CN111457700A

CN111457700A - Microwave vacuum drying equipment

Info

Publication number: CN111457700A
Application number: CN202010258781.XA
Authority: CN
Inventors: 王顺; 杨明华; 周明干; 李瑶; 毕广龙; 甄洁
Original assignee: No 12 Research Institute Of Cetc
Current assignee: No 12 Research Institute Of Cetc
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2020-07-28

Abstract

The invention relates to microwave vacuum drying equipment, which comprises a shell, a drying chamber and a drying chamber, wherein an accommodating cavity is formed inside the shell; the material carrying and rotating device is positioned in the accommodating cavity and comprises a rotating shaft and at least one layer of bearing disc which is arranged around the rotating shaft and can be used for bearing the dried material, and the rotating shaft can drive the bearing disc to rotate around the axis of the rotating shaft; the microwave generators are positioned on the outer surface of the shell and at least comprise wave guide tubes which penetrate through the shell and extend into the accommodating cavity along the radial direction of the rotating shaft, and the wave guide tubes are positioned at corresponding positions above the materials on the bearing disc; the microwave generator is configured for microwave processing of the material on the carrier platter; a vacuum exhaust configured to exhaust ambient gas within the receiving cavity. The equipment can effectively reduce the floor area of the equipment, improve the space utilization rate and the capacity of the equipment, and meanwhile, the microwave generator is positioned on the outer surface of the shell, so that the equipment is convenient to overhaul and replace.

Description

Microwave vacuum drying equipment

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; later, it was found that the object is irradiated with microwave radiation to generate thermal effect, so that the temperature of the irradiated object is rapidly raised, and according to the characteristic of microwave, the microwave vacuum drying equipment is widely used for drying.

The microwave vacuum drying equipment in the prior art mostly adopts the horizontal placement of the cylindrical tank body, the tank body is internally provided with a central shaft and a material tray positioned on the central shaft, and the material tray is driven to do uniform circular motion through the rotation of the central shaft. However, the microwave vacuum drying equipment with the structure has the advantages of low space utilization rate and large occupied area, thereby improving the construction cost of a factory building.

Therefore, in order to overcome the defects of the prior art, a novel microwave vacuum drying device needs to be provided.

Disclosure of Invention

The invention aims to provide microwave vacuum drying equipment which has high equipment capacity, high space utilization rate and small floor area.

In order to achieve the above object, there is provided a microwave vacuum drying apparatus including a housing having an accommodating chamber formed therein; the material loading and rotating device is positioned in the accommodating cavity and comprises a rotating shaft and at least one layer of bearing disc which is arranged around the rotating shaft and can be used for bearing the dried material, and the rotating shaft can drive the bearing disc to rotate around the axis of the rotating shaft; the device also comprises a plurality of microwave generators positioned on the outer surface of the shell, wherein each microwave generator at least comprises a waveguide tube which penetrates through the shell and extends into the containing cavity along the radial direction of the rotating shaft, and the waveguide tube is positioned at a corresponding position above the material on the bearing disc; the microwave generator is configured for microwave processing of the material on the carrier platter; the apparatus also includes a vacuum exhaust configured to exhaust ambient gas within the receiving cavity.

Optionally, a microwave feed port is arranged on the bottom surface of one end of the waveguide far away from the shell.

Optionally, a plurality of microwave generators are disposed around the outer surface of the housing corresponding to the carrier plate.

Optionally, the waveguides of the several microwave generators extend in a radial direction of the axis of rotation over different lengths.

Optionally, the material-loading rotating device includes a plurality of layers of bearing discs, and the apparatus includes a plurality of microwave generators located at corresponding positions above the material on each layer of bearing disc.

Optionally, the material-carrying rotating device comprises a frame body sleeved on the rotating shaft; the frame body comprises a sleeve joint part fixedly combined with the rotating shaft and a plurality of extending parts extending from the sleeve joint part to two sides; one end of the extension part, which is far away from the sleeving part, extends upwards to two sides to form a flange; an opening is formed between the adjacent flanges; the bearing plate comprises a bearing part and a folded edge formed by downward extending from the edge of the bearing part, the folded edge comprises a side edge part and an edge part, the side edge part is used for being combined and fixed with the extending part adjacent to the frame body, and a notch arranged corresponding to the opening is formed in the edge part.

Optionally, the equipment includes a monitoring device, the monitoring device includes a lighting lamp that can be used to provide illumination to the holding cavity and a plurality of sensors that can be used to carry out real-time monitoring to the humidity of material in the holding cavity, heating temperature, the vacuum degree in the holding cavity.

Optionally, the vacuum exhaust device comprises a vacuum pump and a buffer tank; the vacuum pump is communicated with the containing cavity through an exhaust pipeline, and the buffer tank is positioned on the exhaust pipeline.

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 with the waveguide; the microwave generated by the magnetron is transmitted to the waveguide tube through the excitation cavity, and the waveguide tube feeds the microwave into the accommodating cavity.

The invention has the following beneficial effects:

the microwave drying equipment provided by the invention can greatly improve the space utilization rate and the capacity of the equipment and reduce the occupied area of the equipment, thereby saving the construction cost of a plant; the electric cost required by the exhaust of the vacuum exhaust device in the operation process of the equipment can be effectively reduced by improving the space utilization rate of the equipment; meanwhile, the microwave generator is arranged on the outer surface of the shell, so that the microwave generator can be directly installed and replaced from the outer surface of the shell, and the microwave vacuum drying equipment is convenient to overhaul and replace.

In addition, the lengths of the waveguide tubes of the microwave generators extending along the radial direction of the rotating shaft are different, so that the microwave feed ports of the waveguide tubes can cover all positions of the bearing plate as far as possible, microwaves generated by the microwave generators can heat materials on the bearing plate from different positions, the problem of nonuniform microwave heating caused by insufficient microwave penetration depth is solved, the uniformity of material heating on the bearing plate is ensured, and the effect of microwave treatment in the equipment is improved.

In addition, through setting up opening and breach, make things convenient for the loading and unloading car to insert the loading and unloading and bear the dish, improve the work efficiency of loading and unloading material.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 illustrates a structural cross-sectional view of a microwave vacuum drying apparatus according to an embodiment of the present invention.

Fig. 2 shows a schematic configuration of a microwave generator according to an embodiment of the present invention.

Fig. 3 illustrates a structural cross-sectional view of a microwave generator according to an embodiment of the present invention.

Fig. 4 shows a schematic structural view of a charge circulation device according to an embodiment of the present invention.

Fig. 5 illustrates a structural view of a magazine according to an embodiment of the present invention.

Fig. 6 shows a schematic structural view of a carrier tray according to an embodiment of the present invention.

Fig. 7 illustrates a structural plan view of a microwave vacuum drying apparatus according to an embodiment of the present invention.

Fig. 8 illustrates a front view of a structure of a microwave vacuum drying apparatus 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 object, in one embodiment of the present invention, there is provided a microwave vacuum drying apparatus, as shown in fig. 1 to 8, including a housing 10 having a receiving chamber formed therein; in a specific embodiment, the housing 10 includes a first housing 11 and a sliding door 12 disposed at one side of the first housing 11, the sliding door 12 and the first housing 11 can be assembled to form a containing cavity, and materials can be loaded and unloaded into and from the containing cavity through the sliding door 12. In a further embodiment, the translation door 12 is provided with a microwave shielding net and a sealing strip, so that double-layer isolation of the accommodating cavity from outside microwaves and ambient gas can be realized. The sealing strip can be a D-shaped conductive silicone sealing strip. As shown in fig. 1, the apparatus further includes a material loading rotating device 20 located in the accommodating cavity, the material loading rotating device 20 includes a rotating shaft 21 and at least one layer of carrying tray 22 arranged around the rotating shaft 21 for carrying the material to be dried, the rotating shaft 21 can drive the carrying tray 22 to rotate around the axis of the rotating shaft 21; in a specific embodiment, the rotating shaft 21 penetrates the top surface of the housing 10 and is connected to a reduction motor outside the housing 10. The rotating shaft 21 is rotated by the reduction motor, thereby rotating the carrier tray 22. It will be appreciated that the rotating shaft may be rotated by other means commonly used in the art, such as gears. As shown in fig. 1, 7 and 8, the apparatus further includes a plurality of microwave generators 30 located on the outer surface of the housing 10, where the microwave generators 30 at least include wave guides 31 penetrating through the housing 10 and extending into the accommodating cavities along the radial direction of the rotating shaft 21, the wave guides 31 are located at corresponding positions above the material on the carrier tray 22, and the wave guides 31 are used for feeding microwaves into the accommodating cavities to heat the material below the wave guides 31 with microwaves. The microwave generator is configured for microwave processing of the material on the carrier platter; the apparatus further comprises a vacuum exhaust 40 configured for exhausting ambient gas within the receiving cavity.

When the microwave vacuum drying equipment works, firstly, the translation door 12 is moved, materials are placed on the bearing tray 22, the translation door 12 is closed, then the material bearing rotating device 20 and the vacuum exhaust device 40 are started, and the rotating shaft 21 drives the materials on the bearing tray 22 to rotate around the axis of the rotating shaft 21. Then, the microwave generator 30 is started, the microwave generated by the microwave generator 30 is fed into the containing cavity through the waveguide 31, and the material below the waveguide 31 is subjected to microwave heating and drying. After the heating and drying of the material are completed, the environmental gas in the accommodating cavity is exhausted through the vacuum exhaust device 40, so that the accommodating cavity is consistent with the external air pressure. And opening the translation door 12, taking the bearing disc 22 out, and taking out the dried material.

According to the microwave vacuum drying equipment provided by the embodiment, the material is divided into multiple layers in the three-dimensional space by adopting the material carrying rotating device, so that the space utilization rate and the handling capacity of the equipment are greatly improved, the productivity of the equipment is further improved, the occupied area of the equipment is reduced, and the construction cost of a plant is saved; the electric cost required by the exhaust of the vacuum exhaust device in the operation process of the equipment can be effectively reduced by improving the space utilization rate of the equipment; meanwhile, the microwave generator is arranged on the outer surface of the shell, so that the microwave generator can be directly installed and replaced from the outer surface of the shell, and the microwave drying equipment is convenient to overhaul and replace.

In a specific embodiment, the bottom surface of the waveguide 31 at the end far away from the housing 10 is provided with a microwave feed opening 32. As shown in fig. 2-3, the microwave feed 32 is used to directly perform microwave heating drying on the material under the waveguide 31 by the microwave generated by the microwave generator 30 through the microwave feed 32. In another embodiment, a plurality of microwave generators 30 are disposed around the outer surface of housing 10 corresponding to carrier platter 22, as shown in FIG. 7, i.e., the ends of waveguides 31 cover different locations of carrier platter 22. The structure of the embodiment can ensure that the microwave generated by the microwave generator directly acts on the materials at different positions on the bearing plate, thereby improving the microwave treatment effect of the equipment.

In a specific embodiment, the waveguides 31 of the plurality of microwave generators 30 have different lengths extending in a radial direction of the rotation shaft 21. As shown in fig. 7, that is, the microwave mouths 32 of different waveguides 31 are located at different positions on the carrier tray 22, and at the same time, adjacent waveguides 31 do not interfere with each other, so that the microwave feed ports of the waveguides can cover the positions of the carrier tray as much as possible, and thus, the microwave generated by the microwave generator can perform microwave treatment on the material on the carrier tray from different angles and different positions, thereby solving the problem of uneven microwave heating caused by insufficient penetration depth of the microwave, ensuring uniformity of material heating on the carrier tray, and improving the effect of microwave treatment inside the device. In a more specific embodiment, the length of the waveband tube 31 is within the range of 200 mm and 900mm, and can be selected according to actual operation requirements and specification and size of the equipment. In another specific embodiment, the material-carrying rotating device 20 includes a plurality of layers of carrying trays 22, and the apparatus includes a plurality of microwave generators 30 located at corresponding positions above the material on each layer of carrying trays 22, as shown in fig. 1, the apparatus of this embodiment can further improve the throughput of the apparatus, and further improve the capacity of the apparatus, and meanwhile, the plurality of corresponding microwave generators are arranged at corresponding positions above the material on each layer of carrying trays, so as to ensure that the material on each layer of carrying trays is uniformly heated and dried, and further improve the microwave processing effect of the apparatus. In a specific embodiment, a plurality of carrier plates 22 are fixed to the rotating shaft 21 at equal intervals.

In a specific embodiment, as shown in fig. 4-7, the loading rotator 20 includes a frame 23 disposed on the rotating shaft 21; the frame body 23 includes a sleeve portion 231 fixedly combined with the rotating shaft 21 and a plurality of extending portions 232 extending from the sleeve portion 231 to both sides; one end of the extending part 232 far away from the sleeve part 231 extends upwards to two sides to form a flange 233; openings 234 are formed between adjacent ribs 233; in a specific embodiment, this portion 231 that cup joints is columniform sleeve, telescopic upper and lower face runs through to be used for fixed with the cooperation of axis of rotation 21, including four extensions 232 on the support body 23, this extension 232 is for being used for strengthening the reinforcing skeleton of support body rigidity, this flange 233 is annular skeleton, the rigidity of support body can further be strengthened to this annular skeleton on the one hand, on the other hand can fix the carrier disc who sets up on the support body, play the effect that blocks to carrying the disc, prevent to carry the disc at rotatory in-process, because the effect of centrifugal force and outwards roll-off. In addition, the carrier tray 22 includes a supporting portion 221 and a folded edge 222 extending downward from the edge of the supporting portion 221, the folded edge 222 includes a side edge portion 223 and an edge portion 224, the side edge portion 223 is used for being combined and fixed with the extending portion 232 adjacent to the frame body 23, that is, the carrier tray 22 is disposed between the extending portions 232 adjacent to the frame body 23. The edge portion 224 is formed with a notch 225 corresponding to the opening 234. In one embodiment, the carrier plate 22 has a sector structure of 1/4 circles, that is, four carrier plates 22 can be placed on the frame 23 at the same time. The frame body 23 comprises four extending parts 232 and four openings 234, and by placing the carrier tray 22 on the frame body 23, the notches 225 of the four carrier trays 22 are respectively aligned with the four openings 234 on the frame body 23, so that an inlet for inserting a loading and unloading vehicle is formed, the loading and unloading vehicle can be inserted from the inlet between the frame body and the carrier tray, the carrier tray is lifted upwards and then pulled outwards, and the quick loading and unloading of the carrier tray are realized.

In a specific embodiment, as shown in fig. 2-3, the microwave generator 30 includes a magnetron 33 and an excitation cavity 34 having one end communicating with the magnetron 33, and the other end of the excitation cavity 34 is fixedly connected to the waveguide 31; the microwave generated by the magnetron 33 is transmitted to the waveguide 31 through the excitation chamber 34, and the waveguide 31 feeds the microwave into the receiving chamber. It will be appreciated that the microwave generator 30 also includes a switching power supply (not shown) for providing a high voltage power to the magnetron 33 so that the magnetron 33 generates microwaves. In one specific embodiment, the excitation chamber 34 and waveguide 31 are bolted together by a flange 35. Further, the flange 35 is provided with a sealing groove 36 for mounting a sealing strip on both side surfaces thereof, and the flange is hermetically sealed by the sealing strip. The microwave generator 30 also comprises a sealing plate (not shown) arranged between the waveguide 31 and the excitation chamber 34. In a specific embodiment, the material of the sealing sheet is polytetrafluoroethylene, and the sealing sheet can be used for realizing gas insulation between the excitation cavity and the containing cavity.

In a specific embodiment, equipment is including monitoring devices, monitoring devices including can be used to right hold the intracavity and provide the light of illumination and can be used to right hold humidity, the heating temperature of intracavity material, hold a plurality of sensors that the vacuum in the intracavity carries out real time monitoring, in an embodiment, this monitoring devices is including humidity probe, temperature probe, pressure sensor, camera etc. through monitoring devices and microwave generator's cooperation, monitoring devices can monitor the vacuum that holds the intracavity at the rotatory in-process of axis of rotation 21, when the vacuum that holds the intracavity reaches the requirement, start microwave generator 30 and carry out microwave heating to the material that holds on the dish 22. In addition, in the process that the microwave generator 30 performs microwave heating drying on the materials in the accommodating cavity, the monitoring device performs real-time monitoring on the temperature of the materials in the accommodating cavity, and when the monitoring device senses that the temperature of the materials reaches the upper limit of a set value, the microwave generator 30 is turned off; when the monitoring device senses that the temperature of the material is reduced to the lower limit of the set value, the microwave generator 30 is started again to perform microwave heating and drying on the material. The material is heated by microwave through a temperature control heating mode realized by the synergistic action of the monitoring device and the microwave generator, so that the high-quality drying of the material can be realized.

In a specific embodiment, as shown in fig. 8, the vacuum exhaust device 40 includes a vacuum pump 41, a buffer tank 42; the vacuum pump 41 is communicated with the containing cavity through an exhaust pipeline 43, and the buffer tank 42 is positioned on the exhaust pipeline 43. It can be understood that, as shown in fig. 8, the vacuum exhaust apparatus 40 further includes a water tank 44 connected to the vacuum pump 41, and the water tank 44 further includes a water inlet valve 45 and a water discharge valve 46. One end of the buffer tank 42 communicates with the vacuum pump 41, and the other end of the buffer tank 42 communicates with the exhaust pipe 43. 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 when an accident happens. In a specific embodiment, a one-way valve 47 and a release valve 48 are arranged on the exhaust pipeline 43, the one-way valve 47 is used for controlling the gas connection and disconnection between the exhaust pipeline 43 and the outside air, and the release valve 48 is used for releasing the gas in time so that the accommodating cavity is consistent with the air pressure of the outside. In consideration of the heating temperature of the vegetables and fruits and the required vacuum degree, in an alternative embodiment, the vacuum pump 41 is a water ring vacuum pump.

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.

Claims

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

a housing having an accommodating chamber formed therein;

the material loading and rotating device is positioned in the accommodating cavity and comprises a rotating shaft and at least one layer of bearing disc which is arranged around the rotating shaft and can be used for bearing the dried material, and the rotating shaft can drive the bearing disc to rotate around the axis of the rotating shaft;

the device also comprises a plurality of microwave generators positioned on the outer surface of the shell, wherein each microwave generator at least comprises a waveguide tube which penetrates through the shell and extends into the containing cavity along the radial direction of the rotating shaft, and the waveguide tube is positioned at a corresponding position above the material on the bearing disc;

the microwave generator is configured for microwave processing of the material on the carrier platter;

the apparatus also includes a vacuum exhaust configured to exhaust ambient gas within the receiving cavity.

2. A microwave vacuum drying apparatus according to claim 1, wherein a bottom surface of an end of the waveguide remote from the housing is provided with a microwave feed.

3. A microwave vacuum drying apparatus according to claim 1, wherein a plurality of microwave generators are disposed around the outer surface of the housing corresponding to the carrier plate.

4. A microwave vacuum drying apparatus according to claim 1, wherein the waveguides of the plurality of microwave generators extend in a radial direction of the rotation axis with different lengths.

5. A microwave vacuum drying apparatus according to claim 1, wherein the carrier rotating means comprises a plurality of layers of carrier trays, and the apparatus comprises a plurality of microwave generators located at corresponding positions above the material on each layer of carrier tray.

6. The microwave vacuum drying equipment as claimed in claim 1, wherein the material-carrying rotating device comprises a frame body sleeved on a rotating shaft;

the frame body comprises a sleeve joint part fixedly combined with the rotating shaft and a plurality of extending parts extending from the sleeve joint part to two sides; one end of the extension part, which is far away from the sleeving part, extends upwards to two sides to form a flange; an opening is formed between the adjacent flanges;

the bearing plate comprises a bearing part and a folded edge formed by downward extending from the edge of the bearing part, the folded edge comprises a side edge part and an edge part, the side edge part is used for being combined and fixed with the extending part adjacent to the frame body, and a notch arranged corresponding to the opening is formed in the edge part.

7. A microwave vacuum drying apparatus according to claim 1, wherein the apparatus comprises a monitoring device, and the monitoring device comprises an illumination lamp for illuminating the containing chamber and a plurality of sensors for real-time monitoring of the humidity, heating temperature and vacuum degree of the material in the containing chamber.

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 communicated with the containing cavity through an exhaust pipeline, and the buffer tank is positioned on the exhaust pipeline.

9. 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 the waveguide tube;

the microwave generated by the magnetron is transmitted to the waveguide tube through the excitation cavity, and the waveguide tube feeds the microwave into the accommodating cavity.