Air compressor and control method, device and equipment thereof, and storage medium

Abstract

The application discloses an air compressor and a control method, device and equipment thereof and a storage medium, and relates to the technical field of air compressors. The air compressor comprises an air compressor main body, a driver, a current acquisition device, an air inlet channel, an air outlet channel, a secondary air outlet pipe and a control unit. The driver drives the air compressor main body to operate. The current acquisition device acquires a current signal of the driver. The air inlet channel and the air outlet channel are connected with the air compressor main body. The air inlet channel is provided with a flow meter and a gas cooling device. The air outlet channel is provided with an electric valve. The secondary air outlet pipe is arranged in the air outlet channel. The secondary air outlet pipe is provided with a pressure reducing valve. The control method comprises the following steps: acquiring a current signal change curve of the flow meter and the current acquisition device; performing time domain analysis on the current signal change curve to determine whether the air compressor enters a surge state; and if the air compressor enters the surge state, at least one control action of turning on the gas cooling device, turning on the pressure reducing valve and increasing the opening degree of the electric valve is performed. The application avoids the air compressor in a surge state and improves stability.

Description

Technical Field

[0001] This invention relates to the field of air compression technology, and in particular to an air compressor and its control method, apparatus, equipment and storage medium. Background Technology

[0002] Air compressors (abbreviated as "air compressors") are used to provide air power and are the core equipment of pneumatic systems. Currently, air compressors are widely used in various industries, becoming one of the core devices in the equipment of related enterprises. Therefore, fault detection of air compressors is crucial for the production and maintenance of core equipment in enterprises. Surge detection is a very important part of air compressor fault detection. Air compressor surge refers to the low-frequency (usually only a few hertz or tens of hertz), high-amplitude (strong pressure and flow fluctuations) airflow oscillation along the air compressor's axis. This low-frequency, high-amplitude airflow oscillation is a significant source of excitation force, which can cause strong mechanical vibration and overheating of the air compressor components, leading to serious damage to components in a very short time. Therefore, air compressors must never operate in the surge zone under any circumstances. Summary of the Invention

[0003] This invention provides an air compressor and its control method, device, equipment, and storage medium, aiming to solve the problem of air compressor component damage caused by surge in existing air compressors.

[0004] In a first aspect, embodiments of the present invention provide an air compressor, comprising: an air compression unit, an intake passage, an exhaust passage, a secondary exhaust pipe, and a control unit. The air compression unit includes an air compressor body, a driver, and a current acquisition device. The driver is connected to the air compressor body, and the current acquisition device is connected to the driver. The intake passage is connected to the intake port of the air compressor body, and the intake passage is provided with a flow meter for acquiring the intake air volume and a gas cooling device. The exhaust passage is connected to the exhaust port of the air compressor body, and the exhaust passage is provided with a device for controlling the exhaust pressure and intake air volume. An electric valve for controlling flow rate; a secondary exhaust pipe located on the exhaust side of the exhaust channel, the secondary exhaust pipe having a pressure reducing valve for controlling the opening and closing of the secondary exhaust pipe; a control unit connected to the flow meter, the current acquisition device, the gas cooling device, the pressure reducing valve, and the electric valve; wherein, the control unit is used to acquire the current signals of the flow meter and the current acquisition device to monitor whether the air compressor enters a surge state, and when the air compressor enters a surge state, executes at least one of the following control actions: opening the gas cooling device, opening the pressure reducing valve, and increasing the opening degree of the electric valve.

[0005] In the air compressor provided in the embodiments of the present invention, the air compression unit further includes a controller and a voltage regulator, the controller being connected to the driver, and the voltage regulator being connected to the controller.

[0006] In the air compressor provided in the embodiments of the present invention, the air compressor further includes an air filter, which is disposed on the air intake side of the air intake channel; and / or the air compressor further includes a gas buffer device, which is disposed on the air intake channel.

[0007] Secondly, embodiments of the present invention also provide a control method for an air compressor, applied to the air compressor described in the first aspect. The control method includes: acquiring current signal change curves of a flow meter and a current acquisition device; performing time-domain analysis on the current signal change curves to determine whether the air compressor has entered a surge state; if the air compressor enters a surge state, then performing at least one of the following control actions: turning on the gas cooling device, opening the pressure reducing valve, and increasing the opening degree of the electric valve.

[0008] Thirdly, embodiments of the present invention also provide a control device for an air compressor, comprising: an acquisition unit for acquiring current signal change curves of a flow meter and a current acquisition device; a judgment unit for performing time-domain analysis on the current signal change curves to determine whether the air compressor has entered a surge state; and a control unit for controlling the gas cooling device to open, the pressure reducing valve to conduct, and the opening degree of the electric valve to increase if the air compressor enters a surge state.

[0009] Fourthly, embodiments of the present invention also provide a computer device, the computer device including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method as described in the second aspect.

[0010] Fifthly, embodiments of the present invention also provide a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the above-described method.

[0011] This invention provides an air compressor and its control method, apparatus, device, and storage medium. The air compressor includes an air compressor body, a driver, a current acquisition device, an intake channel, an exhaust channel, a secondary exhaust pipe, and a control unit. The driver drives the air compressor body to operate. The current acquisition device acquires the current signal from the driver. The intake channel and exhaust channel are connected to the air compressor body. The intake channel is equipped with a flow meter and a gas cooling device. The exhaust channel is equipped with an electric valve. The secondary exhaust pipe is located in the exhaust channel and is equipped with a pressure reducing valve. The control unit monitors whether the air compressor has entered a surge state by acquiring the current signals from the current acquisition device and the flow meter. If the air compressor is in a surge state, the gas cooling device is activated, the pressure reducing valve is opened, and the opening of the electric valve is increased to increase the intake air volume and reduce the intake air temperature. The control method includes: acquiring the current signal change curves from the flow meter and the current acquisition device; performing time-domain analysis on the current signal change curves to determine whether the air compressor has entered a surge state; if the air compressor has entered a surge state, executing at least one of the following control actions: activating the gas cooling device, opening the pressure reducing valve, and increasing the opening of the electric valve. The technical solution of this invention analyzes the current signal change curves corresponding to the current acquisition device and the flow meter in the time domain to identify whether the air compressor has entered a surge state. If the air compressor is in a surge state, the gas cooling device is turned on, the pressure reducing valve is opened, and the opening of the electric valve is increased. The three work together to form an anti-surge system, ensuring the continuity and stability of the air compressor's operating state, avoiding damage to the air compressor components, and improving the service life of the air compressor. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A schematic diagram of an air compressor provided in an embodiment of the present invention;

[0014] Figure 2 This is a flowchart illustrating the control method for an air compressor provided in an embodiment of the present invention;

[0015] Figure 3 A flowchart illustrating the sub-steps of the air compressor control method provided in an embodiment of the present invention;

[0016] Figure 4 A flowchart illustrating the sub-steps of the air compressor control method provided in an embodiment of the present invention;

[0017] Figure 5A flowchart illustrating the sub-steps of the air compressor control method provided in an embodiment of the present invention;

[0018] Figure 6 A schematic block diagram of a control device for an air compressor provided in an embodiment of the present invention; and

[0019] Figure 7 A schematic block diagram of a computer device provided in an embodiment of the present invention;

[0020] Figure label:

[0021] 1. Air compressor body; 11. Driver; 12. Current acquisition device; 13. Controller; 14. Voltage regulator; 2. Inlet passage; 21. Flow meter; 22. Gas cooling device; 23. Air filter; 24. Gas buffer device; 3. Exhaust passage; 31. Electric valve; 4. Secondary exhaust pipe; 41. Pressure reducing valve. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0024] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0026] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrases "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0027] Please see Figure 1 , Figure 1 This is a schematic diagram of an air compressor provided in an embodiment of the present invention. Figure 1 As shown, the air compressor includes: an air compression unit, an intake channel 2, an exhaust channel 3, a secondary exhaust pipe 4, and a control unit. The air compression unit includes an air compressor body 1, a driver 11, and a current acquisition device 12. The driver 11 is connected to the air compressor body 1, and the current acquisition device 12 is connected to the driver 11. The intake channel 2 is connected to the air inlet of the air compressor body 1, and the intake channel 2 is equipped with a flow meter 21 for collecting the intake airflow and a gas cooling device 22. The exhaust channel 3 is connected to the exhaust port of the air compressor body 1, and the exhaust channel 3 is equipped with an electric valve 31 for controlling the exhaust pressure and intake airflow. A secondary exhaust pipe 4 is located on the exhaust side of the exhaust channel 3, and a pressure reducing valve 41 is provided on the secondary exhaust pipe 4 to control the opening and closing of the secondary exhaust pipe 4; a control unit is connected to the flow meter 21, the current acquisition device 12, the gas cooling device 22, the pressure reducing valve 41, and the electric valve 31; wherein, the control unit is used to acquire the current signals of the flow meter 21 and the current acquisition device 12 to monitor whether the air compressor enters a surge state, and when the air compressor enters a surge state, it executes at least one of the following control actions: opening the gas cooling device 22, opening the pressure reducing valve 41, and increasing the opening degree of the electric valve 31.

[0028] Specifically, the air compressor body 1 is the component that compresses air, and it has an air inlet and an air outlet. The air inlet is connected to the air intake channel 2, and the air outlet is connected to the air exhaust channel 3. Both the air intake channel 2 and the air exhaust channel 3 are channels composed of pipes. The driver 11 drives the air compressor to operate. The driver 11 can be, for example, a drive circuit. The current acquisition device 12 acquires the current of the driver 11, for example, an analog front-end chip. Since the driver 11 drives the air compressor body 1, the stability of the current signal of the driver 11 is related to the stability of the air compressor's operation. By evaluating the current signal of the driver 11, it is possible to identify whether the air compressor is in a surge condition. The advantage of choosing the current signal of the driver 11 to identify surge is less interference and higher accuracy. Compared with flow sensors and temperature sensors to identify airflow parameters, since air compressors are usually used in various complex and harsh industrial environments with many impurities in the air and various unstable factors, the signals acquired by the sensors are easily interfered with. However, using the current signal of the driver 11 for identification avoids external interference, and the electrical signal is relatively more stable, less prone to errors, and avoids misjudgment. In addition, a flow meter 21 is installed in the intake channel 2 to collect the intake air flow rate in the intake channel 2. An electric valve 31 is installed on the exhaust side of the exhaust channel 3. The electric valve 31 controls the exhaust pressure of the exhaust channel 3 and the intake air flow rate of the intake channel 2 by controlling its opening degree. When the opening degree of the electric valve 31 increases, the exhaust pressure decreases and the intake air flow rate increases; conversely, when the opening degree of the electric valve 31 decreases, the exhaust pressure increases and the intake air flow rate decreases. A secondary exhaust pipe 4 is installed on the exhaust side of the exhaust channel 3. A pressure reducing valve 41 is installed on the secondary exhaust pipe 4 to control the opening and closing of the secondary exhaust pipe 4. When the secondary exhaust pipe 4 is open, it is equivalent to increasing the diameter of the exhaust channel 3, increasing the exhaust flow rate. When the secondary exhaust pipe 4 is closed, the diameter of the exhaust channel 3 returns to its original size, and the exhaust flow rate returns to normal. A gas cooling device 22 is installed on the intake channel 2. The gas cooling device 22 can cool the intake gas, reduce the intake temperature, and reduce the gas density to increase the intake air flow rate.

[0029] The control unit is typically a host computer, such as a PC or server. It can also be a control element within the air compressor, which is not limited here. The control unit is connected to various sensors and control elements, specifically the flow meter 21, the current acquisition device 12, the pressure reducing valve 41, and the electric valve 31. The control unit collects current signals from the flow meter 21 and the current acquisition device 12. It should be noted that the air compressor contains a signal conversion unit and a communication unit. The signal conversion unit converts the signal collected by the flow meter 21 into a current signal and transmits it to the control unit via the communication unit. The current acquisition device 12 directly collects the current signal and transmits it to the control unit via the communication unit, enabling the control unit to collect the current signals from the flow meter 21 and the current acquisition device 12 in real time. The signal conversion unit is well-known to those skilled in the art and will not be described in detail here. The communication unit can be wireless or wired communication, such as Bluetooth, Wi-Fi, or a 5G module. The control unit outputs control signals to control the opening and closing of the pressure reducing valve 41 and the opening degree of the electric valve 31. The control unit monitors the air compressor for surge by collecting current signals in real time. If surge is detected, it controls the pressure reducing valve 41 to open, thereby opening the auxiliary exhaust pipe 4, increasing the diameter of the exhaust passage 3, reducing the exhaust pressure, and allowing the air compressor to quickly recover from surge. If surge is detected, it can also control the electric valve 31 to increase the valve opening, reducing the exhaust pressure and increasing the intake flow, thus allowing the air compressor to quickly recover from surge. Furthermore, if surge is detected, it can also control the gas cooling device 22 to open, reducing the intake temperature and density to increase the intake flow, thus allowing the air compressor to quickly recover from surge. It is understandable that simultaneously controlling the pressure reducing valve 41, opening the gas cooling device 22, and increasing the opening of the electric valve 31 works together to ensure the air compressor quickly recovers from surge, improving the reliability of surge recovery and protecting the normal operation of the air compressor.

[0030] Continue to refer to Figure 1 In one embodiment, the air compression unit further includes a controller 13 and a voltage regulator 14. The controller 13 is connected to the driver 11, and the voltage regulator 14 is connected to the controller 13. The controller 13 can adjust the air compressor parameters by controlling the driver 11, and the voltage regulator 14 can stabilize the output voltage, thereby playing a role in current stabilization. The controller 13 can be, for example, a control circuit or a control chip, and the voltage regulator 14 can be a voltage regulator circuit, such as a Zener diode or a voltage regulator chip. The voltage regulator 14 stabilizes the current of the driver 11, avoiding noise in the current signal of the driver 11 and improving the stability of the current signal.

[0031] Continue to refer to Figure 1In one embodiment, the air compressor further includes an air filter 23, which is disposed on the intake side of the intake channel 2. Specifically, since the air filter 23 is disposed on the intake side of the intake channel 2, all gas entering the intake channel 2 needs to be filtered by the air filter 23 first to remove dust and impurities from the air, preventing dust and impurities in the gas from entering the air compressor and damaging the components, thus ensuring the reliable operation of the air compressor.

[0032] In this embodiment, the air compressor further includes a gas buffer device 24, which is disposed on the air intake channel 2. The gas buffer device 24 serves to stabilize the airflow, preventing excessive fluctuations in the intake air pressure and ensuring the stability of the intake air.

[0033] The operation of the air compressor will be explained below by comparing it to two states: normal operation and surge.

[0034] When the air compressor is in normal operation, the gas is filtered through air filter 23 and enters the intake passage 2. It is then compressed by the air compressor body 1 and finally discharged from the exhaust passage 3. Throughout normal operation, the electric valve 31 is always open, and the gas cooling device 22 is not activated. The control unit collects the current signals from the current collection device and flow meter 21 in real time, obtaining their variation curves.

[0035] During operation, the air compressor adjusts the opening of the electric valve 31. The intake air flow decreases as the valve opening decreases, while the exhaust pressure increases. This reduces the air compressor load and the current. When the valve opening is too small, the exhaust pressure suddenly increases, while the intake air flow decreases rapidly, and the current decreases rapidly with greater fluctuations.

[0036] When surge is detected in the air compressor, the operating conditions of the air compressor at that moment are recorded. Simultaneously, the control unit activates the gas cooling device 22 to reduce the intake air temperature and density, thereby increasing the intake flow rate. It also controls the pressure reducing valve 41 to open, increasing the diameter of the exhaust passage 3 and reducing the exhaust pressure. Finally, it controls the electric valve 31 to increase the valve opening, reducing the discharge pressure and increasing the intake flow rate. After the gas cooling device 22, pressure reducing valve 41, and electric valve 31 work together, it is determined again whether the air compressor is still in a surge state. If the air compressor is still in a surge state, the gas cooling device 22, pressure reducing valve 41, and electric valve 31 will work together again until the air compressor recovers from the surge state.

[0037] By implementing the embodiments of the present invention, the air compressor anti-surge function can be realized through the monitoring, processing, identification and control of the control unit. It can quickly and automatically judge the surge of the air compressor and respond in a timely manner, so that the air compressor can quickly get out of the surge operation state, protect the various components of the air compressor and ensure that the air compressor can operate reliably for a long time, and extend the service life of the air compressor.

[0038] Reference Figure 2 This invention also provides a control method for an air compressor, wherein the air compressor is the one described in the above embodiments, which has been described in detail in the above embodiments, and will not be repeated here for the sake of brevity. The flowchart of the control method is shown below. Figure 2 As shown, it includes steps S110-S130.

[0039] S110. Obtain the current signal change curves of the flow meter and current acquisition device;

[0040] In this embodiment, the control unit is a host computer. The host computer collects the current signals from the flow meter and the current acquisition device in real time, and processes the multiple current signals according to the time domain changes to obtain the current signal change curves. After processing, the current change curves corresponding to the changes in the intake flow rate collected by the flow meter and the current signal change curves corresponding to the changes in the driver current collected by the current acquisition device are obtained respectively.

[0041] S120. Perform time-domain analysis on the current signal change curve to determine whether the air compressor has entered a surge state.

[0042] In this embodiment, time-domain analysis refers to analyzing the stability, transient, and steady-state performance of the control system under certain inputs based on the time-domain expression of the output. Since time-domain analysis directly analyzes the system in the time domain, it has the advantages of being intuitive and accurate. The time-domain representation of the system output can be obtained from differential equations or transfer functions. Specifically, this embodiment comprehensively judges the current signal change curves of the flowmeter and the current signal change curves of the current acquisition device. When the set identification conditions are met, the air compressor is identified as being in a surge state. By performing time-domain analysis on the current signal change curves, the operating state of the air compressor can be determined in real time, the surge state can be identified in a timely manner, and control actions can be executed promptly to allow the air compressor to quickly escape the surge and ensure the normal operation of the air compressor.

[0043] In one embodiment, such as Figure 3 As shown, step S120 further includes steps S121-S123.

[0044] S121. Determine whether there are abnormal fluctuations in the current signal change curve of the current acquisition device;

[0045] S122. If the current signal change curve of the current acquisition device shows abnormal fluctuations, then determine whether there are abnormal fluctuations in the current signal change curve of the flow meter.

[0046] S123. If abnormal fluctuations occur in the current signal change curve of the flow meter, it is determined that the air compressor has entered a surge state.

[0047] In this embodiment, abnormal fluctuations in the current signal curve are used to determine whether the air compressor has entered a surge state. Abnormal fluctuations are characterized by spikes in the curve; the presence of spikes indicates abnormal fluctuations. Using only one parameter for identification can easily lead to misjudgments. Therefore, this embodiment uses different parameters to avoid misjudgments caused by overly simplistic criteria, thereby improving the accuracy of surge identification. Specifically, first, the current signal curve of the driver is checked for abnormal fluctuations; if abnormal fluctuations are found, the current signal curve of the intake airflow is then checked for abnormal fluctuations; if abnormal fluctuations are found, it indicates that the air compressor is in a surge state. Thus, a comprehensive evaluation using two different parameters ensures the accuracy of surge identification, avoids misjudgments leading to miscontrol, and prevents impact on work efficiency. Furthermore, one of the parameters used for evaluation is the driver's current signal, which is free from external environmental interference and has high accuracy, thereby improving the accuracy of surge identification.

[0048] In one embodiment, such as Figure 4 As shown, step S121 further includes steps S1211-S1215.

[0049] S1211. Obtain the first maximum value, the first minimum value, and the first average value from the current signal change curve of the current acquisition device;

[0050] S1212. Determine the first drive current fluctuation value based on the difference between the first maximum value and the first minimum value;

[0051] S1213. Determine the second drive current fluctuation value based on the difference between the first average value and the first minimum value;

[0052] S1214. Determine whether the first drive current fluctuation value is greater than the product of the second drive current fluctuation value and the budget coefficient;

[0053] S1215. If the first drive current fluctuation value is greater than the product of the second drive current fluctuation value and the budget coefficient, then it is determined that there is an abnormal fluctuation in the current signal change curve of the current acquisition device.

[0054] In this embodiment, it is first determined whether there is a spike in the current signal change curve corresponding to the driver. Specifically, the first maximum value x is extracted from the current signal change curve corresponding to the driver. max First minimum value x min and the first average Then calculate the difference between the first maximum value and the first minimum value, which is x. max -x min The first drive current fluctuation value is determined, which is the maximum fluctuation value in the change curve; then the difference between the first average value and the first minimum value is calculated, i.e. The second drive current fluctuation value is determined, and the first drive current fluctuation value is the average fluctuation value in the change curve. It is understood that this average fluctuation value can also be determined by calculating the difference between the first average value and the first maximum value. Finally, the magnitudes of the first drive current fluctuation value and the product of the second drive current fluctuation value and the budget coefficient are compared. The preset coefficient is 5, but it can also be other numbers. If so, it indicates that there is a spike in the current signal change curve corresponding to the driver, and the current of the driver has fluctuated abnormally.

[0055] In one embodiment, such as Figure 5 As shown, step S122 further includes steps S1221-S1225.

[0056] S1221. Obtain the second maximum value, the second minimum value, and the second average value from the voltage signal change curve of the flow meter;

[0057] S1222. Determine the first intake flow fluctuation value based on the difference between the second maximum value and the second minimum value;

[0058] S1223. Determine the second intake flow fluctuation value based on the difference between the second average value and the second minimum value;

[0059] S1224. Determine whether the first intake flow fluctuation value is greater than the product of the second intake flow fluctuation value and the budget coefficient;

[0060] S1225. If the first intake flow fluctuation value is greater than the product of the second intake flow fluctuation value and the budget coefficient, then it is determined that there is an abnormal fluctuation in the current signal change curve of the flow meter.

[0061] In this embodiment, after identifying abnormal fluctuations in the driver current, further analysis is performed to determine whether abnormal fluctuations in the intake airflow are occurring in order to further identify surge conditions. Specifically, the second maximum value y is first extracted from the current signal change curve corresponding to the intake airflow. maxThe second minimum value y min Second average Then calculate the difference between the second maximum value and the second minimum value, i.e., y. max -y min The first intake flow rate fluctuation value is determined, which is the maximum fluctuation value in the change curve; then the difference between the second average value and the second minimum value is calculated, i.e. The second intake flow rate fluctuation value is determined. This second intake flow rate fluctuation value is the average fluctuation value in the change curve. It is understood that this average fluctuation value can also be determined by calculating the difference between the second average value and the second maximum value. Finally, the product of the first intake flow rate fluctuation value and the second intake flow rate fluctuation value with a budget coefficient is compared. The preset coefficient is 3, but it can also be other numbers. If so, it indicates that a spike appears in the current signal change curve corresponding to the intake air flow, indicating abnormal fluctuations in the intake air flow. This shows that both the intake air flow and the driver current parameters are fluctuating abnormally, thus ensuring that the air compressor is indeed in a surge state, thereby improving the accuracy of the identification.

[0062] S130. If the air compressor enters a surge state, at least one of the following control actions is executed: turning on the gas cooling device, opening the pressure reducing valve, or increasing the opening of the electric valve.

[0063] In this embodiment, when the host computer detects that the air compressor is in a surge state, the air compressor experiences strong vibrations, which can easily damage the internal components. Therefore, this embodiment sends control signals from the host computer to the pressure reducing valve, the electric valve, and the gas cooling device. The pressure reducing valve opens, allowing the auxiliary exhaust pipe to be open, thereby increasing the diameter of the exhaust passage and reducing the exhaust pressure. The electric valve also increases its opening, further reducing the exhaust pressure and increasing the intake air volume. The gas cooling device is activated to cool the intake gas, lowering its temperature and density, thus increasing the intake air flow. These three actions work together to ensure the air compressor quickly recovers from the surge state, preventing damage to the internal components.

[0064] In other embodiments, on the one hand, since the opening degree of the electric valve affects the compression efficiency of the air compressor, when the opening degree of the electric valve decreases, the intake air flow will decrease as the valve opening degree decreases, and the exhaust pressure will increase as the valve opening degree decreases, thereby reducing the air compressor load and current, and affecting the compression efficiency of the air compressor; on the other hand, the opening degree of the electric valve is also closely related to the surge of the air compressor. Therefore, in order to ensure that the opening degree of the electric valve can be kept within a certain range, so that the air compressor can operate efficiently and normally. In this embodiment, when the air compressor experiences surge, the intake air flow rate and the current signals I1 and I2 of the actuator, as well as the opening degree K of the electric valve, are acquired. I1, I2, and K are used as critical values. Based on these critical values, adjustments are made according to a preset adjustment amount, where the preset adjustment amount is a constant satisfying the following formula: P = P' * (1 + q), where P' represents the reference parameters to be adjusted, i.e., I1, I2, and K; P represents the adjusted parameters; and q is the adjustment margin, determined by the diameter of the intake passage and the auxiliary exhaust pipe. Specifically, the diameters of the intake passage and the auxiliary exhaust pipe are normalized based on the intake passage, resulting in a normalized intake passage diameter of 1 and an auxiliary exhaust pipe diameter of q. The acquired current signals and the opening degree of the electric valve are then adjusted according to the preset adjustment amount. Air compressor surge is identified based on the adjusted current signals. After identification, the opening degree of the electric valve is controlled using the adjusted opening degree. This ensures that the air compressor can detect surge in advance and execute control actions accordingly, enabling it to operate efficiently and without the risk of surge, thus guaranteeing both compression efficiency and operational safety.

[0065] Figure 6 This is a schematic block diagram of a control device 200 for an air compressor provided in an embodiment of the present invention. Figure 6 As shown, corresponding to the above-described air compressor control method, the present invention also provides an air compressor control device 200. This air compressor control device 200 includes a unit for executing the above-described air compressor control method, and the device can be configured within the air compressor. Specifically, please refer to... Figure 6 The control device 200 of the air compressor includes an acquisition unit 201, a judgment unit 202, and a control unit 203.

[0066] The acquisition unit 201 is used to acquire the current signal change curves of the flow meter and the current acquisition device; the judgment unit 202 is used to perform time-domain analysis on the current signal change curves to determine whether the air compressor has entered a surge state; the control unit 203 is used to control the gas cooling device to open, the pressure reducing valve to conduct, and the opening degree of the electric valve to increase if the air compressor enters a surge state.

[0067] In some embodiments, such as this embodiment, the judgment unit 202 includes a first judgment subunit, a second judgment subunit, and a determination unit.

[0068] The first judgment subunit is used to judge whether there is abnormal fluctuation in the current signal change curve of the current acquisition device; the second judgment subunit is used to judge whether there is abnormal fluctuation in the current signal change curve of the flow meter if there is abnormal fluctuation in the current signal change curve of the current acquisition device; and the determination unit is used to determine that the air compressor has entered a surge state if there is abnormal fluctuation in the current signal change curve of the flow meter.

[0069] In some embodiments, such as this embodiment, the first determination subunit includes a first extraction unit, a first current fluctuation unit, a second current fluctuation unit, a first fluctuation determination unit, and a first determination subunit.

[0070] The system includes: a first extraction unit for acquiring a first maximum value, a first minimum value, and a first average value from the current signal change curve of the current acquisition device; a first current fluctuation unit for determining a first drive current fluctuation value based on the difference between the first maximum value and the first minimum value; a second current fluctuation unit for determining a second drive current fluctuation value based on the difference between the first average value and the first minimum value; a first fluctuation judgment unit for determining whether the first drive current fluctuation value is greater than the product of the second drive current fluctuation value and the budget coefficient; and a first determination subunit for determining that an abnormal fluctuation has occurred in the current signal change curve of the current acquisition device if the first drive current fluctuation value is greater than the product of the second drive current fluctuation value and the budget coefficient.

[0071] In some embodiments, such as this embodiment, the second determination subunit includes a second extraction unit, a first intake fluctuation unit, a second intake fluctuation unit, a second fluctuation determination unit, and a second determination subunit.

[0072] The system includes: a second extraction unit for acquiring the second maximum value, the second minimum value, and the second average value of the voltage signal change curve of the flow meter; a first intake fluctuation unit for determining a first intake flow fluctuation value based on the difference between the second maximum value and the second minimum value; a second intake fluctuation unit for determining a second intake flow fluctuation value based on the difference between the second average value and the second minimum value; a second fluctuation judgment unit for determining whether the first intake flow fluctuation value is greater than the product of the second intake flow fluctuation value and the budget coefficient; and a second determination subunit for determining that an abnormal fluctuation has occurred in the current signal change curve of the flow meter if the first intake flow fluctuation value is greater than the product of the second intake flow fluctuation value and the budget coefficient.

[0073] The control device for the aforementioned air compressor can be implemented as a computer program, which can, for example... Figure 7 The air compressor shown is running.

[0074] Please see Figure 7 , Figure 7 This is a schematic block diagram of an air compressor provided in an embodiment of the present invention. The air compressor 300 includes an air compression unit, an air intake passage, an exhaust passage, a secondary exhaust pipe, and a control unit.

[0075] See Figure 7 The air compressor 300 includes a processor 302, a memory, and a network interface 305 connected via a system bus 301. The memory may include a non-volatile storage medium 303 and internal memory 304.

[0076] The non-volatile storage medium 303 may store an operating system 3031 and a computer program 3032. When the computer program 3032 is executed, it causes the processor 302 to execute a control method for an air compressor.

[0077] The processor 302 provides computing and control capabilities to support the operation of the entire air compressor 300.

[0078] The internal memory 304 provides an environment for the operation of the computer program 3032 in the non-volatile storage medium 303. When the computer program 3032 is executed by the processor 302, the processor 302 can execute a control method for an air compressor.

[0079] This network interface 305 is used for network communication with other devices. Those skilled in the art will understand that... Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the air compressor 300 to which the present invention is applied. The specific air compressor 300 may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0080] The processor 302 is used to run a computer program 3032 stored in a memory to implement any embodiment of the control method for the air compressor described above.

[0081] It should be understood that, in this embodiment of the invention, the processor 302 may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0082] It will be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program may be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the process steps of the embodiments of the above methods.

[0083] Therefore, the present invention also provides a storage medium. This storage medium can be a computer-readable storage medium. The storage medium stores a computer program. When executed by a processor, the computer program causes the processor to perform any embodiment of the control method for the air compressor described above.

[0084] The storage medium can be any computer-readable storage medium capable of storing program code, such as a USB flash drive, portable hard drive, read-only memory (ROM), magnetic disk, or optical disk.

[0085] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0086] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is merely a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0087] The steps in the method of this invention can be adjusted, merged, or reduced in order according to actual needs. The units in the device of this invention can be merged, divided, or reduced according to actual needs. Furthermore, the functional units in the various embodiments of this invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0088] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an air compressor to execute all or part of the steps of the methods described in the various embodiments of the present invention.

[0089] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0090] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims and their equivalents, this invention also intends to include these modifications and variations.

[0091] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air compressor, characterized in that, include: An air compression unit includes an air compressor body, a driver, and a current acquisition device, wherein the driver is connected to the air compressor body and the current acquisition device is connected to the driver. An air intake channel is connected to the air intake port of the air compressor body. The air intake channel is equipped with a flow meter for collecting the air intake flow rate and a gas cooling device. An exhaust passage is connected to the exhaust port of the air compressor body, and an electric valve for controlling the exhaust pressure and intake air volume is provided on the exhaust passage; A secondary exhaust pipe is provided on the exhaust side of the exhaust passage, and a pressure reducing valve is provided on the secondary exhaust pipe for controlling the opening and closing of the secondary exhaust pipe; The control unit is connected to the flow meter, the current acquisition device, the gas cooling device, the pressure reducing valve, and the electric valve; The control unit is used to collect current signals from the flow meter and the current acquisition device to monitor whether the air compressor has entered a surge state. When the current signal change curve of the current acquisition device and the current signal change curve of the flow meter both show abnormal fluctuations, the air compressor has entered a surge state. At least two control actions are executed, including turning on the gas cooling device, opening the pressure reducing valve, and increasing the opening of the electric valve.

2. The air compressor according to claim 1, characterized in that, The air compression unit also includes a controller and a voltage regulator, the controller being connected to the driver and the voltage regulator being connected to the controller.

3. The air compressor according to claim 1 or 2, characterized in that, The air compressor further includes an air filter located on the intake side of the intake passage; and / or the air compressor further includes a gas buffer device located on the intake passage.

4. A control method for an air compressor, characterized in that, The control method, applied to the air compressor as described in any one of claims 1-3, comprises: Acquire the current signal variation curves of the flow meter and current acquisition device; To determine whether the air compressor has entered a surge state, it is necessary to judge whether the current signal change curve of the current acquisition device and the current signal change curve of the flow meter both show abnormal fluctuations. If the air compressor enters a surge state, at least two of the following control actions are executed: turning on the gas cooling device, opening the pressure reducing valve, and increasing the opening of the electric valve.

5. The control method according to claim 4, characterized in that, The step of determining whether abnormal fluctuations occur in the current signal change curve of the current acquisition device includes: Obtain the first maximum value, the first minimum value, and the first average value from the current signal change curve of the current acquisition device; The first drive current fluctuation value is determined based on the difference between the first maximum value and the first minimum value; The second drive current fluctuation value is determined based on the difference between the first average value and the first minimum value; Determine whether the first drive current fluctuation value is greater than the product of the second drive current fluctuation value and the budget coefficient; if the first drive current fluctuation value is greater than the product of the second drive current fluctuation value and the budget coefficient, then determine that there is an abnormal fluctuation in the current signal change curve of the current acquisition device.

6. The control method according to claim 4, characterized in that, The step of determining whether abnormal fluctuations occur in the current signal change curve of the current acquisition device includes: Obtain the second maximum value, the second minimum value, and the second average value from the current signal change curve of the flow meter; The first intake flow fluctuation value is determined based on the difference between the second maximum value and the second minimum value; The second intake flow fluctuation value is determined based on the difference between the second average value and the second minimum value; Determine whether the first intake flow fluctuation value is greater than the product of the second intake flow fluctuation value and the budget coefficient; If the first intake flow fluctuation value is greater than the product of the second intake flow fluctuation value and the budget coefficient, then it is determined that there is an abnormal fluctuation in the current signal change curve of the flow meter.

7. A control device for an air compressor, characterized in that, include: The acquisition unit is used to acquire the current signal change curves of the flow meter and the current acquisition device; The judgment unit is used to determine whether the current signal change curve of the current acquisition device and the current signal change curve of the flow meter both show abnormal fluctuations in order to determine whether the air compressor has entered a surge state. The control unit is used to control the gas cooling device to turn on, the pressure reducing valve to open, and the opening degree of the electric valve to increase if the air compressor enters a surge state.

8. A computer device, characterized in that, The computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 4-6.

9. A computer-readable storage medium, characterized in that, The storage medium stores a computer program that, when executed by a processor, can implement the method as described in any one of claims 4-6.

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