Electromagnetic wave radiation drying device and drying method

Abstract

The electromagnetic wave radiation drying device comprises a drying assembly, an electromagnetic wave radiation assembly and a reflection assembly, the drying assembly comprises a drying box and a vacuum machine, the drying box is provided with a plurality of inner side faces, and the electromagnetic wave radiation assembly comprises a plurality of electromagnetic wave radiation sources; the plurality of electromagnetic wave radiation sources are respectively arranged on the plurality of inner side surfaces, the reflection assembly comprises a plurality of reflection parts, the plurality of reflection parts are respectively arranged on the plurality of inner side surfaces, and the number of the electromagnetic wave radiation sources on each inner side surface is greater than that of the reflection parts; according to the electromagnetic wave radiation drying device and method, electromagnetic waves are sent through the electromagnetic wave radiation source so as to dry the to-be-dried object in the drying box, meanwhile, a vacuum environment can be formed in the drying box through the vacuum machine, the electromagnetic wave energy transmission efficiency is improved, and the electromagnetic waves can be reflected through the reflection component; full coverage of electromagnetic waves in the drying box is guaranteed, the drying effect is guaranteed, and energy consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of drying equipment, and in particular to an electromagnetic wave radiation drying device and a drying method. Background Art

[0002] The insulating materials of power transformers are usually paper, bakelite and other insulating materials. They may absorb moisture during long-term storage or transportation, resulting in an increase in their dielectric constant and dielectric loss, and a decrease in the insulation of the insulating components, thereby reducing the service life of the power transformer and increasing the operating risks of the power transformer. Therefore, the drying treatment of insulating materials is very important for the production of power transformers.

[0003] At present, the drying methods for insulating materials are usually air drying and heating drying methods, but such drying methods require a long drying time, low drying efficiency, and high energy consumption for drying, which is inconvenient to be applied to power transformers. Summary of the invention

[0004] Based on this, it is necessary to provide an electromagnetic wave radiation drying device and a drying method to address the problems of long drying time, low drying efficiency and high drying energy consumption in the above-mentioned drying method.

[0005] According to one aspect of the present application, there is provided an electromagnetic wave radiation drying device, comprising:

[0006] A drying assembly, comprising a drying box and a vacuum machine, wherein the drying box has a plurality of inner sides, and the vacuum machine is connected to the drying box and can evacuate the drying box;

[0007] An electromagnetic wave radiation component, comprising a plurality of electromagnetic wave radiation sources, the electromagnetic wave radiation sources are used to generate electromagnetic wave radiation, and the plurality of electromagnetic wave radiation sources are respectively arranged on a plurality of the inner side surfaces;

[0008] A reflective assembly, comprising a plurality of reflective components, wherein the reflective components are used to reflect electromagnetic wave radiation, and the plurality of reflective components are respectively arranged on a plurality of the inner side surfaces;

[0009] Wherein, the number of the electromagnetic wave radiation sources on each of the inner sides is greater than the number of the reflective components.

[0010] In one of the embodiments, the electromagnetic wave radiation source is detachably connected to the drying box.

[0011] In one embodiment, the shape of the electromagnetic wave radiation source is one or more of a rectangular, square, circular, triangular, diamond, and corrugated shape.

[0012] In one embodiment, the shapes of the plurality of electromagnetic wave radiation sources are consistent.

[0013] In one embodiment, the plurality of inner side surfaces include the front side surface, rear side surface, left side surface, right side surface, upper side surface and lower side surface of the drying box, the front side surface and the rear side surface are arranged opposite to each other, and the number of the electromagnetic wave radiation sources and the number of the reflecting components on the front side surface are consistent with the number of the electromagnetic wave radiation sources and the number of the reflecting components on the rear side surface.

[0014] In one embodiment, the left side surface and the right side surface are arranged opposite to each other, and the number of the electromagnetic wave radiation sources and the number of the reflecting components on the left side surface are consistent with the number of the electromagnetic wave radiation sources and the number of the reflecting components on the right side surface; the upper side surface and the lower side surface are arranged opposite to each other, and the number of the electromagnetic wave radiation sources and the number of the reflecting components on the upper side surface are consistent with the number of the electromagnetic wave radiation sources and the number of the reflecting components on the lower side surface.

[0015] In one of the embodiments, the number of the electromagnetic wave radiation sources and the number of the reflective components on the left side surface are consistent with the number of the electromagnetic wave radiation sources and the number of the reflective components on the upper side surface.

[0016] In one of the embodiments, the number of the electromagnetic wave radiation sources on the front side is less than the number of the electromagnetic wave radiation sources on the left side.

[0017] In one embodiment, the drying component further includes a cooling component, and the cooling component is disposed on the drying box.

[0018] According to another aspect of the present application, a drying method is provided, which is used in the above-mentioned electromagnetic wave radiation drying device, comprising:

[0019] Adjust the number and shape of electromagnetic wave radiation sources in the drying box according to the type of the object to be dried;

[0020] Place the object to be dried into the drying oven;

[0021] Control the vacuum machine to evacuate the drying box;

[0022] The electromagnetic wave radiation source is controlled to emit electromagnetic waves, and the reflective component is used to reflect the electromagnetic waves to achieve radiation drying of the object to be dried.

[0023] The above-mentioned electromagnetic wave radiation drying device and drying method send electromagnetic waves through an electromagnetic wave radiation source to dry the object to be dried in a drying box. At the same time, the vacuum machine can form a vacuum environment in the drying box to improve the efficiency of electromagnetic wave energy transmission. The reflective component can reflect the electromagnetic waves to ensure that the electromagnetic waves are fully covered in the drying box, thereby improving the drying efficiency, reducing the drying time, and effectively saving energy consumption while ensuring the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of an electromagnetic wave radiation drying device according to some embodiments of the present application.

[0025] FIG2 is a schematic diagram of the structure of the electromagnetic wave radiation drying device in another state according to some embodiments of the present application.

[0026] FIG3 is a schematic structural diagram of the electromagnetic wave radiation drying device in another state according to some embodiments of the present application.

[0027] FIG. 4 is a schematic flow chart of an electromagnetic wave radiation drying method according to some embodiments of the present application.

[0028] Reference numerals:

[0029] 1. Drying assembly; 11. Drying box; 12. Front side; 13. Rear side; 14. Left side; 15. Right side; 16. Upper side; 17. Lower side; 18. Track;

[0030] 2. Electromagnetic wave radiation component; 21. Electromagnetic wave radiation source;

[0031] 3. Reflection assembly; 31. Reflection component. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0038] Transformer drying technology is a key technology used to process the insulating materials of power transformers. The insulating materials of power transformers are usually insulating materials such as paper and bakelite. They may absorb moisture during long-term storage or transportation. After the insulating materials absorb moisture, their dielectric constant and dielectric loss will increase, resulting in reduced insulation of the insulating components, which may cause breakdown and other faults in the power transformer, seriously affecting the normal operation of the power transformer, reducing the service life of the power transformer and increasing the operating risk of the power transformer. Therefore, keeping the insulating materials dry is a key factor in measuring whether the power transformer can operate normally. Traditional insulating material drying technology usually uses air drying and heating drying, but this drying method has the disadvantages of long drying time, high drying loss, and low drying efficiency. It cannot completely eliminate water molecules in the insulating components of the power transformer or destroy other molecular chains in the insulating components. That is, it can be understood that in the manufacturing and maintenance process of the transformer, vacuum drying is a key step used to remove moisture from the transformer material to ensure its insulation performance. The equipment used in this process is mainly a vacuum dryer. However, in the prior art, the vacuum dryer lacks heat pipes or other heating elements, which makes the temperature distribution in the vacuum drying tank uneven, resulting in low heating efficiency; and the vacuum drying in the prior art only relies on heating for drying, causing local overheating of the transformer or insufficient drying of some coils during the drying process; and a longer drying time is required to achieve the desired drying effect, resulting in increased energy consumption.

[0039] Therefore, the present application provides an electromagnetic wave radiation drying device and a drying method, which saves drying time, reduces drying loss, improves drying efficiency, and reduces water molecules in the insulating components of the power transformer by reasonably selecting the size, shape, number and electromagnetic wave frequency of the electromagnetic wave radiation plate in the box. The safe and reliable operation of the power transformer is ensured. Subsequent experiments have verified that, taking a 400kVA power transformer as an example, the traditional vacuum drying technology dries 30 power transformers each time, and the required drying time is 20 hours, and the electric energy consumed each time can reach 1200 degrees of electricity. There are problems such as economic and energy loss. When the electromagnetic wave radiation drying device and drying method provided by the present application are used, taking a 400kVA power transformer as an example, 30 power transformers are dried each time, and the required time is 8 hours, and the electric energy consumed each time can reach 500 degrees of electricity, which can significantly reduce the power loss and the required time.

[0040] Referring to Figures 1 to 3, an embodiment of the present application provides an electromagnetic wave radiation drying device, including a drying component 1, an electromagnetic wave radiation component 2 and a reflection component 3. The drying component 1 is used to accommodate the object to be dried. In the embodiment of the present application, the object to be dried is a transformer. The electromagnetic wave radiation component 2 is used to generate electromagnetic wave radiation to vacuum dry the object to be dried in the drying component 1. The reflection component 3 is used to receive the electromagnetic wave radiation and reflect the radiation, so that the electromagnetic wave can achieve full coverage in the drying component 1, so as to improve the drying efficiency, reduce the drying time, ensure the drying effect, and effectively save energy consumption.

[0041] In a specific configuration, the drying assembly 1 includes a drying box 11 and a vacuum machine. The vacuum machine is connected to the drying box 11 and can evacuate the drying box 11. The drying box 11 is a container for accommodating objects or samples that need to be processed in a vacuum environment. The drying box 11 has several inner sides and a sealing structure to ensure that the vacuum is not broken. In addition, a track 18 is also provided in the drying box 11. The track 18 can be used in conjunction with a transport component so that the object to be dried can be transported to the drying box 11 by the transport component for vacuum drying.

[0042] The electromagnetic wave radiation component 2 includes a plurality of electromagnetic wave radiation sources 21, which are respectively arranged on a plurality of inner side surfaces. The electromagnetic wave radiation is generated by the plurality of electromagnetic wave radiation sources 21 at the same time, so as to vacuum dry the object to be dried in the drying component 1. The reflection component 3 includes a plurality of reflection components 31, which are respectively arranged on a plurality of inner side surfaces, so as to reflect the electromagnetic wave radiation generated by the plurality of electromagnetic wave radiation sources 21, so as to improve the coverage effect of the electromagnetic wave in the drying component 1.

[0043] Specifically, in the embodiment of the present application, the drying box 11 has a front side 12, a rear side 13, a left side 14, a right side 15, an upper side 16 and a lower side 17. A plurality of electromagnetic wave radiation sources 21 are respectively arranged on the front side 12, the rear side 13, the left side 14, the right side 15, the upper side 16 and the lower side 17 of the drying box 11, so that each inner side of the drying box 11 is provided with an electromagnetic wave radiation source 21. A plurality of reflective components 31 are respectively arranged on the front side 12, the rear side 13, the left side 14, the right side 15, the upper side 16 and the lower side 17 of the drying box 11, so that each inner side of the drying box 11 is provided with a reflective component 31.

[0044] It can be understood that in one embodiment, the reflective component 3 includes 6 reflective components 31, and the 6 reflective components 31 are respectively arranged on the front side 12, the rear side 13, the left side 14, the right side 15, the upper side 16 and the lower side 17. And in this embodiment, the reflective component 31 is a mirror plate that can cover the entire side. This structure can maximize the reflection effect. In another embodiment, the reflective component 3 includes more than 6 reflective components 31, and the front side 12, the rear side 13, the left side 14, the right side 15, the upper side 16 and the lower side 17 are all provided with a plurality of reflective components 31. In this embodiment, the reflective component 31 is a mirror plate that is smaller than the area of ​​the entire side. This structure can improve the reflection effect while ensuring the cost.

[0045] More specifically, the number of electromagnetic wave radiation sources 21 on each inner side surface is greater than the number of reflective components 31, so that a larger number of electromagnetic wave radiation sources 21 can emit more electromagnetic waves, thereby ensuring the coverage effect of the electromagnetic waves in the drying box 11, and enabling the electromagnetic waves to achieve full coverage in the drying component 1 while effectively controlling costs.

[0046] It is understandable that with the increase in the number of electromagnetic wave radiation sources 21 and the different installation positions, the uniformity of internal heating can be improved, thereby accelerating the drying process. More electromagnetic wave radiation sources 21 mean that more heat can be transferred to the inside of the transformer more evenly, accelerating the evaporation of water. However, the increase in the number of electromagnetic wave radiation sources 21 will also increase the system cost, so it is necessary to balance efficiency and cost. That is, the more the number of electromagnetic wave radiation sources 21, the higher the cost. However, the present application provides an electromagnetic wave radiation source 21 and a reflective component 31 on each inner side of the drying box 11, and the number of electromagnetic wave radiation sources 21 on each inner side is greater than the number of reflective components 31, so that the electromagnetic wave energy can be fully covered in the drying component 1 while effectively controlling the cost, thereby effectively saving energy consumption while improving the drying efficiency, reducing the drying time, and ensuring the drying effect.

[0047] The inventor has conducted a large number of experiments to verify this, and found that when the number of electromagnetic wave radiation sources 21 on each inner side surface is greater than three times the number of reflective components 31, the power consumption of each furnace is between 1000 degrees and 1500 degrees of electricity, and the time consumed is between 10 hours and 15 hours. When the number of electromagnetic wave radiation sources 21 on each inner side surface is less than three times the number of reflective components 31, the power consumption of each furnace is between 2000 degrees and 5000 degrees of electricity, and the time consumed is between 60 hours and 80 hours. When the number of electromagnetic wave radiation sources 21 on each inner side surface is equal to the number of reflective components 31, the power consumption of each furnace is more than 5000 degrees of electricity, and the time consumed is more than 80 hours. It can be further verified that when the number of electromagnetic wave radiation sources 21 on each inner side surface is greater than the number of reflective components 31, the drying efficiency can be effectively improved, the drying time can be reduced, and energy consumption can be saved.

[0048] The microwave frequency used in vacuum drying is usually a high frequency within the industrial microwave range, generally between 1 GHz and 100 GHz. In the embodiment of the present application, the frequency range of the electromagnetic wave emitted by the electromagnetic wave radiation source 21 is 0.3THz-10THz. The electromagnetic wave in this frequency range has strong penetrating power, which has a more obvious effect on the drying efficiency and drying time, and the required starting temperature is relatively low, which can avoid the damage of other molecular chains in the dried body except water molecules due to excessive temperature. In addition, when the vacuum radiation drying technology is used in the range of 0.3THz-0THz in a drying container of 5 meters long, 4 meters wide and 3 meters high, the power consumption of each furnace is 1000 degrees, and each furnace takes 15 hours, which can effectively save electricity and time.

[0049] In summary, the electromagnetic wave radiation drying device of the present application can send electromagnetic waves through the electromagnetic wave radiation source 21 to dry the object to be dried in the drying box 11, and at the same time form a vacuum environment in the drying box 11 through the vacuum machine to improve the efficiency of electromagnetic wave energy transmission, and through the precise layout of the size, shape and number of the electromagnetic wave radiation source 21 in the drying box 11, cooperate with the reflective component 31 to reflect the electromagnetic waves, so that the electromagnetic waves can achieve full coverage in the drying box 11, improve the drying efficiency, reduce the drying time, and effectively save energy while ensuring the drying effect.

[0050] In order to verify the energy saving effect between the electromagnetic wave radiation drying device of the present application and the drying device in the prior art, the inventor conducted a large number of experiments for verification and summarized the following table:

[0051]

[0052] According to the above table, when drying 400kVA and below devices, the electromagnetic wave radiation drying device of the present application saves 700 kWh of electricity per furnace and saves 12 hours. If 10,000 units are produced each year, a total of about 333 furnaces are required, one furnace per day, which means an annual energy saving of 230,000 kWh of electricity and a time saving of 3,996 hours.

[0053] When drying a 3300kVA device body, the electromagnetic wave radiation drying device of the present application saves 1700 kWh of electricity per furnace and saves 28 hours. If 3000 units are produced each year, a total of 600 furnaces are required, two furnaces per day, which means 1.02 million kWh of electricity can be saved each year and 16,800 hours can be saved.

[0054] According to the comparison results, the vacuum radiation transformer drying system and method provided by the present invention can shorten the drying time, improve the drying efficiency, reduce the energy consumption, and solve the shortcomings of low drying efficiency and high drying energy consumption brought about by the traditional drying technology.

[0055] 1 and 2, in one embodiment, the electromagnetic wave radiation source 21 is detachably connected to the drying box 11. Through the detachable connection mode, the size, quantity and shape of the electromagnetic radiation source can be adjusted according to the needs, thereby specifically improving the drying efficiency, reducing the drying energy consumption, ensuring the operation efficiency of the device, and reducing the economic cost.

[0056] Specifically, in the embodiment of the present application, the electromagnetic wave radiation source 21 is an electromagnetic wave radiation plate, and the reflective component 31 is a mirror reflective plate. The electromagnetic wave radiation plate is detachably connected to the drying box 11, and the mirror reflective plate is detachably connected to the drying box 11. The detachable connection method also facilitates the subsequent maintenance and replacement of the electromagnetic wave radiation source 21 and the reflective component 31.

[0057] In addition, the electromagnetic wave radiation sources 21 are all equipped with corresponding temperature detection systems to monitor the temperature of the electromagnetic wave radiation sources 21 in real time, and also provide a basis for subsequent maintenance. Specifically, the electromagnetic wave radiation drying device also includes a plurality of temperature detection units, and the plurality of temperature detection units are arranged in a one-to-one correspondence with the plurality of electromagnetic wave radiation sources 21. The detection end of each temperature detection unit is in contact with the corresponding electromagnetic wave radiation source 21 to monitor the temperature of the electromagnetic wave radiation source 21 in real time.

[0058] In one embodiment, the shape of the electromagnetic wave radiation source 21 is one or more of a rectangle, a square, a circle, a triangle, a diamond, and a corrugated shape. It is understandable that the shape of the electromagnetic wave radiation source 21 will affect the radiation uniformity, heat transfer efficiency, adaptability of the drying prototype and energy utilization of the vacuum drying technology. Electromagnetic wave radiation sources 21 of different shapes can directly affect the distribution uniformity of the radiant heat energy of the object to be dried. Radiation sources of different shapes may cause uneven distribution of radiant heat on the surface of the drying prototype, thereby affecting the drying effect. And electromagnetic wave radiation sources 21 of different shapes may have different adaptability, which can better adapt to different shapes, sizes and types of drying objects. That is, the shape of the electromagnetic wave radiation source 21 will affect the energy utilization rate and the heat transfer efficiency in the drying box 11. Reasonable selection of the shape of the electromagnetic wave radiation plate can speed up the drying speed of the object to be dried and reduce energy waste, which not only effectively improves the drying efficiency but also reduces energy loss, and has a significant impact on the economy.

[0059] The present application divides the shape design of the electromagnetic wave radiation source 21 into rectangular, square, circular, triangular, diamond, and corrugated shapes, so that the operator can reasonably choose the shape of the electromagnetic wave radiation source 21 according to the size, shape, and drying requirements of the transformer prototype to be dried.

[0060] It is worth mentioning that after a large number of experimental verifications, the inventor found that when a circular electromagnetic wave radiation source 21 is used, the power consumption of each furnace is 1000 degrees, each furnace consumes 14.8 hours, and the micro-water content is controlled within 20ppm. When a rectangular electromagnetic wave radiation source 21 is used, the power consumption of each furnace is 1000 degrees, each furnace consumes 15 hours, and the micro-water content is controlled within 20ppm-35ppm. When a triangular electromagnetic wave radiation source 21 is used, the power consumption of each furnace is 1000 degrees, each furnace consumes 15 hours, and the micro-water content is controlled within 20ppm. When a diamond electromagnetic wave radiation source 21 is used, the power consumption of each furnace is 1000 degrees, each furnace consumes 15 hours, and the micro-water content is controlled within 20ppm. When a corrugated electromagnetic wave radiation source 21 is used, the power consumption of each furnace is 1000 degrees, each furnace consumes 15 hours, and the micro-water content is controlled within 20ppm-35ppm.

[0061] It can be understood that, due to the different insulating media used for conventional transformers, small-capacity transformers, air-cooled dry-type transformers and large transformers, the micro-water content after drying is different. When the electromagnetic wave radiation drying device of the present application is used to vacuum dry a conventional transformer, a rectangular electromagnetic wave radiation plate or a square electromagnetic wave radiation plate can be selected so that the micro-water content of the insulating material can be controlled within 20ppm. When the electromagnetic wave radiation drying device of the present application is used to vacuum dry a small-capacity transformer, a circular electromagnetic wave radiation plate can be selected, and multiple circular electromagnetic wave radiation plates can be arranged side by side so that the micro-water content of the insulating material can be controlled within 20ppm. When the electromagnetic wave radiation drying device of the present application is used to vacuum dry an air-cooled dry-type transformer, a triangular electromagnetic wave radiation plate or a diamond electromagnetic wave radiation plate can be selected so that the micro-water content of the insulating material can be controlled within 20ppm. When the electromagnetic wave radiation drying device of the present application is used to vacuum dry a large transformer, a corrugated electromagnetic wave radiation plate can be selected so that the micro-water content of the insulating material can be controlled within 35ppm.

[0062] In addition, in the embodiment of the present application, the shapes of the multiple electromagnetic wave radiation sources 21 are consistent, so as to better control the radiation uniformity, heat transfer efficiency, adaptability of the drying prototype and energy utilization rate of the electromagnetic wave radiation drying device.

[0063] In one embodiment, the length of the electromagnetic wave radiation source 21 is in the range of greater than or equal to 10 cm and less than or equal to 2 m. The width of the electromagnetic wave radiation source 21 is in the range of greater than or equal to 5 cm and less than or equal to 30 cm. The height of the width of the electromagnetic wave radiation source 21 is in the range of greater than or equal to 50 cm and less than or equal to 1.5 m. It is understandable that larger radiation sources generally provide more uniform heating because they can cover a wider surface area. This helps to ensure that all parts inside the transformer are sufficiently heated, thereby removing moisture more evenly. However, larger radiation sources may require larger system designs and higher costs. Therefore, when selecting the size of the radiation source, it is necessary to weigh the relationship between drying speed, heating uniformity, and system cost.

[0064] After a large number of experiments and verifications, the inventors found that in a drying box 11 that is 5 meters long, 4 meters wide, and 3 meters high, when the length of the electromagnetic wave radiation source 21 is in the range of 10 cm<=L<=2m, each furnace consumes 1000 degrees of electricity and each furnace takes 15 hours; when the length of the electromagnetic wave radiation source 21 is in the range of 5 cm<=L<=30 cm, each furnace consumes 10 degrees of electricity and each furnace takes 0.5 hours; when the length of the electromagnetic wave radiation source 21 is in the range of 50 cm<=L<=1.5m, each furnace consumes 900 degrees of electricity and each furnace takes 14 hours.

[0065] That is, the length of the electromagnetic wave radiation source 21 is related to the size of the drying container. When the size of the electromagnetic wave radiation source 21 is not within the above-mentioned size range, it will affect the manufacture of the electromagnetic wave radiation source 21, especially the electromagnetic wave generating material will cause a great waste. Therefore, after considering the relationship between drying efficiency and input cost, the electromagnetic wave radiation source 21 selected in this application has a length of 10cm-2m, a width of 5cm-30cm, and a height of 50cm-1.5m.

[0066] Referring to FIG. 1 and FIG. 2 , in one embodiment, the plurality of inner side surfaces include the front side surface 12, the rear side surface 13, the left side surface 14, the right side surface 15, the upper side surface 16 and the lower side surface 17 of the drying box 11, the front side surface 12 and the rear side surface 13 are arranged opposite to each other, and the number of electromagnetic wave radiation sources 21 and the number of reflection components 31 on the front side surface 12 are consistent with the number of electromagnetic wave radiation sources 21 and the number of reflection components 31 on the rear side surface 13. The left side surface 14 and the right side surface 15 are arranged opposite to each other, and the number of electromagnetic wave radiation sources 21 and the number of reflection components 31 on the left side surface 14 are consistent with the number of electromagnetic wave radiation sources 21 and the number of reflection components 31 on the right side surface 15; the upper side surface 16 and the lower side surface 17 are arranged opposite to each other, and the number of electromagnetic wave radiation sources 21 and the number of reflection components 31 on the upper side surface 16 are consistent with the number of electromagnetic wave radiation sources 21 and the number of reflection components 31 on the lower side surface 17. By making the number of electromagnetic wave radiation sources 21 and the number of reflective components 31 between the two relatively arranged inner side surfaces consistent, the electromagnetic wave radiation sources 21 and the reflective components 31 on each inner side surface can be effectively coordinated, so that the electromagnetic wave energy can be fully covered in the drying component 1 while effectively controlling the cost, so as to effectively improve the drying efficiency, reduce the drying time, ensure the drying effect, and save energy consumption.

[0067] Specifically, in an embodiment of the present application, the number of electromagnetic wave radiation sources 21 and the number of reflective components 31 on the left side 14 are consistent with the number of electromagnetic wave radiation sources 21 and the number of reflective components 31 on the upper side 16. The number of electromagnetic wave radiation sources 21 on the front side 12 is less than the number of electromagnetic wave radiation sources 21 on the left side 14. It can be understood that the uniformity of internal heating can be improved with the increase in the number of electromagnetic wave radiation sources 21 and the difference in the installation position, thereby accelerating the drying process. More electromagnetic wave radiation sources 21 mean that more heat can be more evenly transferred to the inside of the transformer, accelerating the evaporation of water. However, an increase in the number of electromagnetic wave radiation sources 21 will also increase the system cost, so it is necessary to balance efficiency and cost.

[0068] Therefore, in the embodiment of the present application, the drying box 11 is 5 meters long, 4 meters wide, and 3 meters high. The number of electromagnetic wave radiation sources 21 on the left side 14, right side 15, upper side 16, and lower side 17 of the drying box 11 is 15, and the number of reflective components 31 is 1; the number of electromagnetic wave radiation sources 21 on the front side 12 and rear side 13 of the drying box 11 is 10, and the number of reflective components 31 is 1. This arrangement can save power and time to a large extent, and is the optimal arrangement solution.

[0069] In order to ensure the accuracy of the above scheme, the inventors conducted corresponding experimental verification. The verification data is:

[0070] When 14 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the left side 14 of the drying box 11 which is 5 meters long, 4 meters wide and 3 meters high, 14 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the right side 15 inside the drying box 11, 14 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the upper side 16 inside the drying box 11, 14 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the lower side 17 inside the drying box 11, 10 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the front side 12 inside the drying box 11, and 10 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the rear side 13 inside the drying box 11, the power consumption of each furnace is 1200 degrees and the time consumption of each furnace is 20 hours.

[0071] When 15 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the left side 14 of the drying box 11 which is 5 meters long, 4 meters wide and 3 meters high, 15 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the right side 15 inside the drying box 11, 15 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the upper side 16 inside the drying box 11, 15 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the lower side 17 inside the drying box 11, 10 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the front side 12 inside the drying box 11, and 10 electromagnetic wave radiation sources 21 and 1 reflecting component 31 are installed on the rear side 13 inside the drying box 11, the power consumption of each furnace is 1000 degrees and each furnace takes 15 hours.

[0072] When 16 electromagnetic wave radiation sources 21 and 1 reflective component 31 are installed on the left side 14 of the drying box 11 which is 5 meters long, 4 meters wide and 3 meters high, 16 electromagnetic wave radiation sources 21 and 1 reflective component 31 are installed on the right side 15 inside the drying box 11, 16 electromagnetic wave radiation sources 21 and 1 reflective component 31 are installed on the upper side 16 inside the drying box 11, 16 electromagnetic wave radiation sources 21 and 1 reflective component 31 are installed on the lower side 17 inside the drying box 11, 12 electromagnetic wave radiation sources 21 and 1 reflective component 31 are installed on the front side 12 inside the drying box 11, and 12 electromagnetic wave radiation sources 21 and 1 reflective component 31 are installed on the rear side 13 inside the drying box 11, the power consumption in each furnace is 1500 degrees and each furnace takes 12 hours.

[0073] Therefore, when 15 electromagnetic wave radiation sources 21 and 1 reflective component 31 are installed on the left side 14, right side 15, upper side 16 and lower side 17 of the drying box 11 which is 5 meters long, 4 meters wide and 3 meters high, and 10 electromagnetic wave radiation sources 21 and 1 reflective component 31 are installed on the front side 12 and rear side 13 of the drying box 11, electric energy and time can be saved to a great extent, which is the optimal quantity arrangement scheme.

[0074] In one embodiment, the drying assembly 1 further includes a cooling component, which is disposed on the drying box 11 to ensure control of the temperature of the drying box 11. That is, when the temperature of the drying box 11 needs to be increased, the electromagnetic wave radiation source 21 is used to generate heat to increase the temperature, and when the temperature needs to be reduced, the cooling component is used to reduce the temperature. In the embodiment of the present application, the cooling component is an air cooling device.

[0075] In addition, in order to effectively control the temperature of the drying box 11 and the objects to be dried in the drying box 11 , an environmental temperature tester, a power transformer core temperature tester and a power transformer body temperature tester are installed inside the drying box 11 .

[0076] Specifically, the environment temperature tester is arranged in the drying box 11, and is used to perform real-time temperature detection on the internal environment temperature of the drying box 11. The power transformer core temperature tester is arranged in the drying box 11, and can be in contact with the core of the object to be dried (transformer) after the object to be dried (transformer) is placed in the drying box 11, so as to perform real-time temperature detection on the core temperature of the object to be dried (transformer). The power transformer body temperature tester is arranged in the drying box 11, and can be in contact with the body of the object to be dried (transformer) after the object to be dried (transformer) is placed in the drying box 11, so as to perform real-time temperature detection on the body temperature of the object to be dried (transformer).

[0077] In one embodiment, the drying box 11 includes a box body and a box door, which is openably connected to the box body. When the objects to be dried need to be taken in and out, the box door is in an open state, and when the objects to be dried are being dried, the box door is in a closed state.

[0078] In addition, a first limit switch, a second limit switch, a tractor and a reducer may be provided between the box body and the box door. The tractor and the reducer may cooperate to control the closing and opening of the box door. The first limit switch and the second limit switch may cooperate to control the degree of closing and opening of the box door. It is understandable that when the tractor and the reducer cooperate to control the closing and opening of the box door, after the box door reaches the maximum opening and closing degree, the first limit switch is triggered, and the box door maintains the maximum opening and closing state. After the box door reaches the maximum closing degree, the second limit switch is triggered, and the box door maintains the maximum closing state.

[0079] In one embodiment, the drying box 11 is also connected to an air compressor, a gas storage tank, a condenser, a pneumatic valve, an air seepage valve and an air piercing valve. The air compressor is connected to the gas storage tank through a delivery pipeline, and the gas storage tank is connected to the inside of the drying box 11 through a gas delivery pipeline. When the drying is completed, the gas inside the box is discharged through the pneumatic valve, and the discharged gas is stored in the condenser. After being cooled by the air cooling device, it is decomposed into gas and liquid. The gas is discharged through the vacuum valve and discharged to the outside through the manual smoke exhaust valve. The liquid is discharged through the water collection valve and discharged to the outside through the manual drain valve. It can be understood that the air seepage valve plays a role in protecting the safe and stable operation of the pipeline system, and the air piercing valve plays a role in ensuring that the drying system operates within an appropriate pressure range.

[0080] Referring to FIG. 4 , according to another aspect of the present application, a drying method is provided, which is used in the above-mentioned electromagnetic wave radiation drying device, comprising:

[0081] The number and shape of the electromagnetic wave radiation sources in the drying box are adjusted according to the type of the object to be dried. Specifically, when vacuum drying a small-capacity transformer, a circular electromagnetic wave radiation source is selected, when vacuum drying an air-cooled dry-type transformer, a rectangular, triangular or diamond-shaped electromagnetic wave radiation source is selected, and when vacuum drying a large transformer, a rectangular, triangular, diamond or corrugated electromagnetic wave radiation source is selected. And when the size of the drying box is 5 meters long, 4 meters wide, and 3 meters high, 15 electromagnetic wave radiation sources and 1 reflective component are installed on the left side, right side, upper side, and lower side of the drying box, and 10 electromagnetic wave radiation sources and 1 reflective component are installed on the front side and rear side of the drying box.

[0082] Put the objects to be dried into the drying box. Specifically, the tractor and the reducer control the closing and opening of the drying box door through the flap bridge, and control the degree of closing and opening of the box door through the first limit switch and the second limit switch. After the objects to be dried are transported into the box, the door is closed.

[0083] Control the vacuum machine to evacuate the drying box. Specifically, the vacuum machine delivers compressed air to the gas storage tank, and then inputs the compressed air into the drying box through the pipeline to achieve a vacuum state inside the drying box. The flow of gas in the closed system can be controlled by the air leakage valve, and the closed system can be protected from overpressure or other dangerous conditions by the air breaker valve.

[0084] The electromagnetic wave radiation source is controlled to emit electromagnetic waves, and the electromagnetic waves are reflected by the reflective component to achieve radiation drying of the object to be dried. Specifically, the electromagnetic wave heating technology is adopted to control the frequency of the electromagnetic waves emitted by the electromagnetic wave radiation source within the range of 0.3THz-10THz, and the object to be dried in the drying box is radiated and dried. The penetration effect of the electromagnetic waves is ensured by the frequency range of 0.3THz-10THz, thereby improving the drying efficiency and reducing the drying time. Moreover, since the starting temperature required in this frequency range is relatively low, it can avoid the damage of other molecular chains in the drying body except water molecules due to excessive temperature.

[0085] During the drying process, the electromagnetic waves emitted by the electromagnetic wave radiation source are reflected by the reflective components, so that the electromagnetic waves are fully covered in the drying box. The temperature of the electromagnetic wave radiation source is monitored in real time by the temperature detection system to provide a basis for subsequent maintenance. In the drying process, the generated water vapor can be discharged through the pneumatic valve, and the temperature of the discharged water vapor is reduced under the action of the condenser and the cooling components. The water vapor is then separated from the gas and liquid by the evacuation valve and the water collection valve. The gas is discharged by the manual exhaust valve, and the liquid is discharged by the manual drain valve.

[0086] In summary, when the drying method of the present application is applied to an electromagnetic wave radiation drying device, by reasonably selecting the size, shape, number and electromagnetic wave frequency of the electromagnetic wave radiation source in the box, it is possible to save drying time, reduce drying losses and improve drying efficiency. Electromagnetic waves are sent by the electromagnetic wave radiation source to dry the objects to be dried in the drying box. At the same time, the vacuum machine can form a vacuum environment in the drying box to improve the efficiency of electromagnetic wave energy transfer. The reflective component can reflect the electromagnetic waves to ensure that the electromagnetic waves are fully covered in the drying box, improve drying efficiency, reduce drying time, and effectively save energy while ensuring the drying effect.

[0087] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An electromagnetic wave radiation drying device, characterized in that: include: A drying assembly, comprising a drying box and a vacuum machine, wherein the drying box has a plurality of inner sides, and the vacuum machine is connected to the drying box and can evacuate the drying box; An electromagnetic wave radiation component, comprising a plurality of electromagnetic wave radiation sources, the electromagnetic wave radiation sources are used to generate electromagnetic wave radiation, and the plurality of electromagnetic wave radiation sources are respectively arranged on a plurality of the inner side surfaces; The reflective assembly comprises a plurality of reflective components, wherein the reflective components are used to reflect electromagnetic wave radiation, and the plurality of reflective components are respectively arranged on a plurality of the inner side surfaces.

2. The electromagnetic wave radiation drying device according to claim 1, characterized in that: The number of the electromagnetic wave radiation sources on each of the inner sides is greater than the number of the reflective components.

3. The electromagnetic wave radiation drying device according to claim 1, characterized in that: The electromagnetic wave radiation source is detachably connected to the drying box.

4. The electromagnetic wave radiation drying device according to claim 1, characterized in that: The shapes of the multiple electromagnetic wave radiation sources are consistent.

5. The electromagnetic wave radiation drying device according to claim 1, characterized in that: The plurality of inner side surfaces include a front side surface, a rear side surface, a left side surface, a right side surface, an upper side surface and a lower side surface of the drying box, the front side surface and the rear side surface are arranged opposite to each other, and the number of the electromagnetic wave radiation sources and the number of the reflecting components on the front side surface are consistent with the number of the electromagnetic wave radiation sources and the number of the reflecting components on the rear side surface.

6. The electromagnetic wave radiation drying device according to claim 5, characterized in that: The left side surface and the right side surface are arranged opposite to each other, and the number of the electromagnetic wave radiation sources and the number of the reflecting components on the left side surface are consistent with the number of the electromagnetic wave radiation sources and the number of the reflecting components on the right side surface; the upper side surface and the lower side surface are arranged opposite to each other, and the number of the electromagnetic wave radiation sources and the number of the reflecting components on the upper side surface are consistent with the number of the electromagnetic wave radiation sources and the number of the reflecting components on the lower side surface.

7. The electromagnetic wave radiation drying device according to claim 6, characterized in that: The number of the electromagnetic wave radiation sources and the number of the reflective components on the left side surface are consistent with the number of the electromagnetic wave radiation sources and the number of the reflective components on the upper side surface.

8. The electromagnetic wave radiation drying device according to claim 7, characterized in that: The number of the electromagnetic wave radiation sources on the front side surface is less than the number of the electromagnetic wave radiation sources on the left side surface.

9. The electromagnetic wave radiation drying device according to claim 1, characterized in that: The drying assembly further includes a cooling component, and the cooling component is disposed on the drying box.

10. A drying method, using the electromagnetic wave radiation drying device according to any one of claims 1 to 9, characterized in that: include: Adjust the number and shape of the electromagnetic wave radiation sources in the drying box according to the type of the object to be dried; placing the object to be dried into the drying oven; Controlling the vacuum machine to evacuate the drying box; The electromagnetic wave radiation source is controlled to emit electromagnetic waves, and the reflective component is used to reflect the electromagnetic waves, so as to achieve radiation drying of the object to be dried.

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