A screw air compressor oil injection control method, system and intelligent terminal

Abstract

The application relates to a screw air compressor oil injection control method and system and an intelligent terminal, and relates to the field of air compressors. The method comprises the following steps: acquiring the exhaust temperature of the compressor; when the exhaust temperature is higher than a preset high-temperature threshold value, calculating the difference between the exhaust temperature and the high-temperature threshold value and defining the difference as an exhaust temperature difference; determining a lubrication increment according to the exhaust temperature difference; and controlling the preset oil injection device to increase the oil injection amount according to the lubrication increment. The application has the effects of improving the stability of the use of the air compressor and reducing the screw wear.

Description

Technical Field

[0001] This invention relates to the field of air compressors, and more particularly to a method, system, and intelligent terminal for oil injection control of a screw air compressor. Background Technology

[0002] A screw air compressor is a device that converts the mechanical energy of a prime mover into gas pressure energy through the rotation of a screw.

[0003] In the prior art, the screw air compressor first draws air into the internal cavity, and then the rotation of the screw isolates the air in the cavity from the outside world, and the volume of the air decreases as the tooth grooves on the screw shrink, thereby increasing the air pressure. Finally, the high-pressure air is discharged. During the screw rotation process, it is generally necessary to periodically spray lubricating oil onto the screw to reduce screw wear and lower the screw temperature.

[0004] Sprayed lubricating oil is generally recycled. However, lubricating oil used for a long time is prone to deterioration, which reduces its lubrication performance, leading to increased wear on the screw and eventually screw damage. Summary of the Invention

[0005] To improve the stability of air compressor operation and reduce screw wear, this invention provides a screw air compressor oil injection control method, system, and intelligent terminal.

[0006] In a first aspect, the present invention provides a method for controlling oil injection in a screw air compressor, employing the following technical solution:

[0007] A method for controlling oil injection in a screw air compressor includes:

[0008] Obtain the compressor's discharge temperature;

[0009] When the exhaust temperature is higher than the preset high temperature threshold, the difference between the exhaust temperature and the high temperature threshold is calculated and defined as the exhaust temperature difference.

[0010] Determine the lubrication increment based on the exhaust temperature difference;

[0011] The amount of oil injected is increased by controlling the preset oil injection device according to the lubrication increment.

[0012] By adopting the above technical solution, the temperature of the high-pressure gas discharged from the air compressor can be detected in real time. When the temperature is too high, it can be determined that the screw wear is relatively serious. At this time, the amount of sprayed lubricating oil can be increased appropriately according to the high temperature of the gas, thereby reducing screw wear, lowering the temperature of the discharged high-pressure gas, and improving the stability of the air compressor.

[0013] Optional, also includes:

[0014] When the exhaust temperature is higher than the preset high temperature threshold, the preset irradiation device is controlled to irradiate the preset oil storage device from one side and to obtain an oil image from the other side of the preset oil storage device.

[0015] The impurity content is determined based on the oil image, and the service life of the lubricating oil is obtained.

[0016] The baseline content of impurities is determined based on the duration of use;

[0017] When the impurity content is higher than the reference content, the difference between the impurity content and the reference content is calculated and defined as the impurity exceeding the standard.

[0018] Wear information is generated based on excessive impurities;

[0019] The system controls a preset display device to issue a warning based on wear information.

[0020] By adopting the above technical solution, when there is screw wear, the appearance of the lubricating oil can be used to judge the impurities in the lubricating oil, thereby determining the content of metal particles in the lubricating oil, assessing the degree of screw wear, and notifying the staff of the wear level so as to maintain the air compressor in a timely manner.

[0021] Optionally, the method also includes an oil purification method, wherein the oil purification method includes:

[0022] When the impurity content is higher than the baseline content, the oil volume is determined based on the oil image.

[0023] Determine the heating temperature based on the oil volume;

[0024] The oil storage device heats the lubricating oil according to the preset heating temperature and updates the oil image in real time.

[0025] Determine the transmittance of the oil based on the oil image;

[0026] When the light transmittance of the oil is higher than the preset recovery threshold, the upper layer level of the lubricating oil is determined based on the oil image.

[0027] The oil is extracted by a pre-set recovery device based on the upper liquid level.

[0028] By adopting the above technical solution, when the oil deteriorates significantly, the oil is heated by the oil storage device to cause the oil to separate into layers. This causes the more severely deteriorated oil to settle, while the less deteriorated oil floats to the top. The quality of the oil is then judged by its light transmittance, allowing the less deteriorated and higher-quality oil to be extracted for reuse.

[0029] Optionally, it also includes a wear treatment method, the wear treatment method comprising:

[0030] When the impurity content is higher than the reference content, a rotor image of the rotor is obtained;

[0031] Determine the wear location based on the rotor image;

[0032] Determine the degree of wear based on the location of wear;

[0033] Determine the amount of lubricating oil based on the degree of wear;

[0034] The oil spraying device is preset to spray oil onto the wear location based on the amount of lubricating oil.

[0035] By adopting the above technical solution, when the screw wear is severe, the severely worn areas with obvious marks such as scratches can be identified from the appearance of the rotor, and lubricating oil can be sprayed onto the severely worn areas to reduce further wear of the screw.

[0036] Optionally, the wear treatment method further includes:

[0037] The baseline impurity is determined based on the degree of wear.

[0038] When the impurities exceeding the standard are greater than the reference impurities, the rotor temperature is obtained uniformly from multiple points.

[0039] Determine the rotor temperature distribution based on the rotor temperature;

[0040] The location of the temperature anomaly is determined based on the rotor temperature distribution;

[0041] Determine the missed locations based on abnormal and worn locations;

[0042] Generate an anomaly report based on the location of the omission;

[0043] The system controls the preset display device to issue a warning based on the anomaly report.

[0044] By adopting the above technical solution, the volume of metal particles that can be generated at severely worn areas can be assessed from the appearance of the rotor and compared with the metal particle content in the lubricating oil. When the volume of metal particles obtained from the appearance assessment of the rotor is much lower than the metal particle content in the lubricating oil, it indicates that there are multiple minor wears on the rotor. The location of the heat dissipation anomaly can be extracted from the temperature distribution of the rotor as the minor wear area, and the staff can be notified to maintain the air compressor in a timely manner.

[0045] Optionally, the wear treatment method further includes:

[0046] Determine the missed temperature based on the missed location;

[0047] The degree of omission is determined based on the omitted temperature.

[0048] When the degree of omission exceeds the preset impact threshold, the replacement coefficient is determined based on the degree of omission and the degree of wear.

[0049] When the replacement coefficient exceeds the preset replacement threshold, the preset display device is controlled to issue a warning based on the replacement coefficient.

[0050] By adopting the above technical solution, the overall wear condition of the rotor can be assessed from the wear conditions of severely worn and slightly worn areas. When the overall wear of the rotor is too high, it can be determined that the rotor is no longer usable, and staff can be notified to replace the rotor in a timely manner.

[0051] Optionally, a sealing method may also be included, the sealing method comprising:

[0052] When the impurity content is higher than the reference content, obtain the compressor's exhaust pressure;

[0053] When the exhaust pressure is lower than the preset output threshold, the compressor's exhaust volume is obtained;

[0054] Determine the baseline gas volume based on the exhaust gas pressure and exhaust gas volume;

[0055] Calculate the quotient of the baseline air volume and the preset inhalation air volume, and define it as the loss ratio;

[0056] Calculate the quotient of the preset inhalation volume and the loss ratio, and define it as the correction volume;

[0057] The compressor increases the intake air based on the preset air volume control.

[0058] By adopting the above technical solution, when the rotor is worn, the sealing performance of the rotor is easily reduced, which leads to a decrease in the pressure value of the high-pressure gas output by the air compressor. The high-pressure gas pressure value is detected, and when the pressure value is too low, the gas drawn into the air compressor is increased, thereby increasing the pressure of the air compressor output gas.

[0059] Optionally, the sealing method further includes:

[0060] When the corrected air volume exceeds the preset correction threshold, the high temperature location is determined based on the rotor temperature distribution.

[0061] Determine the high-temperature temperature based on the high-temperature location;

[0062] The cooling air volume is determined based on the high temperature.

[0063] The system controls the preset cooling device to move to a high-temperature position and blow air based on the cooling air volume, calculates the difference between the correction air volume and the cooling air volume, and updates the correction air volume.

[0064] By adopting the above technical solution, when the volume of gas to be drawn into the air compressor is large, a portion of the gas is blown directly onto the screw inside the air compressor through a cooling device, thereby reducing the temperature of the screw without affecting the gas compressibility.

[0065] Secondly, this application provides an oil injection control system for a screw air compressor, which adopts the following technical solution:

[0066] A screw air compressor oil injection control system includes:

[0067] The acquisition module is used to acquire exhaust temperature, oil image, usage time, rotor image, rotor temperature, exhaust pressure, and exhaust volume.

[0068] A memory for storing any of the above-mentioned screw air compressor oil injection control methods;

[0069] The processor is the unit of memory that allows programs to be loaded and executed by the processor.

[0070] Thirdly, this application provides a smart terminal, which adopts the following technical solution:

[0071] A smart terminal includes a memory and a processor, wherein the memory stores a method for controlling the oil injection of a screw air compressor that can be loaded by the processor and executed.

[0072] By adopting the above technical solution, the temperature of the high-pressure gas discharged from the air compressor can be detected in real time. When the temperature is too high, it can be determined that the screw wear is relatively serious. At this time, the amount of sprayed lubricating oil can be increased appropriately according to the high temperature of the gas, thereby reducing screw wear, lowering the temperature of the discharged high-pressure gas, and improving the stability of the air compressor.

[0073] In summary, this application includes at least one of the following beneficial technical effects:

[0074] The temperature of the high-pressure gas discharged from the air compressor is monitored in real time. When the temperature is too high, it is determined that the screw wear is relatively serious. At this time, the amount of sprayed lubricating oil is increased appropriately according to the high temperature of the gas, thereby reducing screw wear, lowering the temperature of the discharged high-pressure gas, and improving the stability of the air compressor.

[0075] When screw wear is present, the appearance of the lubricating oil is used to determine the impurities in the lubricating oil, thereby determining the content of metal particles in the lubricating oil, assessing the degree of screw wear, and notifying the staff of the wear level so as to maintain the air compressor in a timely manner.

[0076] When the screw wear is severe, identify the severely worn areas with obvious scratches or other marks on the rotor's appearance, and apply lubricating oil to these severely worn areas to reduce further wear on the screw. Attached Figure Description

[0077] Figure 1 This is a process flow diagram of an oil injection control method for a screw air compressor. Figure 1 ;

[0078] Figure 2 This is a process flow diagram of an oil injection control method for a screw air compressor. Figure 2 ;

[0079] Figure 3 This is a flowchart of an oil purification method;

[0080] Figure 4 This is the process of wear treatment methods. Figure 1 ;

[0081] Figure 5 This is the process of wear treatment methods. Figure 2 ;

[0082] Figure 6 This is the process of wear treatment methods. Figure 3 ;

[0083] Figure 7 This is the process of sealing treatment. Figure 1 ;

[0084] Figure 8 This is the process of sealing treatment. Figure 2 . Detailed Implementation

[0085] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0086] This application discloses an oil injection control method for a screw air compressor. This method is used to determine the wear condition of the screw inside the air compressor from the air pressure, temperature and volume of the exhaust gas of the air compressor, and select an appropriate volume of lubricating oil for spraying according to the wear condition of the screw.

[0087] Reference Figure 1 A method for controlling oil injection in a screw air compressor, comprising:

[0088] Step 100: Obtain the compressor's exhaust temperature.

[0089] Exhaust temperature refers to the temperature value of the high-pressure gas discharged after being compressed by the air compressor. The exhaust temperature can be obtained using a temperature sensor. The method of obtaining the exhaust temperature is selected by the staff according to the actual situation, and will not be elaborated here.

[0090] Step 101: When the exhaust temperature is higher than the preset high temperature threshold, calculate the difference between the exhaust temperature and the high temperature threshold, and define it as the exhaust temperature difference.

[0091] The high-temperature threshold refers to the highest exhaust temperature of the air compressor during normal operation. The high-temperature threshold is selected by the operator based on actual conditions and will not be elaborated upon here. An exhaust temperature higher than the high-temperature threshold indicates that the temperature of the discharged high-pressure gas is too high, meaning that the screw inside the air compressor is experiencing severe wear. The exhaust temperature difference is the difference between the exhaust temperature and the high-temperature threshold, and it reflects the high temperature of the high-pressure gas.

[0092] Step 102: Determine the lubrication increment based on the exhaust temperature difference.

[0093] Lubrication increment refers to the increased volume of lubricating oil required when the screw is severely worn. The lubrication increment can be obtained from the increment relationship table, which is a data table that records different exhaust temperature differences obtained through experiments and their corresponding lubrication increments.

[0094] Step 103: Increase the amount of oil injected by controlling the preset oil injection device according to the lubrication increment.

[0095] The oil injection device refers to the equipment in the air compressor used to spray lubricating oil onto the screw. The oil injection device is selected by the staff according to the actual situation, and will not be described in detail here.

[0096] The system monitors the temperature of the high-pressure gas discharged from the air compressor in real time. When the temperature is too high, it indicates that the screw wear is severe. In this case, the amount of lubricating oil sprayed is increased appropriately according to the high temperature of the gas, thereby reducing screw wear, lowering the temperature of the discharged high-pressure gas, and improving the stability of the air compressor.

[0097] Reference Figure 2 A method for controlling oil injection in a screw air compressor, further comprising:

[0098] Step 104: When the exhaust temperature is higher than the preset high temperature threshold, control the preset irradiation device to irradiate the preset oil storage device from one side, and obtain an oil image from the other side of the preset oil storage device.

[0099] An irradiation device is a device used to irradiate lubricating oil to make impurities in the lubricating oil more visible. An oil storage device is a container inside an air compressor used to store lubricating oil. The oil storage device uses a transparent container to facilitate external observation. The bottom of the oil storage device is also equipped with a heating device for heating the oil to cause the oil to separate into layers. The irradiation device and the oil storage device are selected by the staff according to the actual situation, and will not be elaborated here.

[0100] An oil image refers to a picture of the lubricating oil in an oil storage device after it has been irradiated by an irradiation device. Oil images can be acquired using a camera, and the method of acquiring oil images is selected by the staff according to the actual situation, which will not be elaborated here.

[0101] Step 105: Determine the impurity content based on the oil image and obtain the service life of the lubricating oil.

[0102] Impurity content refers to the volume of solids contained in the oil. Impurity content generally includes the volume of sediment at the bottom of the oil storage device and the volume of suspended solid particles in the oil. Impurity content can be obtained by image recognition technology. The method for identifying impurity content is common knowledge to those in the field and will not be elaborated here.

[0103] Usage time refers to the duration of air compressor operation from the time the lubricating oil is changed to the current moment. Usage time can be obtained through a timer. The method for obtaining usage time is selected by the staff according to the actual situation, and will not be elaborated here.

[0104] Step 106: Determine the baseline content of impurities based on the usage time.

[0105] The reference content refers to the volume of impurities that a lubricating oil can produce after a period of use under normal operating conditions. The reference content can be obtained from the content relationship table, which is a data table that records different usage times and their corresponding reference contents obtained through experiments.

[0106] Step 107: When the impurity content is higher than the reference content, calculate the difference between the impurity content and the reference content, and define it as an impurity exceeding the standard.

[0107] An impurity content higher than the benchmark content indicates that there are more impurities in the lubricating oil than can be produced by normal deterioration of the lubricating oil. This means that the screw surface has been worn, resulting in the formation of metal particles. Excessive impurities refer to the difference between the impurity content and the benchmark content. Excessive impurities indicate the amount of metal particles produced by screw wear.

[0108] Step 108: Generate wear information based on excessive impurities.

[0109] The display device refers to the equipment used to show information to the staff to demonstrate the working status of the air compressor. The display device is selected by the staff according to the actual situation and will not be elaborated here. Wear information refers to the information used to display the wear condition of the screw to the staff through the display device. Wear information can be a line graph of excessive impurities versus time, or a pie chart of excessive impurities versus impurity content. The method of generating wear information is selected by the staff according to the actual situation and will not be elaborated here.

[0110] Step 109: Control the preset display device to issue a warning based on the wear information.

[0111] When screw wear is present, the appearance of the lubricating oil is used to determine the amount of impurities in the lubricating oil, thereby assessing the degree of screw wear. The wear level is then displayed on a device to notify the staff for timely maintenance of the air compressor.

[0112] Reference Figure 3 Oil purification methods include:

[0113] Step 110: When the impurity content is higher than the baseline content, determine the oil capacity based on the oil image.

[0114] Oil capacity refers to the volume of oil in an oil storage device. Oil capacity can be determined using image recognition technology. The method for determining oil capacity is common knowledge to those in the field and will not be elaborated here.

[0115] Step 111: Determine the heating temperature based on the oil volume.

[0116] Heating temperature refers to the temperature value required to fully heat the oil through the oil storage device. The heating temperature can be obtained by looking up the temperature relationship table, which is a data table that records different oil capacities and their corresponding heating temperatures.

[0117] Step 112: Heat the lubricating oil using the preset oil storage device according to the heating temperature, and update the oil image in real time.

[0118] While heating the lubricating oil through the oil storage device, the surface of the oil is fed back through the oil image, thereby confirming the real-time quality status of the oil.

[0119] Step 113: Determine the transmittance of the oil based on the oil image.

[0120] Oil transmittance refers to the percentage of light flux of the oil in the oil storage device as a function of height, relative to the incident light flux. Oil transmittance can be determined using image recognition technology. The method for determining oil transmittance is common knowledge in the field and will not be elaborated here.

[0121] Step 114: When the oil transmittance is higher than the preset recovery threshold, determine the upper layer level of the lubricating oil based on the oil image.

[0122] The recycling threshold refers to the minimum transmittance value of the lubricating oil that can be reused. The recycling threshold is selected by the staff based on the actual situation and will not be elaborated here. An oil transmittance higher than the recycling threshold indicates better oil quality, meaning that the oil in the storage device has stratified into recyclable lubricating oil. The upper liquid level refers to the highest point of the oil in the image. The upper liquid level can be determined using image recognition technology; the method for determining the upper liquid level is common knowledge in the field and will not be elaborated here.

[0123] Step 115: Extract oil using the preset recovery device based on the upper liquid level.

[0124] A recovery device is a device used to extract and reuse oil. The choice of recovery device is made by the staff based on the actual situation and will not be elaborated here. When the oil is severely degraded, the oil is heated through an oil storage device to cause the oil to separate into layers. This causes the more severely degraded oil to settle, while the less degraded oil floats to the top. The quality of the oil is then determined by its light transmittance, allowing the less degraded and higher-quality oil to be extracted for reuse.

[0125] If no oil exceeding the recovery threshold is found in the oil image after a preset waiting time, the oil in the oil storage device is poured out and discarded, the inner wall of the oil storage device is cleaned, and the oil in the recovery device is then injected into the oil storage device for recycling. The waiting time is selected by the staff according to the actual situation, and will not be elaborated here.

[0126] Reference Figure 4 Wear treatment methods include:

[0127] Step 200: When the impurity content is higher than the reference content, obtain a rotor image of the rotor.

[0128] Rotor images refer to pictures of the rotor inside an air compressor. Rotor images can be acquired through a camera. The method of acquiring rotor images is selected by the staff according to the actual situation, and will not be elaborated here.

[0129] Step 201: Determine the wear location based on the rotor image.

[0130] Wear location refers to the location on the rotor where there are scratches or defects. Wear location can be determined by image recognition technology. The method for determining wear location is common knowledge to those in the field and will not be elaborated here.

[0131] Step 202: Determine the degree of wear based on the location of wear.

[0132] Wear degree refers to a numerical value used to show the wear condition of the screw. The longer and deeper the scratches on the rotor, and the larger the damaged area, the greater the wear degree. The wear degree can be determined by image recognition technology. The method for determining the wear degree is common knowledge to those in the field and will not be elaborated here.

[0133] Step 203: Determine the amount of lubricating oil based on the degree of wear.

[0134] The amount of lubricating oil refers to the volume of lubricating oil sprayed to reduce screw wear. The amount of lubricating oil can be obtained from the oil quantity relationship table, which is a data table that records different wear levels and their corresponding lubricating oil quantities obtained through experiments.

[0135] Step 204: Control the preset oil injection device to spray oil onto the wear location according to the amount of lubricating oil.

[0136] When the screw wear is severe, identify the severely worn areas with obvious scratches or other marks on the rotor's appearance, and apply lubricating oil to these severely worn areas to reduce further wear on the screw.

[0137] Reference Figure 5 Wear treatment methods also include:

[0138] Step 205: Determine the reference impurity based on the degree of wear.

[0139] The reference impurity refers to the maximum volume of metal particles that a screw with a certain degree of wear can produce. The reference impurity can be obtained from the impurity relationship table, which is a data table that records different degrees of wear and their corresponding reference impurities obtained through experiments.

[0140] Step 206: When the impurities exceeding the standard are greater than the reference impurities, the rotor temperature is obtained uniformly at multiple points.

[0141] Impurity content greater than the benchmark impurity indicates that the volume of metal particles in the lubricating oil is greater than the maximum volume of metal particles that a worn screw can produce. There are also many undetected micro-wear points on the screw. Rotor temperature refers to the temperature value of the rotor obtained at the same uniform intervals. The rotor temperature can be obtained by temperature sensors evenly distributed on the rotor. The method of obtaining the rotor temperature is selected by the staff according to the actual situation, and will not be elaborated here.

[0142] Step 207: Determine the rotor temperature distribution based on the rotor temperature.

[0143] Rotor temperature distribution refers to the temperature distribution area of ​​the rotor. Since the rotor is made of a single and uniform material, the overall thermal conductivity of the rotor is the same. Therefore, the overall heat distribution of the rotor can be inferred from the rotor temperature. The method for determining the rotor temperature distribution is common knowledge to those in the field and will not be elaborated here.

[0144] Step 208: Determine the location of the temperature anomaly based on the rotor temperature distribution.

[0145] An abnormal location refers to the location on the rotor where the heating is abnormal. The abnormal location can be extracted from the temperature distribution of the rotor as the abnormal location. The method for determining the abnormal location is common knowledge to those in the field and will not be elaborated here.

[0146] Step 209: Determine the missed locations based on the abnormal and worn locations.

[0147] The omission location refers to the set of location points obtained after removing the location points that correspond to the wear location from the omission location. The method for determining the omission location is common knowledge to those in the field and will not be elaborated here.

[0148] Step 210: Generate an anomaly report based on the missing location.

[0149] An anomaly report is information used to display minor wear on the screw to workers via a display device. The method for generating anomaly reports is common knowledge to those in the field and will not be elaborated here.

[0150] Step 211: Control the preset display device to issue a warning based on the abnormality report.

[0151] Assess the volume of metal particles generated at severely worn areas by examining the rotor's appearance and compare it with the metal particle content in the lubricating oil. If the volume of metal particles obtained from the rotor's appearance assessment is much lower than the metal particle content in the lubricating oil, it indicates that there are multiple minor wear points on the rotor. Extract the locations of abnormal heat generation from the rotor's temperature distribution as minor wear points and notify the staff to maintain the air compressor in a timely manner.

[0152] Reference Figure 6 Wear treatment methods also include:

[0153] Step 212: Determine the missing temperature based on the missing location.

[0154] The missing temperature refers to the temperature value at the missing location on the rotor temperature distribution. The method for determining the missing location is common knowledge to those in the field and will not be elaborated here.

[0155] Step 213: Determine the degree of omission based on the omission temperature.

[0156] The degree of omission refers to the wear level of the omission location. The degree of omission can be obtained from the degree relationship table, which records the relationship between different omission temperatures and their corresponding omission degrees.

[0157] Step 214: When the degree of omission is higher than the preset impact threshold, determine the replacement coefficient based on the degree of omission and the degree of wear.

[0158] The impact threshold refers to the minimum degree of wear that can easily affect the overall structural strength of the screw. The impact threshold is selected by the staff based on the actual situation and will not be elaborated upon here. An omission level higher than the impact threshold indicates that wear at the omitted locations is likely to lead to a decrease in the overall structural strength of the screw. The replacement coefficient is a value used to represent the overall damage level of the rotor. The higher the values ​​of the omission level and wear level, and the more numerous the omissions and wear, the higher the replacement coefficient. The higher the degree of rotor damage, the more necessary it is to replace the rotor. The method for determining the replacement coefficient is selected by the staff based on the actual situation and will not be elaborated upon here.

[0159] Step 215: When the replacement coefficient exceeds the preset replacement threshold, control the preset display device to issue a warning based on the replacement coefficient.

[0160] The replacement threshold refers to the maximum replacement factor at which the rotor must be replaced. The replacement threshold is selected by the staff based on the actual situation and will not be elaborated upon here. If the replacement factor exceeds the replacement threshold, it indicates that the rotor is severely damaged and needs immediate replacement. A warning will be issued via the display device to notify the staff to replace the rotor as soon as possible to minimize further damage to the air compressor.

[0161] The overall wear condition of the rotor is assessed by examining the wear at severely worn and slightly worn areas. When the overall wear of the rotor is too high, it is determined that the rotor can no longer be used, and staff are notified to replace the rotor in a timely manner.

[0162] Reference Figure 7 Sealing methods include:

[0163] Step 300: When the impurity content is higher than the reference content, obtain the exhaust gas pressure of the compressor.

[0164] Exhaust pressure refers to the pressure value of the high-pressure gas output by the air compressor. Exhaust pressure can be obtained through a pressure sensor. The method of obtaining exhaust pressure is selected by the staff according to the actual situation, and will not be elaborated here.

[0165] Step 301: When the exhaust pressure is lower than the preset output threshold, obtain the exhaust volume of the compressor.

[0166] The output threshold refers to the minimum pressure value of the gas that the air compressor is required to output. The output threshold is selected by the operator based on the actual situation and will not be elaborated here. An exhaust pressure lower than the output threshold indicates that the air compressor is outputting insufficient gas pressure. The exhaust volume refers to the volume of high-pressure gas output by the air compressor per unit time. The method for obtaining the exhaust volume is selected by the operator based on the actual situation and will not be elaborated here.

[0167] Step 302: Determine the baseline gas volume based on the exhaust gas pressure and exhaust gas volume.

[0168] The reference gas volume refers to the exhaust gas pressure, exhaust gas volume, and gas volume under normal pressure. The method for determining the reference gas volume is common knowledge to those in the field and will not be elaborated here.

[0169] Step 303: Calculate the quotient of the baseline air volume and the preset intake air volume, and define it as the loss ratio.

[0170] Intake volume refers to the volume of air drawn in by the air compressor per unit time. The intake volume is selected by the operator based on actual conditions and will not be elaborated upon here. The loss ratio is the quotient of the baseline volume and the intake volume, and it reflects the leakage of gas during air compression.

[0171] Step 304: Calculate the quotient of the preset inhalation volume and loss ratio, and define it as the correction volume.

[0172] Corrected air volume refers to the quotient of intake air volume and loss ratio. It is the volume of compressed air that needs to be drawn in to obtain the intake air volume under leakage conditions with loss ratio.

[0173] Step 305: Increase the intake air by controlling the preset compressor according to the corrected air volume.

[0174] When the rotor is worn, its sealing performance is easily reduced, which in turn reduces the pressure of the high-pressure gas output by the air compressor. The system detects the pressure of the high-pressure gas and increases the amount of gas drawn into the air compressor when the pressure is too low, thereby increasing the pressure of the gas output by the air compressor.

[0175] Reference Figure 8 The sealing treatment method also includes:

[0176] Step 306: When the correction air volume exceeds the preset correction threshold, determine the high temperature location based on the rotor temperature distribution.

[0177] The correction threshold refers to the maximum volume of gas that an air compressor can draw in per unit time. The correction threshold is selected by the operator based on the actual situation and will not be elaborated here. Exceeding the correction threshold indicates that the air compressor needs to draw in too much gas, making it difficult for the compressor to provide sufficient air in a timely manner. The high-temperature position refers to the point with the highest temperature in the rotor temperature distribution. The method for determining the high-temperature position is common knowledge in the field and will not be elaborated here.

[0178] Step 307: Determine the high temperature based on the high temperature location.

[0179] High temperature refers to the temperature value of the rotor at a high temperature position. The method for determining the high temperature is common knowledge to those in the field and will not be elaborated here.

[0180] Step 308: Determine the cooling air volume based on the high temperature.

[0181] Cooling air volume refers to the volume of air required per unit time to reduce the temperature of the screw. Cooling air volume can be obtained from the cooling relationship table, which is a data table that records different high temperatures and their corresponding cooling air volumes.

[0182] Step 309: Based on the cooling air volume, control the preset cooling device to move to the high temperature position and blow air, calculate the difference between the correction air volume and the cooling air volume, and update the correction air volume.

[0183] When the air compressor needs to draw in a large volume of gas, a portion of the gas is blown directly onto the screw inside the air compressor through a cooling device, thereby reducing the screw temperature without affecting the gas compressibility.

[0184] Based on the same inventive concept, embodiments of the present invention provide an oil injection control system for a screw air compressor, comprising:

[0185] The acquisition module is used to acquire exhaust temperature, oil image, usage time, rotor image, rotor temperature, exhaust pressure, and exhaust volume.

[0186] A memory for storing any of the above-mentioned screw air compressor oil injection control methods;

[0187] The processor is the unit of memory that allows programs to be loaded and executed by the processor.

[0188] Based on the same inventive concept, embodiments of the present invention provide a smart terminal, including a memory and a processor, wherein the memory stores a method for controlling the oil injection of a screw air compressor that can be loaded and executed by the processor.

[0189] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0190] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method of oil injection control for a screw air compressor, characterized by, The method comprises: acquiring an exhaust temperature of the compressor; when the exhaust temperature is higher than a preset high temperature threshold, calculating a difference between the exhaust temperature and the high temperature threshold, and defining the difference as an exhaust temperature difference; determining a lubrication increment according to the exhaust temperature difference; controlling a preset oil injection device to increase an oil injection amount according to the lubrication increment; The method further comprises: when the exhaust temperature is higher than the preset high temperature threshold, controlling a preset irradiation device to irradiate a preset oil storage device from one side and acquiring an oil image from the other side of the preset oil storage device; determining an impurity content according to the oil image, and acquiring a service time of the lubricating oil; determining a reference content of the impurity according to the service time; when the impurity content is higher than the reference content, calculating a difference between the impurity content and the reference content, and defining the difference as an over-standard impurity; generating wear information according to the over-standard impurity; controlling a preset display device to issue a warning according to the wear information; The method further comprises an oil purification method, which comprises: when the impurity content is higher than the reference content, determining an oil volume according to the oil image; determining a heating temperature according to the oil volume; controlling the preset oil storage device to heat the lubricating oil according to the heating temperature, and updating the oil image in real time; determining an oil transmittance according to the oil image; when the oil transmittance is higher than a preset recovery threshold, determining an upper liquid level of the lubricating oil according to the oil image; controlling a preset recovery device to extract the oil according to the upper liquid level; The method further comprises a wear treatment method, which comprises: when the impurity content is higher than the reference content, acquiring a rotor image of a rotor; determining a wear position according to the rotor image; determining a wear degree based on the wear position; determining a lubricating oil amount according to the wear degree; controlling a preset oil injection device to inject oil to the wear position according to the lubricating oil amount; The wear treatment method further comprises: determining a reference impurity according to the wear degree; when the over-standard impurity is greater than the reference impurity, uniformly acquiring a rotor temperature of the rotor at multiple points; determining a rotor temperature distribution according to the rotor temperature; determining an abnormal position of a temperature anomaly according to the rotor temperature distribution; determining a missing position according to the abnormal position and the wear position; generating an abnormal report according to the missing position; controlling a preset display device to issue a warning according to the abnormal report; The wear treatment method further comprises: determining a missing temperature based on the missing position; determining a missing degree according to the missing temperature; when the missing degree is higher than a preset influence threshold, determining a replacement coefficient according to the missing degree and the wear degree; when the replacement coefficient exceeds a preset replacement threshold, controlling a preset display device to issue a warning according to the replacement coefficient.

2. A method of oil injection control for a screw air compressor as set forth in claim 1, wherein The method further comprises a sealing treatment method, which comprises: when the impurity content is higher than the reference content, acquiring an exhaust gas pressure of the compressor; when the exhaust gas pressure is lower than a preset output threshold, acquiring an exhaust gas amount of the compressor; determining a reference gas amount according to the exhaust gas pressure and the exhaust gas amount; calculating a quotient of the reference gas amount and a preset suction gas amount, and defining the quotient as a loss ratio; calculating a quotient of the preset suction gas amount and the loss ratio, and defining the quotient as a corrected gas amount; controlling a preset compressor to increase the inhaled air according to the corrected gas amount.

3. A method of oil injection control for a screw air compressor as set forth in claim 2, wherein The sealing treatment method further comprises: when the corrected gas amount exceeds a preset correction threshold, determining a high temperature position according to the rotor temperature distribution; determining a high temperature temperature based on the high temperature position; Determine the cooling air volume according to the high temperature; Control the preset cooling device to move to the high temperature position and blow according to the cooling air volume, calculate the difference between the corrected air volume and the cooling air volume, and update the corrected air volume.

4. A screw air compressor oil injection control system, characterized by, Comprise: An acquisition module is configured to acquire exhaust temperature, oil image, service time, rotor image, rotor temperature, exhaust pressure and exhaust air volume; A memory is configured to store a screw air compressor oil injection control method according to any one of claims 1 to 3; A processor, the program in the memory can be loaded and executed by the processor.

5. A smart terminal, characterized by Comprise a memory and a processor, the memory has a screw air compressor oil injection control method according to any one of claims 1 to 3 which can be loaded and executed by the processor.

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