Agricultural irrigation pipe anti-freezing protection device

Abstract

The utility model relates to pipeline anti -freezing technical field discloses an agricultural irrigation pipeline anti -freezing protection device, including last anti -freezing protection box with intermediate position anti -freezing protection box and first anti -freezing protection box and L -shaped fixed plate, last anti -freezing protection box with intermediate position anti -freezing protection box and first anti -freezing protection box are corresponding set up, and the intermediate position anti -freezing protection box is located the opposite side of last anti -freezing protection box and first anti -freezing protection box, when carrying out anti -freezing to agricultural irrigation pipeline, through the double anti -freezing mechanism of passive heat preservation and active heating, the passive level is closely wrapped irrigation pipeline through the heat preservation pipe, reduces the heat exchange of pipeline and outside cold air, and the active level is through closed loop hot water circulation, and the heat of 30 40 DEG C hot water is conducted to irrigation pipeline through heat preservation pipe, placement pipe, prevents the residual moisture in pipeline from ice expansion rupture, solves the problem that the traditional heat preservation layer only relies on in low temperature environment and is ineffective.

Description

Technical Field

[0001] This utility model relates to the field of pipeline antifreeze technology, specifically to an antifreeze protection device for agricultural irrigation pipelines. Background Technology

[0002] Agricultural irrigation pipelines are the core facilities for field water supply. In the low-temperature environment of winter, especially in northern regions, the residual irrigation water in the pipelines is prone to freezing and expansion, which can lead to pipeline rupture and directly affect the irrigation of spring planting the following year. At the same time, the length of irrigation pipelines in the field varies greatly, such as 5-50 meters for different plots, which places extremely high demands on the adaptability of antifreeze devices.

[0003] Currently, most existing antifreeze devices for agricultural irrigation pipelines in the industry adopt an integrated fixed structure, which relies solely on the insulation layer, such as foam or rock wool, for passive heat insulation. At low temperatures, the insulation layer cannot prevent the continuous loss of heat from the pipeline, and the residual water inside the pipeline will still freeze, leading to pipeline rupture. Therefore, an antifreeze protection device for agricultural irrigation pipelines is needed. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides an anti-freezing protection device for agricultural irrigation pipelines. It solves the problem that most existing anti-freezing devices for agricultural irrigation pipelines in the industry adopt an integrated fixed structure, which relies solely on the insulation layer, such as foam or rock wool, for passive heat insulation. At low temperatures, the insulation layer cannot prevent the continuous loss of heat from the pipeline, and the residual water inside the pipeline will still freeze, leading to pipeline rupture.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: an anti-freezing protection device for agricultural irrigation pipes, comprising a final anti-freezing protection box, a middle position anti-freezing protection box, a first anti-freezing protection box, and an L-shaped fixing plate. The final anti-freezing protection box, the middle position anti-freezing protection box, and the first anti-freezing protection box are arranged in a front-to-back correspondence, and the middle position anti-freezing protection box is located on the opposite side of the final anti-freezing protection box and the first anti-freezing protection box. Among them, the last antifreeze protection box, the middle antifreeze protection box and the first antifreeze protection box are all fixedly installed with irrigation pipe placement pipes, and the outer walls of the three irrigation pipe placement pipes are all fixedly sleeved with heat insulation pipes. The front surfaces of both the middle and last antifreeze protection boxes have two mounting holes that communicate with their interiors. Among them, the front surface of the insulation pipe inside the last antifreeze protection box and the middle antifreeze protection box is provided with a socket that communicates with the inside of the pipe, and the socket corresponds to the mounting hole.

[0006] Preferably, the rear surface of the internal insulation pipe of the middle antifreeze protection box and the last antifreeze protection box is fixedly connected to a hot water delivery pipe that communicates with its interior. The four hot water delivery pipes are respectively inserted into the inner walls of the corresponding mounting holes and insertion holes.

[0007] Preferably, a water outlet pipe communicating with the interior is fixedly connected below the rear surface of the internal insulation pipe of the last antifreeze protection box. The rear end of the water outlet installation pipe extends through the rear surface of the final antifreeze protection box, and a connecting pipe communicating with its interior is fixedly connected to the rear end of the water outlet installation pipe.

[0008] Preferably, two rectangular slots are provided on both the front and rear sides of the upper surface of the antifreeze protection box in the middle position; Among them, two identical rectangular slots are opened on the front side of the top surface of the last antifreeze protection box; The first antifreeze protection box has two identical rectangular slots on the rear side of its upper surface.

[0009] Preferably, two rectangular plates are fixedly connected to both the left and right sides of the antifreeze protection box in the middle position; Among them, two identical rectangular plates are fixedly connected to both the left and right sides of the final antifreeze protection box; The first antifreeze protection box has two identical rectangular plates fixedly connected to both its left and right sides; Multiple rectangular plates are provided with second mounting holes; There are multiple antifreeze protection boxes in the middle position, and the structures of these multiple antifreeze protection boxes are completely identical.

[0010] Preferably, a heating box is fixedly connected to the upper surface of the first antifreeze protection box, and a water inlet pipe identical to the one inside the heating box is fixedly connected to the rear surface of the heating box. The front surface of the heating box is fixedly connected to a water outlet pipe identical to the one inside, and the water outlet pipe is fixedly connected to the connector. Both the inlet and outlet pipes are equipped with switch valves.

[0011] Preferably, a cooling box is provided on the left side of the last antifreeze protection box, and a water pump is fixedly installed on the right side of the cooling box, with the output end of the water pump communicating with the interior of the cooling box. The connecting pipe is fixedly connected to the input end of the water pump; The front surface of the cooling box is fixedly equipped with a delivery pump. The input end of the delivery pump is connected to the inside of the cooling box, and the output end of the delivery pump is fixedly connected to a delivery pipe, which is fixedly connected to the heating box.

[0012] Preferably, the L-shaped fixing plate has a first mounting hole, and a handle is fixedly connected to the left side of the L-shaped fixing plate; Among them, two rectangular clips are fixedly connected to the lower surface of the L-shaped fixing plate, and the lower ends of the two rectangular clips are engaged into adjacent rectangular clip slots; There are multiple L-shaped fixing plates, and the structures on the multiple L-shaped fixing plates are completely identical; The second mounting hole is connected in series with the two adjacent first mounting holes by a fixing screw, and a fixing nut is provided on the fixing screw.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a frost protection device for agricultural irrigation pipes, which has the following beneficial effects: When protecting agricultural irrigation pipes from freezing, a dual antifreeze mechanism of passive insulation and active heating is employed. The passive layer involves tightly wrapping the irrigation pipe with an insulation pipe to reduce heat exchange between the pipe and the cold outside air. The active layer utilizes a closed-loop hot water circulation system, transferring heat from 30-40℃ hot water through the insulation and placement pipes to the irrigation pipe, preventing residual moisture inside the pipe from freezing, expanding, and cracking. This solves the problem of traditional insulation layers failing to protect against freezing in low-temperature environments. Furthermore, the modular design allows for flexible adjustment of the number of antifreeze protection boxes in the middle sections based on the actual length of the irrigation pipe, adapting to irrigation needs across different spans in the field. This effectively addresses the issue of traditional integrated antifreeze devices being unable to accommodate pipes of varying lengths, flexibly addressing various field pipe layout scenarios. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the agricultural irrigation pipeline antifreeze protection device of this utility model; Figure 2 This is a schematic diagram of the entire utility model from the right side. Figure 3 This is a schematic diagram of the hot water delivery pipe of this utility model; Figure 4 This is a schematic diagram of the socket of this utility model; Figure 5 This is a schematic diagram of the first mounting hole of this utility model.

[0015] In the diagram: 1. Final antifreeze protection box; 2. L-shaped fixing plate; 3. Middle position antifreeze protection box; 4. Rectangular plate; 5. Delivery pipe; 6. Heating box; 7. Water outlet pipe; 8. Connector; 9. First antifreeze protection box; 10. First mounting hole; 11. Delivery pump; 12. Cooling box; 13. Water outlet installation pipe; 14. Connecting pipe; 15. Water pump; 16. Insulation pipe; 17. Hot water delivery pipe; 18. Second mounting hole; 19. Rectangular slot; 20. Insertion hole; 21. Irrigation pipe placement pipe; 22. Rectangular clamping plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-5 This utility model provides a new technical solution: an anti-freezing protection device for agricultural irrigation pipes, including a final anti-freezing protection box 1: the final anti-freezing protection box 1, the intermediate anti-freezing protection box 3, and the first anti-freezing protection box 9 are arranged in a front-to-back correspondence. The final anti-freezing protection box 1 provides a protective space for the end of the irrigation pipe. The rectangular slot 19 and the rectangular plate 4 cooperate to achieve splicing and fixing with the intermediate anti-freezing protection box 3.

[0018] The middle position antifreeze protection box 3 is set up in a front-to-back manner with the last antifreeze protection box 1 and the first antifreeze protection box 9. The middle position antifreeze protection box 3 is used to connect the last antifreeze protection box 1 and the first antifreeze protection box 9. The number can be flexibly increased or decreased according to the length of the irrigation pipeline to adapt to the field irrigation needs of different spans.

[0019] First antifreeze protection box 9: The first antifreeze protection box 9, the middle antifreeze protection box 3, and the last antifreeze protection box 1 are set in a front-to-back correspondence. The upper surface of the first antifreeze protection box 9 is fixedly connected to the heating box 6. The first antifreeze protection box 9 provides a protective space for the front end of the irrigation pipe, and at the same time carries the heating box 6 to provide a heat source for the circulation system.

[0020] Irrigation pipe placement pipe 21: Irrigation pipe placement pipe 21 is fixedly installed inside the last antifreeze protection box 1, the middle antifreeze protection box 3, and the first antifreeze protection box 9. The outer wall of the irrigation pipe placement pipe 21 is fixedly sleeved with an insulation pipe 16. The irrigation pipe placement pipe 21 is used to accommodate agricultural irrigation pipes, provide stable support for the pipes, and transfer heat from the insulation pipe 16 to the hot water, preventing the pipes from directly contacting cold air.

[0021] Insulation pipe 16: The insulation pipe 16 reduces the heat exchange between the irrigation pipe and the outside cold air through the insulation material, achieving passive antifreeze, while providing a channel for hot water circulation and supplementing the pipe with heat through heat conduction.

[0022] Hot water delivery pipe 17: Hot water delivery pipe 17 is used to connect the insulation pipe 16 in the adjacent protection box, so that hot water can flow smoothly between each insulation pipe 16 to form a complete circulation channel.

[0023] Rectangular plate 4: Rectangular plate 4 provides support points for splicing protective boxes. The second mounting hole 18 cooperates with the first mounting hole 10 of the L-shaped fixing plate 2 to reinforce adjacent protective boxes through fixing screws.

[0024] Rectangular slots 19: Rectangular slots 19 are respectively opened on the front side of the upper surface of the last antifreeze protection box 1, the front and rear sides of the upper surface of the middle antifreeze protection box 3, and the rear side of the upper surface of the first antifreeze protection box 9. The rectangular slots 19 are all set on the left and right sides respectively. The rectangular slots 19 provide the locking space for the rectangular card plate 22 of the L-shaped fixing plate 2, realize the initial positioning of adjacent protection boxes, and avoid lateral offset during splicing.

[0025] L-shaped fixing plate 2: The L-shaped fixing plate 2 is inserted into the rectangular slot 19 of the adjacent protection box by the rectangular card plate 22 to achieve initial positioning. The first mounting hole 10 cooperates with the second mounting hole 18 of the rectangular plate 4. The adjacent protection box is reinforced by the fixing screw. The handle makes it easy for the staff to pick up and install.

[0026] Rectangular clamping plate 22: Two rectangular clamping plates 22 are fixedly connected to the lower surface of the L-shaped fixing plate 2 respectively. The lower ends of the two rectangular clamping plates 22 are engaged in the adjacent rectangular clamping slots 19. The engagement between the rectangular clamping plates 22 and the rectangular clamping slots 19 restricts the lateral displacement of the adjacent protective boxes and ensures the accurate position of the protective boxes when the screws are subsequently tightened.

[0027] Heating box 6: Heating box 6 is equipped with heating elements. Heating box 6 is filled with clean water or antifreeze coolant through water inlet pipe. Heating elements heat the liquid to 30-40℃ to provide a warm medium for the circulation system. Water outlet pipe 7 is used to transport hot water to the insulation pipe 16 of the first antifreeze protection box 9. Working principle of heating box 6: First, the circulating water, clean water or antifreeze coolant in the cooling tank 12, after being cooled, flows into the liquid receiving chamber of the heating tank through the delivery pipe 5 under the power of the delivery pump 11. After the liquid in the chamber reaches the preset level, it can be judged through the observation window of the tank or the liquid level sensor. Then, the water inlet valve is closed to complete the liquid preparation before heating. If the initial temperature is below 30℃, the minimum temperature required for antifreeze, the controller will automatically turn on the power to the heating element. After the heating element is powered on, it releases heat to directly heat the liquid in the chamber. As the liquid temperature gradually rises, when the sensor detects that the temperature has reached 40°C, the maximum temperature to avoid energy waste, the controller immediately cuts off the power to the heating element and stops heating. During the hot water output and circulation stage, when the liquid in the chamber is stable at 30-40℃, the switch valve of the water outlet pipe on the front side of the heating box is opened. Under the traction of the water pump 15 in the subsequent circulation system, the warm liquid flows into the connector 8 through the water outlet pipe 7 and finally enters the insulation pipe 16 of the first antifreeze protection box 9. At this time, the hot water will transfer heat to the irrigation pipe placement pipe 21 through the heat conduction of the insulation pipe 16, thereby heating the internal irrigation pipe and preventing the residual water in the pipe from freezing. After the liquid reflux and secondary heating complete the heating task, the temperature of the liquid drops to 15-20℃. It will flow along the closed loop path through the middle antifreeze protection box 3 and the insulation pipe 16 of the last antifreeze protection box 1. Finally, it will be pumped back to the cooling box 12 by the water pump 15 through the water outlet installation pipe 13 and the connecting pipe 14. After a short buffer in the cooling box, the delivery pump 11 will deliver the low temperature liquid back to the water inlet pipe of the heating box to enter the next round of heating, output and reflux cycle, so as to realize the reuse of water resources and continuous antifreeze. If the heating element experiences a current overload, the overload protector will immediately cut off the power. If the liquid in the chamber is insufficient due to leakage or other reasons, the anti-dry-burning sensor will trigger a power-off to prevent the heating element from burning out and being damaged. At the same time, the temperature control module will automatically adjust the start-stop frequency of the heating element according to changes in ambient temperature, such as the rapid cooling of the liquid at night, to ensure that the output water temperature remains stable within the effective antifreeze range of 30-40℃.

[0028] Water outlet pipe 7: Water outlet pipe 7 is fixedly connected to the front surface of heating box 6. Water outlet pipe 7 communicates with the interior of heating box 6. A switch valve is installed on water outlet pipe 7. The end of water outlet pipe 7 away from heating box 6 is fixedly connected to connector 8. Water outlet pipe 7 is used to transport hot water in heating box 6 to the insulation pipe 16 of the first antifreeze protection box 9. The switch valve controls the start and stop of hot water transportation and adjusts the heating rhythm in conjunction with the circulation system.

[0029] Cooling box 12: Cooling box 12 is located on the left side of the last antifreeze protection box 1. A water pump 15 is fixedly installed on the right side of cooling box 12. A delivery pump 11 is fixedly installed on the front surface of cooling box 12. Cooling box 12 is used to contain circulating water that has cooled down after absorbing heat, providing temporary storage space for water circulation and avoiding waste caused by direct discharge of circulating water.

[0030] Water pump 15: Water pump 15 is fixedly installed on the right side of cooling tank 12. The output end of water pump 15 is connected to the inside of cooling tank 12, and the input end of water pump 15 is fixedly connected to connecting pipe 14. Water pump 15 provides power for water circulation and pumps the warm water flowing out of the last antifreeze protection box 1 into cooling tank 12 to ensure smooth water flow in the circulation system.

[0031] Water outlet installation pipe 13: A connecting pipe 14 is fixedly connected to the rear end of the water outlet installation pipe 13. The water outlet installation pipe 13 is used to export the warm water from the insulation pipe 16 in the last antifreeze protection box 1, providing a channel for the warm water to flow to the cooling box 12.

[0032] Connecting pipe 14: Connecting pipe 14 is fixedly connected to the rear end of the water outlet installation pipe 13. The end of connecting pipe 14 away from the water outlet installation pipe 13 is fixedly connected to the input end of the water pump 15. Connecting pipe 14 connects the water outlet installation pipe 13 and the water pump 15 to ensure that the warm water flowing out of the antifreeze protection box 1 can smoothly enter the water pump 15 and then flow into the cooling box 12.

[0033] Transfer pump 11: The transfer pump 11 is fixedly installed on the front surface of the cooling box 12. The input end of the transfer pump 11 is connected to the inside of the cooling box 12, and the output end of the transfer pump 11 is fixedly connected to the transfer pipe 5. The transfer pump 11 can transfer the water in the cooling box 12 back to the heating box 6 to realize the closed loop of water circulation and reduce water consumption.

[0034] Delivery pipe 5: Delivery pipe 5 is fixedly connected to the output end of delivery pump 11. The end of delivery pipe 5 away from delivery pump 11 is fixedly connected to heating box 6. Delivery pipe 5 provides a channel for water in cooling box 12 to return to heating box 6, ensuring that circulating water can be reheated and participate in antifreeze, forming a continuous active heating mechanism.

[0035] Furthermore, when using the antifreeze protection device for agricultural irrigation pipelines, the last antifreeze protection box 1, the middle antifreeze protection box 3, and the first antifreeze protection box 9 are first assembled. First, the middle antifreeze protection box 3 and the first antifreeze protection box 9 are assembled together; When connecting the intermediate antifreeze protection box 3 with the first antifreeze protection box 9, first align the hot water delivery pipe 17 on the front side of the intermediate box with the insertion hole 20 of the insulation pipe 16 on the rear side of the first box, and slowly push it in so that the hot water delivery pipe 17 is fully inserted into the corresponding mounting hole of the insertion hole 20 and the first box, ensuring that the hot water can flow smoothly to the insulation pipe of the intermediate box. Then take out the L-shaped fixing plate 2 and snap the two rectangular clips 22 on its lower surface into the rectangular slots 19 adjacent to the rear side of the upper surface of the intermediate box and the front side of the upper surface of the first box. The cooperation between the rectangular clips and the slots achieves the initial positioning of the two protection boxes, avoiding lateral displacement during subsequent fixing. Then, the fixing screws are passed through the first mounting hole 10 of the L-shaped fixing plate 2 and the second mounting hole 18 of the adjacent rectangular plate 4 in sequence. Fixing nuts are screwed on both ends of the screws and tightened. Through the double fixing of snap-fit ​​positioning and screw reinforcement, the connection between the intermediate box and the first box is ensured to be firm, preventing outdoor wind or vibration from causing the connection to loosen. If the irrigation pipeline is long and multiple intermediate antifreeze protection boxes 3 need to be added, repeat the above assembly steps, insert the hot water delivery pipe 17 on the back of the new intermediate box into the insertion hole 20 of the insulation pipe on the front of the previous intermediate box, and then use the L-shaped fixing plate 2 to fix it with the fixing screw through the rectangular slot 19 until all intermediate boxes, the first box, and the last antifreeze protection box 1 form a continuous protection channel. This splicing design can flexibly increase or decrease the number of intermediate boxes according to the actual length of the irrigation pipeline, solve the problem that the traditional integrated antifreeze device cannot adapt to pipelines of different lengths, and adapt to the irrigation needs of different spans in the field. After all the protective boxes are assembled, the agricultural irrigation pipe is inserted into the irrigation pipe placement pipe 21 of the first antifreeze protective box 9, passes through the irrigation pipe placement pipe 21 of all the intermediate boxes in sequence, and finally exits from the irrigation pipe placement pipe 21 of the last antifreeze protective box 1. At this time, the insulation pipe 16 on the outer wall of the placement pipe tightly wraps the irrigation pipe. The heat exchange between the pipe and the cold air outside is reduced by the heat insulation material of the insulation pipe, thus achieving passive antifreeze and preventing the pipe from freezing directly due to low temperature. First, open the valve of the inlet pipe of the heating box 6 to inject clean water or antifreeze coolant into the heating box, close the inlet pipe valve, and start the heating element inside the heating box 6 to heat the water to 30-40℃. If the temperature is too high, it will waste energy, and if it is too low, the antifreeze effect will be insufficient. After the water temperature reaches the standard, open the valve of the outlet pipe 7 of the heating box, and at the same time start the water pump 15 on the right side of the cooling box 12 and the delivery pump 11 on the front side. The water pump 15 provides power for water circulation, so that the hot water in the heating box flows into the insulation pipe 16 of the first box through the outlet pipe 7, and then flows through the insulation pipes of all the intermediate boxes in sequence through the hot water delivery pipe 17, and finally flows into the connecting pipe 14 from the outlet installation pipe 13 of the last antifreeze protection box 1 and enters the cooling box 12. Among them, when hot water flows through each insulation pipe 16, it transfers heat to the irrigation pipe placement pipe 21 through heat conduction. The irrigation pipe placement pipe 21 conducts heat to the irrigation pipe to prevent residual water in the pipe from freezing and expanding, which could cause the pipe to break. After absorbing heat, the water with a temperature of 15-20℃ enters the cooling box 12. Among them, the start-up delivery pump 11 delivers the hot water back to the heating box 6 through the delivery pipe 5, realizing a closed-loop hot water circulation of heating, heat preservation, cooling and circulation. This not only avoids water waste, but also continuously provides stable heat to the pipeline, forming a dual antifreeze protection of passive heat preservation and active heating, solving the problem of traditional antifreeze failure in low-temperature environments that relies solely on the heat preservation layer. When protecting agricultural irrigation pipes from freezing, a dual antifreeze mechanism combining passive insulation and active heating is employed. The passive layer tightly wraps the irrigation pipe with insulation pipes, reducing heat exchange between the pipes and the cold outside air. The active layer utilizes a closed-loop hot water circulation system, transferring heat from 30-40℃ hot water through the insulation and placement pipes to the irrigation pipes, preventing residual water inside the pipes from freezing, expanding, and cracking. This solves the problem of traditional insulation layers failing to protect against freezing in low-temperature environments. Furthermore, the modular design allows for flexible adjustment of the number of antifreeze protection boxes in the middle sections based on the actual length of the irrigation pipe, adapting to irrigation needs across different spans in the field. This effectively addresses the issue of traditional integrated antifreeze devices being unable to accommodate pipes of varying lengths, flexibly addressing various field pipe layout scenarios.

[0036] Example 1: Replacing the original insulation pipe with a salt and alkali resistant composite insulation pipe 16 In a saline-alkali irrigation area in Northwest China, the soil has a high salt content, and the irrigation water contains saline-alkali components. The original ordinary insulation pipe 16 is easily corroded and aged, presenting significant problems: First, the saline-alkali water seeps in and corrodes the inner wall of the insulation pipe, causing the insulation layer to fall off and the thermal insulation performance to decline year by year; second, chloride ions in the saline-alkali soil accelerate the aging of the outer wall of the insulation pipe, reducing its service life to only 1-2 years and requiring frequent replacement; third, impurities generated by corrosion easily clog the hot water delivery pipe 17, affecting the smoothness of the circulation system. Therefore, the original insulation pipe 16 is replaced with a salt-alkali resistant composite insulation pipe, retaining the connection and water flow channel functions with the placement pipe. The inner layer is made of glass fiber reinforced polypropylene, the middle layer is extruded polystyrene insulation, and the outer layer is a composite polytetrafluoroethylene anti-corrosion film. Rubber sealing rings are added to both ends of the pipe. FRPP material is resistant to salt and alkali water corrosion, and the insulation layer does not peel off; the thermal insulation performance is stable over a long period of time, eliminating the need for frequent replacements due to insulation failure, and is suitable for long-term use in salt and alkali water corrosive environments, ensuring long-lasting antifreeze effect. The rubber sealing ring at the interface prevents saline water from seeping into the interlayer and generating impurities, ensuring that the hot water delivery pipe 17 is unblocked; the circulation system operates smoothly without the need for frequent disassembly and cleaning, making it suitable for irrigation environments with "high levels of saline and alkaline impurities" and ensuring the efficient operation of the antifreeze system.

[0037] Example 2: Replacing the original L-shaped fixing plate with a quick-release clamping plate 2 A greenhouse irrigation system requires monthly disassembly and reassembly of the antifreeze protection box for pipe maintenance. Each maintenance involves five sections of spliced ​​pipe, and the existing L-shaped fixing plate 2 presents several problems: First, bolt fixing and disassembly are time-consuming, requiring four bolts to be tightened at each joint, taking 15 minutes per section, resulting in a total maintenance time exceeding one hour for all five sections. Second, soil from the field easily enters the bolt holes, causing bolt corrosion and jamming, necessitating tools to remove the bolts and damaging the fixing plate. Third, uneven bolt tightening by hand can lead to unbalanced stress at the joints of the protection box, resulting in gaps and air leakage, affecting insulation performance. Therefore, the existing L-shaped fixing plate 2 is replaced with a quick-release clamping plate. The plate retains the snap-fit ​​structure of the rectangular clamping plate 22 and the rectangular clamping groove 19, with two elastic buckles on the upper surface made of spring steel, opening at a 60° angle. Buckle slots are provided on the corresponding rectangular plate 4. The first mounting hole 10 and the fixing screw structure are removed, while a handle is retained for easy operation. The flexible buckle and buckle slot can be quickly engaged / disengaged without tools. The disassembly and assembly time of a single section splice is reduced to 2 minutes, and the total maintenance time of 5 sections of pipeline is reduced to 10 minutes, which greatly improves the efficiency of field maintenance and meets the needs of high-frequency pipeline maintenance in greenhouses.

[0038] By eliminating the bolt hole design, there is no soil accumulation and pollution, and the elastic buckle is free from rust and jamming. The service life of the components is extended from the original 6 months to 2 years, reducing the cost of replacing the fixing plate and making it suitable for harsh environments with high dust and humidity in the field. The elastic buckle automatically compensates for the clamping force, ensuring a tight and seamless fit at the joints of the protective box, reducing the air leakage rate to zero, and providing stable insulation. There is no need to readjust the splicing gaps, ensuring the reliability of the irrigation pipe's antifreeze function and adapting to the precise temperature control requirements of greenhouses.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A frost protection device for agricultural irrigation pipelines, comprising a final frost protection box (1), an intermediate frost protection box (3), a head frost protection box (9), and an L-shaped fixing plate (2), characterized in that: The last antifreeze protection box (1), the middle antifreeze protection box (3), and the first antifreeze protection box (9) are arranged in a front-to-back correspondence, with the middle antifreeze protection box (3) located on the opposite side of the last antifreeze protection box (1) and the first antifreeze protection box (9). Among them, the last antifreeze protection box (1), the middle antifreeze protection box (3) and the first antifreeze protection box (9) are all fixedly installed with irrigation pipe placement pipes (21), and the outer walls of the three irrigation pipe placement pipes (21) are all fixedly fitted with heat insulation pipes (16). Among them, the front surfaces of the middle antifreeze protection box (3) and the last antifreeze protection box (1) are provided with two mounting holes that communicate with their interiors; Among them, the front surface of the heat insulation pipe (16) inside the last antifreeze protection box (1) and the middle antifreeze protection box (3) is provided with a socket (20) that communicates with its interior, and the socket (20) corresponds to the mounting hole.

2. The antifreeze protection device for agricultural irrigation pipelines according to claim 1, characterized in that: The rear surface of the internal insulation pipe (16) of the middle antifreeze protection box (3) and the last antifreeze protection box (1) is fixedly connected to a hot water delivery pipe (17) that communicates with its interior. Among them, four hot water delivery pipes (17) are respectively inserted into the inner walls of the corresponding mounting holes and insertion holes (20).

3. The antifreeze protection device for agricultural irrigation pipelines according to claim 1, characterized in that: A water outlet pipe (13) that communicates with the interior is fixedly connected to the lower surface of the heat insulation pipe (16) inside the last antifreeze protection box (1). Among them, the rear end of the water outlet installation pipe (13) extends through the rear surface of the final antifreeze protection box (1), and the rear end of the water outlet installation pipe (13) is fixedly connected to a connecting pipe (14) that communicates with its interior.

4. The antifreeze protection device for agricultural irrigation pipelines according to claim 1, characterized in that: The upper surface of the antifreeze protection box (3) in the middle position has two rectangular slots (19) on the front and back sides, respectively. Among them, the front side of the upper surface of the last antifreeze protection box (1) has two rectangular slots (19) with the same left and right corresponding to each other. Among them, two rectangular slots (19) with the same left and right corresponding arrangement are opened on the rear side of the upper surface of the first antifreeze protection box (9).

5. The antifreeze protection device for agricultural irrigation pipelines according to claim 1, characterized in that: Two rectangular plates (4) are fixedly connected to both the left and right sides of the antifreeze protection box (3) in the middle position. Among them, the left and right sides of the last antifreeze protection box (1) are fixedly connected with two identical rectangular plates (4). Among them, the first antifreeze protection box (9) has two identical rectangular plates (4) fixedly connected to both the left and right sides. Among them, multiple rectangular plates (4) are provided with second mounting holes (18); Among them, there are multiple intermediate position antifreeze protection boxes (3), and the structures on multiple intermediate position antifreeze protection boxes (3) are completely identical.

6. The antifreeze protection device for agricultural irrigation pipelines according to claim 1, characterized in that: The upper surface of the first antifreeze protection box (9) is fixedly connected to a heating box (6), and the rear surface of the heating box (6) is fixedly connected to a water inlet pipe that is the same as the one inside it. Among them, the front surface of the heating box (6) is fixedly connected to the same water outlet pipe (7) as the inside, and the water outlet pipe (7) is fixedly connected to the connector (8); Both the inlet pipe and the outlet pipe (7) are equipped with switch valves.

7. The antifreeze protection device for agricultural irrigation pipelines according to claim 1, characterized in that: A cooling box (12) is provided on the left side of the last antifreeze protection box (1), and a water pump (15) is fixedly installed on the right side of the cooling box (12). The output end of the water pump (15) is connected to the interior of the cooling box (12). The connecting pipe (14) is fixedly connected to the input end of the water pump (15); Among them, a delivery pump (11) is fixedly installed on the front surface of the cooling box (12). The input end of the delivery pump (11) is connected to the interior of the cooling box (12). The output end of the delivery pump (11) is fixedly connected to a delivery pipe (5). The delivery pipe (5) is fixedly connected to the heating box (6).

8. The antifreeze protection device for agricultural irrigation pipelines according to claim 1, characterized in that: The L-shaped fixing plate (2) has a first mounting hole (10), and a handle is fixedly connected to the left side of the L-shaped fixing plate (2); Among them, two rectangular clips (22) are fixedly connected to the lower surface of the L-shaped fixing plate (2), and the lower ends of the two rectangular clips (22) are inserted into the adjacent rectangular clip slots (19); Among them, there are multiple L-shaped fixing plates (2), and the structures on the multiple L-shaped fixing plates (2) are completely identical; The second mounting hole (18) is connected in series with the two adjacent first mounting holes (10) by a fixing screw, and a fixing nut is provided on the fixing screw.

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