Water-air coupling irrigation device

Abstract

The utility model discloses a kind of water-gas coupling irrigation devices, belong to agricultural irrigation technical field, including water-gas coupling mechanism and modular drip irrigation mechanism, water-gas coupling mechanism is connected with modular drip irrigation mechanism, water-gas coupling mechanism is used to even mix air into irrigation water with micro-bubble form, modular drip irrigation mechanism is used to deliver irrigation water handled by water-gas coupling mechanism to crop root zone, water-gas coupling mechanism includes water tank main body, inlet main pipeline, outlet main pipeline, blow-off pipeline, multifunctional detection assembly, flow guide component, multiple water level conveying mechanism and air pressure supply component. By the above-mentioned mode, using circulating aeration technology, water flow passes through Venturi jet device multiple times, generates huge micro-nano bubbles, forms uniform water-gas coupling, effectively avoids "chimney effect" and water-gas stratification.

Description

Technical Field

[0001] This utility model relates to the field of agricultural irrigation technology, specifically to a water-air coupled irrigation device. Background Technology

[0002] The balance of water, air, and heat in the soil is crucial for crop growth (known as the "fertility triangle"). Traditional irrigation, especially drip irrigation, removes air from the soil pores during the irrigation process, leading to short-term or periodic hypoxia in the root zone. This inhibits root respiration, affects the crop's absorption of water and nutrients, and ultimately results in reduced yield and lower quality.

[0003] To address this issue, existing technologies include "aeration irrigation" or "water-air coupled irrigation." For example, Chinese patent CN220000037U discloses an eccentric Venturi aerator for water-fertilizer-air coupled irrigation, comprising a contraction tube, a throat tube, and a diffuser tube connected in sequence. The end of the contraction tube away from the throat tube is connected to a water-fertilizer irrigation outlet connection pipe, and the end of the diffuser tube away from the throat tube is connected to a drip irrigation tape inlet connection pipe. An air tube is connected to the wall of the throat tube, and a one-way check valve is installed inside the air tube. The one-way check valve opens from the end of the air tube away from the throat tube toward the side where the throat tube is located.

[0004] However, the following shortcomings still exist in actual use: 1. The bubbles produced by the eccentric Venturi aerator are large and tend to merge and rise in the pipes, causing water and air to separate and resulting in uneven outflow of water and air in the field. 2. It is prone to the chimney effect, resulting in insignificant ventilation.

[0005] Therefore, there is an urgent need in this field for an irrigation system that can generate stable and uniform microbubbles, achieve efficient water-air mixing and transport, and be intelligently controlled.

[0006] Based on this, the present invention designs a water-air coupling irrigation device to solve the above problems. Utility Model Content

[0007] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a water-air coupling irrigation device.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A water-air coupling irrigation device includes a water-air coupling mechanism and a modular drip irrigation mechanism. The water-air coupling mechanism is connected to the modular drip irrigation mechanism. The water-air coupling mechanism is used to uniformly mix air into the irrigation water in the form of microbubbles. The modular drip irrigation mechanism is used to deliver the irrigation water treated by the water-air coupling mechanism to the crop root zone. The water-air coupling mechanism includes a water tank body, an inlet main pipe, an outlet main pipe, a sewage pipe, a multi-functional detection component, a flow guiding component, a multi-level water conveying mechanism, and a pressure supply component. The lower side of one end of the water tank body is fixedly connected to the inlet main pipe, the lower side of the other end of the water tank body is connected to the sewage pipe, and the upper side of the other end of the water tank body is connected to the fixed outlet main pipe. The multi-functional detection component, the flow guiding component, the multi-level water conveying component, the circulating aeration component, and the pressure supply component are connected to the water tank body. The end of the main water inlet pipe is fixedly connected to a perforated pipe, which extends to the lower end of the water tank body. The perforated pipe has multiple sets of equally spaced holes on its wall.

[0009] Furthermore, the multi-functional detection component includes a water level sensor, an air pressure sensor, a dissolved oxygen sensor, and a temperature sensor. All of these sensors are fixedly connected to the main body of the water tank. The water level sensor is used to detect the water level in the main body of the water tank. The water level sensor is connected to the multi-level water conveying component and the inlet solenoid valve. The air pressure sensor is used to detect the air pressure in the main body of the water tank. The dissolved oxygen sensor is used to detect the dissolved oxygen concentration in the water in the main body of the water tank. The temperature sensor is used to detect the water temperature in the main body of the water tank.

[0010] Furthermore, an inlet solenoid valve and a check valve are fixedly connected to the main inlet pipe. The inlet solenoid valve is used to control the opening and closing of the main inlet pipe, and the check valve is used to control the water flow to be delivered to the water tank body only from the outside. The water level sensor is electrically connected to the inlet solenoid valve.

[0011] Furthermore, an air circulation port is provided at the upper end of the water tank body. The Venturi jet is fixedly connected to the main water inlet pipe. The air circulation port is fixedly connected to the mixing chamber of the Venturi jet through a pipe. The mixing chamber of the Venturi jet is fixedly connected to the external fertilizer applicator.

[0012] Furthermore, an internal circulation inlet is provided at the top of one end of the main body of the water tank. The aeration circulation pump is a booster pump. The inlet of the aeration circulation pump is fixedly connected to the internal circulation inlet through a pipe. The outlet of the aeration circulation pump is fixedly connected to the main water inlet through a pipe. A one-way valve for controlling the direction of water flow is fixedly connected to the pipe. The pipe at the air outlet is connected to the inlet end of the Venturi jet.

[0013] Furthermore, the air pressure supply component includes an air compressor and a pressure safety valve. The air compressor is fixedly connected to the top of the water tank body via a pipe, and the pressure safety valve is fixedly connected to the upper end of the water tank body.

[0014] Furthermore, the multi-level water delivery component includes a low-level water outlet solenoid valve, a low-level water outlet pipe, a high-level water outlet solenoid valve, and a high-level water outlet pipe. The low-level water outlet pipe and the high-level water outlet pipe are respectively fixedly connected to the upper side of the other end of the water tank body. The high-level water outlet pipe is located above the low-level water outlet pipe. The water level sensor is electrically connected to the low-level water outlet solenoid valve and the high-level water outlet solenoid valve respectively. The low-level water outlet pipe and the high-level water outlet pipe are connected to the modular drip irrigation mechanism through pipes.

[0015] Furthermore, the modular drip irrigation mechanism includes multiple sets of detachably connected drip irrigation units. Each drip irrigation unit includes a fixed main pipe, a movable main pipe, an adjustment knob, a first stop, a second stop, a branch pipe, a drip irrigation tube, and a third stop. The fixed main pipe and the movable main pipe are connected in a limiting sliding connection. The adjustment knob is threadedly connected to the fixed main pipe, and the end of the adjustment knob abuts against the movable main pipe. The end of the branch pipe near the main outlet pipe is detachably connected to the fixed main pipe. The ends of different branch pipes are detachably connected. Two sets of symmetrical drip irrigation tubes are fixedly connected to both ends of the branch pipe. Multiple sets of equally spaced drip irrigation holes are opened on the drip irrigation tubes. The main outlet pipe is detachably connected to one of the fixed main pipes, and the main outlet pipe and the modular drip irrigation mechanism are interconnected.

[0016] Compared with the prior art, the advantages of this utility model are as follows: 1. Through the circulating aeration technology, the water flows through the Venturi jet multiple times, generating a huge number of micro-nano-scale bubbles, forming a uniform water-air coupling material, effectively avoiding the "chimney effect" and water-air stratification. 2. The modular drip irrigation mechanism allows for free adjustment of the length and width of the drip irrigation unit, thus adapting to different drip irrigation needs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a water-air coupling irrigation device according to the present invention; Figure 2 This is a schematic diagram of the modular drip irrigation mechanism of this utility model; Figure 3 This is a schematic diagram of the structure of the drip irrigation unit of this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the drip irrigation unit of this utility model. Figure 2 .

[0019] The labels in the diagram represent: 1. Aeration and circulation pump; 2. Check valve; 3. Inlet solenoid valve; 40. Low water level outlet solenoid valve; 41. Low water level outlet pipe; 5. Venturi jet injector; 6. Water tank body; 70. High water level outlet solenoid valve; 71. High water level outlet pipe; 8. Perforated pipe; 9. Water baffle; 10. Water level sensor; 11. Air pressure sensor; 12. Air compressor; 13. Pressure safety valve; 14. Dissolved oxygen sensor; 15. Temperature sensor; 16. Main inlet pipe; 17. Main outlet pipe; 18. Internal circulation inlet; 19. Sewage pipe; 20. Modular drip irrigation mechanism; 201. Fixed main pipe; 202. Moving main pipe; 203. Adjustment knob; 204. First stop; 205. Second stop; 206. Branch pipe; 207. Drip irrigation pipe; 208. Third stop. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-4 A water-air coupling irrigation device includes a water-air coupling mechanism and a modular drip irrigation mechanism 20. The water-air coupling mechanism is connected to the modular drip irrigation mechanism 20. The water-air coupling mechanism is used to uniformly mix air into the irrigation water in the form of microbubbles. The modular drip irrigation mechanism 20 is used to deliver the irrigation water treated by the water-air coupling mechanism to the crop root zone.

[0022] The water-air coupling mechanism includes a water tank body 6, an inlet main pipe 16, an outlet main pipe 17, a sewage pipe 19, a multi-functional detection component, a flow guiding component, a multi-level water conveying mechanism, and a pressure supply component. The lower side of one end of the water tank body 6 is fixedly connected to the inlet main pipe 16, the lower side of the other end of the water tank body 6 is connected to the sewage pipe 19, and the upper side of the other end of the water tank body 6 is connected to the fixed outlet main pipe 17. The multi-functional detection component, the flow guiding component, the multi-level water conveying component, the circulating aeration component, and the pressure supply component are connected to the water tank body 6.

[0023] The end of the main water inlet pipe 16 is fixedly connected to the perforated pipe 8, which extends to the lower end of the water tank body 6. Multiple sets of equally spaced holes are opened on the pipe wall of the perforated pipe 8.

[0024] The multi-functional detection component includes a water level sensor 10, an air pressure sensor 11, a dissolved oxygen sensor 14, and a temperature sensor 15. The water level sensor 10, air pressure sensor 11, dissolved oxygen sensor 14, and temperature sensor 15 are all fixedly connected to the water tank body 6. The water level sensor 10 is used to detect the water level in the water tank body 6. The water level sensor 10 is connected to the multi-level water conveying component and the water inlet solenoid valve 3. The air pressure sensor 11 is used to detect the air pressure in the water tank body 6. The dissolved oxygen sensor 14 is used to detect the dissolved oxygen concentration in the water in the water tank body 6. The temperature sensor 15 is used to detect the water temperature in the water tank body 6.

[0025] A water inlet solenoid valve 3 and a one-way valve 2 are fixedly connected to the main water inlet pipe 16. The water inlet solenoid valve 3 is used to control the opening and closing of the main water inlet pipe 16, and the one-way valve 2 is used to control the water flow to be delivered to the water tank body 6 from the outside. The water level sensor 10 is electrically connected to the water inlet solenoid valve 3.

[0026] An air circulation port is provided at the upper end of the water tank body 6. The Venturi jet 5 is fixedly connected to the main water inlet pipe 16. The air circulation port is fixedly connected to the mixing chamber of the Venturi jet 5 through a pipe. The mixing chamber of the Venturi jet 5 is fixedly connected to the external fertilizer applicator.

[0027] An internal circulation inlet 18 is provided on the upper part of one end of the main body 6 of the water tank. The aeration circulation pump 1 is a booster pump. The inlet of the aeration circulation pump 1 is fixedly connected to the internal circulation inlet 18 through a pipe. The outlet of the aeration circulation pump 1 is fixedly connected to the main water inlet pipe 16 through a pipe. A one-way valve 2 for controlling the direction of water flow is fixedly connected to the pipe. The pipe at the air outlet is connected to the water inlet of the Venturi jet 5.

[0028] The flow guiding component includes multiple sets of water-blocking guide plates 9, which are arranged crosswise inside the water tank body 6. The water-blocking guide plates 9 are fixedly connected to the inner wall of the water tank body 6. The water tank body 6 is used to optimize the water flow pattern and further promote water-air mixing.

[0029] The air pressure supply assembly includes an air compressor 12 and a pressure safety valve 13. The air compressor 12 is fixedly connected to the top of the water tank body 6 via a pipe, and the pressure safety valve 13 is fixedly connected to the upper end of the water tank body 6.

[0030] A water outlet solenoid valve and a one-way valve 2 are fixedly connected to the sewage pipe 19.

[0031] The multi-level water delivery assembly includes a low-level water outlet solenoid valve 40, a low-level water outlet pipe 41, a high-level water outlet solenoid valve 70, and a high-level water outlet pipe 71. The low-level water outlet pipe 41 and the high-level water outlet pipe 71 are respectively fixedly connected to the upper side of the other end of the water tank body 6. The high-level water outlet pipe 71 is located above the low-level water outlet pipe 41. The water level sensor 10 is electrically connected to the low-level water outlet solenoid valve 40 and the high-level water outlet solenoid valve 70 respectively. The low-level water outlet pipe 41 and the high-level water outlet pipe 71 are connected to the modular drip irrigation mechanism 20 through pipes.

[0032] In this invention, a pressure safety valve limit A, a pressure control upper limit B, and a dissolved oxygen controller target value range C are set according to production needs. The water level at the low-level outlet pipe 41 is denoted as D, and the water level at the high-level outlet pipe 71 is denoted as E. The main inlet pipe 16 is connected to an external water source. When the water level in the main water tank 6 is lower than that at the low-level outlet pipe 41, i.e., when the water level sensor 10 detects that the water level is less than D, the external control device receives a signal and controls the inlet solenoid valve 3 to open. The external water source is then transported to the main water tank 6 through the main inlet pipe 16 and the perforated pipe 8. Simultaneously, the Venturi jet injector 5 and the fertilizer applicator inject fertilizer solution into the main body of the water tank 6. When the water level sensor 10 detects that the water level is equal to D, the external control device receives the signal and controls the aeration circulation pump 1 to start. The water-fertilizer fluid in the main body of the water tank 6 is drawn out through the internal circulation port 18. After being pressurized by the aeration circulation pump 1, it passes through the Venturi jet injector 5. Under the action of pressure difference, the Venturi jet injector 5 draws in air from the top of the water tank through the air circulation port, forming a water-air mixture, which then flows back to the main body of the water tank 6. This process is repeated, and the number of microbubbles in the water increases continuously, and the dissolved oxygen concentration continues to rise. During the circulating aeration process, the air inside the main body of the water tank 6 is compressed and the pressure increases. When the air pressure sensor 11 detects that the pressure is greater than B, the external control device receives the signal and controls the pressure safety valve 13 to automatically release the pressure. When the water level sensor 10 detects that the water level has reached E, the external control device receives the signal and controls the water inlet solenoid valve 3 to close. When the dissolved oxygen sensor 14 detects that the dissolved oxygen value in the water reaches C, the external control device receives the signal and controls the aeration circulation pump 1 to shut down, stopping the circulation aeration. At this time, if the water level sensor 10 detects that the water level is greater than E, the external control device receives the signal and controls the high water level outlet solenoid valve 70 to open. The irrigation water in the water tank body 6 is transported to the modular drip irrigation mechanism 20 through the high water level outlet pipe 71 and the main outlet pipe 17. If the water level sensor 10 detects that the water level is greater than D and less than E, the external control device receives the signal and controls the low water level outlet solenoid valve 40 to open. The irrigation water in the water tank body 6 is transported to the modular drip irrigation mechanism 20 through the low water level outlet pipe 41 and the main outlet pipe 17. Irrigation will cause the water level to drop. When the water level sensor 10 detects that the water level is less than D, the external control device receives the signal and controls the low water level outlet solenoid valve 40 to close, and at the same time, the main inlet pipe 16 is opened again. By repeating the above steps, oxygen-rich water can be continuously and automatically provided to the modular drip irrigation mechanism 20 for irrigation. When sewage needs to be discharged, open the solenoid valve on the sewage discharge pipe 19 to drain the sewage through the sewage discharge pipe 19.

[0033] Example 2: In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, in a preferred embodiment of the present invention, the modular drip irrigation mechanism 20 includes multiple sets of detachably connected drip irrigation units. Each drip irrigation unit includes a fixed main pipe 201, a movable main pipe 202, an adjustment knob 203, a first stop 204, a second stop 205, a branch pipe 206, a drip irrigation pipe 207, and a third stop 208. The fixed main pipe 201 and the movable main pipe 202 are connected in a limiting sliding connection. The adjustment knob 203 is threadedly connected to the fixed main pipe 201. The end of the adjustment knob 203 abuts against the movable main pipe 202. One end of the branch pipe 206 near the main water outlet pipe 17 is detachably connected to the fixed main pipe 201. The ends of different branch pipes 206 are detachably connected. Two sets of symmetrical drip irrigation pipes 207 are fixedly connected to both ends of the branch pipe 206. Multiple sets of equally spaced drip irrigation holes are provided on the drip irrigation pipes 207.

[0034] The movable main tube 202 is threadedly connected to the adjacent adjustment knob 203, the fixed main tube 201 at the end is threadedly connected to the first stop 204, and the movable main tube 202 at the end is threadedly connected to the second stop 205.

[0035] The main water outlet pipe 17 is detachably connected to one of the modular drip irrigation mechanisms 20, and the main water outlet pipe 17 and the modular drip irrigation mechanism 20 are interconnected.

[0036] In this utility model, after adjusting the length of the movable main pipe 202 extending beyond the adjustment knob 203, tightening the adjustment knob 203 can fix the movable main pipe 202 and the adjustment knob 203. Through the detachable connection between the fixed main pipe 201 and the movable main pipe 202 and the detachable connection between the branch pipes 206, it can be adapted to drip irrigation fields of different sizes.

[0037] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended 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 will 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 water-air coupled irrigation device, comprising a water-air coupling mechanism and a modular drip irrigation mechanism (20), characterized in that: The water-air coupling mechanism is connected to the modular drip irrigation mechanism (20). The water-air coupling mechanism is used to uniformly mix air into the irrigation water in the form of microbubbles. The modular drip irrigation mechanism (20) is used to transport the irrigation water treated by the water-air coupling mechanism to the crop root zone. The water-air coupling mechanism includes a water tank body (6), an inlet main pipe (16), an outlet main pipe (17), a sewage pipe (19), a multi-functional detection component, a flow guiding component, a multi-level water conveying mechanism, and a pressure supply component. The lower side of one end of the water tank body (6) is fixedly connected to the inlet main pipe (16), the lower side of the other end of the water tank body (6) is connected to the sewage pipe (19), and the upper side of the other end of the water tank body (6) is connected to the fixed outlet main pipe (17). The multi-functional detection component, the flow guiding component, the multi-level water conveying component, the circulating aeration component, and the pressure supply component are connected to the water tank body (6). The end of the main water inlet pipe (16) is fixedly connected to the perforated pipe (8), which extends to the lower end of the water tank body (6). Multiple sets of equally spaced holes are opened on the pipe wall of the perforated pipe (8).

2. The water-air coupled irrigation device according to claim 1, characterized in that, The multi-functional detection component includes a water level sensor (10), an air pressure sensor (11), a dissolved oxygen sensor (14), and a temperature sensor (15). The water level sensor (10), air pressure sensor (11), dissolved oxygen sensor (14), and temperature sensor (15) are all fixedly connected to the water tank body (6). The water level sensor (10) is used to detect the water level in the water tank body (6). The water level sensor (10) is connected to the multi-water level conveying component and the water level sensor (10) is connected to the inlet solenoid valve (3). The air pressure sensor (11) is used to detect the air pressure in the water tank body (6). The dissolved oxygen sensor (14) is used to detect the dissolved oxygen concentration of the water in the water tank body (6). The temperature sensor (15) is used to detect the water temperature in the water tank body (6).

3. The water-air coupled irrigation device according to claim 2, characterized in that, A water inlet solenoid valve (3) and a check valve (2) are fixedly connected to the main water inlet pipe (16). The water inlet solenoid valve (3) is used to control the opening and closing of the main water inlet pipe (16), and the check valve (2) is used to control the water flow to be delivered to the water tank body (6) from the outside. The water level sensor (10) is electrically connected to the water inlet solenoid valve (3).

4. The water-air coupled irrigation device according to claim 1, characterized in that, An air circulation port is provided at the upper end of the water tank body (6). The Venturi jet (5) is fixedly connected to the main water inlet pipe (16). The air circulation port is fixedly connected to the mixing chamber of the Venturi jet (5) through the pipe. The mixing chamber of the Venturi jet (5) is fixedly connected to the external fertilizer applicator.

5. The water-air coupled irrigation device according to claim 4, characterized in that, An internal circulation inlet (18) is provided on the top of one end of the main body of the water tank (6). The aeration circulation pump (1) is a booster pump. The inlet of the aeration circulation pump (1) is fixedly connected to the internal circulation inlet (18) through a pipe. The outlet of the aeration circulation pump (1) is fixedly connected to the main water inlet pipe (16) through a pipe. A one-way valve (2) for controlling the direction of water flow is fixedly connected on the pipe. The pipe at the air outlet is connected to the inlet end of the Venturi jet (5).

6. The water-air coupled irrigation device according to claim 1, characterized in that, The air pressure supply assembly includes an air compressor (12) and a pressure safety valve (13). The air compressor (12) is fixedly connected to the top of the water tank body (6) through a pipe, and the pressure safety valve (13) is fixedly connected to the upper end of the water tank body (6).

7. The water-air coupled irrigation device according to claim 2, characterized in that, The multi-level water delivery assembly includes a low-level water outlet solenoid valve (40), a low-level water outlet pipe (41), a high-level water outlet solenoid valve (70), and a high-level water outlet pipe (71). The low-level water outlet pipe (41) and the high-level water outlet pipe (71) are respectively fixedly connected to the upper side of the other end of the water tank body (6). The high-level water outlet pipe (71) is located above the low-level water outlet pipe (41). The water level sensor (10) is electrically connected to the low-level water outlet solenoid valve (40) and the high-level water outlet solenoid valve (70) respectively. The low-level water outlet pipe (41) and the high-level water outlet pipe (71) are connected to the modular drip irrigation mechanism (20) through pipes.

8. The water-air coupled irrigation device according to claim 1, characterized in that, The modular drip irrigation mechanism (20) includes multiple sets of detachably connected drip irrigation units. Each drip irrigation unit includes a fixed main pipe (201), a movable main pipe (202), an adjustment knob (203), a first stop (204), a second stop (205), a branch pipe (206), a drip irrigation tube (207), and a third stop (208). The fixed main pipe (201) and the movable main pipe (202) are connected in a limiting sliding connection. The adjustment knob (203) is threadedly connected to the fixed main pipe (201). The end of the adjustment knob (203) is connected to the movable main pipe (202). The main pipe (202) is connected to the branch pipe (206), and the end of the branch pipe (206) near the main outlet pipe (17) is detachable from the fixed main pipe (201). The ends of different branch pipes (206) are detachably connected. Two sets of symmetrical drip irrigation pipes (207) are fixedly connected to both ends of the branch pipe (206). Multiple sets of equally spaced drip irrigation holes are opened on the drip irrigation pipe (207). The main outlet pipe (17) is detachably connected to one of the fixed main pipes (201), and the main outlet pipe (17) and the modular drip irrigation mechanism (20) are interconnected.

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