Self-cleaning electrode heater

Abstract

The utility model discloses a self -cleaning electrode heater belongs to heating equipment technical field, including heating jar body, and the center electrode column and spiral heating pole of setting in jar body, still fixedly arranged with electrode cleaning pipe in the heating jar body, is set up with the water spray hole of facing center electrode column and spiral heating pole on electrode cleaning pipe, the outside of heating jar body still is connected with centrifugal fan, and the air outlet pipeline of centrifugal fan is linked together with heating jar body inner chamber. The utility model discloses a setting electrode cleaning pipe can be on -line spray flushing to heating electrode under the condition of not disassembling equipment, and utilize centrifugal fan to strengthen the convection heat exchange of heating stage and the drying of cleaning after purging, effectively solved the existing electrode heater scale after cleaning difficult, the problem of complicated maintenance, has the beneficial effect of high structure integration, convenient maintenance and can long -term keep efficient operation.

Description

Technical Field

[0001] This utility model relates to the field of heating equipment technology, and in particular to a self-cleaning electrode heater. Background Technology

[0002] Electrode heaters, as highly efficient electrical energy to heat energy conversion devices, are widely used in various industrial fields such as chemical, food, and pharmaceutical industries for heating liquid or gaseous media. Their principle involves placing electrodes directly or indirectly in the medium being heated, and then applying electricity to cause the electrodes to heat up, thereby achieving rapid and precise temperature control heating.

[0003] However, during long-term operation, especially when handling media containing impurities or prone to crystallization, a layer of scale, coke, or other deposits inevitably accumulates on the surface of the heating electrodes. This layer of dirt has extremely low thermal conductivity, forming a significant thermal barrier. On the one hand, this leads to a substantial decrease in heat transfer efficiency, requiring more electrical energy to achieve the same heating effect; on the other hand, the heat accumulated inside the electrode cannot be effectively dissipated, which may cause localized overheating and burnout of the electrode, seriously affecting the service life of the equipment and production safety.

[0004] To restore heating performance, existing technologies typically employ periodic shutdowns. After the equipment cools down, the heater tank is manually disassembled for maintenance operations such as mechanical scraping and chemical cleaning of the electrodes. This traditional offline cleaning method has significant drawbacks: it not only requires production interruption, resulting in lengthy downtime, but the entire cleaning process is also time-consuming, labor-intensive, and carries the risk of secondary damage to the electrodes during disassembly and scraping. Therefore, existing electrode heaters generally lack an integrated structure capable of rapid maintenance without interrupting the operation of the main equipment.

[0005] Therefore, this invention proposes a self-cleaning electrode heater to address the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a self-cleaning electrode heater, which aims to improve the problem that the existing electrode heaters lack an integrated online cleaning structure, resulting in difficulty in maintenance and low heating efficiency after electrode scaling.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a self-cleaning electrode heater, comprising: a heating tank, the top of which is detachably connected to a top cover, and the bottom of which is fixedly connected to a lower base; an electrode base, which is fixedly connected to the upper surface of the lower base; a central electrode column, the lower end of which is vertically fixedly connected to the electrode base; and a spiral heating electrode, which is coaxially wrapped around the outer periphery of the central electrode column, and the lower end of which is fixedly connected to the electrode base; and also includes an electrode cleaning tube and a centrifugal fan. The electrode cleaning tube is supported by the lower base of the tank and fixed inside the heating tank. The electrode cleaning tube has multiple water spray holes facing the central electrode post and the spiral heating electrode. The air outlet pipe of the centrifugal fan is connected to the side wall of the heating tank.

[0008] Preferably, the centrifugal fan includes a mounting base, a driver is mounted on the mounting base, the output end of the driver is connected to a rotating shaft, and a fan impeller is fixedly connected to the end of the rotating shaft away from the driver.

[0009] Preferably, the centrifugal fan further includes an air inlet flange, which is disposed on the coaxial line of the fan impeller.

[0010] Preferably, the electrode cleaning tube includes a liquid supply tube, a spiral liquid inlet hose connected to the liquid supply tube, and a water inlet tube connected to the spiral liquid inlet hose, wherein the water spray hole is formed on the wall of the water inlet tube.

[0011] Preferably, the spiral inlet hose and the water inlet pipe are fastened together by a lock nut threaded fastening.

[0012] Preferably, the lower base of the tank is also connected to an outlet pipe for discharging waste liquid.

[0013] Preferably, an electrode positioning tube is fixedly connected to the upper surface of the electrode base, and the central electrode post passes through the inside of the electrode positioning tube.

[0014] Preferably, the upper cover has a hot air outlet for discharging hot air.

[0015] Preferably, an insulating plate is stacked between the electrode base and the lower end of the central electrode post.

[0016] This utility model has the following beneficial effects: 1. This utility model solves the problem in the prior art that the electrode must be disassembled and manually cleaned after scaling, which leads to complicated maintenance process, long time and high labor intensity. It achieves the technical effect of online cleaning of electrodes without disassembly, simplifying the maintenance process and significantly shortening equipment downtime.

[0017] 2. This utility model solves the problems of low heat exchange efficiency and uneven temperature caused by natural convection alone in the existing technology, as well as the difficulty in drying residual liquid on the electrode surface after wet cleaning, by adding a centrifugal fan and connecting the fan's air outlet pipe to the inside of the heating tank. It achieves the dual technical effects of enhancing convection heat exchange to improve heating efficiency and uniformity during heating, and assisting in blowing and drying the electrode surface after cleaning. Attached Figure Description

[0018] Figure 1 This is a perspective view of the self-cleaning electrode heater proposed in this utility model; Figure 2 This is a schematic diagram of the electrode cleaning tube of the self-cleaning electrode heater proposed in this utility model. Figure 3 This is a schematic diagram of the hot gas exhaust port of the self-cleaning electrode heater proposed in this utility model. Figure 4 This is a schematic diagram of the spiral liquid inlet hose of the self-cleaning electrode heater proposed in this utility model. Figure 5 This is a schematic diagram of the centrifugal fan for the self-cleaning electrode heater proposed in this utility model.

[0019] Legend: 1. Heating tank; 101. Top cover; 102. Hot air outlet; 103. Insulation plate; 104. Spiral heating electrode; 105. Central electrode column; 106. Electrode base; 107. Electrode positioning tube; 2. Electrode cleaning tube; 201. Spiral liquid inlet hose; 202. Water inlet pipe; 203. Water spray hole; 204. Locking nut; 205. Liquid outlet pipe; 206. Liquid supply pipe; 207. Lower base of tank; 3. Centrifugal fan; 301. Air inlet flange; 302. Fan impeller; 303. Shaft; 304. Driver; 305. Air outlet duct; 306. Mounting base. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Reference Figures 1-5This utility model provides an embodiment of a self-cleaning electrode heater, comprising a heating tank 1 serving as an integral mounting and support platform, an electrode heating assembly, an electrode cleaning pipe 2 integrated inside the heating tank 1, and a centrifugal fan 3 linked to the outside of the heating tank 1. The main body of the heating tank 1 is a hollow cylindrical structure, with a top cover 101 detachably connected to its top via flange bolts, and a lower base 207 fixedly connected to its bottom via welding. The top cover 101 and the lower base 207 together seal the internal space of the heating tank 1. The electrode heating assembly generates heat, the electrode cleaning pipe 2 performs online rinsing of the electrode heating assembly, and the centrifugal fan 3 regulates the airflow inside the heating tank 1 to enhance the heating and cleaning process. The electrode heating assembly specifically includes an electrode base 106 fixedly connected to the upper surface of the lower base 207, and electrodes mounted on the electrode... The base 106 has a central electrode post 105 and a spiral heating electrode 104. The lower end of the central electrode post 105 is vertically fixed to the center of the electrode base 106, while the spiral heating electrode 104 is coaxially wrapped around the outer periphery of the central electrode post 105. The lower end of the spiral heating electrode 104 is also fixedly connected to the electrode base 106. When the central electrode post 105 and the spiral heating electrode 104 are energized, they work together as a heat source. The electrode cleaning tube 2 is supported by the lower base 207 of the tank and is fixedly installed inside the heating tank 1. The electrode cleaning tube 2 has multiple water spray holes 203. The spray axis of all water spray holes 203 is set to face the surface of the central electrode post 105 and the spiral heating electrode 104, so as to ensure that the cleaning liquid can accurately cover the heating electrode. The centrifugal fan 3 is connected to the side wall of the heating tank 1 through its air outlet duct 305, and is used to force the external airflow into the internal space of the heating tank 1. The overall structure of the electrode cleaning tube 2 includes a liquid supply pipe 206, which serves as the main liquid inlet channel. One end of the pipe is adapted to connect to an external cleaning liquid source, and the other end is connected to a water inlet pipe 202 via a spiral liquid inlet hose 201. The spiral liquid inlet hose 201 has good flexibility, which facilitates layout and installation within the limited tank space. The water inlet pipe 202 is a rigid pipe arranged in a ring or multi-branch layout around the central electrode post 105. The aforementioned spray holes 203 are densely opened on its pipe wall. The connection between the spiral liquid inlet hose 201 and the water inlet pipe 202 is fastened by a locking nut 204 to ensure the sealing reliability during high-pressure liquid transportation. The electrode cleaning tube 2 is fixedly installed on the upper surface of the tank base 207 through its bottom support structure. Its function is to accurately, evenly and powerfully spray the cleaning liquid onto the surface of the spiral heating electrode 104 and the central electrode post 105 when the cleaning program is started, so as to effectively flush and peel off the electrode deposits. The centrifugal fan 3 specifically includes a mounting base 306 for stable installation, a driver 304 mounted on the mounting base 306, and a rotating assembly driven by the driver 304. The rotating assembly includes a rotating shaft 303 fixedly connected to the output end of the driver 304 and a fan impeller 302 fixed at the end of the rotating shaft 303. The centrifugal fan 3 also has an air inlet flange 301, which is set on the coaxial line of the fan impeller 302 to guide external airflow in. Driven by the driver 304, the fan impeller 302 rotates at high speed, pressurizing the gas drawn in through the air inlet flange 301 and forcibly sending it into the heating tank 1 through the air outlet pipe 305. This forced convection structure can significantly improve heat exchange efficiency during the heating stage, making the temperature inside the tank more uniform. During the cleaning stage, it can assist in purging and drying the electrodes, ensuring the efficient operation of the heating and cleaning processes. In order to achieve orderly discharge of waste liquid, a drainage channel is opened on the lower base 207 of the tank and connected to an outlet pipe 205. The outlet pipe 205 extends downward through the lower base 207 of the tank and is used to centrally discharge the waste liquid containing dirt generated after cleaning the electrodes to an external treatment system. To ensure the accuracy and stability of the installation of the central electrode post 105, a tubular electrode positioning tube 107 is fixedly connected to the upper surface of the electrode base 106, close to the lower end of the central electrode post 105. The lower part of the central electrode post 105 passes through the interior of the electrode positioning tube 107. The radial support of the inner wall of the electrode positioning tube 107 effectively prevents the central electrode post 105 from shifting when subjected to external force or thermal deformation. In order to facilitate the centralized export and subsequent use of hot gas, a hot gas outlet 102 is provided at the top center or a designated position of the top cover 101, and the high-temperature gas generated inside the heating tank 1 is transported out through the hot gas outlet 102. To ensure the electrical safety of the equipment, an insulating plate 103 made of high-temperature resistant insulating ceramic material is stacked between the lower end of the electrode base 106 and the central electrode post 105, and between the lower end of the electrode base 106 and the spiral heating electrode 104. The insulating plate 103 can effectively prevent current leakage to the lower base 207 of the tank and the heating tank 1, thereby avoiding the occurrence of safety accidents.

[0022] Working principle: When performing the heating task, the external power supply is turned on, and the current passes through the central electrode post 105 and the spiral heating electrode 104 respectively. The two electrodes heat up rapidly due to their own resistance, efficiently converting electrical energy into heat energy to heat the gas or material inside the tank 1. The generated high-temperature hot air is discharged through the hot air outlet 102 on the top cover 101. During this process, the centrifugal fan 3 can be started simultaneously. The driver 304 drives the fan impeller 302 to rotate, drawing in external air from the air inlet flange 301 and blowing it into the heating tank 1 through the air outlet pipe 305. The forced airflow formed can accelerate the heat exchange inside the tank, making the heating more uniform and rapid. Throughout the process, the insulation plate 103 always provides reliable electrical insulation protection. When the electrodes need to be cleaned, the heater stops heating and the cleaning program is started. The external cleaning fluid is delivered to the electrode cleaning tube 2 through the supply pipe 206, the spiral inlet hose 201 and the inlet pipe 202. Under the pressure of the external liquid pump, the cleaning fluid is sprayed out in a high-pressure jet from multiple spray holes 203 on the inlet pipe 202, which thoroughly washes the surface of the central electrode column 105 and the spiral heating electrode 104. The dirt attached to the electrodes is peeled off and dissolved under the mechanical impact of the water flow. The waste liquid generated by cleaning is mixed with the dirt and flows to the bottom of the tank under the action of gravity, and is discharged through the outlet pipe 205 on the bottom base 207 of the tank. At the same time or after the spray cleaning, the centrifugal fan 3 can be restarted. The airflow helps to blow away the residual droplets and accelerate the drying of the electrode surface, preparing for the next high-efficiency heating.

Claims

1. A self-cleaning electrode heater, comprising: Heating tank (1), the top of the heating tank (1) is detachably connected to a top cover (101), and the bottom of the tank is fixedly connected to a lower base (207). The electrode base (106) is fixedly connected to the upper surface of the lower base (207) of the tank; The lower end of the central electrode post (105) is vertically fixed to the electrode base (106). A spiral heating electrode (104) is coaxially surrounding the outer periphery of the central electrode post (105), and its lower end is fixedly connected to the electrode base (106). The electrode is characterized by further comprising: Electrode cleaning tube (2), the electrode cleaning tube (2) is supported by the lower base (207) of the tank body and fixedly installed inside the heating tank (1), and the electrode cleaning tube (2) is provided with a plurality of water spray holes (203) facing the central electrode column (105) and the spiral heating electrode (104). Centrifugal fan (3), the air outlet pipe (305) of the centrifugal fan (3) is connected to the side wall of the heating tank (1).

2. The self-cleaning electrode heater according to claim 1, characterized in that: The centrifugal fan (3) includes a mounting base (306), on which a driver (304) is mounted. The output end of the driver (304) is connected to a rotating shaft (303), and a fan impeller (302) is fixedly connected to one end of the rotating shaft (303) away from the driver (304).

3. The self-cleaning electrode heater according to claim 2, characterized in that: The centrifugal fan (3) also includes an air inlet flange (301), which is located on the same axis as the fan impeller (302).

4. The self-cleaning electrode heater according to claim 1, characterized in that: The electrode cleaning tube (2) includes a liquid supply tube (206), a spiral liquid inlet hose (201) connected to the liquid supply tube (206), and a water inlet tube (202) connected to the spiral liquid inlet hose (201). The water spray hole (203) is opened on the tube wall of the water inlet tube (202).

5. The self-cleaning electrode heater according to claim 4, characterized in that: The spiral liquid inlet hose (201) and the water inlet pipe (202) are connected by a locking nut (204) threaded fastening.

6. The self-cleaning electrode heater according to claim 1, characterized in that: The lower base (207) of the tank is also connected to an outlet pipe (205) for discharging waste liquid.

7. The self-cleaning electrode heater according to claim 1, characterized in that: An electrode positioning tube (107) is fixedly connected to the upper surface of the electrode base (106), and the central electrode post (105) passes through the inside of the electrode positioning tube (107).

8. The self-cleaning electrode heater according to claim 1, characterized in that: The upper cover (101) has a hot air outlet (102) for discharging hot air.

9. The self-cleaning electrode heater according to claim 1, characterized in that: An insulating plate (103) is stacked between the lower end of the electrode base (106) and the central electrode post (105).

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