Nutrient solution oxygenation device
By combining air supply and spraying devices in the greenhouse, directional contact between nutrient solution and fresh air is achieved, solving the problem of uneven oxygenation of nutrient solution, increasing dissolved oxygen content in water and controlling temperature, and effectively alleviating root hypoxia.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ACADEMY OF PLANNING & DESIGNING OF THE MINIST OF AGRI
- Filing Date
- 2025-09-08
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional nutrient solution oxygenation methods result in uneven oxygenation, especially during the high temperatures of summer when the saturated dissolved oxygen level drops sharply, leading to prominent root hypoxia problems.
Fresh air is supplied to the greenhouse using an air supply device, which forms a directional airflow through the air duct. Combined with a spray device, nutrient solution is sprayed out of the air duct and comes into contact with the air, forming counter-current or forward convection to achieve full contact between air and liquid, thereby increasing oxygen and cooling the temperature.
It significantly increases the dissolved oxygen content of the nutrient solution, alleviates root hypoxia, and prevents nutrient solution leakage through closed-loop circulation, while controlling the nutrient solution temperature within a suitable range.
Smart Images
Figure CN224583930U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nutrient solution cultivation technology, and in particular to a nutrient solution oxygenation device. Background Technology
[0002] Hydroponics, also known as nutrient solution cultivation, utilizes modern biochemical principles to allow ordinary plants to grow in water for an extended period, completing a plant's life cycle. Hydroponics is not limited by land, time, or space; it only requires preparing a suitable nutrient solution based on the plant's growth characteristics to meet its needs. Hydroponics offers advantages such as cleanliness, environmental friendliness, hygiene, convenience, and speed. The growth environment of hydroponically grown plants is easily controlled, and it has significant advantages over traditional soil cultivation techniques, particularly in areas such as root development, plant nutrition, and mineral element absorption and utilization.
[0003] The temperature of the nutrient solution and the dissolved oxygen content are closely related to the growth of plant roots. For example, the suitable nutrient solution temperature for hydroponically grown lettuce is 18~22℃, and the dissolved oxygen content is 4~5mg / L. In the summer, when the temperature of the nutrient solution exceeds 30℃, the saturated dissolved oxygen content will drop to 50% of that at 0℃. Without oxygen supplementation, the plant roots are directly immersed in the nutrient solution, and hypoxia is likely to occur around the roots, affecting root respiration and causing root death in severe cases. Therefore, it is necessary to adjust the greenhouse environment in a timely manner to control the temperature of the nutrient solution and the dissolved oxygen content within a reasonable range.
[0004] However, traditional oxygenation methods such as bottom aeration and fixed spraying can easily lead to large differences in dissolved oxygen in the nutrient solution, making it impossible to achieve uniform oxygen supply throughout the entire area. In particular, the saturated dissolved oxygen level drops sharply during the high temperatures of summer, resulting in prominent root hypoxia problems. Utility Model Content
[0005] This invention provides a nutrient solution oxygenation device to solve the problem of uneven oxygenation in the nutrient solution in the prior art.
[0006] This utility model provides a nutrient solution oxygenation device, installed in a greenhouse, comprising: Nutrient solution tank; An air supply device is installed at the top of the greenhouse, with the air outlet of the air supply device facing inwards into the greenhouse. The air duct has one end connected to the air outlet of the air supply device for supplying fresh air; the other end corresponds to the nutrient solution pool. A spraying device is installed in the air duct. The spraying device is connected to the nutrient solution tank through a pumping pipeline. It is used to send the nutrient solution in the nutrient solution tank to the inside of the air duct for spraying, so that the nutrient solution can fully contact the fresh air in the air duct before falling into the nutrient solution tank.
[0007] The nutrient solution oxygenation device provided by this utility model also includes a support frame, which is disposed between the spray device and the nutrient solution tank. The top of the support frame is connected to the spray device, and the bottom of the support frame is connected to the tank wall or bottom of the nutrient solution tank.
[0008] According to the nutrient solution oxygenation device provided by this utility model, the spraying device includes: Rotary joint; A riser is vertically installed on the top of the support. One end of the riser is connected to the pumping pipeline, and the other end is connected to the fixed end of the rotary joint. A multi-port connector includes a main interface and multiple branch interfaces. The main interface is connected to the movable end of the rotary joint. The multiple branch interfaces are distributed circumferentially along the main interface, and each branch interface is connected to a spray pipe. The side wall of the spray pipe is provided with multiple spray holes.
[0009] According to the nutrient solution oxygenation device provided by this utility model, the end of the spray pipe away from the branch interface is closed, and the spray pipe is set perpendicular to the riser, or the spray pipe and the riser have an inclined angle.
[0010] According to the nutrient solution oxygenation device provided by this utility model, the spray holes are provided in multiple sets, and the multiple spray holes in each set are spaced apart along the axial direction of the spray pipe, and the multiple sets of spray holes are arranged around the axis of the spray pipe.
[0011] According to the nutrient solution oxygenation device provided by this utility model, the pumping pipeline includes: The liquid supply pipeline has one end connected to the nutrient solution tank and the other end connected to the port of the riser. A water pump, installed in the supply pipeline, is used to pump the nutrient solution from the nutrient solution tank to the spray pipe.
[0012] According to the nutrient solution oxygenation device provided by this utility model, the air supply device is a circulating fan, the air inlet of the circulating fan is located outside the greenhouse, and the air outlet of the circulating fan is sealed to the end of the air duct.
[0013] According to the nutrient solution oxygenation device provided by this utility model, the air duct is arranged vertically, the first end of the air duct is connected to the air outlet of the air supply device, and the second end of the air duct faces the nutrient solution pool.
[0014] According to the nutrient solution oxygenation device provided by this utility model, the inlet of the water pump is covered with a filter screen.
[0015] According to the nutrient solution oxygenation device provided by this utility model, the diameter of the spray hole is 2-5mm, and the center distance between two adjacent spray holes in each group is 8-15mm.
[0016] This invention provides a nutrient solution oxygenation device that supplies fresh air to a greenhouse via a ventilation system and forms a directional airflow channel through a duct to prevent air diffusion and loss within the greenhouse, thereby achieving directional airflow to the top of the nutrient solution tank. By embedding the spray device inside the duct, it prevents contact with dust and other impurities in the greenhouse, thus avoiding contamination of the nutrient solution. The nutrient solution sprayed by the spray device is distributed in the form of mist or small droplets in the duct, forming counter- or forward convection contact with the directional airflow, fully absorbing oxygen from the air. This significantly increases the dissolved oxygen content of the nutrient solution as it falls into the nutrient solution tank, effectively alleviating root hypoxia caused by high summer temperatures. Furthermore, after the nutrient solution sprayed by the spray device undergoes gas-liquid contact within the duct, it can fall directly to the corresponding nutrient solution tank below, and can be pumped back into the duct for gas-liquid contact again, forming a closed-loop cycle of spraying-contact-recovery, with no nutrient solution leakage or loss. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of a nutrient solution oxygenation device provided in an embodiment of this utility model.
[0019] Figure 2 This is a schematic diagram of the structure of the spraying device provided in this embodiment of the utility model.
[0020] Figure label: 1. Nutrient solution tank; 2. Air supply device; 3. Air duct; 4. Spraying device; 5. Support frame; 6. Water pump; 41. Rotary joint; 42. Riser; 43. Spray pipe; 44. Spray hole. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0022] The following is combined Figures 1-2 This invention describes a nutrient solution oxygenation device.
[0023] like Figure 1 As shown, this utility model embodiment provides a nutrient solution oxygenation device, installed in a greenhouse, including: a nutrient solution tank 1, an air supply device 2, an air duct 3, and a spraying device 4. The air supply device 2 is installed at the top of the greenhouse, with its outlet facing inwards. One end of the air duct 3 is connected to the outlet of the air supply device 2 to deliver fresh air supplied by the air supply device 2, and the other end corresponds to the nutrient solution tank 1. The spraying device 4 is installed in the air duct 3 and is connected to the nutrient solution tank 1 through a pumping pipeline. It is used to deliver the nutrient solution in the nutrient solution tank 1 into the air duct 3 for spraying, so that the nutrient solution can fully contact the fresh air inside the air duct 3 before falling back into the nutrient solution tank 1.
[0024] As can be seen from the above scheme, this utility model provides fresh air to the greenhouse through the air supply device 2 and forms a directional airflow channel through the air duct 3, preventing air from diffusing and escaping within the greenhouse, thereby achieving directional airflow delivery to the nutrient solution tank 1. By embedding the spray device 4 inside the air duct 3, it can prevent contact with dust and other impurities in the greenhouse, thus preventing contamination of the nutrient solution. The nutrient solution sprayed by the spray device 4 is distributed in the form of mist or small droplets in the air duct 3, forming counter- or forward convection contact with the directional airflow, fully absorbing oxygen from the air, significantly increasing the dissolved oxygen content of the nutrient solution when it falls into the nutrient solution tank 1, effectively alleviating the root hypoxia problem caused by high summer temperatures. Furthermore, after the nutrient solution sprayed by the spray device 4 undergoes gas-liquid contact within the air duct 3, it can fall directly to the corresponding nutrient solution tank 1 below, and can be pumped back into the air duct 3 for gas-liquid contact again, forming a closed-loop cycle of spraying-contact-recovery, with no nutrient solution leakage or loss.
[0025] In addition, when the greenhouse is hot, the fresh air delivered by the air supply device 2 comes into direct contact with the sprayed nutrient solution inside the air duct 3. The airflow can also reduce the temperature of the nutrient solution through heat exchange, which helps to control the temperature of the nutrient solution within a suitable range and solve the problem of reduced dissolved oxygen in saturated water caused by high temperature.
[0026] In this embodiment, a support 5 is also included. The support 5 is disposed between the spray device 4 and the nutrient solution tank 1. The top of the support 5 is connected to the spray device 4, and the bottom of the support 5 is connected to the tank wall or bottom of the nutrient solution tank 1.
[0027] This setup, with the support bracket 5 providing stable support, ensures that the spray device 4 is stably placed at a preset height inside the air duct 3, preventing shaking caused by airflow impact or liquid flow. This ensures that the nutrient solution droplets sprayed by the spray device 4 are accurately distributed in the airflow field of the air duct 3, further guaranteeing stable dissolved oxygen efficiency. The height of the support bracket 5 can be flexibly designed according to the size of the spray device 4 and the length of the air duct 3, ensuring that the relative positions of the spray device 4 and the air duct 3 are adapted to maximize the gas-liquid contact area.
[0028] Optionally, the support frame 5 is made of metal profiles or rigid PVC splicing. Its bottom can be fastened to the concrete pool wall or bottom embedded parts of the nutrient solution pool 1 by expansion bolts, or it can be detachably fixed to the pool wall by clamps. The top of the support frame 5 can be fixed to the shell or pipe of the spray device 4 by a snap-fit structure, so that the spray device 4 is stably suspended at a preset height inside the air duct 3. The height of the support frame 5 can be adjusted according to actual needs to flexibly adapt to different sizes of air duct 3 and nutrient solution pool 1 depth, thereby enhancing the overall structural stability and installation adaptability of the device.
[0029] Reference Figure 2 In some embodiments, the spray device 4 includes a rotary joint 41, a riser 42, and a multi-port connector. The riser 42 is vertically arranged on the top of the support 5. One end (bottom end) of the riser 42 is connected to the pumping pipeline, and the other end (top end) is sealed to the fixed end of the rotary joint 41. The multi-port connector includes a main interface and multiple branch interfaces. The main interface is fastened to the movable end of the rotary joint 41 by a snap or thread, forming a passage for water to flow from the riser 42 through the rotary joint 41 to the multi-port connector. The movable end of the rotary joint 41 can rotate 360° around its own axis. Multiple branch interfaces are distributed circumferentially along the main interface, and each branch interface is connected to a spray pipe 43 by a hose connector or welding. Multiple spray holes 44 are provided on the side wall of the spray pipe 43.
[0030] It should be noted that the rotary joint 41 is a product of existing technology, and its structure and principle are not the focus of this article, so they will not be discussed further here.
[0031] In this configuration, the riser 42 is only used for nutrient solution delivery and does not participate in rotational movement. The riser 42 is connected to the multi-way connector via a rotary joint 41, enabling the nutrient solution to be supplied to the multi-way connector. The multiple branch interfaces of the multi-way connector are evenly distributed circumferentially, such as 3-6 branch interfaces spaced at 120° or 60° angles, which can equally distribute the nutrient solution delivered by the riser 42 to each spray pipe 43, ensuring that the flow rate and pressure of each spray pipe 43 are consistent, and keeping the size and density of the droplets sprayed from the spray holes 44 uniform. The movable end of the rotary joint 41 is connected to the multi-way connector, causing the multi-way connector to drive each spray pipe 43 to rotate around the axis of the riser 42, combined with the side of the spray pipe 43. Multiple spray holes 44 on the wall form a dynamic rotating spray pattern. Compared with fixed spraying, this can significantly increase the coverage of nutrient solution in the air duct 3, avoid dead corners in gas-liquid contact, and ensure that each part of the nutrient solution can fully exchange with fresh air, thus improving dissolved oxygen efficiency. Moreover, the rotation of the spray pipe 43 does not require an additional power source. It can utilize the reaction force when the nutrient solution is sprayed out by the spray holes 44. For example, if the spray holes 44 on multiple spray pipes 43 are all set on the same side, or if the opening direction of the spray holes 44 is deviated from the radial direction of the spray pipe 43, a tangential thrust is formed to drive the rotation. With the low-friction bearing structure of the rotary joint 41, stable rotation can be achieved with only a small water supply pressure.
[0032] In this embodiment, the end of the spray pipe 43 away from the branch interface is closed, and the spray pipe 43 is set perpendicular to the riser 42, or the spray pipe 43 and the riser 42 have an inclined angle.
[0033] With this configuration, after the end of the spray pipe 43 away from the branch interface is closed, the nutrient solution can only be sprayed out through the side wall spray hole 44 in the pipe cavity. The closed end can prevent external impurities from entering the spray pipe 43. The closed end can be sealed by welding or threaded sealing parts depending on the material of the spray pipe 43. The vertical angle makes the spray pipe 43 extend horizontally along the radial direction of the air duct 3. With the rotational movement, the spray area with the largest diameter can be formed in the cross section of the air duct 3. It is especially suitable for large-diameter air duct 3 scenarios, ensuring that the nutrient solution can cover the entire cross section of the air duct 3 and form all-round contact with the airflow field in the air duct 3.
[0034] The angle at which the spray pipe 43 is tilted upward or downward relative to the riser pipe 42 allows the droplets to gain an initial axial velocity, forming a superimposed motion with the airflow inside the duct 3 in the forward or reverse direction. For example, when tilted downward at 30°, the droplets fall faster, which is suitable for scenarios where the duct 3 is relatively short. When tilted upward at 45°, the droplets rise first and then fall, extending their movement path inside the duct 3 and increasing their contact time with the air, making them particularly suitable for high-demand scenarios that require enhanced cooling or oxygenation effects.
[0035] Optionally, multiple sets of spray holes 44 are provided, with multiple spray holes 44 in each set spaced apart along the axial direction of the spray pipe 43. For example, each set of spray holes 44 is evenly distributed along the axial direction of the spray pipe 43, so that the nutrient solution is evenly sprayed out along the entire length of the spray pipe 43, covering different radial positions of the air duct 3. In conjunction with the rotation of the spray pipe 43, the distribution density of the nutrient solution in the air duct 3 is increased.
[0036] Multiple sets of spray holes 44 are arranged around the axis of the spray pipe 43, that is, multiple sets of spray holes 44 are arranged around the circumference of the spray pipe 43, which allows the nutrient solution to be sprayed out from the circumference of the spray pipe 43 in all directions, rather than the planar range of traditional single-sided spraying. This design improves gas-liquid contact and significantly enhances dissolved oxygen and heat exchange effects.
[0037] In some embodiments, the diameter of the spray hole 44 is 2-5 mm, and the center distance between two adjacent spray holes 44 in each group is 8-15 mm.
[0038] In this embodiment, the pumping pipeline includes a liquid supply pipeline and a water pump 6. One end of the liquid supply pipeline is connected to the nutrient solution tank 1, and the other end is connected to the port of the riser 42. The water pump 6 is installed in the liquid supply pipeline and is used to pump the nutrient solution from the nutrient solution tank 1 to the spray pipe 43.
[0039] Preferably, the inlet of the water pump 6 is covered with a filter screen, which can prevent impurities in the nutrient solution from affecting the water pump 6, causing the water pump 6 to malfunction and affecting its working efficiency; it can also prevent the spray holes 44 of the spray pipe 43 from being blocked, resulting in uneven spraying and reduced gas-liquid contact efficiency.
[0040] Optionally, the air supply device 2 is a circulating fan, with its air inlet located outside the greenhouse and its air outlet sealed to the end of the air duct 3. For example, a flange is provided at the air outlet of the circulating fan, which is integrally formed with the fan housing. The end of the air duct 3 near the circulating fan has an annular flange that matches the flange. The flange and the annular flange are fitted together by a sealing gasket and fastened together by bolts evenly distributed around the circumference.
[0041] Preferably, the air duct 3 is vertically arranged, with its first end connected to the air outlet of the air supply device 2. For example, one end of the air duct 3 is fitted against the air outlet face of the circulating fan and fixedly connected by a ring-shaped buckle, clamp, or evenly distributed bolts. The second end of the air duct 3 faces the nutrient solution tank 1, enabling airflow to be transported axially along the air duct 3. The air duct 3 can be a rigid tubular structure made of PVC material or a cylindrical structure formed by rolling up plastic cloth. This design facilitates the sealing connection of the air duct 3's port to other components and also facilitates observation of the internal conditions.
[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A nutrient solution oxygenation device, characterized by, Set up in a greenhouse, including: Nutrient solution tank (1); An air supply device (2) is installed on the top of the greenhouse, with the air outlet of the air supply device (2) facing the inside of the greenhouse; The air duct (3) is connected at one end to the air outlet of the air supply device (2) for supplying fresh air supplied by the air supply device (2); the other end corresponds to the nutrient solution pool (1). A spraying device (4) is installed in the air duct (3). The spraying device (4) is connected to the nutrient solution tank (1) through a pumping pipeline. It is used to send the nutrient solution in the nutrient solution tank (1) to the air duct (3) for spraying, so that the nutrient solution can fully contact the fresh air in the air duct (3) before falling into the nutrient solution tank (1).
2. The nutrient solution oxygenation device of claim 1, wherein, Also includes: A support (5) is provided between the spray device (4) and the nutrient solution tank (1). The top of the support (5) is connected to the spray device (4), and the bottom of the support (5) is connected to the wall or bottom of the nutrient solution tank (1).
3. The nutrient solution oxygenation device of claim 2, wherein, The spraying device (4) includes: Rotary joint (41); A riser (42) is vertically installed on the top of the support (5). One end of the riser (42) is connected to the pumping pipeline, and the other end is connected to the fixed end of the rotary joint (41). The multi-port connector includes a main interface and multiple branch interfaces. The main interface is connected to the movable end of the rotary joint (41). The multiple branch interfaces are distributed circumferentially along the main interface, and each branch interface is connected to a spray pipe (43). The side wall of the spray pipe (43) is provided with multiple spray holes (44).
4. The nutrient solution oxygenation device of claim 3, wherein, The end of the spray pipe (43) away from the branch interface is closed, and the spray pipe (43) is set perpendicular to the riser (42), or the spray pipe (43) and the riser (42) have an inclined angle.
5. The nutrient solution oxygenation device of claim 3, wherein The spray holes (44) are provided in multiple sets, and the multiple spray holes (44) in each set are spaced apart along the axial direction of the spray pipe (43), and the multiple sets of spray holes (44) are arranged around the axis of the spray pipe (43).
6. The nutrient solution oxygenation device of claim 3, wherein, The pumping pipeline includes: The liquid supply pipeline has one end connected to the nutrient solution tank (1) and the other end connected to the port of the riser (42); A water pump (6) is installed in the liquid supply pipeline to pump the nutrient solution from the nutrient solution tank (1) to the spray pipe (43).
7. The nutrient solution oxygenation apparatus of claim 1, wherein The air supply device (2) is a circulating fan. The air inlet of the circulating fan is located outside the greenhouse, and the air outlet of the circulating fan is sealed to the end of the air duct (3).
8. The nutrient solution oxygenation apparatus of claim 1, wherein, The air duct (3) is set vertically, with the first end of the air duct (3) connected to the air outlet of the air supply device (2) and the second end of the air duct (3) facing the nutrient solution pool (1).
9. The nutrient solution oxygenation apparatus of claim 6, wherein, The inlet of the water pump (6) is covered with a filter screen.
10. The nutrient solution oxygenation apparatus of claim 3, wherein, The diameter of the spray hole (44) is 2-5mm, and the center distance between two adjacent spray holes (44) in each group is 8-15mm.