Low temperature intelligent control device for bulk grain storage

Abstract

This invention relates to a low-temperature intelligent control device for bulk grain storage, comprising a cold water tank, multiple sets of cold water pipes buried in the walls and ground of the grain silo, and a controller. It also includes a cold water circulation system, a heat exchange circulation system, and a refrigeration circulation system. The cold water circulation system includes cold water circulation pipelines and a manifold, with multiple independently controllable opening and closing devices on the manifold. The heat exchange circulation system includes heat exchange circulation pipelines and a plate heat exchanger, allowing water from the cold water tank to circulate and exchange heat with the plate heat exchanger. The refrigeration circulation system includes a refrigerant circulation pipe connected to a refrigeration component that drives the refrigerant phase change and thermodynamic cycle. This invention achieves intelligent and efficient cooling of the bulk grain silo interior through the coordinated operation of the cold water circulation system, the heat exchange circulation system, and the refrigeration circulation system, ensuring a uniform and stable low-temperature environment in all areas.

Description

Technical Field

[0001] This invention relates to the technical field of bulk grain storage, and in particular to a low-temperature intelligent control device for bulk grain storage. Background Technology

[0002] In the process of storing bulk grain, the main method is to store bulk grain in bulk silos. To prevent mold and pests from occurring during storage, the internal temperature of the bulk grain silos is usually controlled at a low level.

[0003] Existing bulk grain silos typically use air conditioning to maintain a low-temperature environment. By connecting air conditioners and air ducts, a cold air circulation is formed inside the bulk grain silo, thereby maintaining a uniform temperature of the grain pile.

[0004] However, because large quantities of bulk grain are piled up in the bulk grain warehouse, the flow of cold air is affected. As a result, the cold air can only lower the temperature above the grain surface and cannot solve the temperature problem around and at the bottom of the grain pile. When the sun shines on the warehouse wall, the temperature of the warehouse wall will rise rapidly, and the bulk grain pile will have a problem of low temperature inside the grain pile and high temperature near the warehouse wall. This makes it impossible for the temperature of the bulk grain pile to be evenly distributed, and the grain near the warehouse wall is easily affected by the high temperature and deteriorates. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a low-temperature intelligent control device for bulk grain storage.

[0006] A low-temperature intelligent control device for bulk grain storage includes a cold water tank and multiple sets of cold water pipes buried in the walls and ground of the bulk grain silo. It also includes a cold water circulation system, which connects the cold water tank and the cold water pipes to provide cold water circulation. The cold water circulation system includes a cold water circulation pipeline and a manifold, which is connected between the cold water circulation pipeline and the multiple sets of cold water pipes. The manifold is equipped with multiple independent opening and closing components for controlling the on / off of the cold water pipes. A heat exchange circulation system, comprising a heat exchange circulation pipeline and a plate heat exchanger, wherein the heat exchange circulation pipeline connects the cold water storage tank and the plate heat exchanger to circulate the water entering and leaving the cold water storage tank to the plate heat exchanger. A refrigeration cycle system, comprising a refrigerant circulation pipe, the two ends of which are connected to the plate heat exchanger for refrigerant circulation, and a refrigeration component connected to the refrigerant circulation pipe for cooling the water flowing through the plate heat exchanger. The water in the cold storage tank circulates through the heat exchange circulation pipeline to the plate heat exchanger and exchanges heat with the refrigeration circulation system for cooling.

[0007] By adopting the above technical solutions, the coordinated operation of the cold water circulation system, heat exchange circulation system, and refrigeration circulation system enables intelligent and efficient cooling of the interior of the bulk grain warehouse, ensuring a uniform and stable low-temperature environment in each area.

[0008] The present invention is further configured such that: the cold water pipe includes a ground branch pipe and a silo wall branch pipe, the ground branch pipe and the silo wall branch pipe are independently connected to the water distribution manifold, and the layout density of the silo wall branch pipe is greater than the layout density of the ground branch pipe.

[0009] By adopting the above technical solution, the density of the branch pipes in the warehouse wall is greater than that of the branch pipes on the ground, which can more effectively cool the warehouse wall of bulk grain, reduce the impact of solar radiation on the temperature rise of the bulk grain warehouse, and ensure the uniform and stable low temperature environment around the bulk grain pile.

[0010] The present invention is further configured such that: the low-temperature intelligent control device also includes a controller for performing low-temperature intelligent control; each group of cold water pipes is provided with a temperature sensing element for detecting the temperature of the bulk grain silo wall or the ground; the controller controls the opening and closing of the opening and closing element according to the temperature signal of the temperature sensing element to make the corresponding cold water pipe open or closed.

[0011] By adopting the above technical solution, the temperature sensing components form a three-dimensional distributed temperature measurement network, which can accurately monitor the temperature of the bulk grain warehouse walls and the ground, and facilitate the control of the corresponding area's cold water pipes for precise cooling, reducing ineffective energy consumption.

[0012] The invention is further configured such that: the water in the cold storage tank is vertically layered into a high-temperature zone, a medium-temperature zone, and a low-temperature zone; the high-temperature zone of the cold storage tank is provided with a circulation inlet and a heat exchange outlet; the low-temperature zone of the cold storage tank is provided with a circulation outlet and a heat exchange inlet; the circulation inlet and the circulation outlet are respectively connected to both ends of a cold water circulation pipeline; the heat exchange outlet and the heat exchange inlet are respectively connected to both ends of a heat exchange circulation pipeline; and the ends of the circulation inlet and the heat exchange inlet are each provided with a water distribution ring for uniformly supplying water into the cold storage tank.

[0013] By adopting the above technical solution, when the water in the cold water storage tank circulates in the cold water circulation system and the heat exchange circulation system, the water of different temperatures is stabilized in layers in the cold water storage tank, which can avoid excessive local temperature difference and improve the overall cooling efficiency. At the same time, the water distribution ring can make the hot or cold water flowing into the cold water storage tank more evenly distributed.

[0014] The present invention is further configured such that: the side wall of the cold water storage tank is a double-layer vacuum structure, and the side wall of the cold water storage tank is provided with a heat insulation interlayer.

[0015] By adopting the above technical solution, the double-layer vacuum sidewall and the insulation interlayer can further improve the insulation effect of the cold water tank. In winter, the water can be heated by the heating element, which can effectively prevent the cold water pipe from freezing and cracking, thus affecting the storage of bulk grain.

[0016] The present invention is further configured such that: the cold water circulation pipeline includes a cold water supply pipe, a cold water return pipe and a circulation branch pipe, a first circulation pump for driving cold water circulation is installed on the cold water supply pipe, the circulation branch pipe is connected between the cold water supply pipe and the cold water return pipe, and a three-way regulating valve is installed at the connection between the cold water return pipe and the circulation branch pipe.

[0017] By adopting the above technical solution, the first circulation pump drives the cold water circulation, realizing the effective circulation of cold water in the system. Under the regulation of the three-way regulating valve, part of the return water in the cold water return pipe is mixed with the cold water in the cold water storage tank, which can reduce the consumption of cold water in the cold water storage tank.

[0018] The present invention is further configured such that: the outlet end of the first circulating pump is equipped with a first temperature sensor for monitoring the cold water supply temperature T1; the inlet end of the three-way regulating valve is equipped with a second temperature sensor for monitoring the cold water return temperature T2; and the interior of the cold water storage tank is equipped with a third temperature sensor for monitoring the water temperature T3 inside the cold water storage tank. When T3≥T2, the three-way regulating valve is closed so that cold water flows only through the circulating branch pipe to the cold water supply pipe. When T3<T2, the three-way regulating valve adjusts its opening according to the cold water supply temperature T1 to regulate the amount of water flowing through the cold water storage tank.

[0019] By adopting the above technical solution, the cold water supply temperature T1, the cold water return temperature T2, and the water temperature in the cold water storage tank T3 are monitored. The controller makes precise control of the three-way regulating valve according to the temperature signal, realizes intelligent optimization of the cold water circulation path, and reduces cold water consumption while continuously creating a low-temperature environment for the bulk grain silo.

[0020] The present invention is further configured such that: a differential pressure bypass valve for adjusting the pressure difference between the cold water supply pipe and the cold water return pipe is provided, and an expansion tank for adjusting the supply pressure is provided on the cold water supply pipe.

[0021] By adopting the above technical solution, the differential pressure bypass valve and the expansion tank work together to regulate the water supply pressure in the cold water circulation system, ensuring uniform and stable water pressure in the cold water pipes and extending the service life of the cold water pipes.

[0022] The present invention is further configured such that: the heat exchange circulation pipeline includes a heat exchange outlet pipe and a heat exchange inlet pipe, the heat exchange outlet pipe is provided with a second circulation pump that drives the hot water to be exchanged to circulate to the plate heat exchanger, and the heat exchange inlet pipe is provided with a flow switch for monitoring the water flow status during the heat exchange circulation process.

[0023] By adopting the above technical solution, the second circulation pump and the flow switch work together to facilitate the regulation of the water flow velocity in the heat exchange circulation system, thereby improving the heat exchange effect of the water at the plate heat exchanger.

[0024] The present invention is further configured such that: the refrigeration assembly includes a compressor, a finned heat exchanger, and an electronic expansion valve; the compressor, the finned heat exchanger, and the electronic expansion valve are connected in series via the refrigerant circulation pipe; the outlet end of the plate heat exchanger is provided with a low-pressure sensor for detecting the pressure of the refrigerant after evaporation; the outlet end of the compressor is provided with a high-pressure sensor for detecting the pressure of the refrigerant after compression; and the controller receives the pressure signals from the low-pressure sensor and the high-pressure sensor to control the operation of the compressor.

[0025] By adopting the above technical solution, the refrigeration cycle system and the heat exchange cycle system work together to continuously exchange heat and store water in the cold water tank.

[0026] In summary, the beneficial technical effects of the present invention are as follows: By coordinating the cold water circulation system, heat exchange circulation system, and refrigeration circulation system, cold water can circulate in the cold water pipes, forming a three-dimensional cooling system on the outside of the bulk grain pile. This system can also precisely cool the walls and ground of the bulk grain silo, effectively isolating the external temperature from the inside of the bulk grain silo. This ensures that all areas of the bulk grain pile have a uniform and stable low-temperature environment, thereby improving the storage effect of the bulk grain. By setting up multiple sets of sensors to monitor the cold water supply temperature T1, the cold water return temperature T2, and the water temperature T3 in the cold water storage tank, the controller can precisely regulate the three-way regulating valve according to the temperature signal, realize intelligent optimization of the cold water circulation path, and reduce cold water consumption while continuously creating a low-temperature environment for the bulk grain silo.

[0027] By coordinating the heat exchange circulation system and the refrigeration circulation system, the water in the cold water storage tank 1 is cooled by heat exchange and the cold water is stored. This reduces the pressure on the cold water supply during high-temperature periods. While efficiently maintaining the low-temperature environment of the bulk grain warehouse, it further optimizes the overall cooling efficiency of the bulk grain warehouse and reduces energy consumption. Attached Figure Description

[0028] Figure 1 This is the system control diagram of this application.

[0029] Figure 2 This is the system control diagram of the cold water circulation system in this application.

[0030] Figure 3 This is the system control diagram of the heat exchange cycle system in this application.

[0031] Figure 4 This is the system control diagram of the refrigeration cycle system in this application.

[0032] Figure 5 This is one of the structural schematic diagrams of the cold water storage tank in this application.

[0033] Figure 6 This is the second schematic diagram of the cold water storage tank in this application.

[0034] Figure 7 This is a schematic diagram of the cold water pipe laying in this application.

[0035] In the diagram: 1. Cold water storage tank; 101. High temperature zone; 102. Medium temperature zone; 103. Low temperature zone; 11. Circulation inlet; 12. Heat exchange outlet; 13. Circulation outlet; 14. Heat exchange inlet; 15. Water distribution ring; 16. Water supply outlet; 17. Sewage outlet; 18. Air vent; 2. Cold water pipe; 21. Ground branch pipe; 22. Silo wall branch pipe; 23. Temperature sensor; 3. Cold water circulation system; 31. Cold water circulation pipeline; 311. Cold water supply pipe; 312. Cold water return pipe; 313. Circulation branch pipe; 32. Manifold; 321. Distribution end; 322. Collection... 33. Water end; 34. Opening and closing components; 35. First circulation pump; 36. Three-way regulating valve; 37. Differential pressure bypass valve; 4. Expansion tank; 4. Heat exchange circulation system; 41. Heat exchange circulation pipeline; 411. Heat exchange outlet pipe; 412. Heat exchange inlet pipe; 42. Plate heat exchanger; 43. Second circulation pump; 44. Flow switch; 5. Refrigeration circulation system; 51. Refrigerant circulation pipe; 52. Compressor; 53. Finned heat exchanger; 54. Electronic expansion valve; 55. Low-pressure sensor; 56. High-pressure sensor; 57. Gas-liquid separator; 58. Filter; 6. Insulation jacket; 61. Heating element. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Reference Figures 1-7 The present invention discloses a low-temperature intelligent control device for bulk grain storage, comprising a cold water tank 1, multiple sets of cold water pipes 2 buried in the walls and ground of the bulk grain warehouse, a cold water circulation system 3, a heat exchange circulation system 4, a refrigeration circulation system 5, and a controller for low-temperature intelligent control.

[0038] The cold water circulation system 3 includes a cold water circulation pipeline 31 and a manifold 32. The cold water circulation pipeline 31 connects the cold water storage tank 1 and the cold water pipe 2 to provide cold water circulation. The manifold 32 is connected between the cold water circulation pipeline 31 and multiple sets of cold water pipes 2. The manifold 32 is equipped with multiple independent opening and closing components 33 that control the opening and closing of the cold water pipes 2. The opening and closing components 33 can adopt a valve structure, a solenoid valve structure, or an electric heating valve structure. In this embodiment, the opening and closing components 33 adopt a straight-through electric heating valve structure. Each set of cold water pipes 2 can be independently connected to the manifold 32 through the opening and closing components 33. The controller controls the opening and closing of the opening and closing components 33 to dynamically adjust the opening and closing status of the cold water pipes 2 at different positions, thereby independently controlling the water volume and flow status in each set of cold water pipes 2, so as to accurately cool down according to the temperature distribution in the bulk grain silo and reduce ineffective energy consumption.

[0039] The heat exchange circulation system 4 includes a heat exchange circulation pipeline 41 and a plate heat exchanger 42. The heat exchange circulation pipeline 41 connects the cold water storage tank 1 and the plate heat exchanger 42 so that the water entering and leaving the cold water storage tank 1 circulates to the plate heat exchanger 42.

[0040] The refrigeration cycle system 5 includes a refrigerant circulation pipe 51, with both ends of the refrigerant circulation pipe 51 connected to a plate heat exchanger 42 for refrigerant circulation. A refrigeration component is connected to the refrigerant circulation pipe 51 to cool the water flowing through the plate heat exchanger 42. The water in the cold water storage tank 1 circulates from the heat exchange circulation pipe 41 to the plate heat exchanger 42 and exchanges heat with the refrigeration cycle system 5 for cooling. The refrigerant in different phase change states is controlled by the refrigeration component to circulate in the refrigerant circulation pipe 51 and exchange heat with the refrigerant in the plate heat exchanger 42, thereby rapidly cooling the water.

[0041] In the process of low-temperature storage of bulk grain, this application is used in conjunction with a traditional bulk grain silo air conditioning system. The air conditioning system is installed on the top of the bulk grain silo and can cool the area above the grain surface after cooling. The cold water pipe 2 is buried in the silo wall and ground of the bulk grain silo and can cool the area around and bottom of the bulk grain pile, thereby forming a three-dimensional low-temperature barrier on the outside of the bulk grain pile to ensure that the bulk grain pile has a uniform and stable low-temperature environment.

[0042] Reference Figures 1-4 Through the coordinated operation of the cold water circulation system 3, the heat exchange circulation system 4, and the refrigeration circulation system 5, low-temperature cold water can circulate in the cold water pipe 2 and cool the bulk grain pile around and at the bottom, thus forming a three-dimensional cooling system on the outside of the bulk grain pile. This isolates the external temperature from the inside of the bulk grain silo, ensuring that all areas inside the bulk grain silo have a uniform and stable low-temperature environment, thereby improving the low-temperature storage effect of the bulk grain.

[0043] By cooperating with the cold water circulation system 3 and the heat exchange circulation system 4, a dual closed-loop control of cold water can be formed, thereby continuously and efficiently circulating low-temperature water into the cold water pipe 2 to improve the cooling effect inside the bulk grain silo. By cooperating with the heat exchange circulation system 4 and the refrigeration circulation system 5, the heated water in the cold water storage tank 1 can be rapidly exchanged, achieving a significant reduction in water temperature in a short time. With the coordinated operation of the cold water storage tank 1, cold water pipe 2, cold water circulation system 3, heat exchange circulation system 4, and refrigeration circulation system 5, the production, storage, and distribution of cold water can be designed in a closed loop, facilitating intelligent and efficient cooling of the bulk grain silo.

[0044] Reference Figure 2 , Figure 5 and Figure 6 The water temperature inside the cold water storage tank 1 exhibits vertical stratification. The tank contains a high-temperature zone 101, a medium-temperature zone 102, and a low-temperature zone 103, corresponding to the respective temperature zones. The high-temperature zone 101 of the cold water storage tank 1 has an integrally formed circulation inlet 11 and a heat exchange outlet 12. The low-temperature zone 103 of the cold water storage tank 1 has an integrally formed circulation outlet 13 and a heat exchange inlet 14. The circulation inlet 11 and circulation outlet 13 are connected to both ends of the cold water circulation pipeline 31 to allow cold water to flow into the cold water pipe 2. The heat exchange outlet 12 and heat exchange inlet 14 are connected to both ends of the heat exchange circulation pipeline 41. To supply hot water for heat exchange and cooling, the ends of the circulation inlet 11 and the heat exchange inlet 14 are both fixed with a water distribution ring 15 that evenly supplies water into the cold water storage tank 1. The water distribution ring 15 has evenly distributed micropores to allow water to evenly enter the interior of the cold water storage tank 1. The water distribution ring 15 connected to the circulation inlet 11 allows the hot water returning from the cold water circulation system 3 to evenly enter the high temperature zone 101. The water distribution ring 15 connected to the heat exchange inlet 14 allows the low temperature water cooled by the heat exchange circulation system 4 to evenly enter the low temperature zone 103, thereby ensuring a uniform water temperature distribution inside the cold water storage tank 1, avoiding excessive local temperature differences, and improving the overall cooling efficiency.

[0045] In the specific implementation process, the vertical height of the heat exchange outlet 12 on the cold storage water tank 1 is higher than that of the circulation inlet 11, and the vertical height of the heat exchange inlet 14 on the cold storage water tank 1 is lower than that of the circulation outlet 13. The water in the high temperature zone 101 of the cold storage water tank 1 can be transported to the heat exchange circulation system 4 through the heat exchange outlet 12. After being cooled by the plate heat exchanger 42, the water with the lowest temperature flows evenly into the low temperature zone 103 of the cold storage water tank 1 through the water distribution ring 15 at the end of the heat exchange inlet 14 for cold storage. When cooling the bulk grain silo, the water in the low temperature zone 103 of the cold storage water tank 1 is transported to the cold water pipe 2 through the circulation outlet 13. After the water becomes hot, it flows back to the interior of the cold storage water tank 1 through the water distribution ring 15 at the end of the circulation inlet 11, ensuring precise control of the water temperature in each area and further improving the cooling effect.

[0046] In further implementation, a water inlet 16 is provided at the top of the cold water storage tank 1. The water inlet 16 is sealed by a threaded head. When the water in the cold water storage tank 1 is insufficient, the threaded head can be removed and water can be added to the cold water storage tank 1 through the water inlet 16. In addition, an air vent valve 18 is also installed at the top of the cold water storage tank 1 to quickly expel residual air in the tank and maintain the air pressure balance inside and outside the tank. A drain outlet 17 is provided at the bottom of the cold water storage tank 1. The drain outlet 17 is sealed by a threaded head to facilitate the periodic drainage of the cold water storage tank 1.

[0047] Reference Figure 6 To improve the insulation effect of the cold water storage tank 1, the side wall of the cold water storage tank 1 has a double-layer vacuum structure, and an insulation layer 6 is set in the side wall of the cold water storage tank 1. The insulation layer 6 is filled with high-efficiency heat insulation material, such as polyurethane foam, glass wool or other heat insulation materials, which can isolate the heat exchange between the inside and outside of the cold water storage tank 1 to keep the cold water warm. In addition, considering that the cold water pipe 2 needs to be protected from freezing in winter to prevent the cold water pipe 2 from cracking due to water freezing, a heating element 61 is installed in the insulation layer 6 of the cold water storage tank 1. The heating element 61 is a ring electric heating belt that can fit against the side wall of the cold water storage tank 1 and heat the water in the cold water storage tank 1. The water is circulated to the cold water pipe 2 through the cold water circulation system 3 to ensure that the water temperature in the cold water pipe 2 is always kept above zero degrees, preventing freezing and avoiding the impact of the cold water pipe 2 cracking due to freezing on the storage of bulk grain.

[0048] Reference Figure 1 , Figure 2 and Figure 7 The cold water pipe 2 includes a ground branch pipe 21 installed in the ground and a warehouse wall branch pipe 22 installed in the warehouse wall. Both the ground branch pipe 21 and the warehouse wall branch pipe 22 have multiple sets, and each set of branch pipes is independently connected to the water distribution manifold 32. The on / off of each set of ground branch pipe 21 or warehouse wall branch pipe 22 can be controlled individually by the opening and closing device 33 installed on the water distribution manifold 32, so as to facilitate precise cooling of different areas of the bulk grain warehouse.

[0049] Both the ground branch pipe 21 and the silo wall branch pipe 22 are made of high thermal conductivity materials, specifically aluminum-plastic composite pipe, copper-aluminum composite pipe, cross-linked polyethylene pipe, polybutene pipe or nano-carbon reinforced plastic pipe, to ensure that the cold water pipe 2 can quickly exchange heat inside the bulk grain silo.

[0050] In the specific implementation process, considering that the walls of the bulk grain silo are easily heated by sunlight, the density of the branch pipes 22 on the silo walls is greater than that of the ground branch pipes 21, so as to improve the cooling efficiency of the bulk grain silo walls, reduce the impact of sunlight on the heating of the bulk grain silo, and ensure that there is a uniform and stable low temperature environment around the bulk grain pile.

[0051] In further implementation, due to the different positions of the sun's rays on the bulk grain silo at different times, the temperature of the silo walls in the directly sunlit areas will rise rapidly, while the temperature change of the silo walls in other areas not directly exposed to the sun will be smaller. This will lead to uneven temperature distribution inside the bulk grain silo. In order to improve the cooling effect of the cold water pipe 2 on different areas and ensure uniform temperature distribution inside the bulk grain silo, temperature sensing elements 23 are embedded in both the silo walls and the ground. In this embodiment, the temperature sensing elements 23 are temperature sensing cables, which are distributed adjacent to the cold water pipe 2 to form a three-dimensional distributed temperature sensing network to monitor the temperature of the silo walls and the ground. The temperature signal is transmitted to the controller, which can then control the opening and closing of the opening and closing parts 33 on the water distribution manifold 32 according to the temperature distribution inside the bulk grain silo to open and close the corresponding cold water pipe 2. This establishes a three-dimensional cooling system for the bulk grain silo, achieves precise cooling of the heated areas, reduces ineffective energy consumption, and ensures that all areas of the bulk grain silo have a uniform and stable low-temperature environment, effectively preventing grain deterioration.

[0052] In the further implementation process, partitions are fixedly installed on the walls and ground of the bulk grain silo by bolts. The partitions are set on the outside of the cold water pipe 2. Phenolic foam sandwich panels, polyurethane sandwich panels or rock wool sandwich panels can be used to improve the uniformity of temperature change on the outside of the cold water pipe 2 and prevent condensation from occurring on the walls of the bulk grain silo due to sudden low temperature.

[0053] Reference Figure 1 and Figure 2 The cold water circulation pipeline 31 includes a cold water supply pipe 311, a cold water return pipe 312, and a circulation branch pipe 313. The manifold 32 includes a distribution end 321 that independently supplies water to multiple cold water pipes 2 and a collection end 322 that collects the return water from the cold water pipes 2. The cold water supply pipe 311 is connected between the circulation outlet 13 of the cold water storage tank 1 and the distribution end 321. The cold water return pipe 312 is connected between the circulation inlet 11 of the cold water storage tank 1 and the collection end 322. A first circulation pump 34 that drives the cold water circulation is installed on the cold water supply pipe 311. The circulation branch pipe 313 is connected between the cold water supply pipe 311 and the cold water return pipe 312. A three-way regulating valve 35 is installed at the connection with the circulating branch pipe 313. The three-way regulating valve 35 is a three-way ratio regulating valve, which can regulate the water flow from the cold water return pipe 312 to the cold water storage tank 1 and the cold water supply pipe 311. When the three-way regulating valve 35 is closed, the water in the cold water return pipe 312 does not flow through the cold water storage tank 1, but flows directly to the cold water supply pipe 311 through the circulating branch pipe 313. When the three-way regulating valve 35 is opened to the maximum, the water in the cold water return pipe 312 does not flow through the circulating branch pipe 313, but flows completely into the top of the cold water storage tank 1, and the cold water at the bottom of the cold water storage tank 1 flows into the cold water supply pipe 311 for water supply.

[0054] The outlet of the first circulating pump 34 is equipped with a first temperature sensor to monitor the cold water supply temperature T1, the inlet of the three-way regulating valve 35 is equipped with a second temperature sensor to monitor the cold water return temperature T2, and the interior of the cold water storage tank 1 is equipped with a third temperature sensor to monitor the water temperature T3 inside the cold water storage tank 1.

[0055] When T3≥T2, the controller controls the three-way regulating valve 35 to close so that the cold water flows only through the circulating branch pipe 313 to the cold water supply pipe 311, and does not flow through the cold water storage tank 1, so that the cold water circulates in the cold water supply pipe 311, the cold water pipe 2, the cold water return pipe 312 and the circulating branch pipe 313.

[0056] When T3 < T2, the controller adjusts the opening of the three-way regulating valve 35 according to the cold water supply temperature T1 to regulate the amount of water flowing through the cold water storage tank 1. If T1 is within the target temperature range, a portion of the water flows through the circulation branch pipe 313 and another portion flows through the cold water storage tank 1. This ensures that the water in the cold water supply pipe 311 has the set water temperature while reducing the amount of cold water consumed in the cold water storage tank 1. If T1 is too much higher than the target temperature, the opening of the three-way regulating valve 35 is adjusted to the maximum so that the hot water returning to the cold water return pipe 312 flows completely into the cold water storage tank 1 without flowing through the circulation branch pipe 313, and the cold water stored in the cold water storage tank 1 is transported to the cold water pipe 2 through the cold water supply pipe 311, thereby rapidly cooling the interior of the bulk grain silo.

[0057] During the cooling process of the bulk grain silo, in order to prevent condensation from occurring in the cold water pipe 2 due to the large temperature difference between the silo's internal temperature and the water temperature, the cold water supply temperature T1 can be gradually reduced based on the temperature of the bulk grain silo monitored by the temperature sensor 23. This allows the water temperature in the cold water pipe 2 to drop evenly, thereby keeping the temperature difference between the water in the cold water pipe 2 and the interior of the bulk grain silo within a small range while cooling the silo, effectively preventing condensation from occurring on the surface of the cold water pipe 2.

[0058] In further implementation, considering that the cold water pipe 2 needs to be protected from freezing during winter use to prevent it from cracking due to water freezing, the controller controls the operation of the first circulation pump 34 and the heating element 61 by monitoring the temperature values ​​T1, T2 and T3. The heating element 61 can heat the water in the cold water storage tank 1 to ensure that the water temperature T3 in the cold water storage tank 1 is above zero degrees. The three-way regulating valve 35 controls the mixing of the water in the cold water return pipe 312 with the water in the cold water storage tank 1. During the water circulation process, the water temperature T1 in the cold water supply pipe 311 and the water temperature T2 in the cold water return pipe 312 are both above zero degrees, thereby ensuring that the water temperature in the cold water pipe 2 is above zero degrees and preventing the inside of the cold water pipe 2 from freezing.

[0059] Reference Figure 2A differential pressure bypass valve 36 is provided between the cold water supply pipe 311 and the cold water return pipe 312 and near the manifold 32. One end of the differential pressure bypass valve 36 is fixedly connected to and communicates with the cold water supply pipe 311, and the other end of the differential pressure bypass valve 36 is fixedly connected to and communicates with the cold water return pipe 312. The differential pressure difference between the supply and return water can be adjusted through the differential pressure bypass valve 36. When the supply and return water pressure difference is too high, the differential pressure bypass valve 36 opens to bypass part of the flow to reduce the pressure difference.

[0060] An expansion tank 37 is installed on the cold water supply pipe 311 near the outlet of the first circulation pump 34. When the water supply pressure is high, some water flows into the expansion tank 37 for buffering to reduce the water supply pressure. When the water supply pressure is low, the water in the expansion tank 37 flows into the cold water supply pipe 311 to increase the water supply pressure, thereby playing a good role in stabilizing the pressure. Through the differential pressure bypass valve 36 and the expansion tank 37, it is ensured that the cold water supply pipe 311 can supply water to the cold water pipe 2 with a stable water pressure, thus extending the service life of the cold water pipe 2.

[0061] Reference Figure 1 and Figure 3 The heat exchange circulation pipeline 41 includes a heat exchange outlet pipe 411 and a heat exchange inlet pipe 412. The heat exchange outlet pipe 411 is connected between the heat exchange outlet 12 of the cold storage water tank 1 and the plate heat exchanger 42. The heat exchange inlet pipe 412 is connected between the heat exchange inlet 14 of the cold storage water tank 1 and the plate heat exchanger 42. A second circulation pump 43 is provided on the heat exchange outlet pipe 411 to drive the hot water to be exchanged to circulate to the plate heat exchanger 42. A flow switch 44 is fixedly installed on the heat exchange inlet pipe 412 to monitor the water flow status during the heat exchange circulation process.

[0062] When the second circulation pump 43 is running, it can transport the hot water at the top of the cold water storage tank 1 to the heat exchange outlet pipe 411 through the heat exchange outlet 12, and allow the hot water to flow into the plate heat exchanger 42 for heat exchange through the heat exchange outlet pipe 411. After the heat exchange and cooling, the cold water flows into the bottom of the cold water storage tank 1 through the heat exchange inlet pipe 412 and the heat exchange inlet 14 on the cold water storage tank 1 for storage. During the process of the cold water flowing into the cold water storage tank 1 through the heat exchange inlet pipe 412, the flow switch 44 monitors the water flow status in the heat exchange circulation pipeline 41 and sends the monitoring signal to the controller so as to control the second circulation pump 43 intelligently according to the water flow in the heat exchange circulation pipeline 41.

[0063] Reference Figure 1 and Figure 4The refrigeration components include a compressor 52, a finned heat exchanger 53, and an electronic expansion valve 54. The compressor 52, finned heat exchanger 53, and electronic expansion valve 54 are all prior art and will not be described in detail in this application. In this application, the compressor 52, finned heat exchanger 53, and electronic expansion valve 54 are connected in series via a refrigerant circulation pipe 51. After exchanging heat with cold water in the plate heat exchanger 42, the refrigerant evaporates into a low-temperature, low-pressure gaseous state. After being compressed by the compressor 52, it becomes a high-temperature, high-pressure gaseous state. The high-temperature, high-pressure gaseous refrigerant flows through the finned heat exchanger 53 and comes into contact with the external environment. Simultaneously, a high-speed fan causes the air on the surface of the finned heat exchanger 53 to flow rapidly, transferring heat from the refrigerant to the air. As the heat is released, the refrigerant gradually condenses into a high-pressure, low-temperature liquid state. When the refrigerant passes through the electronic expansion valve 54, its pressure drops sharply, turning it into a low-pressure, low-temperature mist, which flows to the plate heat exchanger 42 to exchange heat with the cold water, thereby rapidly cooling the cold water.

[0064] In further implementation, the outlet end of the plate heat exchanger 42 is equipped with a low-pressure sensor 55 to detect the pressure of the refrigerant after evaporation, and the outlet end of the compressor 52 is equipped with a high-pressure sensor 56 to detect the pressure of the refrigerant after compression. The low-pressure sensor 55 and the high-pressure sensor 56 can transmit the sensing signals to the controller. The controller can dynamically adjust the speed of the compressor 52 and the opening of the electronic expansion valve 54 according to the pressure change, thereby optimizing energy efficiency and adjusting the cooling efficiency of the chilled water.

[0065] A fourth temperature sensor is installed at the outlet end of compressor 52 to monitor the refrigerant compression temperature T4 and transmits the temperature signal to the controller in real time. A fifth temperature sensor is installed at the outlet end of electronic expansion valve 54 to monitor the refrigerant expansion temperature T5. A sixth temperature sensor is installed on the outside of finned heat exchanger 53 to monitor the ambient temperature T6 at finned heat exchanger 53 and feeds the signal back to the controller. The controller comprehensively regulates the refrigeration cycle system 5 by considering the refrigerant compression temperature T4, refrigerant expansion temperature T5, and ambient temperature T6. It intelligently adjusts the operating parameters of the refrigeration cycle system 5 to ensure stable and efficient cooling effect, while reducing energy consumption and improving overall operational reliability.

[0066] A gas-liquid separator 57 is provided between the plate heat exchanger 42 and the compressor 52 to trap liquid refrigerant. The gas-liquid separator 57 adopts existing technology and will not be described in detail here. It only needs to meet the function of separating refrigerant gas and liquid to prevent liquid refrigerant from entering the compressor 52, thereby avoiding damage to the compressor 52 caused by direct compression of liquid refrigerant. A filter 58 is provided between the finned heat exchanger 53 and the electronic expansion valve 54 to filter refrigerant impurities. The filter 58 adopts existing technology and will not be described in detail here. It only needs to meet the function of filtering refrigerant impurities to protect the internal components of the refrigeration cycle system 5 from contamination, thereby extending the service life of the refrigeration cycle system 5.

[0067] In further implementation, to improve the cooling effect on bulk grain silos in high-temperature summer environments and save energy, the heat exchange circulation system 4 and the refrigeration circulation system 5 can operate during off-peak hours at night to exchange heat with the water in the cold water storage tank 1 and store cold water through the cold water storage tank 1. When the daytime temperature is high, cold water can be quickly supplied to the cold water pipe 2 through the cold water storage tank 1, and the water temperature can be significantly reduced in a short time. This ensures that the cold water pipe 2 continuously provides a low-temperature environment for the bulk grain silos, further optimizing the overall cooling efficiency of the bulk grain silos. At the same time, it prevents the heat exchange circulation system 4 and the refrigeration circulation system 5 from operating at high loads during the day, reducing energy consumption.

[0068] Based on the changes in ambient temperature and temperature within the bulk grain silo, the implementation principle of this embodiment is as follows: Operating Condition 1: When the water temperature in the cold water return pipe 312 is lower than the water temperature in the cold water storage tank 1, cold water is circulated through the cold water supply pipe 311, cold water return pipe 312, and circulation branch pipe 313 to cool the bulk grain silo. In practice, a three-dimensional distributed temperature monitoring network is formed by the temperature sensing element 23 to monitor the temperature of the silo walls and ground, and the temperature signal is transmitted to the controller. When a higher temperature is detected in some areas, the controller controls the water distribution manifold 32 to adjust the temperature. The corresponding opening and closing component 33 is opened, and the first circulation pump 34 is continuously operated, so that cold water flows through the water distribution end 321 of the water distributor 32 to the cold water pipe 2, so that the cold water exchanges heat with the high temperature zone 101 to cool the bulk grain silo. The heated water flows through the other end of the cold water pipe 2 to the water collection end 322 of the water distributor 32, and the first circulation pump 34 drives the cold water to circulate in the cold water return pipe 312, the circulation branch pipe 313 and the cold water supply pipe 311 for cooling.

[0069] Operating Condition 2: When the water temperature in the cold water return pipe 312 is higher than the water temperature in the cold water storage tank 1, cold water circulation is achieved through the cold water supply pipe 311, cold water return pipe 312, circulation branch pipe 313, and cold water storage tank 1. This causes the first circulation pump 34 to operate, continuously supplying cold water to the cold water pipe 2 through the cold water supply pipe 311. The controller adjusts the three-way regulating valve 35 according to the water temperature in the cold water supply pipe 311. If the water temperature in the cold water supply pipe 311 is low, some of the heated water enters the cold water storage tank. In the high-temperature zone 101 of tank 1, another part of the water flows through the circulation branch pipe 313 and mixes with the cold water flowing out of the low-temperature zone 103 of the cold water storage tank 1 before flowing into the cold water supply pipe 311. If the water temperature in the cold water supply pipe 311 is high, the heated water will flow completely into the high-temperature zone 101 of the cold water storage tank 1, and the cold water in the low-temperature zone 103 of the cold water storage tank 1 will flow into the cold water supply pipe 311. This ensures that the water in the cold water supply pipe 311 has the set water temperature while reducing the cold water consumption in the cold water storage tank 1.

[0070] Operating Condition 3: When the ambient temperature is low, the water in the cold water storage tank 1 is kept at a low temperature by the flow of water in the cold water circulation system 3 and the heat exchange circulation system 4. The heated water flows continuously into the cold water storage tank 1 through the cold water return pipe 312, raising the water temperature in the cold water storage tank 1. Then, the second circulation pump 43 continues to operate to transport the water to the plate heat exchanger 42. The plate heat exchanger 42 allows the water to come into large-area contact with the air for heat exchange. The cooled water after heat exchange flows into the heat exchange inlet 14 of the cold water storage tank 1 through the heat exchange inlet pipe 412. The water is then evenly distributed into the low-temperature zone 103 of the cold water storage tank 1 through the water distribution ring 15 on the heat exchange inlet 14, so that the cooled water can flow to the cold water supply pipe 311.

[0071] Operating Condition 4: When the ambient temperature is high, the heat exchange circulation system 4 and the refrigeration circulation system 5 are controlled to operate during off-peak electricity hours at night to exchange heat with the water in the cold storage tank 1. When the second circulation pump 43 continues to operate and continuously delivers water to the plate heat exchanger 42, the compressor 52 continues to operate and drives the refrigerant to circulate in the refrigerant circulation pipe 51. In the plate heat exchanger 42, the water and the refrigerant exchange heat to cool the water. The cooled low-temperature water flows into the cold storage tank 1 for storage through the heat exchange inlet pipe 412 and the heat exchange inlet 14. When the daytime temperature is high, the low-temperature water stored in the cold storage tank 1 flows to the cold water supply pipe 311, thereby reducing energy consumption while ensuring the water supply effect to the cold water pipe 2.

[0072] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A low-temperature intelligent control device for bulk grain storage, comprising a cold water tank (1) and multiple sets of cold water pipes (2) buried in the walls and ground of the bulk grain silo, characterized in that, Also includes: A cold water circulation system (3) is connected to the cold water storage tank (1) and the cold water pipe (2) for cold water circulation. The cold water circulation system (3) includes a cold water circulation pipeline (31) and a manifold (32). The manifold (32) is connected between the cold water circulation pipeline (31) and multiple sets of cold water pipes (2). Multiple independent opening and closing components (33) for controlling the opening and closing of the cold water pipes (2) are installed on the manifold (32). A heat exchange circulation system (4) is connected to a heat exchange circulation pipeline (41) and a plate heat exchanger (42). The heat exchange circulation pipeline (41) is connected to the cold water storage tank (1) and the plate heat exchanger (42) so that the water entering and leaving the cold water storage tank (1) circulates to the plate heat exchanger (42). The refrigeration cycle system (5) includes a refrigerant circulation pipe (51), the two ends of which are connected to the plate heat exchanger (42) for refrigerant circulation. A refrigeration component is connected to the refrigerant circulation pipe (51) to cool the water flowing through the plate heat exchanger (42). The water in the cold water storage tank (1) circulates from the heat exchange circulation pipe (41) to the plate heat exchanger (42) and exchanges heat with the refrigeration cycle system (5) for cooling. The water in the cold storage tank (1) is vertically layered into a high temperature zone (101), a medium temperature zone (102) and a low temperature zone (103). The high temperature zone (101) of the cold storage tank (1) is provided with a circulation inlet (11) and a heat exchange outlet (12). The low temperature zone (103) of the cold storage tank (1) is provided with a circulation outlet (13) and a heat exchange inlet (14). The circulation inlet (11) and the circulation outlet (13) are respectively connected to both ends of the cold water circulation pipeline (31). The heat exchange outlet (12) and the heat exchange inlet (14) are respectively connected to both ends of the heat exchange circulation pipeline (41). The ends of the circulation inlet (11) and the heat exchange inlet (14) are each provided with a water distribution ring (15) for uniformly supplying water into the cold storage tank (1). The cold water circulation pipeline (31) includes a cold water supply pipe (311), a cold water return pipe (312), and a circulation branch pipe (313). A first circulation pump (34) for driving cold water circulation is installed on the cold water supply pipe (311). The circulation branch pipe (313) is connected between the cold water supply pipe (311) and the cold water return pipe (312). A three-way regulating valve (35) is installed at the connection between the cold water return pipe (312) and the circulation branch pipe (313). The heat exchange circulation pipeline (41) includes a heat exchange outlet pipe (411) and a heat exchange inlet pipe (412). The heat exchange outlet pipe (411) is equipped with a second circulation pump (43) that drives the hot water to be exchanged to circulate to the plate heat exchanger (42). The heat exchange inlet pipe (412) is equipped with a flow switch (44) that monitors the water flow status during the heat exchange circulation process.

2. The low-temperature intelligent control device for bulk grain storage according to claim 1, characterized in that: The cold water pipe (2) includes a ground branch pipe (21) and a warehouse wall branch pipe (22). The ground branch pipe (21) and the warehouse wall branch pipe (22) are independently connected to the water distribution manifold (32). The layout density of the warehouse wall branch pipe (22) is greater than that of the ground branch pipe (21).

3. The low-temperature intelligent control device for bulk grain storage according to claim 2, characterized in that: The low-temperature intelligent control device also includes a controller for low-temperature intelligent control. Each set of cold water pipes (2) is provided with a temperature sensing element (23) for detecting the temperature of the warehouse wall or ground of the bulk grain warehouse. The controller controls the opening and closing element (33) to open and close according to the temperature signal of the temperature sensing element (23) so that the corresponding cold water pipe (2) is open or closed.

4. The low-temperature intelligent control device for bulk grain storage according to claim 1, characterized in that: The side wall of the cold water storage tank (1) is a double-layer vacuum structure, and the side wall of the cold water storage tank (1) is provided with a heat insulation interlayer (6).

5. The low-temperature intelligent control device for bulk grain storage according to claim 1, characterized in that: The outlet of the first circulating pump (34) is equipped with a first temperature sensor to monitor the cold water supply temperature T1, and the inlet of the three-way regulating valve (35) is equipped with a second temperature sensor to monitor the cold water return temperature T2. The interior of the cold water storage tank (1) is equipped with a third temperature sensor to monitor the water temperature T3 inside the cold water storage tank (1). When T3≥T2, the three-way regulating valve (35) is closed so that the cold water flows only through the circulating branch pipe (313) to the cold water supply pipe (311). When T3<T2, the three-way regulating valve (35) adjusts the opening according to the cold water supply temperature T1 to regulate the amount of water flowing through the cold water storage tank (1).

6. The low-temperature intelligent control device for bulk grain storage according to claim 5, characterized in that: A differential pressure bypass valve (36) for adjusting the pressure difference between the cold water supply pipe (311) and the cold water return pipe (312) is provided, and an expansion tank (37) for adjusting the water supply pressure is provided on the cold water supply pipe (311).

7. The low-temperature intelligent control device for bulk grain storage according to claim 1, characterized in that: The refrigeration assembly includes a compressor (52), a finned heat exchanger (53), and an electronic expansion valve (54). The compressor (52), the finned heat exchanger (53), and the electronic expansion valve (54) are connected in series via the refrigerant circulation pipe (51). The outlet end of the plate heat exchanger (42) is equipped with a low-pressure sensor (55) for detecting the pressure of the refrigerant after evaporation, and the outlet end of the compressor (52) is equipped with a high-pressure sensor (56) for detecting the pressure of the refrigerant after compression. The controller receives the pressure signals from the low-pressure sensor (55) and the high-pressure sensor (56) to control the operation of the compressor (52).

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