Liquid fertilizer proportioning combination valve and operation process thereof

Abstract

The application discloses a liquid fertilizer proportioning combination valve and an operation process thereof, and relates to the field of agricultural machinery, which can meet the nutrient demand of different types of crops.The liquid fertilizer proportioning combination valve comprises a variable-diameter Venturi tube, a liquid fertilizer proportioning valve and a guide vane; the main pipeline of the variable-diameter Venturi tube is installed on the valve shell of the liquid fertilizer proportioning valve, and the guide vane is installed at the connection between the main pipeline and the valve shell.The liquid fertilizer proportioning combination valve can meet the proportioning demand of different types and different proportions of liquid fertilizer under the water and fertilizer integration in modern agricultural production, and can realize the mixing of liquid fertilizer of different types and proportions through the liquid fertilizer proportioning valve, and can realize the addition of liquid fertilizer of different proportions through the variable-diameter Venturi tube, so that the types and proportions of liquid fertilizer can be adjusted at any time, and the nutrient demand of different types of crops can be met.The liquid fertilizer proportioning combination valve adopts a full mechanical structure design, is suitable for various field operation environments, and has the advantages of simple operation, stable structure and convenient maintenance.

Description

Technical Field

[0001] This invention belongs to the field of agricultural water conservancy equipment design, specifically relating to a liquid fertilizer ratio combination valve and its operating process. Background Technology

[0002] In agricultural production, with the development of modern agriculture, integrated water and fertilizer management has become an important trend. To meet the needs of crop growth, different types and proportions of liquid fertilizer are required for different crops at different growth stages. Traditional liquid fertilizer preparation methods often require manual measurement and mixing, which is cumbersome and lacks precision, failing to meet the requirements of modern agriculture for precision and efficiency. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a liquid fertilizer ratio combination valve and its operating process. By changing the combination of liquid fertilizer water passages and the water passage area of ​​the variable diameter Venturi channel, the type and ratio of liquid fertilizer can be adjusted at any time to meet the nutritional needs of different types of crops.

[0004] This invention is achieved through the following technical solution:

[0005] A liquid fertilizer proportioning combination valve includes a variable diameter venturi tube, a liquid fertilizer proportioning valve, and a flow guide plate; wherein the main pipe of the variable diameter venturi tube is installed on the valve body of the liquid fertilizer proportioning valve, and the flow guide plate is installed at the connection between the main pipe and the valve body.

[0006] The variable-diameter Venturi tube includes a main pipe, a first water-stop plate, a second water-stop plate, a first water-baffle plate, a second water-baffle plate, a Venturi reducer, a reducer gear, and an adjusting gear; the main pipe is a T-shaped tee pipe composed of a main pipe and branch pipes; the main pipe contains, axially, a first water-stop plate, a first water-baffle plate, a Venturi reducer, a second water-baffle plate, and a second water-stop plate; the branch pipe is located below the main pipe and is connected to the top of the valve body of the liquid fertilizer proportioning valve; the Venturi reducer is... The Venturi reducer features a circular tube structure. A reducer gear is circumferentially mounted on the rear section of the tube wall, engaging and matching an adjusting gear. An opening is located on the corresponding position of the main tube wall, through which the adjusting gear protrudes to adjust the circumferential rotation of the Venturi reducer. The reducer contains three Venturi tubes, evenly distributed at 120° intervals along the axial direction of the reducer. The ends of the contraction and diffusion sections of the three Venturi tubes are... The diameters are the same; all three Venturi tubes have holes on the outward-facing pipe walls at their throats, and the Venturi reducer has a hole on its bottom pipe wall. When one of the three Venturi tubes rotates circumferentially along the Venturi reducer to the bottom of the main pipe, the holes at the throats of the Venturi tubes, the holes on the bottom pipe walls of the Venturi reducer, and the end openings of the branch pipes correspond one-to-one; the first and second water-stop plates are both circular plates with holes, the diameter of which matches the diameter of the main pipe, and each hole has a frustum-shaped flared opening. The flared openings of the first and second water-stop plates respectively fit into the contraction and diffusion sections of the Venturi tube located at the bottom of the main pipe to form an extension structure; the first and second water-blocking plates are both circular plates with openings, the diameter of which matches the pipe diameter of the Venturi reducer, and the diameter of the openings is the same as the end diameter of the contraction and diffusion sections of the Venturi tube; the openings of the first and second water-blocking plates are located at the ends of the flared openings of the first and second water-stop plates respectively.

[0007] The liquid fertilizer mixing valve includes a valve housing, a base, a guide impeller, a throttling valve, a switching valve, a valve cover, and a control rod. The valve housing is a cylindrical structure, with the guide impeller, valve cover, throttling valve, switching valve, and base arranged axially from top to bottom inside. The base is a disc-shaped structure with three base posts at the bottom. These three base posts are hollow tubular structures, evenly distributed at 120° intervals around the center of the disc and penetrating the disc. A rotating shaft is located at the top center of the base. The valve cover, throttling valve, and switching valve are all discs with central openings. The rotating shaft passes through the central openings of the switching valve, throttling valve, and valve cover from bottom to top and is connected to the guide impeller. The guide impeller, valve cover, throttling valve, and switching valve can all rotate circumferentially around the rotating shaft. The valve cover has three valve cover holes, corresponding one-to-one with the positions of the three base posts. The throttling valve... The valve plate has 6 large throttling orifices and 6 small throttling orifices, distributed at 30° intervals around the center of the throttling valve plate. The distribution along the circumference is as follows: 3 large orifices, 1 small orifice, 2 large orifices, 2 small orifices, 1 large orifice, and 3 small orifices. The switching valve plate has 6 switching holes, grouped in sets of 2, with three groups of switching holes evenly distributed at 120° intervals around the center of the switching valve plate. One end of the control rod has a tenon. Both the throttling valve plate and the switching valve plate have 6 insertion slots on their circular edges, evenly distributed at 60° intervals around the center of the circular disc. The tenon matches the insertion slots. Both the throttling valve plate and the switching valve plate have elongated control holes parallel to the valve housing, the length of which is greater than one-sixth of the circumference of the valve housing. One end of the control rod can be inserted into the control hole and moved horizontally along the circumference.

[0008] The guide vane is a circular plate with several guide holes. The diameter of the circular plate matches the diameter of the front end of the branch pipe. The several guide holes are evenly distributed on the guide vane. The guide vane is located at the front end of the branch pipe and above the guide impeller.

[0009] Preferably, the branch pipe is flared and embedded inside the main pipe; the end diameter of the branch pipe is the same as and connected to the hole diameter on the bottom pipe wall of the Venturi reducer; the front end of the branch pipe is embedded inside the pipe wall of the main pipe; the front end diameter of the branch pipe is the same as the cylinder diameter of the valve body and is mounted on the top of the valve body.

[0010] Preferably, the throat diameters of the three venturi tubes are different, namely 30mm, 35mm and 40mm.

[0011] Preferably, the diameter of the bottom column, the diameter of the valve cover hole, the throttling orifice, and the switch hole are all 18mm, the diameter of the throttling orifice is 9mm, and the diameter of the guide hole is 1mm.

[0012] Preferably, the areas of the bottom post, valve cover hole, throttling orifice, throttling small orifice, and switch hole on their respective disks are all located at a distance of seven-tenths of the distance from the center of the disk.

[0013] Preferably, the first and second water-stop plates are both connected to the main pipe with a waterproof seal; the first and second water-blocking plates are both connected to the Venturi reducer with a waterproof seal; the valve cover is connected to the valve body with a waterproof seal; and the throttle valve plate and the switch valve plate are both connected to the valve body with waterproof bearings.

[0014] Preferably, the first water-stop plate, the second water-stop plate, the first water-blocking plate, the second water-blocking plate, the main pipe, the valve body, and the base are all made of PVC; the Venturi reducer, the switching valve plate, and the throttling valve plate are all made of stainless steel.

[0015] Preferably, the valve cover is fixed in position during installation, and a mark is engraved at the control hole corresponding to the position of the valve cover hole; the side of the switch valve disc is engraved with two types of markings: long lines and broken lines, corresponding to the switch hole and no hole, respectively; the side of the throttling valve disc is engraved with two types of markings: long lines and short lines, corresponding to the large throttling orifice and the small throttling orifice, respectively; both the switch valve disc and the throttling valve disc have 12 sets of scale lines distributed circumferentially, each set consisting of 3 marking lines, and the 12 sets of scale lines are distributed at 30° intervals from the center of the valve disc; the position of the scale lines on the switch valve disc corresponds to the position of the switch hole; the position of the scale lines on the throttling valve disc corresponds to the position of the large throttling orifice or the small throttling orifice.

[0016] The operating process of a liquid fertilizer proportioning combination valve includes the following steps:

[0017] Step 1) Connect the three bottom columns of the base to different types of liquid fertilizer delivery pipes respectively. Connect both ends of the main pipe of the main body to the irrigation water delivery pipe. When the irrigation water passes through the variable diameter Venturi tube, the Venturi effect is generated, and different types of liquid fertilizer are drawn into the liquid fertilizer mixing valve through the three bottom columns. Under the action of the guide impeller, they are fully mixed and enter the variable diameter Venturi tube through the guide plate to realize water and fertilizer integration.

[0018] Step 2) When it is necessary to change the type and ratio of the mixed liquid fertilizer, insert the tenon of the control rod into the socket through the control hole, move the control rod horizontally to drive the throttling valve plate and the switching valve plate to rotate in the circumferential direction, thereby adjusting the orientation of the throttling valve plate and the switching valve plate, and then adjusting the corresponding positions of the throttling large hole, the throttling small hole and the switching hole. The combination of scale lines at the marked position of the control hole is used as an indicator. A total of 27 different liquid fertilizer ratio combinations can be achieved by adjusting the control rod.

[0019] Step 3) When it is necessary to change the addition ratio of the mixed liquid fertilizer, the position of the three Venturi tubes in the Venturi reducer can be adjusted by adjusting the gears, so that a total of three different liquid fertilizer addition ratios can be achieved.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention relates to a liquid fertilizer mixing valve designed to meet the diverse needs of modern agricultural production using integrated water and fertilizer systems, allowing for the mixing of different types and proportions of liquid fertilizer. A variable-diameter venturi tube enables the adjustment of different fertilizer addition ratios, allowing for real-time adjustment of the fertilizer type and ratio to meet the nutritional requirements of various crops. The valve features a fully mechanical design, adaptable to various field operating environments, and offers advantages such as ease of operation, structural stability, and convenient maintenance. Attached Figure Description

[0022] Figure 1 This is a front view of the liquid fertilizer mixing valve.

[0023] Figure 2 An exploded view of a liquid fertilizer mixing valve;

[0024] Figure 3 This is a cross-sectional view of the liquid fertilizer mixing valve.

[0025] Figure 4 This is a structural diagram of a Venturi reducer;

[0026] Figure 5 This is a diagram showing the internal structure of a liquid fertilizer mixing valve.

[0027] Figure 6 This is a structural diagram of the base;

[0028] Figure 7 This is a schematic diagram of the throttle valve plate and its corresponding scale;

[0029] Figure 8 This is a schematic diagram of the switch valve plate and its corresponding scale;

[0030] Figure 9 This is a structural diagram of the guide vane;

[0031] Figure 1-9In the middle section: 1. First water-stop plate; 2. First water-baffle plate; 3. Venturi reducer; 3-1 Venturi tube; 4. Reducer gear; 5. Adjusting gear; 6. Main pipe; 6-1. Main pipe; 6-2. Branch pipe; 7. Guide plate; 7-1. Guide hole; 8. Valve cover; 8-1. Valve cover hole; 9. Switch valve plate; 9-1. Switch hole; 10. Valve housing; 10-1. Control hole; 11. Base; 11-1. Base column; 11-2. Rotating shaft; 12. Control rod; 12-1. Tenon; 12-2. Socket; 13. Throttling valve plate; 13-1. Throttling large orifice; 13-2. Throttling small orifice; 14. Guide impeller; 15. Second water-stop plate; 16. Second water-baffle plate; 17. Reducer Venturi tube; 18. Liquid fertilizer proportioning valve; A. Marking;

[0032] Figure 10 This is a schematic diagram of the operation of the throttle valve and the switching valve in Example 2;

[0033] Figure 11 This is a schematic diagram of the operation of the throttle valve and the switching valve in Example 2;

[0034] Figure 12 This is a schematic diagram of the operation of the throttle valve and the switching valve in Example 2, which is a case study 3. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0036] Example 1

[0037] A liquid fertilizer proportioning combination valve, such as Figure 1 , Figure 2 As shown, it includes a variable diameter venturi tube 17, a liquid fertilizer proportioning valve 18, and a flow guide 7; wherein the main pipe 6 of the variable diameter venturi tube 17 is installed on the valve body 10 of the liquid fertilizer proportioning valve 18, and the flow guide 7 is installed at the connection between the main pipe 6 and the valve body 10.

[0038] like Figure 2 , Figure 3 As shown, the variable diameter Venturi tube 17 includes a main pipe 6, a first water-stop plate 1, a second water-stop plate 15, a first water-blocking plate 2, a second water-blocking plate 16, a Venturi reducer 3, a reducer gear 4, and an adjusting gear 5; the main pipe 6 is a T-shaped tee pipe composed of a main pipe 6-1 and a branch pipe 6-2; the main pipe 6-1 is provided with the first water-stop plate 1, the first water-blocking plate 2, the Venturi reducer 3, the second water-blocking plate 16, and the second water-stop plate 15 in sequence along the axial direction; the branch pipe 6-2 is located below the main pipe 6-1 and is connected to the top of the valve body 10 of the liquid fertilizer proportioning valve 18.

[0039] like Figure 2-4As shown, the Venturi reducer 3 is a circular tube structure. A reducer gear 4 is circumferentially arranged on the rear section of the tube wall of the Venturi reducer 3. The reducer gear 4 is connected and matched with an adjusting gear 5. An opening is provided at a corresponding position on the tube wall of the main tube 6-1, through which the adjusting gear 5 protrudes to adjust the circumferential rotation of the Venturi reducer 3. The Venturi reducer 3 contains three Venturi tubes 3-1, evenly distributed at 120° intervals along the axial direction of the Venturi reducer 3. The constriction and diffusion sections of the three Venturi tubes 3-1 have the same end diameter. Holes are opened on the outward-facing tube walls of the throats of the three Venturi tubes 3-1. A hole is also opened on the bottom tube wall of the Venturi reducer 3. When one of the Venturi tubes 3-1 rotates circumferentially to the bottom of the main tube 6-1, the Venturi tube 3-... The holes at the throat, the holes on the bottom wall of the Venturi reducer 3, and the end openings of the branch pipe 6-2 correspond one-to-one; the first water-stopping plate 1 and the second water-stopping plate 15 are both circular plates with openings, the diameter of which matches the diameter of the main pipe 6-1, and the openings are all provided with frustum-shaped bell mouths. The bell mouths of the first water-stopping plate 1 and the second water-stopping plate 15 respectively fit into the contraction section and the diffusion section of the Venturi tube 3-1 located at the bottom of the main pipe 6-1 to form an extension structure; the first water-blocking plate 2 and the second water-blocking plate 16 are both circular plates with openings, the diameter of which matches the diameter of the Venturi reducer 3, and the diameter of the openings is the same as the end diameter of the contraction section and the diffusion section of the Venturi tube 3-1; the openings of the first water-blocking plate 2 and the second water-blocking plate 16 are respectively located at the end of the bell mouths of the first water-stopping plate 1 and the second water-stopping plate 15.

[0040] like Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, the liquid fertilizer mixing valve 18 includes a valve housing 10, a base 11, a guide impeller 14, a throttling valve plate 13, a switching valve plate 9, a valve cover 8, and a control rod 12; the valve housing 10 is a cylindrical structure, and the guide impeller 14, valve cover 8, throttling valve plate 13, switching valve plate 9, and base 11 are arranged sequentially from top to bottom along the axial direction inside it. The base 11 has a disc-shaped structure, with three base columns 11-1 at the bottom. The three base columns 11-1 are hollow tube structures, evenly distributed at 120° intervals around the center of the disc and penetrating the disc. A rotating shaft 11-2 is located at the center of the top of the base 11. The valve cover 8, throttling valve plate 13, and switching valve plate 9 are all discs with central holes. The rotating shaft 11-2 passes through the central holes of the switching valve plate 9, throttling valve plate 13, and valve cover 8 from bottom to top, and is connected to the guide impeller 14. The guide impeller 14, valve cover 8, throttling valve plate 13, and switching valve plate 9 can all rotate circumferentially around the rotating shaft 11-2.

[0041] like Figure 2 As shown, the valve cover 8 has 3 valve cover holes 8-1, which correspond one-to-one with the positions of the 3 bottom posts 11-1.

[0042] like Figure 7 As shown, the throttling valve plate 13 has 6 large throttling holes 13-1 and 6 small throttling holes 13-2, which are distributed at 30° intervals around the center of the throttling valve plate 13. The distribution along the circumference is as follows: 3 large holes, 1 small hole, 2 large holes, 2 small holes, 1 large hole, and 3 small holes.

[0043] like Figure 8 As shown, the switch valve plate 9 has 6 switch holes 9-1. Two switch holes 9-1 are grouped together. The two switch holes 9-1 in the same group are distributed at a distance of 30° from each other. The three groups of switch holes 9-1 are evenly distributed at a distance of 120° from each other with the center of the switch valve plate 9 as the center.

[0044] like Figure 2 , Figure 3 As shown, one end of the control rod 12 is provided with a tenon 12-1. The throttle valve plate 13 and the switch valve plate 9 each have 6 insertion ports 12-2 at their disc edges. The 6 insertion ports 12-2 are evenly distributed at 60° intervals around the center of the disc. The tenon 12-1 matches the insertion ports 12-2. The throttle valve plate 13 and the switch valve plate 9 each have an elongated control hole 10-1 at a location parallel to the valve housing 10. The length of the control hole 10-1 is greater than one-sixth of the circumference of the valve housing 10. One end of the control rod 12 can be inserted into the control hole 10-1 and move horizontally in the circumferential direction.

[0045] like Figure 2 , Figure 3 , Figure 9 As shown, the guide vane 7 is a circular disc with several guide holes 7-1. The diameter of the disc matches the diameter of the front end of the branch pipe 6-2. The several guide holes 7-1 are evenly distributed on the guide vane 7. The guide vane 7 is located at the front end of the branch pipe 6-2, above the guide impeller 14. The function of the guide vane 7 is to mix the fertilizer and water together through turbulence and to avoid excessively concentrated flow by increasing water resistance.

[0046] like Figure 3 As shown, the branch pipe 6-2 is flared and embedded in the main pipe 6-1; the end diameter of the branch pipe 6-2 is the same as and connected to the hole diameter on the bottom pipe wall of the Venturi reducer 3; the front end of the branch pipe 6-2 is embedded in the pipe wall of the main pipe 6-1; the front end diameter of the branch pipe 6-2 is the same as the cylinder diameter of the valve housing 10 and is mounted on the top of the valve housing 10.

[0047] In this embodiment, the throat diameters of the three venturi tubes 3-1 are different, namely 30mm, 35mm and 40mm.

[0048] In this embodiment, the diameter of the bottom column 11-1, the diameter of the valve cover hole 8-1, the throttling large hole 13-1, and the switch hole 9-1 are all 18mm, the diameter of the throttling small hole 13-2 is 9mm, and the diameter of the guiding hole 7-1 is 1mm.

[0049] In this embodiment, the areas of the bottom post 11-1, valve cover hole 8-1, throttling large hole 13-1, throttling small hole 13-2 and switch hole 9-1 on their respective disks are all located at a distance of seven-tenths of the circle's center.

[0050] In this embodiment, the first water-stopping plate 1 and the second water-stopping plate 15 are both connected to the main pipe 6-1 with a waterproof seal; the first water-blocking plate 2 and the second water-blocking plate 16 are both connected to the Venturi reducer 3 with a waterproof seal; the valve cover 8 is connected to the valve housing 10 with a waterproof seal; and the throttle valve plate 13 and the switch valve plate 9 are both connected to the valve housing 10 with a waterproof bearing.

[0051] In this embodiment, the first water-stopping plate 1, the second water-stopping plate 15, the first water-blocking plate 2, the second water-blocking plate 16, the main pipe 6, the valve shell 10, and the base 11 are all made of PVC material and are manufactured using casting. The Venturi reducer 3, the switching valve plate 9, and the throttling valve plate 13 are all made of stainless steel and are processed by a machining factory. The reducer gear 4, the adjusting gear 5, the control rod 12, and the guide impeller 14 are standard parts. Before production and processing, the flow rate of each pipe can be calculated using modeling methods, and then the pipe water passage area of ​​the Venturi reducer 3 and the throttling valve plate 13 can be adjusted according to the actual liquid fertilizer mixing ratio requirements, which significantly reduces the design cost.

[0052] The operating process of a liquid fertilizer proportioning combination valve includes the following specific steps:

[0053] (1) Connect the three bottom columns 11-1 at the bottom of the base 11 to different types of liquid fertilizer delivery pipes. Connect both ends of the main pipe 6-1 of the main pipe 6 to the irrigation water delivery pipe. When the irrigation water passes through the variable diameter Venturi tube 17, the Venturi effect is generated, and different types of liquid fertilizer are drawn into the liquid fertilizer ratio valve 18 through the three bottom columns 11-1. Under the action of the guide impeller 14, they are fully mixed and enter the variable diameter Venturi tube 17 through the guide plate 7 to realize water and fertilizer integration.

[0054] (2) When it is necessary to change the type and ratio of the mixed liquid fertilizer, insert the tenon 12-1 of the control rod 12 into the socket 12-2 through the control hole 10-1. Move the control rod 12 horizontally to drive the throttling valve plate 13 and the switching valve plate 9 to rotate in the circumferential direction, thereby adjusting the orientation of the throttling valve plate 13 and the switching valve plate 9, and then adjusting the corresponding positions of the throttling large orifice 13-1, the throttling small orifice 13-2 and the switching orifice 9-1. The smaller the orifice diameter, the greater the resistance of the pipeline, and the less fertilizer liquid can be drawn up. By adjusting the control rod 12, a total of 27 different liquid fertilizer ratio combinations can be achieved. The specific implementation process is as follows:

[0055] like Figure 1 , Figure 2 , Figure 6-8 As shown, the position of valve cover 8 is fixed during installation, and the control hole 10-1 corresponding to the position of valve cover hole 8-1 is marked with mark A; the pipes corresponding to the bottom column 11-1 are respectively input for N fertilizer, P fertilizer, and K fertilizer; the side of the disc of the switch valve plate 9 is marked with two types of markings: long lines and broken lines, corresponding to switch hole 9-1 and no hole, respectively; the side of the disc of the throttle valve plate 13 is marked with two types of markings: long lines and short lines, corresponding to throttle large hole 13-1 and throttle small hole 13-2, respectively; both the switch valve plate 9 and the throttle valve plate 13 have 12 sets of scale lines distributed circumferentially, each set Composed of 3 marking lines, 12 sets of scale lines are distributed at 30° intervals around the center of the valve plate; the scale line positions on the switch valve plate 9 correspond to the positions of the switch hole 9-1; the scale line positions on the throttling valve plate 13 correspond to the positions of the throttling large hole 13-1 or the throttling small hole 13-2; using the scale line combination at mark A of the control hole 10-1 as an identifier, broken lines, long lines, and short lines are named 0, 1, and 2 respectively, and the naming order is from top to bottom according to the scale line marking order. The corresponding 27 different liquid fertilizer ratio combinations are shown in Table 1 below:

[0056] Table 1 27 Liquid Fertilizer Ratio Combinations

[0057]

[0058]

[0059] For example, when the switch valve plate 9 is in the state of 000 at mark A, since the position of the valve cover 8 is fixed, all three valve cover holes 8-1 of the valve cover 8 are blocked by the position of the switch valve plate 9 without holes in this state. At this time, no matter how the throttle valve plate 13 rotates, the rising channels of the three liquid fertilizers in the bottom column 11-1 are blocked, so the flow rate is 0 (none).

[0060] For example, when the switch valve plate 9 is in state 111 at mark A, all three valve cover holes 8-1 of the valve cover 8 are connected to the switch hole 9-1 in this state. At this time, when the throttle valve plate 13 is rotated to state 111 at mark A, the three throttle orifices 13-2 on the throttle valve plate 13 are connected to the switch hole 9-1. Therefore, the liquid fertilizer in the bottom column 11-1 enters the variable diameter venturi tube 17 through the throttle orifice 13-2, the switch hole 9-1, and the valve cover hole 8-1 in sequence, realizing the small flow input of the three fertilizers. When the throttle valve plate 13 is rotated to state 222 at mark A, the three throttle orifices 13-1 on the throttle valve plate 13 are connected to the switch hole 9-1. Therefore, the liquid fertilizer in the bottom column 11-1 enters the variable diameter venturi tube 17 through the throttle orifice 13-1, the switch hole 9-1, and the valve cover hole 8-1 in sequence, realizing the large flow input of the three fertilizers.

[0061] (3) When it is necessary to change the addition ratio of mixed liquid fertilizer, adjust the position of the three Venturi tubes 3-1 in the Venturi reducer 3 by adjusting the gear 5. Since the pipe diameter of the main pipe 6-1 remains unchanged, the smaller the diameter of the throat of the Venturi tube 3-1, the greater the negative pressure generated after the water flows into the diffuser section, and the greater the suction force generated. In this way, a total of three different liquid fertilizer addition ratios can be achieved.

[0062] For example, by adjusting gear 5 to rotate the Venturi reducer 3 clockwise by 120°, if the diameter of the venturi tube 3-1 at the throat of the main pipe 6-1 is 35mm, then the diameter of the flow area is reduced to 35mm.

[0063] Example 2

[0064] This embodiment uses the operating process of Embodiment 1 to test the performance of the liquid fertilizer proportioning combination valve. A liquid fertilizer tank containing nitrogen, phosphorus, and potassium fertilizers is used as the fertilizer source. A digital flow meter is used to measure the flow rate of the liquid fertilizer proportioning combination valve. The mass of the liquid fertilizer tank is recorded before and after the test. The proportion of fertilizer elements in the water is calculated by calculating the difference between the filtration flow rate and the mass of the liquid fertilizer tank. The irrigation water flow rate is 20 m³ / h. 3 / h, using three different fertilizer formulation methods, as detailed below:

[0065] (1) Running Case 1: Figure 10 As shown in Table 1, combination 13 can be achieved by turning the switch valve 9 to mark A, which is 110 (the scale lines from top to bottom are two long lines and one short line), and at the same time turning the throttle valve 13 to mark A, which is 111 or 112 (the scale lines from top to bottom are three long lines or two long lines and one short line).

[0066] (2) Example 2: Figure 11As shown in Table 1, combination 23 is achieved by turning the switch valve 9 to mark A, which is 111 (the scale lines are three long lines from top to bottom), and simultaneously turning the throttle valve 13 to mark A, which is 211 (the scale lines are one short line and two long lines from top to bottom).

[0067] (3) Running Case 3: Figure 12 As shown in Table 1, combination 10 can be achieved by turning the switch valve 9 to mark A at 100 (the scale lines from top to bottom are one long line and two broken lines), and simultaneously turning the throttle valve 13 to mark A at 111, 121, 112 or 122 (the scale lines from top to bottom are three long lines, one long line and one short line and one long line, two long lines and one short line or one long line and two short lines).

[0068] Fertilizer ratio = (Fertilizer solution absorption volume × Proportion of fertilizer elements in the fertilizer solution) / Total flow rate. The calculated mixed fertilizer ratio for the liquid fertilizer mixing valve is shown in Table 2 below:

[0069] Table 2 Mixture ratio of liquid fertilizer

[0070]

[0071] The above embodiments illustrate and describe the basic principles, main features, and advantages of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should fall within the protection scope of the present invention.

Claims

1. A liquid fertilizer proportioning combination valve, characterized in that, It includes a variable diameter venturi tube, a liquid fertilizer proportioning valve, and a flow guide plate; wherein the main pipe of the variable diameter venturi tube is installed on the valve body of the liquid fertilizer proportioning valve, and the flow guide plate is installed at the connection between the main pipe and the valve body; The variable-diameter Venturi tube includes a main pipe, a first water-stop plate, a second water-stop plate, a first water-baffle plate, a second water-baffle plate, a Venturi reducer, a reducer gear, and an adjusting gear. The main pipe is a T-shaped tee consisting of a main pipe and branch pipes. The main pipe contains, axially, a first water-stop plate, a first water-baffle plate, a Venturi reducer, a second water-baffle plate, and a second water-stop plate. The branch pipe is located below the main pipe and is connected to the top of the valve body of the liquid fertilizer proportioning valve. The Venturi reducer is a circular tube type. The structure includes a circumferentially oriented reducer gear on the rear section of the Venturi reducer's tube wall, which engages and matches an adjusting gear. An opening is located on the corresponding position of the main tube wall, through which the adjusting gear protrudes to adjust the circumferential rotation of the Venturi reducer. The reducer contains three Venturi tubes, evenly distributed at 120° intervals along its axial direction. The converging and expanding sections of the three Venturi tubes have the same end diameter. All three Venturi tubes have openings on the outward-facing tube wall at the throat. The bottom tube wall of the Venturi reducer also has an opening. When one of the three Venturi tubes rotates circumferentially along the reducer to the bottom of the main pipe, the openings at the throat of the Venturi tube, the openings on the bottom tube wall of the reducer, and the end openings of the branch pipes correspond one-to-one. Both the first and second water-stop plates are circular plates with openings, the diameter of which matches the diameter of the main pipe. Each of the first and second water-stop plates has a frustum-shaped opening. The bell mouth of the first and second water-stop plates respectively fits into the contraction and diffusion sections of the Venturi tube located at the bottom of the main pipe to form an extension structure; the first and second water-blocking plates are both circular plates with openings, the diameter of which matches the pipe diameter of the Venturi reducer, and the diameter of the openings is the same as the end diameter of the contraction and diffusion sections of the Venturi tube; the openings of the first and second water-blocking plates are located at the ends of the bell mouths of the first and second water-stop plates respectively. The liquid fertilizer mixing valve includes a valve housing, a base, a guide impeller, a throttling valve, a switching valve, a valve cover, and a control rod. The valve housing is a cylindrical structure, with the guide impeller, valve cover, throttling valve, switching valve, and base arranged axially from top to bottom inside. The base is a disc-shaped structure with three base posts at the bottom. These three base posts are hollow tubular structures, evenly distributed at 120° intervals around the center of the disc and penetrating the disc. A rotating shaft is located at the top center of the base. The valve cover, throttling valve, and switching valve are all discs with central openings. The rotating shaft passes through the central openings of the switching valve, throttling valve, and valve cover from bottom to top and is connected to the guide impeller. The guide impeller, valve cover, throttling valve, and switching valve can all rotate circumferentially around the rotating shaft. The valve cover has three valve cover holes, corresponding one-to-one with the positions of the three base posts. The throttling valve... The valve plate has 6 large throttling orifices and 6 small throttling orifices, distributed at 30° intervals around the center of the throttling valve plate. The distribution along the circumference is as follows: 3 large orifices, 1 small orifice, 2 large orifices, 2 small orifices, 1 large orifice, and 3 small orifices. The switching valve plate has 6 switching holes, grouped in sets of 2, with three groups of switching holes evenly distributed at 120° intervals around the center of the switching valve plate. One end of the control rod has a tenon. Both the throttling valve plate and the switching valve plate have 6 insertion slots on their circular edges, evenly distributed at 60° intervals around the center of the circular disc. The tenon matches the insertion slots. Both the throttling valve plate and the switching valve plate have elongated control holes parallel to the valve housing, the length of which is greater than one-sixth of the circumference of the valve housing. One end of the control rod can be inserted into the control hole and moved horizontally along the circumference. The guide vane is a circular plate with several guide holes. The diameter of the circular plate matches the diameter of the front end of the branch pipe. The several guide holes are evenly distributed on the guide vane. The guide vane is located at the front end of the branch pipe and above the guide impeller.

2. The liquid fertilizer proportioning combination valve according to claim 1, characterized in that, The branch pipe is flared and embedded inside the main pipe; the end diameter of the branch pipe is the same as and connected to the hole diameter on the bottom pipe wall of the Venturi reducer; the front end of the branch pipe is embedded inside the pipe wall of the main pipe; the front end diameter of the branch pipe is the same as the cylinder diameter of the valve body and is mounted on the top of the valve body.

3. The liquid fertilizer proportioning combination valve according to claim 1, characterized in that, The throat diameters of the three venturi tubes are different, being 30 mm, 35 mm, and 40 mm respectively.

4. The liquid fertilizer proportioning combination valve according to claim 3, characterized in that, The diameter of the bottom column, the valve cover hole, the throttling orifice, and the switch hole are all 18 mm, the diameter of the throttling orifice is 9 mm, and the diameter of the guide hole is 1 mm.

5. The liquid fertilizer proportioning combination valve according to claim 1, characterized in that, The areas of the bottom post, valve cover hole, throttling orifice, throttling orifice, and switch hole on their respective disks are all located at a distance of seven-tenths of the circle's center.

6. The liquid fertilizer proportioning combination valve according to claim 1, characterized in that, The first and second water-stop plates are both connected to the main pipe with a waterproof seal; the first and second water-blocking plates are both connected to the Venturi reducer with a waterproof seal; the valve cover is connected to the valve body with a waterproof seal; the throttle valve plate and the switch valve plate are both connected to the valve body with waterproof bearings.

7. The liquid fertilizer proportioning combination valve according to claim 1, characterized in that, The first water-stop plate, the second water-stop plate, the first water-blocking plate, the second water-blocking plate, the main pipe, the valve body, and the base are all made of PVC; the Venturi reducer, the switching valve plate, and the throttling valve plate are all made of stainless steel.

8. The liquid fertilizer proportioning combination valve according to claim 1, characterized in that, The valve cover is fixed in position during installation, and a mark is engraved at the control hole corresponding to the position of the valve cover hole. The disc side of the switch valve plate has two types of markings: long lines and broken lines, corresponding to the switch hole and no hole, respectively. The disc side of the throttling valve plate has two types of markings: long lines and short lines, corresponding to the large throttling orifice and the small throttling orifice, respectively. Both the switch valve plate and the throttling valve plate have 12 sets of scale lines distributed circumferentially, each set consisting of 3 marking lines. The 12 sets of scale lines are distributed at 30° intervals from the center of the valve plate. The position of the scale lines on the switch valve plate corresponds to the position of the switch hole. The position of the scale lines on the throttling valve plate corresponds to the position of the large orifice or the small throttling orifice.

9. The operating process of a liquid fertilizer proportioning combination valve according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1) Connect the three bottom columns of the base to different types of liquid fertilizer delivery pipes respectively. Connect both ends of the main pipe of the main body to the irrigation water delivery pipe. When the irrigation water passes through the variable diameter Venturi tube, the Venturi effect is generated, and different types of liquid fertilizer are drawn into the liquid fertilizer mixing valve through the three bottom columns. Under the action of the guide impeller, they are fully mixed and enter the variable diameter Venturi tube through the guide plate to realize water and fertilizer integration. Step 2) When it is necessary to change the type and ratio of the mixed liquid fertilizer, insert the tenon of the control rod into the socket through the control hole, move the control rod horizontally to drive the throttling valve plate and the switching valve plate to rotate in the circumferential direction, thereby adjusting the orientation of the throttling valve plate and the switching valve plate, and then adjusting the corresponding position of the throttling large hole, the throttling small hole and the switching hole. The combination of scale lines at the marked position of the control hole is used as an indicator. A total of 27 different liquid fertilizer ratio combinations can be achieved by adjusting the control rod. Step 3) When it is necessary to change the addition ratio of the mixed liquid fertilizer, the position of the three Venturi tubes in the Venturi reducer can be adjusted by adjusting the gears, so that a total of three different liquid fertilizer addition ratios can be achieved.

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