阅读说明：本技术 一种微波真空干燥设备 (Microwave vacuum drying equipment ) 是由 王顺 张杨林子 甄洁 袁月 王梓珊 赵小萱 于 2020-05-15 设计创作，主要内容包括：本发明实施例涉及一种微波真空干燥设备,包括第一弧形管道；第二弧形管道；将第一弧形管道的一端和第二弧形管道的一端连通的第一真空管道；将第一弧形管道的另一端和第二弧形管道的另一端连通的第二真空管道；第一真空管道的内腔、第二真空管道的内腔、第一弧形管道的内腔以及第二弧形管道的内腔连通形成一环形腔室；还包括载料循环装置,可承载被干燥物料并使物料沿环形腔室的环形轨迹循环运动；若干个设置在至少一个管道的外表面上的微波发生器,用于微波处理物料；真空排气装置,用于对环境气体进行排气。该设备可有效减小管道直径,降低加工制造难度和成本,同时改善微波加热均匀性,并提高设备的内部空间利用率和产能。(The embodiment of the invention relates to microwave vacuum drying equipment, which comprises a first arc-shaped pipeline; a second arcuate duct; a first vacuum pipe connecting one end of the first arc pipe and one end of the second arc pipe; a second vacuum pipe connecting the other end of the first arc pipe and the other end of the second arc pipe; the inner cavity of the first vacuum pipeline, the inner cavity of the second vacuum pipeline, the inner cavity of the first arc-shaped pipeline and the inner cavity of the second arc-shaped pipeline are communicated to form an annular chamber; the drying device also comprises a material carrying circulating device which can carry the dried material and make the material circularly move along the annular track of the annular chamber; a plurality of microwave generators disposed on an outer surface of the at least one conduit for microwave treatment of the material; and the vacuum exhaust device is used for exhausting the environmental gas. The equipment can effectively reduce the diameter of the pipeline, reduce the processing and manufacturing difficulty and cost, improve the uniformity of microwave heating, and improve the utilization rate and the capacity of the internal space of the equipment.)

1. A microwave vacuum drying apparatus, characterized in that the apparatus comprises:

a first arcuate conduit;

a second arcuate duct;

the first vacuum pipeline is positioned on one side and used for communicating one end of the first arc-shaped pipeline with one end of the second arc-shaped pipeline; and

the second vacuum pipeline is positioned on the other side and is used for communicating the other end of the first arc-shaped pipeline with the other end of the second arc-shaped pipeline; the first vacuum pipeline and the second vacuum pipeline are arranged in parallel;

the inner cavity of the first vacuum pipeline, the inner cavity of the second vacuum pipeline, the inner cavity of the first arc-shaped pipeline and the inner cavity of the second arc-shaped pipeline are communicated to form an annular chamber;

the apparatus further comprises:

the material loading circulating device is positioned in the annular chamber and is configured to load the dried materials and enable the materials to circularly move along the annular track of the annular chamber;

a plurality of microwave generators arranged on the outer surface of at least one of the first arc-shaped pipe, the first vacuum pipe, the second arc-shaped pipe and the second vacuum pipe, wherein the microwave generators are configured to be used for microwave treatment of materials carried on the material carrying circulation device;

a vacuum exhaust configured to exhaust ambient gas within the annular chamber.

2. Microwave vacuum drying apparatus according to claim 1,

the apparatus comprises condensing means configured to condense ambient gas within the annular chamber.

3. Microwave vacuum drying apparatus according to claim 1,

the vacuum exhaust device is arranged between the first vacuum pipeline and the second vacuum pipeline.

4. Microwave vacuum drying apparatus according to claim 1,

an inclined angle is formed between the central axis of the first vacuum pipeline and the horizontal plane;

an inclined angle exists between the central axis of the second vacuum pipeline and the horizontal plane.

5. A microwave vacuum drying apparatus according to claim 1, wherein a microwave generator is provided around an outer surface of at least one of the first arcuate duct, the first vacuum duct, the second arcuate duct and the second vacuum duct.

6. The microwave vacuum drying apparatus according to claim 1, wherein the carrier circulation device comprises a conveyor belt located in the annular chamber, a transmission shaft located in the conveyor belt, and a carrier tray disposed on the conveyor belt;

the material carrying disc can circularly move along the extending direction of the conveying belt through the rotation of the transmission shaft.

7. A microwave vacuum drying apparatus according to claim 6 further comprising a shaft seal arrangement provided on the drive shaft,

the shaft sealing device is configured to hermetically seal a shaft end portion of the transmission shaft.

8. The microwave vacuum drying apparatus according to claim 1, wherein the vacuum exhaust device comprises a vacuum pump, a buffer tank;

the vacuum pump is respectively communicated with the first vacuum pipeline and the second vacuum pipeline through exhaust pipelines, and the buffer tank is positioned on the exhaust pipelines.

9. The microwave vacuum drying equipment as claimed in claim 2, wherein the condensing device comprises a plurality of condensing pipes arranged on the inner wall of the first vacuum pipeline and/or the second vacuum pipeline and a water chiller communicated with the condensing pipes, and the water chiller is configured to provide cold water and circulating power for the condensing pipes.

10. A microwave vacuum drying apparatus according to claim 1, wherein the apparatus includes a monitoring illumination device, the monitoring illumination device including an illumination lamp for illuminating the interior of the apparatus and a plurality of sensors for real-time monitoring of the temperature of the material in the apparatus, the vacuum level and the humidity in the annular chamber.

11. Microwave vacuum drying apparatus according to claim 1,

the microwave generator comprises a magnetron and an excitation cavity, one end of the excitation cavity is communicated with the magnetron, and the other end of the excitation cavity is fixedly connected with at least one of the first arc-shaped pipeline, the first vacuum pipeline, the second arc-shaped pipeline and the second vacuum pipeline;

and the microwave generated by the magnetron is fed into the inner cavity of at least one of the first arc-shaped pipeline, the first vacuum pipeline, the second arc-shaped pipeline and the second vacuum pipeline through the excitation cavity.

Technical Field

The invention relates to the technical field of microwave vacuum. And more particularly, to a microwave vacuum drying apparatus.

Background

Microwave refers to electromagnetic wave with frequency in the range of 300 MHz-300 GHz, and is used in military radar and communication field at first; it was found that the irradiation of polar substances with microwave radiation produces a thermal effect which rapidly raises the temperature of the irradiated material, and according to the characteristic of microwave, the drying is widely performed by using a microwave vacuum drying apparatus.

Disclosure of Invention

The invention aims to provide microwave vacuum drying equipment which has high yield, high internal space utilization rate, stable internal vacuum degree and low processing and manufacturing difficulty and is convenient for large-scale production.

To solve at least one of the above problems, there is provided a microwave vacuum drying apparatus including a first arc-shaped duct; a second arcuate duct; the first vacuum pipeline is positioned on one side and used for communicating one end of the first arc-shaped pipeline with one end of the second arc-shaped pipeline; the second vacuum pipeline is positioned on the other side and is used for communicating the other end of the first arc-shaped pipeline with the other end of the second arc-shaped pipeline; the first vacuum pipeline and the second vacuum pipeline are arranged in parallel; the inner cavity of the first vacuum pipeline, the inner cavity of the second vacuum pipeline, the inner cavity of the first arc-shaped pipeline and the inner cavity of the second arc-shaped pipeline are communicated to form an annular chamber; the equipment also comprises a material loading circulating device positioned in the annular chamber, wherein the material loading circulating device is configured to load the dried material and make the material circularly move along the annular track of the annular chamber; a plurality of microwave generators arranged on the outer surface of at least one of the first arc-shaped pipe, the first vacuum pipe, the second arc-shaped pipe and the second vacuum pipe, wherein the microwave generators are configured to be used for microwave treatment of materials carried on the material carrying circulation device; a vacuum exhaust configured to exhaust ambient gas within the annular chamber;

optionally, the apparatus comprises a condensing device configured to condense ambient gas within the annular chamber.

Optionally, the vacuum exhaust is disposed between the first vacuum conduit and the second vacuum conduit.

Optionally, an inclined angle exists between the central axis of the first vacuum pipeline and the horizontal plane; an inclined angle exists between the central axis of the second vacuum pipeline and the horizontal plane.

Optionally, a microwave generator is disposed around an outer surface of at least one of the first arcuate tube, the first vacuum tube, the second arcuate tube, and the second vacuum tube.

Optionally, the material loading circulating device comprises a conveying belt located in the annular chamber, a transmission shaft located in the conveying belt, and a material loading disc arranged on the conveying belt;

the material carrying disc can circularly move along the extending direction of the conveying belt through the rotation of the transmission shaft.

Optionally, the device further comprises a shaft sealing device arranged on the transmission shaft,

the shaft sealing device is configured to hermetically seal a shaft end portion of the transmission shaft.

Optionally, the vacuum exhaust device comprises a vacuum pump and a buffer tank;

the vacuum pump is respectively communicated with the first vacuum pipeline and the second vacuum pipeline through exhaust pipelines, and the buffer tank is positioned on the exhaust pipelines.

Optionally, the condensing device includes a plurality of condenser pipes disposed on an inner wall of the first vacuum pipe and/or the second vacuum pipe, and a water chiller in communication with the condenser pipes, the water chiller being configured to provide chilled water and circulating power for the condenser pipes.

Optionally, the apparatus includes a monitoring illumination device, and the monitoring illumination device includes an illumination lamp for providing illumination to the inside of the apparatus and a plurality of sensors for monitoring the temperature of the material in the apparatus and the vacuum degree and humidity in the annular chamber in real time.

Optionally, the microwave generator includes a magnetron and an excitation cavity having one end communicated with the magnetron, and the other end of the excitation cavity is fixedly connected to at least one of the first arc-shaped pipe, the first vacuum pipe, the second arc-shaped pipe and the second vacuum pipe;

and the microwave generated by the magnetron is fed into the inner cavity of at least one of the first arc-shaped pipeline, the first vacuum pipeline, the second arc-shaped pipeline and the second vacuum pipeline through the excitation cavity.

The invention has the following beneficial effects:

the microwave vacuum drying equipment provided by the invention can effectively reduce the diameter and the wall thickness of the pipeline, reduce the processing and manufacturing difficulty and the manufacturing cost of the equipment, simultaneously improve the utilization rate and the capacity of the internal space of the equipment, and enhance the effects of microwave treatment and steam condensation in the equipment; but also can ensure that the vacuum degree in the microwave drying equipment is not reduced in the long-time operation process; moreover, the first vacuum pipeline and the second vacuum pipeline can be assembled by connecting a plurality of vacuum pipeline sections in series, so that the microwave vacuum drying equipment can be applied to different industrial environments in a large scale, and the application range of the equipment is widened.

In addition, the equipment can simultaneously carry out microwave heating on the materials from multiple directions through the material carrying circulating device arranged in the annular cavity and the microwave generator arranged around the outer surface of at least one of the first arc-shaped pipeline, the first vacuum pipeline, the second arc-shaped pipeline and the second vacuum pipeline, so that the action area of the materials and microwaves is enlarged, the microwave treatment effect in the equipment is further enhanced, meanwhile, the temperature of the materials in the annular cavity is always maintained within a certain temperature range, the long-time low-temperature drying of the materials is realized, and the nutrient components of the materials are kept.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 shows a structural side view of a microwave vacuum drying apparatus according to an embodiment of the present invention.

Fig. 2 shows a structural plan view of a microwave vacuum drying apparatus according to an embodiment of the present invention.

Fig. 3 shows a schematic configuration diagram of a vacuum exhaust apparatus according to an embodiment of the present invention.

Fig. 4 shows a schematic view of the internal structure of a vacuum pipe according to an embodiment of the present invention.

Fig. 5 shows a schematic structural diagram of a material loading circulation device according to an embodiment of the invention.

Fig. 6 shows a schematic structural view of a shaft sealing device according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

In order to achieve the above objects, in one embodiment of the present invention, there is provided a microwave vacuum drying apparatus, as shown in fig. 1 to 6, comprising a first arc-shaped duct 10 and a second arc-shaped duct 11, and further comprising a first vacuum duct 12 at one side for communicating one end of the first arc-shaped duct 10 with one end of the second arc-shaped duct 11; and a second vacuum pipe 13 at the other side for communicating the other end of the first arc pipe 10 with the other end of the second arc pipe 11. The first vacuum pipeline 12 and the second vacuum pipeline 13 are arranged in parallel, and it can be understood that the first vacuum pipeline and the second vacuum pipeline can be respectively formed by connecting a plurality of vacuum pipeline sections in series, so that a user can design the length of the vacuum pipeline according to actual industrial conditions, and in addition, the first arc-shaped pipeline 10 and the second arc-shaped pipeline 11 can be positioned at the same height or different heights. In a specific embodiment, the first arc-shaped pipe 10 is fixedly connected with the first vacuum pipe 12 and the second vacuum pipe 13 through the connecting flange 14, and the second arc-shaped pipe 11 is fixedly connected with the first vacuum pipe 12 and the second vacuum pipe 13 through the connecting flange 14. The inner cavity of the first vacuum pipeline, the inner cavity of the second vacuum pipeline, the inner cavity of the first arc-shaped pipeline and the inner cavity of the second arc-shaped pipeline are communicated to form an annular chamber together, and therefore a closed annular space is formed. The microwave vacuum drying apparatus further comprises a material carrying circulation device 20 located in the annular chamber, the material carrying circulation device being configured to carry the material to be dried, such as vegetables, fruits or meats, and circulate the material along the circular path of the annular chamber, i.e. along the circular path of the annular chamber in a clockwise or counterclockwise direction. The apparatus further comprises a plurality of microwave generators 30 disposed on an outer surface of at least one of the first arcuate duct 10, the first vacuum duct 12, the second arcuate duct 11, and the second vacuum duct 13, the microwave generators being configured for microwave treatment of material carried on the load circulation device. In a specific embodiment, the microwave generator heats and dries the material in the material loading circulation device. The microwave vacuum drying apparatus further comprises a vacuum exhaust 40 configured to exhaust ambient gas from the annular chamber and to exhaust gas from the annular chamber.

When the microwave vacuum drying equipment works, firstly, the material loading circulating device 20 circularly moves the loaded material to be dried along the circular track of the annular chamber, and the microwave generator 30 feeds microwaves into the annular chamber to heat and dry the material on the material loading circulating device 20. At the same time, the vacuum exhaust device 40 exhausts the ambient gas in the annular chamber, so that the annular chamber is in a low pressure state. The boiling temperature of the water in the material on the material-carrying circulation device 20 is reduced under the low-pressure state, so that the low-temperature drying of the material can be realized, the nutrient content of the material is kept, and meanwhile, the microwave heating characteristic from inside to outside also enables the material to generate the puffing effect, and water vapor is evaporated. And the water vapor evaporated from the material is exhausted to the outside of the annular chamber through the vacuum exhaust device 40.

Compared with the microwave vacuum drying equipment of the cylindrical tank body in the prior art, the microwave vacuum drying equipment provided by the embodiment has the advantages that the diameter and the wall thickness of the tank body are effectively reduced, the processing and manufacturing difficulty and cost are reduced, and the requirements of low-cost and small-volume microwave vacuum drying equipment in the current industrial application are met; meanwhile, the utilization rate of the internal space of the equipment and the one-time microwave processing capacity are improved, and the capacity of the equipment is improved. Therefore, the equipment can ensure high internal space utilization rate and high yield of the equipment, simultaneously can keep smaller equipment volume, and simultaneously can reduce the design wall thickness of the tank body by reducing the diameter of the tank body, thereby reducing the processing and welding difficulty of the equipment, and reducing the manufacturing cost of the equipment and the power cost required by the exhaust of the vacuum exhaust device in the operation process; compared with the microwave drying equipment with a single tank body and a material carrying device which circulates around the circumference of a horizontal shaft in the prior art, the diameter of the vacuum tank body of the equipment is smaller, in a specific implementation mode, the vacuum tank body of the equipment is a standard pipeline, the diameter is 600-800mm, and the diameter of the microwave drying equipment with the single tank body in the prior art is usually 2-3 m, so that the equipment can also effectively reduce the volume of the equipment, reduce the design wall thickness of the tank body and reduce the manufacturing cost of the equipment compared with the microwave drying equipment with the single tank body in the prior art; meanwhile, the equipment can improve the utilization rate of the internal space of the equipment and the primary microwave treatment capacity, and improve the productivity of the equipment. The equipment enlarges the action area of materials and microwaves through the material carrying circulating devices arranged in the first vacuum pipeline and the second vacuum pipeline, and can enhance the microwave treatment and steam condensation effects in the equipment; the vacuum exhaust device is used for exhausting the vapor evaporated from the gas or the material in the annular chamber out of the annular chamber in time, so that the low humidity in the annular chamber is kept, and the vacuum degree in the microwave drying equipment can be ensured not to be reduced in the long-time operation process; furthermore, first vacuum pipeline and second vacuum pipeline accessible a plurality of vacuum pipeline sections equipment form, can be according to different industrial environment and operation interval, carry out the series connection equipment to the vacuum pipeline section as required for this microwave drying equipment can be applied to different industrial environment on a large scale, improves the range of application of this equipment.

In a specific embodiment, one side of the first arc-shaped pipeline 10 and/or the second arc-shaped pipeline 11 is provided with a sealing door 15 for taking and placing materials, and the middle of the sealing door 15 is provided with an observation window 16 for observing the internal condition of the annular chamber. In addition, in another alternative embodiment, the vacuum exhaust device 40 is disposed between the first vacuum pipe 12 and the second vacuum pipe 13, so that the overall floor area of the microwave drying equipment can be further reduced.

In a specific embodiment, as shown in fig. 1 to 3, the apparatus further comprises a condensing device configured to condense ambient gas in the annular chamber, i.e., water vapor evaporated from the material during the microwave drying process is condensed into droplets by the condensing device and discharged out of the annular chamber after being collected, so as to maintain the vacuum degree in the annular chamber. In a specific embodiment, the condensing units 50 are installed and fixed on both side walls of the first vacuum duct 12 and the second vacuum duct 13 in parallel. Through setting up condensing equipment, can further form the liquid drop in time and discharge annular chamber with the environmental gas in the annular chamber, further ensure that this microwave drying equipment can not descend at the inside vacuum of long-time operation in-process equipment.

In a specific embodiment, the condensing device 50 includes a plurality of condensing pipes 51 disposed on an inner wall of the first vacuum pipe 12 and/or the second vacuum pipe 13, and a water chiller (not shown) connected to the condensing pipes 51 through a cold water inlet 52 and a cold water outlet 53, the water chiller being located outside the apparatus and configured to provide cold water and circulation power for the condensing pipes. It can be understood that the condensing unit 50 further includes a condensed water outlet 54 disposed at a lower portion of the first vacuum pipe 12 and the second vacuum pipe 13. In a specific embodiment, during the operation of the microwave drying device, part of the steam evaporated from the material meets the condensation pipe 51 and is cooled into droplets, flows downwards along the inner wall of the first vacuum pipe 12 and/or the second vacuum pipe 13, and is discharged through the condensed water outlet 54.

In a specific embodiment, an inclination angle exists between the central axis of the first vacuum pipeline 12 and the horizontal plane, and an inclination angle exists between the central axis of the second vacuum pipeline 13 and the horizontal plane, that is, the first arc-shaped pipeline 10 and the second arc-shaped pipeline 11 are located at different heights, and the first vacuum pipeline 12 and the second vacuum pipeline 13 are inclined, so that after water vapor of the material in the microwave drying process forms droplets on the inner side wall of the vacuum pipeline or the arc-shaped pipeline, or in an embodiment including a condensing device, after the material is cooled into droplets by a condensing pipe, the droplets can flow downwards along the inner wall of the first vacuum pipeline 12 or the second vacuum pipeline 13 and are discharged from a liquid discharge port on the equipment, thereby ensuring low humidity in the annular cavity and further ensuring the vacuum degree in the annular cavity. In a specific embodiment, the end of the first curved pipe 10 connected to the first vacuum pipe 12 has a lower height than the end of the second curved pipe 11 connected to the first vacuum pipe 12; the height of the end of the first curved duct 10 connected to the second vacuum duct 13 is lower than the height of the end of the second curved duct 11 connected to the second vacuum duct 13. Therefore, the liquid drops can flow along the extending direction of the first vacuum pipeline 12 or the second vacuum pipeline 13 and are finally discharged from the liquid discharge port of the first vacuum pipeline 12 or the second vacuum pipeline 13, so that condensed water is prevented from staying in the annular chamber, and the humidity in the annular chamber is kept low. It will be appreciated that in another embodiment, the end of the first arcuate conduit connected to the first vacuum conduit is at a higher elevation than the end of the second arcuate conduit connected to the first vacuum conduit; the height of the end part of the first arc-shaped pipe connected with the second vacuum pipe is higher than that of the end part of the second arc-shaped pipe connected with the second vacuum pipe, namely the height of the first arc-shaped pipe is higher than that of the second arc-shaped pipe.

In a specific embodiment, the microwave generator 30 is disposed around the outer surface of at least one of the first arc-shaped pipe 10, the first vacuum pipe 12, the second arc-shaped pipe 11 and the second vacuum pipe 13, and as shown in fig. 1 to 4, the microwave generator 30 is disposed on the outer surfaces of the upper and lower sides of the first arc-shaped pipe 10, the first vacuum pipe 11, the second arc-shaped pipe 11 and the second vacuum pipe 12 through flanges. In a specific embodiment, the microwave generators 30 are arranged at intervals in a circumferential direction of the outer surfaces of the first arc pipe 10, the first vacuum pipe 12, the second arc pipe 11, and the second vacuum pipe 12. This embodiment's equipment is through setting up the material circulating device that carries in first vacuum pipeline and second vacuum pipeline and encircle first arc pipeline, first vacuum pipeline, the microwave generator's of the surface setting of second arc pipeline and second vacuum pipeline synergism, both can carry out microwave heating to the material simultaneously from a plurality of directions, enlarge the area of action of material and microwave, improve microwave heating's homogeneity, further strengthen the inside microwave treatment's of equipment effect, make the indoor material's of annular chamber temperature maintain at certain temperature range all the time simultaneously, realize the long-time low temperature drying of material, keep the nutrient composition of material.

In a specific embodiment, as shown in fig. 4-5, the material loading circulating device 20 comprises a conveying belt 21 positioned in the annular chamber, a transmission shaft 22 positioned in the conveying belt 21, and a material loading tray 23 arranged on the conveying belt 21; the material loading tray 23 can move circularly along the extending direction of the conveying belt 21 by the rotation of the transmission shaft 22. Specifically, as shown in the embodiment of fig. 4-5, the conveyor belt 21 includes a turning conveyor belt 211 and a straight tube conveyor belt 212, the turning conveyor belt 211 and the straight tube conveyor belt 212 contact each other, the transmission shaft 22 includes a turning transmission shaft 221 and a straight tube transmission shaft 222, the turning transmission shaft 221 is fixed at each end of the turning conveyor belt 211, and the straight tube transmission shafts 222 are arranged at each end of the straight tube conveyor belt 212. It can be understood that the material loading circulating device 20 further includes a gear 24 mounted on the turning transmission shaft 221 or the straight transmission shaft 222, and the turning transmission shaft 221 or the straight transmission shaft 222 is driven by the gear 24, so that the material loading tray 23 performs a circulating motion on the turning conveying belt 211 or the straight conveying belt 212. In another specific embodiment, the material loading and circulating device 20 further includes a rolling support shaft 223 disposed inside the straight tube conveyor belt 212 for supporting. It will be appreciated that instead of the movement shown in the embodiments of fig. 4-5, the material-carrying tray may be driven by a motor or a chain wheel drive or other means commonly used in the art to circulate the material-carrying tray in the direction of the extension of the conveyor belt.

In a particular embodiment, the apparatus further comprises a shaft sealing device 60 disposed on said drive shaft 22, said shaft sealing device being configured for hermetically sealing a shaft end of said drive shaft. As shown in fig. 1, 2 and 6, the shaft sealing device 60 may be respectively disposed between the end portions of the turning transmission shaft 221, the straight transmission shaft 222 or the rolling support shaft 223 and the gear 24, and the shaft sealing device 60 specifically includes an oil seal 61 for sealing the circumferential direction of the transmission shaft, an O-ring 62 for sealing the radial direction of the transmission shaft, a mounting sleeve 63 for fixing the oil seal 61 and the O-ring 62, and a bearing 64 and a lock nut 65 for fixing the end portion of the transmission shaft 22.

In a specific embodiment, the vacuum exhaust device 40 includes a vacuum pump 41, a buffer tank 42; the vacuum pump 41 is respectively communicated with the vacuum flanges 17 on the first vacuum pipeline 12 and the second vacuum pipeline 13 through an exhaust pipeline 43, the buffer tank 42 is positioned on the exhaust pipeline 43, it can be understood that the vacuum exhaust device 40 further comprises a water tank 44 connected with the vacuum pump 41, as shown in fig. 1-2, one end of the buffer tank 42 is communicated with the vacuum pump 41, the other end of the buffer tank 42 is communicated with the exhaust pipeline 43, and the buffer tank can store certain vacuum pressure on one hand, and on the other hand, can prevent water in the vacuum pump from being sucked back into the vacuum pipeline in case of unexpected failure. In a specific embodiment, the exhaust duct 43 is provided with a first electromagnetic valve 45, a second electromagnetic valve 46 and a release valve 47, the first electromagnetic valve 45 is used for controlling the gas connection and disconnection between the exhaust duct and the outside air, the second battery valve 46 and the release valve 47 are used for the release and pressure release of the vacuum exhaust device, and the vacuum pump 41 is a water ring vacuum pump in an optional embodiment in consideration of the heating temperature of the vegetables and fruits and the required vacuum degree.

In a specific embodiment, the apparatus includes a monitoring illumination device, the monitoring illumination device includes an illumination lamp 71 for illuminating the inside of the apparatus, the illumination lamp 71 may be disposed on the top surfaces of the first arc-shaped pipe 10, the first vacuum pipe 12, the second arc-shaped pipe 11 and the second vacuum pipe 13, and a plurality of sensors for real-time monitoring of the temperature of the material in the apparatus, the vacuum degree and the humidity in the annular chamber, such as an infrared temperature sensor 72, a humidity sensor 73, a pressure sensor 74, etc., it is understood that the monitoring illumination device may further include a camera 75.

In a specific embodiment, the microwave generator 30 includes a magnetron 31 and an excitation cavity 32 having one end communicating with the magnetron 31, and the other end of the excitation cavity 32 is connected and fixed to a microwave source mounting flange 18 corresponding to at least one of the first arc-shaped pipe 10, the first vacuum pipe 12, the second arc-shaped pipe 11, and the second vacuum pipe 12 through a mounting cover 33; it can be understood that the microwave generator 30 further includes a switching power supply (not shown) for providing a high voltage to the magnetron 31 so that the magnetron 31 generates microwaves, and a sealing plate (not shown) disposed between the mounting cover 33 and the microwave source mounting flange 18 of the vacuum pipe, and the microwaves generated by the magnetron 31 are fed into the inner cavity of the first arc-shaped pipe 10, the first vacuum pipe 12, the second arc-shaped pipe 11 or the second vacuum pipe 13 through the excitation cavity 32. When the microwave source is installed, the sealing sheet is firstly limited in the groove of the microwave source installation flange 18 of the vacuum pipeline or the arc pipeline by using the installation cover 33 plate, then the excitation cavity 32 is fixed on the installation cover plate 33, and finally the magnetron 31 is fixed on the excitation cavity 32 through bolts.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.