Greenhouse water and fertilizer integrated equipment

The dual liquid flow stirring of the L-shaped hollow stirring rod and spiral blades and the centrifugal separation of the conical disk solve the problem of suspended and precipitated impurities in powdered fertilizers, achieve efficient mixing of water and fertilizer and uniform fertilization, and improve the service life of the equipment and irrigation efficiency.

CN120754732AInactive Publication Date: 2025-10-10HEFEI JIANYE GREENHOUSE ENG CO LTD
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Patent Information

Application Number
CN202511019589.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-23
Publication Date
2025-10-10
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Traditional integrated water and fertilizer equipment easily generates dust when mixing powdered fertilizers, causing the fertilizer to float on top of the equipment, making it difficult to fully mix with water, and precipitated impurities difficult to separate, affecting irrigation efficiency and equipment life.

Method used

The L-shaped hollow stirring rod and spiral blades work together to form double liquid flow stirring, combined with the conical disk to centrifugally separate the sediment, and the gas supply mechanism promotes mixing to avoid powder suspension and impurity deposition.

Benefits of technology

It achieves full mixing of powder fertilizer and water, reduces waste, improves fertilization uniformity and irrigation efficiency, extends equipment life, and avoids clogging by impurities.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses greenhouse water and fertilizer integrated equipment which comprises a shell, and supporting legs are mounted at the lower end of the shell; the mixing mechanism comprises a mounting frame mounted at the upper end of the shell, a driving motor is mounted on the mounting frame, an output shaft of the driving motor extends into the shell and is fixedly connected with a rotating pipe, and L-shaped hollow stirring rods are fixedly connected to the two sides of the lower end of the rotating pipe; the horizontal part and the vertical part of each L-shaped hollow stirring rod are fixedly connected through a reinforcing rod; and the liquid flowing mechanism comprises a vertical cylinder which is vertically arranged in the shell. When the equipment is used and used for mixing a powdery fertilizer with a water body, the situation that some powder suspends at the top of the equipment in a dust shape due to impact of the water body, and consequently part of the fertilizer is not used can be effectively avoided, and in addition, sediment impurities in mixed liquid can be separated and collected in a centralized mode.
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Description

Technical Field

[0001] The present invention relates to the field of water and fertilizer irrigation, and in particular to a greenhouse water and fertilizer integrated equipment. Background Art

[0002] In the field of agricultural planting, greenhouse planting technology has been widely used because it can provide a relatively stable growth environment for crops, effectively resist the influence of adverse external climatic conditions, and thus ensure crop yield and quality. In the greenhouse planting process, water and fertilizer management is a key link affecting crop growth. As an efficient and precise fertilization method, integrated water and fertilizer technology has gradually become a trend in the development of modern agriculture. Traditional integrated water and fertilizer equipment has significant drawbacks when mixing powdered fertilizer with water. Because powdered fertilizer particles are small, they easily form dust when in direct contact with and impacted by water. This dust becomes suspended in the equipment's overhead space, making it difficult to fully mix with the water. This prevents some fertilizer from effectively dissolving and being transported to the crop roots with the irrigation water, resulting in fertilizer waste and increased planting costs. Furthermore, during the mixing of fertilizer and water, some precipitated impurities are inevitably generated. If these impurities are not separated and processed, they will enter the fields through the irrigation system, potentially clogging irrigation equipment such as drip irrigation tapes and sprinklers, affecting the normal operation of the irrigation system, reducing irrigation efficiency, and increasing equipment maintenance costs. Existing equipment only uses a filter box to filter these impurities, but the filter box still needs to be manually cleaned after a period of use. Summary of the Invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and propose a greenhouse water-fertilizer integrated equipment. When the equipment is in use, when mixing powdered fertilizer with water, it can effectively avoid some powder from becoming dust-like and suspended at the top of the equipment due to the impact of water, resulting in part of the fertilizer not being used. In addition, the precipitated impurities in the mixed liquid can be separated and collected centrally.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A greenhouse water and fertilizer integrated equipment includes a shell, the lower end of which is equipped with a supporting foot; a mixing mechanism, the mixing mechanism includes a mounting frame installed on the upper end of the shell, a driving motor is installed on the mounting frame, the output shaft of the driving motor extends to the interior of the shell and is fixedly connected to a rotating tube, both sides of the lower end of the rotating tube are fixedly connected to L-shaped hollow stirring rods, and the horizontal part and the vertical part of each L-shaped hollow stirring rod are fixedly connected by a reinforcement rod; a liquid flow mechanism, the liquid flow mechanism includes a vertical cylinder vertically arranged in the shell, the two sides of the vertical cylinder are fixedly connected to the inner wall of the shell by two fixing rods respectively, the rotating tube passes through the vertical cylinder, and the rotating tube passing through the vertical cylinder part is equipped with spiral blades; a separation mechanism, the separation mechanism is used to separate and collect sediments; a gas supply mechanism, the gas supply mechanism is used to improve the mixing effect of the mixing mechanism and facilitate subsequent discharging operations.

[0005] Preferably, the inner bottom of the shell is connected to a drain pipe, and a solenoid valve is installed on the drain pipe.

[0006] Preferably, the separation mechanism includes a conical disk arranged in the shell, a plurality of separation holes are opened on the conical disk, the vertical cylinder passes through the conical disk and is slidably connected to the conical disk, and L-shaped connecting rods are fixedly connected to both sides of the rotating tube, and the other ends of the two L-shaped connecting rods are fixedly connected to the conical disk.

[0007] Preferably, a delivery port is provided at the upper end of the shell, the lower end of the delivery port extends to the interior of the shell and is located below the conical disk, and a second sealing cover is installed at the upper end of the delivery port.

[0008] Preferably, a discharge port is provided through the left side wall of the shell, the inner bottom surface of the discharge port is a slope inclined to the left, and a first sealing cover is provided on the left side of the shell, and the first sealing cover is fixedly connected to the side wall of the shell by a limit screw.

[0009] Preferably, the gas supply mechanism includes a rotating rod rotatably connected to the upper end of the shell, and the rotating rod and the output shaft of the driving motor are both equipped with pulleys, and the two pulleys are connected by a transmission belt.

[0010] Preferably, the upper end of the shell is fixedly connected to a piston cylinder, a piston plate that can slide back and forth is provided in the piston cylinder, the upper end of the rotating rod is fixedly connected to a rotating disk, the upper end of the rotating disk is eccentrically connected to a connecting rod, and the other end of the connecting rod is rotatably connected to the front side of the piston plate.

[0011] Preferably, the rear side of the piston cylinder is provided with a one-way port, and the rear side of the piston cylinder is in space communication with a one-way pipe, and the lower end of the rotating pipe extends to the outside and is in communication with the other end of the one-way pipe through a rotary joint.

[0012] Preferably, a first one-way valve is installed inside the one-way port, and a second one-way valve is installed inside the one-way pipe, and the one-way flow direction of the first one-way valve is that the outside unidirectionally enters the rear side space of the piston cylinder, and the one-way flow direction of the second one-way valve is that the piston cylinder unidirectionally enters the rotating pipe.

[0013] Preferably, the two L-shaped hollow stirring rods are in communication with the rotating pipe, and a plurality of air injection holes in communication with the inside of the L-shaped hollow stirring rod are formed in the upper end of the horizontal part of the two L-shaped hollow stirring rods.

[0014] Compared with the prior art, the present application has the following beneficial effects: 1. The L-shaped hollow stirring rod cooperates with the spiral blade to form horizontal stirring and vertical circulation double liquid flow, accelerate the fusion of powder fertilizer and water body, avoid local concentration unevenness, shorten the mixing time, and improve the water and fertilizer preparation efficiency.

[0015] 2. The raised powder is flushed to the mixing liquid surface through the conical disc, the separation hole and the liquid dispersion falling path, the powder is prevented from being suspended on the top of the equipment, the fertilizer is fully dissolved and utilized, the waste is reduced, and the fertilization uniformity and crop absorption efficiency are improved.

[0016] 3. The conical disc realizes liquid-solid separation by centrifugal force, the sediment is automatically discharged along the inclined discharge port, the manual cleaning frequency is reduced, impurities are prevented from entering the irrigation system, the service life of the equipment is prolonged, and the health of crop roots is ensured.

[0017] 4. The gas supply mechanism disturbs the liquid flow by bubble floating, further breaks the mixing dead angle, and improves the mixing uniformity.

[0018] 5. After mixing is completed, the gas supply mechanism pressurizes and pushes the mixed liquid to be quickly discharged, and the irrigation of water and fertilizer can be completed without using a pump body. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structure diagram of a greenhouse water and fertilizer integrated equipment is provided for the present application; Figure 2 A cross-sectional view of Figure 1 ; Figure 3 A rear side view of Figure 1 ; Figure 4 An enlarged view of A of Figure 3 ; Figure 5This is a structural diagram of the coordination of the liquid flow mechanism and the stirring mechanism.

[0020] In the figure: 1 shell, 2 supporting foot, 3 first sealing cover, 4 limit screw, 5 feeding port, 6 second sealing cover, 7 mounting frame, 8 driving motor, 9 pulley, 10 transmission belt, 11 piston cylinder, 12 piston plate, 13 connecting rod, 14 rotating disk, 15 one-way pipe, 16 discharge pipe, 17 discharge port, 18 fixed rod, 19 vertical cylinder, 20 rotary joint, 21 solenoid valve, 22 one-way port, 23 first one-way valve, 24 second one-way valve, 25 rotating tube, 26 L-shaped connecting rod, 27 conical disk, 28 separation hole, 29 spiral blade, 30 L-shaped hollow stirring rod, 31 reinforcement rod, 32 air injection hole. DETAILED DESCRIPTION

[0021] In the description of this application, it should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0022] It should be noted that the terms "first," "second," etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and that the objects distinguished by "first," "second," etc. are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0023] It should be noted that, in the description of this application, the directions or positional relationships indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional terms do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional terms "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0024] Reference Figure 1-Figure 5 , a greenhouse water and fertilizer integrated equipment, including a shell 1, a supporting foot 2 is installed at the lower end of the shell 1, the inner bottom of the shell 1 is connected with a drain pipe 16, the drain pipe 16 is installed with a solenoid valve 21, the other end of the drain pipe 16 is connected with the irrigation system of the greenhouse, the upper end of the shell 1 is provided with a feeding port 5, the lower end of the feeding port 5 extends to the interior of the shell 1 and is located below the conical disk 27, the upper end of the feeding port 5 is installed with a second sealing cover 6, the second sealing cover 6 here is connected to the feeding port 5 by a threaded connection. When in use, powder fertilizer is first put through the feeding port 5, and then an appropriate amount of water is put in. The final liquid level height is not higher than the connection point between the feeding port 5 and the shell 1. It should be noted that due to the small aperture of the separation hole 28, the powder will not pass through the separation hole 28 and move upward; As an embodiment of the present invention, a mixing mechanism is further included. The mixing mechanism includes a mounting frame 7 mounted on the upper end of the housing 1. A drive motor 8 is mounted on the mounting frame 7. The output shaft of the drive motor 8 extends into the interior of the housing 1 and is fixedly connected to a rotating tube 25. L-shaped hollow stirring rods 30 are fixedly connected to both sides of the lower end of the rotating tube 25. The horizontal portion and the vertical portion of each L-shaped hollow stirring rod 30 are fixedly connected by a reinforcement rod 31. As an embodiment of the present invention, a liquid flow mechanism is further included. The liquid flow mechanism includes a vertical cylinder 19 vertically arranged in the housing 1. The two sides of the vertical cylinder 19 are fixedly connected to the inner wall of the housing 1 by two fixing rods 18. A rotating tube 25 passes through the vertical cylinder 19. The portion of the rotating tube 25 passing through the vertical cylinder 19 is equipped with a spiral blade 29. When the spiral blade 29 rotates, liquid flow from bottom to top is generated. As an embodiment of the present invention, it also includes a separation mechanism, which is used to separate and collect the sediment. The separation mechanism includes a conical disk 27 arranged in the shell 1, and a plurality of separation holes 28 are opened on the conical disk 27. The vertical cylinder 19 passes through the conical disk 27 and is slidably connected to the conical disk 27. Both sides of the rotating tube 25 are fixedly connected with L-shaped connecting rods 26, and the other ends of the two L-shaped connecting rods 26 are fixedly connected to the conical disk 27. A discharge port 17 is provided on the left side wall of the shell 1, and the inner bottom surface of the discharge port 17 is an inclined surface inclined to the left. A first sealing cover 3 is provided on the left side of the shell 1, and the first sealing cover 3 is fixedly connected to the side wall of the shell 1 by a limit screw 4. When the spiral blades 29 rotate, the conical disk 27 will also rotate. When it rotates, it can first quickly separate the liquid and the sediment through centrifugal force, leaving the sediment above the conical disk 27, and then under the action of centrifugal force, it will eventually be thrown to the discharge port 17 along the conical disk 27. In addition, the rotation is combined with multiple separation holes 28 to disperse the water falling from the upper end of the vertical cylinder 19. These water bodies will eventually fall to the liquid surface of the mixed liquid in the shell 1 under the action of gravity. During the falling process, the raised fertilizer powder can be washed into the mixed water body, effectively avoiding the situation where some powder is suspended in the form of dust at the top of the equipment due to the impact of the water body, resulting in some fertilizer not being used. As an embodiment of the present invention, it also includes a gas supply mechanism, which is used to improve the mixing effect of the mixing mechanism and facilitate the subsequent discharging operation. The gas supply mechanism includes a rotating rod rotatably connected to the upper end of the shell 1, and the rotating rod and the output shaft of the drive motor 8 are both equipped with pulleys 9. The two pulleys 9 are connected by a transmission belt 10. The upper end of the shell 1 is fixedly connected to a piston cylinder 11, and a piston plate 12 that can slide back and forth is provided in the piston cylinder 11. The upper end of the rotating rod is fixedly connected to a rotating disk 14, and the upper end of the rotating disk 14 is rotatably connected to a connecting rod 13 at the eccentric position. The other end of the connecting rod 13 is rotatably connected to the front side of the piston plate 12. A one-way port 22 is provided on the rear side of the piston cylinder 11, and the rear space of the piston cylinder 11 is connected to a one-way tube 15. The lower end of the rotating tube 25 extends to the outside world and is connected to the other end of the one-way tube 15 through a rotary joint. 20 is connected, a first one-way valve 23 is installed inside the one-way port 22, and a second one-way valve 24 is installed inside the one-way tube 15. The one-way flow direction of the first one-way valve 23 is that the outside world unidirectionally enters the rear space of the piston cylinder 11, and the one-way valve flow direction inside the second one-way valve 24 is that the piston cylinder 11 unidirectionally enters the rotating tube 25. The two L-shaped hollow stirring rods 30 are both connected to the rotating tube 25, and the upper ends of the horizontal parts of the two L-shaped hollow stirring rods 30 are provided with a plurality of air injection holes 32 connected to the interior of the L-shaped hollow stirring rods 30. When the second sealing cover 6 is opened, the gas is supplied to the mechanism, and after the gas floats up in the form of bubbles, it can further promote the flow of internal liquid, thereby achieving the effect of improving mixing. When the second sealing cover 6 is closed and the solenoid valve 21 is opened, the gas supply mechanism can increase the air pressure in the top space of the shell 1 after use, and press the mixed water and fertilizer in the shell 1 into the subsequent irrigation system for irrigation.

[0025] In the present invention, the second sealing cover 6 is opened, and powdered fertilizer is added into the housing 1 through the introduction port 5. Then, an appropriate amount of water is injected, and the liquid level does not exceed the connection point between the introduction port 5 and the housing 1. At this time, the powdered fertilizer is located below the conical disk 27. Due to the small diameter of the separation hole 28, the powder will not pass through the separation hole 28 and move upward. The drive motor 8 is started, and its output shaft rotates the rotating tube 25, which in turn rotates the L-shaped hollow stirring rods 30 on both sides. During rotation, the L-shaped hollow stirring rods 30 stir the liquid in the housing 1, initially mixing the powdered fertilizer with the water. The reinforcement rods 31 enhance the structural strength of the L-shaped hollow stirring rods 30, ensuring stability during the stirring process. When the rotating tube 25 rotates within the vertical cylinder 19, the spiral blades 29 thereon rotate accordingly, generating a bottom-up flow of liquid. This flow circulates the liquid within the housing 1, further promoting the mixing of the powdered fertilizer and the water, and avoiding localized uneven concentrations. The rotating tube 25 drives the conical disc 27 to rotate via the L-shaped connecting rod 26. The rotation of the conical disc 27 generates centrifugal force, which quickly separates the liquid and sediment, leaving the sediment above the conical disc 27. As the conical disc 27 continues to rotate, the sediment is thrown along the conical disc 27 to the discharge port 17 under the action of centrifugal force. The bottom of the discharge port 17 is inclined to the left to facilitate the discharge of the sediment. At the same time, the water falling from the upper end of the vertical cylinder 19 is dispersed by the conical disc 27, and the fertilizer powder raised during the falling process is washed down to the surface of the mixed liquid, preventing the powder from floating at the top of the equipment. When the output shaft of the driving motor 8 rotates, the rotating rod is driven to rotate through the pulley 9 and the transmission belt 10. The rotating rod drives the rotating disk 14 to rotate, and the rotating disk 14 drives the piston plate 12 to slide back and forth in the piston cylinder 11 through the connecting rod 13. When the piston plate 12 slides forward, the external gas enters the space on the rear side of the piston cylinder 11 through the one-way port 22; when the piston plate 12 slides backward, the gas in the space on the rear side of the piston cylinder 11 enters the rotating tube 25 through the one-way tube 15 and the rotary joint 20, and then flows into the L-shaped hollow stirring rod 30, and finally ejected from the air jet hole 32. When the second sealing cover 6 is open, the ejected gas floats up in the form of bubbles, further promoting the flow of liquid and improving the mixing effect; When mixing is complete, close the second sealing cover 6 and open the solenoid valve 21. The gas supply mechanism continues to operate, increasing the air pressure in the headspace of the housing 1. This forces the mixed water and fertilizer in the housing 1 through the drainage pipe 16 to the greenhouse's irrigation system, completing the irrigation operation. To remove sediment, remove the stop screw 4, open the first sealing cover 3, and clean the sediment above the conical disk 27 through the discharge port 17.

[0026] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A greenhouse water and fertilizer integrated equipment, characterized in that: include: A housing (1), wherein a support foot (2) is mounted on the lower end of the housing (1); A mixing mechanism, the mixing mechanism comprising a mounting frame (7) mounted on the upper end of a housing (1), a driving motor (8) mounted on the mounting frame (7), an output shaft of the driving motor (8) extending into the interior of the housing (1) and fixedly connected to a rotating tube (25), L-shaped hollow stirring rods (30) fixedly connected to both sides of the lower end of the rotating tube (25), and a horizontal portion and a vertical portion of each L-shaped hollow stirring rod (30) fixedly connected via a reinforcing rod (31); A liquid flow mechanism, the liquid flow mechanism comprising a vertical cylinder (19) vertically arranged in the housing (1), two sides of the vertical cylinder (19) being fixedly connected to the inner wall of the housing (1) via two fixing rods (18), the rotating tube (25) passing through the vertical cylinder (19), and a spiral blade (29) being installed on the portion of the rotating tube (25) passing through the vertical cylinder (19); A separation mechanism, wherein the separation mechanism is used to separate and centrally collect the sediment; The gas supply mechanism is used to improve the mixing effect of the mixing mechanism and facilitate subsequent discharge operations.

2. A greenhouse water and fertilizer integrated equipment according to claim 1, characterized in that: The inner bottom of the housing (1) is connected to a drain pipe (16), and a solenoid valve (21) is installed on the drain pipe (16).

3. A greenhouse water and fertilizer integrated equipment according to claim 1, characterized in that: The separation mechanism comprises a conical disk (27) arranged in the housing (1), a plurality of separation holes (28) are formed on the conical disk (27), the vertical cylinder (19) passes through the conical disk (27) and is slidably connected to the conical disk (27), and both sides of the rotating tube (25) are fixedly connected to L-shaped connecting rods (26), and the other ends of the two L-shaped connecting rods (26) are fixedly connected to the conical disk (27).

4. A greenhouse water and fertilizer integrated equipment according to claim 3, characterized in that: The upper end of the housing (1) is provided with a delivery port (5), the lower end of the delivery port (5) extends into the interior of the housing (1) and is located below the conical disk (27), and the upper end of the delivery port (5) is installed with a second sealing cover (6).

5. The greenhouse water and fertilizer integrated equipment according to claim 3, characterized in that: A discharge port (17) is provided through the left side wall of the shell (1), and the inner bottom surface of the discharge port (17) is a slope inclined to the left. A first sealing cover (3) is provided on the left side of the shell (1), and the first sealing cover (3) is fixedly connected to the side wall of the shell (1) via a limit screw (4).

6. The greenhouse water and fertilizer integrated equipment according to claim 1, characterized in that: The gas supply mechanism includes a rotating rod rotatably connected to the upper end of the housing (1), and the rotating rod and the output shaft of the driving motor (8) are both equipped with pulleys (9), and the two pulleys (9) are connected by a transmission belt (10).

7. A greenhouse water and fertilizer integrated equipment according to claim 6, characterized in that: The upper end of the housing (1) is fixedly connected to a piston cylinder (11), a piston plate (12) that can slide back and forth is provided in the piston cylinder (11), the upper end of the rotating rod is fixedly connected to a rotating disk (14), the upper end of the rotating disk (14) is rotatably connected to a connecting rod (13) at an eccentric position, and the other end of the connecting rod (13) is rotatably connected to the front side of the piston plate (12).

8. The greenhouse water and fertilizer integrated equipment according to claim 7, characterized in that: A one-way port (22) is provided on the rear side of the piston cylinder (11), and the rear space of the piston cylinder (11) is connected to a one-way tube (15). The lower end of the rotating tube (25) extends to the outside and is connected to the other end of the one-way tube (15) via a rotary joint (20).

9. The greenhouse water and fertilizer integrated equipment according to claim 8, characterized in that: A first one-way valve (23) is installed inside the one-way port (22), and a second one-way valve (24) is installed inside the one-way tube (15). The one-way flow direction of the first one-way valve (23) is one-way flow from the outside into the rear space of the piston cylinder (11), and the one-way flow direction inside the second one-way valve (24) is one-way flow from the piston cylinder (11) into the rotating tube (25).

10. The greenhouse water and fertilizer integrated equipment according to claim 9, characterized in that: The two L-shaped hollow stirring rods (30) are both connected to the rotating tube (25), and the upper ends of the horizontal portions of the two L-shaped hollow stirring rods (30) are each provided with a plurality of air injection holes (32) connected to the interior of the L-shaped hollow stirring rods (30).