CN211064887U - Solar hot air drying equipment is united to contact ultrasonic wave - Google Patents
Solar hot air drying equipment is united to contact ultrasonic wave Download PDFInfo
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Abstract
The utility model discloses a solar hot air drying equipment is united to contact ultrasonic wave, include: the device comprises a hot air drying box, an ultrasonic device and a solar hot air device; the ultrasonic device and the solar hot air device are respectively connected with the hot air drying box; solar energy is utilized to drive the solar hot air device to work, so that the energy consumption of the drying system is reduced; when the weather conditions are not good, namely the hot air generated by the solar energy is higher than the room temperature but can not reach the required temperature, the auxiliary heating device can be started to carry out secondary auxiliary heating on the solar hot air so as to stabilize the temperature of the hot air; utilize the utility model discloses the dry fruit vegetables of contact ultrasonic wave joint solar hot air drying equipment through ultrasonic mechanical effect and cavity effect, changes the texture of material in drying process, strengthens the mass transfer rate of moisture, can not only reduce the energy consumption in the drying process, can also save 20% ~70% drying time, is showing and shortens drying time, improves product quality, reduces the nutritional loss after the fruit vegetables are dry.
Description
Technical Field
The utility model belongs to the technical field of food processing, concretely relates to solar hot air drying equipment is united to contact ultrasonic wave.
Background
The perishable nature of fruits and vegetables limits their space for further value-added and application, and drying is a common method for extending the shelf life of fruits and vegetables, not only reducing the quality and volume of food, but also reducing the storage and transportation costs. Common traditional drying modes such as sun drying, hot air drying and the like not only have the defects of long drying time and high energy consumption, but also can damage nutrient substances and bioactive components in fruits and vegetables, thereby promoting the development of a series of replaceable novel drying technologies. The ultrasonic wave is a mechanical wave with the frequency higher than 20kHz, and the structure and the performance of the material can be changed by the mechanical action and the cavity effect generated by the ultrasonic wave, so that the moisture can be removed through a tiny pipeline, and the drying time is shortened. In addition, the release of nutrient active substances can be promoted by the ultrasonic waves to cell membranes and cell walls, and the increase of the micro-channels and the porosity can also avoid the rapid increase of the temperature of materials in the drying process, so that the auxiliary drying process of the heat-sensitive food materials can be realized. The contact type ultrasonic wave combined solar hot air drying can remarkably shorten the drying time, improve the drying efficiency and improve the nutrition and color of the product.
In the prior art, patent CN108645125A discloses a method for drying fruits and vegetables by contact type ultrasonic-assisted hot air and an ultrasonic-assisted hot air drying device, the device comprises an ultrasonic generator, an ultrasonic transducer, an ultrasonic probe, a hot air generator and an object stage, and whether the materials and the ultrasonic probe contact each other in the drying process can be controlled by adjusting the height of the object stage. The ultrasonic probe of the device has small size, and the generated ultrasonic waves can only act on a small amount of or small fruit and vegetable materials, so the limitation of sample selection is large, and the yield is low. In addition, the hot air in the drying process of the device is all from electric heating, and more energy is consumed compared with solar hot air.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems in the prior art, the utility model discloses a another purpose provides a solar hot air drying equipment is united to contact ultrasonic wave of implementing this method, utilizes the solar hot air drying fruit vegetables of contact ultrasonic wave combination, not only can reduce the energy consumption, can also shorten drying time to effectively reduce the loss of nutrient composition in the fruit vegetables.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
A contact ultrasonic combined solar thermal air drying apparatus comprising: the ultrasonic wave device and the solar hot air device are respectively connected with the hot air drying box;
The hot air drying box is provided with a box body; the box body is divided into an upper part and a lower part, the upper half part of the box body is divided into a left side and a right side, the left side is a heating area, and the right side is a drying area; the heating area is provided with an auxiliary heating device, the back of the heating area is provided with a first air inlet, and the first air inlet is connected with an external solar hot air plate through a hot air pipeline; the auxiliary heating device is an electric heating device;
The drying area is provided with an ultrasonic probe and a temperature probe, a second air inlet and a circulating air inlet are formed in the box wall dividing the heating area and the drying area, and an air outlet and a moisture exhaust port are formed in the box wall on the right side of the drying area; the second air inlet and the second air outlet are horizontal in the box body, and hot air generated by the fan passes through the material in the horizontal direction; the oven has a hot air constant temperature control function, a hot air internal circulation function and a pumping and dehumidifying function; the lower half box body is provided with an ultrasonic generator and a circuit connecting device;
The ultrasonic device consists of an ultrasonic generator, an ultrasonic transducer and an ultrasonic probe, the ultrasonic probe is positioned in a drying area at the upper half part of the hot air drying box body, and materials are placed above the ultrasonic probe to be used as a material tray; the ultrasonic generator is positioned at the lower half part of the box body of the hot air drying box and is electrically connected with the ultrasonic transducer;
The solar hot air device is formed by combining more than two solar hot air plates, the solar hot air plates are respectively connected from bottom to top by hot air pipelines, and the hot air pipelines are provided with fans 302; cold air enters from a hot air pipeline of the first solar hot air plate, is heated by the solar panel and transported by the pipeline, is converted into hot air and is transmitted into a first air inlet of a heating area of the hot air drying box.
Preferably, the electric heating device is provided with an electric heater, and the electric heater can be transversely arranged or vertically arranged.
More preferably, the number of the electric heaters is 1 or more.
Preferably, the solar hot air device is formed by connecting three solar hot air plates in series through a hot air pipeline.
Preferably, the number of the moisture exhaust openings and the number of the circulating air openings are more than 2.
Preferably, a heat insulation layer is arranged on the outer side of the box body; the heat insulation layer mainly has the functions of preventing heat loss and keeping the temperature in the drying box constant.
The method for drying the fruits and vegetables by the contact type ultrasonic wave combined solar hot air can switch the combined or independent operation of the solar hot air and the auxiliary electric heating according to different weather conditions; when the solar energy is used for drying the fruit and vegetable materials, the ultrasonic waves are directly contacted with the surfaces of the fruit and vegetable materials for auxiliary drying so as to shorten the drying time.
Preferably, the method for drying the fruits and vegetables by using the contact type ultrasonic wave combined solar hot air drying equipment specifically comprises the following steps:
(1) Fruit and vegetable material pretreatment: cleaning the fruit and vegetable materials and then cutting;
(2) And (3) contact ultrasonic wave combined solar hot air drying: placing the fruit and vegetable materials processed in the step (1) on an ultrasonic probe, sequentially opening a solar hot air device, an auxiliary heating device and an ultrasonic device, carrying out contact type ultrasonic combined solar hot air drying on the fruit and vegetable materials, selectively opening a moisture removal switch and an internal circulation switch according to drying requirements, and obtaining the dehydrated fruit and vegetable after drying.
The solar hot air device can reduce the energy consumption of the drying system through solar heating.
The auxiliary heating device can perform secondary auxiliary heating on solar hot air to stabilize the temperature of the hot air when the hot air generated by solar energy is higher than the room temperature but cannot reach the set temperature.
The ultrasonic waves generated by the ultrasonic device directly act on the material to be dried from bottom to top.
In the step (2), the temperature of hot air drying is 50-70 ℃, and the drying air speed is 1.0-5.0 m/s.
In the step (2), the ultrasonic frequency of the ultrasonic auxiliary drying treatment is 20KHz, and the ultrasonic power is 480-800W.
Compared with the prior art, the method has the following beneficial effects:
(1) The utility model discloses in being applied to fruit vegetables drying process with ultrasonic wave technique and solar hot air drying technique jointly, under the combined action of supersound mechanical effect, cavitation effect and heat effect, the inner structure of material becomes fluffy spongy, not only can strengthen the hot air drying process, can also show and shorten drying time, can save 20% ~ 70% drying time.
(2) The utility model discloses a solar hot air drying is united to contact ultrasonic wave adopts large-scale ultrasonic transducer as the material dish, and the sample on the probe can direct action to the during operation ultrasonic wave, has effectively solved the ultrasonic energy utilization rate reduction problem that the ultrasonic wave leads to because of the air is to the dilution of sound wave and the acoustic impedance mismatch between air and the material. The contact type ultrasonic wave can effectively reduce the loss of nutrient substances and bioactive components in the product and improve the quality and the appearance color of the dried product while improving the heat and mass transfer and shortening the drying time, and is superior to the traditional hot air drying of dehydrated fruits and vegetables.
(3) The contact type ultrasonic wave and solar hot air combined drying introduces solar hot air on the basis of ultrasonic wave and hot air combined drying, and solves the problem of high energy consumption caused by adding ultrasonic waves in the drying process. When the ambient temperature does not reach the working condition, the drying temperature can be kept stable by starting the auxiliary heating device.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a contact ultrasonic combined solar hot air drying apparatus according to the present invention;
Fig. 2 is a schematic structural view of the contact type ultrasonic wave combined solar hot air drying device in another direction;
FIG. 3 is a schematic view of a drying zone structure of the contact ultrasonic combined solar hot air drying apparatus of the present invention;
FIG. 4 is a schematic view of the internal structure of the drying zone of the contact ultrasonic combined solar hot air drying apparatus of the present invention;
FIG. 5 is a schematic view of the lower half part of a box body of the contact type ultrasonic combined solar hot air drying device of the present invention;
In the figure, 100-a hot air drying box, 200-an ultrasonic device, 300-a solar hot air device, 101-a box body, 102-a first air inlet, 103-a control panel, 104-a temperature probe, 105-a second air inlet, 106-a circulating air inlet, 107-an air outlet, 108-a moisture exhaust port, 109-an electric heater, 201-an ultrasonic probe, 202-an ultrasonic generator, 203-an ultrasonic transducer, 301-a solar hot air plate and 302-a fan.
FIG. 6 is a graph comparing the curves of the broccoli in examples 1 to 2 with those in the case of single hot air drying.
FIG. 7 is a graph comparing the curve of the water lily petals dried by 3-5 hot air.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The utility model discloses a contact type ultrasonic combined solar hot air drying device, refer to fig. 1, comprising a hot air drying box 100, an ultrasonic device 200 and a solar hot air device 300, wherein the ultrasonic device 200 and the solar hot air device 300 are respectively connected with the hot air drying box 100;
The hot air drying box 100 is provided with a box body 101; the box body 101 is divided into an upper part and a lower part, the upper half part of the box body 101 is divided into a left side and a right side, the left side is a heating area, and the right side is a drying area; the heating area is provided with an auxiliary heating device, the back of the heating area is provided with a first air inlet 102, and the first air inlet 102 is connected with an external solar hot air plate 301 through a hot air pipeline; the auxiliary heating device is an electric heater 109;
The drying zone is provided with an ultrasonic probe 201 and a temperature probe 104, a second air inlet 105 and a circulating air inlet 106 are arranged on the box wall dividing the heating zone and the drying zone, and an air outlet 107 and a moisture exhaust port 108 are arranged on the box wall on the right side of the drying zone; the positions of the second air inlet 105 and the second air outlet 107 in the box body 101 are horizontal, and hot air conveyed by the fan 302 passes through the material in the horizontal direction; the hot air drying box 100 has a hot air constant temperature control function, a hot air internal circulation function and a pumping and dehumidifying function; the lower half box is provided with an ultrasonic generator 202 and a circuit connecting device.
The ultrasonic device 200 consists of an ultrasonic generator 202, an ultrasonic transducer 203 and an ultrasonic probe 201, wherein the ultrasonic probe 201 is positioned in a drying area at the upper half part of the hot air drying box body 101 and is electrically connected with the ultrasonic transducer 203 and the ultrasonic generator 202, and materials are placed above the ultrasonic probe 201 and used as a material tray; the ultrasonic generator 202 is positioned at the lower half part of the hot air drying box body 101 and is electrically connected with the ultrasonic transducer 203.
The solar hot air device 300 is formed by combining more than three solar hot air plates 301, the solar hot air plates 301 are respectively connected from bottom to top by hot air pipelines, and the hot air pipelines are provided with fans 302.
The method for drying the fruits and vegetables by using the contact type ultrasonic wave combined solar hot air drying equipment of the embodiment comprises the following steps:
(1) Fruit and vegetable material pretreatment: cleaning the fruit and vegetable materials and then cutting;
(2) And (3) contact ultrasonic wave combined solar hot air drying: placing the fruit and vegetable materials processed in the step (1) on an ultrasonic probe, sequentially opening a solar hot air device, an auxiliary heating device and an ultrasonic device, starting a fan, enabling cold air to enter from a hot air pipeline of a first solar hot air plate, heating by a solar plate and transporting by a pipeline, converting the cold air into hot air, transmitting the hot air into a first air inlet 102 of a heating area of a hot air drying box, and conveying the hot air to a drying area through a second air inlet 105; the fruit and vegetable materials are dried by contact ultrasonic wave combined solar hot air, and then are discharged through the air outlet 107, when the air humidity of the air outlet is low, the valve on the hot air pipeline in front of the solar hot air plate 301 and the air outlet 107 are closed, the circulating air inlet 106 and the moisture exhaust port 108 are opened, so that a closed internal circulation is formed between the drying area and the heating area, and the fruit and vegetable are dried under the combined action of the ultrasonic wave and the hot air.
Example 2
The other points are the same as those in embodiment 1, except that in this embodiment, the number of the circulation tuyere 106 and the moisture exhaust port 108 is 2.
Example 3
The rest is the same as the embodiment 1, and the difference is that in the embodiment, a heat insulation layer is arranged on the outer side of the box body; the heat insulation layer mainly has the functions of preventing heat loss and keeping the temperature in the drying box constant.
Performance testing
The broccoli and the lotus petals were dried using the contact ultrasonic wave combined with solar hot air drying apparatus of example 2.
Example 4
(1) selecting fresh broccoli with bright color, complete shape and no plant diseases and insect pests, cleaning, air drying, and cutting flower head into 2cm × 2cm cubes.
(2) And opening a power switch of the hot air drying box, placing the cut broccoli head above the ultrasonic probe, starting solar hot air and auxiliary heating, adjusting the drying temperature of the hot air drying box to be 60 ℃ and the air speed to be 2m/s, and starting internal circulation and moisture removal. The ultrasonic power is 125.2W/dm 2The ultrasonic frequency is 20kHz, the ultrasonic state is 5s on and 5s off, and the drying time is 400min to reach the drying end point.
Example 5
(1) selecting fresh broccoli with bright color, complete shape and no plant diseases and insect pests, cleaning, air drying, and cutting flower head into 2cm × 2cm cubes.
(2) Turning on a power switch of a hot air drying box, placing the cut broccoli head above the ultrasonic probe, and starting solar hot air and auxiliary Heating, adjusting the drying temperature of the hot air drying box to 60 ℃, the air speed to 2m/s, and starting internal circulation and moisture removal. The ultrasonic power is 180.1W/dm 2The ultrasonic frequency is 20kHz, the ultrasonic state is 5s on and 5s off, and the drying end point can be reached after 370min of drying.
Example 6
(1) Selecting fresh nymphaea tetragona with bright color and complete shape, peeling off petals one by one, cleaning and drying.
(2) Turning on a power switch of a hot air drying box, placing the petals of the nymphaea tetragona above an ultrasonic probe, starting solar hot air and auxiliary heating, adjusting the drying temperature of the hot air drying box to be 60 ℃ and the air speed to be 2m/s, and starting internal circulation and moisture removal. The ultrasonic power is 180.1W/dm 2The ultrasonic frequency is 20kHz, the ultrasonic state is 5s on and 5s off, and the drying end point can be reached after 24min of drying.
Example 7
(1) Selecting fresh nymphaea tetragona with bright color and complete shape, peeling off petals one by one, cleaning and drying. Soaking flos Nelumbinis petal in 0.39% sodium alginate solution at 35.3 deg.C for 21.8min, air drying, and removing clear water.
(2) Turning on a power switch of a hot air drying box, placing the petals of the nymphaea tetragona above an ultrasonic probe, starting solar hot air and auxiliary heating, adjusting the drying temperature of the hot air drying box to be 60 ℃ and the air speed to be 2m/s, and starting internal circulation and moisture removal. The ultrasonic power is 180.1W/dm 2The ultrasonic frequency is 20kHz, the ultrasonic state is 5s on and 5s off, and the drying end point can be reached after drying for 70 min.
Example 8
(1) Selecting fresh nymphaea tetragona with bright color and complete shape, peeling off petals one by one, cleaning and drying. Treating flos Nymphaeae with steam at 110 deg.C for 20s, air drying, and removing clear water.
(2) And opening a power switch of the hot air drying oven, and connecting the ultrasonic generating device with the 3 electric wires in the lower layer of the drying oven one by one. Placing flos Nymphaeae petal above ultrasonic probe, starting solar hot air and auxiliary heating, adjusting drying temperature of hot air drying oven to 60 deg.C and air speed to 2m/s, and starting internal circulation and discharge And (5) wetting. The ultrasonic power is 180.1W/dm 2The ultrasonic frequency is 20kHz, the ultrasonic state is 5s on and 5s off, and the drying end point can be reached after 24min of drying.
Comparative example
Adopt and respectively the utility model discloses a contact ultrasonic wave is united solar hot-air drying fruit vegetables's method's embodiment 4 ~ 8 the same drying temperature, dry wind speed and the same dry object carry out single hot air drying comparative example.
(1) selecting fresh broccoli with bright color, complete shape and no plant diseases and insect pests, cleaning, air drying, cutting flower head into 2cm × 2cm cubes, drying with hot air, and drying with 125.2W/dm 2Ultrasonic wave combined solar hot air drying and 180.1W/dm 2And drying by combining ultrasonic waves and solar hot air drying. And (3) placing the sample on an ultrasonic probe in the contact type ultrasonic wave combined solar hot air drying device shown in the figure 1 for drying, quickly taking out the sample every 5min for the first 30min to measure the mass of the sample, quickly returning to continue drying, quickly taking out the sample every 10min after 30min to measure the mass of the sample, quickly returning to continue drying, and repeating the operation until the weight is constant. As can be seen from FIG. 6, the contact ultrasonic wave and solar hot air drying can effectively accelerate the drying rate of the sample and shorten the drying time. When the drying end point is reached, the single hot air drying process needs 450min and 125.2W/dm 2And 180.1W/dm 2The contact type ultrasonic wave combined solar hot air drying needs 400min and 370min respectively, and the drying time is shortened by 11.1 percent and 17.8 percent respectively compared with single hot air drying.
(2) Selecting fresh flos Nymphaeae with bright color and complete shape, peeling off one piece of petal, cleaning, air drying, and dividing into three groups. The first group is not treated, the second group is soaked in 0.39% sodium alginate solution at 35.3 deg.C for 21.8min, and then taken out for air drying to remove the clear water, and the third group is treated with steam at 110 deg.C for 20s and then air dried to remove the clear water. Drying the three groups of flos Nelumbinis petals with hot air and 180.1W/dm respectively 2And drying by combining ultrasonic waves and solar hot air drying. Placing the sample on an ultrasonic probe in the contact type ultrasonic wave combined solar hot air drying equipment shown in figure 1 for drying, wherein the sample is dried every 1min for the first 5min Quickly taking out the sample to measure the mass of the sample, quickly returning to continuously dry the sample, quickly taking out the sample every 2min to measure the mass of the sample after 5min, quickly returning to continuously dry the sample, and repeating the operation until the weight is constant. As can be seen from FIG. 7, the contact ultrasonic wave and solar hot air drying can effectively accelerate the drying rate of the sample and shorten the drying time. When the end point of drying is reached, for the first group, a single hot air drying takes 80min, 180.1W/dm 2The contact type ultrasonic wave combined solar hot air drying needs 24min, and is shortened by 70.0% compared with single hot air drying; for the second group, the single hot air drying required 70min, 180.1W/dm 2The contact type ultrasonic wave combined solar hot air drying needs 24min, and is shortened by 65.7% compared with single hot air drying; for the third group, the single hot air drying required 30min, 180.1W/dm 2The contact type ultrasonic wave combined solar hot air drying needs 24min, and is shortened by 20.0% compared with single hot air drying.
TABLE 1 comparison of 4-5 examples with single hot air color values
| Treatment method | L* | a* | b* |
| Freeze-drying | 63.23±0.69a | -14.47±0.10d | 21.75±0.14a |
| Single hot wind | 43.87±0.52d | -8.80±0.43a | 16.59±0.28e |
| 125.2W/dm2 | 45.08±0.57c | -9.03±0.46a | 17.13±0.20d |
| 180.1W/dm2 | 43.96±0.58d | -9.39±0.48b | 17.19±0.35d |
color measurement is carried out by a color difference meter, the instrument is calibrated by a white porcelain plate, and the L of the sample is measured according to a CIE L AB color system *、a*And b *value of wherein L *、a*And b *respectively representing lightness, red-green degree and yellow-blue degree (L) of the sample *A larger value indicates a larger luminance; a is *(+) reddish- - -a *(-) greenish; b *(+) yellowish- - -b *(-) bluish) the lyophilized sample was used as a color control instead of the fresh sample, as can be seen from Table 1, L dried by contact ultrasonic wave in combination with solar hot air, relative to single hot air drying *The larger value, i.e. the brighter the colour of the sample, closer to that of the freeze-dried sample, and the a of the sonicated sample *、b*The value is also closer to that of a freeze-dried sample compared with a single hot air, especially after 125.2W/dm 2Sonicated samples.
TABLE 2 Effect of 4-5 contact ultrasonic wave in combination with solar hot air drying on the composition of thioglycoside and its degradation products
measuring glucosinolate content by high performance liquid chromatography, collecting fresh broccoli head 0.2g and ground broccoli powder 0.1g, adding 3m L methanol (70% (v/v)) respectively, inactivating enzyme in 70 deg.C water for 20min, cooling, grinding thoroughly, extracting in 70 deg.C water bath for 20min, centrifuging at 10000r/min for 10min, collecting supernatant, adding 3m L methanol (70% (v/v)) once, centrifuging, mixing supernatant, vacuum drying at 45 deg.C, adding 1m L trifluoroacetic acid (0.05% (v/v)) for redissolving, filtering with 0.45 μm water system membrane, measuring HP L C, measuring sulforaphane content of 4-methylbutylsulroside degradation product sulforaphane by high performance liquid chromatography, collecting fresh broccoli head 0.2g and ground broccoli powder 0.1g, adding 4m L distilled water for thoroughly grinding, extracting with 3 times of ethyl acetate at room temperature, adding small amount of combined sulforaphane layer, drying with 3-180% thioacetic acid, ultrasonic drying to obtain dry sample, and measuring the residual glucosinolate content of 3-82 μm, drying with 3-82 μm ultrasonic wave to obtain dry sample, drying to obtain dry product 2The contents of 3-indolylmethylthioglycoside and 4-methoxy-3-indolylmethylthioglycoside in the sonicated samples were higher than those of the non-sonicated samples. The content of sulforaphane in the broccoli is remarkably reduced after being dried and is 180.1W/dm 2The sulforaphane content in the sonicated samples was higher than in the non-sonicated samples.
The embodiments of the present invention have been described in detail, but these are only examples for the convenience of understanding and should not be construed as limiting the scope of the present invention. Also, any person skilled in the art can make various equivalent changes or substitutions according to the technical solution of the present invention and the description of the preferred embodiment thereof, and all such changes or substitutions shall fall within the protection scope of the claims of the present invention.
Claims (5)
1. A solar hot air drying equipment is united to contact ultrasonic wave, its characterized in that includes: the ultrasonic wave device and the solar hot air device are respectively connected with the hot air drying box;
The hot air drying box is provided with a box body (101); the box body (101) is divided into an upper part and a lower part, the upper half part of the box body (101) is divided into a left side and a right side, the left side is a heating area, and the right side is a drying area; the heating area is provided with an auxiliary heating device, the back of the heating area is provided with a first air inlet, and the first air inlet (102) is connected with an external solar hot air plate (301) through a hot air pipeline; the auxiliary heating device is an electric heating device; the drying zone is provided with an ultrasonic probe (201) and a temperature probe (104), a second air inlet (105) and a circulating air inlet (106) are formed in the box wall dividing the heating zone and the drying zone, and an air outlet (107) and a moisture exhaust port (108) are formed in the box wall on the right side of the drying zone; the second air inlet (105) and the second air outlet (107) are horizontal in the box body (101), and hot air generated by the fan passes through the material in the horizontal direction; the hot air drying box has a hot air constant temperature control function, a hot air internal circulation function and a pumping and dehumidifying function; the lower half box body (101) is provided with an ultrasonic generator (202) and a circuit connecting device;
The ultrasonic device comprises an ultrasonic generator (202), an ultrasonic transducer (203) and an ultrasonic probe (201), wherein the ultrasonic probe (201) is positioned in a drying area at the upper half part of the hot air drying box body (101), and materials are placed above the ultrasonic probe (201) to serve as a material tray; the ultrasonic generator (202) is positioned at the lower half part of the hot air drying box body (101) and is electrically connected with the ultrasonic transducer (203);
The solar hot air device is formed by combining more than two solar hot air plates (301), the solar hot air plates (301) are respectively connected in series from bottom to top through hot air pipelines, and the hot air pipelines are provided with fans (302).
2. Solar thermal air drying plant combined with contact ultrasound according to claim 1, characterized in that the electric heating means are provided with electric heaters (109).
3. The contact type ultrasonic combined solar hot air drying equipment as claimed in claim 1, wherein the solar hot air device is formed by connecting three solar hot air plates (301) in series through a hot air pipeline.
4. The contact ultrasonic combined solar thermal air drying apparatus according to claim 1, wherein the number of the moisture exhaust port (108) and the circulation tuyere (106) is set to 2 or more.
5. Solar thermal air drying plant combined with contact ultrasound according to claim 1, characterised in that the outside of the box (101) is provided with a heat insulation layer.
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