Rainwater collection and automatic irrigation integrated device for greening irrigation

Abstract

The invention relates to the technical field of greening irrigation, and discloses a rainwater collection and automatic irrigation integrated device for greening irrigation, the rainwater collection and automatic irrigation integrated device for greening irrigation comprises a tank body buried underground and a water inlet pipe, the tank body is internally provided with a water filtering disc assembly capable of vertically reciprocating, and an inner cavity of the tank body is divided into an upper chamber and a lower chamber; a pressure piston pump unit is arranged in the lower chamber, and the pressure chamber is communicated with the lower chamber through a water suction pipe provided with a first one-way valve and supplies water to an external drip irrigation pipeline through a water pressing pipe provided with a second one-way valve; an air cylinder and a pressure storage tank are arranged on the upper portion of the tank body, the air cylinder is in transmission connection with a water filter disc assembly and a pump piston, and an exhaust passage is provided with an adjustable throttling valve to control speed air release, so that the water filter disc assembly slowly moves downwards under the action of gravity, and delayed drip irrigation is achieved. An annular fence is arranged on the water filtering disc assembly, floating impurities are transferred to the periphery of the water filtering disc assembly through overflow, and when the water filtering disc assembly moves upwards to a preset slag discharging position, the discharging opening is communicated with the discharging channel in an aligned mode so that slag can be discharged in a concentrated mode.

Description

Technical Field

[0001] This invention relates to the field of greening irrigation technology, and in particular to an integrated rainwater collection and automatic irrigation device for greening irrigation. Background Technology

[0002] Green space irrigation systems typically require a stable and continuous water supply to meet the needs of plant growth, especially during hot and dry periods. Using large-volume, single-use irrigation can easily lead to increased surface runoff and evaporation losses, and the water may not be fully absorbed by plants in a short time. Meanwhile, rainwater resources are seasonal and intermittent, and there is often a lack of immediate rainwater replenishment during sunny and dry periods. Therefore, collecting and storing rainwater for use in green space drip irrigation has significant water-saving value and is in high demand.

[0003] Existing rainwater recycling irrigation systems typically consist of rainwater collection, storage, filtration, and pumping / valve-controlled irrigation systems. To achieve the low flow rate and long-term water supply required for drip irrigation, common solutions usually require the coordinated operation of electrical control components such as electric pumps, solenoid valves, controllers, and sensors. However, in scenarios such as green belts and road medians, the equipment is often buried underground or distributed in a decentralized manner, resulting in limited on-site power supply conditions, high wiring and maintenance costs, and the reliability of electrical control components is easily affected by long-term operation in humid environments, leading to difficulties in maintenance and high failure rates.

[0004] On the other hand, rainwater often contains silt, leaf debris, and suspended impurities. If filtration is insufficient or the filter / filter media layer becomes clogged, it can easily lead to blockage of drip irrigation lines and drippers, resulting in uneven irrigation or even failure. Existing filtration structures mostly use filter screens, filter cartridges, or sand filters. However, under intermittent rainwater supply conditions, the silt trapped inside the filter tends to dry or semi-dry during periods of water outage or low water levels, easily caking and solidifying, making subsequent cleaning difficult. At the same time, if impurities in the filter media layer are retained for a long time and solidify under dry conditions, it will cause blockage of the filter media pores and a decrease in filtration efficiency. In existing technologies, backwashing of filters and sludge removal and sewage discharge often require additional power or manual operation, making it difficult to automatically coordinate with the irrigation process. Maintenance is even more inconvenient under underground buried conditions.

[0005] Furthermore, in the scenario of area greening irrigation, multiple collection tanks or multiple irrigation nodes are usually required to work together. If the existing system adopts independent power supply and maintenance for each device, the overall construction cost is high and the management is complex; if centralized water supply and centralized control are adopted, a more complete electrical control and pipeline network system is required, which further increases the complexity of the project and the risk of failure.

[0006] Therefore, there is an urgent need for an integrated rainwater harvesting and automatic irrigation device that can adapt to intermittent rainwater supply and sunny irrigation conditions, and still achieve the delayed low-flow output required for drip irrigation under conditions of power shortage or inconvenience in power distribution, so as to reduce dependence on electric pump and valve systems and improve the adaptability of on-site deployment. Summary of the Invention

[0007] The purpose of this invention is to address the problem that rainwater harvesting irrigation systems in greening irrigation scenarios where there is a lack of electricity or inconvenience in laying electricity are unable to achieve the continuous and controllable small flow of water required for drip irrigation, and to provide an integrated rainwater harvesting and automatic irrigation device for greening irrigation.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: an integrated rainwater collection and automatic irrigation device for greening irrigation, comprising: The tank body has an internal water storage cavity, and the surface of the tank body is provided with a water inlet pipe that communicates with the water storage cavity; A water filter plate assembly is installed inside the tank and can move vertically up and down. The water filter plate assembly divides the inner cavity of the tank into an upper chamber located thereon and a lower chamber located thereon. The water filter plate assembly is provided with a filter media receiving structure for accommodating particulate filter media. A pressure piston pump unit fixedly installed in the lower chamber includes a pressure chamber and a pump piston installed in the pressure chamber. The pressure chamber is connected to a suction pipe and a discharge pipe. A first check valve is installed on the suction pipe to limit the water flow from the lower chamber into the pressure chamber. A second check valve is installed on the discharge pipe to limit the water flow from the pressure chamber to the outside. The outlet end of the discharge pipe extends to the outside of the tank. The pneumatic drive unit includes a cylinder fixed to the upper part of the tank. The telescopic end of the cylinder is connected to the filter plate assembly and the pump piston. The cylinder is equipped with an air inlet valve for connecting to an external air source and a pressure tank connected to the cylinder. An adjustable throttle valve is provided on the exhaust passage of the cylinder to limit the exhaust flow rate and limit the downward movement speed of the filter plate assembly during the release phase, so that the pump piston continuously pushes water out of the pressure chamber during the downward movement phase. A discharge channel is provided on the side wall of the tank and communicates with the upper chamber. The discharge channel is matched with a predetermined position of the filter plate assembly to discharge the water containing impurities and / or impurities in the upper chamber under a predetermined slag discharge condition. The reciprocating motion of the filter plate assembly drives the pressure piston pump unit to complete the water suction stroke and water pressure stroke, thereby forming a slag discharge condition that cooperates with the discharge channel.

[0009] Preferably, the upper side of the filter tray assembly is provided with an annular fence, the inner side of the annular fence forms a first sinking area, the bottom of the first sinking area is provided with filter holes and filled with granular filter media to form a filter media layer; the outer side of the annular fence forms a second sinking area, the second sinking area is used to contain water containing impurities and floating impurities overflowing from the first sinking area, and the outer periphery of the filter tray assembly is provided with an annular seal that slides with the inner wall of the tank.

[0010] The pore size of the filter in the first sinking area is smaller than the minimum particle size of the granular filter media, or a support mesh plate is provided at the bottom of the first sinking area to support the filter media layer; the surface of the filter disc assembly is provided with a discharge port that communicates with the second sinking area. When the filter disc assembly moves up to the predetermined slag discharge position, the second sinking area is aligned and connected with the discharge channel through the discharge port.

[0011] Preferably, the telescopic end of the cylinder is fitted with a pre-tensioning spring, the two ends of the pre-tensioning spring respectively abutting against the top wall of the tank and the water filter plate assembly, so that the water filter plate assembly has a first upper limit position and a second upper dead point position higher than the first upper limit position; under the first air supply pressure, the water filter plate assembly is driven by the cylinder to the first upper limit position to perform the drainage of the pressure piston pump unit; under the second air supply pressure higher than the first air supply pressure, the water filter plate assembly overcomes the pre-tensioning force of the pre-tensioning spring to reach the second upper dead point position and connects with the discharge channel to perform the slag discharge condition.

[0012] Preferably, the air inlet valve, the pressure tank, and the adjustable throttle valve are all connected to the rod chamber of the cylinder, and the rodless chamber of the cylinder is connected to the outside atmosphere.

[0013] A cylindrical filter is fixedly installed in the upper chamber. The water inlet pipe is connected to the inner cavity of the cylindrical filter. A push rod is fixedly installed on the filter disc assembly and slides into the inner cavity of the cylindrical filter. A sludge discharge pipe is fixedly installed at the upper opening of the cylindrical filter. The upper end of the sludge discharge pipe extends to the upper side of the tank. A baffle plate is provided at the connection between the sludge discharge pipe and the cylindrical filter.

[0014] An annular air sleeve is fixedly installed on the filter disc assembly. The annular air sleeve is slidably fitted on the outer surface of the cylindrical filter. Multiple purging nozzles are provided inside the annular air sleeve, and each purging nozzle is connected to the output end of an adjustable throttle valve through a hose.

[0015] Preferably, a maintenance feed port is fixedly installed on the top of the tank, and an indicator rod is fixedly installed on the water filter plate assembly, with the top end of the indicator rod extending into the maintenance feed port.

[0016] Preferably, a drain pipe is provided at the bottom of the tank and at the lowest point of the lower chamber, and the upper end of the drain pipe extends to the top of the tank and is provided with a suction port.

[0017] Preferably, the device includes multiple tanks, and the cylinder inlet ends of each tank are connected in parallel through a main air supply pipe, and a main valve and / or branch check valve are provided on the main air supply pipe.

[0018] The present invention has the following beneficial effects: 1. The irrigation device proposed in this invention, when irrigation mainly occurs during sunny, dry periods and when the source of rainwater is discontinuous, achieves pneumatic energy storage through a cylinder and a pressure tank. An adjustable throttle valve throttles the exhaust gas from the cylinder during the release phase, thereby controlling the downward movement speed of the filter tray assembly. This allows the pressure piston pump unit to continuously and adjustablely output drip irrigation water, achieving delayed drip irrigation water supply with little or no electrical control. At the same time, the controlled downward movement provides a stable duration window for water disturbance in the upper chamber and the rise of the water level on the upper side of the filter tray assembly, which is beneficial for floating impurities to complete the separation process of rising and migrating with the overflow during the irrigation cycle. By extending the water supply duration and reducing the instantaneous water output, high-temperature evaporation loss can be reduced, providing conditions for improving the effective absorption rate of water by plants.

[0019] 2. The irrigation device proposed in this invention, by setting a pre-tightening spring at the cylinder extension end, enables the filter disc assembly to have a first upper limit position and a second upper dead point position; under the first air supply pressure, the filter disc assembly only reaches the first upper limit position to perform irrigation pumping by the pressure piston pump unit without opening the discharge channel; under the second air supply pressure higher than the first air supply pressure, the filter disc assembly further overcomes the pre-tightening force to reach the second upper dead point, so that the discharge port and the discharge channel are aligned and connected and the slag discharge mode is performed, thereby achieving reliable switching between irrigation mode and slag discharge mode only by adjusting the air supply pressure level, avoiding additional electrically controlled valves or independent sewage discharge drive mechanisms, and improving controllability and maintenance convenience in underground buried environments.

[0020] 3. The irrigation device proposed in this invention has a filter disc assembly that reciprocates and is linked to the pump piston, so that the same motion chain can simultaneously complete the water intake and water pressure of the pressure chamber; and works with the annular fence to form a first sinking area and a second sinking area. During the aeration stage, the cylinder exhaust is throttled by an adjustable throttle valve, causing the filter disc assembly to slowly descend at a controlled speed under its own weight. This provides a continuous water flow disturbance and a time window for water level rise during each irrigation cycle formed by aeration. After aeration, the filter disc assembly slowly descends under the throttling and aeration effect. Water in the lower chamber enters the first sinking area from bottom to top through the filter holes located at the bottom of the first sinking area under the downward pressure of the filter disc assembly, forming a continuous upward flow disturbance. This causes the water level in the first sinking area to gradually rise and overflow over the annular fence. Floating impurities rise to the surface within this time window and are transferred to the second sinking area for temporary storage with the overflow water. As repeated aeration / irrigation cycles are performed, the migration of impurities to the second sinking area has a cumulative effect, causing impurities to gradually concentrate in the second sinking area. In the slag discharge mode, the second sinking area is centrally discharged through the discharge port and discharge channel. Since the filter disc assembly is normally submerged in the water inside the tank, the filter media remains in a moist environment even when the water level is low. Furthermore, impurities tend to accumulate in the second sinking area and can be discharged in a concentrated manner. This reduces the risk of impurities drying and caking in the filter media layer, leading to pore solidification, decreased filtration capacity, and blockage of drip irrigation lines, thereby improving filtration stability and system reliability.

[0021] 4. The irrigation device proposed in this invention has a cylindrical filter installed in the upper chamber for upstream pre-filtration of the incoming water. The sediment trapped inside the cylindrical filter tends to dry or semi-dry during rain intervals, water outages, or dry sunny periods. The trapped material is axially pressed by the push rod as the filter disc assembly moves upward, compacting it and squeezing it into the sludge discharge pipe for cumulative discharge. This, combined with the baffle screen, forms an interception and sludge-forming effect, improving the reliability of sludge discharge. At the same time, the annular air jacket purges the cylindrical filter, reducing its clogging probability and maintaining water flow capacity. The pre-filtration by the cylindrical filter reduces the load of sediment entering the filter media layer, which helps to extend the service life of the filter media and reduce the frequency of maintenance.

[0022] 5. The irrigation device proposed in this invention allows multiple tanks to be supplied with air in parallel through a main air supply pipe. A single pressurization at the centralized air supply point can drive multiple devices to work together, which facilitates large-scale drip irrigation coverage and subsequent expansion of green areas. Furthermore, maintenance of a single tank does not affect the operation of other tanks, thus improving system redundancy and operation and maintenance efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the irrigation device proposed in this invention. Figure 1 .

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the irrigation device proposed in this invention. Figure 2 .

[0025] Figure 3 This is a three-dimensional schematic diagram of the internal structure of the irrigation device proposed in this invention.

[0026] Figure 4 This is a schematic diagram of the front section structure of the irrigation device proposed in this invention.

[0027] Figure 5 This is a side cross-sectional schematic diagram of the irrigation device proposed in this invention.

[0028] Figure 6 This is a schematic diagram of the front section structure of the upper end of the tank body proposed in this invention. Figure 1 The water filter tray assembly moves slowly downwards.

[0029] Figure 7 This is a schematic diagram of the front section structure of the upper end of the tank body proposed in this invention. Figure 2 In this process, the water filter tray assembly is rapidly lifted upwards by the cylinder.

[0030] Figure 8 This is a schematic diagram of the front section of the water filter tray assembly proposed in this invention, wherein the water filter tray assembly is provided with a support mesh plate and a granular filter media layer.

[0031] In the picture: 100. Tank body; 101. Water inlet pipe; 102. Discharge channel; 103. Cartridge filter; 104. Sludge discharge pipe; 105. Baffle screen; 106. Inspection and feeding port; 107. Sewage discharge pipe; 200. Filter tray assembly; 202. Circular fence; 203. Discharge outlet; 204. Push rod; 205. Marking pole; 206. Supporting mesh plate; 301. Pressure chamber; 302. Pump piston; 303. Suction pipe; 304. Discharge pipe; 305. First check valve; 306. Second check valve; 401. Cylinder; 402. Inlet valve; 403. Pressure tank; 404. Adjustable throttle valve; 405. Preload spring; 500, annular air jacket; 600, main air supply pipe. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Example 1: Basic Structure and Working Process like Figures 1-8 As shown, this embodiment provides an integrated rainwater collection and automatic irrigation device for greening irrigation, including: a tank 100, a water inlet pipe 101, a water filter plate assembly 200, a pressure piston pump unit 300, a pneumatic drive unit 400, and a discharge channel 102.

[0035] The tank 100 is buried underground, forming a water storage cavity. The surface of the tank 100 is provided with a water inlet pipe 101 that communicates with the water storage cavity. For example, the inlet of the water inlet pipe 101 is connected to an underground rainwater ditch to introduce rainwater into the tank 100 for collection and storage. The side wall of the tank 100 is provided with a discharge channel 102 that communicates with the upper chamber. The bottom of the tank 100 is connected to the lowest point of the lower chamber with a sewage pipe 107. The upper end of the sewage pipe 107 extends to the top of the tank 100 and is provided with a suction interface. A maintenance and feeding port 106 is fixedly installed on the top of the tank 100.

[0036] refer to Figure 3 The filter tray assembly 200 is disposed inside the tank 100 and can move vertically up and down. The outer periphery of the filter tray assembly 200 is provided with an annular sealing element (such as a rubber lip ring / polyurethane scraper ring) that slides and engages with the inner wall of the tank 100. The filter tray assembly 200 divides the inner cavity of the tank 100 into an upper chamber located above it and a lower chamber located below it. The filter tray assembly 200 is provided with a filter media receiving structure for containing particulate filter media to filter the water in the upper chamber. An indicator rod 205 is fixedly installed on the filter tray assembly 200. The top end of the indicator rod 205 extends into the maintenance feed port 106 to indicate the position of the filter tray assembly 200 and assist in judging the status of the filter media.

[0037] refer to Figure 3The pressure piston pump unit 300 is fixedly installed in the lower chamber, and includes a pressure chamber 301 and a pump piston 302 installed in the pressure chamber 301. A suction pipe 303 and a pressure pipe 304 are connected to the bottom of the pressure chamber 301. A first one-way valve 305 is installed on the suction pipe 303 to limit the water flow from the lower chamber into the pressure chamber 301. A second one-way valve 306 is installed on the pressure pipe 304 to limit the water flow from the pressure chamber 301 to the outside. The outlet end of the pressure pipe 304 extends to the outside of the tank 100 and is connected to the drip irrigation pipeline to output drip irrigation water.

[0038] refer to Figure 4 , Figure 5 The pneumatic drive unit 400 includes a cylinder 401 fixed to the upper part of the tank 100. The telescopic end of the cylinder 401 is connected to the filter plate assembly 200 and the pump piston 302. The cylinder 401 is provided with an air inlet valve 402 for connecting to an external air source and a pressure tank 403 connected to the cylinder 401. An adjustable throttle valve 404 is provided on the exhaust passage of the cylinder 401 to limit the exhaust flow rate and limit the downward movement speed of the filter plate assembly 200 during the gas release stage. Specifically, the air inlet valve 402, the pressure tank 403, and the adjustable throttle valve 404 are all connected to the rod chamber of the cylinder 401, and the rodless chamber of the cylinder 401 is connected to the outside atmosphere.

[0039] The working process of this embodiment: When irrigation is needed, air is supplied to cylinder 401 and pressure tank 403 through air inlet valve 402. Cylinder 401 drives water filter plate assembly 200 to move upward, and at the same time drives pump piston 302 to move upward to form water suction stroke, so that water in the lower chamber enters pressure chamber 301 through first check valve 305. Subsequently, cylinder 401 enters the degassing stage. Compressed air in pressure tank 403 is discharged in a controlled manner under the throttling effect of adjustable throttle valve 404, causing the pressure in pressure tank 403 to gradually decrease. When the holding force exerted by cylinder 401 on the filter disc assembly 200 decreases with the pressure drop to less than the weight of the filter disc assembly 200 and its load, the filter disc assembly 200 begins to move downwards under gravity, and slowly moves downwards at a controlled speed under the control of the adjustable throttle valve 404 limiting the exhaust flow. The slow downward movement of the filter disc assembly 200 drives the pump piston 302 downwards, forming a water-pressing stroke. This causes water in pressure chamber 301 to be continuously pressed out through the water-pressing pipe 304 via the second one-way valve 306 and introduced into the drip irrigation network, achieving delayed, adjustable low-flow drip irrigation output. By adjusting the throttling opening of adjustable throttle valve 404, the drip irrigation output flow rate and duration can be adjusted. The above-mentioned air injection and degassing process can be repeated to achieve multiple irrigation cycles.

[0040] During the upward movement of the filter tray assembly 200, the water level on the upper side of the filter tray assembly 200 rises, and the deposited impurities are discharged from the discharge channel 102. Filter media is replenished to the filter tray assembly 200 through the maintenance feed port 106 for maintenance; the sludge deposited in the lower chamber is pumped out by connecting the sludge pump to the upper suction port of the sludge pipe 107.

[0041] Example 2: Specific structure of the water filter tray assembly 200 like Figure 3 As shown, based on Example 1, this example improves the filter tray assembly 200 to achieve the migration, accumulation and centralized discharge of floating impurities during multiple irrigation cycles.

[0042] A ring-shaped enclosure 202 is provided on the upper side of the filter tray assembly 200. A first sinking area is formed inside the ring-shaped enclosure 202. Filter holes are provided at the bottom of the first sinking area and granular filter media is filled to form a filter media layer. A second sinking area is formed outside the ring-shaped enclosure 202. Preferably, the pore size of the filter holes in the first sinking area is smaller than the minimum particle size of the granular filter media, such as... Figure 8 As shown, a support mesh plate 206 is set at the bottom of the first sinking area to support the filter material layer. The height of the annular fence 202 constitutes the overflow. That is, when the water level in the first sinking area exceeds the top height of the annular fence 202, the water overflows into the second sinking area.

[0043] The outer surface of the filter plate assembly 200 is provided with a discharge port 203 that communicates with the second sinking area. When the filter plate assembly 200 moves upward to a position where the discharge port 203 can be aligned and communicated with the discharge channel 102, this position is the predetermined slag discharge position. At the predetermined slag discharge position, the water containing impurities and floating impurities in the second sinking area can enter the discharge channel 102 through the discharge port 203 and be discharged from the tank 100.

[0044] During the gas release phase, such as Figure 8 As shown, the filter tray assembly 200 slowly moves downward under the speed control of the adjustable throttle valve 404. Since the filter holes are located at the bottom of the first sinking area, the water in the lower chamber mainly enters the first sinking area from bottom to top through the filter holes under the downward pressure of the filter tray assembly 200, forming a continuous upward flow disturbance. The filter holes limit the flow rate, causing the water level in the first sinking area to gradually rise and exceed the annular fence 202, resulting in overflow. Floating impurities rise during this duration and are transferred to the second sinking area for temporary storage with the overflow water. With repeated aeration to form multiple irrigation cycles, the above-mentioned rising, overflow migration, and temporary storage processes repeat, giving the migration of impurities to the second sinking area a cumulative effect, thus gradually concentrating the impurities in the second sinking area. Subsequently, under the slag discharge condition, the filter tray assembly 200 moves upward to the predetermined slag discharge position, aligning the second sinking area with the discharge channel 102 via the discharge port 203, thereby achieving centralized discharge of impurities within the second sinking area.

[0045] Example 3: Switching between irrigation and slag removal modes using dual pressure threshold switching. like Figure 4 , Figure 6 , Figure 7 As shown, based on Example 1 or Example 2, this example sets up a dual pressure threshold switching structure to achieve reliable switching between irrigation mode and slag discharge mode.

[0046] A pre-tension spring 405 is fitted onto the telescopic end of cylinder 401. The two ends of the pre-tension spring 405 abut against the top wall of tank 100 and the water filter plate assembly 200 respectively, so that the water filter plate assembly 200 forms a two-stage positioning state in the upward direction.

[0047] For ease of description, the following definitions apply: the first air supply pressure P1 is the normal irrigation air supply pressure; the second air supply pressure P2 is the slag discharge air supply pressure, and P2 is greater than P1. The first upper limit position is the upper limit position that the filter disc assembly 200 can reach when driven upward by the cylinder 401 under the first air supply pressure P1; the second upper stop position is the higher position that the filter disc assembly 200 can reach after overcoming the preload of the preload spring 405 under the second air supply pressure P2. The first air supply pressure P1 and the second air supply pressure P2 can be determined by calculation or experiment based on the preload of the preload spring 405, the effective area of ​​the cylinder 401, and the filter disc assembly 200 and its load weight, and must meet the requirements that under P1 the filter disc assembly 200 reaches the first upper limit position and the discharge port 203 is not connected to the discharge channel 102, and under P2 the filter disc assembly 200 reaches the second upper stop position and the discharge port 203 is aligned and connected to the discharge channel 102.

[0048] like Figure 6 As shown, when the filter tray assembly 200 reaches the first upper limit position under the first air supply pressure P1, the discharge port 203 and the discharge channel 102 remain misaligned and not connected. The device executes the irrigation mode and only performs drip irrigation pump output for water intake and pressure.

[0049] like Figure 7 As shown, when the filter tray assembly 200 reaches the second upper stop position under the second air supply pressure P2, the discharge port 203 and the discharge channel 102 are aligned and connected, and the device enters the slag discharge mode, allowing the water containing impurities and floating impurities temporarily stored in the second sinking area to be discharged through the discharge port 203 and the discharge channel 102. The irrigation mode and slag discharge mode can be switched by selecting the air supply pressure level P1 or P2. Preferably, the second air supply pressure P2 can be periodically provided after several irrigation cycles for slag discharge maintenance.

[0050] It should be noted that due to wear and tear or gradual reduction caused by slag discharge during long-term operation, the total weight of the filter disc assembly 200 and its load decreases accordingly. When the air supply pressure is maintained at the first air supply pressure P1 and the device is in the pouring mode, the upward movement height or effective stroke of the filter disc assembly 200 can change with the load, thereby changing the exposed height of the indicator rod 205 at the maintenance feed port 106. The exposed height of the indicator rod 205 can serve as a reference indicator of the filter media status, and users can determine whether filter media needs to be replenished by referring to the preset calibration range.

[0051] Example 4: Pre-filtration of cartridge filter 103 like Figure 7 As shown, based on any one of Embodiments 1 to 3, this embodiment provides an inlet pre-filtration and self-cleaning structure to reduce the load of mud and sand entering the filter media layer and improve the reliability of water flow.

[0052] A cylindrical filter 103 is fixedly installed in the upper chamber. The inlet pipe 101 communicates with the inner cavity of the cylindrical filter 103, allowing rainwater to enter the upper chamber after being filtered from the inside to the outside by the cylindrical filter 103. A push rod 204 is fixedly installed on the filter disc assembly 200 and slidably inserted into the inner cavity of the cylindrical filter 103. A sludge discharge pipe 104 is fixedly installed at the upper opening of the cylindrical filter 103, with the upper end of the sludge discharge pipe 104 extending to the upper side of the tank body 100; a baffle plate 105 is provided at the connection between the sludge discharge pipe 104 and the cylindrical filter 103.

[0053] During the upward movement of the filter disc assembly 200, the push rod 204 axially presses the silt trapped inside the cylindrical filter 103, compacting it and allowing it to accumulate and be discharged into the sludge discharge pipe 104. The baffle screen 105 intercepts and promotes the formation of sludge, improving the reliability of sludge discharge. Due to the intermittent nature of rainwater supply, the silt trapped inside the cylindrical filter 103 tends to dry or semi-dry during periods of water outage or dry, sunny weather. The pressurization by the push rod 204 reduces the risk of silt agglomeration and solidification, making it difficult to discharge.

[0054] Furthermore, an annular air sleeve 500 is fixedly installed on the filter disc assembly 200. The annular air sleeve 500 is slidably fitted onto the outer surface of the cartridge filter 103. Multiple purging nozzles are provided inside the annular air sleeve 500, and each purging nozzle is connected to the output end of the adjustable throttle valve 404 through a hose. The gas in the rod chamber of the cylinder 401 and the pressure tank 403 is delivered to the purging nozzles through the adjustable throttle valve 404 to purge the cartridge filter 103, which can reduce the probability of clogging and maintain water flow capacity.

[0055] Example 5: Regional application of multiple tanks with 100 units of gas supplied in parallel like Figure 1As shown, based on any one of Embodiments 1 to 4, this embodiment provides a region application structure.

[0056] The device comprises multiple tanks 100, with the air inlet ends of cylinders 401 in each tank 100 connected in parallel via a main air supply pipe 600. The main air supply pipe 600 is equipped with a main valve and / or branch check valves. By injecting air into the main air supply pipe 600 through a centralized air supply point, multiple devices can be driven to collaboratively complete the irrigation cycle. When slag removal maintenance is required, a second air supply pressure P2 can be supplied to the main air supply pipe 600, enabling each device to enter slag removal mode for centralized maintenance. This facilitates large-scale drip irrigation coverage and future expansion for green areas, and improves system redundancy and operational efficiency. If necessary, zoning valves can be installed on the main air supply pipe 600 to allow zoning areas to enter the second air supply pressure P2 for slag removal maintenance.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An integrated rainwater harvesting and automatic irrigation device for greening irrigation, characterized in that, include: The tank (100) has a water storage cavity inside, and the surface of the tank (100) is provided with a water inlet pipe (101) that communicates with the water storage cavity. A filter disc assembly (200) is installed inside the tank (100) and can move vertically up and down. The filter disc assembly (200) divides the inner cavity of the tank (100) into an upper chamber located thereon and a lower chamber located thereon. The filter disc assembly (200) is provided with a filter media receiving structure for accommodating particulate filter media. The piston pump unit of the pressure chamber (301) fixedly installed in the lower chamber includes the pressure chamber (301) and the pump piston (302) installed in the pressure chamber (301). The pressure chamber (301) is connected to the suction pipe (303) and the pressure pipe (304). The suction pipe (303) is provided with a first check valve (305) for limiting the water flow from the lower chamber to the pressure chamber (301). The pressure pipe (304) is provided with a second check valve (306) for limiting the water flow from the pressure chamber (301) to the outside. The outlet end of the pressure pipe (304) extends to the outside of the tank (100). The pneumatic drive unit includes a cylinder (401) fixed to the upper part of the tank (100). The telescopic end of the cylinder (401) is connected to the filter plate assembly (200) and the pump piston (302). The cylinder (401) is provided with an air inlet valve (402) for connecting to an external air source and a pressure tank (403) connected to the cylinder (401). An adjustable throttle valve (404) is provided on the exhaust passage of the cylinder (401) to limit the exhaust flow rate and limit the downward movement speed of the filter plate assembly (200) during the gas release stage, so that the pump piston (302) continuously pushes out the water in the pressure chamber (301) during the downward movement stage. A discharge channel (102) is provided on the side wall of the tank (100) and communicates with the upper chamber. The discharge channel (102) cooperates with a predetermined position of the filter plate assembly (200) to discharge the impurity-containing water and / or impurities in the upper chamber under a predetermined slag discharge condition. The reciprocating motion of the filter plate assembly (200) drives the piston pump unit of the pressure chamber (301) to complete the water suction stroke and water pressure stroke, thereby forming a slag discharge condition that cooperates with the discharge channel (102).

2. The integrated rainwater harvesting and automatic irrigation device for greening irrigation according to claim 1, characterized in that: The filter tray assembly (200) is provided with an annular fence (202) on the upper side. A first sinking area is formed inside the annular fence (202). Filter holes are provided at the bottom of the first sinking area and granular filter media are filled to form a filter media layer. A second sinking area is formed outside the annular fence (202). The second sinking area is used to accommodate water containing impurities and floating impurities overflowing from the first sinking area. The outer periphery of the filter tray assembly (200) is provided with an annular seal that slides with the inner wall of the tank (100).

3. The integrated rainwater harvesting and automatic irrigation device for greening irrigation according to claim 2, characterized in that: The pore size of the filter in the first sinking area is smaller than the minimum particle size of the granular filter media, or a support mesh plate (206) is provided at the bottom of the first sinking area to support the filter media layer; the surface of the filter tray assembly (200) is provided with a discharge port (203) that communicates with the second sinking area. When the filter tray assembly (200) moves up to the predetermined slag discharge position, the second sinking area is aligned and connected with the discharge channel (102) through the discharge port (203).

4. The integrated rainwater harvesting and automatic irrigation device for greening irrigation according to claim 1, characterized in that: The telescopic end of the cylinder (401) is fitted with a pre-tightening spring (405). The two ends of the pre-tightening spring (405) abut against the top wall of the tank body (100) and the filter plate assembly (200) respectively, so that the filter plate assembly (200) has a first upper limit position and a second upper dead point position higher than the first upper limit position. Under the first air supply pressure, the filter plate assembly (200) is driven by the cylinder (401) to the first upper limit position to perform the drainage of the piston pump unit of the pressure chamber (301). Under the second air supply pressure higher than the first air supply pressure, the filter plate assembly (200) overcomes the pre-tightening force of the pre-tightening spring (405) to reach the second upper dead point position and connects with the discharge channel (102) to perform the slag discharge condition.

5. The integrated rainwater harvesting and automatic irrigation device for greening irrigation according to claim 1, characterized in that: The air intake valve (402), the pressure tank (403), and the adjustable throttle valve (404) are all connected to the rod chamber of the cylinder (401), and the rodless chamber of the cylinder (401) is connected to the outside atmosphere.

6. The integrated rainwater harvesting and automatic irrigation device for greening irrigation according to claim 5, characterized in that: A cylindrical filter (103) is fixedly installed in the upper chamber. The water inlet pipe (101) is connected to the inner cavity of the cylindrical filter (103). A push rod (204) is fixedly installed on the filter disc assembly (200) and slidably inserted into the inner cavity of the cylindrical filter (103). A sludge discharge pipe (104) is fixedly installed at the upper opening of the cylindrical filter (103). The upper end of the sludge discharge pipe (104) extends to the upper side of the tank body (100). A baffle plate (105) is provided at the connection between the sludge discharge pipe (104) and the cylindrical filter (103).

7. The integrated rainwater harvesting and automatic irrigation device for greening irrigation according to claim 6, characterized in that: An annular air sleeve (500) is fixedly installed on the filter disc assembly (200). The annular air sleeve (500) is slidably sleeved on the outer surface of the cylindrical filter (103). Multiple purging nozzles are provided inside the annular air sleeve (500), and each purging nozzle is connected to the output end of the adjustable throttle valve (404) through a hose.

8. The integrated rainwater harvesting and automatic irrigation device for greening irrigation according to claim 1, characterized in that: The tank (100) is fixedly installed with a maintenance feeding port (106) on the top, and an indicator rod (205) is fixedly installed on the filter plate assembly (200), with the top end of the indicator rod (205) extending into the maintenance feeding port (106).

9. The integrated rainwater harvesting and automatic irrigation device for greening irrigation according to claim 1, characterized in that: The bottom of the tank (100) is connected to the lowest point of the lower chamber and a drain pipe (107) is provided. The upper end of the drain pipe (107) extends to the top of the tank (100) and is provided with a suction port.

10. A rainwater harvesting and automatic irrigation integrated device for greening irrigation according to any one of claims 1-9, characterized in that: The device includes multiple tanks (100), and the air inlet end of the cylinder (401) of each tank (100) is connected in parallel through a main air supply pipe (600). The main air supply pipe (600) is equipped with a main valve and / or a branch check valve.

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