 and the lead screw 9. When the upper end of the lead screw 9 is connected to the power unit, the lower end is mounted on the platform 2 via a bearing.

[0052] The following issues need to be considered during the design process.

[0053] First, the upper electrode 7-2 and the lower electrode 7-5 are connected by bolts through the lower copper rod 7-4. The lower copper rod 7-4 can be flexibly adjusted in the radial direction through the elongated hole, and in the axial direction through the threads at both ends of the lower copper rod 7-4.

[0054] Second, the lower zero electrode 6, the upper and lower zero electrodes 11, and the metal parts such as the large tank 1 and the lead screw 9. The distance should be designed reasonably to prevent electrical breakdown from causing the equipment casing to become a zero-position electrode, resulting in the equipment casing becoming electrified.

[0055] Third, the coaxiality between electrode 7 and lower zero electrode 6, and between upper and lower zero electrodes 11, should be ensured to guarantee the balance of three-phase current.

[0056] Fourth, anchor bolt 4 should be made of insulating material and have anti-loosening structures such as spring washers.

[0057] Fifth, design the water flow channel reasonably to ensure that cold water flows smoothly through the vicinity of electrode 7 and flows out smoothly, reducing short circuits and avoiding congestion.

[0058] Sixth, since the equipment contains stainless steel components, the concentration of chloride ions in the water should be controlled according to the requirements for stainless steel, and conductive salts should avoid chloride salts.

[0059] The equipment workflow is illustrated below.

[0060] Cold water (such as room temperature water) enters the space below platform 2 inside the large tank 1 through inlet 15. The guide pipe 3 guides the cold water below platform 2 into the space between electrode 7 and lower zero electrode 6, and between electrode 7 and upper zero electrode 11 for heating. Hot water is discharged through outlet 13.

[0061] A servo motor drives the lead screw 9 to rotate. The forward and reverse leads of the lead screw 9 drive the upper movable shield 10 and the lower movable shield 8 to move up and down via the upper and lower nuts and the traction mechanism, respectively. When the upper movable shield 10 and the lower movable shield 8 are closed at the center position, the electrode 7 fully discharges with the upper zero-position electrode 11 and the lower zero-position electrode 6, and the output power is at its maximum. Figure 1 When the upper movable shield 10 and the lower movable shield 8 are at their maximum separation, the discharge between electrode 7 and the upper zero-position electrode 11 and the lower zero-position electrode 6 is at its minimum, and the output power is at its minimum. Figure 8 .

Claims

1. A high-safety high-pressure electrode hot water boiler, comprising a large tank (1) with an outlet (13) at the upper end and an inlet (15) at the lower end, a platform (2) fixedly installed inside the large tank (1), the platform (2) dividing the large tank (1) into two independent spaces, and further comprising a lead screw (9) longitudinally arranged inside the large tank (1), the lead screw (9) being connected to a motor located outside the large tank (1), characterized in that: The large tank (1) is fixedly equipped with an upper zero-position electrode (11) and a lower zero-position electrode (6) located below the upper zero-position electrode (11); the upper zero-position electrode (11) includes a cylindrical upper barrel wall (11-1) and an upper barrel bottom (11-2) fixed to the lower end of the upper barrel wall (11-1) and having an upper zero-position electrode water passage hole (11-2-1); the lower zero-position electrode (6) includes a cylindrical lower barrel wall (6-1) and a lower barrel bottom (6-2) fixed to the lower end of the lower barrel wall (6-1) and having a lower zero-position electrode water passage hole (6-2-1). The hot water boiler also includes a guide pipe (3), the lower end of which is fixedly installed on the platform (2) and communicates with the space below the platform (2), and the upper end is connected to the lower end of the lower zero electrode (6); the hot water boiler also includes an electrode (7) fixedly installed in the large tank (1); the electrode (7) includes an upper electrode (7-2) and a lower electrode (7-5) connected to each other, the lower electrode (7-5) is used to generate heat by discharging with the lower zero electrode (6), and the upper electrode (7-2) is used to generate heat by discharging with the upper zero electrode (11); wherein the upper electrode (7-2) is connected to an upper electrode for introducing high voltage electricity into the large tank (1). Copper rod (7-1); The hot water boiler also includes an upper movable shield (10) that can move up and down between the upper zero electrode (11) and the upper electrode (7-2) and is cylindrical, and a lower movable shield (8) that can move up and down between the lower zero electrode (6) and the lower electrode (7-5) and is cylindrical. The upper movable shield (10) and the lower movable shield (8) are nested together; The upper and lower sections of the lead screw (9) are positive and negative threads, and the upper and lower sections are connected to the upper movable shield (10) and the lower movable shield (8) respectively through a nut and a traction mechanism. When the motor drives the lead screw (9) to rotate, the upper movable shield (10) and the lower movable shield (8) move towards each other or away from each other.

2. The high-safety high-pressure electrode hot water boiler as described in claim 1, characterized in that: The hot water boiler also includes a side shielding mesh (16); the upper and lower ends of the side shielding mesh (16) are respectively connected to the upper zero electrode (11) and the lower zero electrode (6).

3. The high-safety high-pressure electrode hot water boiler as described in claim 1 or 2, characterized in that: The upper barrel wall (11-1) and the lower barrel wall (6-1) are fixedly connected to the large tank (1) by insulating supports (5).

4. The high-safety high-pressure electrode hot water boiler as described in claim 1 or 2, characterized in that: The bottom of the upper barrel (11-2) is composed of two semicircular rings joined together to form a complete circular ring.

5. The high-safety high-pressure electrode hot water boiler as described in claim 1 or 2, characterized in that: A ring plate (6-3) is fixedly installed on the upper end of the lower barrel wall (6-1); the ring plate (6-3) is composed of two semi-circular rings joined together to form a complete circular ring.

6. The high-safety high-pressure electrode hot water boiler as described in claim 1 or 2, characterized in that: The hot water boiler also includes an insulating anchor bolt (4); the anchor bolt (4) pulls the lower end of the lower electrode (7-5) tight and fixes it on the bottom of the lower tank (6-2).

7. The high-safety high-pressure electrode hot water boiler as described in claim 1 or 2, characterized in that: The guide tube (3) is made of insulating material.

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