A shading device and a breeding ventilation system

Abstract

The present application belongs to the technical field of breeding ventilation equipment, and particularly relates to a light shielding device and a breeding ventilation system. The light shielding device comprises a support and at least one set of light shielding components arranged on the support. Each set of light shielding components comprises at least one light shielding blade arranged around its own axis. The light shielding blade forms an annular ventilation gap through which the airflow passes in a non-axial direction. The light shielding blade is used to form a light shielding surface in the axial direction without a straight light transmission gap, so that the light shielding device covers the inlet cross section of the fan. The problem of poor ventilation effect of the fixed light shielding device is solved. The continuous and uninterrupted light shielding coverage is formed by the projection of the light shielding blade in the axial direction, so that the external light cannot penetrate the light shielding device in the axial direction. The annular ventilation gap formed between the light shielding blades provides a flow path for the airflow. Compared with the traditional louver light shielding device, the annular air duct has higher flow rate and better air guiding effect, and the ventilation efficiency is significantly improved while reliable light shielding is achieved.

Description

Technical Field

[0001] This invention belongs to the technical field of aquaculture ventilation equipment, specifically relating to a shading device and an aquaculture ventilation system. Background Technology

[0002] In order to ensure the normal growth rhythm of poultry and livestock in breeding farms, it is usually necessary to install a shading device at the inlet of the breeding fan to block external light from entering the breeding house through the fan inlet.

[0003] Existing shading devices mostly adopt fixed louver or shading sheet structures, with the shading blades fixedly installed at the inlet of the fan, and the shading surface is formed by the overlapping or staggered arrangement of the blades.

[0004] However, this type of fixed shading device has the following problems in practical use: On the one hand, the fixed blades create significant airflow resistance at the fan inlet section, leading to a decrease in fan ventilation efficiency; on the other hand, to achieve a better shading effect, it is necessary to increase the shading area of ​​the blades or reduce the blade gap, which further increases airflow resistance, making it difficult to balance shading effect and ventilation performance. At the same time, dust easily accumulates on the surface of the fixed shading blades, making cleaning and maintenance inconvenient, and long-term use will affect both shading effect and ventilation performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, a shading device and aquaculture ventilation system are provided to solve the problem of poor ventilation effect of fixed shading devices.

[0006] On the one hand, the technical solution of the present invention to solve the above-mentioned technical problems is as follows: a light-shielding device, comprising: support; At least one set of light-shielding components is disposed on the bracket, each set of light-shielding components includes at least one light-shielding blade arranged around its own axis, the light-shielding blade forming an annular ventilation gap through which airflow passes in a non-axial direction, the light-shielding blade being used to form a light-shielding surface without a straight light-transmitting gap in the axial direction, so that the light-shielding device covers the inlet section of the fan.

[0007] Compared with existing technologies, the above technical solutions have the following beneficial effects: By arranging the shading blades around their own axis, the projection of the shading blades in the axial direction forms a continuous and uninterrupted shading coverage surface, preventing external light from penetrating the shading device in a straight line along the axial direction and entering the breeding shed. At the same time, the annular ventilation gap formed between the shading blades provides a non-axial flow path for airflow. The airflow passes through the shading device along the annular channel. Compared with the traditional louvered shading device, the annular air duct has a higher flow velocity and a better air guiding effect, thus significantly improving ventilation efficiency while achieving reliable shading.

[0008] Based on the above technical solution, the embodiments of this application can be further improved as follows: In one embodiment, the light-shielding component is rotatably mounted on the bracket about its own axis.

[0009] The light-shielding component is made rotatable, allowing it to rotate around its own axis under the action of airflow. During the rotation, the light-shielding blades can accelerate the airflow and further reduce the airflow resistance. At the same time, the centrifugal force generated by the rotation can shake off the dust accumulated on the blade surface, achieving a self-cleaning function.

[0010] In one embodiment, the bracket includes a first support member, and the light-shielding assembly is rotatably connected to the first support member.

[0011] The first support member is a solid plate structure with a first through hole corresponding to the light-shielding component. The first support member is used to seal the light leakage gap between the light-shielding components.

[0012] The first support component adopts a solid plate structure, which can effectively block light from directly penetrating through the gap between adjacent light-shielding components, complementing the light-shielding surface formed by the light-shielding blades and improving the overall light-shielding performance.

[0013] In one embodiment, a sleeve is further included, which is fitted over the outside of the light-shielding component. The sleeve is connected to the bracket, and the light-shielding component is rotatably fitted into the sleeve. The sleeve is used to seal the light-leaking gap between the light-shielding component and the bracket.

[0014] The sleeve is set around the outer periphery of the light-shielding component, providing an alternative way to install the light-shielding component. The sleeve can also seal the gap between the outer contour of the light-shielding component and the mounting hole of the bracket, preventing light from leaking out of the gap. When used with a solid plate, it can further improve the light-shielding effect.

[0015] In one embodiment, a second support member is further included, spaced apart from the first support member, to limit the rotation of the light-shielding assembly between the two supports members.

[0016] The first and second support members are located at both ends of the light-shielding assembly, respectively, providing support at both ends of the light-shielding assembly and ensuring the rotational stability and installation accuracy of the light-shielding assembly.

[0017] In one embodiment, the second support member includes a support ring corresponding to the first through hole. The support ring is snapped and fixed to the end of the sleeve. A second channel is formed at the center of the support ring, and the inner diameter of both channels is smaller than the diameter of the outer contour of the light-shielding blade.

[0018] The support ring is fixed to the end of the sleeve by a snap-fit ​​method, which makes assembly convenient and quick; the inner diameter of both channels is smaller than the outer contour diameter of the light-shielding blade, so that the light-shielding component is axially confined between the two support members and will not slip out of the channel.

[0019] In one embodiment, a support strip is provided in the through hole of the first support member and / or the second support member, and a shaft hole is provided at the center of the support strip, and the shaft core of the light-shielding component is rotatably connected to the shaft hole.

[0020] The support strip provides rotational support for the light-shielding assembly, and the support members are connected by a through hole to reduce obstruction of airflow channels. The structure is simple and easy to process.

[0021] In one embodiment, the light-shielding blade is a spiral blade formed by extending spirally along the axial direction, and its effective number of turns is not less than 1 turn.

[0022] Having at least one effective rotation ensures that, at any rotation angle, the helical blade has at least one helical section that blocks axially direct light rays. At the same time, the helical surface of the helical blade can guide the airflow and reduce airflow resistance during rotation.

[0023] The helical blades can be either shaftless or shafted to suit different installation and drive requirements.

[0024] In one embodiment, multiple light-shielding blades are arranged at circumferential intervals, and adjacent blades have a preset overlap in the axial projection direction, so that all blades form a continuous and uninterrupted light-shielding coverage surface in the circumferential direction.

[0025] By setting a preset overlap amount, even when the shading component is stationary, adjacent blades overlap each other in the axial projection, ensuring that there are no straight light transmission gaps at any angle, thus achieving reliable static shading.

[0026] On the other hand, this embodiment also discloses an aquaculture ventilation system, which includes: a fan; The aforementioned light-shielding device is installed at the air inlet of the fan.

[0027] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. By arranging the shading blades around their own axis, a shading surface without straight light-transmitting gaps is formed in the axial direction. At the same time, an annular ventilation gap is formed between the shading blades, allowing airflow to pass through in a non-axial direction. Compared with traditional louver-type shading devices, the annular air duct has a higher flow rate and better air guiding effect, thus significantly improving ventilation efficiency while achieving reliable shading. This solves the contradiction between shading effect and ventilation performance in traditional fixed shading devices.

[0028] 2. By setting the shading component to rotate around its own axis, the shading component rotates under the action of airflow. During the rotation, the shading blades dynamically guide the airflow, further reducing the airflow resistance. At the same time, the centrifugal force generated by the rotation removes the dust accumulated on the blade surface, realizing the self-cleaning function. This overcomes the defects of fixed shading blades that are easy to accumulate dust and are inconvenient to clean and maintain, and ensures the stability of shading effect and ventilation performance during long-term use.

[0029] 3. By setting the first support component of the solid plate structure to block the light leakage gap between the light-blocking components, and setting the sleeve to block the light leakage gap between the light-blocking components and the bracket, the light-blocking surface formed by the light-blocking blades in the axial direction is complementary, ensuring that light will not directly penetrate into the breeding house through the gap, which significantly improves the overall light-blocking performance.

[0030] 4. By setting the shading blades as spiral blades extending along the axial direction with an effective number of turns of not less than 1 turn, it is ensured that there is at least one spiral section blocking direct light at any rotation angle. At the same time, the spiral surface dynamically guides the airflow during rotation, further reducing airflow resistance.

[0031] 5. By arranging multiple shading blades at intervals along the circumference, and having a preset overlap between adjacent blades in the axial projection direction, all blades form a continuous and uninterrupted shading coverage surface in the circumference, so that a reliable shading effect can be achieved even when the shading assembly is in a stationary state. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0034] Figure 2 for Figure 1 A structural diagram from another perspective.

[0035] Figure 3 This is a longitudinal sectional view of the present invention.

[0036] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle.

[0037] Figure 5 for Figure 3 Enlarged structural diagram at point B.

[0038] Figure 6 for Figure 3 Enlarged structural diagram at point C.

[0039] Figure 7 This is a schematic diagram of the overall structure of the second support member in this invention.

[0040] Figure label: 1. Bracket; 11. First support member; 111. First through hole; 12. Second support member; 121. Support ring; 122. Second channel; 13. Support bar; 131. Shaft hole; 2. Shading assembly; 21. Shading blade; 211. Helical surface; 22. Shaft core; 3. Sleeve; 4. Buckle; 5. Slot. Detailed Implementation

[0041] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0042] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0043] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Example 1 like Figure 1-2 As shown, the light-shielding device provided by the present invention includes: a bracket 1 and at least one set of light-shielding components 2.

[0046] Bracket 1 is used to install at the inlet of the aquaculture fan. Bracket 1 serves as the installation base and is used to support the shading component 2.

[0047] Each of the shading components 2 includes at least one shading blade 21 arranged around its own axis. The shading blade 21 forms an annular ventilation gap through which airflow passes in a non-axial direction. The shading blade 21 is used to form a shading surface without a straight light-transmitting gap in the axial direction, so that the bracket 1 in the shading device, together with the shading component 2, covers the fan inlet section, so that external light cannot directly penetrate the shading device in the axial direction and enter the breeding room.

[0048] By arranging the shading blades 21 around their own axis, the projection of the shading blades 21 in the axial direction forms a continuous and uninterrupted shading coverage surface, preventing external light from penetrating the shading device in a straight line along the axial direction and entering the breeding house. At the same time, the annular ventilation gap formed between the shading blades 21 provides a non-axial flow path for airflow. The airflow passes through the shading device along the annular channel. Compared with the traditional louvered shading device, the annular air duct has a higher flow velocity and a better air guiding effect, thus significantly improving ventilation efficiency while achieving reliable shading.

[0049] To improve ventilation efficiency and reduce wind resistance, the light-shielding component 2 is rotatably mounted on the bracket 1 around its own axis.

[0050] The light-shielding component 2 is made rotatable, so that the light-shielding component 2 can rotate around its own axis under the action of airflow. During the rotation, the light-shielding blade 21 can accelerate the flow and further reduce the airflow resistance. At the same time, the centrifugal force generated by the rotation can shake off the dust accumulated on the blade surface, thus achieving a self-cleaning function.

[0051] The bracket 1 can be a frame type, with the light-shielding component 2 installed inside and fixed to the fan inlet by the frame. Alternatively, the bracket 1 can be a shaft type, with the light-shielding component 2 installed outside the shaft and connected to the light-shielding component 2 by the shaft. Or, the bracket 1 can be a frame with a shaft added, fixed to the target position by the frame, and connected to the light-shielding component 2 by the shaft. In other words, the bracket 1 can be connected to the light-shielding component 2 from the inside, outside, or both inside and outside.

[0052] Correspondingly, the shading blades 21 of the shading component 2 arranged around the axial direction can be fixed on the shaft or rotatably fixed on the shaft. That is, the shading component 2 can be fixed or rotatable. The rotatable shading component 2 can be rotatably connected to the shaft by setting the central axis, or it can be rotatably connected by external constraints.

[0053] In addition, the light-shielding component 2 can also be carried in the frame, or rotated in the frame, including fixed support, that is, fixed in the frame bracket 1, or rotatedly connected to the frame bracket 1 by external constraints.

[0054] The main purpose is simply to cover the inlet section of the fan with the axial projection of the light-shielding component 2, that is, to achieve light shielding through full coverage of the axial projection. The axial projection is not limited to the axial orthogonal projection. It is permissible for there to be a certain angle between the axis of the light-shielding component 2 and the inlet section, as long as they are roughly consistent. The non-axial ventilation gap formed between the blades also facilitates airflow. Moreover, the annular air duct has a higher flow velocity and better air guiding effect compared to conventional louvered light-shielding devices.

[0055] In addition, a light-shielding component 2 can be provided, that is, a circumferential light-shielding blade 21 can be used to cover the inlet of the fan. Alternatively, multiple light-shielding components 2 can be set up. By reducing the weight of each light-shielding component 2, the rotation effect of a single light-shielding component 2 can be improved.

[0056] like Figure 1 , 3 As shown, the bracket 1 includes a first support member 11, and the light-shielding component 2 is rotatably connected to the first support member 11.

[0057] A rotatable connection installation method for a light-shielding component 2 is provided by using a first support member 11. The first support member 11 is disposed on one side of the bracket 1 and is formed at the end of the light-shielding component 2 for rotatable connection.

[0058] Specifically, the first support member 11 is a solid plate structure and has a first through hole 111 corresponding to the light-shielding component 2. The first support member 11 is used to block the light leakage gap between the light-shielding components 2.

[0059] The first support member 11 adopts a solid plate structure, which can effectively block light from directly penetrating through the gap between adjacent light-shielding components 2, and complements the light-shielding surface formed by the light-shielding blades 21, thereby improving the overall light-shielding performance.

[0060] One end of the light-shielding component 2 corresponds to the first through hole 111 and can rotate around its own axis.

[0061] The number and arrangement of the first through holes 111 correspond to the number of light-shielding components 2.

[0062] In one embodiment, the first through holes 111 are arranged in a row and column matrix, so that multiple light-shielding components 2 are arranged regularly on the first support 11, covering the rectangular or square fan inlet cross section.

[0063] In another embodiment, the first through holes 111 are arranged in concentric rings or polygons to accommodate the circular or other shaped fan inlet cross-section.

[0064] like Figure 2 ,3 As shown, it also includes a sleeve 3 sleeved outside the light-shielding component 2. The sleeve 3 is connected to the bracket 1, and the light-shielding component 2 is matched in the sleeve 3. The sleeve 3 is used to seal the light leakage gap between the light-shielding component 2 and the bracket 1.

[0065] By setting a sleeve 3 in the bracket 1, another way of rotating the light-shielding component 2 is provided. Unlike the way the first support 11 is set at the end of the light-shielding component 2, the sleeve 3 is sleeved on the outside of the light-shielding component 2.

[0066] Moreover, the sleeve 3 is arranged around the outer periphery of the light-shielding component 2, which can seal the gap between the outer contour of the light-shielding component 2 and the mounting hole of the bracket 1, preventing light from leaking out from the gap. After being combined with the first support member 11, it can further improve the light-shielding effect.

[0067] The sleeve 3 and the light-shielding component 2 work together to block the light between the light-shielding component 2 and the bracket 1. The first support member 11 is set as a solid plate structure, which mainly serves to block the light between the light-blocking components 2. In this embodiment, the first support member 11 can be used alone as a solid plate structure, that is, the light-shielding component 2 is rotatably connected to the first support member 11 and corresponds to the first through hole 111 thereon. Alternatively, the sleeves 3 fixed to the bracket 1 can be connected tangentially to each other to house the light-shielding component 2 in the sleeves 3; Alternatively, the first support member 11 can be retained as a solid plate structure, and a sleeve 3 can be installed on it. The sleeve 3 can be fixed on it by welding or other fixing methods, or fixed on the first support member 11 by other integral molding methods, so as to block the light leakage gap in all directions.

[0068] The inner wall of the sleeve 3 and the outer contour of the light-shielding blade 21 are provided with a rotation gap, so that the light-shielding component 2 can rotate freely in the sleeve 3.

[0069] The difference between the inner diameter of the sleeve 3 and the outer contour diameter of the light-shielding blade 21, that is, the rotation gap, should be controlled within a suitable range. This ensures that the light-shielding component 2 can rotate freely, while avoiding excessive gap that could lead to light leakage. For example, the rotation gap can be 0.1% to 5% of the outer contour diameter of the light-shielding blade 21.

[0070] In this embodiment, a second support member 12 is also included, which is spaced apart from the first support member 11, so as to limit the rotation of the light-shielding component 2 between the two support members.

[0071] The first support member 11 and the second support member 12 are located at both ends of the light-shielding assembly 2, respectively, providing support at both ends of the light-shielding assembly 2 to ensure the rotational stability and installation accuracy of the light-shielding assembly 2.

[0072] Specifically, the second support member 12 includes a support ring 121 corresponding to the first through hole 111. The support ring 121 is snapped and fixed to the end of the sleeve 3. A second channel 122 is formed in the center of the support ring 121, and the inner diameter of both channels is smaller than the diameter of the outer contour of the light-shielding blade 21.

[0073] like Figure 5-7 As shown, the support ring 121 is fixed to the end of the sleeve 3 by a snap-fit ​​method, which makes assembly convenient and quick; the inner diameter of both channels is smaller than the outer contour diameter of the light-shielding blade 21, so that the light-shielding component 2 is axially confined between the two support members and will not slide out of the channel.

[0074] The snap-fit ​​method of the support ring 121 can be flexibly configured.

[0075] In one implementation, such as Figure 7 As shown, the outer periphery of the support ring 121 is provided with an elastic buckle 4, and the end of the sleeve 3 is provided with a corresponding groove 5. The support ring 121 is fixed to the end of the sleeve 3 by the cooperation of the elastic buckle 4 and the groove 5. During assembly, the support ring 121 can be fixed by simply pressing it into the end of the sleeve 3. The assembly is convenient and quick.

[0076] In another embodiment, the support ring 121 is fixed to the end of the sleeve 3 by a threaded connection or an interference fit.

[0077] In one embodiment, a support strip 13 is provided in the through hole of the first support member 11 and / or the second support member 12, and a shaft hole 131 is provided in the center of the support strip 13. The shaft core 22 of the light-shielding component 2 is rotatably connected to the shaft hole 131.

[0078] The support bar 13 provides rotational support for the light-shielding component 2. At the same time, the support members are connected by the support bar 13 to cross the through hole, which reduces the obstruction of the airflow channel. The structure is simple and easy to process.

[0079] The inner diameter of the second channel 122 is smaller than the diameter of the outer contour of the light-shielding blade 21, so that the light-shielding blade 21 of the light-shielding assembly 2 cannot be dislodged from the second channel 122, while the shaft core 22 or shaft portion of the light-shielding assembly 2 can be rotatably connected to the support bar 13. The inner diameter of the first through hole 111 is also smaller than the diameter of the outer contour of the light-shielding blade 21, thereby reliably confining the light-shielding assembly 2 axially between the first support member 11 and the second support member 12.

[0080] In this embodiment, the arrangement and number of support bars 13 can be flexibly selected.

[0081] In one embodiment, a support bar 13 is provided in the first through hole 111 of the first support member 11, and no support bar 13 is provided in the second channel 122 of the second support member 12. One end of the light-shielding component 2 is rotatably connected to the support bar 13 on the first support member 11 through the shaft core 22, and the other end is freely suspended or limited by the cooperation between the outer contour of the light-shielding blade 21 and the inner wall of the sleeve 3.

[0082] In another embodiment, a support bar 13 is provided in the second through hole of the second support member 12, and no support bar 13 is provided in the first channel of the first support member 11. One end of the light-shielding component 2 is rotatably connected to the support bar 13 on the second support member 12 through the shaft core 22, and the other end is freely suspended or limited by the cooperation between the outer contour of the light-shielding blade 21 and the inner wall of the sleeve 3.

[0083] In another embodiment, support bars 13 are provided in the through holes of the first support member 11 and the second support member 12, and the two end shaft cores 22 of the light-shielding component 2 are rotatably connected to the shaft holes 131 of the two support bars 13 respectively, forming a stable rotating structure supported at both ends.

[0084] Furthermore, the number of support bars 13 can be one, two, or more. For example, two support bars 13 can be used in a cross shape. A shaft hole 131 is provided at the intersection of the support bars 13, and the four fan-shaped gaps between the two support bars 13 form an airflow channel, which ensures both the rotational support of the shaft core 22 and the smooth passage of airflow. The shaft core 22 and the shaft hole 131 can be fitted with a clearance fit, or a rolling bearing can be used to further reduce frictional resistance.

[0085] In one embodiment, the light-shielding blade 21 is a spiral blade formed by spiral extension along the axial direction, and its effective number of turns is not less than 1 turn.

[0086] Having an effective number of rotations of not less than one ensures that, at any rotation angle, the helical blade has at least one helical section that blocks axially direct light rays. At the same time, the helical surface 211 of the helical blade can guide the airflow during rotation, reducing airflow resistance.

[0087] The helical blades can be either shaftless or shafted to suit different installation and drive requirements.

[0088] The shaftless helical blades are provided with shafts at both ends, and the shafts are rotatably connected to the bracket 1; The shafted helical blades are fixedly mounted on the rotating shaft, which is rotatably connected to the bracket 1 to adapt to different installation and driving requirements.

[0089] The effective number of turns of the helical blades can be adjusted according to the fan inlet size and shading requirements.

[0090] In one embodiment, the effective number of rotations of the helical blade is 1 rotation. At this time, the projection of the helical blade in the axial direction just covers the 360-degree circumferential range, which can block direct light at any rotation angle. At the same time, the guide length of the helical blade is the shortest and the airflow resistance is the smallest.

[0091] In another embodiment, the effective number of turns of the helical blade is one and a half turns, two turns, or more than two turns. The more turns there are, the longer the guiding length of the helical surface 211, the more complex the shading path, and the better the shading effect. However, the airflow resistance will also increase accordingly. In practical applications, the choice can be made based on the needs.

[0092] Specifically, the helix angle of the spiral blades can also be flexibly set. When the helix angle is too large, the guiding effect is weak and the airflow resistance is high. When the helix angle is too small, the ventilation gap is too narrow and the ventilation efficiency is low. The preferred helix angle is 15 degrees to 45 degrees.

[0093] In another embodiment, the light-shielding blades 21 are arranged in multiple pieces at intervals along the circumference, and the adjacent blades have a preset overlap in the axial projection direction, so that all the blades form a continuous and uninterrupted light-shielding coverage surface in the circumference.

[0094] By setting a preset overlap amount, even when the light-shielding component 2 is stationary, the adjacent blades overlap each other in the axial projection, ensuring that there is no straight light-transmitting gap at any angle, thus achieving reliable static light shading. At the same time, the interval between adjacent blades forms an annular ventilation gap through which airflow passes in a non-axial direction.

[0095] The specific value of the preset overlap amount can be determined comprehensively based on the shading requirements and ventilation requirements.

[0096] In one embodiment, the overlap of adjacent blades in the axial projection direction is 5% to 15% of the blade width. This overlap range ensures that there are no straight light-transmitting gaps on the shading surface, while also preserving sufficient ventilation gaps for airflow.

[0097] The number of shading blades 21 can be determined based on the diameter of the shading component 2 and the shading requirements. The more blades there are, the smaller the width of each blade, and the finer the shading coverage. In practical applications, the number of blades can be selected based on the needs.

[0098] The cross-sectional shape of the shading blade 21 can be flat, arc-shaped, or airfoil-shaped. The arc-shaped or airfoil-shaped cross-section can better guide the airflow in the non-axial direction, further reducing airflow resistance and improving the wind guiding effect.

[0099] Example 2 This embodiment also discloses an aquaculture ventilation system, which includes: a fan; The light-shielding device, as described in Embodiment 1 above, is installed at the air inlet of the fan.

[0100] This aquaculture ventilation system effectively blocks external light from entering the breeding shed while ensuring ventilation performance, meeting the lighting control requirements of the breeding site. The shading device can be fixed to the air inlet of the fan by means of frame, bolt connection, snap-fit, etc. The installation position should ensure that the axis of the shading component 2 is roughly consistent with the airflow direction of the fan, so as to give full play to the shading and air guiding effects of the shading component 2.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light-shielding device, characterized in that, include: support; At least one set of light-shielding components is disposed on the bracket, each set of light-shielding components includes at least one light-shielding blade arranged around its own axis, the light-shielding blade forming an annular ventilation gap through which airflow passes in a non-axial direction, the light-shielding blade being used to form a light-shielding surface without a straight light-transmitting gap in the axial direction, so that the light-shielding device covers the inlet section of the fan.

2. The light-shielding device according to claim 1, characterized in that, The bracket includes a first support member, and the light-shielding component is rotatably connected to the first support member.

3. The light-shielding device according to claim 2, characterized in that, The first support member is a solid plate structure with a first through hole corresponding to the light-shielding component. The first support member is used to seal the light leakage gap between the light-shielding components.

4. The light-shielding device according to claim 1, characterized in that, It also includes a sleeve fitted outside the light-shielding component, the sleeve being connected to the bracket, the light-shielding component being rotatably fitted into the sleeve, and the sleeve being used to seal the light-leaking gap between the light-shielding component and the bracket.

5. The light-shielding device according to claim 2, characterized in that, It also includes a second support member, which is spaced apart from the first support member, so as to limit the rotation of the light-shielding assembly between the two support members.

6. The light-shielding device according to claim 5, characterized in that, The second support member includes a support ring corresponding to the first through hole. The support ring is snapped and fixed to the end of the sleeve. A second channel is formed at the center of the support ring, and the inner diameter of both channels is smaller than the diameter of the outer contour of the light-shielding blade.

7. The light-shielding device according to claim 6, characterized in that, A support strip is provided in the through hole of the first support member and / or the second support member, and a shaft hole is provided in the center of the support strip. The shaft of the light-shielding component is rotatably connected to the shaft hole.

8. The light-shielding device according to claim 1, characterized in that, The light-shielding blade is a spiral blade formed by extending spirally along the axial direction, and its effective number of turns is not less than 1 turn.

9. The light-shielding device according to claim 1, characterized in that, The light-shielding blades are arranged in multiple pieces at intervals along the circumference, and adjacent blades have a preset overlap in the axial projection direction, so that all blades form a continuous and uninterrupted light-shielding coverage surface in the circumference.

10. A ventilation system for aquaculture, characterized in that, include: Fan; The light-shielding device as described in any one of claims 1-9 is disposed at the air inlet of the fan.

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