A ventilation device for the top of a crop planting greenhouse

Abstract

The utility model belongs to agricultural machinery technical field especially is a kind of ventilation device for crop planting greenhouse top, the lower end of first conduit and second conduit is fixed in the upper portion of connecting iron stand, the inside of connecting iron stand is provided with the reversing mechanism for greenhouse top inlet and outlet air reversing, the lower portion of reversing mechanism is communicated with air inlet pipe and air outlet pipe, the upper portion of reversing mechanism is communicated with first conduit and second conduit;When needing air intake, air inlet pipe is communicated with first conduit by reversing mechanism, air outlet pipe is communicated with second conduit by reversing mechanism, forming external air suction path;When needing air outlet, after reversing mechanism act, air inlet pipe is communicated with second conduit by reversing mechanism, air outlet pipe is communicated with first conduit by reversing mechanism, realize the conversion of shed air exhaust path.This design completely solves the problem that traditional ventilation device is difficult to reverse conveniently, so that single device can meet the demand of two-way ventilation of greenhouse top.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural machinery technology, specifically relating to a ventilation device for the top of a crop planting greenhouse. Background Technology

[0002] In the field of crop cultivation, greenhouses, as the core facilities for controlled-environment cultivation, directly affect crop growth through precise control of internal temperature, humidity, and gas composition. To maintain a suitable growing environment within the greenhouse, a ventilation system is an indispensable key component. Especially in the greenhouse roof area, proper airflow exchange can effectively prevent the accumulation of hot air, regulate CO2 concentration, and reduce the breeding of pests and diseases.

[0003] Currently, most ventilation devices used in greenhouse roofs employ unidirectional centrifugal or axial fans, achieving air intake or exhaust through fixed duct structures. However, these traditional devices have significant limitations: when switching ventilation modes (e.g., from exhausting humid, hot air from the greenhouse to drawing in fresh outside air), the fixed connection between the fan and duct prevents convenient switching of airflow direction. To meet bidirectional ventilation requirements, two independent fan and duct systems often need to be installed on the roof, increasing equipment costs and installation complexity, occupying more roof space, and hindering lightweight greenhouse design. Furthermore, some devices attempt to achieve directional switching by manually adjusting the fan direction, but this is cumbersome and prone to shortening equipment lifespan due to frequent start-stop cycles, making it difficult to meet the high-efficiency requirements of dynamic greenhouse environmental control.

[0004] Therefore, how to flexibly switch the direction of air inlet and outlet in a single ventilation system has become an important technical challenge to improve greenhouse ventilation efficiency and reduce operating costs. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a ventilation device for the roof of a crop greenhouse. The specific technical solution is as follows:

[0006] A ventilation device for the top of a crop greenhouse includes a centrifugal fan, an air inlet pipe installed on the side of the centrifugal fan, an air outlet pipe installed on the top of the centrifugal fan, a first conduit and a second conduit arranged above the centrifugal fan, a connecting iron frame fixed to the upper end of the air inlet and outlet pipes, the lower end of the first and second conduits fixed to the upper part of the connecting iron frame, a reversing mechanism for reversing the air intake and exhaust direction at the top of the greenhouse arranged inside the connecting iron frame, the lower part of the reversing mechanism communicating with the air inlet and outlet pipes, the upper part of the reversing mechanism communicating with the first and second conduits, and a linkage connecting pipe fitting provided between the reversing mechanism and the first conduit, and between the reversing mechanism and the second conduit.

[0007] Preferably, the reversing mechanism includes a bottom plate and a top plate arranged in parallel, a rotating component is provided between the bottom plate and the air outlet pipe, and two straight pipes and two bent pipes are welded between the bottom plate and the top plate, with the straight pipes and bent pipes located on both sides of the rotating component.

[0008] Preferably, the rotating component includes a support plate fixed to the side surface of the air outlet pipe, a bearing is installed on the upper surface of the support plate, the outer ring of the bearing is welded and fixed to the support plate, an insert rod is installed on the inner ring of the bearing, the upper end of the insert rod is fixed in a hole opened in the middle of the base plate, a retaining ring is welded to the middle of the insert rod, and the retaining ring is in contact with the lower surface of the base plate.

[0009] Preferably, the connecting pipe fitting includes a plastic connecting plate and two plastic sleeves integrally formed at both ends of the plastic connecting plate. The two plastic sleeves are respectively fitted onto the lower part of the first conduit and the second conduit. A handle is fixed to the side surface of the plastic sleeve. A magnet is fixed to the lower surface of the plastic connecting plate. When the plastic connecting plate contacts the connecting iron frame, the magnet fixes the connecting pipe fitting to the inner surface of the upper part of the connecting iron frame by magnetic force.

[0010] Preferably, the lower part of the centrifugal fan is mounted with a bracket by screws, and the four corners of the bracket are mounted with bases by screws.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. Efficiently Achieve Air Intake and Exhaust Reversal Function: Through a reversing mechanism located inside the connecting iron frame, and in conjunction with connecting fittings linked to the first and second ducts, the air intake and exhaust modes can be switched by operating the reversing mechanism and connecting fittings. When air intake is needed, the intake pipe connects to the first duct via the reversing mechanism, and the exhaust pipe connects to the second duct via the reversing mechanism, forming a path for drawing in outside air. When air exhaust is needed, after the reversing mechanism is activated, the intake pipe connects to the second duct via the reversing mechanism, and the exhaust pipe connects to the first duct via the reversing mechanism, thus changing the path for exhausting air from the greenhouse. This design completely solves the problem of inconvenient reversal in traditional ventilation devices, allowing a single device to meet the bidirectional ventilation needs of the greenhouse roof.

[0013] 2. Simplified equipment structure and reduced application costs: Compared with the traditional solution that requires two independent systems to achieve bidirectional ventilation, this device can complete the air intake and exhaust operations with a single centrifugal fan and reversing mechanism, which greatly reduces the number of equipment and installation components.

[0014] 3. Enhanced flexibility and precision in ventilation control: The integrated design of the reversing mechanism and connecting pipes ensures stability and sealing during the switching process. Whether in intake or exhaust mode, the pipe connections maintain excellent airflow efficiency. This allows greenhouse managers to adjust the ventilation direction based on real-time environmental monitoring data. For example, switching to exhaust mode to expel hot air during midday high temperatures and switching to intake mode to replenish fresh air in the early morning when crop photosynthesis is at its peak. This enables precise control of the microenvironment at the top of the greenhouse, providing more suitable conditions for crop growth.

[0015] 4. Enhanced ease of operation and equipment reliability: The linkage design of the reversing mechanism and connecting pipes reduces the number of operation steps. Only a single reversing action is needed to complete the airflow path conversion, reducing the intensity of manual operation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 This is a three-dimensional schematic diagram of the present invention.

[0018] Figure 3 This is a schematic diagram of the disassembled structure of the parts of this utility model;

[0019] Figure 4 This is a schematic diagram of the insert rod and retaining ring structure in this utility model;

[0020] Figure 5 This is a schematic diagram of the connecting pipe structure in this utility model.

[0021] Reference numerals: 1. Centrifugal fan; 2. Inlet pipe; 3. Outlet pipe; 4. Reversing mechanism; 41. Base plate; 42. Top plate; 43. Straight pipe; 44. Bend pipe; 45. Support plate; 46. Bearing; 47. Insert rod; 48. Retaining ring; 5. Connecting iron frame; 6. Connecting pipe fitting; 61. Plastic connecting plate; 62. Plastic sleeve; 63. Handle; 64. Magnet block; 7. First conduit; 8. Second conduit; 9. Support; 10. Base. Detailed Implementation

[0022] The technical solution of this utility model will now be described with reference to the accompanying drawings and embodiments.

[0023] Please see Figure 1-5This embodiment provides the following technical solution: a ventilation device for the top of a crop planting greenhouse, including a centrifugal fan 1, an air inlet pipe 2 installed on the side of the centrifugal fan 1, an air outlet pipe 3 installed on the top of the centrifugal fan 1, a first conduit 7 and a second conduit 8 arranged above the centrifugal fan 1, a connecting iron frame 5 fixed to the upper end of the air inlet pipe 2 and the air outlet pipe 3, the lower end of the first conduit 7 and the second conduit 8 fixed to the upper part of the connecting iron frame 5, a reversing mechanism 4 for reversing the air inlet and outlet of the greenhouse top arranged inside the connecting iron frame 5, the lower part of the reversing mechanism 4 communicating with the air inlet pipe 2 and the air outlet pipe 3, the upper part of the reversing mechanism 4 communicating with the first conduit 7 and the second conduit 8, and a linkage connecting pipe fitting 6 arranged between the reversing mechanism 4 and the first conduit 7 and between the reversing mechanism 4 and the second conduit 8.

[0024] In this embodiment, a reversing mechanism 4 for air intake and exhaust at the top of the greenhouse is installed inside the connecting iron frame 5. The lower part of the reversing mechanism 4 is connected to the air intake pipe 2 and the air exhaust pipe 3, and the upper part of the reversing mechanism 4 is connected to the first conduit 7 and the second conduit 8. This facilitates the following: when air is intake at the top of the greenhouse, the air intake pipe 2 is connected to the first conduit 7 through the reversing mechanism 4, and the air exhaust pipe 3 is connected to the second conduit 8 through the reversing mechanism 4; when air is exhaust at the top of the greenhouse, after the reversing mechanism 4 is reversed, the air intake pipe 2 is connected to the second conduit 8 through the reversing mechanism 4. The exhaust pipe 3 is connected to the first conduit 7 through the reversing mechanism 4, which facilitates the reversal of air intake and exhaust at the top of the greenhouse. This solves the problem that traditional ventilation devices are difficult to reverse when ventilating the top of the greenhouse, and makes it easier for the ventilation device to intake and exhaust air at the top of the greenhouse. A connecting pipe 6 is provided between the reversing mechanism 4 and the first conduit 7, as well as between the reversing mechanism 4 and the second conduit 8, so that after the reversing mechanism 4 reverses, the reversing mechanism 4 is connected to the first conduit 7 and the second conduit 8 respectively through the connecting pipe 6.

[0025] Specifically, the reversing mechanism 4 includes a bottom plate 41 and a top plate 42 arranged in parallel. A rotating component is provided between the bottom plate 41 and the air outlet pipe 3. Two straight pipes 43 and two bent pipes 44 are welded between the bottom plate 41 and the top plate 42, and the straight pipes 43 and bent pipes 44 are located on both sides of the rotating component.

[0026] In this embodiment, a reversing mechanism 4, consisting of a base plate 41, a top plate 42, straight pipes 43, bent pipes 44, and a rotating component, is used. The two straight pipes 43 and two bent pipes 44 welded between the base plate 41 and the top plate 42 are located on both sides of the rotating component. This facilitates the connection between the air inlet pipe 2 and the first conduit 7, as well as the air outlet pipe 3 and the second conduit 8, through the two straight pipes 43 when the top of the greenhouse needs to ventilate. When the top of the greenhouse needs to ventilate, the reversing mechanism 4 rotates 180 degrees around the rotating component. At this time, the air inlet pipe 2 and the second conduit 8, as well as the air outlet pipe 3 and the first conduit 7, are connected through the two bent pipes 44, enabling the top of the greenhouse to ventilate. This facilitates the ventilation device to reverse the direction of air intake and exhaust at the top of the greenhouse.

[0027] Specifically, the rotating component includes a support plate 45 fixed to the side surface of the air outlet pipe 3. A bearing 46 is installed on the upper surface of the support plate 45. The outer ring of the bearing 46 is welded and fixed to the support plate 45. An insert rod 47 is installed on the inner ring of the bearing 46. The upper end of the insert rod 47 is fixed in a hole opened in the middle of the base plate 41. A retaining ring 48 is welded to the middle of the insert rod 47, and the retaining ring 48 is in contact with the lower surface of the base plate 41.

[0028] In this embodiment, a rotating component consisting of a support plate 45, a bearing 46, a rod 47, and a retaining ring 48 is used. The support plate 45, which is welded to the side surface of the air outlet pipe 3, is welded to the outer ring of the bearing 46. The rod 47, which is installed on the inner ring of the bearing 46, is inserted into the hole in the middle of the base plate 41. At the same time, the retaining ring 48, which is welded to the middle of the rod 47, contacts the lower surface of the base plate 41. This facilitates the reversing mechanism 4 to rotate 180 degrees to achieve the reversing of air intake and exhaust when ventilating the top of the greenhouse.

[0029] Specifically, the connecting pipe fitting 6 includes a plastic connecting plate 61 and two plastic sleeves 62 integrally formed at both ends of the plastic connecting plate 61. The two plastic sleeves 62 are respectively fitted onto the lower part of the first conduit 7 and the second conduit 8. A handle 63 is fixed to the side surface of the plastic sleeve 62, and a magnet 64 is fixed to the lower surface of the plastic connecting plate 61. When the plastic connecting plate 61 contacts the connecting iron frame 5, the magnet 64 fixes the connecting pipe fitting 6 to the inner surface of the upper part of the connecting iron frame 5 by magnetic force.

[0030] In this embodiment, a connecting pipe fitting 6 is used, consisting of a plastic connecting plate 61, plastic sleeves 62, a handle 63, and a magnet 64. Two plastic sleeves 62, integrally formed at both ends of the plastic connecting plate 61, are respectively fitted onto the lower parts of the first conduit 7 and the second conduit 8. The magnet 64, fixed to the lower surface of the plastic connecting plate 61, is used for magnetic attraction and fixation when the plastic connecting plate 61 is close to the upper part of the connecting iron frame 5. When air is introduced from the top of the greenhouse, the two straight pipes 43 are located at the lower parts of the first conduit 7 and the second conduit 8, respectively. Press down the handle 63 so that one of the plastic sleeves 62 is fitted over the straight pipe 43 and the first conduit 7, and the other plastic sleeve 62 is fitted over the straight pipe 43 and the second conduit 8. When the greenhouse is venting, first move the connecting pipe 6 upward, then rotate the reversing mechanism 4 180 degrees so that the two bent pipes 44 are located below the first conduit 7 and the second conduit 8. Move the connecting pipe 6 downward so that one of the plastic sleeves 62 is fitted over the bent pipe 44 and the first conduit 7, and the other plastic sleeve 62 is fitted over the bent pipe 44 and the second conduit 8.

[0031] Specifically, a bracket 9 is installed at the lower part of the centrifugal fan 1 by screws, and a base 10 is installed at the four corners of the bracket 9 by screws.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A ventilation device for the top of a crop cultivation greenhouse, comprising a centrifugal fan (1), an air inlet pipe (2) installed on the side of the centrifugal fan (1), an air outlet pipe (3) installed on the top of the centrifugal fan (1), and a first conduit (7) and a second conduit (8) disposed above the centrifugal fan (1), characterized in that: The upper ends of the air inlet pipe (2) and the air outlet pipe (3) are fixed with connecting iron frames (5). The lower ends of the first conduit (7) and the second conduit (8) are fixed to the upper part of the connecting iron frame (5). The inner side of the connecting iron frame (5) is provided with a reversing mechanism (4) for reversing the air inlet and outlet at the top of the greenhouse. The lower part of the reversing mechanism (4) is connected to the air inlet pipe (2) and the air outlet pipe (3). The upper part of the reversing mechanism (4) is connected to the first conduit (7) and the second conduit (8). A linkage connecting pipe fitting (6) is provided between the reversing mechanism (4) and the first conduit (7) and between the reversing mechanism (4) and the second conduit (8).

2. The ventilation device for the roof of a crop greenhouse according to claim 1, characterized in that: The reversing mechanism (4) includes a bottom plate (41) and a top plate (42) arranged in parallel. A rotating component is provided between the bottom plate (41) and the air outlet pipe (3). Two straight pipes (43) and two bent pipes (44) are welded between the bottom plate (41) and the top plate (42), and the straight pipes (43) and bent pipes (44) are located on both sides of the rotating component.

3. The ventilation device for the roof of a crop planting greenhouse according to claim 2, characterized in that: The rotating component includes a support plate (45) fixed to the side surface of the air outlet pipe (3). A bearing (46) is installed on the upper surface of the support plate (45). The outer ring of the bearing (46) is welded and fixed to the support plate (45). A plug rod (47) is installed on the inner ring of the bearing (46). The upper end of the plug rod (47) is fixed in a hole opened in the middle of the base plate (41). A retaining ring (48) is welded to the middle of the plug rod (47), and the retaining ring (48) contacts the lower surface of the base plate (41).

4. The ventilation device for the top of a crop greenhouse according to claim 3, characterized in that: The connecting pipe fitting (6) includes a plastic connecting plate (61) and two plastic sleeves (62) integrally formed at both ends of the plastic connecting plate (61). The two plastic sleeves (62) are respectively fitted onto the lower part of the first conduit (7) and the second conduit (8). A handle (63) is fixed on the side surface of the plastic sleeve (62). A magnet (64) is fixed on the lower surface of the plastic connecting plate (61). When the plastic connecting plate (61) contacts the connecting iron frame (5), the magnet (64) fixes the connecting pipe fitting (6) to the inner surface of the upper part of the connecting iron frame (5) by magnetic force.

5. The ventilation device for the top of a crop greenhouse according to claim 1, characterized in that: The centrifugal fan (1) has a bracket (9) installed at its lower part by screws, and the four corners of the bracket (9) are fitted with bases (10) by screws.

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