Large space heating air heater based on heat conduction oil heat storage circulation type heat source

Abstract

The application discloses a heat source warm air blower based on a heat conduction oil heat storage circulation type large space heating, relates to the technical field of large scene and space heating equipment such as agricultural greenhouse and industrial plant, and comprises a shell, a fan assembly and an intelligent control box, the fan assembly is movably connected to one side of the inside of the shell, the intelligent control box is installed on the front face of the shell, and the fan assembly and the intelligent control box are connected through lines; the other side of the inside of the shell is provided with a radiator, a heat conduction oil tank, a support and a motor-driven hydraulic pump, the heat conduction oil tank is arranged on the top of the support, the hydraulic pump is installed at the bottom end in the inside of the support, and the radiator and the support are arranged side by side; in the large space heating heat source warm air blower, the heat conduction oil closed circulation heat storage structure is combined with the fan assembly to realize the effects of large heating area, rapid temperature rise and reduced operation cost, that is, compared with the heating energy efficiency ratio of the traditional electric heating equipment, significant energy saving is achieved.

Description

Technical Field

[0001] This invention relates to the technical field of heating equipment for large spaces such as agricultural greenhouses and industrial plants, specifically a large space heating fan based on a heat transfer oil heat storage circulation type. Background Technology

[0002] With the rapid development of modern agriculture and industrialized production, winter heating has become a key aspect of environmental control in large spaces such as planting and breeding greenhouses, factory workshops, and logistics warehouses. Especially in northern regions, where winter temperatures can drop to below -20°C, the lack of effective heating methods will directly lead to reduced crop yields, livestock and poultry freezing to death, or production stagnation, resulting in huge economic losses.

[0003] Currently, large-scale space heating mainly uses traditional electric heating fan heaters or air source heat pumps. Traditional electric heating fan heaters utilize heating wires, PTC ceramic heating elements, or quartz tubes as heating elements, directly blowing cold air over the heating element with a fan to achieve instant heat. They are characterized by simple structure, low initial installation cost, and convenient installation. However, their core drawback lies in extremely low energy efficiency. Under actual air-cooled heat dissipation conditions, the overall heating efficiency ratio (COP) is low, meaning that consuming 1kW of electricity yields less than 1kW of heat. This results in high electricity costs, placing a heavy economic burden on farmers and severely restricting the profitability of agricultural production. Air source heat pumps, on the other hand, utilize a reverse Carnot cycle to draw heat from outdoor air... Air source heat pumps absorb low-grade heat energy from the air, which is then boosted by a compressor and released indoors. They have a high energy efficiency COP and operating costs that are only about 35% of those of electric heating. However, when used in low-temperature environments, the heating efficiency of air source heat pumps drops sharply, and the problem of evaporator frosting becomes prominent, requiring frequent defrosting, which greatly reduces the actual energy efficiency. At the same time, the equipment is extremely expensive and requires professional personnel for installation, vacuuming, and refrigerant charging, making subsequent maintenance complex. This makes it extremely difficult to promote for agricultural greenhouses where costs are sensitive and the operating environment is harsh. In addition, air source heat pumps require outdoor heat exchangers, which limits the installation scenarios. In greenhouse settings, they often face additional problems such as land occupation and wind, snow, and frost damage, making them unsuitable for agricultural planting and breeding greenhouses.

[0004] As a result, there are many shortcomings in the existing technology. Electric heating fan heaters are affordable to buy but not to use, while air source heat pumps are affordable to use but not to buy and are prone to improper maintenance. Neither of these can simultaneously meet the complex needs of low initial installation, low operating costs, large-area rapid heating, low-temperature stability, and installation scenarios suitable for agricultural greenhouses.

[0005] Therefore, there is an urgent need to provide large-scale space heating fan heaters based on thermal oil storage circulation, which can achieve initial installation costs close to those of electric heating, operating costs close to those of heat pumps, large heating area, and stable low-temperature performance, in order to fill the market gap. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a large-scale space heating fan based on a thermal oil storage circulation heat source. It utilizes a closed-loop thermal oil storage structure that prevents solidification at -50℃, and an intelligent control box integrating constant temperature, timing, delayed air delivery, overheat protection, phase sequence protection, remote control, and optional remote control functions. This solves the problems mentioned in the background art, such as high operating costs of electric heating, high initial installation costs of air source heat pumps with low-temperature heating attenuation, and short effective air delivery distance and inability to rapidly heat large areas with existing fan heaters.

[0007] (II) Technical Solution To achieve the above objectives, the present invention is implemented through the following technical solution: a large-scale space heating fan based on thermal oil storage circulation, comprising a shell, a fan assembly and a smart control box, wherein the fan assembly is movably connected to one side inside the shell, the smart control box is installed on the front of the shell, and the fan assembly and the smart control box are connected by a circuit. On the other side inside the outer casing, there is a radiator, a heat transfer oil tank, a bracket, and a motor-driven hydraulic pump used only to drive the circulation of the heat transfer oil. The heat transfer oil tank is mounted on top of the bracket, and the hydraulic pump is installed at the bottom inside the bracket. That is, the hydraulic pump circulates the heat transfer oil stored in the heat transfer oil tank within the radiator to increase the heating area and improve the heating rate. The radiator and the bracket are arranged side by side. An air-gathering vent is provided on the side of the housing and at one end of the fan assembly; The heat transfer oil tank and the hydraulic pump are each connected to the intelligent control box via their respective circuits. The intelligent control box controls the synchronous operation of the hydraulic pump and the fan assembly, that is, when the hydraulic pump starts to drive the heat transfer oil circulation, the fan assembly starts to deliver air synchronously.

[0008] Furthermore, the structure of the radiator includes heat dissipation fins, with multiple sets of copper heat dissipation pipes arranged on the front side of the heat dissipation fins, and an oil pipe interface containing a sealing plug and a pressure relief valve arranged at the top of the back side of the heat dissipation fins; the heat dissipation fins are connected to the intelligent control box via wiring. The heat transfer oil tank structure includes a tank body, inside which is installed an electric heating tube for heating the heat transfer oil to improve heat conversion efficiency and heat storage duration. The upper surface of the tank body is provided with an oil delivery port and an oil storage port for injecting heat transfer oil. The oil delivery port and the oil pipe interface are connected by a stainless steel or PTFE pipe flange.

[0009] Furthermore, the structure of the fan assembly includes a dual-inlet centrifugal fan, and the port of the dual-inlet centrifugal fan is provided with an air outlet; the air concentrator is movably sleeved on the outside of the air outlet.

[0010] Furthermore, the structure of the outer shell includes a frame, a detachable side frame on the other side of the frame, a top plate on the upper surface of the frame, a mezzanine inside the frame, a back plate on the front of the frame, and side plates on the sides of the frame; the side plates are movably connected to the air vent.

[0011] Furthermore, the interior of the heat transfer oil tank is filled with synthetic heat transfer oil that does not solidify at -50°C, and is heated by an electric heating tube to form a closed-loop circulation circuit with the radiator, hydraulic pump and connecting pipes.

[0012] Furthermore, the rated power range of the electric heating element is 30-80kW; The radiator has a heating capacity of 116-181kW, and the outlet temperature of the radiator can reach 60-75℃ when it is in steady state. Since the heat transfer oil has a heat storage function, compared with the direct electric heating fan, this equipment can reduce the actual power-on time of the electric heating tube by 30%-50% through heat transfer oil heat storage and linkage control, achieving significant energy saving under the same heating effect. The air volume of the fan assembly ranges from 6500 to 12000 m³ / h, and the air pressure ranges from 580 to 660 Pa. The effective air delivery distance of the air concentrator is 70-120 meters.

[0013] Furthermore, the heat dissipation fins are made of aluminum alloy fins arranged in a wavy or V-shaped pattern, with a thickness of 0.3-0.6 mm and a spacing of 2-5 mm. The copper heat sink is a U-shaped copper oil pipe that is evenly wound around the heat sink fins, with a wall thickness of 0.5-1.0 mm and a diameter of 20-40 mm.

[0014] Furthermore, the intelligent control box integrates an intelligent control system, which includes: The main control module is used to receive temperature sensor signals and output execution commands; The temperature acquisition module is electrically connected to the main control module and is used to monitor the ambient temperature in real time. The constant temperature control module is electrically connected to the main control module and is used to control the start and stop of the hydraulic pump and the speed of the fan assembly based on the difference between the set temperature and the measured temperature. The timer module is used to preset the start-up, shutdown, and operation periods of the large-space heating source fan heater; A delayed air supply module is connected between the main control module and the fan assembly. It is used to control the fan assembly to continue running for a preset time to dissipate residual heat after the electric heating tube stops heating. The remote control signal receiving module is used to receive external remote control commands and transmit them to the main control module; An overheat protection module is connected between the main control module and the electric heating element. When the temperature of the heat transfer oil or the air outlet temperature exceeds the safety threshold, the power supply to the electric heating element is cut off. The phase sequence protection module is connected to the power supply input terminal and is used to detect whether the phase sequence of the three-phase power supply is correct, and to prevent the start of the large space heating source heater when the phase sequence is incorrect; The digital display module is used to display the current temperature, set temperature, and operating status in real time. The wind speed adjustment module is used to receive instructions from the main control module and adjust the speed range of the fan assembly.

[0015] Furthermore, the intelligent control system also includes any one of the following wireless communication modules—GPRS, Wi-Fi, or 4G—that is electrically connected to the main control module, for remote monitoring and control.

[0016] Furthermore, the preset time range for the delayed air supply module is 30-120 seconds.

[0017] (III) Beneficial Effects This invention provides a large-scale space heating fan based on a thermal oil storage and circulation heat source. It has the following beneficial effects: This large-scale space heating heat source fan heater achieves the effects of large heating area, fast temperature rise and reduced operating costs through a closed-loop heat storage structure of heat transfer oil combined with fan components. It is significantly more energy-efficient than traditional electric heating equipment in terms of heating energy efficiency ratio, and still has an advantage in heating energy efficiency ratio in low-temperature environments compared with air source heat pumps. Moreover, it does not require complex components such as compressors, four-way valves, expansion valves, and outdoor heat exchangers. The initial installation cost of this equipment is low, and it can be directly connected to three-phase power. Installation does not require professional maintenance. The heat transfer oil used in the tank is a synthetic heat transfer oil that does not solidify at -50℃, which eliminates freezing, degradation, and defrosting issues in the extreme low-temperature environment of northern winters. Its reliability is far superior to that of air source heat pumps, achieving stable low-temperature performance. Moreover, the heat transfer oil has the characteristics of not coking or deteriorating, so it does not need to be replaced during application and can be used for a long time. Furthermore, the intelligent control box integrates constant temperature, timer, delayed air supply, overheat protection, phase sequence protection, remote control, and optional remote control functions, realizing intelligent control for unattended automated operation and extending the equipment's lifespan. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the rear view of the large-scale space heating heat source fan of the present invention; Figure 2 This is a front view structural schematic diagram of the large-scale space heating heat source fan of the present invention; Figure 3 This is a longitudinal exploded structural diagram of the large-scale space heating heat source fan of the present invention; Figure 4 This is a schematic diagram of the horizontal exploded structure of the large-scale space heating heat source fan of the present invention; Figure 5 This is a schematic diagram of the heat sink structure of the present invention; Figure 6 This is a schematic diagram of the thermal oil tank structure of the present invention; Figure 7 This is a block diagram of the integrated intelligent control system module inside the intelligent control box of the present invention.

[0019] The attached figures are labeled as follows: 1. Outer shell; 11. Frame; 12. Side frame; 13. Top plate; 14. Mezzanine; 15. Back plate; 16. Side plate; 2. Fan assembly; 21. Dual-inlet centrifugal fan; 22. Air outlet; 1. Smart control box; 2. Radiator; 41. Heat dissipation fins; 42. Copper heat dissipation pipes; 43. Oil pipe connectors; 1. Heat transfer oil tank; 51. Tank body; 52. Heating element; 53. Oil inlet; 54. Oil storage port 2. Bracket; 1. Hydraulic pump; 2. Air inlet. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 Please see Figure 1-2 The present invention provides a large-scale space heating heat source fan based on heat transfer oil heat storage circulation, including a shell 1 made of 2.0mm thick cold-rolled steel plate bent and welded and coated with anti-rust paint, a fan assembly 2 and a smart control box 3, wherein the fan assembly 2 is movably connected to one side inside the shell 1, the smart control box 3 is installed on the front of the shell 1, and the fan assembly 2 and the smart control box 3 are connected by a line. On the other side inside the outer casing 1, there is a radiator 4, a heat transfer oil tank 5, a bracket 6, and a motor-driven hydraulic pump 7 used only to drive the circulation of heat transfer oil. The heat transfer oil tank 5 is mounted on the top of the bracket 6, and the hydraulic pump 7 is installed at the bottom inside the bracket 6. The radiator 4 and the bracket 6 are arranged side by side. An air-gathering port 8 is provided on the side of the outer casing 1 and at one end of the fan assembly 2; The heat transfer oil tank 5 and the hydraulic pump 7 are each connected to the intelligent control box 3 via their respective circuits; The intelligent control box 3 controls the hydraulic pump 7 and the fan assembly 2 to work synchronously. That is, when the hydraulic pump 7 starts to drive the heat transfer oil circulation, the fan assembly 2 starts to deliver air synchronously.

[0022] As a further improvement, the rated power range of the electric heating element 52 is 30-80kW; The heating capacity of the radiator 4 is 116-181kW, and the outlet temperature of the radiator 4 can reach 60-75℃ when it is working in steady state. The air volume of fan assembly 2 ranges from 6500 to 12000 m³ / h, and the air pressure ranges from 580 to 660 Pa. The effective air delivery distance of the air concentrator 8 ranges from 70 to 120 meters.

[0023] The working principle and function are explained in supplementary explanation. In this embodiment 1, the equipment is placed at one end of a greenhouse where the temperature is low in winter. The outer shell 1 supports all internal components. The fan assembly 2 is fixed inside the outer shell 1 on one side. The air concentrator 8 is installed on the side of the outer shell 1 and connects to the air outlet of the fan assembly 2. The radiator 4 and the bracket 6 are fixed side by side on the other side. The heat transfer oil tank 5 is mounted on top of the bracket 6. The hydraulic pump 7 is installed at the bottom of the bracket 6. All electrical components are connected to the intelligent control box 3 through wiring. The electric heating tube in the heat transfer oil tank 5 is responsible for converting electrical energy into heat energy and storing it in the heat transfer oil. The hydraulic pump 7 is only responsible for driving the high-temperature heat transfer oil to circulate in the closed system of the radiator 4. This reduces heat loss and lays the foundation for energy saving. Because the heat transfer oil has a high specific heat capacity and excellent heat storage characteristics, it can achieve the same power consumption. The system stores more heat and maintains stable heat release for a longer period of time. When the intelligent control box 3 issues a start command, the hydraulic pump 7 drives the high-temperature heat transfer oil from the heat transfer oil tank 5 to the radiator 4. At the same time, the fan assembly 2 starts synchronously, drawing in cold air and blowing it across the surface of the radiator 4. After absorbing heat, the air becomes hot air, which is then gathered through the air concentrator 8 and sent out over a long distance, solving the problem of short air delivery distance in traditional heaters. After the heat transfer oil releases heat in the radiator 4, it returns to the heat transfer oil tank 5 through the pipeline for reheating. As the control center, the intelligent control box 3 can control the heating power of the electric heating tube, the start and stop of the hydraulic pump 7, and the speed of the fan assembly 2 according to the temperature signal, and ensure that the hydraulic pump 7 and the fan assembly 2 always maintain a synchronous working state, avoiding energy waste such as "circulation without air delivery" or "air delivery without circulation".

[0024] Example 2 Please see Figure 3-4 This invention provides a large-scale space heating fan based on thermal oil storage and circulation. This embodiment further discloses the outer shell 1 and fan assembly 2 in embodiment 1. The structure of the outer shell 1 includes a frame 11, a detachable side frame 12 on the other side of the frame 11, a top plate 13 on the upper surface of the frame 11, a mezzanine 14 inside the frame 11, a back plate 15 on the front of the frame 11, and a side plate 16 on the side of the frame 11; the side plate 16 is movably connected to the air inlet 8.

[0025] As a further improvement, the structure of the fan assembly 2 includes a dual-inlet centrifugal fan 21, with an air outlet 22 provided at the port of the dual-inlet centrifugal fan 21; and an air concentrator 8 movably sleeved on the outside of the air outlet 22.

[0026] The working principle and function of the dual-inlet centrifugal fan 21 in this embodiment 2 are explained in detail below. The dual-inlet centrifugal fan 21 is fixed inside the outer casing 1 on one side. The air outlet 22 is connected to the air collector 8 and secured with clamps or screws. It can be disassembled for cleaning or replacement. The dual-inlet centrifugal fan 21 draws air from both sides simultaneously, resulting in a large air volume and relatively low noise. The airflow is accelerated by the fan and discharged from the air outlet 22, meeting the heating needs of a large area. The air collector 8 is fitted onto the outside of the air outlet 22, forming a high-pressure jet that pushes hot air a long distance. The frame 11 serves as a load-bearing skeleton, and the detachable side frame 12 facilitates internal maintenance and cleaning, reducing maintenance costs. The start-up, shutdown, and speed of the dual-inlet centrifugal fan 21 are completely controlled by the intelligent control box 3 and synchronized with the hydraulic pump 7. When the hydraulic pump 7 drives the heat transfer oil circulation, the dual-inlet centrifugal fan 21 operates synchronously. When the hydraulic pump 7 stops, the fan enters a delayed air delivery mode to ensure full utilization of residual heat and safe cooling of the equipment.

[0027] Example 3 Please see Figure 5-6 This invention provides a large-scale space heating fan based on a heat transfer oil storage circulation type. This embodiment further discloses the radiator 4 and heat transfer oil tank 5 in embodiment 1. The structure of the radiator 4 includes heat dissipation fins 41. Multiple sets of copper heat dissipation pipes 42 are provided on the front side of the heat dissipation fins 41. An oil pipe interface 43 containing a sealing plug and a pressure relief valve is provided at the top of the back side of the heat dissipation fins 41. The heat dissipation fins 41 are connected to the intelligent control box 3 through a circuit. The structure of the heat transfer oil tank 5 includes a tank body 51, inside which is installed an electric heating tube 52 for heating the heat transfer oil to improve heat conversion efficiency and heat storage duration. The upper surface of the tank body 51 is provided with an oil delivery port 53 and an oil storage port 54 for injecting heat transfer oil. The oil delivery port 53 and the oil pipe interface 43 are connected by a stainless steel or PTFE pipe flange.

[0028] As a further disclosure, the interior of the heat transfer oil tank 5 is filled with synthetic heat transfer oil that does not solidify at -50℃. It is heated by an electric heating tube 52 and forms a closed loop with the radiator 4, hydraulic pump 7 and connecting pipes. That is, after the electric heating tube is energized, it heats the heat transfer oil. The high-temperature heat transfer oil flows through the radiator 4 under the drive of the hydraulic pump 7 to release heat, and then returns to the heat transfer oil tank 5 for reheating. This achieves stable operation in a low-temperature environment of -50℃, solves the problem of low-temperature attenuation of air source heat pumps, and the closed loop reduces heat loss and medium consumption, resulting in significant energy saving.

[0029] As a further disclosure, the heat dissipation fins 41 are made of aluminum alloy fins arranged in a wave-shaped or V-shaped pattern, with a thickness of 0.3-0.6 mm and a spacing of 2-5 mm. The wave-shaped or V-shaped fins increase turbulence, disrupt the air boundary layer, and improve the convective heat transfer coefficient. The narrow spacing of 2-5 mm is used to increase the heat dissipation area per unit volume. The copper heat pipe 42 is a copper oil pipe with U-shaped meandering and uniformly wound around the heat dissipation fins 41. Its wall thickness is 0.5-1.0mm and its diameter is 20-40mm. The U-shaped meandering copper pipe extends the flow of heat transfer oil in the radiator, increases the heat exchange time and heat exchange area, and the high thermal conductivity of copper, together with the aluminum alloy fins, forms a highly efficient heat conduction.

[0030] The working principle and function are explained in the supplementary explanation. In this embodiment 3, the heat dissipation fins 41 are made of aluminum alloy, and the copper heat dissipation tubes 42 are U-shaped and wound between the fins. The oil pipe interface 43 is welded to the top of the back of the radiator 4. The oil inlet 53 of the heat transfer oil tank 5 is connected to the oil pipe interface 43 through a flange, a high-temperature gasket, and an oil pipe. The high-temperature heat transfer oil enters the radiator 4 from the heat transfer oil tank 5 through the oil inlet 53. When it flows through the copper heat dissipation tubes 42, heat is transferred to the heat dissipation fins 41. The fins exchange heat with the air at a large contact surface, rapidly heating the air. The sealing plug of the oil pipe interface 43 prevents oil leakage, and the pressure relief valve prevents the system pressure from becoming too high. The stainless steel or PTFE pipes have high temperature resistance, corrosion resistance, and low friction characteristics, ensuring long service life. The sealed circulation system significantly improves heat exchange efficiency through the combination of heat dissipation fins and copper tubes designed in this application. The oil pipe interface 43 of the sealing plug and pressure relief valve and the oil supply port 53 ensure the safe operation of the system, prevent oil leakage and overpressure, adapt to long-term continuous working environment, and the closed circulation loop means that the heat transfer oil does not need to be replaced throughout its entire life cycle. When the hydraulic pump 7 is started, it drives the high-temperature heat transfer oil from the tank 51 through the oil supply port 53 into the radiator 4. When it flows through the copper heat dissipation tube 42, the heat is transferred to the heat dissipation fins 41 through the tube wall. The fins form a large contact surface with the air for heat exchange, which quickly heats up the air. After releasing the heat, the heat transfer oil returns to the heat transfer oil tank 5 through the oil pipe interface 43 and pipeline, and is reheated by the electric heating tube. The heat loss is minimal.

[0031] Example 4 Please see Figure 7This invention provides a large-scale space heating fan based on a thermal oil storage circulation heat source. This embodiment further discloses the intelligent control box 3 in Embodiment 1. The intelligent control box 3 integrates an intelligent control system, which includes: The main control module (MCU) is used to receive temperature sensor signals and output execution instructions. The temperature acquisition module uses two PT100 platinum resistance thermometers to be electrically connected to the main control module for real-time monitoring of ambient temperature. The constant temperature control module is electrically connected to the main control module and uses a PID algorithm to control the start and stop of the hydraulic pump 7 and the speed of the fan assembly 2 based on the difference between the set temperature and the measured temperature. Specifically, heating is started when the ambient temperature is <25℃ (set value); full power operation is performed when the difference between the set temperature and the measured temperature is >3℃; and low-frequency maintenance or shutdown is entered when the difference between the set temperature and the measured temperature is ≤1℃. This achieves precise temperature control of ±1℃, avoids overheating, and increases energy-saving effect. The timer module is used to preset the start-up, shutdown, and operation periods of the large-space heating source fan heater; The delayed air supply module is connected between the main control module and the fan assembly 2. It is used to control the fan assembly 2 to continue running for a preset time after the electric heating tube 52 stops heating in order to dissipate residual heat. The delayed air supply prevents local overheating and extends the life of the radiator 4 and the fan assembly 2. The remote control signal receiving module is used to receive external remote control commands and transmit them to the main control module; The overheat protection module is connected between the main control module and the electric heating tube 52. When the temperature of the heat transfer oil or the air outlet temperature exceeds the safety threshold, i.e., the temperature of the heat transfer oil > 95℃ or the temperature of the air outlet > 85℃, the power supply to the electric heating tube 52 is cut off to ensure the safe operation of the equipment and prevent it from burning out. The phase sequence protection module is connected to the power input terminal and uses an XJ3-G type phase sequence relay to detect whether the phase sequence of the three-phase power supply is correct. When the phase sequence is incorrect, it prevents the start of the large space heating source heater, ensuring the safe operation of the equipment and preventing it from burning out. The digital display module uses LED digital tubes to display the current temperature, set temperature, and operating status in real time; The wind speed adjustment module is used to receive instructions from the main control module and adjust the speed range of the fan assembly 2.

[0032] As a further disclosure, the intelligent control system also includes any one of the following wireless communication modules—GPRS, Wi-Fi, or 4G—that is electrically connected to the main control module for remote monitoring and control.

[0033] As a further disclosure, the preset time range of the delayed air supply module is 30-120 seconds. This is used to prevent the accumulation of residual heat from causing aging or melting of internal plastic parts and wiring, and to continue heating by utilizing residual heat, thereby improving thermal energy utilization and avoiding thermal shock deformation caused by sudden fan shutdown, thus extending the equipment's lifespan.

[0034] The working principle and function of this embodiment 4 are further explained below. All modules are integrated onto a single PCB and installed within the intelligent control box 3. The intelligent control system within the box 3 collects the ambient temperature in real time and compares it with the target temperature value set by the user via remote control or panel. When the control system detects that the current greenhouse ambient temperature is lower than the set threshold, the main control module first activates the electric heating element in the heat transfer oil tank 5 to heat the heat transfer oil. After a delay of several seconds, it simultaneously activates the motor-driven hydraulic pump 7 and the fan assembly 2 to drive the heat transfer oil to flow at high speed in a closed circulation loop. The high-temperature heat transfer oil flows through the copper heat dissipation pipe 42 to the surface of the heat dissipation fins 41. The fan assembly 2 draws in cold air and forces it across the heat dissipation fins 41, resulting in efficient heat exchange between the air and the heat transfer oil. The cold air is rapidly heated and then discharged through the air vent 8. A high-speed hot air curtain of 70-80 meters is formed. The temperature acquisition module monitors the temperature in real time. When the greenhouse temperature approaches the set value, the electric heating tube stops heating, but the hydraulic pump and fan continue to run at low speed to use the waste heat of the heat transfer oil for heating, which greatly reduces the power input. After the set temperature is reached, it automatically enters constant temperature low power operation or stops. When the timed shutdown time or remote shutdown is reached, the overheat protection module and the main control module work together to first cut off the electric heating tube, but the hydraulic pump and fan continue to run at full speed for forced heat dissipation. That is, the delayed air supply module continues to run the dual air intake centrifugal fan 21 for 30-120 seconds until the surface temperature of the radiator 4 drops to a safe range, and then the fan is turned off. This avoids the accumulation of waste heat and damage to the equipment. When the phase sequence protection is triggered, no component is allowed to start to prevent the hydraulic pump from reversing and causing damage.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-scale space heating fan based on thermal oil storage and circulation, characterized in that: It includes a housing (1), a fan assembly (2) and a smart control box (3), wherein the fan assembly (2) is movably connected to one side inside the housing (1), and the smart control box (3) is installed on the front of the housing (1). The fan assembly (2) and the smart control box (3) are connected by a line. On the other side inside the outer casing (1), there is a radiator (4), a heat transfer oil tank (5), a bracket (6), and a motor-driven hydraulic pump (7) used only to drive the circulation of heat transfer oil. The heat transfer oil tank (5) is mounted on the top of the bracket (6), and the hydraulic pump (7) is installed at the bottom inside the bracket (6). That is, the hydraulic pump (7) circulates the heat transfer oil stored in the heat transfer oil tank (5) in the radiator (4). The radiator (4) and the bracket (6) are arranged side by side. An air-gathering port (8) is provided on the side of the outer casing (1) and at one end of the fan assembly (2); The heat transfer oil tank (5) and the hydraulic pump (7) are respectively connected to the intelligent control box (3) through their respective lines; The intelligent control box (3) controls the hydraulic pump (7) and the fan assembly (2) to work synchronously. That is, when the hydraulic pump (7) starts to drive the heat transfer oil circulation, the fan assembly (2) starts to blow air synchronously.

2. The large-scale space heating fan based on thermal oil storage and circulation as described in claim 1, characterized in that: The structure of the radiator (4) includes heat dissipation fins (41), and multiple sets of copper heat dissipation pipes (42) are provided on the front side of the heat dissipation fins (41). An oil pipe interface (43) containing a sealing plug and a pressure relief valve is provided at the top of the back side of the heat dissipation fins (41). The structure of the heat transfer oil tank (5) includes a tank body (51), and an electric heating tube (52) for heating the heat transfer oil is provided inside the tank body (51). The upper surface of the tank body (51) is provided with an oil delivery port (53) and an oil storage port (54) for injecting heat transfer oil. The oil delivery port (53) and the oil pipe interface (43) are connected by a stainless steel or PTFE pipe flange.

3. The large-scale space heating fan based on thermal oil storage and circulation as described in claim 2, characterized in that: The structure of the fan assembly (2) includes a dual-inlet centrifugal fan (21), and the port of the dual-inlet centrifugal fan (21) is provided with an air outlet (22); the air concentrator (8) is movably sleeved on the outside of the air outlet (22).

4. The large-scale space heating fan based on thermal oil storage and circulation as described in claim 3, characterized in that: The structure of the outer shell (1) includes a frame (11), a detachable side frame (12) is provided on the other side of the frame (11), a top plate (13) is provided on the upper surface of the frame (11), a mezzanine (14) is provided inside the frame (11), a back plate (15) is provided on the front of the frame (11), and a side plate (16) is provided on the side of the frame (11); the side plate (16) is movably connected to the air vent (8).

5. The large-scale space heating fan based on thermal oil storage and circulation as described in claim 4, characterized in that: The interior of the heat transfer oil tank (5) is filled with synthetic heat transfer oil that does not solidify at -50°C. It is heated by the electric heating tube (52) and forms a closed loop with the radiator (4), the hydraulic pump (7) and the connecting pipe.

6. The large-scale space heating fan based on thermal oil storage and circulation as described in claim 4, characterized in that: The rated power range of the electric heating tube (52) is 30-80kW; The heating capacity of the radiator (4) is 116-181kW, and the outlet temperature of the radiator (4) can reach 60-75℃ when it is in steady state operation. The air volume of the fan assembly (2) is 6500-12000 m³ / h and the air pressure is 580-660 Pa. The effective air delivery distance of the air collection port (8) is 70-120 meters.

7. The large-scale space heating fan based on thermal oil storage and circulation as described in claim 4, characterized in that: The heat dissipation fins (41) are made of aluminum alloy fins arranged in a wave-like or V-shaped pattern, with a thickness of 0.3-0.6 mm and a spacing of 2-5 mm. The copper heat sink (42) is a copper oil pipe that is U-shaped and evenly wound around the heat sink fins (41), with a wall thickness of 0.5-1.0 mm and a diameter of 20-40 mm.

8. The large-scale space heating fan based on thermal oil storage and circulation as described in claim 4, characterized in that: The intelligent control box (3) integrates an intelligent control system, which includes: The main control module is used to receive temperature sensor signals and output execution commands; The temperature acquisition module is electrically connected to the main control module and is used to monitor the ambient temperature in real time. The constant temperature control module is electrically connected to the main control module and is used to control the start and stop of the hydraulic pump (7) and the speed of the fan assembly (2) according to the difference between the set temperature and the measured temperature. The timer module is used to preset the start-up, shutdown, and operation periods of the large-space heating source fan heater; The delayed air supply module is connected between the main control module and the fan assembly (2) and is used to control the fan assembly (2) to continue running for a preset time to dissipate residual heat after the electric heating tube (52) stops heating. The remote control signal receiving module is used to receive external remote control commands and transmit them to the main control module; The overheat protection module is connected between the main control module and the electric heating tube (52). When the temperature of the heat transfer oil or the temperature of the air outlet exceeds the safety threshold, the power supply to the electric heating tube (52) is cut off. The phase sequence protection module is connected to the power supply input terminal and is used to detect whether the phase sequence of the three-phase power supply is correct, and to prevent the start of the large space heating source heater when the phase sequence is incorrect; The digital display module is used to display the current temperature, set temperature, and operating status in real time. The wind speed adjustment module is used to receive instructions from the main control module and adjust the speed range of the fan assembly (2).

9. The large-scale space heating fan based on thermal oil storage and circulation as described in claim 8, characterized in that: The intelligent control system also includes any one of the following wireless communication modules that is electrically connected to the main control module: GPRS, Wi-Fi, and 4G, for remote monitoring and control.

10. The large-scale space heating fan based on thermal oil storage and circulation as described in claim 8, characterized in that: The preset time range for the delayed air supply module is 30-120 seconds.

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