Multi-stage siphon type low-cost farmland drainage system

Abstract

The invention discloses a multi-stage siphoning type low-cost farmland drainage system which comprises a water filter pipe assembly, a siphoning pipeline and an air exhaust pipeline, the water filter pipe assembly is distributed in farmland and inserted into soil, the siphoning pipeline and the air exhaust pipeline are arranged on the ground, and water collected in the water filter pipe assembly is sequentially communicated through the siphoning pipeline; wherein water collected in at least one water filter pipe assembly is communicated with the drainage end of the siphon pipeline, the drainage end of the siphon pipeline extends to a drainage position, the siphon pipeline is provided with a drainage control valve, the air suction pipeline is communicated with each section of pipe of the siphon pipeline and connected with an air suction pump, and one end of the air suction pipeline is provided with an air control valve. Air in the siphon pipeline can be pumped out through the air pumping pipeline when water drainage is started, so that negative pressure is formed in the siphon pipeline. The device is low in cost, flexible to use and easy to manage, and adjustment can be conducted according to the actual seepage condition of farmland stagnant water by adjusting the drainage control valve arranged on the siphon pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of farmland waterlogging control, and in particular to a multi-stage siphon type low-cost farmland drainage system. Background Art

[0002] Farmland waterlogging is a meteorological disaster, generally caused by continuous heavy rainfall. Waterlogging includes waterlogging and waterlogging. "Waterlogging" is the accumulation of water in farmland after rain, which exceeds the flood-resistance of crops. "Waterlogging" is mainly caused by the excessively high groundwater level, which leads to the soil being saturated with water frequently. There is too much water in the active layer of the crop root system, which is not conducive to the growth of crops, thus forming waterlogging disasters. In terms of the duration of the damage, waterlogging disasters are often much longer than the impact of a heavy rainfall process. "Waterlogging" and "waterlogging" coexist in most farmlands, so they are collectively referred to as "waterlogging disasters."

[0003] Waterlogging in farmland can cause serious harm to crops in farmland. Because a large amount of precipitation gathers in low-lying areas for a long time and cannot be discharged (waterlogging), or the groundwater level is continuously too high (waterlogging), the air content in the soil pores is reduced, making the soil too wet, the soil temperature low, the tillage, ventilation, and water permeability poor, the soil is in a latent reduction state for a long time, and effective nutrients are lacking. This soil characteristic will seriously affect the respiration of crop roots, causing crop roots to lack oxygen, metabolic waste to accumulate, nutrients to decrease, and even death. Therefore, long-term waterlogging will cause a large number of farmland crops to die, and even further cause a series of problems such as soil salinization, structural degradation, water pollution, and the spread of crop diseases.

[0004] The waterlogging conditions of farmland in various terrains are as follows: Although plain slopes have drainage systems and certain drainage capacity, under heavy rainfall conditions, disasters often occur due to overflow on the slopes or water accumulation in depressions. Plain depressions are similar to plain slopes, but due to the support of high water levels in rivers and lakes, they lose their self-drainage capacity or are blocked from drainage, or the drainage power is insufficient, which makes them prone to disasters. The valley-type terrain in mountainous areas is relatively low. When there is heavy rain or long-term rain, the soil contains a lot of water. The groundwater from the lower slopes of the surrounding hills invades the ground, causing poor water flow. In addition, the sunshine is short and the temperature is low, which causes waterlogging. Swamp plains have a gentle terrain, sparse river networks, shallow river channels, wide beaches, and low drainage capacity. In the rainy season, groundwater often reaches the surface, and the rainwater of the year may not be drained until the second year. Large-scale reclamation in swamp plains often causes frequent waterlogging disasters on newly reclaimed land due to the huge projects, low drainage standards, and the failure to timely match buildings.

[0005] At the same time, since many of my country's farmlands severely affected by waterlogging disasters have been transformed from swamps, during the formation and development of swamps, soil, permafrost and human activities all have an impact on the occurrence of waterlogging disasters: for example, soil with a high content of clay and clay particles has a small porosity, and the iron-aluminum oxides and secondary silicon oxides in the soil form a thicker impermeable layer, which prevents the infiltration of surface water and causes the surface to be too wet; for example, the permafrost layer in some areas forms a solid impermeable layer in the soil, affecting infiltration and aggravating the accumulation of surface water; and people's construction of flood retention areas and reservoirs in plains may cause backwater inundation and raise the groundwater level, which will also promote the formation of swamps, and so on.

[0006] In general, the prevention and control measures for farmland waterlogging disasters include raising the farmland terrain, raising the foundation around low-lying farmland, increasing the farmland drainage system to drain surface water, and artificially lowering the farmland groundwater level to an appropriate depth. However, in actual operations, for most farmland, artificially raising the terrain or raising the foundation of low-lying farmland requires too much engineering work and extremely high engineering costs. This method is acceptable in a small area, but it is not realistic to use this method on a large scale. Therefore, most waterlogging disaster areas currently prefer to adopt the method of increasing drainage systems.

[0007] The existing main drainage system is to build ditches for drainage, but since the occurrence of waterlogging disasters is greatly affected by climate, a large number of drainage ditches are idle in the non-rainy season, resulting in low ditch utilization. More seriously, as mentioned above, due to the poor permeability of some farmland soils, the upper layer of water is more stagnant, and a high-density ditch system is required to effectively drain water, but this will lead to problems such as excessive construction of ditch drainage systems, construction investment costs far exceeding benefits, and ditch systems occupying too much farmland area.

[0008] Therefore, the present invention designs a multi-stage siphon type low-cost farmland drainage system to solve the above problems. Summary of the invention

[0009] The object of the present invention is to provide a multi-stage siphon type low-cost farmland drainage system which is flexible in use.

[0010] The purpose of the present invention is achieved through the following technical solutions:

[0011] A multi-stage siphon type low-cost farmland drainage system, characterized in that it includes a water filter pipe assembly, a siphon pipe and an air suction pipe, the water filter pipe assembly is distributed in the farmland and inserted into the soil, the water filter pipe assembly can filter and collect the infiltrated water, the siphon pipe and the air suction pipe are arranged on the ground, the siphon pipe connects the water bodies collected in the water filter pipe assembly in sequence, wherein the water bodies collected in at least one water filter pipe assembly are connected to the drainage end of the siphon pipe, the drainage end of the siphon pipe extends to the drainage place, the water level of the water body at the drainage place is lower than the water level of the water body collected in the water filter pipe assembly, a drainage control valve is provided on the siphon pipe near the drainage end, the air suction pipe is respectively connected to each section of the siphon pipe, the air suction pipe is connected to the air suction pump, and an air control valve is provided at one end of the air suction pipe connected to the air suction pump; the air in the siphon pipe can be extracted through the air suction pipe when drainage starts, so that negative pressure is formed in the siphon pipe.

[0012] A further technical solution of the present invention is: a water filter pipe assembly comprises an outer pipe and an inner pipe, the outer pipe is provided with a water permeable section near the upper end and a water collecting section below the water permeable section, a plurality of first water filter holes are provided on the pipe wall of the water permeable section, the inner pipe is inserted into the outer pipe and is correspondingly located at the water permeable section, a plurality of second water filter holes are provided on the pipe wall of the inner pipe, a filter layer is provided between the outer wall of the inner pipe and the inner wall of the water permeable section, the water collecting section is used to collect water filtered by the filter layer, and the end of the siphon pipe for connecting with the water filter pipe assembly penetrates from the middle of the inner pipe and extends downward into the water collecting section.

[0013] A further technical solution of the present invention is that the lower end of the outer tube is a closed pointed end which is convenient for inserting into the soil.

[0014] A further technical solution of the present invention is: a first limiting ring is provided on the inner wall of the lower end of the water-permeable section of the outer tube, and a second limiting ring is provided on the upper end and the outer wall near the lower end of the inner tube respectively; when the inner tube is inserted and installed in the outer tube, the lower end of the inner tube passes through the first limiting ring, and the second limiting ring near the lower end of the inner tube is supported on the first limiting ring, and the outer side edge of the second limiting ring is against the inner wall of the outer tube.

[0015] A further technical solution of the present invention is: the filter layer is arranged on the outer wall of the inner tube in a circular cavity formed by second limiting circular rings at upper and lower ends.

[0016] A further technical solution of the present invention is that the filter layer comprises non-woven fabric.

[0017] A further technical solution of the present invention is: the siphon pipe includes multiple siphon connecting pipes and a siphon outlet pipe located at the tail end, the ends of the siphon connecting pipes are respectively inserted into two water filter pipe assemblies for connection, and finally the water filter pipe assemblies are connected in sequence, one end of the siphon outlet pipe is inserted into one of the water filter pipe assemblies, and the other end is the drainage end of the siphon pipe, and the siphon connecting pipe and the siphon outlet pipe are both connected to the exhaust pipe.

[0018] A further technical solution of the present invention is: the siphon pipe and the exhaust pipe are connected by an I-shaped connector, the I-shaped connector includes a siphon connecting sleeve, an exhaust connecting sleeve and a connecting pipe, the connecting pipe connects the siphon connecting sleeve and the exhaust connecting sleeve, the siphon connecting pipe and the siphon outlet pipe are both divided into two sections, the two sections are respectively inserted into the two ends of the siphon connecting sleeve of the I-shaped connector for connection, the exhaust pipe is provided with a plurality of exhaust pipes, the two ends of the exhaust pipes are respectively inserted into the exhaust connecting sleeves of two I-shaped connectors, and are sequentially connected into a connected pipe.

[0019] A further technical solution of the present invention is that the height difference between the water level of the water body at the drainage point and the water level of the water body collected in the water filter pipe assembly is equal to or greater than 0.5 meters.

[0020] A further technical solution of the present invention is that both the siphon pipe and the air extraction pipe are made of transparent plastic pipes.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The farmland drainage system of the present invention is composed of a water filter pipe assembly, a siphon pipe and an air extraction pipe, and there is no need to build a ditch system or other projects, which has a lower cost.

[0023] 2. The water filter pipe assembly of the present invention can be flexibly arranged in farmland. For example, a larger number of water filter pipe assemblies can be arranged in areas with serious waterlogging. The water filter pipe assemblies can be connected together through siphon pipes, which is very flexible to use.

[0024] 3. The siphon pipe and the exhaust pipe of the present invention are both arranged on the ground and do not need to be buried in the soil, so the assembly and disassembly are simpler. They can be installed according to the actual situation in the rainy season or in areas with long-term waterlogging, and can be dismantled when not in use.

[0025] 4. The farmland drainage system of the present invention only needs to use a small vacuum pump to provide power. When drainage begins, the air in the siphon pipe is extracted to form a negative pressure in the siphon pipe. After that, the vacuum pump can be stopped, and the total amount of energy consumed is extremely small.

[0026] 5. The drainage efficiency of the present invention is good and the management is relatively simple. By adjusting the drainage control valve provided on the siphon pipe, the actual seepage situation of stagnant water in the farmland can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a farmland drainage system according to an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of an outer tube of an embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of an inner tube according to an embodiment of the present invention;

[0030] Figure 4 is a schematic structural diagram of an outer tube of an embodiment of the present invention when inserted into the soil of a farmland;

[0031] Figure 5 is a schematic structural diagram of an inner tube of an embodiment of the present invention when inserted into an outer tube;

[0032] Figure 6 is a schematic structural diagram of a siphon connecting pipe of an embodiment of the present invention when it is inserted into a water filter pipe assembly;

[0033] Figure 7 1 is a schematic diagram of the structure of a siphon connecting pipe in an embodiment of the present invention connected to an exhaust pipe via an I-shaped connecting piece;

[0034] Figure 8 is a schematic structural diagram of the farmland drainage system of an embodiment of the present invention when in operation;

[0035] Fig. 9 is a structural schematic diagram of the farmland drainage system in the air extraction process according to an embodiment of the present invention;

[0036] Fig.10 It is a schematic diagram of the structure of the farmland drainage system arranged around the water collection well 9 according to an embodiment of the present invention;

[0037] Fig.11 It is a structural schematic diagram of an agricultural drainage system according to an embodiment of the present invention arranged on both sides of an existing drainage ditch.

[0038] Meaning of reference numerals in the figure:

[0039] 1- water filter pipe assembly; 1.1- outer pipe; 1.2- inner pipe; 1.3- water collection section; 1.4- water permeable section; 1.5- filter layer; 1.6- second limiting ring; 1.7- first limiting ring; 1.8- lower end of inner pipe; 1.9- first filter hole; 1.10-; second filter hole 2- siphon pipe; 2.1- siphon connecting pipe; 2.2- siphon outlet pipe; 2.3- end of siphon connecting pipe; 2.4- drainage end ; 3-exhaust pipe; 3.1-exhaust pipe; 4-I-shaped connector; 4.1-siphon connection sleeve; 4.2-exhaust connection sleeve; 4.3-connecting pipe; 5-drainage control valve; 6-air control valve; 7-farmland; 8-rubber plug; 9-water collection well; 10-areas with serious waterlogging; 11-drainage channel; 12-water level of the water body collected in the filter pipe assembly; 13-water level of the water body at the drainage point; 14-drainage ditch. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with embodiments.

[0041] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0043] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0044] Example:

[0045] like Figure 1 The multi-stage siphon type low-cost farmland drainage system of this embodiment is shown, including a water filter pipe assembly 1, a siphon pipe 2 and an air extraction pipe 3.

[0046] The water filter pipe assembly 1 is distributed in the farmland and inserted into the soil. The water filter pipe assembly 1 can filter and collect the infiltrated water. The water filter pipe assembly 1 specifically includes an outer pipe 1.1 and an inner pipe 1.2.

[0047] like Figure 2 As shown, the outer tube 1.1 is a stainless steel tube, with an open upper end and a closed tip at the lower end for easy insertion into the soil, an inner diameter of the outer tube 1.1 of 10 cm, and a wall thickness of 2 mm. The outer tube 1.1 is provided with a water-permeable section 1.4 near the upper end and a water-collecting section 1.3 located below the water-permeable section 1.4.

[0048] The distance between the upper end of the permeable section 1.4 and the upper end of the outer tube 1.1 is 10-20cm, and the length of the permeable section 1.4 is about 50cm (this length is the precipitation depth required for general farmland, and the length of this section can also be set according to the actual precipitation depth target). A plurality of first water filter holes 1.9 are provided on the tube wall of the permeable section 1.4. The diameter of the first water filter holes 1.9 is about 1mm, and the distance between each hole is maintained at about 0.5cm. A first limiting ring 1.7 is welded to the inner wall of the lower end of the permeable section 1.4 of the outer tube 1.1. The inner diameter of the first limiting ring 1.7 is equal to the outer diameter of the lower end 1.8 of the inner tube. The water collection section 1.3 is used to collect water filtered by the filter layer 1.5. The length of the water collection section 1.3 is about 30cm, and the specific length can be set according to the actual precipitation depth target.

[0049] like Figure 3 As shown, the inner tube 1.2 is a stainless steel tube with both upper and lower ends open. Its outer diameter is about 2 cm smaller than the inner diameter of the outer tube, and can also be adjusted according to the actual situation of impurities contained in the local groundwater or the selected filter layer. A plurality of second water filter holes 1.10 are arranged on the tube wall of the inner tube 1.2. The diameter of the second water filter holes 1.10 is about 1 mm, and the spacing between each hole is maintained at about 0.5 cm. The upper end and the outer wall near the lower end of the inner tube 1.2 are respectively welded with second limiting rings 1.6. The outer diameter of the second limiting ring 1.6 is equal to the inner diameter of the water permeable section 1.4 of the outer tube 1.1. The distance between the lower second limiting ring 1.6 and the lower end face of the inner tube 1.2 is about 5 cm. The outer wall of the inner tube 1.2 is surrounded by two upper and lower second limiting rings to form an annular cavity. The second water filter holes 1.10 are distributed in the annular cavity. The length of the annular cavity is consistent with the length of the water permeable section 1.4 of the outer tube 1.1. The filter layer 1.5 is filled in the annular cavity. The filter layer of this embodiment includes non-woven fabric, i.e. polyester fiber, which has technical characteristics such as wide application, mature technology, good stability, and low production cost. Compared with other filter materials of the same level, it has the advantages of stable quality, large dust holding capacity, strong moisture resistance, long service life, economy and durability. The non-woven fabric can be fixed in the circular cavity by binding.

[0050] When in use, multiple water filter pipe assemblies 1 will be arranged in the farmland 7. The arrangement of the water filter pipe assemblies 1 can be flexibly arranged according to the distribution of water accumulation in the farmland 7. For example, more water filter pipe assemblies 1 are arranged in areas with serious water accumulation, that is, the distribution of the water filter pipe assemblies 1 is more dense. When installing the water filter pipe assembly 1, the outer pipe 1.1 is vertically inserted into the soil of the farmland 7, the inner pipe 1.2 is inserted into the outer pipe 1.1 and is correspondingly located at the permeable section 1.4, the lower end 1.8 of the inner pipe is inserted into the first limiting ring 1.7, and the second limiting ring 1.6 near the lower end of the inner pipe 1.2 is supported on the first limiting ring 1.7, and the outer side of the second limiting ring 1.6 is close to the inner wall of the outer pipe 1.1. After the water filter pipe assembly 1 is installed, the accumulated water in the farmland will pass through the first water filter hole 1.9, the filter layer 1.5, and the second water filter hole 1.10 in sequence, and then fall into the water collection section 1.3 from the middle of the inner pipe 1.2.

[0051] The siphon pipe 2 and the exhaust pipe 3 are both made of transparent plastic pipes. The preferred solution is to use polycarbonate (PC) and polyvinyl chloride (PVC) materials. These two types of transparent plastics have high strength, high transparency, high mechanical properties and heat resistance, and are not easy to deform and wear-resistant.

[0052] The siphon pipe 2 is arranged on the ground, and the siphon pipe 2 sequentially connects the water collected in the water filter pipe assembly 1, wherein the water collected in at least one water filter pipe assembly 1 is connected to the drainage end 2.4 of the siphon pipe 2. The specific structure of the siphon pipe 2 of this embodiment is as follows: the siphon pipe 2 includes a plurality of siphon connecting pipes 2.1 and a siphon outlet pipe 2.2 located at the tail end, the diameters of the siphon connecting pipes 2.1 and the siphon outlet pipe 2.2 are 2-3 cm, the end 2.3 of the siphon connecting pipe extends vertically downward, the end 2.3 of the siphon connecting pipe penetrates from the middle of the inner pipe 1.2 and extends downward to the bottom of the water collection section 1.3, and extends into the collected water, and the two water filter pipe assemblies 1 are connected through a siphon connecting pipe 2.1, and finally the water filter pipe assemblies 1 are sequentially connected to form a multi-stage siphon structure. One end of the siphon outlet pipe 2.2 extends vertically downward and is inserted into one of the filter pipe assemblies 1. In this embodiment, it is inserted into the filter pipe assembly 1 at the end. The other end of the siphon outlet pipe 2.2 is the drainage end 2.4 of the siphon pipe 2. A drainage control valve 5 is provided on the siphon outlet pipe 2.2 near the drainage end 2.4. The drainage end 2.4 of the siphon pipe 2 extends to the drainage place and extends into the water body at the drainage place. The drainage place can be an existing ditch or a deep well. The horizontal height of the drainage end 2.4 of the siphon pipe 2 needs to be lower than the water level of the water body collected in the filter pipe assembly 1. Fig. 9 As shown, the water level 13 of the water body at the drainage is lower than the water level 12 of the water body collected in the water filter pipe assembly. The preferred solution is that the height difference between the water level 13 of the water body at the drainage and the water level 12 of the water body collected in the water filter pipe assembly is equal to or greater than 0.5 meters.

[0053] The exhaust pipe 3 is also arranged on the ground. The exhaust pipe 3 is connected with each section of the siphon connecting pipe 2.1 and the siphon outlet pipe 2.2 of the siphon pipe 2, respectively, and is specifically connected through an I-shaped connector 4. The I-shaped connector 4 includes a siphon connecting sleeve 4.1, an exhaust connecting sleeve 4.2 and a connecting pipe 4.3. The connecting pipe 4.3 connects the middle of the siphon connecting sleeve 4.1 and the exhaust connecting sleeve 4.2. The siphon connecting pipe 2.1 and the siphon outlet pipe 2.2 are both divided into two sections, and the two sections are respectively inserted into the two ends of the siphon connecting sleeve 4.1 of the I-shaped connector 4 for connection. The exhaust pipe 3 is provided with a plurality of exhaust pipes 3.1, and the diameter of the exhaust pipe 3.1 is 1-2 cm. The two ends of the exhaust pipe 3.1 are respectively inserted into the exhaust connecting sleeves 4.2 of the two I-shaped connectors 4, and are sequentially connected to form a connected pipe. After the connection of the exhaust pipe 3 is completed, one end of the frontmost exhaust connection sleeve 4.2 is not connected to the pipeline, and the end of the exhaust connection sleeve 4.2 not connected to the pipeline needs to be sealed with a rubber plug 8.

[0054] The tail end of the air extraction pipeline 3 is connected to the air extraction pump, and an air control valve 6 is provided at one end of the air extraction pipeline 3 connected to the air extraction pump. The air in the siphon pipeline 2 can be extracted through the air extraction pipeline 3 when drainage begins, so that negative pressure is formed in the siphon pipeline.

[0055] The specific installation steps of the farmland drainage system of this embodiment are as follows:

[0056] Step 1: Figure 4 As shown, the outer pipe 1.1 is vertically inserted into the farmland 7 where waterlogging disaster prevention and control is required. A plurality of water filter pipe assemblies 1 are arranged in the farmland 7 according to demand, and therefore a plurality of outer pipes 1.1 are inserted accordingly. The spacing between adjacent outer pipes 1.1 should be controlled to be above 3m and within 5m. The insertion depth of the outer pipe 1.1 needs to make the permeable section 1.4 of the outer pipe 1.1 completely immersed in the soil.

[0057] Step 2: If Figure 5 As shown, the inner tube 1.2 with the filter layer 1.5 tied thereto is vertically inserted into the outer tube 1.1, so that the lower end 1.8 of the inner tube passes through the first limiting ring 1.7, and the second limiting ring 1.6 below is supported on the first limiting ring 1.7.

[0058] Step 3: If Figure 6 As shown, the end 2.3 of the siphon connection pipe is passed through the middle of the inner pipe 1.2 and inserted into the water filter pipe assembly 1. The end 2.3 of the siphon connection pipe extends into the bottom of the water collection section 1.3, and the siphon outlet pipe 2.2 is inserted into the last water filter pipe assembly 1. Figure 8As shown, except for the first water filter pipe assembly 1 in which only one pipe end is inserted, the other water filter pipe assemblies 1 have two pipe ends inserted therein, and the depths of the two pipe ends should be kept consistent as much as possible.

[0059] Step 4: If Figure 7 As shown, each section of the siphon connecting pipe and the siphon outlet pipe is respectively inserted into the siphon connecting sleeve 4.1 of the corresponding I-shaped connecting piece 4, and the filter pipe assemblies 1 are connected in sequence to form a complete siphon pipeline 2.

[0060] Step 5: Insert each exhaust pipe 3.1 into the exhaust connecting sleeve 4.2 of the corresponding I-shaped connector 4, and connect them in sequence to form a complete exhaust pipeline 3, and seal the end of the front exhaust connecting sleeve 4.2 that is not connected to the pipeline with a rubber plug 8.

[0061] Step 6: Place the drainage end 2.4 of the siphon pipe 2 in a drainage well or drainage ditch. The water level in the drainage well or drainage ditch should maintain a height difference of more than 0.5 meters with the water level of the infiltrated water in the outer pipe.

[0062] Step 7: Connect the tail end of the air extraction pipe 3 to an air extraction pump, wherein the air extraction pump can be a low-power air extraction pump.

[0063] The farmland drainage system of this embodiment is connected through the above steps, and can be operated through the following operation method:

[0064] After the farmland drainage system is installed in the waterlogged area according to the above steps, the drainage control valve 5 is closed and left to stand for 2-3 hours. After the water collection section 1.3 of the outer pipe 1.1 is filled with infiltrated water, the air control valve 6 and the vacuum pump are opened. At this time, the vacuum pump extracts the air in the siphon pipe 2 and the vacuum pipe 3. Fig. 9 As shown, at this time, the pipeline above the ground is in a negative pressure state, and the infiltrated water collected in the water collection section 1.3 of the outer pipe 1.1 is in a positive pressure state due to the pressure of atmospheric pressure. At this time, the water infiltrated into the outer pipe 1.1 will reversely fill the siphon pipe 2 above the ground. When water is observed to enter the suction pipe 3, the air control valve 6 and the suction pump are closed, and the drainage control valve 5 is opened. At this time, the water in the water collection section 1.3 of the outer pipe 1.1 will move to the water collection section 1.3 of the connected outer pipe 1.1 in sequence under the action of siphon, and finally be discharged from the drainage end 2.4 of the siphon pipe 2. The specific water flow process can be referred to Figure 8 , Figure 8 The direction of the arrow in the middle is the direction of water flow. During use, the drainage control valve 5 can be appropriately adjusted according to the speed at which groundwater in the waterlogged area penetrates into the water collection section of the outer pipe to adjust the water outflow speed so that the drainage speed of the siphon pipe 2 is basically consistent with the water inflow speed of the water collection section 1.3 of the outer pipe 1.1.

[0065] In actual use, the farmland drainage system can be arranged in the farmland in a set manner according to the situation:

[0066] like Fig.10 As shown, the farmland drainage system is arranged around the same center of a circle, with the water collection well 9 as the center of the circle, and siphon pipes 2 are arranged in multiple radial directions. The drainage ends 2.4 of the siphon pipes 2 extend into the water collection well 9. A plurality of water filter pipe assemblies 1 are distributed on the arrangement path of the siphon pipes 2. The water filter pipe assemblies 1 are connected in sequence through the siphon pipes 2. When arranging the water filter pipe assemblies 1, more water filter pipe assemblies 1 can be arranged in the area 10 with more serious water accumulation, and the water in the water collection well 9 will be discharged to the target water body through the drainage channel 11.

[0067] like Fig.11 As shown, the farmland drainage system is arranged on both sides of the existing drainage ditch 14, and multiple siphon pipes 2 are arranged on both sides of the existing drainage ditch 14. The drainage ends 2.4 of the siphon pipes 2 are extended into the existing drainage ditch 14. Multiple water filter pipe assemblies 1 are distributed on the arrangement path of the siphon pipes 2. The water filter pipe assemblies 1 are connected in sequence through the siphon pipes 2. When arranging the water filter pipe assemblies 1, more water filter pipe assemblies 1 can be arranged in the area 10 with more serious water accumulation.

[0068] It can be seen that the farmland drainage system of the present invention is very flexible to use, has strong adaptability, and is easy to operate.

[0069] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in the art, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. A multi-stage siphon type low-cost farmland drainage system, characterized by: The utility model comprises a water filter pipe assembly, a siphon pipe and an air suction pipe, wherein the water filter pipe assembly is distributed in the farmland and inserted into the soil, the water filter pipe assembly can filter and collect the infiltrated water, the siphon pipe and the air suction pipe are arranged on the ground, the siphon pipe connects the water bodies collected in the water filter pipe assembly in sequence, wherein the water bodies collected in at least one of the water filter pipe assemblies are connected with the drainage end of the siphon pipe, the drainage end of the siphon pipe extends to the drainage place, the water level of the water body in the drainage place is lower than the water level of the water body collected in the water filter pipe assembly, a drainage control valve is provided on the siphon pipe near the drainage end, the air suction pipe is respectively connected with each section of the siphon pipe, the air suction pipe is connected with the air suction pump, and an air control valve is provided at one end of the air suction pipe connected with the air suction pump; the air in the siphon pipe can be extracted through the air suction pipe when drainage starts, so that negative pressure is formed in the siphon pipe.

2. The multi-stage siphon type low-cost farmland drainage system according to claim 1 is characterized in that: The water filter pipe assembly includes an outer pipe and an inner pipe, the outer pipe is provided with a water permeable section near the upper end and a water collecting section located below the water permeable section, the pipe wall of the water permeable section is provided with a plurality of first water filter holes, the inner pipe is inserted into the outer pipe and is located correspondingly at the water permeable section, the pipe wall of the inner pipe is provided with a plurality of second water filter holes, a filter layer is provided between the outer wall of the inner pipe and the inner wall of the water permeable section, the water collecting section is used to collect water filtered by the filter layer, and the end of the siphon pipe for connecting with the water filter pipe assembly penetrates from the middle of the inner pipe and extends downward into the water collecting section.

3. The multi-stage siphon type low-cost farmland drainage system according to claim 2 is characterized in that: The lower end of the outer tube is a closed pointed end for easy insertion into the soil.

4. The multi-stage siphon type low-cost farmland drainage system according to claim 2 is characterized in that: A first limiting ring is provided on the inner wall of the lower end of the water-permeable section of the outer tube, and a second limiting ring is provided on the upper end and the outer wall near the lower end of the inner tube respectively; when the inner tube is inserted and installed in the outer tube, the lower end of the inner tube passes through the first limiting ring, the second limiting ring near the lower end of the inner tube is supported on the first limiting ring, and the outer side edge of the second limiting ring is abutted against the inner wall of the outer tube.

5. The multi-stage siphon type low-cost farmland drainage system according to claim 4 is characterized in that: The filter layer is arranged on the outer wall of the inner tube in a circular cavity formed by second limiting circular rings at upper and lower ends.

6. The multi-stage siphon type low-cost farmland drainage system according to claim 2 is characterized in that: The filter layer includes nonwoven fabric.

7. The multi-stage siphon type low-cost farmland drainage system according to claim 1 is characterized by: The siphon pipe includes multiple siphon connecting pipes and a siphon outlet pipe located at the tail end. The ends of the siphon connecting pipes are respectively inserted into the two water filter pipe assemblies for connection. Finally, the water filter pipe assemblies are connected in sequence. One end of the siphon outlet pipe is inserted into one of the water filter pipe assemblies, and the other end is the drainage end of the siphon pipe. The siphon connecting pipe and the siphon outlet pipe are both connected to the exhaust pipe.

8. The multi-stage siphon type low-cost farmland drainage system according to claim 7 is characterized in that: The siphon pipe and the air extraction pipe are connected by an I-shaped connector, and the I-shaped connector includes a siphon connecting sleeve, an air extraction connecting sleeve and a connecting pipe, and the connecting pipe connects the siphon connecting sleeve and the air extraction connecting sleeve, and the siphon connecting pipe and the siphon outlet pipe are both divided into two sections, and the two sections are respectively inserted into the two ends of the siphon connecting sleeve of the I-shaped connector for connection, and the air extraction pipe is provided with a plurality of air extraction pipes, and the two ends of the air extraction pipe are respectively inserted into the two air extraction connecting sleeves of the I-shaped connectors, and are sequentially connected into a connected pipe.

9. The multi-stage siphon type low-cost farmland drainage system according to claim 1 is characterized in that: The height difference between the water level of the water body at the drainage point and the water level of the water body collected in the water filter pipe assembly is equal to or greater than 0.5 meters.

10. The multi-stage siphon type low-cost farmland drainage system according to claim 1, characterized in that: The siphon pipe and the air extraction pipe are both made of transparent plastic pipes.

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