Agricultural greenhouse air supply device

Abstract

The present application relates to the field of agricultural greenhouse planting, in particular to a kind of agricultural greenhouse air supply device, including outer shell, air inlet mechanism installed on outer shell, upper cutoff plate mechanism installed with outer shell, lower cutoff plate mechanism and excess wind elimination mechanism;Excess wind elimination mechanism includes inner tube, outer tube, connecting pipe group, inner intercepting slider assembly, outer intercepting slider assembly and pneumatic valve assembly;Air flow enters the upper end of inner tube and drives pneumatic valve assembly to rotate and enters outer tube through connecting pipe group to carry out air flow offset;Upper cutoff plate mechanism rotates and drives magnetic piece to rotate and drives cutoff slider to slide relative to positioning shell, air flow passes through the positioning shell and enters outer tube through connecting pipe group to carry out excess wind backflushing elimination.It is arranged between upper cutoff plate mechanism and lower cutoff plate mechanism through excess wind elimination mechanism, and excess wind in pipe is discharged quickly, avoids residual gas to stand for a long time, significantly shortens the response time of air supply cycle, and improves the generation frequency of vortex ring.

Description

Technical Field

[0001] This invention relates to the field of agricultural greenhouse cultivation, specifically to an agricultural greenhouse ventilation device. Background Technology

[0002] Inside agricultural greenhouses, hot air (low density and light weight) naturally rises along the curvature of the greenhouse film, eventually accumulating at the highest point. If this heat accumulates at the top and cannot escape, the temperature at the top is often several degrees higher than in the middle. The tops of crops (growing points and tender leaves) closest to the film are most susceptible to heat scorching, a phenomenon known as "leaf burn," which negatively impacts crop growth and causes economic losses. At midday, the vents at the top of the greenhouse need to be opened to allow heat to escape. However, after closing the greenhouse in the evening, on cloudy days, or at night, the soil and walls, having absorbed heat during the day, slowly release it. But as the heat rises and accumulates at the top, the crop layer cools first, causing a rapid drop in ground temperature. Therefore, forced convection is needed to maintain the greenhouse's insulation. However, conventional convection methods dissipate energy quickly, requiring higher wind speeds to reduce the temperature difference inside the greenhouse, increasing energy consumption. Furthermore, high-speed airflow is detrimental to crop growth and may cause dust problems. Therefore, while creating convection, the internal airflow speed should be minimized.

[0003] Existing technological shortcomings: Current vortex ring air supply technology is mainly in the research and development stage and has not yet been industrialized. There are two main factors restricting the industrialization of vortex ring technology: firstly, existing vortex ring air supply devices have insufficient ventilation volume, failing to meet the air exchange requirements per unit space; secondly, the airflow velocity generated by the current vortex rings is uneven, resulting in poor vortex ring quality. The current mainstream vortex ring air supply technology uses a cut-off generation method. Its main principle is to cut off the dynamic airflow into pulsed airflow through a clamp. Once the airflow starts moving, if the airflow propagation path changes, or if the air inlet area of ​​the duct changes due to the opening and closing of the cut-off plate, it will cause uneven airflow velocity within the propagation cross-section of the air supply duct. Because the cut-off vortex ring generation technology requires the duct to remain closed for a period of time after the cut-off plate closes the air supply duct, and cannot immediately open the duct, reducing this closing time is an effective way to increase the air supply volume.

[0004] The main current solutions: Current technologies for reducing shut-off time are mainly divided into two types: active and passive. The passive method involves two cut-off plates at both ends of the air supply duct. First, the cut-off plate at the outlet is closed, causing the airflow inside the duct to impact the bottom cut-off plate, losing kinetic energy. Then, the inlet cut-off plate is closed, keeping the cavity sealed. This method is simple in structure and easy to operate. However, during device operation, there is a moment when the entire air supply duct (inlet or outlet) is closed, causing the airflow blown into the fan to have nowhere to escape and can only be depressurized as ordinary air, reducing the vortex ring airflow.

[0005] The main principle of active airflow is that after the cut-off plate closes the air inlet of the upper duct, a small amount of airflow is actively blown out at an upward angle from the side wall of the duct. This airflow collides with the downward-moving airflow inside the duct, causing the gas inside the duct to quickly come to a standstill. Because the backflow only rushes upward from one or two ducts and is not a uniform backflow, the airflow settling effect is somewhat worse than that of passive airflow.

[0006] Therefore, in order to solve the above problems, an agricultural greenhouse ventilation device is proposed by organically combining active and passive technologies. Summary of the Invention

[0007] The vortex ring air supply device of the present invention, through the residual air elimination mechanism arranged between the upper and lower cut-off plate mechanisms, quickly discharges the residual air in the pipe, avoids the residual gas from remaining stagnant for a long time, significantly shortens the response time of the air supply cycle, and increases the generation frequency of the vortex ring.

[0008] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0009] An agricultural greenhouse ventilation device includes an outer shell, an air inlet mechanism mounted on the outer shell, an upper cut-off plate mechanism and a lower cut-off plate mechanism mounted in conjunction with the outer shell, and an excess air elimination mechanism disposed between the upper and lower cut-off plate mechanisms. The excess air elimination mechanism includes an inner pipe, an outer pipe, a connecting pipe assembly connecting the inner and outer pipes, an inner flow-blocking slider assembly mounted in conjunction with the inner pipe, an outer flow-blocking slider assembly mounted in conjunction with the outer pipe, and a pneumatic valve assembly mounted on the inner pipe. The inner and outer flow-blocking slider assemblies have the same structure. The inner flow-cutting slider assembly includes a positioning housing fixedly installed on the circumference of the inner tube and a cutting slider that is slidably installed inside the positioning housing and can move radially along the inner tube; the upper cutting plate mechanism is provided with a magnetic component for driving the cutting slider to extend and retract radially along the outer tube; the airflow enters the upper end of the inner tube, drives the pneumatic valve assembly to rotate, and enters the outer tube through the connecting pipe assembly to cancel the airflow; the rotation of the upper cutting plate mechanism drives the magnetic component to rotate and drives the cutting slider to slide relative to the positioning housing, and the airflow passes through the positioning housing and enters the outer tube through the connecting pipe assembly to eliminate the residual backflow.

[0010] Furthermore, the connecting pipe assembly includes a first connecting pipe, a second connecting pipe, and a third connecting pipe. The upper end of the first connecting pipe is connected to the inner flow-blocking slider assembly, and the lower end of the first connecting pipe is connected to the bottom of the outer pipe, with the air outlet direction of the lower end of the first connecting pipe being upward along the axis of the outer pipe. The second connecting pipe is connected to the upper end of the outer pipe and the upper end of the inner pipe, and the pneumatic valve assembly is used to open or close the second connecting pipe. The upper end of the third connecting pipe is connected to the outer flow-blocking slider assembly, and the lower end of the third connecting pipe is connected to the lower end of the outer pipe.

[0011] Furthermore, a driving mechanism is installed between the upper cut-off plate mechanism and the lower cut-off plate mechanism. The upper cut-off plate mechanism includes an upper docking plate that is fixedly installed with the outer shell and an upper cut-off plate that is installed with the driving mechanism. The upper cut-off plate is rotatably installed on the upper end of the upper docking plate.

[0012] Furthermore, the upper connecting plate is provided with a first inner hole and a first outer hole, and the upper truncated plate is provided with a second inner hole and a second outer hole. The second inner hole and the second outer hole are both arc-shaped waist holes. The second inner hole and the second outer hole are staggered. The second inner hole is rotatably engaged to open or close the first inner hole, and the second outer hole is rotatably engaged to open or close the first outer hole.

[0013] Furthermore, the magnetic component includes an inner magnet and an outer magnet. The second inner hole is provided with multiple second inner holes, which are evenly distributed on the same circumferential direction of the upper cut plate. An inner magnet is installed in each second inner hole. The second outer hole is provided with multiple second outer holes, which are evenly distributed on the same circumferential direction of the upper cut plate. An outer magnet is installed in each second outer hole.

[0014] Furthermore, a permanent magnet is installed on the upper end face of the cutting slider to cooperate with the inner magnet, a slider slot is provided on the side of the cutting slider, and a guide slider is provided on the inner wall of the positioning housing to cooperate with the slider slot.

[0015] Furthermore, the free end of the cut-off slider is concave and has an arc-shaped structure, and a slider intercepting groove connected to the positioning housing is formed on the cut-off slider.

[0016] Furthermore, the pneumatic valve assembly includes a pneumatic valve plate rotatably mounted on the inner tube and a counterweight block arranged at the lower end of the pneumatic valve plate. The pneumatic valve plate rotates to open or close the second connecting pipe.

[0017] Furthermore, the lower cut-off plate mechanism includes a lower connecting plate that is installed in conjunction with the outer shell, a lower cover plate that is fixedly installed at the bottom of the lower connecting plate, and a lower cut-off plate that is rotatably installed in the lower cover plate in conjunction with the drive mechanism. The lower cut-off plate has a plurality of cut-off waist holes, which can be aligned with any one of the inner tubes after rotation. The cut-off waist holes have the same shape and specifications as the second inner hole, and their starting positions in the circumferential direction are staggered from each other.

[0018] Furthermore, the drive mechanism includes a dual-axis motor fixedly mounted on the lower connecting plate. The dual-axis motor has an upper output end and a lower output end. The upper output end is installed in conjunction with the upper cut-off plate mechanism, and the lower output end is installed in conjunction with the lower cut-off plate.

[0019] This application has the following beneficial effects:

[0020] To improve airflow stability and vortex generation quality within the pipeline: When the inner pipe just opens, a localized high-speed airflow is guided to the second connecting pipe via a pneumatic valve plate. As the inner pipe is about to close, the localized high-speed airflow is guided to the first connecting pipe via an inner flow-blocking slider assembly. By guiding the localized high-speed airflow out of the inner pipe, the uniformity of airflow within the inner pipe is ultimately improved. When the outer pipe just opens, the localized high-speed airflow collides with the airflow in the second connecting pipe, reducing its velocity. As the outer pipe is about to close, the localized high-speed airflow is guided to the third connecting pipe via an outer flow-blocking slider assembly, ultimately improving the uniformity of airflow within the outer pipe.

[0021] By reducing the settling time, the airflow of the vortex ring is increased: After the lower cut-off plate closes the air outlet at the bottom of the inner tube first, the airflow impacts the lower cut-off plate, quickly consuming energy. Subsequently, the upper cut-off plate closes the inner tube, forming a sealed cavity and accelerating the settling process. After the outer tube is closed, the airflow in the third and second connecting pipes reverses and counteracts the downward-flowing airflow inside the outer tube, further consuming the gas energy inside the outer tube and accelerating the settling process.

[0022] Improve overall production efficiency: By combining active and passive methods, the static effect is improved while preventing the entire flow channel inside the device from becoming blocked when the airflow is cut off. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall invention;

[0024] Figure 2 This is a schematic diagram of the internal layout of the present invention;

[0025] Figure 3 This is a top-view exploded view of the present invention after the air intake mechanism has been removed;

[0026] Figure 4 This is a bottom-view exploded view of the present invention after the air intake mechanism has been removed;

[0027] Figure 5 This is a schematic diagram of the installation of the pneumatic valve assembly of the present invention;

[0028] Figure 6 This is a schematic diagram of the pneumatic valve assembly of the present invention in the open state;

[0029] Figure 7 This is a schematic diagram of the cut-off slider of the present invention;

[0030] Figure 8 This is a schematic diagram of airflow entering the inner tube and passing through the second connecting tube according to the present invention, wherein the arrow indicates the airflow direction;

[0031] Figure 9 This is a schematic diagram of the airflow passing through the second connecting pipe and canceling out the airflow entering the outer pipe according to the present invention;

[0032] Figure 10 This is a schematic diagram of the residual air backflow after the airflow enters the third connecting pipe of the outer pipe according to the present invention;

[0033] Figure 11 This is the sectional view of the critical point state when the cut plate is aligned with the inner and outer tubes in this invention.

[0034] Figure 12 This is an airflow cloud diagram at the critical point when the first inner hole in the cut plate of the present invention is just aligned with the inner tube.

[0035] Figure 13 This is an airflow cloud diagram showing the airflow passing through the second connecting pipe and canceling out the airflow entering the outer pipe according to the present invention;

[0036] Figure 14 This is an airflow cloud diagram showing the backflow of residual air after the airflow enters the third connecting pipe of the outer pipe according to the present invention.

[0037] The attached diagram lists the components represented by each number as follows:

[0038] 1-Outer shell,

[0039] 2-Air intake mechanism,

[0040] 3-Upper cutting plate mechanism, 31-Upper connecting plate, 311-First inner hole, 312-First outer hole, 32-Upper cutting plate, 321-Second inner hole, 322-Second outer hole,

[0041] 4-Lower cut-off plate mechanism, 41-Lower connecting plate, 42-Lower cover plate, 421-Connecting hole, 43-Lower cut-off plate, 431-Cut-off waist hole

[0042] 5-Excess air elimination mechanism; 51-Inner pipe; 52-Outer pipe; 53-Connecting pipe assembly; 531-First connecting pipe; 532-Second connecting pipe; 533-Third connecting pipe; 54-Inner intercepting slider assembly; 55-Outer intercepting slider assembly; 56-Pneumatic valve assembly; 561-Pneumatic valve plate; 562-Counterweight; 57-Positioning housing; 58-Cutting slider; 581-Sliding slot; 582-Sliding slider intercepting slot; 59-Permanent magnet.

[0043] 6-Magnetic component, 61-Inner magnet, 62-Outer magnet, 7-Drive mechanism. Detailed Implementation

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. 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 indicated technical features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] like Figures 1-4As shown in the embodiment of this application, an agricultural greenhouse ventilation device is provided, including an outer shell 1, an air inlet mechanism 2 installed on the outer shell 1, an upper cut-off plate mechanism 3 and a lower cut-off plate mechanism 4 installed in conjunction with the outer shell 1, and an excess air elimination mechanism 5 disposed between the upper cut-off plate mechanism 3 and the lower cut-off plate mechanism 4; the excess air elimination mechanism 5 includes an inner pipe 51 and an outer pipe 52 installed between the upper cut-off plate mechanism 3 and the lower cut-off plate mechanism 4, a connecting pipe assembly 53 connecting the inner pipe 51 and the outer pipe 52, an inner flow-blocking slider assembly 54 installed in conjunction with the inner pipe 51, an outer flow-blocking slider assembly 55 installed in conjunction with the outer pipe 52, and a pneumatic valve assembly 56 installed on the inner pipe 51.

[0049] The inner flow-cutting slider assembly 54 has the same structure as the outer flow-cutting slider assembly 55. The inner flow-cutting slider assembly 54 includes a positioning housing 57 fixedly installed on the circumferential direction of the inner tube 51 (which can be understood as the circumferential direction if the inner tube is rectangular or other shapes) and a cutting slider 58 slidably installed in the positioning housing 57 and movable in the radial direction of the inner tube. The upper cutting plate mechanism 3 is provided with a magnetic component 6 for driving the cutting slider 58 to extend and retract in the radial direction of the outer tube 52.

[0050] The airflow enters the upper end of the inner tube 51, driving the pneumatic valve assembly 56 to rotate and enters the outer tube 52 through the connecting pipe group 53 to cancel the airflow; the upper cut-off plate mechanism 3 rotates, driving the magnetic component 6 to rotate and driving the cut-off slider 58 to slide relative to the positioning housing 57. The airflow passes through the positioning housing 57 and enters the outer tube 52 through the connecting pipe group 53 to eliminate the residual backflow.

[0051] The vortex ring air supply device provided by the present invention quickly discharges the residual air in the pipe by means of the residual air elimination mechanism 5 arranged between the upper cut-off plate mechanism 3 and the lower cut-off plate mechanism 4, avoiding the residual gas from remaining stagnant for a long time, significantly shortening the response time of the air supply cycle and increasing the generation frequency of the vortex ring.

[0052] In this embodiment, as Figures 5-7 As shown, the connecting pipe assembly 53 includes a first connecting pipe 531, a second connecting pipe 532, and a third connecting pipe 533. The upper end of the first connecting pipe 531 is connected to the inner flow-blocking slider assembly 54, and the lower end of the first connecting pipe 531 is connected to the bottom of the outer pipe 52, with the air outlet direction of the lower end of the first connecting pipe 531 being upward along the axis of the outer pipe 52. The second connecting pipe 532 is connected to the upper end of the outer pipe 52 and the upper end of the inner pipe 51. The pneumatic valve assembly 56 is used to open or close the second connecting pipe 532. The upper end of the third connecting pipe 533 is connected to the outer flow-blocking slider assembly 55, and the lower end of the third connecting pipe 533 is connected to the lower end of the outer pipe 52.

[0053] like Figure 5-7As shown, the inner tube 51 is divided into two sections, with the upper section being a square tube and the lower section a round tube for better coordination with other components; the outer tube 52 is a round tube. The connecting tube assembly 53 consists of three connecting tubes. The upper end of the first connecting tube 531 is fixedly installed with the inner flow-blocking slider assembly 54 to transport the gas trapped by the inner flow-blocking slider assembly 54. The lower end of the first connecting tube 531 is connected to the lower end of the outer tube 52, and the lower outlet end of the first connecting tube 531 is inclined upward relative to the vertical direction. This arrangement facilitates the upward spraying of the output gas to eliminate residual gas inside the outer tube 52.

[0054] The second connecting pipe 532 is correspondingly connected at the upper end of the inner pipe 51 and the outer pipe 52. At the same horizontal height as the first connecting pipe 531, the other end of the second connecting pipe 532 is connected to the upper side wall of the outer pipe 52, and the direction of the access end is also upward.

[0055] The end of the external flow interceptor slider assembly 55 is connected to a third connecting pipe 533. The other end of the third connecting pipe 533 is connected to the lower side wall of the outer pipe 52. The access end faces upward, and the access end is at the same horizontal height as the access end of the first connecting pipe 531 on the outer pipe 52. This arrangement facilitates the rapid elimination of residual airflow in the outer pipe by the airflow introduced by the inner or outer pipe, thus preventing residual gas from remaining stagnant for a long time.

[0056] In this embodiment, a driving mechanism 7 is installed between the upper cutting plate mechanism 3 and the lower cutting plate mechanism 4. The upper cutting plate mechanism 3 includes an upper docking plate 31 that is fixedly installed with the outer shell 1 and an upper cutting plate 32 that is installed with the driving mechanism 7. The upper cutting plate 32 is rotatably installed on the upper end of the upper docking plate 31.

[0057] like Figure 3 As shown, an excess air elimination mechanism 5 and a drive mechanism 7 are arranged between the upper cut-off plate mechanism 3 and the lower cut-off plate mechanism 4. The drive mechanism 7 is used to drive the upper cut-off plate mechanism 3 and the lower cut-off plate mechanism 4 to rotate. The upper cut-off plate mechanism 3 includes an upper docking plate 31 and an upper cut-off plate 32. The upper docking plate 31 is fixedly installed with the outer shell 1, and the upper cut-off plate 32 rotates by the input power provided by the drive mechanism 7. The rotation of the upper cut-off plate 32 is used to open or close the opening on the upper docking plate 31.

[0058] In this embodiment, the upper connecting plate 31 is provided with a first inner hole 311 and a first outer hole 312, and the upper cutting plate 32 is provided with a second inner hole 321 and a second outer hole 322. The second inner hole 321 is rotatably engaged to open or close the first inner hole 311, and the second outer hole 322 is rotatably engaged to open or close the first outer hole 312.

[0059] like Figure 3 As shown, the upper cut-off plate 32 has two types of waist-shaped openings, and multiple of each type are evenly distributed along the same circumferential direction. The corresponding upper connecting plate 31 has a first inner hole 311 and a first outer hole 312. The first inner hole 311 and the first outer hole 312 are respectively installed with the inner tube 51 and the outer tube 52. At the same time, the second inner hole 321 and the second outer hole 322 on the upper cut-off plate 32 periodically open and close in conjunction with the first inner hole 311 and the first outer hole 312 when rotating.

[0060] In this embodiment, the magnetic component 6 includes an inner magnet 61 and an outer magnet 62. Multiple second inner holes 321 are provided and evenly distributed along the same circumferential direction of the upper cut-off plate 32. An inner magnet 61 is installed in each of the second inner holes 321. Similarly, multiple second outer holes 322 are provided and evenly distributed along the same circumferential direction of the upper cut-off plate 32. An outer magnet 62 is installed in each of the second outer holes 322.

[0061] like Figure 3 As shown, the magnetic component 6 uses a magnet as the source of attraction for the cut-off slider 58. An inner magnet 61 is installed in the hole of the second inner hole 321, and an outer magnet 62 is installed in the corresponding second outer hole 322. After the inner magnet 61 rotates to the corresponding position, it can pull the cut-off slider 58 out of the positioning housing 57 and push it back, so as to achieve a periodic cut-off effect.

[0062] In this embodiment, a permanent magnet 59 is installed on the upper end face of the cutting slider 58 to cooperate with the inner magnet 61, a sliding groove 581 is provided on the side of the cutting slider 58, and a guide slider is provided on the inner wall of the positioning housing 57 to cooperate with the sliding groove 581.

[0063] like Figure 5-8 As shown, the upper surface of the cut-off slider 58 is provided with a mounting groove for positioning and installing the permanent magnet 59, facilitating its use with the inner magnet 61. The corresponding outer cut-off slider also adopts the same structural form. Sliding slots 581 are provided on both sides of the cut-off slider 58, and corresponding guide sliders are provided on the inner wall of the positioning housing 57, forming a sliding fit between the slider and the slot, which facilitates the extension of the cut-off slider 58 to intercept airflow.

[0064] In this embodiment, the free end of the cut-off slider 58 (i.e. Figure 7 The front end of the middle section is concave and has an arc-shaped structure. The cutting slider 58 has a slider intercepting groove 582 that connects to the positioning housing 57.

[0065] like Figure 6-8As shown, both the cutting-off slider 58 and the positioning housing 57 are rectangular in shape. The positioning housing 57 is a box-shaped structure that is fixedly installed to fit the inner tube. The cutting-off slider 58 has a slider intercepting groove 582 structure formed after machining on its upper end surface. When the cutting-off slider 58 slides out of the positioning housing 57, the airflow is introduced into the positioning housing 57 through the slider intercepting groove 582 and discharged through the first connecting pipe 531. The end of the cutting-off slider 58 is concave and arc-shaped, so that when it is retracted, it does not affect the normal flow of airflow along the inner tube 51.

[0066] In this embodiment, the pneumatic valve assembly 56 includes a pneumatic valve plate 561 rotatably mounted on the inner tube 51 and a counterweight 562 arranged at the lower end of the pneumatic valve plate 561. The pneumatic valve plate 561 is rotated to open or close the second connecting pipe 532.

[0067] like Figures 5-7 As shown, a mounting opening is provided on one side of the square tube section of the inner tube 51 and below the second connecting tube 532. The mounting opening is on the same side as the second connecting tube 532. A pneumatic valve plate 561 is rotatably installed in the mounting opening via a shaft. One end of the pneumatic valve plate 561 is located outside the square tube section, which is the end (i.e., the lower end) and has a counterweight 562 at the end. The other end has a vertical section that can cover the air inlet of the second connecting tube 532. Under normal conditions, due to the gravity of the counterweight 562, the vertical section is nearly parallel to the inner wall of the square tube section, with a certain gap between them. When the second inner hole 321 is just aligned with the inner tube 51, air enters this gap. The air causes the pneumatic valve plate 561 to rotate, widening the gap and allowing some air to be intercepted by the valve plate before entering the second connecting tube 532 and finally into the outer tube 52.

[0068] In this embodiment, the lower cut-off plate mechanism 4 includes a lower connecting plate 41 that is installed in conjunction with the outer shell 1, a lower cover plate 42 that is fixedly installed at the bottom of the lower connecting plate 41, and a lower cut-off plate 43 that is rotatably installed in the lower cover plate 42 in conjunction with the driving mechanism 7.

[0069] like Figure 3-4As shown, a lower cover plate 42 is concentrically fixed to the bottom of the lower connecting plate 41. The lower cover plate 42 has four connecting holes 421, each corresponding to one of the four inner connecting holes of the lower connecting plate 41. A lower cut-off plate 43 is coaxially arranged inside the lower cover plate 42, covering all the connecting holes 421. Four cut-off waist holes 431 are provided on the lower cover plate 42, which can be rotated to align with or offset from any of the connecting holes 421. The cut-off waist holes 431 on the lower cut-off plate 43 have the same shape and specifications as the second inner hole 321 on the upper cut-off plate 32, but their starting positions in the circumferential direction are offset by 5° to 10°. This offset arrangement ensures that when the lower cut-off plate 43 opens the lower end of the inner tube 51, the upper cut-off plate 32 has not yet opened the upper end of the inner tube 51, thus delaying the opening time slightly, and vice versa.

[0070] In this embodiment, the driving mechanism 7 includes a dual-axis motor fixedly mounted on the lower docking plate 41. The dual-axis motor has an upper output end and a lower output end. The upper output end is installed in conjunction with the upper cut-off plate mechanism 3, and the lower output end is installed in conjunction with the lower cut-off plate 43.

[0071] A dual-axis motor, i.e., a drive mechanism 7, is fixed at the center of the top surface of the lower docking plate 41. The lower output shaft of the dual-axis motor passes through the center of the lower docking plate 41 and is fixedly connected to the axis of the lower cut plate 43. The upper output shaft of the dual-axis motor passes through the center of the upper docking plate 31 and is fixedly connected to the axis of the upper cut plate 32. The dual-axis motor can synchronously drive the lower cut plate 43 and the upper cut plate 32 to rotate.

[0072] The overall workflow is as follows:

[0073] When the air intake mechanism 2 starts operating, it continuously draws ambient air into the internal cavity of the outer shell 1. Then, the dual-axis motor is started, which synchronously drives the lower cut-off plate 43 and the upper cut-off plate 32 to rotate at a constant speed around the same axis. Because there is a 5°~10° misalignment between the cut-off waist hole 431 of the lower cut-off plate 43 and the second inner hole 321 of the upper cut-off plate 32, the lower end of the inner tube 51 will open first and the upper end will open later, and the lower end will close first and the upper end will close later, resulting in an alternating opening and closing sequence. At the same time, there is also a certain angle difference between the second inner hole 321 and the second outer hole 322 of the upper cut-off plate 32.

[0074] In the initial state, the cut-off hole 431 of the lower cut-off plate 43 fully opens the inner tube 51. Under the action of the drive mechanism 7, when the upper cut-off plate 32 rotates until the second inner hole 321 initially overlaps with the first inner hole 311 of the upper connecting plate 31, a narrow air inlet opens at the upper end of the inner tube 51. When the gas passes through the narrow air inlet, a local high-speed airflow is generated. This high-speed airflow will cause uneven airflow velocity in the pipe, thereby reducing the mass generated by the vortex ring. Figure 12As shown, the color blocks on the left side of the figure are the velocity cloud map legend, used to indicate the velocity magnitudes corresponding to different colors in the flow field on the right. This legend is presented as vertical color bars, from 0.00e+00m / s at the bottom to 5.00e+00m / s at the top. (The rest of the text is incomplete and likely refers to further details about the legend.) Figure 13-14 Similarly, the pneumatic valve plate 561 is then pushed to rotate against the gravity of the counterweight 562, causing the vertical section of the valve plate to rotate and open. Part of the airflow is guided through the second connecting pipe 532 to the upper end of the outer pipe 52, as shown below. Figure 8 As shown. Subsequently, the second outer hole 322 opens the outer tube, and the gas passes through the narrow air inlet of the outer tube 52, generating a local high-speed airflow. This airflow collides with the airflow ejected through the second connecting pipe 532, thereby reducing the flow velocity and alleviating the problem of uneven flow velocity at this stage, as shown. Figure 9 and Figure 13 As shown. At this time, the rotational speed of the drive mechanism 7 is matched with the speed of the airflow passing through the second connecting pipe 532. The specific principle is as follows: the time for the airflow to propagate from the second connecting pipe 532 to the outer pipe 52 is T1. There is a certain angle between the second inner hole 321 and the second outer hole 322, and the time for the drive mechanism 7 to rotate through this angle is T2. Therefore, there is a time difference between the opening of the inner pipe 51 and the outer pipe 52. They open sequentially, and when T1 and T2 are equal, the working requirements are met. At this time, during the opening stage of the inner pipe 51 and the outer pipe 52, the local high-speed airflow is guided away and collides with each other, thereby ensuring that the airflow speed during the opening stage of the inner pipe 51 and the outer pipe 52 is not much different from that after they are fully opened, thus improving the uniformity of the airflow.

[0075] When the inner tube 51 and the outer tube 52 are fully open, the uniform airflow passes through the pipe and is cut off by the upper cut-off plate 32, after which a stable vortex ring will be ejected from the pipe.

[0076] When the cut-off plate begins to close the air supply duct, the lower cut-off plate 43 will close the air outlet at the bottom of the inner tube 51 first. At this time, the airflow in the inner tube 51 will impact the lower cut-off plate 43, resulting in a significant loss of energy. Subsequently, the upper cut-off plate 32 gradually closes the air inlet of the inner tube 51. At this time, the inner magnet 61 gradually approaches the cut-off slider 58 of the inner cut-off slider assembly 54, and the outer magnet 62 gradually approaches the cut-off slider 58 of the outer cut-off slider assembly 55. Since the magnetic force decreases significantly with distance, when the second inner hole 321 and the second outer hole 322 have not closed 60% of the ventilation area of ​​the inner tube 51 and the outer tube 52, the magnetic force generated by the inner magnet 61 and the outer magnet 62 on the cut-off slider 58 is lower than the frictional force. Therefore, when the closed area is greater than 60%, the magnetic force is greater than the frictional force. At this time, under the action of the magnetic force, the inner and outer cut-off sliders will be pulled. At this point, the upper cut-off plate 32 and the upper part of the inner tube 51 form a narrow air inlet, where the gas forms a local high-speed airflow. Under the guidance of the cut-off slider 58, this airflow flows sequentially through the positioning housing 57 and the first connecting pipe 531 before entering the lower end of the outer tube 52 and flowing out obliquely upwards. Simultaneously, the upper cut-off plate 32 and the upper part of the outer tube form a narrow air inlet, where the gas forms a local high-speed airflow. Under the guidance of the cut-off slider 58, this local high-speed airflow in the outer tube flows sequentially through the inner cavity of the outer cut-off slider and the third connecting pipe 533, then flows upwards and backflush into the lower end of the outer tube 52, flowing out obliquely upwards. The backflush airflow collides with the downward residual airflow in the outer tube 52. Figure 10 and Figure 14 As shown. The specific principle is as follows: the localized high-speed airflow in the inner tube 51 passes through the first connecting tube 531 for a time T3, and the localized high-speed airflow in the outer tube 52 passes through the third connecting tube 533 for a time T4. Since the first connecting tube 531 and the third connecting tube 533 have different lengths, this effect can be achieved when the time difference T4-T3 is equal to T2. This design can quickly consume the gas energy inside the outer tube 52, reducing the settling time.

[0077] As the upper and lower cut-off plates continue to rotate, the magnetic component 6 (including the inner magnet 61 and the outer magnet 62) will push the inner and outer cut-off sliders back. When the upper cut-off plate completely closes the pipe, the magnetic component 6 returns to its initial position. When the upper cut-off plate continues to rotate and move, the distance between the two increases because the magnetic component 6 cannot continue to move, waiting for the next opening and closing of the cut-off plate to enter a new round of air supply cycle.

[0078] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0079] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An agricultural greenhouse ventilation device, characterized in that: It includes an outer shell (1), an air inlet mechanism (2) installed on the outer shell (1), an upper cut-off plate mechanism (3) and a lower cut-off plate mechanism (4) installed in conjunction with the outer shell (1), and an excess air elimination mechanism (5) disposed between the upper cut-off plate mechanism (3) and the lower cut-off plate mechanism (4). The residual air elimination mechanism (5) includes an inner tube (51), an outer tube (52) installed between the upper cut-off plate mechanism (3) and the lower cut-off plate mechanism (4), a connecting pipe assembly (53) connecting the inner tube (51) and the outer tube (52), an inner flow blocking slider assembly (54) installed in conjunction with the inner tube (51), an outer flow blocking slider assembly (55) installed in conjunction with the outer tube (52), and a pneumatic valve assembly (56) installed on the inner tube (51). The inner flow-blocking slider assembly (54) has the same structure as the outer flow-blocking slider assembly (55). The inner flow-blocking slider assembly (54) includes a positioning housing (57) fixedly installed in the circumferential direction of the inner tube (51) and a cutting slider (58) that is slidably installed in the positioning housing (57) and can move in the radial direction of the inner tube (51). The upper cutting plate mechanism (3) is provided with a magnetic component (6) for driving the cutting slider (58) to extend and retract in the radial direction of the outer tube (52). The airflow enters the upper end of the inner tube (51), driving the pneumatic valve assembly (56) to rotate and enters the outer tube (52) through the connecting pipe assembly (53) to cancel the airflow; the upper cut-off plate mechanism (3) rotates, driving the magnetic component (6) to rotate and driving the cut-off slider (58) to slide relative to the positioning housing (57). The airflow passes through the positioning housing (57) and enters the outer tube (52) through the connecting pipe assembly (53) to eliminate the residual air backflow.

2. The agricultural greenhouse ventilation device according to claim 1, characterized in that: The connecting pipe assembly (53) includes a first connecting pipe (531), a second connecting pipe (532), and a third connecting pipe (533); The upper end of the first connecting pipe (531) is connected to the inner flow blocking slider assembly (54), the lower end of the first connecting pipe (531) is connected to the bottom of the outer pipe (52), and the air outlet direction of the lower end of the first connecting pipe (531) is upward along the axis of the outer pipe (52); The second connecting pipe (532) is connected to the upper end of the outer pipe (52) and the upper end of the inner pipe (51), and the pneumatic valve assembly (56) is used to open or close the second connecting pipe (532); The upper end of the third connecting pipe (533) is connected to the outer intercepting slider assembly (55), and the lower end of the third connecting pipe (533) is connected to the lower end of the outer pipe (52).

3. The agricultural greenhouse ventilation device according to claim 1, characterized in that: A drive mechanism (7) is installed between the upper cut-off plate mechanism (3) and the lower cut-off plate mechanism (4). The upper cut-off plate mechanism (3) includes an upper docking plate (31) that is fixedly installed in conjunction with the outer shell (1) and an upper cut-off plate (32) that is installed in conjunction with the drive mechanism (7). The upper cut-off plate (32) is rotatably installed on the upper end of the upper docking plate (31).

4. The agricultural greenhouse ventilation device according to claim 3, characterized in that: The upper connecting plate (31) is provided with a first inner hole (311) and a first outer hole (312), and the upper cutting plate (32) is provided with a second inner hole (321) and a second outer hole (322). The second inner hole (321) and the second outer hole (322) are both arc-shaped waist holes, and the second inner hole (321) and the second outer hole (322) are staggered. The second inner hole (321) is rotatably engaged to open or close the first inner hole (311), and the second outer hole (322) is rotatably engaged to open or close the first outer hole (312).

5. The agricultural greenhouse ventilation device according to claim 4, characterized in that: The magnetic component (6) includes an inner magnet (61) and an outer magnet (62); The second inner hole (321) is provided in multiple ways and the multiple second inner holes (321) are evenly distributed in the same circumferential direction of the upper cut plate (32). An inner magnet (61) is installed in each of the second inner holes (321). The second outer hole (322) is provided in multiple ways and the multiple second outer holes (322) are evenly distributed in the same circumferential direction of the upper cut plate (32). An outer magnet (62) is installed in each of the second outer holes (322).

6. The agricultural greenhouse ventilation device according to claim 5, characterized in that: The upper end face of the cut-off slider (58) is equipped with a permanent magnet (59) for use with the inner magnet (61), the side of the cut-off slider (58) is provided with a sliding groove (581), and the inner wall of the positioning housing (57) is provided with a guide slider for use with the sliding groove (581).

7. The agricultural greenhouse ventilation device according to claim 6, characterized in that: The free end of the cut-off slider (58) is concave and has an arc-shaped structure. A slider cut-off groove (582) that connects to the positioning housing (57) is formed on the cut-off slider (58).

8. The agricultural greenhouse ventilation device according to claim 2, characterized in that: The pneumatic valve assembly (56) includes a pneumatic valve plate (561) rotatably mounted on an inner tube (51) and a counterweight (562) disposed at the lower end of the pneumatic valve plate (561). The pneumatic valve plate (561) is rotatably used to open or close the second connecting pipe (532).

9. The agricultural greenhouse ventilation device according to claim 4, characterized in that: The lower cut-off plate mechanism (4) includes a lower connecting plate (41) installed in conjunction with the outer shell (1), a lower cover plate (42) fixedly installed at the bottom of the lower connecting plate (41), and a lower cut-off plate (43) rotatably installed in the lower cover plate (42) in conjunction with the drive mechanism (7). The lower cut-off plate (43) has multiple cut-off waist holes (431). After rotation, the cut-off waist holes (431) can be aligned with any one of the inner tubes (51). The cut-off waist holes (431) have the same shape and specifications as the second inner hole (321), and their starting positions in the circumferential direction are staggered.

10. The agricultural greenhouse ventilation device according to claim 9, characterized in that: The drive mechanism (7) includes a dual-axis motor fixedly mounted on the lower docking plate (41). The dual-axis motor has an upper output end and a lower output end. The upper output end is installed in conjunction with the upper cut-off plate mechanism (3), and the lower output end is installed in conjunction with the lower cut-off plate (43).

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