Dual-logic Temperature and Pressure Dynamic Monitoring Method

Abstract

The present invention relates to the field of screw air compressors, and specifically discloses a dual-logic temperature and pressure dynamic monitoring method, including a pressure sensor. The pressure sensor acquires the pressure P1 at the exhaust port of the main engine, the pressure P2 in the exhaust pipe, the pressure P3 at the inlet of the separation barrel, the pressure P4 inside the separation barrel, the pressure P5 of the gas before separation, and the pressure P6 of the gas after separation. First, it is detected whether it meets the hard logic of P1≥P2≥P3≥P4≥P5≥P6. If it does not meet, the machine is immediately stopped and an alarm is given. The preset differences between P1 and P2, P2 and P3, P3 and P4, P4 and P5, P5 and P6 under normal operating conditions are X1, X2, X3, X4, X5, X6 respectively. Then, it is detected whether their relationship meets the soft logic of P1−P2>X1, P2−P3>X2, P3−P4>X3, P4−P5>X4, P5−P6>X5. If it does not meet, the machine is immediately stopped and an alarm is given. Through the automatic adjustment of the soft logic and the automatic alarm and shutdown of the hard logic, the present invention better realizes the monitoring of the screw air compressor, enabling the inspector to better replace the corresponding accessories and check the usage conditions of each accessory.

Description

Technical Field

[0001] The present invention relates to the field of screw air compressors, and particularly to a dual-logic temperature and pressure dynamic monitoring method for screw air compressors. Background Art

[0002] Screw air compressors adopt a pre-packaged configuration. Screw air compressors only require a single power connection and compressed air connection, and are equipped with a built-in cooling system, which greatly simplifies the installation work. Screw air compressors have always provided high-quality compressed air for all walks of life with their advantages of high efficiency, high productivity, maintenance-free, and high reliability.

[0003] In addition to the hardware facilities, the standard configuration of screw air compressors also needs to be equipped with a complete detection system for detecting the temperature and pressure conditions inside the screw air compressor for adjustment at any time. However, the detection systems on the market currently only perform single or partial data collection, and the entire test system does not have processing logic and self-calibration capabilities, resulting in a longer time to detect problems during data collection and control, thereby reducing the efficiency of troubleshooting.

[0004] The technical problem to be solved by this application is: how to detect the temperature condition inside the screw air compressor more efficiently and accurately and automatically adjust it. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a dual-logic temperature and pressure dynamic monitoring method with high efficiency and high accuracy.

[0006] The technical solution adopted by the present invention is: a dual-logic temperature and pressure dynamic monitoring method, including a temperature sensor, a pressure sensor, and a main control module provided on the screw air compressor:

[0007] The pressure detection soft logic of the main control module is:

[0008] Collect pressure values: The pressure sensor obtains the main engine exhaust port pressure P1, the exhaust pipe pressure P2, the separator inlet pressure P3, the internal pressure P4 of the separator, the gas pressure P5 before separation, and the gas pressure P6 after separation;

[0009] Detect pressure values: Preset that the differences between P1 and P2, P2 and P3, P3 and P4, P4 and P5, P5 and P6 under normal operating conditions are X1, X2, X3, X4, X5, X6 respectively, and judge whether P1 - P2 > X1, P2 - P3 > X2, P3 - P4 > X3, P4 - P5 > X4, P5 - P6 > X5 are satisfied under the actual operating state. If not, stop the machine and alarm;

[0010] The temperature detection soft logic of the main control module is:

[0011] Collect temperature values: The temperature sensor obtains the temperature T1 of the main engine head, the temperature T2 of the main engine head displayed by the controller, the temperature T3 of the main engine fuel injection, the temperature T4 at the inlet of the oil-cooled motor, the temperature T5 at the outlet of the oil-cooled motor, and the temperature T6 at the inlet of the main engine;

[0012] Detect temperature values: Preset the differences between T1 and T2, T2 and T3, T3 and T4, T4 and T5, T5 and T6 in the normal operating state as Y1, Y2, Y3, Y4, Y5, Y6 respectively, and determine whether T1 - T2 > Y1, T2 - T3 > Y2, T3 - T4 > Y3, T4 - T5 > Y4, T5 - T6 > Y5 are satisfied in the actual operating state. If not, stop the machine and give an alarm.

[0013] In some embodiments, the pressure detection hard logic of the main control module is:

[0014] Pressure fault troubleshooting: Determine whether each pressure satisfies the hard logic of P1 ≥ P2 ≥ P3 ≥ P4 ≥ P5 ≥ P6. If not, stop the machine and give an alarm.

[0015] In some embodiments, the temperature detection hard logic of the main control module is:

[0016] Temperature fault troubleshooting: Determine whether each temperature satisfies the hard logic of T1 ≥ T2 ≥ T3 ≥ T4 ≥ T5 ≥ T6. If not, stop the machine and give an alarm.

[0017] In some embodiments, a pressure sensor is also provided at the interface between the screw air compressor and the rear-end equipment to real-time detect the pressure value P7 inside the interface, and preset the pressure value inside the interface to be P8 in the normal state:

[0018] Compare pressure values: Detect the magnitude relationship between P7 and P8;

[0019] Abnormal handling method: If P7 is less than P8, the motor runs at the maximum speed until P7 equals P8. If P7 is greater than P8, the motor reduces its speed until P7 equals P8.

[0020] In some embodiments, a temperature sensor is also provided at the interface between the screw air compressor and the rear-end equipment to real-time detect the temperature value T7 inside the interface, and preset the temperature value inside the interface to be T8 in the normal state:

[0021] Compare temperature values: Detect the magnitude relationship between T7 and T8;

[0022] Abnormal handling method: If T7 is less than T8, the motor reduces its speed until T7 equals T8. If T7 is greater than T8, continue to run.

[0023] In some embodiments, the main control module further includes multi-channel temperature hard logic:

[0024] Multi-channel temperature detection: A water temperature detector is set inside the host to detect the water temperature PT1, and an oil temperature detector is set inside the host to detect the oil temperature PT2;

[0025] Compare multi-channel temperatures: Determine the magnitudes of PT1 and PT2. If PT1 > PT2, it is regarded as an abnormal working condition and an alarm is given.

[0026] In some embodiments, the main control module is provided with a display screen connected to it for data. The display screen is provided with a communication module connected to it for communication. The communication module is respectively provided with a pressure input module and a temperature input module on both sides of it.

[0027] In some embodiments, the pressure input module and the temperature input module are in parallel. The pressure input module is connected to a pressure sensor for data, and the temperature input module is connected to a temperature sensor for data.

[0028] The beneficial effects of the present invention are as follows:

[0029] Through the detection of the overall screw air compressor, this dual-logic temperature and pressure dynamic monitoring method combines software and hardware. At the same time, it adopts the method of setting automatic adjustment of soft logic and automatic alarm and shutdown of hard logic on the software to better achieve the monitoring of the screw air compressor, realize intelligent control, and enable the inspector to better replace the corresponding accessories and check the usage conditions of each accessory. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the hardware structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the pressure detection process of the present invention;

[0032] Figure 3 It is a schematic diagram of the temperature detection process of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figure 1, the present invention provides a technical solution: a dual-logic temperature and pressure dynamic monitoring method, including a main control module. The main control module is data-connected to a display screen, and the display screen is communicatively connected to a communication module. The communication module is respectively connected in parallel with a temperature input module and a pressure input module. The temperature input module is data-connected to a temperature sensor, and the pressure input module is data-connected to a pressure sensor. A plurality of temperature sensors are provided and installed on a screw air compressor respectively.

[0035] The pressure sensor is used to obtain the main engine exhaust port pressure P1, the exhaust pipe pressure P2, the separator inlet pressure P3, the separator internal pressure P4, the gas pressure before separation P5, and the gas pressure after separation P6, and transmit the above pressure values to the pressure input module and perform data analysis under the control of the main control module, and present the analysis result on the display screen. Similarly, the temperature sensor is used to obtain the main engine head temperature T1, the controller displays the main engine head temperature T2, the main engine oil injection temperature T3, the oil-cooled motor inlet temperature T4, the oil-cooled motor outlet temperature T5, and the main engine inlet temperature T6, and transmit the above temperature values to the temperature input module and perform data analysis under the control of the main control module, and present the analysis result on the display screen.

[0036] Please refer to Figure 2 , the process of the main control module analyzing the pressure value is as follows:

[0037] A1: Detect whether the relationship between P1, P2, P3, P4, P5, and P6 satisfies the hard logic of P1≥P2≥P3≥P4≥P5≥P6. If not, immediately stop the machine and alarm. If so, enter the next detection link;

[0038] A2: First, preset the differences between P1 and P2, P2 and P3, P3 and P4, P4 and P5, P5 and P6 in the normal operation state as X1, X2, X3, X4, X5, X6 respectively, and then detect whether the relationship between P1, P2, P3, P4, P5, and P6 satisfies the soft logic of P1 - P2 > X1, P2 - P3 > X2, P3 - P4 > X3, P4 - P5 > X4, P5 - P6 > X5. If satisfied, continue to run. If not, immediately stop the machine and alarm.

[0039] Since the pressure transfer process is hierarchical, there is a loss in the pressure value during the transfer from the upper level to the lower level. However, if the sealing is good enough, the pressure values can be equal. Therefore, when it is illogical, that is, the pressure has no loss but increases, it indicates that there is an abnormality in a certain section in the middle, which obviously does not meet the requirements of hard logic. The inspector can check for faults and reasons based on historical records; when it does not meet the soft logic of P1 - P2 > X1, P2 - P3 > X2, P3 - P4 > X3, P4 - P5 > X4, P5 - P6 > X5, the inspector can quickly and accurately determine the abnormal location based on the abnormality of a specific value, and replace the corresponding accessories in time and check the usage of each accessory.

[0040] When the pressure value in the screw air compressor is normal, an additional pressure detector is set on the connecting pipeline between the rear-end equipment and the screw air compressor to detect the pressure value P7 in the pipeline, and the pressure value in the normal state is set as P8 for output feedback and automatic adjustment of the pressure value. If P7 is less than P8, the motor runs at the maximum speed until P7 is equal to P8. If P7 is greater than P8, the motor reduces its speed until P7 is equal to P8.

[0041] Please refer to Figure 3 , the process of the main control module analyzing the temperature value is as follows:

[0042] B1: Detect whether the relationship between T1, T2, T3, T4, T5, and T6 satisfies the hard logic of T1≥T2≥T3≥T4≥T5≥T6. If not, stop the machine immediately and alarm. If so, enter the next detection link.

[0043] B2: First, preset the differences between T1 and T2, T2 and T3, T3 and T4, T4 and T5, T5 and T6 in the normal operating state as Y1, Y2, Y3, Y4, Y5, Y6 respectively. Then, detect whether the relationship between T1, T2, T3, T4, T5, and T6 satisfies the soft logic of T1 - T2 > Y1, T2 - T3 > Y2, T3 - T4 > Y3, T4 - T5 > Y4, T5 - T6 > Y5. If so, continue to run. If not, stop the machine immediately and alarm.

[0044] Similarly, since the temperature transfer process is hierarchical, there is loss in the temperature value when it is transferred from the upper level to the lower level. However, if the sealing is good enough, the temperature value can be equal. Therefore, when it is illogical, that is, the pressure increases without loss, it means that there is an abnormality in a certain section in the middle, which obviously does not meet the requirements of hard logic. The inspector can check the fault and cause according to the historical records; when it does not meet the soft logic of T1-T2>Y1, T2-T3>Y2, T3-T4>Y3, T4-T5>Y4, T5-T6>Y5, the inspector can quickly and accurately determine the abnormal location according to the abnormality of a specific value, replace the corresponding accessories in time and check the use of each accessory.

[0045] If the temperature value in the screw air compressor is normal, an additional temperature detector is provided on the connecting pipeline between the rear-end equipment and the screw air compressor to detect the temperature value T7 in the pipeline and set the temperature value under normal conditions to T8 for output feedback and automatic adjustment of the temperature value. If T7 is less than T8, the motor reduces the speed until T7 is equal to T8. If T7 is greater than T8, the motor continues to run.

[0046] The main control module also includes multi-channel temperature hard logic. First, a water temperature detector is set in the main engine to detect the water temperature PT1, and an oil temperature detector is set in the main engine to detect the oil temperature PT2. Then the size of PT1 and PT2 is judged. If PT1>PT2, it is regarded as an abnormal operating condition and an alarm is issued.

[0047] The following detection examples are provided:

[0048] The rated frequency and speed of the machine with a conventional pressure value of 0.8Mpa are 100Hz and 1500r / min respectively. When the rear-end set pressure is 0.8Mpa and the detected pressure is consistent with 0.8Mpa, the main control system will keep running at the current frequency, that is, the speed; when the setting is 0.8Mpa, which is greater than the detected pressure value, the control system will run at the rated 100Hz and 1500r / min of the motor until the set pressure of 0.8Mpa is reached; when the set pressure of 0.8Mpa is less than the detected pressure value, which is greater than or equal to 0.6Mpa and less than or equal to 0.8Mpa, the control system will reduce the frequency of the motor, that is, the speed operation is adjusted according to the actual pressure difference according to 10% of the speed, and then fine-tuned by 1% to meet the current set pressure value of 0.8Mpa; when the rear-end pressure is lower than 0.6Mpa for 120 seconds, the whole machine will enter the dormant state; when the rear-end pressure demand is higher than 0.6Mpa, the whole machine will be released from the dormant state and enter the working state.

[0049] Since the temperature of the compressed air is 10°C higher than the ambient temperature, the maximum intake air temperature of the refrigerant dryer will be 30 + 10 = 40°C, when the flow rate FAD 7bar(e) = 450l / s. Additionally, the required pressure dew point is +5°C; when the maximum ambient temperature is 30°C, the correction factor can reach 0.95. Therefore, by multiplying by the above correction factor, the refrigerant dryer should be able to handle the full load of the compressor. 450 x 0.95 x 1.0 x 0.95 = 406l / s. So when the set temperature is greater than or equal to the detected temperature value, the main control system will operate according to the current load; when the set temperature is less than the detected temperature value, the main control system will remind and give an early warning about the need to pay attention to the service life and selection of the refrigerant dryer.

[0050] Finally, it should be noted that the above are only preferred examples of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Dual-logic temperature and pressure dynamic monitoring method, characterized in that, Including a temperature sensor, a pressure sensor and a main control module provided on a screw air compressor: The pressure detection soft logic of the main control module is as follows: Collect pressure values: The pressure sensor obtains the main engine exhaust port pressure P1, the exhaust pipe pressure P2, the separator inlet pressure P3, the separator internal pressure P4, the pre-separation gas pressure P5 and the post-separation gas pressure P6; Detect pressure values: Preset the differences between P1 and P2, P2 and P3, P3 and P4, P4 and P5, P5 and P6 in the normal operating state as X1, X2, X3, X4, X5 respectively, and judge whether P1 - P2 > X1, P2 - P3 > X2, P3 - P4 > X3, P4 - P5 > X4, P5 - P6 > X5 are satisfied in the actual operating state. If not, stop the machine and alarm; The pressure detection hard logic of the main control module is as follows: Pressure fault troubleshooting: Judge whether each pressure satisfies the hard logic of P1≥P2≥P3≥P4≥P5≥P6. If not, stop the machine and alarm; The temperature detection soft logic of the main control module is as follows: Collect temperature values: The temperature sensor obtains the main engine head temperature T1, the controller displays the main engine head temperature T2, the main engine oil injection temperature T3, the oil-cooled motor inlet temperature T4, the oil-cooled motor outlet temperature T5 and the main engine inlet temperature T6; Detect temperature values: Preset the differences between T1 and T2, T2 and T3, T3 and T4, T4 and T5, T5 and T6 in the normal operating state as Y1, Y2, Y3, Y4, Y5 respectively, and judge whether T1 - T2 > Y1, T2 - T3 > Y2, T3 - T4 > Y3, T4 - T5 > Y4, T5 - T6 > Y5 are satisfied in the actual operating state. If not, stop the machine and alarm; The temperature detection hard logic of the main control module is as follows: Temperature fault troubleshooting: Judge whether each temperature satisfies the hard logic of T1≥T2≥T3≥T4≥T5≥T6. If not, stop the machine and alarm.

2. The dual-logic temperature and pressure dynamic monitoring method according to claim 1, wherein The pressure sensor is also set at the interface between the screw air compressor and the rear-end equipment to obtain the pressure value P7 inside the interface in real time, and preset the pressure value inside the interface to be P8 in the normal state: Compare pressure values: Detect the magnitude relationship between P7 and P8; Abnormal handling method: If P7 is less than P8, the motor runs at the maximum speed until P7 is equal to P8. If P7 is greater than P8, the motor reduces the speed until P7 is equal to P8.

3. The dual-logic temperature and pressure dynamic monitoring method according to claim 1, wherein The temperature sensor is also set at the interface between the screw air compressor and the rear-end equipment to detect the temperature value T7 inside the interface in real time, and preset the temperature value inside the interface to be T8 in the normal state: Compare temperature values: Detect the magnitude relationship between T7 and T8; Abnormal handling method: If T7 is less than T8, the motor reduces the speed until T7 is equal to T8. If T7 is greater than T8, continue to run.

4. The dual-logic temperature and pressure dynamic monitoring method according to claim 3, wherein The main control module also includes multi-channel temperature hard logic: Multi-channel temperature detection: Set a water temperature detector in the main engine to detect the water temperature PT1, and set an oil temperature detector in the main engine to detect the oil temperature PT2; Compare multi-channel temperatures: Judge the magnitude of PT1 and PT2. If PT1 > PT2, it is regarded as an abnormal working condition and alarm.

5. The dual-logic temperature and pressure dynamic monitoring method according to any one of claims 1 to 4, characterized in that The main control module is provided with a display screen that is data-connected thereto. The display screen is provided with a communication module that is communicatively connected thereto. The communication module is respectively provided with a pressure input module and a temperature input module on both sides thereof.

6. The dual-logic temperature and pressure dynamic monitoring method according to claim 5, characterized in that The pressure input module and the temperature input module are in parallel. The pressure input module is data-connected to a pressure sensor, and the temperature input module is data-connected to a temperature sensor.

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