Self-cleaning device of large transformer cooler

Abstract

The invention relates to the technical field of transformer cooler cleaning, in particular to a self-cleaning device of a large transformer cooler, which comprises a lead screw and a cleaning assembly, the lead screw is vertically arranged between a cooler and a transformer, the bottom end of the lead screw is connected with a driving assembly, the upper and lower ends of the lead screw are connected with the cooler, and the cleaning assembly can move up and down along the lead screw. The cleaning assembly comprises an advancing nut and a supporting frame, the advancing nut is in threaded connection with the lead screw, one end of the supporting frame is fixedly connected with the advancing nut, the end, close to the cooler, of the supporting frame is connected with a water sprayer, and the water outlet end of the water sprayer faces the cooler; a limiting rail is arranged on the side, close to the transformer, of the cooler and axially parallel to the lead screw, and the supporting frame can move along the limiting rail. Through the collaborative design of all the structures, sundries on the cooler are effectively removed, heat dissipation efficiency reduction caused by dirt accumulation is avoided, the heat dissipation performance of the cooler can be guaranteed, the operation and maintenance cost can be reduced, and the equipment safety can be improved.

Description

Technical Field

[0001] This invention relates to the field of transformer cooler cleaning technology, and in particular to a self-cleaning device for large transformer coolers. Background Technology

[0002] Transformers, as commonly used electrical equipment, can switch voltage levels to adapt to different scenarios. However, they generate a large amount of heat during operation. If this heat cannot be dissipated in time, it can damage the coil insulation and even cause the equipment to burn out. Cooling methods mainly include natural cooling, air cooling, and oil cooling. Among these, forced oil circulation cooling is used in large high-voltage transformers due to its superior heat dissipation effect. This method achieves heat dissipation through an external cooler 16, which includes a cooling fan 20, heat dissipation pipes 22, and a submersible oil pump 21. During operation, the heat generated by the transformer bushings 19 raises the oil temperature. The high-temperature oil flows through the heat dissipation pipes 22 to dissipate heat, and the cooling fan 20 blows the heat to the atmosphere. The cooled oil is then pumped back to the bottom of the transformer by the submersible oil pump 21, forming a circulating cooling system. The flow direction of the transformer oil is as follows: Figure 1 As shown by the dashed line.

[0003] However, forced oil circulation coolers have the problem of being difficult to clean. The cooling pipes of the cooler are often covered with heat sinks. The heat sinks are designed to be dense to enhance heat dissipation. In addition, with the action of the cooling fan, debris in the air, especially poplar hair in spring, is easily attracted to them and clogs the gaps between the heat sinks, resulting in a decrease in cooling effect and an increase in oil temperature. When the oil temperature reaches the threshold, the transformer needs to be shut down, otherwise it is easily damaged. There are two main cleaning solutions: one is power outage water cleaning, which requires shutting down the transformer, affecting the company's profits and the user's power supply. Moreover, poplar fluff has a long lifespan and requires frequent power outages, making it impractical. The other is live water cleaning, which does not require power outages, but if the water jet accidentally touches the transformer bushing when the staff uses the water gun, it can easily cause electric shock accidents and may also cause the transformer protection to trip, posing a significant safety hazard. Summary of the Invention

[0004] The purpose of this invention is to provide a self-cleaning device for a large transformer cooler, which can solve the above-mentioned technical problems and can safely clean the cooler without power interruption.

[0005] This invention provides a self-cleaning device for a large transformer cooler, comprising a lead screw and a cleaning assembly. The lead screw is vertically arranged between the cooler and the transformer. The bottom end of the lead screw is connected to a drive assembly, and the upper and lower ends of the lead screw are connected to the cooler. The cleaning assembly can move up and down along the lead screw. The cleaning assembly includes a travel nut and a support frame. The travel nut is threadedly connected to the lead screw. One end of the support frame is fixedly connected to the travel nut. A water sprayer is connected to the end of the support frame near the cooler, and the water outlet of the water sprayer faces the cooler. The cooler is provided with a limiting rail on the side near the transformer. The limiting rail is parallel to the axis of the lead screw, and the support frame can be displaced along the limiting rail.

[0006] Preferably, the limiting track includes two C-shaped rails arranged opposite each other, and the front ends of the support frame are provided with wheels that can slide up and down along the rails.

[0007] Preferably, a limiting component is provided between the limiting track and the support frame, and a limiting piece is provided on the support frame corresponding to the limiting component. When the support frame moves close to the limiting component, the limiting piece contacts the limiting component.

[0008] Preferably, the limiting component includes an upward limiting switch located at the top of the limiting track and a downward limiting switch located at the bottom of the limiting track.

[0009] Preferably, the top end of the lead screw is connected to the top of the cooler via an upper bracket, the bottom end of the lead screw is connected to the bottom of the cooler via a lower bracket, the top end of the lead screw and the upper bracket are connected by a bearing, the drive assembly is a commutator motor, the bottom end of the lead screw is connected to the output end of the commutator motor, and the commutator motor is fixedly connected to the lower bracket.

[0010] Preferably, the water sprayer includes a main water pipe, which is fixedly connected to the support frame. The main water pipe is horizontally arranged, and a plurality of nozzles are provided on the side of the main water pipe near the cooler. The side of the main water pipe away from the cooler is connected to a water inlet connector, which is connected to an external water source through the water inlet pipe.

[0011] Preferably, the nozzle is a rotatable high-pressure nozzle.

[0012] Preferably, a water pump is installed on the water inlet pipe.

[0013] Preferably, a water pressure sensor is provided on the water inlet pipe.

[0014] Preferably, a control box is provided at the bottom of the cooler, and a controller is provided inside the control box. The controller is connected to the drive assembly through a control loop.

[0015] Beneficial effects: This invention achieves efficient, stable, and automated cleaning of the cooler through the coordinated design of various structures, effectively removing debris from the cooler and avoiding a decrease in heat dissipation efficiency due to dirt accumulation. It can not only ensure the heat dissipation performance of the cooler, but also reduce operation and maintenance costs and improve equipment safety.

[0016] In this invention, the cooperation between the lead screw and the commutator motor provides stable vertical power for the cleaning component; the forward and reverse rotation control of the commutator motor can drive the cleaning component to reciprocate, covering the entire height of the cooler; the limiting track adopts two opposing C-shaped tracks, which, together with the wheels at both ends of the support frame, reduce the running resistance through rolling friction and limit the lateral sway of the support frame, ensuring a stable distance between the sprayer and the cooler, and avoiding collisions or uneven rinsing force. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the existing technology structure; Figure 2 This is a schematic diagram showing the structural breakdown of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the control loop in Embodiment 1 of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1-Traverse rail, 2-Support frame, 3-Screw screw, 4-Traverse nut, 5-Bearing, 6-Main water pipe, 7-Nozzle, 8-Water inlet connector, 9-Traverse wheel, 10-Limit plate, 11-Commutator motor, 12-Upper bracket, 13-Upper limit switch, 14-Lower limit switch, 15-Transformer, 16-Cooler, 17-Lower bracket, 18-Control box, 19-Transformer bushing, 20-Cooling fan, 21-Submersible oil pump, 22-Heat pipe; ZK - Air switch, SC - Upward contactor, XC - Downward contactor, SW - Upward limit switch, XW - Downward limit switch, SA - Upward push button, XA - Downward push button, RJ - Thermal relay. Detailed Implementation

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

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Example 1 like Figures 2-3 As shown, a self-cleaning device for a large transformer cooler includes a lead screw 3 and a cleaning assembly. The lead screw 3 is vertically positioned between the cooler 16 and the transformer 15. The bottom end of the lead screw 3 is connected to a drive assembly. Both ends of the lead screw 3 are connected to the cooler 16. The top end of the lead screw 3 is connected to the top of the cooler 16 via an upper bracket 12, and the bottom end of the lead screw 3 is connected to the bottom of the cooler 16 via a lower bracket 17. A bearing 5 connects the top end of the lead screw 3 to the upper bracket 12, allowing for free rotation while achieving radial limiting. The outer wall of the bearing 5 is fixedly connected to the upper bracket 12. The drive assembly uses a commutator motor 11. The bottom end of the lead screw 3 is connected to the output end of the commutator motor 11, and the commutator motor 11 is fixedly connected to the lower bracket 17. The commutator motor 11 has a waterproof housing to prevent water damage to the internal circuitry. The commutator motor 11 has a commutator at the front end, which is connected to the lead screw 3. The commutator can adjust the output direction and output speed of the commutator motor 11, thereby changing the operating speed of the water sprayer.

[0024] The cleaning component can move up and down along the lead screw 3. The cleaning component includes a traveling nut 4 and a support frame 2. The traveling nut 4 is threadedly connected to the lead screw 3, and one end of the support frame 2 is fixedly connected to the traveling nut 4. A limiting rail is provided on the side of the cooler 16 near the transformer 15. The limiting rail is parallel to the axis of the lead screw 3, and the support frame 2 can move along the limiting rail. The limiting rail includes two opposing C-shaped rails 1, which are located on both sides of the cooler 16. The front ends of the support frame 2 are provided with traveling wheels 9, which are located in the grooves of the traveling rails 1 and can slide up and down along the traveling rails 1. The traveling rails 1 can limit the running trajectory of the traveling wheels 9, while ensuring that the traveling nut 4 can move along the lead screw 3. The commutator motor 11 can control the forward and reverse rotation of the lead screw 3. The commutator motor 11 can precisely control the forward and reverse rotation, and in conjunction with the threaded transmission between the lead screw 3 and the traveling nut 4, converts the rotational motion into the up and down linear displacement of the cleaning component, realizing reciprocating cycle and ensuring that the cleaning range of the cleaning component covers the entire height of the cooler 16.

[0025] A limiting assembly is provided between the limiting track and the support frame 2. The limiting assembly includes an upward limiting switch 13 located at the top of the track 9 and a downward limiting switch 14 located at the bottom of the track 9. Both the upward limiting switch 13 and the downward limiting switch 14 are waterproof. A limiting plate 10 is provided on the side of the support frame 2 corresponding to the limiting assembly. When the support frame 2 moves close to the limiting assembly, the limiting plate 10 contacts the limiting assembly, triggering the upward limiting switch 13 or the downward limiting switch 14. Then, the controller controls the commutator motor 11 to stop rotating through the control loop to prevent the cleaning component from overtraveling and impacting the support frame 2 or the cooler 16, thus protecting the mechanical structure. Afterward, the controller can control the commutator motor 11 to reverse through the control loop to achieve repeated cleaning until it is clean.

[0026] A water sprayer is connected to one end of the support frame 2 near the cooler 16, with the water outlet of the sprayer facing the cooler 16. The water sprayer includes a main water pipe 6, which is fixedly connected to the top of the support frame 2. The main water pipe 6 is horizontally positioned, and several nozzles 7 are provided on the side of the main water pipe 6 near the cooler 16. The nozzles 7 are rotatable high-pressure nozzles. The spray range of the nozzles 7 covers the lateral width of the cooler 16, ensuring thorough cleaning without any blind spots.

[0027] The main water pipe 6 is connected to the inlet connector 8 on the side furthest from the cooler 16. The inlet connector 8 is connected to an external water source via an inlet pipe. The inlet pipe is equipped with a water pump and a water pressure sensor. The water pump adjusts the water pressure within the inlet pipe to flush away debris from the heat sink fins of the cooler 16. A high-pressure hose is used for the inlet pipe to prevent excessive stress and damage during flushing. A quick-connect fitting can be used between the inlet pipe and the inlet connector 8 for rapid installation and disassembly. Fire-fighting water can be used as the water source. During flushing, the cooling fan 20 must be turned on to quickly disperse the flushed debris and dirty water into the atmosphere, preventing it from settling at the bottom of the cooler 16 and affecting the insulation of the cooling fan 20 motor.

[0028] A control box 18 is located at the bottom of the cooler 16. The control box 18 contains a controller, which is connected to the commutator motor 11 via a control circuit to control its commutation rotation. The control circuit is as follows: Figure 4 As shown, it includes an upward circuit and a downward circuit for the water sprayer. During the upward movement of the support frame 2, the upward circuit is connected and the upward contactor SC is working. During the downward movement of the support frame 2, the downward circuit is connected and the downward contactor XC is working.

[0029] The working principle of the control loop is as follows: Upward movement: After the water sprayer is filled with water, press the upward button SA. The commutator motor 11 drives the lead screw 3 to rotate, and the travel nut 4 drives the water sprayer to move upward. When the limit plate on the support frame 2 touches the upward limit switch SW, the limit switch cuts off the upward circuit of the water sprayer, and the water sprayer stops running.

[0030] Downward movement: After the water sprayer is filled with water, press the downward movement button XA. The commutator motor 11 drives the lead screw 3 to rotate, and the travel nut 4 drives the water sprayer to move downward. When the limit plate on the support frame 2 touches the downward movement limit switch XW, the limit switch cuts off the downward movement circuit of the water sprayer, and the water sprayer stops running.

[0031] Stop: If the water sprayer needs to stop at any position, simply press the stop button TA to shut off the commutator motor 11.

[0032] The control circuit includes a self-holding circuit. Operators only need to press the start button to leave; the water sprayer will operate between the upper limit switch SW and the lower limit switch XW, driven by the travel nut 4, reducing maintenance labor costs. This circuit also features an electrical interlock to prevent simultaneous operation of the upper and lower circuits, thus avoiding equipment damage. Additionally, a thermal relay RJ is included in the circuit to cut off power in case of mechanical jamming, preventing the commutator motor 11 from burning out due to overload.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-cleaning device for a large transformer cooler, characterized in that, The device includes a lead screw and a cleaning assembly. The lead screw is vertically positioned between the cooler and the transformer. The bottom end of the lead screw is connected to a drive assembly, and the upper and lower ends of the lead screw are connected to the cooler. The cleaning assembly can move up and down along the lead screw. The cleaning assembly includes a travel nut and a support frame. The travel nut is threadedly connected to the lead screw. One end of the support frame is fixedly connected to the travel nut. A water sprayer is connected to the end of the support frame near the cooler, and the water outlet of the water sprayer faces the cooler. The cooler is provided with a limiting rail on the side near the transformer. The limiting rail is parallel to the axis of the lead screw, and the support frame can be displaced along the limiting rail.

2. The self-cleaning device for a large transformer cooler according to claim 1, characterized in that, The limiting track includes two C-shaped rails arranged opposite each other, and the front ends of the support frame are provided with wheels that can slide up and down along the rails.

3. The self-cleaning device for a large transformer cooler according to claim 2, characterized in that, A limiting component is provided between the limiting track and the support frame. The support frame is provided with a limiting piece corresponding to the limiting component. When the support frame moves close to the limiting component, the limiting piece contacts the limiting component.

4. The self-cleaning device for a large transformer cooler according to claim 3, characterized in that, The limiting component includes an upward limiting switch located at the top of the limiting track and a downward limiting switch located at the bottom of the limiting track.

5. The self-cleaning device for a large transformer cooler according to claim 1, characterized in that, The top end of the lead screw is connected to the top of the cooler via an upper bracket, and the bottom end of the lead screw is connected to the bottom of the cooler via a lower bracket. The top end of the lead screw and the upper bracket are connected by a bearing. The drive assembly is a commutator motor. The bottom end of the lead screw is connected to the output end of the commutator motor, and the commutator motor is fixedly connected to the lower bracket.

6. The self-cleaning device for a large transformer cooler according to claim 1, characterized in that, The water sprayer includes a main water pipe, which is fixedly connected to the support frame. The main water pipe is horizontally arranged, and several nozzles are provided on the side of the main water pipe near the cooler. The side of the main water pipe away from the cooler is connected to a water inlet connector, which is connected to an external water source through the water inlet pipe.

7. The self-cleaning device for a large transformer cooler according to claim 6, characterized in that, The nozzle is a rotatable high-pressure nozzle.

8. The self-cleaning device for a large transformer cooler according to claim 6, characterized in that, A water pump is installed on the water inlet pipe.

9. The self-cleaning device for a large transformer cooler according to claim 6, characterized in that, A water pressure sensor is installed on the water inlet pipe.

10. The self-cleaning device for a large transformer cooler according to claim 1, characterized in that, The cooler has a control box at the bottom, and a controller is installed inside the control box. The controller is connected to the drive assembly through a control loop.

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