Cooling air system under extreme weather conditions

Abstract

The utility model discloses an extreme climate condition cooling air system, including screw air compressor host, the side of screw air compressor host is provided with the diesel engine for driving screw air compressor host, and the side away from diesel engine of cooling fan blade is provided with oil cooler, and the side away from screw air compressor host of diesel engine is provided with cooling fan blade, and cooling fan blade is driven through diesel engine, and the air inlet louver is provided between oil cooler and cooling fan blade, and the top of air inlet louver is installed electric actuator. The utility model discloses through the opening degree adjustment of air inlet louver, the air volume of cooling air is controlled, makes this screw air compressor cooling air system suitable for extreme climate condition, reduces oil cooler import and export temperature difference, reduces oil cooler temperature gradient, guarantees the cooler of screw air compressor and the open -air, underground tunneling drilling machine of being equipped with screw air compressor engineering machinery has longer life.

Description

Technical Field

[0001] This utility model relates to the field of threaded rod air compressor technology, and in particular to a cooling air system under extreme climatic conditions. Background Technology

[0002] Screw air compressors powered by diesel engines have been widely used in numerous fields such as mining, road and bridge construction, and water conservancy projects due to their performance advantages. With their reliable quality and high cost-effectiveness, screw air compressors are used efficiently in many mines and factories, with screw compressors as their core equipment, in both hot and cold regions.

[0003] In existing screw air compressors powered by diesel engines, the cooling fan blades are typically mounted on the driven shaft of the diesel engine. When the diesel engine is running at its rated operating speed, the fan blade speed remains constant. This structure makes the air-cooling system significantly inadequate when dealing with different ambient temperature conditions. Especially in extremely cold environments, where the ambient temperature is between -30℃ and -40℃, and in extreme climates with large diurnal temperature variations, the air-cooling system of the screw air compressor often operates based on the highest ambient temperature conditions. In both high-temperature and low-temperature environments, the airflow output by the fan blades remains constant.

[0004] A fixed cooling airflow can fully meet the cooling needs of the machine under high-temperature conditions, ensuring the normal operation of the screw air compressor. However, in extremely cold weather conditions, a fixed cooling airflow can cause a series of serious problems. Due to the extremely low ambient temperature, excessive cooling airflow can lead to over-cooling of the screw compressor oil cooler, resulting in a large temperature difference between the oil inlet and outlet temperatures, and thus a large temperature gradient. This significant temperature stress can easily cause brazing failure of the oil cooler, ultimately leading to oil leakage. This severely affects the normal operation and service life of the screw air compressor, and also causes considerable disruption to the normal operation of other construction machinery such as outdoor and underground drilling rigs that use screw air compressors. Utility Model Content

[0005] The purpose of this invention is to provide a cooling air system for extreme weather conditions. By adjusting the opening of the air inlet louvers, the airflow of the cooling air is controlled, making the screw air compressor cooling air system suitable for extreme weather conditions. This reduces the temperature difference between the inlet and outlet of the oil cooler, reduces the temperature gradient of the oil cooler, and ensures a longer service life for the coolers of the screw air compressor and other engineering machinery such as open-air and underground tunneling drilling rigs equipped with screw air compressors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A cooling air system for extreme climate conditions includes a screw air compressor main unit. A diesel engine for driving the screw air compressor main unit is installed on the side of the screw air compressor main unit. A cooling fan is installed on the side of the diesel engine away from the screw air compressor main unit. An oil cooler is installed on the side of the cooling fan away from the diesel engine. An air inlet louver is installed between the oil cooler and the cooling fan. An electric actuator is installed on the top of the air inlet louver. The air inlet louver consists of a guide vane and a rotating shaft. The rotating shaft is drivenly connected to the output end of the electric actuator. The system also includes a controller and an ambient temperature sensor. The controller is electrically connected to both the electric actuator and the ambient temperature sensor. The controller is used to control the electric actuator to drive the rotating shaft to rotate based on the detection signal from the ambient temperature sensor, thereby adjusting the opening degree of the air inlet louver.

[0008] As a preferred embodiment of this utility model, the cooling fan blades are driven to rotate by the driven shaft of the diesel engine, and the cooling air generated by the cooling fan blades flows sequentially through the air inlet louvers and the oil cooler.

[0009] As a preferred embodiment of this utility model, the electric actuator includes a motor and a reducer. The output shaft of the motor is connected to the rotating shaft through the reducer. The motor is used to receive signals from the controller and drive the rotating shaft to rotate.

[0010] As a further embodiment of this utility model, the guide vanes are evenly distributed along the axial direction of the rotating shaft, and the rotation angle range of the guide vanes is 0°-90°, so as to adjust the ventilation cross-sectional area of ​​the air inlet louvers.

[0011] As a preferred embodiment of this utility model, an oil separator is provided on the side of the screw air compressor main unit, and an exhaust temperature control valve is provided on the side of the oil separator. The lubricating oil in the oil separator flows into the oil cooler through the exhaust temperature control valve, and the cooled lubricating oil returns to the screw air compressor main unit after being collected through the exhaust temperature control valve.

[0012] As a further embodiment of this utility model, when the ambient temperature sensor detects that the ambient temperature is lower than the first threshold, the controller controls the electric actuator to reduce the opening of the air inlet louver; when the ambient temperature is higher than the second threshold, the controller controls the electric actuator to increase the opening of the air inlet louver, wherein the first threshold is less than the second threshold.

[0013] As a further embodiment of this utility model, a sealing strip is provided on the frame of the air inlet louver. The sealing strip is used to block the flow of cooling air when the air inlet louver is closed.

[0014] As a preferred embodiment of this utility model, the oil cooler is a brazed plate heat exchanger, and the oil inlet and outlet of the oil cooler are respectively connected to the oil circuit interface of the exhaust temperature control valve.

[0015] Compared with existing technologies, the cooling air system provided by this utility model under extreme climatic conditions has the following beneficial effects:

[0016] 1. In this utility model, the ambient temperature sensor, electric actuator, and controller constitute an intelligent control system that automatically and precisely adjusts the opening of the air inlet louvers to control the cooling air volume, ensuring stable operation of the screw air compressor. This effectively prevents large inlet and outlet temperature differences and gradients in the oil cooler due to excessive cooling air volume in extremely cold conditions, reducing the risk of brazing failure and oil leakage. It also ensures stable operation of the coolers in the screw air compressor and its associated open-air and underground tunneling drilling rigs, extending their service life, reducing equipment downtime for maintenance, and saving costs. Furthermore, it achieves automated intelligent control, improving system operating accuracy and stability, reducing operational burden, lowering the risk of human error, and enhancing overall performance and safety.

[0017] 2. Precise Adaptation to Extreme Climates: This invention uses an ambient temperature sensor to perceive the external temperature in real time and transmits the temperature signal to the controller. Based on the received temperature signal, the controller sends precise action signals to the electric actuator, which in turn drives the shaft of the air inlet louvers to rotate, causing the guide vanes to adjust their angle, thus achieving multi-angle opening and closing of the air inlet louvers. This intelligent control method allows the system to automatically and precisely adjust the opening degree of the air inlet louvers according to different extreme climatic conditions, such as extremely hot or extremely cold environments, thereby effectively controlling the cooling air volume and ensuring stable operation of the screw air compressor in various harsh environments.

[0018] 3. Effectively Reduces Temperature Gradient: In extremely cold weather conditions, traditional cooling air systems, due to their fixed cooling airflow, are prone to overcooling of the oil cooler, resulting in a large inlet-outlet temperature difference and temperature gradient. This system, however, controls the cooling airflow by adjusting the opening of the inlet louvers, preventing excessive cooling airflow in low-temperature environments. This effectively reduces the inlet-outlet temperature difference and temperature gradient of the oil cooler, significantly lowering the risk of brazing failure and oil leakage caused by thermal stress, and improving the reliability and service life of the oil cooler.

[0019] 4. Significantly Extends Equipment Lifespan: Because this system automatically adjusts the cooling airflow based on ambient temperature, it reduces temperature fluctuations and stress damage to the oil cooler, ensuring that the coolers of screw air compressors and associated construction machinery such as open-air and underground tunneling drilling rigs operate in a relatively stable state. This not only helps extend the lifespan of the cooler itself but also reduces downtime due to cooler malfunctions, improving the overall efficiency and reliability of the construction machinery system. This saves users significant maintenance and time costs, resulting in substantial economic and social benefits.

[0020] 5. Achieve Automated Intelligent Control: The ambient temperature sensor, electric actuator, and controller work together to form a complete automated intelligent control system. This system requires no frequent manual intervention and can automatically and in real-time adjust the cooling airflow according to changes in ambient temperature, achieving intelligent management of the cooling air system. This automated control method not only improves the system's operational accuracy and stability but also reduces the workload of operators, lowers the risk of human error, and further enhances the overall performance and safety of the screw air compressor and its associated engineering machinery. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0023] Icon labels:

[0024] 1. Oil cooler; 2. Air inlet louvers; 3. Electric actuator; 4. Cooling fan blades; 5. Diesel engine; 6. Screw air compressor main unit; 7. Controller; 8. Ambient temperature sensor; 9. Oil separator; 10. Exhaust temperature control valve; 201. Guide fan blades; 202. Rotary shaft. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0026] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present invention should be understood according to the specific circumstances.

[0028] See Figure 1 As shown, this utility model embodiment provides a cooling air system for extreme climate conditions, including a screw air compressor main unit 6. A diesel engine 5 for driving the screw air compressor main unit 6 is arranged on the side of the screw air compressor main unit 6. A cooling fan 4 is arranged on the side of the diesel engine 5 away from the screw air compressor main unit 6. An oil cooler 1 is arranged on the side of the cooling fan 4 away from the diesel engine 5. An air inlet louver 2 is arranged between the oil cooler 1 and the cooling fan 4. An electric actuator 3 is installed on the top of the air inlet louver 2. The air inlet louver 2 is composed of a guide fan 201 and a rotating shaft 202. The rotating shaft 202 is connected to the output end of the electric actuator 3. The system also includes a controller 7 and an ambient temperature sensor 8. The controller 7 is electrically connected to the electric actuator 3 and the ambient temperature sensor 8 respectively. The controller 7 is used to control the electric actuator 3 to drive the rotating shaft 202 to rotate according to the detection signal of the ambient temperature sensor 8, so as to adjust the opening of the air inlet louver 2.

[0029] The controller 7 is electrically connected to the ambient temperature sensor 8 and the electric actuator 3, driving the shaft 202 of the air inlet louver 2 to adjust the opening and control the cooling air volume. This enables automated and intelligent adjustment of the cooling air volume, allowing the system to automatically adjust the opening of the air inlet louver 2 according to extreme climates such as extreme cold or heat. This reduces the temperature difference and temperature gradient between the inlet and outlet of the oil cooler 1, avoids brazing failure and oil leakage of the oil cooler 1 due to fixed cooling air volume, and extends the service life of the screw air compressor main unit 6 and the supporting engineering machinery cooler.

[0030] The cooling fan blade 4 is driven to rotate by the driven shaft of the diesel engine 5. The cooling air generated by the cooling fan blade 4 flows sequentially through the air inlet louver 2 and the oil cooler 1. The cooling fan blade 4 is driven by the driven shaft of the diesel engine 5, and the cooling air flows sequentially through the air inlet louver 2 and the oil cooler 1. The cooling fan blade 4 is directly driven by the power of the diesel engine 5, eliminating the need for an additional power source, simplifying the system structure and reducing energy consumption. The cooling air flows along the path of "air inlet louver 2 → oil cooler 1", ensuring that the cooling air effectively acts on the oil cooler 1 to dissipate heat from the lubricating oil.

[0031] The electric actuator 3 includes a motor and a reducer. The output shaft of the motor is connected to the rotating shaft 202 via the reducer. The motor receives signals from the controller 7 and drives the rotating shaft 202 to rotate. The electric actuator 3 includes a motor and a transmission mechanism. It is connected to the rotating shaft 202 via the transmission mechanism and receives signals from the controller 7 to drive the rotating shaft 202. The combination of the motor and the transmission mechanism ensures that the electric actuator 3 drives the rotating shaft 202 stably and reliably, enabling the opening adjustment of the air inlet louvers 2 to accurately respond to the commands of the controller 7, avoiding deviations in cooling airflow control due to drive failure, and improving the stability of system operation.

[0032] The guide vanes 201 are evenly distributed along the axial direction of the rotating shaft 202, and the rotation angle range of the guide vanes 201 is 0°-90° to adjust the ventilation cross-sectional area of ​​the air inlet louvers 2. The evenly distributed guide vanes 201 can precisely change the ventilation area of ​​the air inlet louvers 2 by rotating at multiple angles from 0° to 90°, achieving graded adjustment of the cooling airflow, such as completely closed, partially open, and fully open. This allows the system to adapt to cooling needs under different temperature differences, improving the flexibility of airflow control.

[0033] An oil separator tank 9 is installed on the side of the screw air compressor main unit 6, and an exhaust temperature control valve 10 is installed on the side of the oil separator tank 9. The lubricating oil in the oil separator tank 9 flows into the oil cooler 1 through the exhaust temperature control valve 10. After cooling, the lubricating oil returns to the screw air compressor main unit 6 after being collected by the exhaust temperature control valve 10. The oil separator tank 9 separates the lubricating oil from the oil-air mixture. The exhaust temperature control valve 10 controls the flow rate and temperature of the lubricating oil, so that the lubricating oil returns to the main unit at a suitable temperature after being cooled by the oil cooler 1. This ensures stable circulation of lubricating oil in the screw air compressor main unit 6 and avoids equipment failure due to excessively high or low oil temperatures.

[0034] When the ambient temperature sensor 8 detects that the ambient temperature is below a first threshold, the controller 7 controls the electric actuator 3 to reduce the opening of the air inlet louvers 2; when the ambient temperature is above a second threshold, the controller 7 controls the electric actuator 3 to increase the opening of the air inlet louvers 2. The first threshold is less than the second threshold. By setting a preset temperature threshold, adaptive adjustment of the cooling airflow is achieved. In extremely cold environments, the opening is reduced to prevent excessive cooling airflow from causing overcooling of the oil cooler 1; in high-temperature environments, the opening is increased to ensure sufficient cooling airflow, avoid excessively high oil temperature, and further reduce the risk of stress damage to the oil cooler 1 caused by temperature differences.

[0035] A sealing strip is installed on the frame of the air inlet louver 2. The sealing strip is used to block the flow of cooling air when the air inlet louver 2 is closed. The sealing strip forms a seal when the air inlet louver 2 is closed, preventing extremely cold air from entering the system. This avoids a sudden drop in temperature of the oil cooler 1 due to the intrusion of additional cold air in low-temperature environments, reduces heat loss, and ensures the thermal insulation performance of the system under extremely cold conditions.

[0036] The oil cooler 1 is a brazed plate heat exchanger. The oil inlet and outlet of the oil cooler 1 are connected to the oil circuit interface of the exhaust temperature control valve 10, respectively. The brazed plate heat exchanger has high heat exchange efficiency and can quickly reduce the temperature of the lubricating oil. The design of connecting the oil circuit with the exhaust temperature control valve 10 ensures that the lubricating oil flows through the oil cooler 1 along the set path, thereby achieving precise oil temperature control and improving the heat dissipation efficiency and reliability of the cooling system.

[0037] In this cooling air system under extreme climatic conditions, the ambient temperature sensor 8 can be a single-bus digital temperature sensor, characterized by a wide temperature measurement range. Its measurement range can cover temperature variations under various extreme climates, including high temperatures, extreme cold, low temperatures, and diurnal temperature differences of up to 50°C. Furthermore, it uses a single-bus interface, requiring only a single pin to communicate with the microcontroller, greatly simplifying wiring. In this system, it can be easily connected to the controller 7, efficiently transmitting real-time acquired ambient temperature data to the controller 7. In addition, this sensor is highly accurate, small in size, and has strong anti-interference capabilities, ensuring stable and accurate ambient temperature sensing even in complex environments.

[0038] The controller 7 can be the STM32F103C8T6 model from the STM32 series. The STM32 series is based on the ARM Cortex-M core and features a rich set of peripherals and interfaces. The STM32F103C8T6 model meets the data processing requirements of this system in terms of performance. It has multiple UART, SPI, and I2C interfaces, allowing for easy communication with the ambient temperature sensor 8 and the electric actuator 3. In this system, based on the ambient temperature data transmitted from the DS18B20, it quickly runs the built-in temperature threshold algorithm and promptly sends precise control commands to the electric actuator 3 to drive the shaft 202 of the air inlet louver 2 to rotate, thereby flexibly adjusting the opening degree of the air inlet louver 2 and achieving intelligent control of the cooling airflow. Furthermore, this model has abundant development documentation, facilitating targeted programming and system debugging by developers, and helping to ensure the stable and reliable operation of the entire cooling system.

[0039] The controller receives the temperature signal from the ambient temperature sensor and sends an action signal to the electric actuator. The ambient temperature sensor, electric actuator, and controller together achieve automatic control of the cooling airflow. The preset action parameters within the controller are shown in the table below.

[0040]

[0041] Working principle of this utility model embodiment:

[0042] During system operation, the diesel engine 5 starts working and drives the cooling fan 4 to rotate. The cooling fan 4 performs work on the air, blowing out cooling air. Simultaneously, the ambient temperature sensor 8 senses the external ambient temperature in real time and transmits the temperature signal quickly and accurately to the controller 7. Upon receiving the signal, the controller 7, based on its built-in intelligent algorithm and preset program, sends precise action commands to the electric actuator 3 installed on top of the air inlet louver 2. Upon receiving the command, the electric actuator 3 drives the rotating shaft 202 of the air inlet louver 2. The rotating shaft 202 drives the guide vane 201 to rotate, thereby adjusting the angle of the guide vane 201 and achieving multi-angle opening and closing of the air inlet louver 2. Through this change in opening, the airflow of cooling air entering the oil cooler 1 is precisely adjusted to adapt to different ambient temperature conditions.

[0043] Inside the screw air compressor main unit 6, the oil-gas mixture is compressed in the compression chamber, and the high-temperature, high-pressure oil-gas mixture enters the oil separator 9. The oil separator 9, with its special structure, efficiently separates the oil from the mixture. The separated oil, after precise control by the exhaust temperature control valve 10, flows to the oil cooler 1. In the oil cooler 1, the oil undergoes sufficient heat exchange with the cooling air regulated by the air inlet louvers 2, achieving cooling. The cooled oil then flows again through the manifold of the exhaust temperature control valve 10, and through the connecting pipeline, is reinjected into the screw air compressor main unit 6 at a suitable temperature and flow rate, completing a full oil circulation cooling process. Through the coordinated work of its components, the entire system achieves effective cooling and stable operation of the screw air compressor under extreme climatic conditions.

[0044] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A cooling air system for extreme climate conditions, comprising a screw air compressor main unit (6), characterized in that: A diesel engine (5) for driving the screw air compressor main unit (6) is provided on the side of the screw air compressor main unit (6). A cooling fan (4) is provided on the side of the diesel engine (5) away from the screw air compressor main unit (6). An oil cooler (1) is provided on the side of the cooling fan (4) away from the diesel engine (5). An air inlet louver (2) is provided between the oil cooler (1) and the cooling fan (4). An electric actuator (3) is installed on the top of the air inlet louver (2). The air inlet louver (2) is made of The device consists of a guide vane (201) and a rotating shaft (202), the rotating shaft (202) being connected to the output end of the electric actuator (3); it also includes a controller (7) and an ambient temperature sensor (8), the controller (7) being electrically connected to the electric actuator (3) and the ambient temperature sensor (8) respectively, the controller (7) being used to control the electric actuator (3) to drive the rotating shaft (202) to rotate according to the detection signal of the ambient temperature sensor (8), so as to adjust the opening of the air inlet louver (2).

2. The cooling air system under extreme climatic conditions according to claim 1, characterized in that: The cooling fan blade (4) is driven to rotate by the driven shaft of the diesel engine (5), and the cooling air generated by the cooling fan blade (4) flows through the air inlet louver (2) and the oil cooler (1) in sequence.

3. A cooling air system for extreme climate conditions according to claim 1, characterized in that: The electric actuator (3) includes a motor and a reducer. The output shaft of the motor is connected to the rotating shaft (202) through the reducer. The motor is used to receive signals from the controller (7) and drive the rotating shaft (202) to rotate.

4. A cooling air system for extreme climate conditions according to claim 3, characterized in that: The guide vanes (201) are evenly distributed along the axis of the rotating shaft (202), and the rotation angle of the guide vanes (201) is 0°-90° to adjust the ventilation cross-sectional area of ​​the air inlet louvers (2).

5. A cooling air system for extreme climate conditions according to claim 1, characterized in that: An oil separator (9) is provided on the side of the screw air compressor main unit (6), and an exhaust temperature control valve (10) is provided on the side of the oil separator (9). The lubricating oil in the oil separator (9) flows into the oil cooler (1) through the exhaust temperature control valve (10), and the cooled lubricating oil returns to the screw air compressor main unit (6) after being collected through the exhaust temperature control valve (10).

6. A cooling air system for extreme climate conditions according to claim 5, characterized in that: When the ambient temperature sensor (8) detects that the ambient temperature is lower than the first threshold, the controller (7) controls the electric actuator (3) to reduce the opening of the air inlet louver (2); when the ambient temperature is higher than the second threshold, the controller controls the electric actuator (3) to increase the opening of the air inlet louver (2), wherein the first threshold is less than the second threshold.

7. A cooling air system for extreme climate conditions according to claim 6, characterized in that: A sealing strip is provided on the frame of the air inlet louver (2), which is used to block the flow of cooling air when the air inlet louver (2) is closed.

8. A cooling air system for extreme climate conditions according to any one of claims 5-7, characterized in that: The oil cooler (1) is a brazed plate heat exchanger, and the oil inlet and outlet of the oil cooler (1) are respectively connected to the oil circuit interface of the exhaust temperature control valve (10).

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