Electrode insulation structure of electrode boiler

Abstract

The utility model provides an electrode insulation structure of an electrode boiler, which belongs to the field of electrode boiler equipment and comprises a boiler body, a copper rod flange penetrates through the top of the boiler body, an electrode interface flange is sleeved outside the copper rod flange, and a ceramic insulation device is arranged between the copper rod flange and the electrode interface flange. The copper rod flange and the electrode interface flange are fixed through a screw and a nut, the screw is sleeved with a ceramic insulation pipe, the contact faces of the screw and flange plates of the copper rod flange and the electrode interface flange are each provided with an insulation spacer, and a boiler inner barrel in the boiler body is connected with the copper rod flange through an electrode. An insulating layer is arranged between the inner wall and the outer wall of the boiler inner cylinder wall, an insulating structure is redesigned, so that the electrode boiler can bear higher pressure and generate steam with higher temperature, and the highest pressure can reach 10Mpa.

Description

Technical Field

[0001] The utility model belongs to the field of electrode boiler equipment, in particular to an electrode insulation structure of an electrode boiler. Background Art

[0002] An electrode boiler is a boiler system that uses electricity to generate thermal energy. It converts electricity into thermal energy to heat water into steam or hot water to heat rooms or provide hot water. Compared with traditional coal-fired boilers or gas-fired boilers, electrode boilers do not require fuel and only require a power supply to work. Therefore, they do not produce smoke, exhaust gas, and ash, and have less impact on the environment. Secondly, electrode boilers have a fast start-up speed, a short response time, can quickly reach the required temperature, and have high energy efficiency. In addition, electrode boilers have a simple structure, are easy to maintain, and can achieve automatic control, reducing operating costs and labor management costs.

[0003] An electrode boiler is a device that uses high-voltage electrodes to heat water in a furnace to generate high-temperature steam or water. In an environment with gas or water, high requirements are placed on the sealing of the overall porcelain insulation sleeve of the electrode boiler. However, the existing porcelain insulation sleeve of an electrode boiler is susceptible to steam or hot water leakage due to the principle of thermal expansion and contraction.

[0004] The sealing of the electrodes of traditional electrode boilers relies on two metal flanges to fix a ceramic tube with a bulge in the middle to insulate the copper rod connecting the electrodes from the boiler body. This connection method can be used normally when the boiler pressure is 2MPa, but if a higher pressure electrode boiler is to be produced, this structure may cause leakage and possible damage due to the large temperature difference between the upper and lower ceramic tubes and uneven stress.

[0005] like Figure 1 As shown, CN215062910U provides an electrode introduction structure and a high-voltage electrode boiler having the introduction structure, wherein the electrode introduction device comprises an electrode connecting rod (A1), a ceramic tube (A6), and an electrode (A12), wherein the electrode (A12) connecting rod is covered with a ceramic tube (A6), wherein the middle part of the ceramic tube (A6) is provided with a boss, wherein the upper and lower sides of the boss are designed as inclined surfaces, and the outer shell of the ceramic tube (A6) is covered with an upper pressure flange (A7), an upper flat sealing gasket (A8), an upper special-shaped sealing gasket (A9), a lower special-shaped sealing gasket (A10), a lower flat sealing gasket (A11), and a positioning ring (A14) in sequence. The patent mainly insulates the electrode connecting rod (A1) through the ceramic tube (A6), and the main disadvantage of this structure is that the electrode connecting rod (A1) and the ceramic above the upper pressure flange (A7) are subjected to unbalanced forces, and after long-term high-temperature use, water leakage and ceramic rupture may occur. Utility Model Content

[0006] In order to achieve the purpose of insulating the electrode of a high-pressure electrode boiler, this patent provides an electrode boiler electrode insulation structure, redesigns the insulation structure so that the electrode boiler can withstand higher pressure and generate higher temperature steam, with a maximum pressure of 10Mpa.

[0007] The utility model adopts the following technical solutions to solve the above problems:

[0008] An electrode insulation structure for an electrode boiler comprises a boiler body, a copper rod flange is penetrated through the top of the boiler body, an electrode interface flange is sleeved on the outside of the copper rod flange, a ceramic insulation device is arranged between the copper rod flange and the electrode interface flange, the copper rod flange and the electrode interface flange are fixed by screws and nuts, a ceramic insulation tube is sleeved on the outside of the screw, and insulating gaskets are arranged on the contact surfaces between the screw and the copper rod flange and the electrode interface flange.

[0009] Furthermore, the upper part of the ceramic insulation device is a disc structure, and the lower part is integrally connected with a hollow cylindrical ceramic tube, whose cross section is "T" shaped, and the lower hollow cylindrical ceramic tube is sleeved between the copper rod flange and the electrode interface flange.

[0010] Furthermore, the ceramic insulating device is connected with the flanges of the electrode interface flange and the copper rod flange by a metal wound gasket.

[0011] Furthermore, the insulating gasket is a mica gasket, or a gasket made of the same type of insulating material.

[0012] Furthermore, a boiler inner tube is provided inside the boiler body, and the boiler inner tube is connected to the copper rod flange through an electrode.

[0013] Furthermore, the wall of the inner drum of the boiler is divided into an inner wall and an outer wall, and an insulating layer is provided between the inner wall and the outer wall.

[0014] Furthermore, the insulating layer is made of polyimide or polysilazane polymer.

[0015] Furthermore, the boiler inner tube is a cylindrical metal cylinder, and a plurality of supporting legs are evenly arranged on its outer wall.

[0016] Furthermore, a plurality of boiler shell support feet are evenly arranged inside the boiler body, and positions of the boiler shell support feet correspond to positions of the support feet.

[0017] Furthermore, the boiler shell support legs are fixedly connected to the support legs, and the boiler inner tube is fixed inside the boiler body.

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model adopts a copper rod flange structure, in which the copper rod and the flange are made into one piece. The flange is made of copper and connected to the copper rod. The advantage of this is that there is no gap between the flange and the copper rod, which can greatly increase the use pressure of the boiler;

[0020] 2. The electrode interface flange and the copper rod flange are insulated by ceramic insulation devices. They are heated evenly and are all in a high temperature state. There is no large area in the cooling air. Therefore, they are evenly stressed and are subjected to vertical stress and pressure, which further demonstrates the advantage of ceramics' strong compressive resistance.

[0021] 3. The boiler shell legs are directly fixed and connected to each other, eliminating the original ceramic insulator, improving the situation where the ceramic insulator is corroded and broken in long-term high-temperature steam, avoiding accidents, ensuring the safe operation of the high-voltage electrode boiler, and at the same time increasing the service life of the boiler inner tube and reducing maintenance costs;

[0022] 4. The inner tube of the boiler adopts a double-layer structure, with an insulating layer between the inner and outer layers, which can operate stably for a long time at a saturation temperature of about 310℃ corresponding to a pressure of 10MPa;

[0023] 5. The ceramic insulator in the existing boiler structure has a small contact area and a high pressure. The use of the insulating layer increases the contact area and applies the downward pressure of the water in the boiler inner tube more evenly to the insulating layer, making the insulating layer less susceptible to corrosion under high temperature and high pressure, and will not cause a decrease in strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present utility model, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of an electrode introduction device in the background technology;

[0026] Figure 2 This is a schematic diagram of the overall structure of the electrode boiler in the utility model;

[0027] Figure 3 It is a schematic diagram of the insulation structure of the electrode copper rod of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the electrode interface flange and the copper rod flange of the utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the ceramic insulation device of the utility model;

[0030] Figure 6 It is a structural schematic diagram of the connection between the flange and the copper rod flange of the utility model;

[0031] Figure 7 It is a schematic diagram of the cross-sectional structure of an existing electrode boiler;

[0032] Figure 8 This is a schematic diagram of the cross-sectional structure of the electrode boiler in the utility model;

[0033] Fig. 9 This is a schematic diagram of the internal structure of the electrode boiler of the utility model.

[0034] In the figure,

[0035] A1-electrode connecting rod; A2-connecting nut; A3-butterfly spring; A4-gasket; A5-flat sealing gasket 1; A6-ceramic tube; A7-upper pressure flange; A8-upper flat sealing gasket; A9-upper special-shaped sealing gasket; A10-lower special-shaped sealing gasket; A11-lower flat sealing gasket; A12-electrode; A13-flat sealing gasket 2; A14-positioning ring; A15-furnace body;

[0036] 1- boiler body; 2- electrode interface flange; 3- copper rod flange; 4- ceramic insulation device; 5- ceramic insulation tube; 6- insulation gasket; 7- screw; 8- nut; 9- support foot; 10- ceramic insulator; 11- boiler shell support foot; 12- electrode; 13- boiler inner tube; 14- insulation layer. DETAILED DESCRIPTION

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] like Figure 2-4As shown, the utility model provides an electrode insulation structure of an electrode boiler, including a boiler body 1, a copper rod flange 3 is penetrated on the top of the boiler body 1, the copper rod and the flange of the traditional electrode boiler are two devices, and a ceramic insulating tube is needed to isolate the two, but due to the large temperature difference between the upper and lower parts, long-term uneven stress and other reasons, the boiler cannot be used under high pressure. In order to improve this situation, the utility model makes the copper rod and the flange into one piece, the flange is made of copper and connected to the copper rod, the advantage of this is that there is no gap between the flange and the copper rod, which can greatly increase the use pressure of the boiler; the copper rod flange 3 is provided with an electrode interface flange 2 on the outside, which is used to fix the copper rod on the boiler body 1, but in order to avoid the copper rod flange 3 from contacting the electrode interface flange 2 and the furnace wall of the boiler body 1, a ceramic insulating device 4 is provided between the copper rod flange 3 and the electrode interface flange 2.

[0039] like Figure 5 As shown, the upper part of the ceramic insulation device 4 is a disc structure, and the lower part is integrally connected with a hollow cylindrical ceramic tube, whose cross-section is "T"-shaped. The lower hollow cylindrical ceramic tube is sleeved between the copper rod flange 3 and the electrode interface flange 2 to ensure the insulation effect between the copper rod flange 3 and the electrode interface flange 2.

[0040] The ceramic insulating device 4 is connected to the flanges of the electrode interface flange 2 and the copper rod flange 3 by a metal wound gasket (not shown in the figure) to reduce the gap between the ceramic insulating device 4 and the copper rod flange 3 and the electrode interface flange 2 to balance the stress.

[0041] like Figure 6 As shown, the copper rod flange 3 and the electrode interface flange 2 are fixed by screws 7 and nuts 8. The outer side of the screw 7 is connected to a ceramic insulating tube 5. The ceramic insulating tube 5 itself is subjected to vertical pressure from the screws 7 and nuts 8, but is not subjected to force in the horizontal direction, and is used to insulate the screws 7 from the flange 3 and the flange on the electrode interface flange 2. The contact surfaces of the screws 7 and the flanges of the copper rod flange 3 and the electrode interface flange 2 are all provided with insulating gaskets 6, which are mica gaskets or gaskets made of the same type of insulating material, and are used to insulate the screws 7 and nuts 8 from the copper rod flange 3 and the electrode interface flange 2.

[0042] like Figure 7As shown, the existing boiler inner tube 13 is composed of a cylindrical barrel and a support foot 9, the support foot 9 is fixed on the ceramic insulator 10, and the ceramic insulator 10 is fixed on the boiler shell support foot 11. Ordinary electrode steam boilers generally have a temperature of about 200°C and a pressure of less than 2MPa. During use, the ceramic insulator 10 is corroded in long-term high-temperature steam, and both the ceramic itself and the glaze will be corroded. For ordinary pressure electrode steam boilers, this corrosion rate is relatively slow, and the ceramic insulator 10 generally needs to be replaced every 2-3 years. However, for electrode steam boilers with a pressure of up to 10MPa, the ceramic insulator will corrode rapidly, and the strength will drop to an unusable state in less than 1 year or even shorter. It may suddenly break, causing the current to be transferred from the boiler inner tube 13 to the boiler shell, causing an accident.

[0043] like Figure 8-9 As shown, a boiler inner tube 13 is provided inside the boiler body 1 of the utility model, and the boiler inner tube 13 is connected to the copper rod flange 3 through an electrode 12. The wall of the boiler inner tube 13 is divided into an inner wall and an outer wall, and an insulating layer 14 is provided between the inner wall and the outer wall. The insulating layer 14 is composed of polyimide or polysilazane polymer. The boiler inner tube 13 is a cylindrical metal cylinder, and a plurality of legs 9 are evenly provided on its outer wall. A plurality of boiler shell legs 11 are correspondingly provided inside the boiler body 1. In this embodiment, the number of legs 9 and boiler shell legs 11 is 4, and each boiler shell leg 11 is fixedly connected to the leg 9 to fix the boiler inner tube 13 inside the boiler body 1.

[0044] The boiler inner tube 13 is made of conductive metal. The electrodes 12 connected by copper rods discharge the boiler inner tube, so that the current passes through the water with a certain conductivity in the boiler inner tube to do work and heat it into steam. The electrode 12 is a schematic diagram, and the ceramic insulator 10 is omitted. The original boiler inner tube 13 is changed into three layers. The outer layer and the inner layer are made of the same metal as the original boiler inner tube material. An insulating layer 14 is added between the two. The insulating layer 14 is made of polyimide or polysilazane polymer. The two can operate stably for a long time at a saturation temperature of about 310°C corresponding to a pressure of 10MPa. At the same time, the disadvantages of the original ceramic small contact area and high pressure are changed into a large contact area, and the downward pressure of the water in the boiler inner tube 13 is more evenly applied to the insulating layer 14, so that the insulating layer is less likely to be corroded under high temperature and high pressure, resulting in a decrease in strength.

[0045] The above embodiments describe the present invention in detail, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of application of the present invention shall still fall within the scope of the patent coverage of the present invention.

Claims

1. An electrode boiler electrode insulation structure, comprising a boiler body (1), characterized in that: A copper rod flange (3) is provided through the top of the boiler body (1), an electrode interface flange (2) is sleeved on the outside of the copper rod flange (3), a ceramic insulating device (4) is provided between the copper rod flange (3) and the electrode interface flange (2), the copper rod flange (3) and the electrode interface flange (2) are fixed by screws (7) and nuts (8), a ceramic insulating tube (5) is sleeved on the outside of the screws (7), and insulating gaskets (6) are provided on the contact surfaces of the screws (7) and the copper rod flange (3) and the electrode interface flange (2).

2. The electrode boiler electrode insulation structure according to claim 1, characterized in that: The upper part of the ceramic insulating device (4) is a disc structure, and the lower part is integrally connected with a hollow cylindrical ceramic tube, whose cross section is "T". The lower hollow cylindrical ceramic tube of the ceramic insulating device (4) is sleeved between the copper rod flange (3) and the electrode interface flange (2).

3. The electrode boiler electrode insulation structure according to claim 1, characterized in that: The ceramic insulating device (4) is connected to the electrode interface flange (2) and the flange plate of the copper rod flange (3) by a metal winding gasket.

4. The electrode boiler electrode insulation structure according to claim 1, characterized in that: The insulating gasket (6) is a mica gasket, or a gasket made of the same type of insulating material.

5. An electrode boiler electrode insulation structure according to any one of claims 1 to 4, characterized in that: A boiler inner tube (13) is provided inside the boiler body (1), and the boiler inner tube (13) is connected to the copper rod flange (3) via an electrode (12).

6. The electrode boiler electrode insulation structure according to claim 5, characterized in that: The wall of the boiler inner tube (13) is divided into an inner wall and an outer wall, and an insulating layer (14) is provided between the inner wall and the outer wall.

7. The electrode boiler electrode insulation structure according to claim 6, characterized in that: The insulating layer (14) is made of polyimide or polysilazane polymer.

8. The electrode boiler electrode insulation structure according to claim 5, characterized in that: The boiler inner tube (13) is a cylindrical metal cylinder, and a plurality of supporting legs (9) are evenly arranged on its outer wall.

9. The electrode boiler electrode insulation structure according to claim 8, characterized in that: A plurality of boiler shell support feet (11) are evenly arranged inside the boiler body (1), and the positions of the boiler shell support feet (11) correspond to the positions of the support feet (9).

10. The electrode boiler electrode insulation structure according to claim 9, characterized in that: The boiler shell support foot (11) is fixedly connected to the support foot (9), and the boiler inner tube (13) is fixed inside the boiler body (1).

Images