Screw air compressor oil injection control method and system and intelligent terminal

Abstract

The invention relates to an oil injection control method and system for a screw air compressor and an intelligent terminal, and relates to the field of air compressors. When the exhaust temperature is higher than a preset high-temperature threshold value, the difference between the exhaust temperature and the high-temperature threshold value is calculated and defined as an exhaust temperature difference; determining lubrication increment according to the exhaust temperature difference; and controlling a preset oil injection device to increase the oil injection quantity according to the lubrication increment. The air compressor has the effects that the use stability of the air compressor is improved, and the screw abrasion condition is reduced.

Description

Technical Field

[0001] The present invention relates to the field of air compressors, and in particular, to an oil injection control method, system and intelligent terminal for a screw air compressor. Background Art

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

[0003] In the prior art, a screw air compressor first sucks air into an internal cavity, then isolates the air in the cavity from the outside by the rotation of the screw, and reduces the volume of the air as the tooth grooves on the screw shrink, thereby increasing the air pressure. Finally, the high-pressure air is discharged. During the rotation of the screw, lubricating oil generally needs to be sprayed regularly to reduce the wear of the screw and lower the temperature of the screw.

[0004] The sprayed lubricating oil is generally recycled. The lubricating oil used for a long time is prone to deterioration, resulting in a reduction in lubricating performance, which in turn leads to an increase in the wear of the screw and further causes the screw to be damaged. Summary of the Invention

[0005] In order to improve the stability of the use of the air compressor and reduce the wear of the screw, the present invention provides an oil injection control method, system and intelligent terminal for a screw air compressor.

[0006] In a first aspect, the present invention provides an oil injection control method for a screw air compressor, adopting the following technical solutions: An oil injection control method for a screw air compressor includes: Obtaining the exhaust temperature of the compressor; When the exhaust temperature is higher than a preset high-temperature threshold, calculating the difference between the exhaust temperature and the high-temperature threshold, and defining it as the exhaust temperature difference; Determining a lubrication increment according to the exhaust temperature difference; Controlling a preset oil injection device to increase the oil injection amount according to the lubrication increment.

[0007] By adopting the above technical solutions, the temperature of the high-pressure gas discharged by the air compressor is detected in real time, and when the temperature is too high, it is judged that the wear of the screw is relatively serious. At this time, the lubricating oil sprayed is appropriately increased according to the high temperature of the gas, thereby reducing the wear of the screw, lowering the temperature of the discharged high-pressure gas, and improving the stability of the use of the air compressor.

[0008] Optionally, it further includes: When the exhaust temperature is higher than a preset high-temperature threshold, controlling a preset irradiation device to irradiate a preset oil storage device from one side and obtaining an oil liquid image from the other side of the preset oil storage device; Determine the impurity content based on the oil fluid image and obtain the usage duration of the lubricating oil; Determine the reference content of impurities according to the usage duration; 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 the excessive impurities; Generate wear information based on the excessive impurities; Control a preset display device to issue a warning according to the wear information.

[0009] By adopting the above technical solution, when there is a situation of screw wear, judge the impurity situation in the lubricating oil from the appearance of the lubricating oil, thereby judge the metal particle content in the lubricating oil, further evaluate the wear degree of the screw, and notify the staff of the wear degree for timely maintenance of the air compressor.

[0010] Optionally, it further includes an oil fluid purification method, and the oil fluid purification method includes: When the impurity content is higher than the reference content, determine the oil fluid volume according to the oil fluid image; Determine the heating temperature according to the oil fluid volume; Control a preset oil storage device to heat the lubricating oil according to the heating temperature and update the oil fluid image in real time; Determine the oil fluid transmittance according to the oil fluid image; When the oil fluid transmittance is higher than a preset recovery threshold, determine the upper liquid level of the lubricating oil according to the oil fluid image; Control a preset recovery device to extract the oil fluid according to the upper liquid level.

[0011] By adopting the above technical solution, when the oil fluid deteriorates severely, heat the oil fluid through the oil storage device to make the oil fluid stratified, so that the severely deteriorated oil fluid precipitates, the oil fluid with a lower deterioration degree floats, and judge the quality of the oil fluid through the oil fluid transmittance, thereby extract the oil fluid with a lower deterioration degree and better quality for reuse.

[0012] Optionally, it further includes a wear treatment method, and the wear treatment method includes: When the impurity content is higher than the reference content, obtain the rotor image of the rotor; Determine the wear position according to the rotor image; Determine the wear degree based on the wear position; Determine the lubricating oil quantity according to the wear degree; Control a preset oil injection device to inject oil at the wear position according to the lubricating oil quantity.

[0013] By adopting the above technical solution, when the wear situation of the screw is relatively serious, identify the severely worn areas with obvious scratches and other marks from the appearance of the rotor, and spray lubricating oil on the severely worn areas emphatically, thereby reducing the further wear of the screw.

[0014] Optionally, the wear treatment method further includes: Determining a reference impurity according to the degree of wear; When the excessive impurities are greater than the reference impurity, obtaining the rotor temperature of the rotor evenly at multiple points; Determining the rotor temperature distribution according to the rotor temperature; Determining the abnormal position with abnormal temperature according to the rotor temperature distribution; Determining the 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.

[0015] By adopting the above technical solution, the volume of metal particles generated by the severely worn part of the rotor is evaluated 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 evaluation of the rotor is much lower than the metal particle content in the lubricating oil, it means that there are multiple minor wear on the rotor. The position with abnormal heat generation is extracted from the rotor temperature distribution as the minor wear position, and the staff is notified for timely maintenance of the air compressor.

[0016] Optionally, the wear treatment method further includes: Determining a missing temperature based on the missing position; Determining the 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.

[0017] By adopting the above technical solution, the overall wear condition of the rotor is evaluated from the wear conditions of the severely worn part and the minor worn part of the rotor. When the overall wear of the rotor is too high, it is judged that the rotor is difficult to continue to be used, and the staff is notified to replace the rotor in time.

[0018] Optionally, it further includes a sealing treatment method, and the sealing treatment method includes: When the impurity content is higher than the reference content, obtaining the exhaust air pressure of the compressor; When the exhaust air pressure is lower than a preset output threshold, obtaining the exhaust air volume of the compressor; Determining a reference air volume according to the exhaust air pressure and the exhaust air volume; Calculating the quotient of the reference air volume and the preset intake air volume and defining it as the loss ratio; Calculating the quotient of the preset intake air volume and the loss ratio and defining it as the corrected air volume; Controlling a preset compressor to increase the inhaled air according to the corrected air volume.

[0019] By adopting the above technical solution, when the rotor is worn, it is likely to cause a decline in the sealing performance of the rotor, thereby resulting in a decrease in the pressure value of the high-pressure gas output by the air compressor. Detect the pressure value of the high-pressure gas, and when the pressure value is too low, increase the gas inhaled by the air compressor, thereby increasing the pressure of the gas output by the air compressor.

[0020] Optionally, the sealing treatment method further includes: When the corrected air volume exceeds the preset correction threshold, determine the high-temperature position according to the rotor temperature distribution; Determine the high-temperature according to 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 air 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.

[0021] By adopting the above technical solution, when the volume of the gas to be inhaled by the air compressor is large, a part of the gas is directly blown to the screw in the air compressor by the cooling device, thereby reducing the temperature of the screw without affecting the gas compression ratio.

[0022] In a second aspect, the present application provides an oil injection control system for a screw air compressor, adopting the following technical solution: An oil injection control system for a screw air compressor includes: An acquisition module for acquiring the exhaust temperature, oil image, usage duration, rotor image, rotor temperature, exhaust pressure, and exhaust air volume; A memory for storing any one of the above oil injection control methods for a screw air compressor; A processor capable of loading and executing the program in the memory.

[0023] In a third aspect, the present application provides an intelligent terminal, adopting the following technical solution: An intelligent terminal includes a memory and a processor, and the memory stores a program that can be loaded and executed by the processor for any one of the above oil injection control methods for a screw air compressor.

[0024] By adopting the above technical solution, the temperature of the high-pressure gas discharged by the air compressor is detected in real time, and when the temperature is too high, it is determined that the wear of the screw is relatively serious. At this time, the sprayed lubricating oil is appropriately increased according to the high-temperature situation of the gas, thereby reducing the wear of the screw, lowering the temperature of the discharged high-pressure gas, and improving the stability of the air compressor during use.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: Detect the temperature of the high-pressure gas discharged by the air compressor in real time, and when the temperature is too high, judge that the wear of the screw is relatively serious. At this time, appropriately increase the sprayed lubricating oil according to the high temperature of the gas, so as to reduce the screw wear, lower the temperature of the discharged high-pressure gas, and improve the stability of the air compressor during use; When there is screw wear, judge the impurity situation in the lubricating oil from the appearance of the lubricating oil, so as to judge the metal particle content in the lubricating oil, and then evaluate the wear degree of the screw, and notify the staff of the wear degree in time to maintain the air compressor; When the wear of the screw is relatively serious, identify the severely worn areas with obvious scratches and other marks from the appearance of the rotor, and spray lubricating oil on the severely worn areas emphatically, so as to reduce the further wear of the screw. Description of the Drawings

[0026] Figure 1 is the flow of an oil injection control method for a screw air compressor Figure 1 ; Figure 2 is the flow of an oil injection control method for a screw air compressor Figure 2 ; Figure 3 is the flowchart of the oil purification method; Figure 4 is the flow of the wear treatment method Figure 1 ; Figure 5 is the flow of the wear treatment method Figure 2 ; Figure 6 is the flow of the wear treatment method Figure 3 ; Figure 7 is the flow of the sealing treatment method Figure 1 ; Figure 8 is the flow of the sealing treatment method Figure 2 。 Detailed Embodiments

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present 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 only used to explain the present invention and are not used to limit the present invention.

[0028] This application embodiment discloses an oil injection control method for a screw air compressor. This method is used to judge the wear condition of the screw inside the air compressor from the air pressure, temperature and volume of the discharged gas of the air compressor, and select an appropriate lubricating oil volume for spraying according to the wear condition of the screw.

[0029] Refer toFigure 1 , a method for controlling oil injection of a screw air compressor, comprising: Step 100: Obtain the exhaust temperature of the compressor.

[0030] The 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 by a temperature sensor, and the method for obtaining the exhaust temperature is selected by the staff according to the actual situation and will not be elaborated here.

[0031] Step 101: When the exhaust temperature is higher than a preset high-temperature threshold, calculate the difference between the exhaust temperature and the high-temperature threshold, and define it as the exhaust temperature difference.

[0032] The high-temperature threshold refers to the highest exhaust temperature when the air compressor is working normally. The high-temperature threshold is selected by the staff according to the actual situation and will not be elaborated here. The exhaust temperature being higher than the high-temperature threshold means that the temperature of the discharged high-pressure gas is too high, that is, the wear condition of the screw in the air compressor is relatively serious. The exhaust temperature difference refers to the difference between the exhaust temperature and the high-temperature threshold, and the high-temperature situation of the high-pressure gas is shown through the exhaust temperature difference.

[0033] Step 102: Determine the lubrication increment according to the exhaust temperature difference.

[0034] The lubrication increment refers to the volume of lubricating oil that needs to be increased when the screw is severely worn. The lubrication increment can be obtained by querying from an increment relationship table, and the increment relationship table is a data table that records different exhaust temperature differences obtained through experiments and their corresponding lubrication increments.

[0035] Step 103: Control a preset oil injection device to increase the oil injection volume according to the lubrication increment.

[0036] 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 elaborated here.

[0037] Real-time detect the temperature of the high-pressure gas discharged by the air compressor, and when the temperature is too high, judge that the wear condition of the screw is relatively serious. At this time, appropriately increase the sprayed lubricating oil according to the high-temperature situation of the gas, so as to reduce the wear of the screw, lower the temperature of the discharged high-pressure gas, and improve the stability of the air compressor during use.

[0038] Refer to Figure 2 , a method for controlling oil injection of a screw air compressor, further comprising: Step 104: When the exhaust temperature is higher than a preset high-temperature threshold, control a preset irradiation device to irradiate a preset oil storage device from one side and obtain an oil liquid image from the other side of the preset oil storage device.

[0039] The irradiation device refers to the equipment used to irradiate the lubricating oil to make the impurities in the lubricating oil more obvious. The oil storage device refers to the container used to store the lubricating oil in the air compressor. The oil storage device adopts a transparent container to facilitate external observation. A heating device is also provided at the bottom of the oil storage device to heat the oil liquid to make the oil liquid stratified. The irradiation device and the oil storage device are selected by the staff according to the actual situation and will not be elaborated here.

[0040] The oil liquid image refers to the picture of the lubricating oil in the oil storage device obtained after being irradiated by the irradiation device. The oil liquid image can be obtained by a camera. The method for obtaining the oil liquid image is selected by the staff according to the actual situation and will not be elaborated here.

[0041] Step 105: Determine the impurity content based on the oil liquid image and obtain the usage duration of the lubricating oil.

[0042] The impurity content refers to the volume of solids contained in the oil liquid. The impurity content generally includes the volume of precipitation at the bottom of the oil storage device and the volume of solid particles suspended in the oil liquid. The impurity content can be identified through image recognition technology. The identification method of the impurity content is common knowledge in the field and will not be elaborated here.

[0043] The usage duration refers to the running duration of the air compressor from the time of replacement of the lubricating oil to the current moment. The usage duration can be obtained through a timer. The method for obtaining the usage duration is selected by the staff according to the actual situation and will not be elaborated here.

[0044] Step 106: Determine the reference content of the impurities according to the usage duration.

[0045] The reference content refers to the volume of impurities that the lubricating oil can deteriorate to produce after the usage duration under normal usage conditions. The reference content can be obtained by querying from the content relationship table. The content relationship table refers to the data table that records the different usage durations and their corresponding reference contents obtained through experiments in advance.

[0046] 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 the excessive impurities.

[0047] The impurity content being higher than the reference content means that the impurities in the lubricating oil are more than the impurities that the lubricating oil can normally deteriorate to produce, that is, the surface of the screw has been worn to cause the generation of metal particles. The excessive impurities refer to the difference between the impurity content and the reference content, and the content of metal particles generated by the screw wear is shown through the excessive impurities.

[0048] Step 108: Generate wear information based on the excessive impurities.

[0049] The display device refers to the equipment used to show information to the staff to present the working conditions of the air compressor. The display device is selected by the staff according to the actual situation and will not be elaborated here. The wear information refers to the information used to show the wear condition of the screw to the staff through the display device. The wear information can be in the form of a line graph of excessive impurities against time, or a pie chart of excessive impurities against impurity content. The generation method of the wear information is selected by the staff according to the actual situation and will not be elaborated here.

[0050] Step 109: Control a preset display device to give a warning according to the wear information.

[0051] When there is a situation of screw wear, judge the impurity condition in the lubricating oil from the appearance of the lubricating oil, thereby judge the metal particle content in the lubricating oil, and then evaluate the wear degree of the screw, and notify the staff through the display device of the wear degree for timely maintenance of the air compressor.

[0052] Refer to Figure 3 , the oil purification method includes: Step 110: When the impurity content is higher than the reference content, determine the oil volume according to the oil image.

[0053] The oil volume refers to the volume of the oil in the oil storage device. The oil volume can be determined by image recognition technology. The method for determining the oil volume is common knowledge in the art and will not be elaborated here.

[0054] Step 111: Determine the heating temperature according to the oil volume.

[0055] The 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 querying a temperature relationship table. The temperature relationship table refers to a data table recording different oil volumes and their corresponding heating temperatures.

[0056] Step 112: Control a preset oil storage device to heat the lubricating oil according to the heating temperature and update the oil image in real time.

[0057] While heating the lubricating oil through the oil storage device, feedback the appearance of the oil through the oil image to confirm the real-time quality condition of the oil.

[0058] Step 113: Determine the oil light transmittance according to the oil image.

[0059] The oil light transmittance refers to the percentage of the light flux of the light passing through the oil in the oil storage device changing with height to its incident light flux. The oil light transmittance can be determined by image recognition technology. The method for determining the oil light transmittance is common knowledge in the art and will not be elaborated here.

[0060] Step 114: When the light transmittance of the oil fluid is higher than a preset recovery threshold, determine the upper liquid level of the lubricating oil based on the oil fluid image.

[0061] The recovery threshold refers to the lowest light transmittance value of the lubricating oil that can be reused. The recovery threshold is selected by the staff according to the actual situation and will not be elaborated here. When the light transmittance of the oil fluid is higher than the recovery threshold, it means that the quality of the oil fluid is good, that is, the oil fluid in the oil storage device is stratified into lubricating oil fluid that can be recycled. The upper liquid level refers to the highest point of the oil fluid in the oil fluid image, and the upper liquid level can be determined by image recognition technology. The method for determining the upper liquid level is common knowledge in the field and will not be elaborated here.

[0062] Step 115: Control a preset recovery device to extract the oil fluid according to the upper liquid level.

[0063] The recovery device refers to a device used to extract the oil fluid for recycling. The recovery device is selected by the staff according to the actual situation and will not be elaborated here. When the oil fluid deteriorates severely, heat the oil fluid in the oil storage device to stratify the oil fluid, so that the severely deteriorated oil fluid precipitates, the oil fluid with a lower degree of deterioration floats, and the quality of the oil fluid is judged by the light transmittance of the oil fluid, so as to extract the oil fluid with a lower degree of deterioration and better quality for reuse.

[0064] Wherein, when there is still no oil fluid higher than the recovery threshold in the oil fluid image after a preset waiting time, pour out the oil fluid in the oil storage device and discard it, clean the inner wall of the oil storage device, and then inject the oil fluid in the recovery device 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.

[0065] Refer to Figure 4 , the wear treatment method includes: Step 200: When the impurity content is higher than the reference content, obtain the rotor image of the rotor.

[0066] The rotor image refers to a picture of the rotor in the air compressor. The rotor image can be obtained by a camera. The method for obtaining the rotor image is selected by the staff according to the actual situation and will not be elaborated here.

[0067] Step 201: Determine the wear position based on the rotor image.

[0068] The wear position refers to the position on the rotor where there are scratches or defects. The wear position can be determined by image recognition technology. The method for determining the wear position is common knowledge in the field and will not be elaborated here.

[0069] Step 202: Determine the wear degree based on the wear position.

[0070] The degree of wear refers to the value used to show the wear condition of the screw. When the scratches on the rotor are longer and deeper, and the defective area is larger, the degree of wear is greater. The degree of wear can be determined by image recognition technology. The method for determining the degree of wear is common knowledge for those skilled in the art and will not be elaborated here.

[0071] Step 203: Determine the lubricating oil quantity according to the degree of wear.

[0072] The lubricating oil quantity refers to the volume of lubricating oil sprayed to reduce the wear of the screw. The lubricating oil quantity can be obtained by querying from the oil quantity relationship table. The oil quantity relationship table is a data table that records the data of different degrees of wear and their corresponding lubricating oil quantities obtained through experiments in advance.

[0073] Step 204: Control the preset oil spraying device to spray oil on the worn position according to the lubricating oil quantity.

[0074] When the wear condition of the screw is relatively serious, identify the severely worn areas with obvious traces such as scratches from the appearance of the rotor, and spray lubricating oil on the severely worn areas emphatically, so as to reduce the further wear of the screw.

[0075] Refer to Figure 5 , the wear treatment method also includes: Step 205: Determine the reference impurity according to the degree of wear.

[0076] The reference impurity refers to the maximum volume of metal particles that the screw with the degree of wear can produce. The reference impurity can be obtained by querying from the impurity relationship table. The impurity relationship table is a data table that records the data of different degrees of wear and their corresponding reference impurities obtained through experiments in advance.

[0077] Step 206: When the excessive impurity is greater than the reference impurity, obtain the rotor temperature of the rotor evenly at multiple points.

[0078] The impurity content being greater than the reference impurity means that the volume of metal particles in the lubricating oil is greater than the maximum volume of metal particles that the screw with the degree of wear can produce. There are still many undetected minor worn areas on the screw. The rotor temperature refers to the temperature values of the rotor obtained evenly at the same time at intervals. The rotor temperature can be obtained through the temperature sensors evenly arranged on the rotor. The method for obtaining the rotor temperature is selected by the staff according to the actual situation and will not be elaborated here.

[0079] Step 207: Determine the rotor temperature distribution according to the rotor temperature.

[0080] The rotor temperature distribution refers to the temperature distribution area of the rotor. Since the material of the rotor is single and uniform, and the overall thermal conductivity of the rotor is the same, 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 for those skilled in the art and will not be elaborated here.

[0081] Step 208: Determine the abnormal position with abnormal temperature according to the rotor temperature distribution.

[0082] The abnormal position refers to the position on the rotor where heat generation is abnormal. The abnormal position can extract the peak value of the temperature from the rotor temperature distribution as the abnormal position. The method for determining the abnormal position is common knowledge for those skilled in the art and will not be elaborated here.

[0083] Step 209: Determine the missing position according to the abnormal position and the worn position.

[0084] The missing position refers to the set of position points obtained by removing the position points that are the same as the worn position in the missing position. The method for determining the missing position is common knowledge for those skilled in the art and will not be elaborated here.

[0085] Step 210: Generate an abnormal report according to the missing position.

[0086] The abnormal report refers to the information used to display the minor wear of the screw to the staff through a display device. The method for generating the abnormal report is common knowledge for those skilled in the art and will not be elaborated here.

[0087] Step 211: Control a preset display device to issue a warning according to the abnormal report.

[0088] Evaluate the volume of metal particles that can be generated at the severely worn area from the appearance of the rotor, and compare it with the metal particle content in the lubricating oil. When the volume of metal particles evaluated from the appearance of the rotor is much lower than the metal particle content in the lubricating oil, it means that there are multiple minor wear areas on the rotor. Extract the position with abnormal heat generation from the rotor temperature distribution as the minor wear area, and notify the staff for timely maintenance of the air compressor.

[0089] Refer to Figure 6 , the wear treatment method further includes: Step 212: Determine the missing temperature based on the missing position.

[0090] The missing temperature refers to the temperature value at the missing position in the rotor temperature distribution. The method for determining the missing position is common knowledge for those skilled in the art and will not be elaborated here.

[0091] Step 213: Determine the missing degree according to the missing temperature.

[0092] The missing degree refers to the wear degree value at the missing position. The missing degree can be obtained by querying from the degree relationship table, which refers to the relationship table recording different missing temperatures and their corresponding missing degrees.

[0093] Step 214: When the missing degree is higher than the preset influence threshold, determine the replacement coefficient according to the missing degree and the wear degree.

[0094] The influence threshold refers to the minimum degree of wear at which wear is likely to affect the overall structural strength of the screw. The influence threshold is selected by the staff according to the actual situation and will not be elaborated here. A leakage degree higher than the influence threshold indicates that the wear at the leakage location is likely to cause a decrease in the overall structural strength of the screw. The replacement coefficient is a value used to show the degree of damage to the entire rotor. The larger the values of the leakage degree and the wear degree, and the larger the quantity, the greater the replacement coefficient, and the higher the degree of damage to the rotor, the more necessary it is to replace the rotor. The method for determining the replacement coefficient is selected by the staff according to the actual situation and will not be elaborated here.

[0095] Step 215: When the replacement coefficient exceeds the preset replacement threshold, control the preset display device to issue a warning according to the replacement coefficient.

[0096] The replacement threshold refers to the maximum replacement coefficient at which the rotor must be replaced. The replacement threshold is selected by the staff according to the actual situation and will not be elaborated here. The replacement coefficient exceeding the replacement threshold indicates that the degree of damage to the rotor is relatively large at this time, and the rotor needs to be replaced immediately. A warning is issued through the display device to notify the staff to replace the rotor as soon as possible to reduce the further damage of the air compressor.

[0097] Evaluate the overall wear condition of the rotor from the wear conditions at the severely worn and slightly worn parts of the rotor, and determine that the rotor is difficult to continue to be used when the overall wear of the rotor is too high, so as to notify the staff to replace the rotor in a timely manner.

[0098] Refer to Figure 7 , the sealing treatment method includes: Step 300: When the impurity content is higher than the reference content, obtain the exhaust air pressure of the compressor.

[0099] The exhaust air pressure refers to the pressure value of the high-pressure gas output by the air compressor. The exhaust air pressure can be obtained through a pressure sensor. The method for obtaining the exhaust air pressure is selected by the staff according to the actual situation and will not be elaborated here.

[0100] Step 301: When the exhaust air pressure is lower than the preset output threshold, obtain the exhaust air volume of the compressor.

[0101] The output threshold refers to the minimum pressure value of the gas to be output by the air compressor. The output threshold is selected by the staff according to the actual situation and will not be elaborated here. The exhaust air pressure being lower than the output threshold indicates that the pressure of the gas output by the air compressor is insufficient. The exhaust air volume refers to the volume of the high-pressure gas output by the air compressor per unit time. The method for obtaining the exhaust air volume is selected by the staff according to the actual situation and will not be elaborated here.

[0102] Step 302: Determine the reference air volume according to the exhaust air pressure and the exhaust air volume.

[0103] The reference gas volume refers to the exhaust gas pressure, exhaust gas volume, and the volume value of the gas under normal pressure. The method for determining the reference gas volume is common knowledge to those skilled in the art and will not be elaborated here.

[0104] Step 303: Calculate the quotient of the reference gas volume and the preset intake gas volume, and define it as the loss ratio.

[0105] The intake gas volume refers to the volume of air inhaled by an air compressor per unit time. The intake gas volume is selected by the staff according to the actual situation and will not be elaborated here. The loss ratio refers to the quotient of the reference gas volume and the intake gas volume, and the leakage situation of the gas during the air compression process is shown through the loss ratio.

[0106] Step 304: Calculate the quotient of the preset intake gas volume and the loss ratio, and define it as the corrected gas volume.

[0107] The corrected gas volume refers to the quotient of the intake gas volume and the loss ratio, and the volume value of the air that needs to be inhaled to obtain compressed air with the intake gas volume under the leakage condition of the loss ratio is shown through the corrected gas volume.

[0108] Step 305: Control the preset compressor to increase the inhaled air according to the corrected gas volume.

[0109] When the rotor is worn, it is easy to cause the sealing performance of the rotor to decline, resulting in a situation where the pressure value of the high-pressure gas output by the air compressor decreases. Detect the pressure value of the high-pressure gas, and increase the gas inhaled by the air compressor when the pressure value is too low, so as to increase the pressure of the gas output by the air compressor.

[0110] Refer to Figure 8 , the sealing treatment method also includes: Step 306: When the corrected gas volume exceeds the preset correction threshold, determine the high-temperature position according to the rotor temperature distribution.

[0111] The correction threshold refers to the maximum gas volume value that an air compressor can inhale per unit time. The correction threshold is selected by the staff according to the actual situation and will not be elaborated here. The corrected gas volume exceeding the correction threshold means that the gas volume required to be inhaled by the air compressor is too large, and it is difficult for the air compressor to provide sufficient air in time. The high-temperature position refers to the position point with the highest temperature in the rotor temperature distribution. The method for determining the high-temperature position is common knowledge to those skilled in the art and will not be elaborated here.

[0112] Step 307: Determine the high-temperature temperature based on the high-temperature position.

[0113] The high-temperature temperature refers to the temperature value of the rotor at the high-temperature position. The method for determining the high-temperature temperature is common knowledge to those skilled in the art and will not be elaborated here.

[0114] Step 308: Determine the cooling air volume according to the high-temperature temperature.

[0115] The cooling air volume refers to the volume of air required by the screw for reducing the high temperature per unit time. The cooling air volume can be obtained by querying from the cooling relationship table, which is a data table recording different high temperatures and their corresponding cooling air volumes.

[0116] Step 309: Control the preset cooling device to move to the high-temperature position and blow air 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.

[0117] When the volume of gas to be inhaled by the air compressor is large, a part of the gas is directly blown towards the screw inside the air compressor through the cooling device, so as to reduce the temperature of the screw without affecting the gas compression ratio.

[0118] Based on the same inventive concept, an embodiment of the present invention provides an oil injection control system for a screw air compressor, including: An acquisition module, configured to acquire the exhaust temperature, oil image, usage duration, rotor image, rotor temperature, exhaust air pressure, and exhaust air volume; A memory, configured to store any one of the above-mentioned oil injection control methods for a screw air compressor; A processor, and the program in the memory can be loaded and executed by the processor.

[0119] Based on the same inventive concept, an embodiment of the present invention provides an intelligent terminal, including a memory and a processor, and a program capable of being loaded and executed by the processor is stored on the memory, which is any one of the above-mentioned oil injection control methods for a screw air compressor.

[0120] Those skilled in the art can clearly understand that for the convenience and brevity of description, only the above division of each functional module is used as an example. In practical applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working processes of the above-described system, device, and unit can refer to the corresponding processes in the foregoing method embodiments, and will not be described in detail here.

[0121] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An oil injection control method for a screw air compressor, characterized in that, Including: Obtain the exhaust temperature of the compressor; 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; Determine the lubrication increment according to the exhaust temperature difference; Control the preset oil injection device to increase the oil injection volume according to the lubrication increment.

2. The oil injection control method of a screw air compressor according to claim 1, characterized in that, Also including: 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 the oil liquid image from the other side of the preset oil storage device; Determine the impurity content according to the oil liquid image, and obtain the service life of the lubricating oil; Determine the reference content of impurities according to the service life; 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 the excessive impurities; Generate wear information according to the excessive impurities; Control the preset display device to issue a warning according to the wear information.

3. The oil injection control method of a screw air compressor according to claim 2, characterized in that Also including an oil liquid purification method, the oil liquid purification method includes: When the impurity content is higher than the reference content, determine the oil liquid volume according to the oil liquid image; Determine the heating temperature according to the oil liquid volume; Control the preset oil storage device to heat the lubricating oil according to the heating temperature, and update the oil liquid image in real time; Determine the oil liquid transmittance according to the oil liquid image; When the oil liquid transmittance is higher than the preset recovery threshold, determine the upper liquid level of the lubricating oil according to the oil liquid image; Control the preset recovery device to extract the oil liquid according to the upper liquid level.

4. A fuel injection control method for a screw air compressor according to claim 2, characterized in that Also including a wear treatment method, the wear treatment method includes: When the impurity content is higher than the reference content, obtain the rotor image of the rotor; Determine the wear position according to the rotor image; Determine the wear degree based on the wear position; Determine the lubricating oil quantity according to the wear degree; Control the preset oil injection device to inject oil at the wear position according to the lubricating oil quantity.

5. A method for controlling oil injection of a screw air compressor according to claim 4, characterized in that, The wear treatment method also includes: Determine the reference impurities according to the wear degree; When the excessive impurities are greater than the reference impurities, obtain the rotor temperature of the rotor evenly at multiple points; Determine the rotor temperature distribution according to the rotor temperature; Determine the abnormal position with abnormal temperature according to the rotor temperature distribution; Determine the missing position according to the abnormal position and the wear position; Generate an abnormal report according to the missing position; Control the preset display device to issue a warning according to the abnormal report.

6. A fuel injection control method for a screw air compressor according to claim 5, characterized in that, The wear treatment method also includes: Determine the missing temperature based on the missing position; Determine the missing degree according to the missing temperature; When the missing degree is higher than the preset influence threshold, determine the replacement coefficient according to the missing degree and the wear degree; When the replacement coefficient exceeds the preset replacement threshold, control the preset display device to issue a warning according to the replacement coefficient.

7. A fuel injection control method for a screw air compressor according to claim 6, characterized in that Also including a sealing treatment method, the sealing treatment method includes: When the impurity content is higher than the reference content, obtain the exhaust gas pressure of the compressor; When the exhaust gas pressure is lower than the preset output threshold, obtain the exhaust gas volume of the compressor; Determine the reference gas volume according to the exhaust gas pressure and the exhaust gas volume; Calculate the quotient of the reference gas volume and the preset intake gas volume, and define it as the loss ratio; Calculate the quotient of the preset intake gas volume and the loss ratio, and define it as the corrected gas volume; Control the preset compressor to increase the intake air according to the corrected gas volume.

8. A method for controlling oil injection of a screw air compressor according to claim 7, characterized in that, The sealing treatment method also includes: When the corrected gas volume exceeds the preset correction threshold, determine the high-temperature position according to the rotor temperature distribution; Determine the 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 air 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.

9. An oil injection control system for a screw air compressor, characterized in that, Comprising: An acquisition module, configured to acquire the exhaust temperature, oil image, usage duration, rotor image, rotor temperature, exhaust air pressure, and exhaust air volume; A memory, configured to store a screw air compressor oil injection control method according to any one of claims 1 to 8; A processor, and the program in the memory can be loaded and executed by the processor.

10. An intelligent terminal, characterized in that, Comprising a memory and a processor, and stored on the memory is a screw air compressor oil injection control method that can be loaded and executed by the processor according to any one of claims 1 to 8.

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