Low-temperature intelligent control device for bulk grain storage

Abstract

The invention relates to a low-temperature intelligent control device for bulk grain storage, which comprises a cold storage water tank, a plurality of groups of cold water pipes and a controller, the cold water pipes and the controller are embedded in the wall of a bulk grain bin and the ground, and the low-temperature intelligent control device further comprises a cold water circulation system, a heat exchange circulation system and a refrigeration circulation system, a plurality of opening and closing parts for independently controlling on and off of a cold water pipe are installed on the water dividing and collecting device, the heat exchange circulation system comprises a heat exchange circulation pipeline and a plate heat exchanger so that water in the cold storage water tank can flow towards the plate heat exchanger to conduct circulation heat exchange, and the refrigeration circulation system comprises a refrigerant circulation pipe. And the refrigerant circulating pipe is connected with a refrigeration assembly for driving phase change and thermodynamic circulation of a refrigerant. Through cooperation of the cold water circulation system, the heat exchange circulation system and the refrigeration circulation system, intelligent and efficient cooling of the interior of the bulk granary is achieved, and it is ensured that all areas have a uniform and stable low-temperature environment.

Description

Technical Field

[0001] The present 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 Art

[0002] During the storage of bulk grain, currently, the bulk grain is mainly stored in a bulk grain bin by centralized stacking. In order to prevent mildew and pests from occurring during the storage of bulk grain, the internal temperature of the bulk grain bin is usually controlled at a relatively low level.

[0003] Existing bulk grain bins usually adopt an air-conditioning cooling method to maintain a low-temperature environment in the bulk grain bin. By connecting the air conditioner and the air outlet pipe, a cold air inner circulation is formed inside the bulk grain bin, so as to keep the temperature of the grain pile uniform.

[0004] However, since a large amount of bulk grain is piled up in the bulk grain bin, which affects the fluidity of the cold air, the cold air can only reduce the temperature above the grain surface, and cannot solve the temperature problems around the grain pile and at the bottom. When the sun shines on the bin wall of the bulk grain bin, the temperature of the bin wall of the bulk grain bin will rise rapidly, and the problem of low temperature inside the grain pile and high temperature in the area near the bin wall will occur in the bulk grain pile, resulting in non-uniform distribution of the temperature of the bulk grain pile, and the grain in the area near the bin wall is prone to deterioration due to high temperature. Summary of the Invention

[0005] Aiming at the deficiencies existing in the prior art, the purpose of the present 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 storage tank and multiple groups of cold water pipes buried in the bin wall and the ground of the bulk grain bin, and further includes: a cold water circulation system, the cold water circulation system connects the cold water storage tank and the cold water pipes to supply cold water to circulate, the cold water circulation system includes a cold water circulation pipeline and a manifold, the manifold is connected between the cold water circulation pipeline and multiple groups of the cold water pipes, and a plurality of opening and closing members for independently controlling the on-off of the cold water pipes are installed on the manifold; A heat exchange circulation system, the heat exchange circulation system includes a heat exchange circulation pipeline and a plate heat exchanger, the heat exchange circulation pipeline connects the cold water storage tank and the plate heat exchanger to make the water body entering and leaving the cold water storage tank circulate towards the plate heat exchanger; A refrigeration circulation system, the refrigeration circulation system includes a refrigerant circulation pipe, both ends of the refrigerant circulation pipe are communicated with the plate heat exchanger to supply refrigerant to circulate, and a refrigeration component for refrigerating the water body flowing through the plate heat exchanger is connected to the refrigerant circulation pipe; The water body in the cold water storage tank circulates towards the plate heat exchanger through the heat exchange circulation pipeline and exchanges heat with the refrigeration circulation system for refrigeration.

[0007] By adopting the above technical solution, the collaborative cooperation of the cold water circulation system, the heat exchange circulation system and the refrigeration circulation system realizes the intelligent and efficient cooling inside the bulk grain storage bin, ensuring a uniform and stable low-temperature environment in each area.

[0008] The present invention is further configured as: the cold water pipe includes a ground branch pipe and a bin wall branch pipe, the ground branch pipe and the bin wall branch pipe are independently communicated with the manifold respectively, and the layout density of the bin wall branch pipe is greater than that of the ground branch pipe.

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

[0010] The present invention is further configured as: the low-temperature intelligent control device further includes a controller for performing low-temperature intelligent control. A temperature measuring sensor for detecting the temperature of the bin wall or the ground of the bulk grain storage bin is provided on the outer side of each group of cold water pipes. The controller controls the opening and closing of the opening and closing member according to the temperature signal of the temperature measuring sensor so that the corresponding cold water pipe is turned on and off.

[0011] By adopting the above technical solution, the temperature measuring sensors form a three-dimensional distributed temperature measuring network, which can accurately monitor the temperature of the bin wall and the ground of the bulk grain storage bin, facilitate controlling the cold water pipes in the corresponding area for accurate cooling, and reduce the ineffective energy consumption.

[0012] The present invention is further configured as: the water body in the cold water storage tank is vertically stratified to form a high-temperature area, a medium-temperature area and a low-temperature area. A circulating water inlet and a heat exchange water outlet are provided in the high-temperature area of the cold water storage tank. A circulating water outlet and a heat exchange water inlet are provided in the low-temperature area of the cold water storage tank. The circulating water inlet and the circulating water outlet are respectively connected to both ends of the cold water circulation pipeline. The heat exchange water outlet and the heat exchange water inlet are respectively connected to both ends of the heat exchange circulation pipeline. Water distribution rings for enabling the water body to uniformly enter the cold water storage tank are provided at the ends of the circulating water inlet and the heat exchange water inlet.

[0013] By adopting the above technical solution, when the water body in the cold water storage tank circulates in the cold water circulation system and the heat exchange circulation system, the water bodies at different temperatures are stably stratified in the cold water storage tank, which can avoid too large local temperature difference, improve the overall cooling efficiency. At the same time, the water distribution ring can make the hot water or cold water flowing into the cold water storage tank more evenly distributed.

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

[0015] By adopting the above technical solution, the setting of the double-layer vacuum side wall and the heat preservation interlayer can further improve the heat preservation effect of the cold water storage tank. In winter, the water body is assisted to 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 as: 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 the 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. 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 and flow of the 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 the cold water in the cold water storage tank.

[0018] The present invention is further configured as: a first temperature sensor for monitoring the cold water supply temperature T1 is provided at the water outlet end of the first circulation pump. A second temperature sensor for monitoring the cold water return temperature T2 is provided at the water inlet end of the three-way regulating valve. A third temperature sensor for monitoring the water temperature T3 in the cold water storage tank is provided inside the cold water storage tank. When T3≥T2, the three-way regulating valve is closed so that the cold water only flows through the circulation branch pipe to the cold water supply pipe. When T3<T2, the three-way regulating valve adjusts the opening degree according to the cold water supply temperature T1 to control 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 T3 in the cold water storage tank are monitored. The controller precisely regulates the three-way regulating valve according to the temperature signal, realizing the intelligent optimization of the cold water circulation path, while continuously creating a low-temperature environment for the bulk grain warehouse and reducing the consumption of cold water.

[0020] The present invention is further configured as: a differential pressure bypass valve for adjusting the differential pressure between the supply and return water is provided between the cold water supply pipe and the cold water return pipe. An expansion tank for adjusting the supply water 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 supply water pressure in the cold water circulation system, ensuring the uniform and stable water pressure in the cold water pipe and extending the service life of the cold water pipe.

[0022] The present invention is further configured as: the heat exchange circulation pipeline includes a heat exchange outlet pipe and a heat exchange inlet pipe. A second circulation pump for driving the water body to be exchanged for heat to circulate to the plate heat exchanger is provided on the heat exchange outlet pipe. A flow switch for monitoring the water flow state during the heat exchange circulation is provided on the heat exchange inlet pipe.

[0023] By adopting the above technical solution, the second circulation pump and the flow switch cooperate with each other, facilitating the regulation of the water flow velocity in the heat exchange circulation system to improve the heat exchange effect of the water body at the plate heat exchanger.

[0024] The present invention is further configured as: the refrigeration assembly includes a compressor, a fin heat exchanger, and an electronic expansion valve. The compressor, the fin heat exchanger, and the electronic expansion valve are sequentially connected in series and communicated through the refrigerant circulation pipe. A low-pressure sensor for detecting the pressure after refrigerant evaporation is provided at the outlet end of the plate heat exchanger, and a high-pressure sensor for detecting the pressure after refrigerant compression is provided at the outlet end of the compressor. 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 circulation system and the heat exchange circulation system cooperate with each other, enabling continuous heat exchange and storage of the water body in the cold water storage tank.

[0026] In summary, the beneficial technical effects of the present invention are as follows: Through the mutual cooperation of the cold water circulation system, the heat exchange circulation system, and the refrigeration circulation system, cold water can circulate in the cold water pipe, forming a three-dimensional cooling system on the outer side of the bulk grain pile, and precisely cooling the wall and ground of the bulk grain bin, effectively isolating the influence of the external temperature on the interior of the bulk grain bin, enabling each area of the bulk grain pile to have a uniform and stable low-temperature environment, and improving the storage effect of the bulk grain; By setting multiple groups 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 precisely regulates the three-way regulating valve according to the temperature signals, realizing intelligent optimization of the cold water circulation path, reducing cold water consumption while continuously creating a low-temperature environment for the bulk grain bin.

[0027] Through the coordinated cooperation of the heat exchange circulation system and the refrigeration circulation system, the water body in the cold water storage tank 1 is heat-exchanged and cooled, and the cold water is stored, which can reduce the cold water supply pressure during high-temperature periods, further optimize the overall cooling efficiency of the bulk grain bin while efficiently maintaining the low-temperature environment of the bulk grain bin, and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0030] Figure 3 is the system control diagram of the heat exchange circulation system in the present application.

[0031] Figure 4 is the system control diagram of the refrigeration circulation system in the present application.

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

[0033] Figure 6 It is the second structural schematic diagram of the cold storage water tank in the present application.

[0034] Figure 7 It is the laying schematic diagram of the cold water pipe in the present application.

[0035] In the figure: 1. Cold storage water tank; 101. High-temperature area; 102. Medium-temperature area; 103. Low-temperature area; 11. Circulation inlet; 12. Heat exchange outlet; 13. Circulation outlet; 14. Heat exchange inlet; 15. Water distribution ring; 16. Make-up water port; 17. Drain port; 18. Exhaust valve; 2. Cold water pipe; 21. Ground branch pipe; 22. Silo wall branch pipe; 23. Temperature measuring 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. Water distribution end; 322. Water collection end; 33. Opening and closing member; 34. First circulation pump; 35. Three-way regulating valve; 36. Differential pressure bypass valve; 37. 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. Thermal insulation layer; 61. Heating element. Detailed implementation manners

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

[0037] Refer to Figures 1-7 , a low-temperature intelligent control device for storing bulk grain disclosed by the present invention, includes a cold storage water tank 1, a plurality of groups of cold water pipes 2 buried in the silo wall and the ground of the bulk grain silo, 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 allow cold water to circulate. The manifold 32 is connected between the cold water circulation pipeline 31 and multiple groups of cold water pipes 2. A plurality of opening and closing members 33 for independently controlling the on / off of the cold water pipes 2 are installed on the manifold 32. The opening and closing members 33 can adopt a valve port structure, an electromagnetic valve structure, or an electrothermal valve structure. In this embodiment, the opening and closing member 33 adopts a direct-through electrothermal valve structure. Each group of cold water pipes 2 can be independently connected to the manifold 32 through the opening and closing member 33. The controller controls the opening and closing of the opening and closing member 33 to dynamically adjust the on / off conditions of the cold water pipes 2 at different positions, so as to independently control the water volume and flow condition in each group of cold water pipes 2, facilitate precise cooling according to the temperature distribution in the bulk grain storage bin, 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 to enable the water body entering and leaving the cold water storage tank 1 to circulate towards the plate heat exchanger 42.

[0040] The refrigeration circulation system 5 includes a refrigerant circulation pipe 51. Both ends of the refrigerant circulation pipe 51 are connected to the plate heat exchanger 42 to allow the refrigerant to circulate. A refrigeration component for refrigerating the water body flowing through the plate heat exchanger 42 is connected to the refrigerant circulation pipe 51. The water body in the cold water storage tank 1 circulates from the heat exchange circulation pipeline 41 towards the plate heat exchanger 42 and exchanges heat with the refrigeration circulation system 5 for refrigeration. By controlling the refrigerant flow in different phase change states in the refrigerant circulation pipe 51 to circulate, and enabling the water body to exchange heat with the refrigerant in the plate heat exchanger 42, the water body can be quickly cooled down.

[0041] During the low-temperature storage of bulk grain, this application is used in conjunction with a traditional bulk grain storage bin air-conditioning system. The air-conditioning system is installed on the top of the bulk grain storage bin and can cool the area above the grain surface after refrigeration. The cold water pipes 2 are buried in the bin wall and the ground of the bulk grain storage bin and can cool the surroundings and the bottom of the bulk grain pile, thereby forming a three-dimensional low-temperature isolation layer on the outside of the bulk grain pile to ensure a uniform and stable low-temperature environment for the bulk grain pile.

[0042] Refer to Figures 1-4 Through the mutual cooperation 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 pipes 2 and cool the surroundings and the bottom of the bulk grain pile, thereby forming a three-dimensional cooling system on the outside of the bulk grain pile to isolate the influence of the external temperature on the inside of the bulk grain storage bin, making each area inside the bulk grain storage bin have a uniform and stable low-temperature environment, so as to improve the low-temperature storage effect of the bulk grain.

[0043] Through the mutual cooperation of the cold water circulation system 3 and the heat exchange circulation system 4, a double closed-loop control of cold water can be formed, so as to continuously and efficiently circulate and transport low-temperature water bodies to the cold water pipe 2, thereby improving the cooling effect inside the bulk grain storage bin. Through the mutual cooperation of the heat exchange circulation system 4 and the refrigeration circulation system 5, the heated water bodies in the cold water storage tank 1 can be quickly heat-exchanged, and a significant reduction in water temperature can be achieved in a short time. With the coordinated cooperation of the cold water storage tank 1, the cold water pipe 2, the cold water circulation system 3, the heat exchange circulation system 4 and the refrigeration circulation system 5, the manufacturing, storage and distribution of cold water can be designed in a closed loop, so as to facilitate the intelligent and efficient cooling of the inside of the bulk grain storage bin.

[0044] Referring to Figure 2 、 Figure 5 and Figure 6 , the water temperature inside the cold water storage tank 1 will show a vertical stratification phenomenon. Inside the cold water storage tank 1, there are a high-temperature area 101, a medium-temperature area 102 and a low-temperature area 103 corresponding to the corresponding water temperature layers. The high-temperature area 101 of the cold water storage tank 1 is provided with an integrally formed circulating water inlet 11 and a heat exchange water outlet 12. The low-temperature area 103 of the cold water storage tank 1 is provided with an integrally formed circulating water outlet 13 and a heat exchange water inlet 14. The circulating water inlet 11 and the circulating water outlet 13 are respectively connected to both ends of the cold water circulation pipeline 31 for cold water to flow into the cold water pipe 2. The heat exchange water outlet 12 and the heat exchange water inlet 14 are respectively connected to both ends of the heat exchange circulation pipeline 41 for hot water heat exchange and cooling. The ends of the circulating water inlet 11 and the heat exchange water inlet 14 are both fixed with a water distribution ring 15 for the water body to uniformly enter the cold water storage tank 1 through bolts. The water distribution ring 15 enables the water body to uniformly enter the inside of the cold water storage tank 1 by opening uniformly distributed micropores. The water distribution ring 15 connected to the circulating water inlet 11 can enable the hot water returned by the cold water circulation system 3 to uniformly enter the high-temperature area 101, and the water distribution ring 15 connected to the heat exchange water inlet 14 can enable the low-temperature water body cooled by the heat exchange circulation system 4 to uniformly enter the low-temperature area 103, thereby ensuring uniform water temperature distribution inside the cold water storage tank 1, avoiding excessive local temperature difference, and improving the overall cooling efficiency.

[0045] In the specific implementation process, the vertical height of the heat exchange water outlet 12 provided on the cold water storage tank 1 is higher than that of the circulating water inlet 11, and the vertical height of the heat exchange water inlet 14 provided on the cold water storage tank 1 is lower than that of the circulating water outlet 13. Through the heat exchange water outlet 12, the water body in the high-temperature area 101 of the cold water storage tank 1 can be transported to the heat exchange circulation system 4, and after heat exchange and cooling through the plate heat exchanger 42, the water body with the lowest water temperature can uniformly flow into the low-temperature area 103 of the cold water storage tank 1 through the water distribution ring 15 at the end of the heat exchange water inlet 14 for cold storage. When cooling the bulk grain storage bin, the water body in the low-temperature area 103 of the cold water storage tank 1 is transported to the cold water pipe 2 through the circulating water outlet 13, and after the water body gets heated, it flows back into the inside of the cold water storage tank 1 through the water distribution ring 15 at the end of the circulating water inlet 11, ensuring precise control of the water temperature in each area and further improving the cooling effect.

[0046] In the further implementation process, a water replenishment port 16 is provided at the top of the chilled water storage tank 1. The water replenishment port 16 is sealed by a threaded head. When the water level in the chilled water storage tank 1 is insufficient, the threaded head is removed, and water can be added to the chilled water storage tank 1 through the water replenishment port 16. In addition, an exhaust valve 18 is installed at the top of the chilled water storage tank 1 to quickly discharge the residual air in the tank and maintain the air pressure balance inside and outside the tank. A sewage discharge port 17 is provided at the bottom of the chilled water storage tank 1, and the sewage discharge port 17 is sealed by a threaded head to facilitate regular sewage discharge of the chilled water storage tank 1.

[0047] Refer to Figure 6 , in order to improve the heat preservation effect of the chilled water storage tank 1, the side wall of the chilled water storage tank 1 is of a double-layer vacuum structure, and a heat preservation interlayer 6 is provided in the side wall of the chilled water storage tank 1. The heat preservation interlayer 6 is filled with high-efficiency heat-insulating materials, such as polyurethane foam, glass wool or other heat-insulating and heat-preserving materials, which can isolate the heat exchange inside and outside the chilled water storage tank 1 to keep the cold water warm. In addition, considering that the cold water pipe 2 needs to be antifreeze when used in winter to avoid the cold water pipe 2 from bursting due to the freezing of the water body, a heating element 61 is installed in the heat preservation interlayer 6 of the chilled water storage tank 1. The heating element 61 adopts a circular electric heating belt, which can be attached to the side wall of the chilled water storage tank 1 and heat the water body in the chilled water storage tank 1, and the water body circulates 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 always remains above zero degrees Celsius, prevent the freezing phenomenon from occurring, and avoid the cold water pipe 2 from bursting due to freezing and affecting the storage of bulk grain.

[0048] Refer to Figure 1 , Figure 2 and Figure 7 , the cold water pipe 2 includes a ground branch pipe 21 arranged in the ground and a bin wall branch pipe 22 arranged in the bin wall. Both the ground branch pipe 21 and the bin wall branch pipe 22 have multiple groups, and each group of branch pipes is independently connected to the manifold 32. The opening and closing member 33 provided on the manifold 32 is used to individually control the on-off of each group of ground branch pipes 21 or bin wall branch pipes 22 to facilitate precise cooling of different areas of the bulk grain bin.

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

[0050] In the specific implementation process, considering that the bin wall of the bulk grain bin is easily heated rapidly by sunlight, the layout density of the bin wall branch pipe 22 is greater than that of the ground branch pipe 21 to improve the cooling efficiency of the bin wall of the bulk grain bin, reduce the influence of sunlight on the temperature rise of the bulk grain bin, and ensure a uniform and stable low-temperature environment around the bulk grain pile.

[0051] In the further implementation process, due to the different irradiation positions of the sun on the bulk grain bin at different time periods, in the direct sunlight area, the temperature of the bin wall of the bulk grain bin will rise rapidly, while in other areas not directly irradiated by the sun, the temperature change of the bin wall of the bulk grain bin is small, which will cause the temperature inside the bulk grain bin to be unevenly distributed. In order to improve the cooling effect of the cold water pipe 2 on different areas and ensure the uniform distribution of the temperature inside the bulk grain bin, temperature measuring sensors 23 are buried in both the bin wall and the ground of the bulk grain bin. In this embodiment, the temperature measuring sensor 23 uses a temperature measuring cable, and the temperature measuring cable is distributed adjacent to the cold water pipe 2, which can form a three-dimensional distributed temperature measuring network to monitor the temperature of the bin wall and the ground of the bulk grain bin, and transmit the temperature signal to the controller, so that the controller can control the opening and closing of the opening and closing member 33 on the water distribution and collection device 32 according to the temperature distribution in the bulk grain bin to make the corresponding cold water pipe 2 on and off, thereby establishing a three-dimensional cooling system for the bulk grain bin, realizing precise cooling of the heating area, reducing ineffective energy consumption, and ensuring that each area of the bulk grain bin has a uniform and stable low-temperature environment, effectively avoiding grain deterioration.

[0052] In the further implementation process, partitions are fixedly installed on both the bin wall and the ground of the bulk grain bin by bolts. The partitions are arranged outside the cold water pipe 2, and phenolic foam sandwich panels, polyurethane sandwich panels or rock wool sandwich panels can be specifically used to improve the uniformity of the temperature change outside the cold water pipe 2 and avoid the wall of the bulk grain bin from condensing due to sudden low temperature.

[0053] Refer to 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 water distribution and collection device 32 includes a water distribution end 321 that independently supplies water to multiple cold water pipes 2 and a water collection end 322 that collects the return water of the cold water pipes 2. The cold water supply pipe 311 is connected between the circulation water outlet 13 of the cold water storage tank 1 and the water distribution end 321, the cold water return pipe 312 is connected between the circulation water inlet 11 of the cold water storage tank 1 and the water collection end 322. A first circulation pump 34 for driving 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 between the cold water return pipe 312 and the circulation branch pipe 313. The three-way regulating valve 35 uses a three-way ratio regulating valve, which can adjust the water flow rates of 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 in the closed state, the water in the cold water return pipe 312 does not flow through the cold water storage tank 1 and directly flows to the cold water supply pipe 311 through the circulation branch pipe 313. When the three-way regulating valve 35 is opened to the maximum state, the water in the cold water return pipe 312 does not flow through the circulation branch pipe 313 and completely flows 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 water outlet end of the first circulation pump 34 is provided with a first temperature sensor for monitoring the cold water supply temperature T1, the water inlet end of the three-way regulating valve 35 is provided with a second temperature sensor for monitoring the cold water return temperature T2, and the inside of the cold water storage tank 1 is provided with a third temperature sensor for monitoring the water temperature T3 in 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 only flows through the circulation branch pipe 313 to the cold water supply pipe 311 and does not flow through the cold water storage tank 1, and the cold water circulates in the cold water supply pipe 311, the cold water pipe 2, the cold water return pipe 312 and the circulation 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 control the water volume flowing through the cold water storage tank 1. If T1 is within the target temperature range, part of the water body flows through the circulation branch pipe 313 and the other part of the water body flows through the cold water storage tank 1, while ensuring that the water body in the cold water supply pipe 311 has a set water temperature, reducing the cold water consumption in the cold water storage tank 1; If T1 is much higher than the target temperature, the opening of the three-way regulating valve 35 is adjusted to the maximum, so that the return hot water in the cold water return pipe 312 completely flows into the cold water storage tank 1 and does not flow through the circulation branch pipe 313, and the cold water stored in the cold water storage tank 1 is conveyed to the cold water pipe 2 through the cold water supply pipe 311, so as to quickly cool the inside of the bulk grain storage bin.

[0057] During the process of cooling the bulk grain storage bin, in order to avoid the condensation phenomenon of the cold water pipe 2 due to the too large temperature difference between the temperature inside the bin and the water body temperature, the cold water supply temperature T1 can be controlled to gradually decrease according to the temperature of the bulk grain storage bin monitored by the temperature measuring sensor 23, so that the water temperature in the cold water pipe 2 decreases evenly, so that while cooling the bulk grain storage bin, the temperature difference between the water temperature in the cold water pipe 2 and the inside of the bulk grain storage bin is kept within a small range, effectively avoiding the condensation phenomenon on the surface of the cold water pipe 2.

[0058] In the further implementation process, considering that the cold water pipe 2 needs to be antifreeze when used in winter to avoid the cold water pipe 2 from cracking due to the freezing of the water body, the controller controls the operation of the first circulation pump 34 and the heating element 61 through the monitored temperature values T1, T2 and T3. The water body in the cold water storage tank 1 can be heated through the heating element 61 to ensure that the water temperature T3 in the cold water storage tank 1 is above zero degrees, and the water body in the cold water return pipe 312 is controlled to be mixed with the water body in the cold water storage tank 1 through the three-way regulating valve 35. During the process of water body circulation, 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, so as to ensure that the water temperature in the cold water pipe 2 is above zero degrees and avoid the internal freezing of the cold water pipe 2.

[0059] Refer to Figure 2, a 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 and communicated with the cold water supply pipe 311, and the other end of the differential pressure bypass valve 36 is fixedly connected and communicated with the cold water return pipe 312. The differential pressure between the supply and return water can be adjusted through the differential pressure bypass valve 36. When the differential pressure between the supply and return water is too high, the differential pressure bypass valve 36 opens to bypass part of the flow to reduce the differential pressure.

[0060] An expansion tank 37 is installed on the cold water supply pipe 311 and near the outlet end of the first circulation pump 34. When the water supply pressure is high, part of the water body flows into the expansion tank 37 for buffering to reduce the water supply pressure. When the water supply pressure is low, the water body in the expansion tank 37 flows into the cold water supply pipe 311 to increase the water supply pressure, thus 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, extending the service life of the cold water pipe 2.

[0061] Refer to 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, and 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 for driving the hot water to be exchanged to circulate towards the plate heat exchanger 42 is provided on the heat exchange outlet pipe 411, and a flow switch 44 for monitoring the water flow state during the heat exchange circulation process is fixedly installed on the heat exchange inlet pipe 412.

[0062] When the second circulation pump 43 operates, the hot water at the top of the cold storage water tank 1 can be conveyed through the heat exchange outlet 12 to the heat exchange outlet pipe 411, and the hot water flows into the plate heat exchanger 42 through the heat exchange outlet pipe 411 for heat exchange. The cooled cold water flows into the bottom of the cold storage water tank 1 through the heat exchange inlet pipe 412 and the heat exchange inlet 14 on the cold storage water tank 1 for storage. During the process of the cold water flowing towards the cold storage water tank 1 through the heat exchange inlet pipe 412, the flow switch 44 monitors the water flow state in the heat exchange circulation pipeline 41 and transmits the monitoring signal to the controller, so as to intelligently control the second circulation pump 43 according to the water flow in the heat exchange circulation pipeline 41.

[0063] Refer to Figure 1 and Figure 4, the refrigeration assembly includes a compressor 52, a fin heat exchanger 53, and an electronic expansion valve 54. The compressor 52, the fin heat exchanger 53, and the electronic expansion valve 54 are all prior arts and will not be elaborated in detail in this application. In this application, the compressor 52, the fin heat exchanger 53, and the electronic expansion valve 54 are sequentially connected in series and communicated through a refrigerant circulation pipe 51. After the refrigerant exchanges heat with cold water in the plate heat exchanger 42, it evaporates into a low-temperature and low-pressure gas state. After being compressed by the compressor 52, it becomes a high-temperature and high-pressure gas state. The high-temperature and high-pressure gaseous refrigerant flows through the fin heat exchanger 53 in contact with the external environment. At the same time, a high-speed blower is used to make the air on the surface of the fin heat exchanger 53 flow rapidly. The refrigerant transfers heat to the air. As the heat is released, the refrigerant gradually condenses into a high-pressure and low-temperature liquid state. When the refrigerant passes through the electronic expansion valve 54, its pressure drops suddenly to become a low-pressure and low-temperature mist state and flows to the plate heat exchanger 42 to exchange heat with cold water, thereby rapidly cooling the cold water.

[0064] In the further implementation process, a low-pressure sensor 55 for detecting the pressure after the refrigerant evaporates is provided at the outlet end of the plate heat exchanger 42, and a high-pressure sensor 56 for detecting the pressure after the refrigerant is compressed is provided at the outlet end of the compressor 52. The low-pressure sensor 55 and the high-pressure sensor 56 can transmit the induction signals to the controller. The controller can dynamically adjust the rotation speed of the compressor 52 and the opening degree of the electronic expansion valve 54 according to the pressure change, thereby optimizing the energy efficiency and adjusting the cooling efficiency of the cold water.

[0065] A fourth temperature sensor for monitoring the temperature T4 after the refrigerant is compressed is provided at the outlet end of the compressor 52, and the temperature signal is transmitted to the controller in real time. A fifth temperature sensor for monitoring the temperature T5 after the refrigerant expands is provided at the outlet end of the electronic expansion valve 54. A sixth temperature sensor for monitoring the ambient temperature T6 at the fin heat exchanger 53 is installed outside the fin heat exchanger 53, and the signal is fed back to the controller, so that the controller comprehensively regulates the refrigeration cycle system 5 after comprehensively considering the refrigerant compression temperature T4, the refrigerant expansion temperature T5, and the ambient temperature T6, intelligently adjusts the operating parameters of the refrigeration cycle system 5, ensures stable and efficient refrigeration effect, reduces energy consumption at the same time, and improves the overall operating reliability.

[0066] A gas-liquid separator 57 for intercepting liquid refrigerant is provided between the plate heat exchanger 42 and the compressor 52. The gas-liquid separator 57 is a prior art and will not be elaborated here. It only needs to satisfy the gas-liquid separation of the refrigerant to prevent liquid refrigerant from entering the compressor 52, avoiding damage to the compressor 52 caused by direct compression of liquid refrigerant. A filter 58 for filtering refrigerant impurities is provided between the fin heat exchanger 53 and the electronic expansion valve 54. The filter 58 is a prior art and will not be elaborated here. It only needs to satisfy the filtering of refrigerant impurities to protect the internal components of the refrigeration cycle system 5 from being polluted, thereby extending the service life of the refrigeration cycle system 5.

[0067] In the further implementation process, in order to improve the cooling effect of the bulk grain storage bin in the high-temperature environment in summer and save energy consumption, the heat exchange circulation system 4 and the refrigeration circulation system 5 can be operated during the valley electricity period at night to exchange heat for the water body in the cold water storage tank 1 and store the cold water through the cold water storage tank 1. When the temperature is relatively high during the day, the cold water storage tank 1 can quickly supply cold water to the cold water pipe 2, and significantly reduce the water temperature within a short period of time, ensuring that the cold water pipe 2 continuously provides a low-temperature environment for the bulk grain storage bin, further optimizing the overall cooling efficiency of the bulk grain storage bin, and at the same time preventing the heat exchange circulation system 4 and the refrigeration circulation system 5 from operating at high load during the day, reducing energy consumption.

[0068] According to the ambient temperature and the temperature change in the bulk grain storage bin, the implementation principle of this embodiment is as follows: 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 circulates through the cold water supply pipe 311, the cold water return pipe 312, and the circulation branch pipe 313 to cool the bulk grain storage bin. In specific implementation, a three-dimensional distributed temperature measurement network is formed by the temperature measurement sensing element 23 to monitor the temperature of the bin wall and the ground of the bulk grain storage bin, and the temperature signal is transmitted to the controller. When it is detected that the temperature in some areas is relatively high, the corresponding opening and closing member 33 on the distribution manifold 32 is controlled by the controller to open, and the first circulation pump 34 continuously operates, so that cold water flows from the water distribution end 321 of the distribution manifold 32 to the cold water pipe 2, and the cold water exchanges heat with the high-temperature area 101 to cool the bulk grain storage bin. The heated water body flows to the water collection end 322 of the distribution manifold 32 through the other end of the cold water pipe 2, 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] 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 circulates through the cold water supply pipe 311, the cold water return pipe 312, the circulation branch pipe 313, and the cold water storage tank 1. The first circulation pump 34 operates to continuously supply cold water to the cold water pipe 2 through the cold water supply pipe 311. The three-way regulating valve 35 is regulated by the controller according to the water temperature in the cold water supply pipe 311. If the water temperature in the cold water supply pipe 311 is relatively low, part of the heated water body enters the high-temperature area 101 of the cold water storage tank 1, and the other part of the water body flows through the circulation branch pipe 313 and is mixed with the cold water flowing out of the low-temperature area 103 of the cold water storage tank 1 and then flows into the cold water supply pipe 311. If the water temperature in the cold water supply pipe 311 is relatively high, the heated water body completely flows into the high-temperature area 101 of the cold water storage tank 1, and the cold water in the low-temperature area 103 of the cold water storage tank 1 flows into the cold water supply pipe 311, so as to ensure that the water body in the cold water supply pipe 311 has a set water temperature while reducing the consumption of cold water in the cold water storage tank 1.

[0070] Operating condition three: When the ambient temperature is relatively low, the water in the cold water storage tank 1 is kept at a relatively low temperature by the flow of water in the cold water circulation system 3 and the heat exchange circulation system 4. The heated water continuously flows into the cold water storage tank 1 through the cold water return pipe 312. After the water temperature in the cold water storage tank 1 rises, the second circulation pump 43 continuously operates to transport the water to the plate heat exchanger 42. Through the plate heat exchanger 42, the water is brought into large-area contact with the air for heat exchange. The cooled water flows into the heat exchange water inlet 14 of the cold water storage tank 1 through the heat exchange water inlet pipe 412, and through the water distribution ring 15 on the heat exchange water inlet 14, the cold water evenly flows into the low-temperature area 103 of the cold water storage tank 1 for storage, so as to facilitate the flow of cold water to the cold water supply pipe 311.

[0071] Operating condition four: When the ambient temperature is relatively high, the heat exchange circulation system 4 and the refrigeration circulation system 5 are controlled to operate during the off-peak electricity period at night to exchange heat for the water in the cold water storage tank 1. After the second circulation pump 43 continuously operates to transport the water to the plate heat exchanger 42, the compressor 52 continuously operates to drive the refrigerant to circulate in the refrigerant circulation pipe 51. When in the plate heat exchanger 42, the water exchanges heat with the refrigerant to cool the water. The cooled low-temperature water flows into the cold water storage tank 1 through the heat exchange water inlet pipe 412 and the heat exchange water inlet 14 for storage. When the daytime temperature is relatively high, the low-temperature water stored in the cold water storage tank 1 flows to the cold water supply pipe 311, so as to ensure the water supply effect to the cold water pipe 2 while reducing energy consumption.

[0072] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A low-temperature intelligent control device for storing bulk grain, comprising a cold water storage tank (1) and multiple groups of cold water pipes (2) buried in the wall and ground of the bulk grain storage bin, characterized in that, Further included are: A cold water circulation system (3), the cold water circulation system (3) connecting the cold water storage tank (1) and the cold water pipe (2) to supply cold water to circulate. 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 groups of the cold water pipes (2). A plurality of opening and closing members (33) for independently controlling the on-off of the cold water pipes (2) are installed on the manifold (32); A heat exchange circulation system (4), the heat exchange circulation system (4) including 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) to enable the water body entering and leaving the cold water storage tank (1) to circulate to the plate heat exchanger (42); A refrigeration circulation system (5), the refrigeration circulation system (5) including a refrigerant circulation pipe (51). Both ends of the refrigerant circulation pipe (51) are communicated with the plate heat exchanger (42) to supply refrigerant to circulate. A refrigeration component for refrigerating the water body flowing through the plate heat exchanger (42) is connected to the refrigerant circulation pipe (51); The water body in the cold water storage tank (1) circulates from the heat exchange circulation pipeline (41) to the plate heat exchanger (42) and exchanges heat with the refrigeration circulation system (5) for refrigeration.

2. The low-temperature intelligent control device for storing bulk grain according to claim 1, wherein: The cold water pipe (2) includes a ground branch pipe (21) and a bin wall branch pipe (22). The ground branch pipe (21) and the bin wall branch pipe (22) are independently communicated with the manifold (32) respectively. The layout density of the bin wall branch pipe (22) is greater than that of the ground branch pipe (21).

3. The low-temperature intelligent control device for storing bulk grain according to claim 2, wherein: The low-temperature intelligent control device further includes a controller for performing low-temperature intelligent control. A temperature measuring and sensing member (23) for detecting the temperature of the bin wall or the ground of the bulk grain storage bin is provided on the outer side of each group of the cold water pipes (2). The controller controls the opening and closing of the opening and closing member (33) according to the temperature signal of the temperature measuring and sensing member (23) to turn on and off the corresponding cold water pipe (2).

4. The low-temperature intelligent control device for storing bulk grain according to claim 1, characterized in that: The water body in the cold water storage tank (1) is vertically stratified to form a high-temperature zone (101), a medium-temperature zone (102) and a low-temperature zone (103). A circulating water inlet (11) and a heat exchange water outlet (12) are provided in the high-temperature zone (101) of the cold water storage tank (1). A circulating water outlet (13) and a heat exchange water inlet (14) are provided in the low-temperature zone (103) of the cold water storage tank (1). The circulating water inlet (11) and the circulating water outlet (13) are respectively connected to both ends of the cold water circulation pipeline (31). The heat exchange water outlet (12) and the heat exchange water inlet (14) are respectively connected to both ends of the heat exchange circulation pipeline (41). Water distribution rings (15) for enabling the water body to uniformly enter the cold water storage tank (1) are provided at the ends of the circulating water inlet (11) and the heat exchange water inlet (14).

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

6. The low-temperature intelligent control device for storing bulk grain according to claim 1, characterized in that: 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 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 between the cold water return pipe (312) and the circulation branch pipe (313).

7. The low-temperature intelligent control device for storing bulk grain according to claim 6, characterized in that: A first temperature sensor for monitoring the cold water supply temperature T1 is provided at the water outlet end of the first circulation pump (34). A second temperature sensor for monitoring the cold water return temperature T2 is provided at the water inlet end of the three-way regulating valve (35). A third temperature sensor for monitoring the water temperature T3 inside the cold water storage tank (1) is provided inside the cold water storage tank (1). When T3≥T2, the three-way regulating valve (35) is closed so that the cold water only flows through the circulation branch pipe (313) to the cold water supply pipe (311). When T3<T2, the three-way regulating valve (35) adjusts the opening degree according to the cold water supply temperature T1 to control the amount of water flowing through the cold water storage tank (1).

8. The low-temperature intelligent control device for storing bulk grain according to claim 6, wherein: A differential pressure bypass valve (36) for adjusting the differential pressure between the supply and return water is provided between the cold water supply pipe (311) and the cold water return pipe (312). An expansion tank (37) for adjusting the supply water pressure is provided on the cold water supply pipe (311).

9. The low-temperature intelligent control device for storing bulk grain according to claim 1, wherein: The heat exchange circulation pipeline (41) includes a heat exchange outlet pipe (411) and a heat exchange inlet pipe (412). A second circulation pump (43) for driving the hot water body to be exchanged to circulate to the plate heat exchanger (42) is provided on the heat exchange outlet pipe (411). A flow switch (44) for monitoring the water flow state during the heat exchange circulation process is provided on the heat exchange inlet pipe (412).

10. The low-temperature intelligent control device for storing bulk grain according to claim 1, characterized in that: The refrigeration assembly includes a compressor (52), a fin heat exchanger (53), and an electronic expansion valve (54). The compressor (52), the fin heat exchanger (53), and the electronic expansion valve (54) are sequentially connected in series and communicated through the refrigerant circulation pipe (51). A low-pressure sensor (55) for detecting the pressure after the refrigerant evaporates is provided at the outlet end of the plate heat exchanger (42). A high-pressure sensor (56) for detecting the pressure after the refrigerant is compressed is provided at the outlet end of the compressor (52). The controller receives the pressure signals of the low-pressure sensor (55) and the high-pressure sensor (56) to control the operation of the compressor (52).

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