A nanomaterial-enhanced variable frequency compressor and its control method

Abstract

This invention discloses a nanomaterial-enhanced variable frequency compressor and its control method, comprising a compression mechanism, an oil separator, a heat dissipation mechanism, a storage tank, and a piping assembly. The compression mechanism includes a compressor body and a first motor, the drive shaft of which is connected to a twin-screw assembly. The oil separator includes a separation tank with a separation valve assembly connected to at least a first pipe and a second pipe. The heat dissipation mechanism includes a heat dissipation shell with several heat dissipation grilles. Compressed air flows through the heat dissipation grilles to dissipate heat, converting high-temperature air into low-temperature air, which is then collected in the storage tank via the piping assembly for storage. Through the coordinated operation of its components, this device achieves a highly efficient, energy-saving, and stable compressed air compression and processing process, broadening the application range of variable frequency compressors.

Description

Technical Field

[0001] This invention relates to the field of air compressor technology, and in particular to a nanomaterial-enhanced variable frequency compressor and its control method. Background Technology

[0002] With the continuous development of industrial production, compressed air has become an indispensable power source and process medium in many industries such as manufacturing, energy, chemicals, and pharmaceuticals. An efficient, energy-saving, and stable supply of compressed air is crucial for ensuring the continuity of production processes and product quality. In modern industry, where automation is increasingly advanced, equipment demands higher and higher standards for the quality and stability of compressed air.

[0003] Existing air compressors typically employ traditional designs and materials, with the compression mechanism, oil separator, and cooling system operating independently, lacking effective coordination and optimization. During compression, significant friction and wear between the screw, rotor, and other components and the compression chamber lead to increased energy loss and reduced compression efficiency. Furthermore, traditional compressor cooling systems are inefficient, failing to effectively lower the temperature of the compressed air, thus affecting air quality and equipment operational stability. Simultaneously, the lack of overall optimization of the compressor's components in current technology hinders efficient energy utilization and stable operational control, limiting the compressor's application in a wider range of fields.

[0004] Therefore, it is necessary to improve the existing air compressor technology to solve the problem. Summary of the Invention

[0005] The purpose of this invention is to provide a nanomaterial-enhanced variable frequency compressor and its control method, thereby solving the above-mentioned technical problems.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A nanomaterial-enhanced variable frequency compressor includes a compression mechanism, an oil separator, a heat dissipation mechanism, a storage tank, and a pipeline assembly. The compression mechanism includes a compressor body and a first motor. The compressor body has a compression chamber for compressing gas. The drive shaft of the first motor is connected to a twin-screw assembly, which is disposed within the compression chamber. The first motor drives the twin-screw assembly to rotate, thereby compressing air and moving it along the pipeline assembly to the oil separator.

[0008] The oil separator includes a separation tank, which is equipped with a separation valve group. The separation valve group is connected to at least a first pipe and a second pipe. The first pipe is connected to the compressor body and is used for oil return. The second pipe is connected to the heat dissipation mechanism and is used to transport the gas after oil separation to the heat dissipation mechanism.

[0009] The heat dissipation mechanism includes a heat dissipation shell with several heat dissipation grilles. Compressed air flows through the heat dissipation grilles to dissipate heat, converting high-temperature air into low-temperature air, and then flows through the pipe assembly into the storage tank for storage.

[0010] Optionally, the twin-screw assembly includes a first screw and a second screw arranged side by side, wherein the first screw is connected to the output shaft of the first motor;

[0011] The first screw and the second screw are respectively provided with helical gears that mesh at 45°.

[0012] Optionally, the first screw includes a screw body and a first helical portion disposed on the screw body. The first helical portion is provided in multiple sets, and the multiple sets of the first helical portions are evenly arranged along the circumferential direction of the screw body.

[0013] The first spiral portion has a spiral portion extending along a spiral line, and each side of the spiral portion is provided with a protruding arc-shaped protrusion.

[0014] The second screw is provided with a second helical part, and an arc-shaped groove matching the first helical part is formed between any two adjacent second helical parts.

[0015] Optionally, the first spiral section, the second spiral section, and the surface of the compression chamber are respectively provided with a nanomaterial coating, wherein the nanomaterial coating is a nano-ceramic coating or a nano-carbon-based coating.

[0016] Optionally, the heat dissipation mechanism is further provided with a heat dissipation fan, which is positioned directly opposite the heat dissipation grille, and the heat dissipation fan is connected to a second motor;

[0017] The centerline of the heat dissipation grille along its length is designated as the first centerline, and the thickness of the heat dissipation grille gradually decreases from the first centerline toward both sides.

[0018] Optionally, the pipeline assembly is provided with a control valve, and a flow sensor is provided at the control valve;

[0019] The heat dissipation mechanism is provided with an air inlet and an air outlet. A first temperature sensor is provided at the air inlet, and a second temperature sensor is provided at the air outlet.

[0020] This invention also provides a control method for a nanomaterial-enhanced variable frequency compressor, applied to control the nanomaterial-enhanced variable frequency compressor described above, the control method comprising:

[0021] Step S1: The flow rate and temperature data of compressed air are collected in real time by the flow sensor and temperature sensor integrated on the variable frequency compressor, and the instantaneous status parameters are obtained based on the operating parameters of the variable frequency compressor.

[0022] Step S2: Based on the thermodynamic and hydrodynamic characteristics of the variable frequency compressor, establish a compressor dynamic model of the variable frequency compressor;

[0023] Step S3: The control unit uses a prediction algorithm, combined with the instantaneous state parameters of the compressor, to perform feedforward prediction of the temperature and flow rate of compressed air, and estimates the future temperature and flow rate change trends.

[0024] Step S4: Based on the predicted temperature and flow rate change trends, the control unit generates a control strategy to adjust the speed of the first motor and the operating parameters of the heat dissipation mechanism in order to pre-adjust the variable frequency compressor.

[0025] Optionally, step S3 specifically includes:

[0026] Step S31, the control unit receives and records the instantaneous state parameters at the current moment, the instantaneous state parameters including:

[0027] The current flow rate and temperature data of the compressed air;

[0028] The current speed of the first motor;

[0029] The current operating parameters of the heat dissipation mechanism;

[0030] The inlet and outlet pressures of the compression mechanism;

[0031] Environmental parameters: ambient temperature;

[0032] Step S32: The control unit analyzes the instantaneous state parameters based on the compressor dynamic model, evaluates the current working state of the variable frequency compressor, and obtains the evaluation result.

[0033] Step S33: The control unit uses a prediction algorithm, combined with the evaluation results, to predict the future trends of compressed air temperature and flow rate.

[0034] Step S34: The control unit outputs the predicted future trends in compressed air temperature and flow rate for use in generating a control strategy, specifically including:

[0035] The prediction results are compared with the preset target parameters to determine the deviation of future predictions;

[0036] Based on the predicted deviation, assess the range of control parameters that need to be adjusted;

[0037] It outputs predicted temperature and flow rate trends to provide a basis for the formulation of control strategies.

[0038] Optionally, step S32 specifically includes:

[0039] Step S321: Calculate the current compressed air generation rate based on the current speed of the first motor and the structural parameters of the compression mechanism;

[0040] Step S322: Analyze the temperature rise during the compression process using the thermodynamic characteristics of the compression mechanism to determine the trend of compressed air temperature change;

[0041] Step S323: Based on the current operating parameters of the heat dissipation mechanism, evaluate its cooling effect on the temperature of compressed air.

[0042] Step S324: Combine environmental parameters to evaluate the impact index of external factors on the operation of the compression mechanism.

[0043] Optionally, step S33 specifically includes:

[0044] Step S331: Based on the current compressed air flow rate data and the current rotational speed of the first motor, predict the future flow rate trend of the compressed air.

[0045] Step S332: Based on the compressor dynamic model, the temperature change trend of compressed air in the future is predicted by combining the heat generation during the compression process and the cooling effect of the heat dissipation mechanism.

[0046] Step S333: Based on the thermodynamic and hydrodynamic characteristics of the compression mechanism and the heat dissipation system, determine the lag time T and ∆t, and correct the predicted temperature and flow data to the future time t1=t+T+∆t.

[0047] Step S334: Calculate the rate of change of temperature and flow rate ∆T and ∆Q based on the corrected future temperature and flow rate data and the current temperature and flow rate data;

[0048] Step S335: Determine the upward or downward trend of temperature and flow rate based on the signs of ∆T and ∆Q.

[0049] Compared with existing technologies, this invention has the following advantages: During operation, air is first drawn into the compression chamber of the compressor body. The first motor drives the twin-screw assembly to rotate at high speed, compressing the air. The high-temperature, high-pressure air generated by compression enters the oil separator through the pipeline assembly. The oil separator separates oil mist and impurities from the air. The separated oil flows back to the compressor body through the first pipe, achieving recycling. The clean compressed air is transported to the heat dissipation mechanism through the second pipe, where heat exchange occurs in the heat dissipation grid, and the temperature is reduced. Finally, the cooled low-temperature compressed air enters the storage tank through the pipeline assembly for storage or supply to subsequent equipment. Through the coordinated work of its components, this equipment achieves a highly efficient, energy-saving, and stable compressed air compression and processing process, broadening the application range of variable frequency compressors. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0052] Figure 1 This is a schematic diagram of the overall structure of the nanomaterial-enhanced variable frequency compressor in this embodiment.

[0053] Figure 2 This is a schematic diagram of the heat dissipation mechanism and the compression mechanism of the nanomaterial-enhanced variable frequency compressor in this embodiment.

[0054] Figure 3 This is a schematic diagram of the main structure of the nanomaterial-enhanced variable frequency compressor in this embodiment.

[0055] Figure 4 This is a schematic diagram of the internal structure of the compression mechanism of the nanomaterial-enhanced variable frequency compressor in this embodiment.

[0056] Figure 5 This is a schematic diagram of the first screw of the nanomaterial-enhanced variable frequency compressor in this embodiment.

[0057] Illustration: Compression mechanism 10, oil separator 20, heat dissipation mechanism 30, storage tank 40, pipeline assembly 50, compressor body 11, first motor 12, twin screw assembly 13, separator tank 21, separator valve group 22, first pipe body 23, second pipe body 24, heat dissipation shell 31, heat dissipation grille 32, first screw 131, second screw 132, helical gear 133, screw body 1311, first helical part 1312, spiral part 1313, arc-shaped protrusion 1314, cooling fan 33, second motor 34, control valve 51. Detailed Implementation

[0058] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0059] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0060] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0061] Example 1:

[0062] Combination Figures 1 to 5 As shown, this embodiment of the invention provides a nanomaterial-enhanced variable frequency compressor, including a compression mechanism 10, an oil separator 20, a heat dissipation mechanism 30, a storage tank 40, and a pipeline assembly 50; the compression mechanism 10 includes a compressor body 11 and a first motor 12. The compressor body 11 has a compression chamber for compressing gas. The drive shaft of the first motor 12 is connected to a twin-screw assembly 13. The twin-screw assembly 13 is disposed in the compression chamber. The first motor 12 is used to drive the twin-screw assembly 13 to rotate, so that compressed air moves along the pipeline assembly 50 to the oil separator 20.

[0063] The oil separator 20 includes a separation tank 21, which is equipped with a separation valve assembly 22. The separation valve assembly 22 is connected to at least a first pipe 23 and a second pipe 24. The first pipe 23 is connected to the compressor body 11 and is used for oil return, realizing the recycling of lubricating oil and reducing operating costs. The second pipe 24 is connected to the heat dissipation mechanism 30 and is used to transport the gas after oil separation to the heat dissipation mechanism 30 for further processing.

[0064] The heat dissipation mechanism 30 includes a heat dissipation housing 31, on which a plurality of heat dissipation grilles 32 are provided. Compressed air flows through the heat dissipation grilles 32 to dissipate heat, converting high-temperature air into low-temperature air, and then flows through the pipe assembly 50 into the storage tank 40 for storage.

[0065] The working principle of this invention is as follows: During operation, air is first drawn into the compression chamber of the compressor body 11. The first motor 12 drives the twin-screw assembly 13 to rotate at high speed, compressing the air. The high-temperature and high-pressure air generated by compression enters the oil separator 20 through the pipeline assembly 50. The oil separator 20 separates the oil mist and impurities in the air. The separated oil flows back to the compressor body 11 through the first pipe 23, realizing recycling. The clean compressed air is transported to the heat dissipation mechanism 30 through the second pipe 24, where heat exchange occurs in the heat dissipation grille 32, and the temperature is reduced. Finally, the cooled low-temperature compressed air enters the storage tank 40 through the pipeline assembly 50 for storage or supply to subsequent equipment. Through the coordinated work of its components, this equipment achieves a highly efficient, energy-saving, and stable compressed air compression and processing process, broadening the application range of variable frequency compressors.

[0066] In this embodiment, the twin-screw assembly 13 specifically includes a first screw 131 and a second screw 132 arranged side by side. The first screw 131 is connected to the output shaft of the first motor 12. Helical gears 133, meshing at 45°, are respectively provided on the first screw 131 and the second screw 132. Through the meshing transmission of the helical gears 133, the two screws can rotate synchronously in opposite directions, achieving efficient gas compression. The design of the helical gears 133 not only improves the smoothness of transmission but also reduces vibration and noise, thereby improving the operating efficiency and stability of the compressor.

[0067] In this embodiment, the first screw 131 further includes a screw body 1311 and a first helical portion 1312 disposed on the screw body 1311. Multiple sets of the first helical portion 1312 are disposed, and the multiple sets of the first helical portion 1312 are evenly arranged along the circumferential direction of the screw body 1311. The first helical portion 1312 has a spiral portion 1313 extending along a spiral line, and arc-shaped protrusions 1314 are respectively disposed on both sides of the spiral portion 1313. The second screw 132 is provided with a second helical portion, and an arc-shaped groove matching the first helical portion 1312 is formed between any two adjacent second helical portions.

[0068] It should be noted that each first helical section 1312 has a spiral section 1313 extending along the spiral line, and each side of the spiral section 1313 is provided with a protruding arc-shaped protrusion 1314. This design increases the contact area between the screw and the air, improving the compression efficiency. The second screw 132 is provided with a second helical section, and an arc-shaped groove matching the first helical section 1312 is formed between any two adjacent second helical sections. The arc-shaped protrusion 1314 of the first helical section 1312 and the arc-shaped groove of the second helical section fit tightly together, forming a good sealing effect, reducing air leakage, and further improving the compression efficiency.

[0069] In this embodiment, it is further explained that the first spiral part 1312, the second spiral part and the surface of the compression chamber are respectively provided with a nanomaterial coating, which is a nano-ceramic coating or a nano-carbon-based coating.

[0070] It should be noted that nanomaterials, with their low coefficient of friction and high hardness, can significantly reduce frictional losses during operation and extend the service life of components when coated on the surfaces of screws and compression chambers. Furthermore, the nano-coating also exhibits excellent corrosion resistance and high-temperature resistance.

[0071] In this embodiment, the heat dissipation mechanism 30 is also provided with a heat dissipation fan 33, which is positioned directly opposite the heat dissipation grille 32 and is connected to a second motor 34; wherein, the center line of the length direction of the heat dissipation grille 32 is set as the first center line, and the thickness of the heat dissipation grille 32 gradually decreases from the first center line to both sides.

[0072] This gradually thickening design increases the heat dissipation surface area, improves heat dissipation, and allows hot air to be cooled more thoroughly as it passes through the heat dissipation grille 32, thus enhancing the performance of the entire heat dissipation system. Furthermore, the shape design of this heat dissipation grille 32 needs to be coordinated with the airflow design of the cooling fan 33. The cooling airflow provided by the cooling fan 33, when passing through this streamlined outer wall, can reduce wind resistance and significantly increase the cooling contact area, thereby reducing noise generation.

[0073] In this embodiment, the pipe assembly 50 is provided with a control valve 51, and a flow sensor is provided at the control valve 51; the heat dissipation mechanism 30 is provided with an air inlet and an air outlet, a first temperature sensor is provided at the air inlet, and a second temperature sensor is provided at the air outlet.

[0074] By monitoring the temperature at the inlet and outlet, data on the change in air temperature before and after heat dissipation can be obtained. The data collected by these sensors is transmitted to the control unit, which analyzes and adjusts the compressor's operating status based on real-time flow and temperature information, thereby controlling the compression process.

[0075] Example 2:

[0076] This invention also provides a control method for a nanomaterial-enhanced variable frequency compressor, applied to control the nanomaterial-enhanced variable frequency compressor as described in Example 1. The control method includes:

[0077] Step S1: Real-time flow and temperature data of compressed air are collected using the flow sensor and temperature sensor integrated on the variable frequency compressor, and instantaneous status parameters are obtained based on the operating parameters of the variable frequency compressor.

[0078] It should be noted that the system can acquire key parameters of the compressor's operation through these sensors, such as the flow sensor and temperature sensor. Subsequently, by combining the operating parameters of the variable frequency compressor, such as the current speed of the first motor 12, the compression ratio, and the ambient temperature, the collected data is processed to obtain the compressor's instantaneous state parameters.

[0079] Step S2: Based on the thermodynamic and hydrodynamic characteristics of the variable frequency compressor, establish a dynamic model of the variable frequency compressor.

[0080] The process of establishing a dynamic model of the compressor involves clarifying the relationship between the compressed air flow rate and the speed of the first motor (12), the internal volume of the compressor, and its volumetric efficiency. Generally, the higher the motor speed, the greater the output flow rate of the compressed air.

[0081] This model describes the temperature change of compressed air during the compression process, including the heat generated during compression and the cooling effect of the heat dissipation mechanism 30. The model considers factors such as the reversibility of the compression process, the compression ratio, and the specific heat capacity of air.

[0082] By combining the compressor's input power, compression work, heat loss, and heat dissipation, an energy balance relationship of the system is established, reflecting the compressor's efficiency and thermal characteristics.

[0083] Step S3: The control unit uses a prediction algorithm, combined with the instantaneous state parameters of the compressor, to perform feedforward prediction of the temperature and flow rate of compressed air, and estimates the future temperature and flow rate change trends.

[0084] Step S4: Based on the predicted temperature and flow rate change trends, the control unit generates a control strategy to adjust the speed of the first motor 12 and the operating parameters of the heat dissipation mechanism 30 in order to pre-adjust the variable frequency compressor.

[0085] The specific process by which the control unit generates the control strategy is as follows:

[0086] 1. Determine the direction of adjustment: Based on the sign of the deviation, determine whether the corresponding control parameters need to be increased or decreased. For example:

[0087] If the predicted temperature rise exceeds the upper limit, measures need to be taken to reduce the temperature.

[0088] If the predicted flow rate is below the lower limit, the flow rate needs to be increased.

[0089] 2. Determine the adjustment range: Calculate the required adjustment range based on the magnitude of the deviation in order to precisely control the system.

[0090] Choosing control measures mainly involves the following two aspects:

[0091] 1. Adjust the speed of the first motor 12:

[0092] Increase speed: If it is necessary to increase the flow rate or compression ratio of compressed air, the speed of the first motor 12 can be increased.

[0093] Reduce speed: If it is necessary to reduce the generation of compression heat to lower the temperature, the speed of the first motor 12 can be reduced.

[0094] II. Adjust the operating parameters of the heat dissipation mechanism 30:

[0095] Increase heat dissipation intensity: Increase the speed of cooling fan 33, increase the flow rate of cooling medium, or reduce the temperature of cooling medium to enhance heat dissipation effect.

[0096] Optimize heat dissipation path: Adjust the opening of heat dissipation grille 32 or change the airflow path to improve heat dissipation efficiency.

[0097] In this embodiment, step S3 specifically includes:

[0098] Step S31: The control unit receives and records the instantaneous state parameters at the current moment. The instantaneous state parameters include:

[0099] The current flow rate and temperature data of compressed air are measured in real time by flow sensors and temperature sensors, reflecting the instantaneous delivery volume and temperature level of compressed air.

[0100] The current speed of the first motor 12 is monitored to understand the working intensity and load of the compressor. Changes in speed directly affect the flow rate and pressure of compressed air.

[0101] The current operating parameters of the heat dissipation mechanism 30, including the speed of the cooling fan 33 and the flow rate of the cooling medium, reflect the operating status and cooling capacity of the heat dissipation system.

[0102] The inlet and outlet pressures of the compression mechanism 10 are obtained through pressure sensors, reflecting the pressure difference during the compression process.

[0103] Environmental parameters, such as ambient temperature, can affect the compressor's heat dissipation efficiency and the physical properties of compressed air.

[0104] Step S32: The control unit analyzes the instantaneous state parameters based on the compressor dynamic model, evaluates the current working state of the variable frequency compressor, and obtains the evaluation results.

[0105] The control unit utilizes a pre-established compressor dynamic model to perform in-depth analysis of the instantaneous state parameters acquired in real time. Based on the compressor's thermodynamic and hydrodynamic characteristics, the compressor dynamic model describes the correlation and variation patterns among various operating parameters.

[0106] In step S33, the control unit uses a prediction algorithm, combined with the evaluation results, to predict the future trends of compressed air temperature and flow rate.

[0107] Step S34: The control unit outputs the predicted future trends in compressed air temperature and flow rate for use in generating a control strategy, specifically including:

[0108] The predicted results are compared with the preset target parameters to determine the deviation of future predictions; the predicted temperature and flow data are compared with the system's preset target parameters (such as ideal temperature range and flow range) to determine the possible deviations in the future, including the magnitude and direction of the deviations.

[0109] Based on the predicted deviation, assess the range of control parameters that need adjustment; based on the predicted deviation, determine the control parameters that need adjustment and the corresponding adjustment range. For example:

[0110] If the predicted temperature will exceed the upper limit, it is necessary to increase the heat dissipation intensity or reduce the compression load;

[0111] If the predicted flow rate is below the lower limit, the speed of the first motor 12 needs to be increased to increase the output of compressed air.

[0112] It outputs predicted temperature and flow rate trends to provide a basis for the formulation of control strategies.

[0113] In this embodiment, step S32 specifically includes:

[0114] Step S321: Calculate the current compressed air generation rate based on the current speed of the first motor 12 and the structural parameters of the compression mechanism 10. By combining the current speed of the first motor 12 with the structural parameters of the compression mechanism 10, the control unit can accurately calculate the current compressed air generation rate, i.e., the amount of compressed air generated per unit time.

[0115] Step S322: Analyze the temperature rise during the compression process using the thermodynamic characteristics of the compression mechanism 10, and determine the trend of compressed air temperature change.

[0116] During compression, air is compressed, its pressure increases, and its volume decreases. According to the laws of thermodynamics, this process leads to an increase in air temperature. The compression ratio, compression efficiency, and the nature of the compression process (such as adiabatic or isothermal) all affect the magnitude of the temperature rise. Using thermodynamic formulas, combined with the current compression ratio and the physical properties of the air, the amount of temperature rise during compression is calculated. Based on the calculated temperature rise, and combined with the initial temperature of the compressed air, the near-term trend of the compressed air temperature is predicted, determining whether the temperature will continue to rise, remain stable, or potentially decrease.

[0117] Step S323: Based on the current operating parameters of the heat dissipation mechanism 30, evaluate its cooling effect on the compressed air temperature.

[0118] Using the aforementioned parameters and in accordance with heat transfer principles, the control unit calculates the current cooling capacity of the heat dissipation mechanism 30 and assesses its effect on reducing the temperature of compressed air. This assessment helps determine whether the operating parameters of the heat dissipation mechanism 30 need to be adjusted to meet current or future cooling requirements.

[0119] Step S324: Combine environmental parameters to evaluate the impact index of external factors on the operation of the compression mechanism 10.

[0120] By assessing the impact of external factors, the control unit can more accurately predict the compressor's operating status and adjust the control strategy as needed to adapt to environmental changes, ensuring the compressor's efficient and stable operation.

[0121] In this embodiment, step S33 specifically includes:

[0122] Step S331: Based on the current compressed air flow rate data and the current rotation speed of the first motor 12, predict the flow rate change trend of the compressed air at future moments; if the rotation speed of the first motor 12 is expected to increase, the flow rate is predicted to increase accordingly, and vice versa.

[0123] Step S332: Based on the compressor dynamic model, taking into account the heat generation during the compression process and the cooling effect of the heat dissipation mechanism 30, predict the temperature change trend of the compressed air in the future; if it is predicted that the compressed air flow will increase and the heat dissipation capacity is insufficient, the temperature may rise.

[0124] Step S333: Based on the thermodynamic and hydrodynamic characteristics of the compression mechanism 10 and the heat dissipation system, determine the lag time T and ∆t, and correct the predicted temperature and flow data to the future time t1=t+T+∆t.

[0125] Step S334: Calculate the rate of change of temperature and flow rate ∆T and ∆Q based on the corrected future temperature and flow rate data and the current temperature and flow rate data.

[0126] Step S335: Determine the upward or downward trend of temperature and flow rate based on the signs of ∆T and ∆Q.

[0127] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a nanomaterial-enhanced variable frequency compressor, characterized in that, The nanomaterial-enhanced variable frequency compressor includes a compression mechanism, an oil separator, a heat dissipation mechanism and a storage tank, a control unit, and a piping assembly. The compression mechanism includes a compressor body and a first motor. The compressor body has a compression chamber for compressing gas. The drive shaft of the first motor is connected to a twin-screw assembly, which is disposed in the compression chamber. The first motor is used to drive the twin-screw assembly to rotate, so that compressed air moves along the piping assembly to the oil separator. The oil separator includes a separation tank, which is equipped with a separation valve group. The separation valve group is connected to at least a first pipe and a second pipe. The first pipe is connected to the compressor body and is used for oil return. The second pipe is connected to the heat dissipation mechanism and is used to transport the gas after oil separation to the heat dissipation mechanism. The heat dissipation mechanism includes a heat dissipation shell with a plurality of heat dissipation grids. Compressed air flows through the heat dissipation grids to dissipate heat, converting high-temperature air into low-temperature air, and then flows through the pipe assembly into the storage tank for storage. The control method includes: Step S1: The flow rate and temperature data of compressed air are collected in real time by the flow sensor and temperature sensor integrated on the variable frequency compressor, and the instantaneous status parameters are obtained based on the operating parameters of the variable frequency compressor. Step S2: Based on the thermodynamic and hydrodynamic characteristics of the variable frequency compressor, establish a compressor dynamic model of the variable frequency compressor; Step S3: The control unit uses a prediction algorithm, combined with the instantaneous state parameters of the compressor, to perform feedforward prediction of the temperature and flow rate of compressed air, and estimates the future temperature and flow rate change trends. Step S4: Based on the predicted temperature and flow rate change trends, the control unit generates a control strategy to adjust the speed of the first motor and the operating parameters of the heat dissipation mechanism in order to pre-adjust the variable frequency compressor. Specifically, step S3 includes: Step S31, the control unit receives and records the instantaneous state parameters at the current moment, the instantaneous state parameters including: The current flow rate and temperature data of the compressed air; The current speed of the first motor; The current operating parameters of the heat dissipation mechanism; The inlet and outlet pressures of the compression mechanism; Environmental parameters: ambient temperature; Step S32: The control unit analyzes the instantaneous state parameters based on the compressor dynamic model, evaluates the current working state of the variable frequency compressor, and obtains the evaluation result. Step S33: The control unit uses a prediction algorithm, combined with the evaluation results, to predict the future trends of compressed air temperature and flow rate. Step S34: The control unit outputs the predicted future trends in compressed air temperature and flow rate for use in generating a control strategy, specifically including: The prediction results are compared with the preset target parameters to determine the deviation of future predictions; Based on the predicted deviation, assess the range of control parameters that need to be adjusted; It outputs predicted temperature and flow rate trends to provide a basis for the formulation of control strategies.

2. The control method for the nanomaterial-enhanced variable frequency compressor according to claim 1, characterized in that, The twin-screw assembly includes a first screw and a second screw arranged side by side, wherein the first screw is connected to the output shaft of the first motor; The first screw and the second screw are respectively provided with helical gears that mesh at 45°.

3. The control method for the nanomaterial-enhanced variable frequency compressor according to claim 2, characterized in that, The first screw includes a screw body and a first helical portion disposed on the screw body. Multiple sets of the first helical portion are disposed, and the multiple sets of the first helical portion are evenly arranged along the circumferential direction of the screw body. The first spiral portion has a spiral portion extending along a spiral line, and each side of the spiral portion is provided with a protruding arc-shaped protrusion. The second screw is provided with a second helical part, and an arc-shaped groove matching the first helical part is formed between any two adjacent second helical parts.

4. The control method for the nanomaterial-enhanced variable frequency compressor according to claim 3, characterized in that, The first spiral section, the second spiral section, and the surface of the compression chamber are respectively provided with a nanomaterial coating, which is a nano-ceramic coating or a nano-carbon-based coating.

5. The control method for the nanomaterial-enhanced variable frequency compressor according to claim 1, characterized in that, The heat dissipation mechanism is also equipped with a heat dissipation fan, which is positioned directly opposite the heat dissipation grille, and the heat dissipation fan is connected to a second motor; The centerline of the heat dissipation grille along its length is designated as the first centerline, and the thickness of the heat dissipation grille gradually decreases from the first centerline toward both sides.

6. The control method for the nanomaterial-enhanced variable frequency compressor according to claim 1, characterized in that, The pipeline assembly is equipped with a control valve, and a flow sensor is installed at the control valve; The heat dissipation mechanism is provided with an air inlet and an air outlet. A first temperature sensor is provided at the air inlet, and a second temperature sensor is provided at the air outlet.

7. The control method for the nanomaterial-enhanced variable frequency compressor according to claim 1, characterized in that, Step S32 specifically includes: Step S321: Calculate the current compressed air generation rate based on the current speed of the first motor and the structural parameters of the compression mechanism; Step S322: Analyze the temperature rise during the compression process using the thermodynamic characteristics of the compression mechanism to determine the trend of compressed air temperature change; Step S323: Based on the current operating parameters of the heat dissipation mechanism, evaluate its cooling effect on the temperature of compressed air. Step S324: Combine environmental parameters to evaluate the impact index of external factors on the operation of the compression mechanism.

8. The control method for the nanomaterial-enhanced variable frequency compressor according to claim 1, characterized in that, Step S33 specifically includes: Step S331: Based on the current compressed air flow rate data and the current rotational speed of the first motor, predict the future flow rate trend of the compressed air. Step S332: Based on the compressor dynamic model, the temperature change trend of compressed air in the future is predicted by combining the heat generation during the compression process and the cooling effect of the heat dissipation mechanism. Step S333: Based on the thermodynamic and hydrodynamic characteristics of the compression mechanism and the heat dissipation system, determine the lag time T and ∆t, and correct the predicted temperature and flow data to the future time t1=t+T+∆t. Step S334: Calculate the rate of change of temperature and flow rate ∆T and ∆Q based on the corrected future temperature and flow rate data and the current temperature and flow rate data; Step S335: Determine the upward or downward trend of temperature and flow rate based on the signs of ∆T and ∆Q.

Images