A microwave vacuum drying equipment

Abstract

The embodiment of the present invention relates to a microwave vacuum drying device, which includes a first vacuum tank; a second vacuum tank; a first vacuum pipe for connecting the upper part of the first vacuum tank with the upper part of the second vacuum tank; a second vacuum pipe for connecting the lower part of the first vacuum tank with the lower part of the second vacuum tank; the inner cavity of the first vacuum pipe, the inner cavity of the second vacuum pipe, the inner cavity of the first vacuum tank, and the inner cavity of the second vacuum tank are connected to form an annular chamber; it also includes a material circulation device, which is configured to carry the dried material and make the material circulate along the annular trajectory of the annular chamber; a plurality of microwave generators, which are configured to be used for microwave processing of materials; and a vacuum exhaust device, which is configured to exhaust the ambient gas in the annular chamber. The device can effectively reduce the volume of the drying device and improve the space utilization and production capacity of the device.

Description

Technical Field

[0001] The present invention relates to the field of microwave vacuum technology, and more specifically, to a microwave vacuum drying device. Background Art

[0002] Microwaves refer to electromagnetic waves with a frequency range of 300MHz to 300GHz. They were first used in military radar and communications. Later, people found that microwaves have a thermal effect on polar molecular materials, that is, materials with polar molecules repeatedly and rapidly orient and rotate under the action of microwave high-frequency electric fields to generate frictional heat. At the same time, microwaves are also penetrating, that is, when microwaves are irradiated to polar materials, they can penetrate deep into the material and heat both inside and outside at the same time, so the heating speed is fast and the efficiency is high. Among them, vacuum drying is a drying method that places the material under vacuum negative pressure conditions to reduce the boiling point of water, and appropriately heats the material to the boiling point under negative pressure or cools the material to solidify it and then dries it through the melting point. This drying method is suitable for the drying process of heat-sensitive materials. Microwave vacuum drying technology combines the advantages of microwave drying and vacuum drying, combining the rapid and efficient microwave drying with the characteristics of low-temperature evaporation of water under vacuum conditions, thereby achieving low-temperature rapid drying of materials.

[0003] The microwave vacuum drying equipment in the prior art mostly adopts a cylindrical tank body, and a central axis and a material tray located on the central axis are arranged inside the tank body. The central axis rotates to drive the material tray to perform uniform circular motion. In order to improve the ability of the equipment to process the amount of material at one time, the microwave vacuum drying equipment in the prior art usually adopts the method of increasing the diameter of the tank body. However, as the diameter of the equipment increases, the pressure on the equipment tank body also increases when it is subjected to external pressure. Therefore, the design wall thickness of the tank body also increases, which eventually leads to the volume of the microwave vacuum drying equipment being too large and bulky, and cannot meet the current demand for small-volume microwave vacuum drying equipment in industrial applications; at the same time, the space utilization rate of the microwave vacuum drying equipment has not been greatly improved. In addition, the surface temperature of the tank body of the microwave vacuum drying equipment will increase during long-term operation, which will cause the steam condensation effect inside the equipment to decrease, and then cause the vacuum degree inside the tank body to decrease, affecting the drying effect of subsequent materials.

[0004] Therefore, in order to overcome the defects of the prior art, it is necessary to provide a novel microwave vacuum drying equipment. Summary of the invention

[0005] The object of the present invention is to provide a microwave vacuum drying device with high production capacity, high space utilization, high vacuum degree inside the device, low processing and manufacturing difficulty and convenient for large-scale production.

[0006] In order to achieve at least one of the above-mentioned purposes, a microwave vacuum drying device is provided, the device comprising: a first vacuum tank; a second vacuum tank; a first vacuum pipe located on the upper layer for connecting the upper part of the first vacuum tank with the upper part of the second vacuum tank; and a second vacuum pipe located on the lower layer for connecting the lower part of the first vacuum tank with the lower part of the second vacuum tank; the first vacuum pipe and the second vacuum pipe are arranged in parallel; the inner cavity of the first vacuum pipe, the inner cavity of the second vacuum pipe, the inner cavity of the first vacuum tank and the inner cavity of the second vacuum tank are connected to form an annular chamber; the device also includes a loading circulation device located in the annular chamber, the loading circulation device is configured to carry the dried material and make the material circulate along the annular trajectory of the annular chamber; a plurality of microwave generators arranged on the outer surface of the first vacuum pipe and / or the second vacuum pipe, the microwave generator is configured to be used for microwave processing of the material carried on the loading circulation device; a vacuum exhaust device, the vacuum exhaust device is configured to exhaust the ambient gas in the annular chamber.

[0007] Optionally, the apparatus comprises a condensing device configured to condense the ambient gas in the annular chamber.

[0008] Optionally, there is an inclination angle between the central axis of the first vacuum pipe and the horizontal plane; there is an inclination angle between the central axis of the second vacuum pipe and the horizontal plane.

[0009] Optionally, the height of the end of the first vacuum tank connected to the first vacuum pipeline is lower than the height of the end of the second vacuum tank connected to the first vacuum pipeline;

[0010] The height of the end portion of the first vacuum tank connected to the second vacuum pipeline is lower than the height of the end portion of the second vacuum tank connected to the second vacuum pipeline.

[0011] Optionally, along the direction from the material input end to the material output end of the first vacuum pipe, the number of microwave generators on the outer surface of the first vacuum pipe decreases;

[0012] Along the direction from the material input end to the material output end of the second vacuum pipe, the number of microwave generators on the outer surface of the second vacuum pipe decreases.

[0013] Optionally, the microwave generator is arranged around the outer surface of the first vacuum pipe and / or the second vacuum pipe.

[0014] Optionally, the material loading circulation device includes two tracks arranged opposite to each other in the annular chamber and a material loading tray arranged between the two tracks arranged opposite to each other.

[0015] Optionally, the vacuum exhaust device includes a vacuum pump and a buffer tank;

[0016] The vacuum pump is communicated with the first vacuum pipeline and the second vacuum pipeline respectively through an exhaust pipeline, and the buffer tank is located on the exhaust pipeline.

[0017] Optionally, the condensing device includes a plurality of condensing tubes arranged on the inner wall of the first vacuum pipe and / or the second vacuum pipe and a chiller connected to the condensing tubes, and the chiller is configured to provide cold water and circulation power for the condensing tubes.

[0018] Optionally, the device includes a monitoring lighting device, which includes a lighting lamp that can be used to provide lighting inside the device and a plurality of sensors that can be used to monitor the temperature of the material in the device, the vacuum degree and the humidity in the annular chamber in real time.

[0019] Optionally, the microwave generator comprises a magnetron and an excitation cavity having one end connected to the magnetron, and the other end of the excitation cavity is connected and fixed to the first vacuum pipe and / or the second vacuum pipe;

[0020] The microwaves generated by the magnetron are fed into the inner cavity of the first vacuum pipe and / or the inner cavity of the second vacuum pipe through the excitation cavity.

[0021] The beneficial effects of the present invention are as follows:

[0022] The microwave vacuum drying equipment provided by the present invention can reduce the volume and wall thickness of the equipment, reduce the difficulty of processing and manufacturing the equipment, and reduce the manufacturing cost. At the same time, it can improve the space utilization rate and production capacity of the equipment, enhance the effect of microwave processing and steam condensation inside the equipment, and ensure that the vacuum degree inside the microwave vacuum drying equipment does not decrease during long-term operation; furthermore, the first vacuum pipeline and the second vacuum pipeline can be assembled in series through a plurality of vacuum pipeline sections, so that the microwave vacuum drying equipment can be widely used in different industrial environments, thereby improving the application range of the equipment.

[0023] In addition, along the direction from the material input end to the material output end of the first vacuum pipe, the number of microwave generators on the outer surface of the first vacuum pipe decreases; along the direction from the material input end to the material output end of the second vacuum pipe, the number of microwave generators on the outer surface of the second vacuum pipe decreases, so that the material can be quickly heated as soon as it enters the vacuum pipe. At the same time, the number of microwave generators decreases along the direction to the material output end, so that the temperature of the material can be maintained within a certain temperature range.

[0024] Furthermore, the device can perform microwave heating on the material from multiple directions at the same time by means of a material circulation device arranged in the first vacuum pipe and the second vacuum pipe and a microwave generator arranged around the outer surface of the first vacuum pipe and the second vacuum pipe, thereby expanding the effective area of ​​the material and the microwave, improving the uniformity of the microwave heating, and further enhancing the effect of the microwave processing inside the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A structural side view of a microwave vacuum drying apparatus according to an embodiment of the present invention is shown.

[0027] Figure 2 A structural front view of a microwave vacuum drying device according to an embodiment of the present invention is shown.

[0028] Figure 3 A schematic diagram of the internal structure of a vacuum pipeline according to an embodiment of the present invention is shown.

[0029] Figure 4 A schematic structural diagram of a microwave generator according to an embodiment of the present invention is shown.

[0030] Figure 5 A schematic structural diagram of a material circulation device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0032] To achieve the above object, a microwave vacuum drying device is provided in one embodiment of the present invention, such as Figure 1-5As shown, the device includes a first vacuum tank 11 and a second vacuum tank 12, a first vacuum pipe 13 located on the upper layer for connecting the upper part of the first vacuum tank 11 with the upper part of the second vacuum tank 12, and a second vacuum pipe 14 located on the lower layer for connecting the lower part of the first vacuum tank 11 with the lower part of the second vacuum tank 12. The first vacuum pipe 13 and the second vacuum pipe 14 are arranged in parallel. It can be understood that the first vacuum pipe 13 and the second vacuum pipe 14 can be respectively composed of a plurality of vacuum pipe sections connected in series, so that the user can design the length of the vacuum pipe according to the actual industrial situation. In a specific embodiment, the first vacuum tank 11 is connected and fixed to the first vacuum pipe 13 and the second vacuum pipe 14 respectively through a connecting flange 15, and the second vacuum tank 12 is connected and fixed to the first vacuum pipe 13 and the second vacuum pipe 14 respectively through a connecting flange 15. The inner cavity of the first vacuum pipe 13, the inner cavity of the second vacuum pipe 14, the inner cavity of the first vacuum tank 11 and the inner cavity of the second vacuum tank 12 are connected to form an annular chamber, that is, a closed annular space. The microwave vacuum drying equipment also includes a material circulation device 20 located in the annular chamber. The material circulation device is configured to carry the dried material, which can be, for example, vegetables, fruits or meat. At the same time, the material circulation device can make the material circulate along the annular trajectory of the annular chamber, that is, it can circulate clockwise or counterclockwise along the annular trajectory of the annular chamber. It also includes a plurality of microwave generators 30 arranged on the outer surface of the first vacuum pipe 13 and / or the second vacuum pipe 14. The microwave generator is configured to be used for microwave processing of the material carried on the material circulation device. In a specific embodiment, the microwave generator heats and dries the material in the material circulation device. The microwave vacuum drying equipment also includes a vacuum exhaust device 40, which is configured to exhaust the ambient gas in the annular chamber and discharge the gas in the annular chamber out of the annular chamber.

[0033] When the microwave vacuum drying device is working, first, the material circulation device 20 causes the material to be dried to circulate along the annular trajectory of the annular chamber, and the microwave generator 30 feeds microwaves into the annular chamber to heat and dry the material on the material circulation device. At the same time, the vacuum exhaust device 40 exhausts the ambient gas in the annular chamber so that the annular chamber is kept in a low pressure state. The boiling point of the water in the material on the material circulation device 20 will drop under the low pressure state, so that the low-temperature drying of the material can be achieved, and the nutritional components of the material itself can be maintained. At the same time, the heating characteristics of microwaves from the inside to the outside also cause the material to produce a puffing effect and evaporate water vapor. The water vapor evaporated from the material is discharged to the outside of the annular chamber through the vacuum exhaust device 40. Compared with the microwave vacuum drying device with a cylindrical tank body in the prior art, the microwave vacuum drying device provided by this embodiment can effectively reduce the volume of the device and meet the demand for small-volume microwave vacuum drying devices in current industrial applications; at the same time, the space utilization rate and the microwave processing volume of the device are improved, and the production capacity of the device is improved. This equipment can maintain a small equipment volume while ensuring high space utilization and high production capacity of the equipment. By reducing the pipe diameter, the pipe wall thickness of the equipment is reduced, thereby reducing the difficulty of processing and welding of the equipment, reducing the manufacturing cost of the equipment and the power cost required for the exhaust of the vacuum exhaust device during the operation of the equipment; compared with the microwave drying equipment with a single pipe and a material circulation device in the prior art, the diameter of the vacuum pipe of the equipment can be smaller. In a specific embodiment, the vacuum pipe of the equipment is a standard pipe with a diameter of 600-800mm, while the pipe diameter of the single-pipe microwave drying equipment in the prior art is usually 2-3 meters. It can be seen that compared with the single-pipe microwave drying equipment in the prior art, this equipment can also shorten the diameter of the vacuum pipe, effectively reduce the volume of the equipment, and reduce the manufacturing cost of the equipment; at the same time, the equipment can improve the space utilization and the amount of material processed at one time, and improve the production capacity of the equipment. Moreover, the equipment can expand the action area of ​​materials and microwaves, improve the uniformity of microwave heating, and enhance the effects of microwave processing and steam condensation inside the equipment by means of a material circulation device arranged in the first vacuum pipe and the second vacuum pipe; and the air in the annular chamber or the water vapor evaporated by the materials is timely extracted through the vacuum exhaust device to maintain low humidity in the annular chamber, thereby ensuring that the vacuum degree inside the equipment will not decrease during long-term operation of the microwave drying equipment; furthermore, the first vacuum pipe and the second vacuum pipe can be assembled by a plurality of vacuum pipe segments, and the vacuum pipe segments can be assembled in series according to different industrial environments and operating ranges as required, so that the microwave vacuum drying equipment can be widely used in different industrial environments, thereby improving the application range of the equipment.

[0034] In a specific embodiment, Figure 1As shown, a sealing door 16 for taking in and putting out materials is arranged on one side of the first vacuum tank 11 and / or the second vacuum tank 12, and an observation window 17 for observing the internal conditions of the annular chamber is arranged in the middle of the sealing door 16.

[0035] In a specific embodiment, Figure 1-3 As shown, the device also includes a condensing device, which is configured to condense the ambient gas in the annular chamber, that is, the water vapor evaporated by the material during the microwave heating process is condensed into droplets through the condensing device, and then discharged from the annular chamber after being collected to ensure the vacuum degree in the annular chamber. In a specific embodiment, the condensing device is installed and fixed on the side walls of the first vacuum pipe 13 and the second vacuum pipe 14 in parallel. By setting up the condensing device, the gas in the annular chamber can be further discharged from the annular chamber in time to form droplets, further ensuring that the vacuum degree inside the microwave drying device will not decrease during long-term operation.

[0036] In a further embodiment, the condensing device includes a plurality of condensing tubes 51 arranged on the inner wall of the first vacuum pipe 13 and / or the second vacuum pipe 14 and a chiller (not shown in the figure) connected to the condensing tubes 51 through a pipe, the chiller is located outside the device, and the chiller is configured to provide cold water and circulation power for the condensing tubes. It is understandable that the condensing device also includes a drain pipe 52 arranged at the lower part of the first vacuum pipe 13 and the second vacuum pipe 14. In a specific embodiment, during the operation of the microwave drying equipment, part of the vapor evaporated from the material encounters the condensing tube 51 and is cooled into droplets, flows downward along the inner wall of the first vacuum pipe 13 and / or the second vacuum pipe 14, and is discharged through the drain pipe 52 or from the drain port 18 on the first vacuum tank 11 or the second vacuum tank 12.

[0037] In a specific embodiment, there is an inclination angle between the central axis of the first vacuum pipe 13 and the horizontal plane, and there is an inclination angle between the central axis of the second vacuum pipe 14 and the horizontal plane, that is, the first vacuum pipe 13 and the second vacuum pipe 14 are inclined, so that the water vapor of the material in the microwave drying process forms droplets on the inner wall of the vacuum pipe, or in an embodiment including a condensing device, after being cooled into droplets by the condenser, it can flow downward along the inner wall of the first vacuum pipe 13 or the second vacuum pipe 14, and be discharged from the drain port 18 at the bottom of the first vacuum tank 11 or the second vacuum tank 12, thereby ensuring low humidity in the annular chamber and further improving the vacuum degree in the annular chamber.

[0038] In a Figure 2In the embodiment shown, the height of the end of the first vacuum tank 11 connected to the first vacuum pipe 13 is lower than the height of the end of the second vacuum tank 12 connected to the first vacuum pipe 13; the height of the end of the first vacuum tank 11 connected to the second vacuum pipe 14 is lower than the height of the end of the second vacuum tank 12 connected to the second vacuum pipe 14. Therefore, after the water vapor of the material in the microwave drying process condenses into droplets on the inner wall of the vacuum pipe and the vacuum tank, the droplets flow toward the first vacuum tank 11 along the extension direction of the first vacuum pipe 13 or the second vacuum pipe 14, and finally reach the drain port 18 at the bottom 11 of the first vacuum tank, and are discharged from the drain port 18 to maintain low humidity in the annular chamber. It is understandable that in another embodiment, the height of the end of the first vacuum tank connected to the first vacuum pipe is higher than the height of the end of the second vacuum tank connected to the first vacuum pipe; the height of the end of the first vacuum tank connected to the second vacuum pipe is higher than the height of the end of the second vacuum tank connected to the second vacuum pipe, and the condensed droplets are discharged through the drain port at the bottom of the second vacuum tank.

[0039] In a specific embodiment, to ensure that the material is heated uniformly and continuously in the annular chamber, the number of microwave generators 30 on the outer surface of the first vacuum pipe 13 decreases along the direction from the material input end to the material output end of the first vacuum pipe 13; the number of microwave generators 30 on the outer surface of the second vacuum pipe 14 decreases along the direction from the material input end to the material output end of the second vacuum pipe 14. In the embodiment when the material carrier moves clockwise along the annular track of the annular chamber, the material input end of the first vacuum pipe is the end where the first vacuum pipe is connected to the first vacuum tank, and the material output end of the first vacuum pipe is the end where the first vacuum pipe is connected to the second vacuum tank; the material input end of the second vacuum pipe is the end where the second vacuum pipe is connected to the second vacuum tank, and the material output end of the second vacuum pipe is the end where the second vacuum pipe is connected to the first vacuum tank. It is understandable that when the material carrier moves counterclockwise along the annular track of the annular chamber, the material input end and material output end of the first vacuum pipe and the second vacuum pipe will also change accordingly.

[0040] This embodiment mainly takes into account that when the material moves in the inner cavity of the vacuum tank, there is no microwave generator to heat it, and the temperature of the material drops rapidly. By setting the number of microwave generators on the outer surface of the material input end of the first vacuum pipe to be greater than the number of microwave generators on the outer surface of the material output end of the first vacuum pipe, and setting the number of microwave generators on the outer surface of the material input end of the second vacuum pipe to be greater than the number of microwave generators on the outer surface of the material output end of the second vacuum pipe, the material can be quickly heated as soon as it enters the vacuum pipe. At the same time, the number of microwave generators decreases along the direction of the material movement trajectory, so that the temperature of the material can be maintained within a certain temperature range.

[0041] In a specific embodiment, the microwave generator 30 is disposed around the outer surface of the first vacuum pipe 13 and / or the second vacuum pipe 14. Figure 1-3 As shown, microwave generators 30 are disposed on the upper and lower outer surfaces of the first vacuum duct 13 and the second vacuum duct 14. In a specific embodiment, the microwave generators 30 are arranged at intervals along the circumferential direction of the outer surfaces of the first vacuum duct 13 and the second vacuum duct 14. The equipment of this specific embodiment can heat the material with microwaves from multiple directions at the same time through the synergistic effect of the material circulation device disposed in the first vacuum duct and the second vacuum duct and the microwave generator disposed around the outer surfaces of the first vacuum duct and the second vacuum duct, thereby expanding the action area of ​​the material and the microwave, improving the uniformity of the microwave heating, and further enhancing the effect of the microwave treatment inside the equipment.

[0042] In a specific embodiment, the material circulation device 20 includes two tracks 21 that are oppositely arranged in an annular chamber and a material carrier 22 disposed between the two oppositely arranged tracks 21. In a specific embodiment, the exterior of the two tracks 21 is fixed to the support frame in the first vacuum tank 11, the second vacuum tank 12, the first vacuum pipe 13 and the second vacuum pipe 14. It is understandable that the inner side walls of the two tracks 21 are provided with a moving part, and the moving part can drive the material carrier 22 to circulate along the extension direction of the track 21. Among them, in one embodiment, the moving part is a chain 23. Among them, the exterior of the two tracks is made of stainless steel that can provide sufficient rigidity, and the inner lining is ultra-high molecular polyethylene, which can reduce the friction between the track and the chain. The chain 23 is fixedly combined with the material carrier 22. It is understandable that the material carrier can be driven to circulate along the annular track of the track by a motor, a sprocket drive or other commonly used methods in the art. In such as Figure 3-5 In the embodiment shown, the material circulation device 20 includes a rotating shaft 24 disposed between two oppositely disposed rails 21 and a gear 25 located on the rotating shaft 24 and matched with the chain 23. The rotating shaft 24 is connected to an external motor (not shown in the figure), and the rotating shaft 24 and the gear 25 are driven to rotate by the external motor. The gear 25 is matched with the chain 22, thereby driving the chain 22 to move. In another optional embodiment, a tensioner 26 disposed near the gear 25 is also included, and the tensioner can be used to tension the chain.

[0043] In a specific embodiment, the vacuum exhaust device 40 includes a vacuum pump 41 and a buffer tank 42; the vacuum pump 41 is connected to the vacuum flanges 19 on the first vacuum pipeline 13 and the second vacuum pipeline 14 through an exhaust pipeline 43, and the buffer tank 42 is located on the exhaust pipeline 43. It is understandable that the vacuum exhaust device 40 also includes a water tank 44 connected to the vacuum pump 41. Figure 1-2As shown, one end of the buffer tank 42 is connected to the vacuum pump 41, and the other end of the buffer tank 42 is connected to the exhaust pipe 43. The buffer tank can store a certain vacuum pressure on the one hand, and can prevent the water in the vacuum pump from being sucked back into the vacuum pipe in the event of an unexpected failure on the other hand. In a specific embodiment, a solenoid valve 45 is provided on the exhaust pipe 43, and the solenoid valve is used to control the gas connection between the exhaust pipe and the external air. Considering the heating temperature of vegetables and fruits and the required vacuum degree, in an optional embodiment, the vacuum pump is a water ring vacuum pump.

[0044] In a specific embodiment, the equipment also includes a monitoring lighting device, which includes a lighting lamp 60 that can be used to provide lighting inside the equipment. The lighting lamp 60 is arranged on the top surface of the first vacuum tank 11 or the second vacuum tank 12, and a plurality of sensors 70 that can be used to monitor the temperature of the material in the equipment, the vacuum degree and the humidity in the annular chamber in real time. The plurality of sensors may be, for example, infrared temperature sensors, humidity sensors, etc. It is understandable that the monitoring lighting device may also include a camera.

[0045] In a specific embodiment, Figure 4 As shown, the microwave generator 30 includes a magnetron 31 and an excitation cavity 32 connected to the magnetron 31 at one end, and the other end of the excitation cavity 32 is connected and fixed to the microwave source mounting flange 110 corresponding to the first vacuum pipe 13 and / or the second vacuum pipe 14 through the mounting cover plate 33; it is understandable that the microwave generator 30 also includes a switching power supply (not shown in the figure) for providing high voltage electricity to the magnetron 31 so that the magnetron 31 generates microwaves, and a sealing sheet (not shown in the figure) arranged between the mounting cover plate 33 and the microwave source mounting flange 110 of the vacuum pipe, and the microwave generated by the magnetron 31 is fed into the inner cavity of the first vacuum pipe 13 and / or the inner cavity of the second vacuum pipe 14 through the excitation cavity 32. During installation, the sealing sheet is firstly restricted in the groove of the microwave source mounting flange 110 of the vacuum pipe by using the mounting cover plate 33, and then the excitation cavity 32 is fixed on the mounting cover plate 33, and finally the magnetron 31 is fixed on the excitation cavity 32 by bolts.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A microwave vacuum drying device, characterized in that: The device comprises: First vacuum tank; Second vacuum tank; A first vacuum pipe located at the upper layer for connecting the upper part of the first vacuum tank to the upper part of the second vacuum tank; and A second vacuum pipe located at the lower layer for connecting the lower part of the first vacuum tank to the lower part of the second vacuum tank; the first vacuum pipe and the second vacuum pipe are arranged in parallel; The inner cavity of the first vacuum pipe, the inner cavity of the second vacuum pipe, the inner cavity of the first vacuum tank and the inner cavity of the second vacuum tank are connected to form an annular chamber; The device also includes: A material-carrying circulation device located in the annular chamber, wherein the material-carrying circulation device is configured to carry the material to be dried and to cause the material to circulate along an annular trajectory of the annular chamber; A plurality of microwave generators disposed on the outer surface of the first vacuum pipe and / or the second vacuum pipe, wherein the microwave generators are configured to process the materials carried by the material circulation device with microwaves; A vacuum exhaust device, the vacuum exhaust device being configured to exhaust the ambient gas in the annular chamber; Along the direction from the material input end to the material output end of the first vacuum pipeline, the number of microwave generators on the outer surface of the first vacuum pipeline decreases; Along the direction from the material input end to the material output end of the second vacuum pipeline, the number of microwave generators on the outer surface of the second vacuum pipeline decreases; The microwave generator is arranged around the outer surface of the first vacuum pipe and / or the second vacuum pipe.

2. The microwave vacuum drying equipment according to claim 1, characterized in that: The apparatus comprises a condensing device configured for condensing ambient gas within the annular chamber.

3. The microwave vacuum drying equipment according to claim 1, characterized in that: There is an inclination angle between the central axis of the first vacuum pipe and the horizontal plane; There is an inclination angle between the central axis of the second vacuum pipe and the horizontal plane.

4. The microwave vacuum drying equipment according to claim 1, characterized in that: The height of the end portion of the first vacuum tank connected to the first vacuum pipeline is lower than the height of the end portion of the second vacuum tank connected to the first vacuum pipeline; The height of the end portion of the first vacuum tank connected to the second vacuum pipeline is lower than the height of the end portion of the second vacuum tank connected to the second vacuum pipeline.

5. The microwave vacuum drying equipment according to claim 1, characterized in that: The material loading circulation device comprises two tracks which are arranged opposite to each other and are located in the annular chamber, and a material loading tray which is arranged between the two tracks which are arranged opposite to each other.

6. The microwave vacuum drying equipment according to claim 1, characterized in that: The vacuum exhaust device includes a vacuum pump and a buffer tank; The vacuum pump is communicated with the first vacuum pipeline and the second vacuum pipeline respectively through an exhaust pipeline, and the buffer tank is located on the exhaust pipeline.

7. The microwave vacuum drying equipment according to claim 2, characterized in that: The condensing device includes a plurality of condensing tubes arranged on the inner wall of the first vacuum pipe and / or the second vacuum pipe and a water chiller connected to the condensing tubes, and the water chiller is configured to provide cold water and circulation power for the condensing tubes.

8. The microwave vacuum drying equipment according to claim 1, characterized in that: The device comprises a monitoring lighting device, which comprises a lighting lamp for providing lighting inside the device and a plurality of sensors for real-time monitoring of the temperature of the material in the device, the vacuum degree and the humidity in the annular chamber.

9. The microwave vacuum drying equipment according to claim 1, characterized in that: The microwave generator comprises a magnetron and an excitation cavity having one end connected to the magnetron, and the other end of the excitation cavity is connected and fixed to the first vacuum pipe and / or the second vacuum pipe; The microwaves generated by the magnetron are fed into the inner cavity of the first vacuum pipe and / or the inner cavity of the second vacuum pipe through the excitation cavity.

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