Electrode boiler connection device

Abstract

This invention relates to the field of electrode boiler technology, specifically to an electrode boiler wiring device. The electrode boiler wiring device includes a sleeve passing through the boiler casing. The sleeve includes an inner shell portion and an outer shell portion located within the boiler casing, arranged separately. The inner shell portion has a cylindrical structure, and a first sealing structure is provided between the upper end of the inner shell portion and the lower end of the outer shell portion. A conductive rod includes a conductive rod body and a mounting base. The mounting base is fixed to the lower end of the conductive rod body. A second sealing structure is provided between the lower end of the inner shell portion and the mounting base to seal the lower end of the inner shell portion. A locking nut is provided at the end of the conductive rod body that extends upward through the sleeve. The locking nut is threadedly connected to the conductive rod body to press against the outer shell portion. Because the inner shell portion and the outer shell portion are independent separate structures, only the inner shell portion needs to be replaced, reducing replacement costs, simplifying replacement, and lowering the height requirements of the boiler casing.

Description

Technical Field

[0001] This invention relates to the field of electrode boiler technology, and more specifically to an electrode boiler wiring device. Background Technology

[0002] An electrode boiler typically includes a boiler shell, electrodes, and a wiring device. The wiring device consists of an insulating sleeve and a conductive rod inserted within the sleeve. One end of the conductive rod extends out of the boiler shell and connects to a high-voltage power source, while the other end extends into the boiler shell and connects to the electrodes. During operation, the electrodes are located inside the boiler shell and submerged in water. Utilizing the high thermal resistance of the boiler water, high-parameter, high-quality steam or hot water is produced. Because the boiler shell is a high-temperature, high-humidity, and high-pressure container, and the conductive rod carries high voltage, ensuring the safety of the electrode boiler requires guaranteeing the insulation of the wiring device, the sealing of the wiring device itself, and the sealing between the wiring device and the boiler shell.

[0003] In the prior art, electrode boiler wiring devices mostly use polytetrafluoroethylene (PTFE) sleeves and integral ceramic sleeves. The structure of an electrode boiler wiring device using PTFE sleeves is as disclosed in Chinese utility model patent document CN205911096U, which describes a high-voltage (10-35kV) electrode boiler high-voltage electrode lead insulating sleeve. This sleeve includes an outer sleeve and an inner sleeve arranged coaxially. One end of the outer sleeve and inner sleeve extends into the boiler and connects to the phase electrode, while the other end extends out of the electrode boiler. The inner sleeve contains a conductive rod (i.e., the electrode connecting rod in the aforementioned patent document) aligned with its direction. The inner sleeve is made of corundum, and the outer sleeve is made of PTFE. The outer sleeve is sealed to the boiler shell where it passes through. A single truncated cone is provided on the lower outer wall of the outer sleeve, and the outer sleeve is welded and sealed to the phase electrode through the single truncated cone.

[0004] The structure of the electrode boiler wiring device using an integral ceramic sleeve is as disclosed in the Chinese utility model patent document CN211177434U, which discloses an electrode-type hot water boiler. It includes a conductive rod (i.e., the electrode conductive rod mentioned in the document CN211177434U), and an integral insulating porcelain sleeve is fitted on the outside of the conductive rod. The insulating porcelain sleeve is connected to the boiler shell (i.e., the boiler drum mentioned in the document CN211177434U) through a porcelain sleeve mechanical seal device.

[0005] After the aforementioned electrode boiler wiring device is installed on the boiler shell, the portion of the sleeve extending into the boiler shell suffers severe corrosion due to the high temperature and humidity environment inside the boiler shell after prolonged operation. However, since both the aforementioned integral PTFE sleeve and ceramic sleeve are integral sleeves, the entire sleeve needs to be replaced, increasing replacement costs. Summary of the Invention

[0006] The purpose of this invention is to provide an electrode boiler wiring device to solve the technical problem that in existing electrode boiler wiring devices, replacing the entire bushing when part of the bushing extending into the boiler shell is damaged leads to increased costs.

[0007] To achieve the above objectives, the technical solution for the electrode boiler wiring device of the present invention is as follows:

[0008] An electrode boiler wiring device includes a sleeve passing through the boiler shell, with a conductive rod inserted inside the sleeve. The sleeve includes an inner shell portion and an outer shell portion located inside the boiler shell, arranged separately. The inner shell portion is a cylindrical structure, with a first sealing structure between the upper end of the inner shell portion and the lower end of the outer shell portion to seal the upper end of the inner shell portion. The conductive rod includes a conductive rod body and a mounting base, with the mounting base fixed to the lower end of the conductive rod body. A second sealing structure between the lower end of the inner shell portion and the mounting base to seal the lower end of the inner shell portion. A locking nut is provided at one end of the conductive rod body that extends upward through the sleeve, and the locking nut is threadedly connected to the conductive rod body to press against the outer shell portion.

[0009] The beneficial effects are as follows: In the electrode boiler wiring device of the present invention, the upper and lower ends of the inner shell part are in sealed contact with the outer shell part and the mounting base, respectively. When the locking nut locks the end of the conductive rod body extending out of the sleeve, the locking nut pulls the conductive rod body upward, causing the mounting base to support the inner shell part upward along the conductive rod body. This, in turn, seals the upper end of the inner shell part with the first sealing structure at the upper end and seals the lower end with the second sealing structure at the lower end, thus ensuring the sealing performance of the inner shell part itself. When the sleeve extending into the boiler shell, i.e., the inner shell part, is damaged or its performance deteriorates after prolonged use, since the inner shell part extending into the boiler shell and the outer shell part extending out of the boiler shell are independent separate structures, only the inner shell part needs to be replaced, reducing replacement costs and lowering the space height requirements of the boiler shell.

[0010] In a further improvement, at least one of the first and second sealing structures is a sealing gasket, and an elastic compensation element is fitted on the conductive rod body. The locking nut presses the outer part of the shell through the elastic compensation element.

[0011] The beneficial effects are as follows: With this design, when the conductive rod and the inner part of the shell expand due to heat, the elastic compensator can absorb the expansion of the conductive rod and the inner part of the shell, avoiding damage to the sleeve due to excessive material expansion. When the conductive rod and the inner part of the shell shrink due to cold, the elastic compensator releases the compression, so that the locking nut is always pressed tightly on the outer part of the shell, avoiding gaps at the end face and reduced sealing due to the difference in expansion between the conductive rod and the inner part of the shell.

[0012] As a further improvement, a thrust ball bearing is also fitted onto the conductive rod body, and the thrust ball bearing is located between the elastic compensation component and the locking nut.

[0013] The beneficial effect is that, with this design, the thrust ball bearing transmits the preload of the locking nut only along the axial direction to the elastic compensation component, so that the outer part of the housing only bears the axial force, thus avoiding the situation where the outer part of the housing bears the radial force and causes radial misalignment with the inner part of the housing, resulting in poor sealing.

[0014] Further improvements include the use of disc springs as the elastic compensation component.

[0015] The beneficial effect is that this design gives the disc spring assembly a certain rigidity, enabling it to withstand a greater nut preload to press the outer part of the housing.

[0016] As a further improvement, a gasket is also fitted on the conductive rod body, with the gasket located between the thrust ball bearing and the disc spring assembly.

[0017] The beneficial effect is that the contact surface between the gasket and the thrust ball bearing is larger, which makes it easier for the thrust ball bearing to evenly transmit the force to the disc spring assembly.

[0018] As a further improvement, the lower end of the conductive rod body is provided with a connecting flange, which is detachably connected to the mounting base by bolts.

[0019] The beneficial effects are: the mounting base is exposed to a high temperature and high humidity environment, while the conductive rod body is in a sealed environment and isolated from the high temperature and high humidity environment inside the boiler shell. After long-term operation, the mounting base will be damaged first, while the conductive rod body and the mounting base can be detachably connected, so only the mounting base can be replaced, saving replacement costs.

[0020] In a further improvement, the outer part of the shell includes a fixed flange and an upper sleeve. The fixed flange is located between the upper sleeve and the inner part of the shell. A third sealing structure is provided between the lower end of the fixed flange and the upper sleeve. The first sealing structure is provided between the fixed flange and the upper end of the inner part of the shell.

[0021] The benefits are: this design allows for separate processing of the fixed flange and the upper sleeve, facilitating the processing of the outer part of the shell and saving materials and costs.

[0022] In a further improvement, the upper sleeve includes an upper sleeve and a clamping seat. The clamping seat is pressed against the upper end face of the upper sleeve. A fourth sealing structure is provided between the clamping seat and the upper sleeve. The third sealing structure is provided between the fixed flange and the lower end of the upper sleeve.

[0023] The beneficial effect is that this design allows the upper sleeve and the clamping seat to be machined separately, which facilitates the machining of the upper sleeve.

[0024] Further improvements include a corrugated upper sleeve with a raised and recessed structure on its outer circumferential surface.

[0025] The beneficial effects are: the upper sleeve is exposed to the external environment, and the convex and concave structure on the outer circumference of the upper sleeve can increase the creepage distance and improve the safety of the upper sleeve.

[0026] Further improvements include the use of ceramic materials for the inner shell.

[0027] The beneficial effects are: this design results in higher insulation, heat resistance, and corrosion resistance for the ceramic inner shell, and a longer service life in high-temperature and high-humidity environments. Attached Figure Description

[0028] Figure 1 This is a diagram showing the electrode boiler wiring device of the present invention installed on the boiler shell;

[0029] Figure 2 This is a schematic diagram of the electrode boiler wiring device of the present invention;

[0030] Figure 3 for Figure 2 Enlarged view of part A in the image.

[0031] In the diagram: 11. Boiler shell; 12. Fixed flange seat; 13. Outer shell part; 14. Upper sleeve; 15. Inner shell part; 16. Electrode; 17. Conductive rod body; 18. Disc spring assembly; 19. Gasket; 20. Thrust ball bearing; 21. Locking nut; 22. Fixed flange; 23. First sealing structure; 24. Third sealing structure; 25. Pressing seat; 26. Fourth sealing structure; 27. Mounting seat; 28. Second sealing structure. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the process or method that includes said element.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the main body, or it can be separately arranged from the main body and connected to the main body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0037] The present invention will be further described in detail below with reference to embodiments.

[0038] Embodiment 1 of the electrode boiler wiring device of the present invention:

[0039] In this embodiment, as Figure 1 As shown, the electrode boiler wiring device is used to be installed on the boiler shell 11 to introduce 10kV electricity to the electrode 16 inside the boiler shell 11.

[0040] The electrode boiler wiring device includes a conductive rod, a sleeve, and a connecting assembly. The conductive rod is installed inside the sleeve, which passes through the boiler shell 11. One end of the conductive rod extending out of the boiler shell 11 is connected to a high-voltage power supply, and the other end of the conductive rod extending into the boiler shell 11 is connected to an electrode 16, so that the electrode 16 is connected to the high-voltage power supply. Thus, the water inside the boiler shell 11 can utilize its high thermal resistance characteristics to generate high-parameter, high-quality steam or hot water.

[0041] like Figures 1 to 3 As shown, the conductive rod includes a conductive rod body 17 and a mounting base 27. The lower end of the conductive rod body 17 is provided with a connecting flange, which is fixed to the mounting base 27 by bolts to realize the detachable connection between the conductive rod body 17 and the mounting base 27.

[0042] The sleeve includes an inner portion 15 extending into the boiler outer shell 11 and an outer portion 13 extending out of the boiler outer shell 11, with the inner portion 15 and the outer portion 13 arranged separately. The outer portion 13 includes an upper sleeve and a fixed flange 22. The upper sleeve includes an upper sleeve 14 and a clamping seat 25 pressed against the upper end face of the upper sleeve 14. Both the upper sleeve 14 and the inner portion 15 are cylindrical structures. The fixed flange 22 is located between the upper sleeve 14 and the inner portion 15. A first sealing structure 23 is provided between the upper end face of the inner portion 15 and the lower end face of the fixed flange 22, and a second sealing structure 28 is provided between the lower end face of the inner portion 15 and the mounting seat 27. A third sealing structure 24 is provided between the lower end face of the upper sleeve 14 and the upper end face of the fixed flange 22, and a fourth sealing structure 26 is provided between the clamping seat 25 and the upper end face of the upper sleeve 14, thus forming a sealed inner cavity of the sleeve to prevent steam inside the boiler outer shell 11 from leaking out through the gaps in the sleeve itself. In this embodiment, the first sealing structure 23, the second sealing structure 28, the third sealing structure 24, and the fourth sealing structure 26 are all sealing gaskets.

[0043] Both the upper sleeve 14 and the inner shell 15 are made of ceramic material. The inner shell 15 is a straight sleeve, and the upper sleeve 14 is a corrugated sleeve. The outer circumferential surface of the corrugated sleeve has a concave-convex structure to increase the creepage distance between the upper sleeve 14 and the external environment.

[0044] In use, the fixed flange 22 is connected and fixed to the fixed flange seat 12 on the boiler shell 11 to seal and fix the sleeve on the boiler shell 11.

[0045] The connecting assembly is sleeved and fixed to one end of the conductive rod body 17 that extends upward through the sleeve, and is pressed against the clamping seat 25 along the axial direction of the conductive rod body 17. The connecting assembly includes a locking nut 21, a thrust ball bearing 20, a washer 19, and a disc spring assembly 18 arranged sequentially from top to bottom. The locking nut 21 is threadedly connected to the conductive rod body 17 with a certain locking force. The locking nut 21 pulls the conductive rod upward, so that the mounting seat 27 supports the inner part of the shell 15 upward and presses against the second sealing structure 28. In turn, the inner part of the shell 15, which is subjected to the upward supporting force, presses against the first sealing structure 23. The thrust ball bearing 20 and the washer 19 are both located above the disc spring assembly 18, so that the preload of the locking nut 21 is evenly and quickly transmitted to the disc spring assembly 18, which in turn presses against the outer part of the shell 13 downward, so that the clamping seat 25 presses against the fourth sealing structure 26 and the upper sleeve 14 presses against the third sealing structure 24. In this embodiment, the gasket 19 is a steel plate ring, and the disc spring assembly 18 constitutes an elastic compensation component.

[0046] The sleeve and conductive rod are prone to thermal expansion under high temperature working environment. The disc spring assembly 18 can absorb the expansion of the sleeve and conductive rod due to thermal expansion and contraction, and avoid gaps at the sealing point caused by the different expansion amounts of the inner part 15, the outer part 13 and the conductive rod, which would lead to poor sealing.

[0047] In the electrode boiler wiring device of the present invention, when the sleeve extending into the boiler outer shell 11, i.e., the inner shell portion 15, is damaged or its performance deteriorates after long-term use, since the inner shell portion 15 extending into the boiler outer shell 11 and the outer shell portion 13 extending out of the boiler outer shell 11 are independent separate structures, only the inner shell portion 15 needs to be replaced, reducing replacement costs. At the same time, since only operating space for disassembling and assembling the inner shell portion 15 needs to be reserved within the boiler outer shell 11, the design height requirement for the boiler outer shell 11 is reduced. When replacing the inner shell portion 15, after removing the locking nut 21, move the conductive rod body 17 and the mounting base 27 downwards together, causing the inner shell portion 15 to move downwards until there is a certain distance between the upper end of the inner shell portion 15 and the boiler outer shell 11. Since the mounting base 27 and the inner shell portion 15 are not connected or fixed, loosen the bolts between the conductive rod body 17 and the mounting base 27, directly remove the damaged or degraded inner shell portion 15, place the new inner shell portion 15 on the mounting base 27, and reconnect the bolts between the conductive rod body 17 and the mounting base 27. Finally, return the conductive rod to its original position and tighten the locking nut 21. In this way, it is not necessary to remove the conductive rod during the replacement process, reducing the difficulty of replacement and lowering the height requirements of the boiler outer shell.

[0048] Embodiment 2 of the electrode boiler wiring device of the present invention:

[0049] The difference between this embodiment and Embodiment 1 is as follows: In Embodiment 1, a first sealing structure 23 is provided between the upper end face of the inner shell portion 15 and the fixed flange 22, and a second sealing structure 28 is provided between the lower end face of the inner shell portion 15 and the mounting base 27. Both the first sealing structure 23 and the second sealing structure 28 are sealing gaskets, and the locking nut 21 presses the outer shell portion 13 with an elastic compensating member. In this embodiment, the first sealing structure 23 is a sealing ring, the second sealing structure 28 is a sealing gasket, an installation groove is provided on the lower end face of the fixed flange 22, and a sealing groove is provided on the part of the inner shell portion 15 that is inserted into the installation groove, and the sealing ring is installed in the sealing groove. In other embodiments, both the first sealing structure 23 and the second sealing structure 28 are sealing rings, and installation grooves are provided on the lower end face of the flange and the mounting base 27. The upper and lower ends of the inner shell portion 15 are respectively inserted into the installation grooves, and sealing grooves are provided on the outer circumferential surface of the inserted part, and the sealing ring is installed in the corresponding sealing groove. It should be noted that the elastic compensating member can be omitted in this case.

[0050] Embodiment 3 of the electrode boiler wiring device of the present invention:

[0051] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the elastic compensating element is a disc spring assembly 18. In this embodiment, the elastic compensating element is a helical spring.

[0052] Embodiment 4 of the electrode boiler wiring device of the present invention:

[0053] The difference between this embodiment and Embodiment 1 is as follows: In Embodiment 1, the outer shell portion 13 includes a fixed flange 22 and an upper sleeve. The fixed flange 22 is located between the upper sleeve and the inner shell portion 15. A third sealing structure 24 is provided between the lower end of the fixed flange 22 and the upper sleeve, and a first sealing structure 23 is provided between the fixed flange 22 and the upper end of the inner shell portion 15. In this embodiment, the fixed flange 22 and the upper sleeve are an integral structure, in which case the third sealing structure 24 can be omitted.

[0054] Embodiment 5 of the electrode boiler wiring device of the present invention:

[0055] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the conductive rod body 17 and the mounting base 27 are detachably connected. In this embodiment, the conductive rod body 17 and the mounting base 27 are welded together. In other embodiments, the conductive rod body 17 and the mounting base 27 are integrally machined.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electrode boiler wiring device, characterized in that, Includes a sleeve for passing through the boiler shell (11), with a conductive rod inserted inside the sleeve. The sleeve includes an inner shell portion (15) located inside the boiler shell (11) during use and an outer shell portion (13) located inside the boiler shell (11) during use. The inner shell portion (15) and the outer shell portion (13) are arranged separately. The inner shell portion (15) has a cylindrical structure. The outer shell portion includes a fixed flange (22) and an upper sleeve. The fixed flange is located between the upper sleeve and the inner shell portion. A first sealing structure (23) is provided between the upper end of the inner shell portion (15) and the fixed flange to seal the upper end of the inner shell portion (15). The conductive rod includes a conductive rod body (17) and a mounting base (27). The mounting base (27) has a conductive rod body (17) and a mounting base (28). 7) The electrical connection is fixed at the lower end of the conductive rod body (17). A second sealing structure (28) is provided between the lower end of the inner shell part (15) and the mounting seat (27) to seal the lower end of the inner shell part (15). The upper sleeve includes an upper sleeve (14) and a clamping seat (25). The clamping seat is pressed on the upper end face of the upper sleeve. A locking nut (21) is provided at one end of the conductive rod body (17) that extends upward through the sleeve. The locking nut (21) is threadedly connected to the conductive rod body (17) to clamp the outer shell part (13) through the clamping seat. The fixed flange is provided with a through hole for the conductive rod body to pass through. An integral through insulating gap is formed between the upper sleeve, the through hole and the inner shell part and the conductive rod body.

2. The electrode boiler wiring device according to claim 1, characterized in that, At least one of the first sealing structure (23) and the second sealing structure (28) is a sealing gasket. An elastic compensation member is sleeved on the conductive rod body (17), and the locking nut (21) presses the outer part (13) of the shell through the elastic compensation member. A thrust ball bearing (20) is also sleeved on the conductive rod body (17), and the thrust ball bearing (20) is located between the elastic compensation member and the locking nut (21). The elastic compensation member is a disc spring assembly (18).

3. The electrode boiler wiring device according to claim 1, characterized in that, The bottom end of the upper sleeve (14) and the top end of the inner shell part (15) are respectively pressed against the upper and lower sides of the fixed flange (22) at the same position.

4. The electrode boiler wiring device according to claim 2, characterized in that, The upper sleeve (14), through hole, and inner wall of the shell inner part (15) are aligned vertically to form an insulating gap with the same overall shape.

5. The electrode boiler wiring device according to claim 4, characterized in that, A gasket (19) is also fitted on the conductive rod body (17), and the gasket (19) is located between the thrust ball bearing (20) and the disc spring assembly (18).

6. The electrode boiler wiring device according to any one of claims 1 to 5, characterized in that, The lower end of the conductive rod body (17) is provided with a connecting flange, which is detachably connected to the mounting base (27) by bolts.

7. The electrode boiler wiring device according to any one of claims 1 to 5, characterized in that, A third sealing structure (24) is provided between the fixed flange (22) and the lower end of the upper sleeve.

8. The electrode boiler wiring device according to claim 7, characterized in that, A fourth sealing structure (26) is provided between the clamping seat (25) and the upper sleeve, and the third sealing structure (24) is provided between the fixed flange (22) and the lower end of the upper sleeve (14).

9. The electrode boiler wiring device according to claim 8, characterized in that, The upper sleeve (14) is a corrugated sleeve, and the outer circumferential surface of the corrugated sleeve is provided with a convex and concave structure.

10. The electrode boiler wiring device according to any one of claims 1 to 5, characterized in that, The inner part of the shell (15) is made of ceramic material.

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