A solar drying device

Abstract

The present invention discloses a solar drying device, which includes a storage rack and a lens. The storage rack is used for placing objects to be dried, and the lens is arranged above the storage rack. The lens includes a plurality of rib groups, and the light rays entering the lens are converged on both sides of the storage rack through the rib groups to heat and dry the objects on the storage rack. During use, the objects to be dried are placed on the storage rack, and the sunlight enters the lens. The incident sunlight is refracted and converged to both sides of the storage rack through the rib groups on the lens, so as to perform double-sided heating with low magnification on the objects on the storage rack. Moreover, the vertically designed storage rack can achieve uniform irradiation on both sides of the laundry, and the vertical placement has a high space utilization rate, and water droplets are easy to drip. Through photothermal conversion, rapid drying can be achieved. The present invention is applicable to the field of solar energy technology.

Description

Technical Field

[0001] The present invention is used in the field of solar energy technology, and particularly relates to a solar drying device. Background Art

[0002] For rapid drying technology, most methods use the method of heating air, generally directly using electric energy. Some drying methods combined with solar energy also perform photothermal conversion through a heat absorption plate, heat the air through the heat absorption plate and then use the hot air for drying, or use a photovoltaic panel to first convert solar energy into electric energy, then convert the electric energy into heat energy, and then heat the air. The moisture on the washed items is carried away by the hot air. This method using hot air as an intermediate medium and performing multiple energy conversions has low efficiency, and the system has many components and a complex structure. If sunlight is directly used to heat the washed items, first, the energy density of sunlight is low and the drying rate is insufficient; second, at the same moment, the sun can only irradiate one side of the washed items, resulting in a low drying rate. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a solar drying device that can improve the drying efficiency.

[0004] An embodiment of the present invention provides a solar drying device, including:

[0005] A storage rack for placing objects to be dried;

[0006] A lens provided above the storage rack. The lens includes a lens frame and a plurality of rib groups. The rib groups are used to refract the light incident on the lens to form a focal plane. Each rib group includes a plurality of micro-ribs with the same inclination angle. The micro-ribs on the lens are symmetrically arranged on the lens frame with the storage rack as the symmetry plane. The arrangement equation of the rib groups is , , with the center of the lens as the origin, is the distance between the end of the nth rib group and the origin, is the width of the nth rib group, N is the refractive index of the micro-ribs, is the distance between the top of the focal plane and the origin, is the distance between the bottom of the focal plane and the origin, is the angle between the micro-ribs of the nth rib group and the lens frame.

[0007] The solar drying device according to the embodiments of the present invention has at least the following beneficial effects: During use, the object to be dried is placed on the storage rack, and sunlight enters the lens. The incoming sunlight is refracted and converged to both sides of the storage rack through the rib group on the lens, thereby heating the object on the storage rack on both sides and drying it. Since this drying device has the effect of double-sided drying, its drying efficiency is higher.

[0008] According to another embodiment of the present invention, the solar drying device further includes a lens bracket, the lens is installed on the lens bracket, and the storage rack is installed below the lens through the lens bracket.

[0009] According to another embodiment of the present invention, the solar drying device further includes a support truss, and the lens bracket is installed on the support truss.

[0010] According to another embodiment of the present invention, the support truss is movably connected to the lens bracket.

[0011] According to another embodiment of the present invention, a first driving device is provided on the support truss, and the first driving device is used to drive the lens bracket to rotate so that the lens tracks the sun.

[0012] According to another embodiment of the present invention, the solar drying device further includes a second driving device, and the second driving device is used to drive the support truss so that the support truss drives the entire device to rotate.

[0013] According to another embodiment of the present invention, both the first driving device and the second driving device are controlled by a single-chip microcomputer.

[0014] According to another embodiment of the present invention, the storage rack is a vertically arranged grid structure. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0016] Figure 2 is a schematic diagram of the focal plane formed after light enters the lens in an embodiment of the present invention;

[0017] Figure 3 is a schematic diagram of the point-focus Fresnel lens condensing cross-section in the prior art;

[0018] Figure 4 is a side view of the focal plane formed after light enters the lens in an embodiment of the present invention;

[0019] Figure 5 It is a schematic diagram of the geometric relationship after light passes through the rib group in an embodiment of the present invention;

[0020] Figure 6 They are the relevant data for arranging the lens in an embodiment of the present invention. Specific Embodiments

[0021] The following will clearly and completely describe the concept of the present invention and the technical effects generated in combination with embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] In the description of the embodiments of the present invention, if it involves orientation description, such as "upper", "lower", "front", "rear", "left", "right", etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0023] In the description of the embodiments of the present invention, if a certain feature is referred to as "set", "fixed", "connected", "installed" on another feature, it can be directly set, fixed, connected, or installed on another feature, or indirectly set, fixed, connected, or installed on another feature. In the description of the embodiments of the present invention, if it involves "several", its meaning is more than one. If it involves "multiple", its meaning is more than two. If it involves "greater than", "less than", "exceeding", it should be understood as not including the number itself. If it involves "above", "below", "within", it should be understood as including the number itself. If it involves "first", "second", it should be understood as used to distinguish technical features, rather than indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0024] See Figures 1 to 5 , the embodiments of the present invention provide a solar drying device, including a storage rack 2 and a lens 1. The storage rack 2 is used to place the object to be dried, and the lens 1 is arranged above the storage rack 2. The lens 1 includes a lens frame 9 and a plurality of rib groups 13. The rib groups 13 are used to refract the light incident on the lens 1 to form a focal plane. Each rib group 13 includes a plurality of micro ribs 11 with the same inclination angle. The micro ribs 11 on the lens 1 are symmetrically arranged on the lens frame 9 with the storage rack 2 as the axis. The arrangement equation of the rib group 13 is, , , with the center of the lens 1 as the origin, is the distance between the end of the nth rib group 13 and the origin, is the width of the nth rib group 13, N is the refractive index of the micro-rib 11, is the distance between the top of the focal plane and the origin, is the distance between the bottom of the focal plane and the origin, is the angle between the micro-rib 11 of the nth rib group 13 and the lens frame.

[0025] Specifically, during use, the object to be dried is placed on the rack 2. The sun's rays enter the lens 1, and the incident sun's rays are refracted and converged to both sides of the rack 2 through the rib group 13 on the lens 1, thereby heating the object on the rack 2 on both sides to dry it. Since this drying device has the effect of double-sided drying, its drying efficiency is higher.

[0026] It should be noted that since dispersion occurs after light is refracted, for a general lens, the farther the focal length, the more serious the dispersion. Therefore, the lens width and focal length cannot be increased without limit. However, this surface-focusing lens can be used with a relatively large mirror width and focal length in the application scenario of the present application. On the one hand, because of surface light concentration, its light-receiving area is relatively large, different from line-focus and point-focus. Even if dispersion occurs, due to the large light-receiving range, most of the light is still within the target. On the other hand, in sunlight, the light-to-heat conversion efficiency is relatively high in the red and near-infrared bands. Since the red and near-infrared bands have longer wavelengths and are not easily dispersed, the drying efficiency remains at a relatively high level.

[0027] As Figure 3 shown in the schematic diagram of the condensing cross-section of a common point-focusing Fresnel lens, along the direction from the center of the lens 1 to the periphery, the inclination angle α of the micro-rib 11 gradually increases, but the increment of its inclination angle α is continuous. The light rays of this structure are refracted and focused at one point. The schematic diagram of the lens cross-section designed by the present invention is as shown in Figure 4 shown. Along the direction from the center of the lens 1 to the periphery of the lens 1, the inclination angle of the micro-rib 11 also gradually increases, but the increment of its inclination angle is non-continuous, but stepped. That is to say, the inclination angles of the micro-ribs 11 within a certain range are the same. The set of all micro-ribs 11 within this range is called the rib group 13. Each rib group 13 refracts the incident light rays to the range f. When all rib groups 13 refract the light rays to the range f, a vertical focal plane 12 is formed. The rack 2 is also vertically arranged. The focal plane 12 covers both sides of the rack 2. The rack 2 is a grid structure, which reduces light blockage on the one hand, and on the other hand, this vertical design can achieve uniform irradiation of both sides of the washed object, and the vertical placement has high space utilization rate and the water droplets are easy to drip. Through photo-thermal conversion, rapid drying can be achieved.

[0028] SeeFigure 1 , Figure 5 , assuming the total width of the mirror is L, the distance between the upper and lower ends of the focal plane and the transmission mirror assembly 1 is , , the focusing range is , the width of the nth flute group 13 is , the distance between the end of the nth corrugated group 13 and the center of the transmission mirror assembly 1 is As mentioned above, since the micro-flute 11 in the same flute group 13 has the same inclination angle, when the incident light is parallel light perpendicular to the mirror surface, AC is parallel to BD, AE is parallel to BG, and a perpendicular line CH is drawn through point C, intersecting BD at point H, and a perpendicular line EF is drawn through point E, intersecting BG at F. According to the geometric relationship, triangle ODB is similar to triangle CDH, and triangle OGB is similar to triangle EFG. Therefore, EG / EF=OG / OB, let EG= , and AB=EF= , OG=Rn, OB= ,therefore , Since the position of the rack 2 for focusing heating in this application is known, that is, f2 and f1 are known, and the diameter L of the transmission mirror assembly 1 is known, the iterative method can be used to calculate … , , and … , , After finding the position and range of each flute group 13, we also need to know the inclination angle of the micro-flutes 11 in the flute group 13. Suppose the inclination angle of the micro-flutes 11 in the nth flute group 13 is , the inclination angles of the micro-flutes 11 in the same flute group 13 are the same. The arrangement position of the flute group 13 obtained from the above content , , ... , the inclination angle can be calculated using the basic design formula of the Fresnel transmission mirror: , where N is the refractive index of the transmission mirror material, and the is the distance between the end of the nth flute group 13 and the origin. So far, the position of each flute group 13, the length of the flute group 13, and the inclination angle of the micro-flutes 11 in the flute group 13 have been calculated.

[0029] Taking the total mirror width of the transmission lens assembly 1 as 2 meters and the mirror length as 4 meters as an example, the object to be dried is generally a washed item. It is set that one side of the washed item receives a double concentration ratio, and since one washed item has two light-receiving surfaces, the original condensing area of 2m x 4m is converged by the transmission lens assembly 1 to an area of 0.5m x 4m. Among them, 0.5m is the vertical height of the focal plane. Assuming that lens 1 uses PMMA material with a refractive index N = 1.49, set = 1.5m, = 2m, = 2( ) = L / 2 = 1m. Substituting the data into the formula , the = 0.25m can be obtained. Further, from the formula we get = - = 0.75. Repeating this iteration, all and can be finally obtained. After obtaining the position of the rib group , substituting it into the formula the … can be obtained. In this embodiment, the final result is as Figure 6 shown. The rib group closest to the edge has a length of 0.25m, and the inclination angle of all the ribs in this group is 36.903°. The same applies to the other rib groups 13. Since the closer to the center of the transmission lens assembly 1, the smaller the inclination angle of the rib group 13. When it reaches with a length of 0.003m, the inclination angle is already less than 1°. In engineering, it can be regarded as parallel, that is, regarded as having no inclination, which is a planar high-transmission glass. Therefore, dividing it into 16 rib groups is sufficient.

[0030] It should be noted that the rib group 13 is the sawtooth micro-rib combination of the Fresnel lens. Since the transmission lens assembly 1 adopts uniform light concentration setting, the light reception is uniform. In the present invention, low-magnification light concentration is used, which can not only increase the temperature of the washed item but also prevent burning the washed item.

[0031] Since light will produce chromatic dispersion after refraction, for general lenses, the farther the focal length, the more serious the chromatic dispersion. Therefore, the lens width and focal length cannot be increased without limit. However, this type of surface-focusing lens can be used with a relatively large mirror width and focal length in the application scenario of this patent. On the one hand, because of surface light concentration, the reception area is relatively large, different from line-focus and point-focus. Even if chromatic dispersion occurs, due to the large reception range, most of the light is still within the target. On the other hand, in sunlight, for the red light and near-infrared bands with relatively high photothermal conversion efficiency, due to their longer wavelengths, it is not easy to produce chromatic dispersion. Therefore, the drying efficiency can still be relatively considerable.

[0032] In some embodiments, the solar drying device further includes a lens support. The lens 1 is fixed on the lens support, and the storage rack 2 is fixed below the lens 1 through the lens support and is located on the focal plane 12 formed after the refraction of the lens 1.

[0033] See Figure 1 , specifically, the lens support includes first support rods 8 provided on both sides of the lens frame. The lens 1 is fixed above the two first support rods 8, and the storage rack 2 is fixed between the two first support rods 8.

[0034] In some embodiments, the solar drying device further includes a support truss. The lens support is installed on the support truss, and the support truss supports the lens support to keep it away from the ground.

[0035] Specifically, the support truss includes a bottom frame 5 and second support rods 10 provided at both ends of the bottom frame 5. The second support rods 10 are connected to the first support rods 8.

[0036] In some embodiments, the support truss is movably connected to the lens support, so that the orientation of the lens 1 can be adjusted at any time to make the sunlight always perpendicularly irradiate on the lens 1.

[0037] Specifically, the two first support rods 8 are respectively hinged to the two second support rods 10.

[0038] In some embodiments, a first driving device is provided on the support truss. The first driving device is used to drive the lens support 8 to rotate to track the sun.

[0039] See Figure 1 , specifically, the first driving device includes a driving motor 6 and a turntable 7. The driving motor 6 is fixed on the second support rod 10, the turntable 7 is installed on the first support rod 8, the driving motor 6 is used to drive the turntable 7 to rotate, and the turntable 7 drives the lens support to rotate so that the lens 1 rotates.

[0040] See Figure 1 , in some embodiments, the solar drying device further includes a second driving device 4. The second driving device 4 is used to drive the support truss so that the support truss drives the whole device to rotate, on the one hand, to assist the first driving device to realize the tracking of the sun by the lens 1.

[0041] In some other embodiments, both the first driving device and the second driving device 4 are controlled by a single-chip microcomputer, so that relevant programs can be compiled in the single-chip microcomputer to adjust the speed according to different latitudes and longitudes, different dates and times.

[0042] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A solar drying device, characterized in that, Including: A storage rack for placing objects to be dried. A lens is provided above the storage rack. The lens includes a lens frame and a plurality of rib groups. The rib groups are used to refract the light incident on the lens to form a focal plane. Each rib group includes a plurality of micro-ribs with the same inclination angle. The micro-ribs on the lens are symmetrically arranged on the lens frame with the storage rack as the symmetry plane. The arrangement equation of the rib groups is, , , with the center of the lens as the origin, is the distance between the end of the nth rib group and the origin, is the width of the nth rib group, N is the refractive index of the micro-rib, is the distance between the top end of the focal plane and the origin, is the distance between the bottom end of the focal plane and the origin, is the angle between the micro-rib of the nth rib group and the lens frame; Wherein, each of the rib groups refracts the incident light to the range f, and when all the rib groups refract the light to the range f, a vertical focal plane is formed. The storage rack is vertically arranged, the focal plane covers both sides of the storage rack, and the storage rack is a grid structure. The solar drying device further includes a lens bracket. The lens is installed above the lens bracket, and the storage rack is installed below the lens through the lens bracket. The solar drying device further includes a support truss, and the lens bracket is installed on the support truss. The support truss is movably connected to the lens bracket. A first driving device is provided on the support truss, and the first driving device is used to drive the lens bracket to rotate so that the lens tracks the sun. The solar drying device further includes a second driving device, and the second driving device is used to drive the support truss so that the support truss drives the whole device to rotate.

2. The solar drying device according to claim 1, characterized in that: Both the first driving device and the second driving device are controlled by a single-chip microcomputer.

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