Controllable light covering system and controllable light covering structure

Abstract

The present invention belongs to the technical field of greenhouses, and discloses a controllable light covering structure, which includes a transparent cover plate, a plurality of light control units, and the plurality of light control units are interconnected to form the upper end surface of the transparent cover plate, the upper end surface is the covering surface of the controllable light covering structure, the light control units divide the sunlight based on the refraction of light so that the divided light is incident below the covering surface; and a transparent bottom plate, which is located below the transparent cover plate and is arranged relative to the transparent cover plate to form a circulation space, and the circulation space transparent bottom plate includes a mounting portion and a transparent portion, a heat absorbing plate for absorbing infrared light in the divided light is mounted on the mounting portion, and the divided light is passed through the transparent portion. Through the above scheme, the visible light and ultraviolet light required for plant growth can be irradiated onto the plants, and the infrared light that generates heat can be absorbed by the heat absorbing plate, so that the heat can be introduced into the greenhouse in winter and the heat can be discharged outside the greenhouse in summer, and finally the purpose of light and heat control can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of greenhouses, and in particular relates to a controllable light covering system and a controllable light covering structure thereof. Background Art

[0002] Facility agriculture is different from the production mode of traditional agriculture. It is an inevitable trend and an important symbol of agricultural modernization. Greenhouses are a type of facility agriculture. Although my country's greenhouses have undergone decades of development, they still face problems such as low mechanization level, low land utilization rate, and short service life, especially how to achieve insulation and heating in winter and shading and cooling in summer.

[0003] In the prior art, some parabolic focusing transparent covering structures are arranged. Due to its low transmittance during the noon period when the sunlight is sufficient, the lowest is only 32%; while the transmittance in the morning and afternoon is relatively high, up to about 60%, so that the covering structure can significantly reduce the light entering the greenhouse during the noon period without affecting the sunlight in the morning and afternoon, which can be reduced by more than 60%, improving the uneven lighting phenomenon in the greenhouse. However, this structure will affect the demand for light when plants grow in different seasons, and it does not take into account the completely different climate conditions in winter and summer in China. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a controllable light covering structure on one hand, which includes: a transparent cover plate, having a plurality of light control units, wherein the plurality of light control units are interconnected to form an upper end surface of the transparent cover plate, and the upper end surface is a covering surface of the controllable light covering structure, and the light control units divide the sunlight based on the refraction of light so that the divided light is incident below the covering surface; and a transparent bottom plate, located below the transparent cover plate and spaced relative to the transparent cover plate to form a circulation space, wherein the transparent bottom plate in the circulation space includes: a mounting portion and a transparent portion, wherein a heat absorbing plate for absorbing infrared light in the divided light is mounted on the mounting portion, and the transparent portion is used for allowing the divided light to pass through.

[0005] Optionally, a plurality of ventilation holes are provided on the transparent bottom plate, and the ventilation holes are connected to the circulation space; and / or the controllable light covering structure further includes: a side panel, which is circumferentially arranged between the transparent cover plate and the transparent bottom plate and located at the edge of the transparent bottom plate or the transparent cover plate, and the side panel is provided with an air inlet and / or an air outlet.

[0006] Optionally, the heat absorption plate is located on an inner surface of the mounting portion, and the inner surface of the mounting portion is opposite to the transparent cover plate.

[0007] Optionally, the light control unit has a groove, the groove is recessed toward the transparent bottom plate, the notch of the groove is directed toward the transparent bottom plate, and the groove wall of the groove divides the frequency of sunlight based on refraction of light.

[0008] Optionally, the cross-section of the inner contour of the groove is an inverted trapezoid or an inverted triangle; the thickness of the groove wall of the groove gradually becomes thicker in the direction from the transparent cover plate to the transparent bottom plate; the cross-section of the outer contour of the groove is an inverted trapezoid or a triangle.

[0009] Optionally, the light control unit further includes: a transparent top plate, the transparent top plate covers the notch of the groove, and both ends of the groove along the length direction of the groove are closed ends.

[0010] Optionally, the heat absorption plate is located below the groove wall of the groove.

[0011] Optionally, there is a gap between two adjacent light control units in the width direction of the light control units, and the gap is connected to the flow space in the direction from the transparent cover plate to the transparent bottom plate.

[0012] Optionally, the controllable light covering structure further comprises: a tracking device, the tracking device is connected to the heat absorbing plate, and is used to drive the heat absorbing plate to track the incident angle of the infrared light in the divided light.

[0013] On the other hand, the present invention provides a controllable light covering system, which includes: a covering structure, which is the above-mentioned controllable light covering structure, used to cover the windows of a greenhouse; a wind control device, connected to the covering structure, used to selectively select a first wind guiding state and a second wind guiding state, the first wind guiding state is to transport the air in the circulation space of the controllable light covering structure to the outside of the greenhouse, and the second wind guiding state is to transport the air in the circulation space of the controllable light covering structure to the inside of the greenhouse.

[0014] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0015] A transparent cover plate and a transparent bottom plate are provided, wherein the transparent cover plate is formed by interconnecting a plurality of light control units, and the light control units divide the sunlight based on the refraction of light so that the divided sunlight is incident on the lower part of the coverage surface of the structure; a heat absorbing plate is provided on the mounting portion of the transparent bottom plate, and the transparent portion of the transparent bottom plate is used for the divided sunlight to pass through, so as to utilize the spectrum division function of the light control unit to introduce the visible light and ultraviolet light required for plant growth through the transparent portion of the transparent bottom plate into the lower part of the transparent bottom plate (i.e., light control), and a plant planting area is usually deployed thereunder, and the infrared light (especially the near-infrared light) that generates heat is absorbed by the heat absorbing plate of the transparent bottom plate, so that the heat absorbing plate can be used as a part of the air collector to heat the air in the flow channel space, which is conducive to realizing the regulation of air heat (i.e., temperature control), such as introducing heat into a greenhouse (or greenhouse) in winter and discharging heat outside the greenhouse in summer, thereby finally achieving the purpose of light and heat control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a controllable light covering structure provided by an embodiment of the present invention;

[0017] Figure 2 A schematic structural diagram of a light control unit and a transparent bottom plate provided in an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of the structure of a controllable light coverage system provided by an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the operation of a controllable light coverage system (season is summer) provided by an embodiment of the present invention;

[0020] Figure 5 A schematic diagram of the operation of a controllable light coverage system (season is winter) provided by an embodiment of the present invention;

[0021] The symbols in the figure are explained as follows:

[0022] 1 transparent cover, 10 light control unit, 11 accommodation space, 12 groove wall, 13 transparent top plate, 14 gap, 15 notch, 16 groove bottom, 2 transparent bottom plate, 20 ventilation hole, 3 side plate, 4 sun, 40 sunlight, 41 ultraviolet light, 42 visible light, 43 infrared, 5 fan, 50 three-way valve, 6 air flow, 7 heat absorption plate, 8 plant, 9 greenhouse, 91 greenhouse low side wall, 92 greenhouse high side wall, 93 greenhouse soil, 100 wind power generation device DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component; it can be a wired electrical connection, a radio connection, or a wireless communication signal connection. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] See also Figure 1~2 An embodiment of the present invention provides a controllable light covering structure, which includes: a transparent cover plate 1 and a transparent bottom plate 2.

[0026] The transparent cover plate 1 is transparent (i.e., sunlight can pass through it), and is used to receive sunlight and allow sunlight to pass through it. It has a plurality of light control units 10, and the plurality of light control units 10 are interconnected to form the upper end surface of the transparent cover plate 1, which is the covering surface of the controllable light covering structure. The covering surface can be a curved surface or a flat surface. When used, the controllable light covering structure covers or closes the window of the greenhouse 9, such as the skylight on the top of the greenhouse. Usually, when the plurality of light control units 10 are connected to each other, the edges of their respective top surfaces are connected to each other, so that the space volume occupied by the connected transparent cover plate 1 is smaller. The light control unit 10 is made of a transparent material, which divides the sunlight based on the refraction of light (i.e., the prism splitting principle) so that the divided sunlight is mainly incident on the bottom of the covering surface, that is, the light of different wavelengths is divided, and the sunlight radiation can be selectively absorbed. The transparent bottom plate 2 is located below the transparent cover plate 1 and is arranged opposite to the transparent cover plate 1, with a gap between the two, and the gap forms a circulation space for air circulation, that is, air flows into the circulation space, enters the circulation space, and then flows out of the circulation space. The transparent bottom plate 2 is used to absorb the infrared light part of the sunlight after frequency division, and is also used to allow other parts of the sunlight after frequency division (such as ultraviolet rays and visible light) to pass through. It has a mounting portion and a transparent portion. A heat absorbing plate 7 is installed on the mounting portion, which is used to absorb the infrared light in the sunlight after frequency division. The heat absorbing plate 7 utilizes solar air heat collection technology, and its arrangement position is preferably such that it can be irradiated by infrared light for a long time, so that more heat can be absorbed. The heat absorbing plate 7 can be a copper substrate with a black chrome coating electroplated, or it can be other materials, which are not limited in this embodiment. The transparent part is used to allow the sunlight after frequency division (such as ultraviolet rays and visible light) to pass through. The transparent part can be characterized by the form of a first through hole, or it can be characterized by a transparent material. The transparent material can be glass (such as ordinary glass or organic glass), a transparent sunlight board, etc. The material of the mounting part can be a transparent material, which makes the processing and manufacturing of the transparent bottom plate 2 simple, or it can be an opaque material, which is not limited in this embodiment. In order to better absorb the infrared light in the divided sunlight and allow the divided sunlight (such as ultraviolet light and visible light) to pass through, the number of mounting parts and transparent parts are both multiple. At this time, a whole transparent bottom plate 2 can be divided into multiple sub-blocks, each sub-block corresponds to a mounting part or a transparent part. The deployment position of the mounting part is preferably such that it can better absorb more infrared light, and the deployment position of the transparent part is preferably such that it can better allow more divided sunlight (such as ultraviolet light and visible light) to pass through. Preferably, the transparent part and the mounting part are both made of transparent materials, that is, the material of the transparent bottom plate is a transparent material.

[0027] A transparent cover plate 1 and a transparent bottom plate 2 are provided, wherein the transparent cover plate 1 is formed by interconnecting a plurality of light control units 10, and the light control unit 10 divides the sunlight based on the refraction of light so that the divided sunlight is incident on the lower part of the cover surface of the structure; a heat absorbing plate 7 is provided on the mounting portion of the transparent bottom plate 2, and the transparent portion of the transparent bottom plate 2 is used for the divided sunlight to pass through, so that the spectrum division function of the light control unit 10 is utilized to introduce the visible light and ultraviolet light required for plant growth into the lower part of the transparent bottom plate 2 through the transparent portion of the transparent bottom plate 2 (i.e., light control), and a planting area with plants 8 planted therein is usually arranged thereunder, so that the plant growth needs are taken into consideration, and the infrared light (especially the near-infrared light) that generates heat is absorbed by the heat absorbing plate 7 on the transparent bottom plate 2, so that the heat absorbing plate 7 can be used as a part of the air collector to heat the air in the flow channel space, which is conducive to realizing the regulation of the air heat (i.e., temperature control), such as introducing the heat into the greenhouse (or greenhouse) 9 in winter and discharging the heat outside the greenhouse 9 in summer, and finally achieving the purpose of light and heat control.

[0028] Usually, this structure is deployed at the window of the greenhouse 9, and there will be a planting area below it. The planting area of ​​the greenhouse 9 is large. In order to improve the fluidity of the air in the greenhouse 9, a ventilation hole 20 is provided on the transparent bottom plate 2, which is connected to the circulation space, so that the air below the transparent bottom plate 2 can be directly connected to the circulation space. The ventilation hole 20 can be the aforementioned first through hole, or it can be the second through hole opened on the transparent part, or it can be the third through hole opened on the mounting part. In this case, there is a gap between the heat absorbing plate 7 and the mounting part. The number of ventilation holes 20 is multiple, and multiple ventilation holes 20 make the air flow more uniform, which can be arranged in a matrix. In other embodiments, the relative arrangement of the interval between the transparent cover plate 1 and the transparent bottom plate 2 can be achieved by arranging a side plate 3 between the two. The side plate 3 is annular and is arranged on the transparent cover plate 1 or the transparent bottom plate 2, so as to enclose a closed space with the transparent cover plate 1 and the transparent bottom plate 2, and an air inlet and an air outlet are opened on the side plate 3, which are respectively connected to the closed space, thereby forming a circulation space. Preferably, the air inlet and the air outlet are arranged relative to each other. The side panels 3 may also be provided with only air outlets, which may cooperate with the ventilation holes 20 on the transparent bottom panel 2. It should be noted that the side panels 3 and the ventilation holes 20 may be provided together or separately, and this embodiment does not limit this.

[0029] The heat absorbing plate 7 is arranged on the inner surface of the mounting portion, and the heat absorbing plate 7 is opposite to the transparent cover plate 1, so that the infrared light is directly absorbed by the heat absorbing plate 7 after passing through the transparent cover plate 1, which can improve the heat absorption effect; when the air flows out of the circulation space, it may be heated by multiple heat absorbing plates 7 in sequence, which can improve the heating effect and is more conducive to the temperature control of the indoor environment of the greenhouse.

[0030] In order to achieve a better light splitting effect, reduce the space occupied by the transparent cover plate 1 and reduce the weight of the transparent cover plate 1, the light control unit 10 has a groove, which is recessed toward the transparent bottom plate 2, that is, the notch of the groove faces away from the transparent bottom plate 2, and the depth direction of the groove extends from the notch 15 to the transparent bottom plate 2. The groove wall 12 of the groove is a portion corresponding to the accommodating space 11 formed by the groove, which divides the sunlight based on the prism light splitting principle, so that the divided sunlight is incident below the transparent cover plate 1. The shape of the groove can be a regular shape, such as a polygon such as a triangle or a rectangle, or an irregular shape, such as a shape composed of curves or a combination of curves and straight lines.

[0031] The cross section of the inner contour of the groove is an inverted trapezoid or an inverted triangle (in this case, one vertex of the triangle is located at the lowest point of the cross section of the inner contour of the groove itself), and the groove wall thickness (such as Figure 1 and Figure 2 The thickness from left to right in the groove gradually becomes thinner in the direction from the transparent cover plate 1 to the transparent bottom plate 2, and at this time, it presents a thin-on-top and thick-on-bottom structure. Such unequal thickness walls will cause the incident light to split after hitting the wall, which is more conducive to the frequency-divided sunlight to be incident in the direction of the transparent bottom plate 2 and is simple to manufacture. The cross-section of the outer contour of the groove is an inverted trapezoid or triangle, which will further cause a gap between adjacent light control units 10, which is conducive to the frequency-divided sunlight to be incident in the direction of the transparent bottom plate 2. The groove walls on both sides of the groove are symmetrically distributed, so that a better light division control effect can be achieved. Preferably, the cross-section of the inner contour of the groove is an inverted trapezoid, the outer contour of the groove is an inverted trapezoid, the short side of the outer contour of the groove is smaller than the long side of the inner contour of the groove, the long side is the top side of the inverted trapezoid, and the short side is the bottom side of the inverted trapezoid, which is conducive to enhancing the light division control effect. The distance between the groove bottom 16 and the short side of the outer contour surface of the groove is less than the minimum wall thickness of the groove wall of the groove, so as to facilitate the projection of light. The thickness between the groove bottom and the short side of the outer contour surface of the groove is equal.

[0032] Since the temperature is low in winter, in order to effectively achieve the heat preservation effect, the light control unit 10 also includes: a transparent top plate 13, which covers the notch 15 of the groove, that is, the transparent top plate 13 closes the notch 15 of the groove and does not present an open shape, and the two ends of the groove along the length direction of the groove are closed ends (such as Figure 1 and Figure 2The front and rear ends of the light control unit 10 are both closed ends), so that the accommodation space 11 formed by the groove of the light control unit 10 is a closed accommodation space (or closed space), which is hollow and can improve the heat preservation effect. When used, air can be allowed in the closed space, and it is not vacuum. The side plate 3 is arranged between the transparent cover plate 1 and the transparent bottom plate 2 along the circumference of the transparent cover plate 1 or the transparent bottom plate 2, and is located at the edge of the transparent bottom plate 2 or the transparent cover plate 1, so that the side plate 3, the transparent bottom plate 2 and the transparent cover plate 1 enclose a space, and the space and the aforementioned closed space constitute two air layers.

[0033] The spacing between the heat absorbing plates 7 matches the size of the light control unit 10 so that at different incident light angles, the infrared light in the frequency-divided sunlight is absorbed by the heat absorbing plates 7, and the visible light and ultraviolet light required for plant growth are irradiated onto the plants through the transparent portion of the transparent bottom plate 2. Preferably, the heat absorbing plates 7 are located below the groove wall of the groove, and a light control unit 10 is provided between two adjacent heat absorbing plates 7.

[0034] There is a gap 14 between two adjacent light control units 10 in the width direction of the light control units 10, and the gap 14 is connected to the circulation space in the direction from the transparent cover plate 1 to the transparent bottom plate 2, so that the frequency-divided sunlight can directly irradiate the transparent bottom plate 2. Preferably, the width of the gap 14 gradually widens in the direction from the transparent cover plate 1 to the transparent bottom plate 4.

[0035] The structure also includes: a tracking device, which is connected to the heat absorbing plate 7 and is used to drive the heat absorbing plate 7 to track the incident angle of the infrared light in the divided light, so that the heat absorbing plate 7 can move with the incident light angle to achieve the purpose of precise light splitting and light control. During tracking, the heat absorbing plate 7 can be controlled by a servo motor to move.

[0036] See also Figure 3~Figure 5The embodiment of the present invention also provides a controllable light covering system, which includes: a covering structure and a wind control device. The covering structure is the aforementioned controllable light covering structure, which covers the window of the greenhouse 9. The wind control device is connected to the covering structure, and is used to select a first wind guiding state and a second wind guiding state. The first wind guiding state is to transport the air in the circulation space of the controllable light covering structure to the outside of the greenhouse 9, that is, to discharge the heat outside the greenhouse 9, to achieve air circulation in the greenhouse, and reduce the indoor heat load, which is particularly suitable for summer; the second wind guiding state is to transport the air in the circulation space of the controllable light covering structure to the greenhouse 9, that is, to introduce the heat into the greenhouse 9, to achieve air circulation in the greenhouse, improve the insulation effect, and is particularly suitable for winter, and increase the heat utilization efficiency in winter. When used, the wind control device includes: a fan 5 and a three-way valve 7. The fan 5 is located in front of the three-way valve 7 and is connected to the circulation space of the controllable light structure, such as the aforementioned air outlet. The inlet of the three-way valve 7 is connected to the outlet of the fan 5, the first outlet of the three-way valve 7 is connected to the outdoor pipeline, and the second outlet of the three-way valve 7 is connected to the indoor pipeline. By controlling the opening or closing of the first outlet and the second outlet, the outdoor pipeline is connected to the circulation space or the indoor pipeline is connected to the circulation space. Figure 4 The first outlet of the three-way valve is opened, and the outdoor pipeline is connected to the circulation space. Figure 5 The second outlet of the three-way valve is opened to realize the connection between the outdoor pipeline and the circulation space. In other embodiments, two fans 5 and two valves may be arranged, namely the first fan and the second fan, and the first valve and the second valve. The first fan and the first valve are connected in series between the indoor pipeline and the circulation space, and the second fan and the second valve are connected in series between the outdoor pipeline and the circulation space. When the indoor pipeline is connected to the circulation space, the first fan is started and the first valve is opened, and the second fan and the second valve are closed. When the outdoor pipeline is connected to the circulation space, the second fan is started and the second valve is opened, and the first fan and the first valve are closed. The valve is preferably located in front of the fan. Since the greenhouse area is large, in order to facilitate air circulation, the number of the first fans and the number of the first valves can be multiple, and the number of the second fans and the second valves can also be multiple. Usually the greenhouse 9 is surrounded by the low side walls 91 of the greenhouse, the high side walls 92 of the greenhouse and the greenhouse soil 93, such as Figure 3 As shown, the controllable light covering structure is arranged between the high side wall 92 of the greenhouse and the low side wall 91 of the greenhouse. In this case, one controllable light covering structure is arranged. In other embodiments, the greenhouse can also be surrounded by two high side walls of the greenhouse and the greenhouse soil, such as Figure 4 and Figure 5 As shown, two controllable light covering structures can be provided at this time, and the two controllable light covering structures are provided in an inverted V shape between the two high side walls of the greenhouse.

[0037] In order to fully utilize the air, the system also includes: a wind power generation device 100, which uses the wind transmitted to the outside of the greenhouse when the wind control device is in the first wind guiding state to generate electricity, thereby improving energy utilization, such as providing lighting power for the greenhouse 9 or providing power for the operation of the fan.

[0038] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A controllable light covering structure, It is characterized in that The controllable light covering structure comprises: A transparent cover plate, comprising a plurality of light control units, wherein the plurality of light control units are interconnected to form an upper end surface of the transparent cover plate, wherein the upper end surface is a covering surface of the controllable light covering structure, and the light control units divide the frequency of sunlight based on the refraction of light so that the divided light is incident below the covering surface; and A transparent bottom plate is located below the transparent cover plate and is spaced apart from the transparent cover plate to form a circulation space, wherein the transparent bottom plate in the circulation space comprises: a mounting portion and a transparent portion, wherein the mounting portion is mounted with a heat absorbing plate for absorbing infrared light in the divided light, and the transparent portion is used for allowing the divided light to pass through; The light control unit has a groove, the groove is concave toward the transparent bottom plate, the groove mouth is in the direction of the transparent bottom plate, and the groove wall of the groove divides the frequency of sunlight based on the refraction of light; There is a gap between two adjacent light control units in the width direction of the light control units, and the gap is connected to the flow space in the direction from the transparent cover plate to the transparent bottom plate; A tracking device, connected to the heat absorbing plate, and used to drive the heat absorbing plate to track the incident angle of the infrared light in the divided light; The heat absorbing plate is located below the groove wall of the groove, and one light control unit is arranged between two adjacent heat absorbing plates.

2. The controllable light covering structure according to claim 1, It is characterized in that The transparent bottom plate is provided with a plurality of ventilation holes, and the ventilation holes are connected with the circulation space; and / or The controllable light covering structure also includes: The side plate is circumferentially arranged between the transparent cover plate and the transparent bottom plate and located at the edge of the transparent bottom plate or the transparent cover plate. The side plate is provided with an air inlet and / or an air outlet.

3. The controllable light covering structure according to claim 1, It is characterized in that The heat absorbing plate is located on the inner surface of the mounting portion, and the inner surface of the mounting portion is opposite to the transparent cover plate.

4. The controllable light covering structure according to claim 1, It is characterized in that The cross section of the inner contour of the groove is an inverted trapezoid or an inverted triangle; The thickness of the groove wall of the groove gradually increases in the direction from the transparent cover plate to the transparent bottom plate; The cross section of the outer contour of the groove is an inverted trapezoid or triangle.

5. The controllable light covering structure according to claim 1, It is characterized in that The light control unit further includes: A transparent top plate covers the notch of the groove, and both ends of the groove along the length direction of the groove are closed ends.

6. The controllable light covering structure according to claim 1, It is characterized in that The heat absorbing plate is located below the groove wall of the groove.

7. A controllable light covering system, It is characterized in that The controllable light covering system comprises: A covering structure, which is a controllable light covering structure as claimed in any one of claims 1 to 6, used for covering a window of a greenhouse; and A wind control device is connected to the covering structure and is used to selectively select a first wind guiding state and a second wind guiding state. The first wind guiding state is to transport the air in the circulation space of the controllable light covering structure to the outside of the greenhouse. The second wind guiding state is to transport the air in the circulation space of the controllable light covering structure to the inside of the greenhouse.

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