Transformer vacuum drying treatment equipment with wave heating function
By introducing a wave heating system into the vacuum drying equipment, which utilizes a wave heating system composed of microwave, terahertz, far-infrared, and infrared heating tubes, the problem of low heat transfer efficiency in vacuum drying equipment is solved, achieving a highly efficient insulating drying effect and reducing costs and time.
Patent Information
- Application Number
- CN202422811000.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-18
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-11-18
AI Technical Summary
Existing vacuum drying equipment has poor heat conduction and radiation under vacuum conditions, resulting in low heat transfer efficiency and difficulty in effectively transferring heat to the transformer in the high vacuum stage, which affects the drying quality.
The transformer vacuum drying equipment with wave heating is adopted. The wave heating system, composed of microwave, terahertz, far-infrared and infrared heating tubes, combined with intelligent control equipment, realizes the simultaneous heat transfer and mass transfer. The water molecules are accelerated to detach under high vacuum by heating in different frequency bands.
Simultaneous heat and mass transfer is achieved under vacuum conditions, which improves the quality of insulation drying, shortens drying time, and reduces operating costs.
Smart Images
Figure CN223769161U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of transformer drying equipment, specifically a transformer vacuum drying equipment with wave heating. Background Technology
[0002] Transformer insulation drying is an indispensable process in transformer production. There are various heating methods for drying, making it a major energy consumer for transformer factories.
[0003] Existing vacuum drying equipment is a typical "heat-vacuum" device. That is, the object to be dried must be "heated first" and then "vacuumed". The transformer is placed in the middle of the vacuum tank, and the heating pipes are installed on (up to) 6 walls inside the vacuum tank. The heat can only be transferred from the heating pipes to the transformer through the air inside the tank as a heat transfer medium. The heat conduction and heat radiation are both very poor.
[0004] In a vacuum, heat transfer is even worse, especially after the vacuum is started. The air inside the tank is thin, making it impossible to efficiently transfer heat from the ferrous metal pipes to the transformer.
[0005] During the vacuum stage, heat cannot be replenished in time. Due to the high vacuum stage, the pressure reaches tens of Pascals, eventually down to a few Pascals. The air is extremely thin, making heat transfer from the pipes to the transformer almost impossible because there is no air convection heat transfer. The radiation effect of the pipes is also very poor. Extracting water molecules from the capillaries of the insulating material through vacuuming requires a certain amount of energy to overcome the van der Waals forces adhering to the solid surface of the capillaries; that is, a certain amount of heat must be supplied to the insulating material. If this energy cannot be replenished in time, the final moisture content will inevitably be high, resulting in poor drying quality. Utility Model Content
[0006] To address the shortcomings of existing technologies, this invention provides a transformer vacuum drying equipment with wave heating, which solves the technical problems mentioned in the background section.
[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a transformer vacuum drying equipment with wave heating, comprising a vacuum tank, characterized in that a pipe heating drying device is installed inside the vacuum tank, a plurality of reflectors are installed inside the vacuum tank, a wave heating pipe frame without a bottom plate is installed in the heating pipe space of the pipe heating drying device without an air duct plate, wave heating pipes are installed on the wave heating pipe frame, wave heating plates are installed on the top and side wall air duct plates of the pipe heating drying device, and an intelligent control device is provided outside the vacuum tank.
[0008] Preferably, the wave heating plate is electrically connected to the intelligent control device.
[0009] Preferably, the wave heating plate is composed of wave heating tubes that provide different frequencies (wavelengths).
[0010] Preferably, the wave heating tube is characterized by comprising a microwave heating tube, a terahertz heating tube, a far-infrared heating tube, and an infrared heating tube.
[0011] Beneficial effects
[0012] This utility model provides a transformer vacuum drying equipment with wave heating, which has the following beneficial effects: Under vacuum conditions, the device uses full-band radiation heating to achieve simultaneous heat and mass transfer. Under high vacuum conditions, the transformer insulation continues to receive heat, allowing water molecules to break free from the "van der Waals" binding and be discharged from the solid insulation more quickly and thoroughly, resulting in higher insulation drying quality. It realizes the physical process of "simultaneous mass and heat transfer" and the process control of "large-scale water discharge at low temperature" shortens the drying time, ensures product drying quality, and reduces the operating cost of the drying process. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of the transformer vacuum drying equipment with wave heating described in this utility model. Detailed Implementation
[0014] 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.
[0015] Combined with appendix Figure 1 This utility model provides a technical solution for a transformer vacuum drying equipment with wave heating: the transformer vacuum drying equipment with wave heating includes a vacuum tank, characterized in that a pipe heating drying device is installed inside the vacuum tank, several reflectors are installed inside the vacuum tank, a wave heating pipe frame without a bottom plate is installed in the heating pipe space of the pipe heating drying device without an air duct plate, wave heating pipes are installed on the wave heating pipe frame, wave heating plates are installed on the top and side wall air duct plates of the pipe heating drying device, and an intelligent control device is set outside the vacuum tank.
[0016] Furthermore, the wave heating plate is electrically connected to the intelligent control equipment, and through electronic control and AI software control, "mass transfer" and "heat transfer" can be carried out simultaneously.
[0017] Furthermore, the wave heating plate is composed of wave heating tubes that provide different frequencies (wavelengths).
[0018] Furthermore, the feature is that the wave heating tube includes a microwave heating tube, a terahertz heating tube, a far-infrared heating tube, and an infrared heating tube.
[0019] Example: In the initial stage of heating, the natural frequency of water molecules is 4.5 GHz, so this band is the best choice for microwave heating tubes to directly heat water molecules. Directly heating water molecules at around 50°C in the initial stage of heating is the most suitable option.
[0020] The pipes heat the transformer to 30-50℃, then a vacuum is created. To further increase the temperature, microwave radiation heating is used, meaning mass transfer and heat transfer occur simultaneously. This enables the process of producing large quantities of water from a low temperature.
[0021] The transition from low vacuum to high vacuum involves overheating via terahertz waves, a narrow band of approximately 1 THz located between microwaves and far-infrared radiation. Terahertz heating is essentially an "external" form of heating, similar to heating a pot first and then heating the water. Therefore, as the heating process progresses, the number of water molecules decreases, and the effectiveness of directly heating water with a microwave heating tube diminishes, necessitating a transition to infrared heating. Far-infrared and infrared heating are highly effective for non-polar molecules, including plastics, wood, and insulation materials.
[0022] This technology integrates "pipe heating" and "wave heating." It's a comprehensive heating technology that primarily uses pipe heating and secondarily uses wave heating. Larger amounts of heat are still generated using a pipe heating system combined with hot air circulation. Wave heating serves as an auxiliary heating function at different stages, overcoming the shortcomings of simple pipe heating or heating with a single wavelength.
[0023] When drying a 10kV distribution transformer, the vacuum tank may contain three rows of products or even two additional layers. Metal shielding is essential, and numerous reflectors are installed inside. Furthermore, regardless of the type of transformer coil, there are gaps of varying sizes, allowing for some diffraction of electromagnetic waves. Infrared waves have even stronger penetrating power. The full-band utilization and intelligent configuration of these waves ensure uniform heating of the transformer windings. The core temperature doesn't need to be too high; it primarily relies on the initial heating from the coil coils and the waves passing through the coil gaps. For products in the 35kV-110kV voltage range, generally only one row is loaded in the tank, eliminating the issue of multiple products obstructing each other's path.
[0024] It should be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.
Claims
1. Transformer vacuum drying treatment apparatus with wave heating, comprising a vacuum tank, characterized in that, The vacuum tank is internally provided with a heating pipe drying device, a plurality of reflection plates are internally provided in the vacuum tank, a wave heating pipe frame without a bottom plate is internally provided in the heating pipe space of the heating pipe drying device without a wind channel plate, a wave heating pipe is internally provided in the wave heating pipe frame, a wave heating plate is internally provided in the top and the sidewall wind channel plate of the heating pipe drying device, and an intelligent control device is externally provided on the vacuum tank.
2. The transformer vacuum drying process apparatus with wave heating according to claim 1, characterized in that, The wave heating plate is electrically connected with the intelligent control device.
3. The transformer vacuum drying process apparatus with wave heating according to claim 1, characterized in that, The wave heating plate is composed of the wave heating pipes providing different frequency wavelengths.
4. The transformer vacuum drying process apparatus with wave heating according to claim 1, characterized in that, The wave heating pipe is composed of a microwave heating pipe, a terahertz heating pipe, a far infrared ray heating pipe and an infrared ray heating pipe.