Air compressor, control method and device thereof and computer readable storage medium

Abstract

The invention relates to the technical field of air compressors, and discloses an air compressor, a control method and device of the air compressor and a computer readable storage medium, the air compressor comprises a guide vane, and the control method of the air compressor comprises the steps that the air using end pressure requirement of the air compressor is obtained, and target starting pressure is determined according to the air using end pressure requirement; the dynamic starting guide vane opening degree is obtained according to the target starting pressure; and when the air compressor is started, the guide vane is controlled to be opened to the dynamic starting guide vane opening degree. Therefore, the optimal guide vane opening degree can be dynamically calculated and set when the air compressor is started, and the starting safety and stability are improved.

Description

Technical Field

[0001] This invention relates to the field of air compressor technology, and more particularly to an air compressor and its control method and apparatus, as well as a computer-readable storage medium. Background Technology

[0002] Centrifugal air compressors, as a type of velocity air compressor, have been widely used in industrial production due to their compact structure, high efficiency, reliability, and large air delivery capacity. However, during the startup process, the rationality of the initial guide vane opening setting directly affects the stability and reliability of the entire system.

[0003] Currently, in the control of geared centrifugal air compressors, traditional start-up methods typically set a fixed initial guide vane opening based solely on a preset target pressure. This method has significant limitations because it completely ignores the real-time fluctuations in the actual pressure at the user end. When there is no pressure demand at the user end, if the guide vane opening is set too large, a large amount of air will rush into the compressor impeller instantly, causing a sharp increase in motor load, which can easily trigger overcurrent protection and even cause the equipment to trip; this risk of sudden torque increase is particularly prominent when using a star-delta start-up method. Conversely, when the pressure at the user end changes abruptly due to the start-up or shutdown of other parallel units, an insufficient guide vane opening will result in insufficient air intake, causing airflow separation within the impeller, ultimately leading to compressor surge, manifested as periodic pressure fluctuations and abnormal noises. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a control method for an air compressor that can dynamically calculate and set the optimal guide vane opening during compressor startup, thereby improving startup safety and stability.

[0005] A second objective of this invention is to provide a computer-readable storage medium.

[0006] The third objective of this invention is to provide a control device for an air compressor.

[0007] The fourth objective of this invention is to provide an air compressor.

[0008] To achieve the above objectives, a first aspect of the present invention provides a control method for an air compressor, wherein the air compressor includes guide vanes, and the method includes: acquiring the air demand end pressure requirement of the air compressor, and determining a target start-up pressure based on the air demand end pressure requirement; obtaining a dynamic start-up guide vane opening degree based on the target start-up pressure; and controlling the guide vanes to open to the dynamic start-up guide vane opening degree when the air compressor starts.

[0009] According to the air compressor control method of the present invention, by acquiring the air demand end pressure requirement of the air compressor, determining the target start pressure based on the air demand end pressure requirement, and obtaining the dynamic start guide vane opening based on the target start pressure, and controlling the guide vane to open to the dynamic start guide vane opening when the air compressor starts, the optimal guide vane opening when the air compressor starts can be dynamically calculated and set, thereby improving start-up safety and stability.

[0010] In addition, the air compressor control method according to the above embodiments of the present invention may further include the following additional technical features: According to one embodiment of the present invention, determining the target start-up pressure based on the gas end pressure demand includes: taking the larger value between the pressure value corresponding to the gas end pressure demand and a preset target pressure as the target start-up pressure; wherein, the method further includes: if the gas end pressure demand is not obtained, then taking the preset target pressure as the target start-up pressure.

[0011] According to one embodiment of the present invention, obtaining the dynamic start-up guide vane opening based on the target start-up pressure includes: calculating the start-up pressure ratio based on the target start-up pressure and the atmospheric pressure at the location of the air compressor; obtaining the total energy head of the air compressor based on the start-up pressure ratio; and obtaining the dynamic start-up guide vane opening based on the total energy head.

[0012] According to one embodiment of the present invention, the air compressor is a multi-stage compression air compressor; the step of obtaining the total energy head of the air compressor based on the starting pressure ratio includes: determining the sub-starting pressure ratio of each stage of the air compressor based on the starting pressure ratio; for each stage, obtaining the energy head of that stage based on the sub-starting pressure ratio of that stage and the instantaneous value of the intake temperature of that stage; and obtaining the total energy head of the air compressor based on all the energy heads.

[0013] According to one embodiment of the present invention, obtaining the dynamic start-up guide vane opening based on the total energy head includes: calculating the start-up predicted critical guide vane opening based on the total energy head; and calculating the dynamic start-up guide vane opening based on the start-up predicted critical guide vane opening.

[0014] According to one embodiment of the present invention, the starting pressure ratio is calculated by the following formula:

[0015] in, This indicates the starting pressure ratio. This indicates the target startup pressure. This indicates the atmospheric pressure.

[0016] According to one embodiment of the present invention, the energy head is calculated using the following formula:

[0017] in, The integer is greater than 0 and less than N, where N is the total number of stages of the air compressor. The adiabatic index, The gas constant is Indicates the first The instantaneous value of the inhalation temperature at level 1. Indicates the first The sub-start pressure ratio of the stage.

[0018] According to one embodiment of the present invention, the start-up prediction critical guide vane opening is calculated by the following formula:

[0019] in, This indicates the critical guide vane opening. This represents the natural exponential function. This refers to the total energy head. , , , , , , It is a constant.

[0020] To achieve the above objectives, a second aspect of the present invention provides a computer-readable storage medium storing an air compressor control program thereon, wherein the air compressor control program, when executed by a processor, implements the air compressor control method of the aforementioned embodiments of the present invention.

[0021] According to the computer-readable storage medium of the present invention, by executing the control program of the air compressor through a processor, the optimal guide vane opening at the start of the air compressor can be dynamically calculated and set, thereby improving the safety and stability of start-up.

[0022] To achieve the above objectives, a third aspect of the present invention provides a control device for an air compressor, wherein the air compressor includes guide vanes, and the device includes: an acquisition module for acquiring the air demand end pressure requirement of the air compressor and determining a target start-up pressure based on the air demand end pressure requirement; a processing module for obtaining a dynamic start-up guide vane opening degree based on the target start-up pressure; and a control module for controlling the guide vanes to open to the dynamic start-up guide vane opening degree when the air compressor starts.

[0023] According to the air compressor control device of the present invention, the air compressor obtains the air demand end pressure requirement of the air compressor through the acquisition module, determines the target start pressure according to the air demand end pressure requirement, obtains the dynamic start guide vane opening degree according to the target start pressure through the processing module, and controls the guide vane to open to the dynamic start guide vane opening degree when the air compressor starts through the control module. In this way, the optimal guide vane opening degree when the air compressor starts can be dynamically calculated and set, thereby improving the start-up safety and stability.

[0024] To achieve the above objectives, a fourth aspect of the present invention provides an air compressor, wherein the control device of the air compressor described in the aforementioned embodiments of the present invention is included.

[0025] According to an embodiment of the present invention, by employing the control device of the air compressor of the above embodiment of the present invention, the optimal guide vane opening at the start of the air compressor can be dynamically calculated and set, thereby improving the start-up safety and stability.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating a control method for an air compressor according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating a control method for an air compressor according to another embodiment of the present invention; Figure 3 This is a flowchart illustrating a control method for an air compressor according to yet another embodiment of the present invention; Figure 4 This is a flowchart illustrating a control method for an air compressor according to another embodiment of the present invention; Figure 5 This is a block diagram of the control device for an air compressor according to an embodiment of the present invention; Figure 6 This is a block diagram of an air compressor according to an embodiment of the present invention. The air compressor includes a control device 100, an acquisition module 10, a processing module 20, a control module 30, and an air compressor 1000. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] The following description, with reference to the accompanying drawings, describes an air compressor control method, a computer-readable storage medium, an air compressor control device, and an air compressor according to embodiments of the present invention.

[0030] Figure 1 This is a flowchart illustrating a control method for an air compressor according to an embodiment of the present invention.

[0031] Specifically, in some embodiments of the present invention, the air compressor includes guide vanes, such as... Figure 1 As shown, the control method for the air compressor includes: S101, obtain the air consumption end pressure requirement of the air compressor, and determine the target start-up pressure based on the air consumption end pressure requirement.

[0032] Specifically, in this embodiment, the air-consuming end pressure requirement includes no external input, analog input, and communication input. When the air compressor's air-consuming end pressure requirement is no external input, that is, when the system detects no valid pressure signal input at the air-consuming end, the default target pressure setting value in the air compressor's main controller is used as the target start-up pressure.

[0033] The system acquires the air compressor's air-consuming pressure requirement as an analog input. When the system detects an analog signal (such as 4-20mA or 0-10V) from a pressure sensor, it reads the corresponding pressure value IP01. Subsequently, the pressure value IP01 is compared with the preset target pressure, and the maximum value between the two is taken as the final target starting pressure.

[0034] The system obtains the air compressor's air consumption pressure requirement as a communication input. That is, when the system receives a communication command from the upper control system via a fieldbus (such as Profibus, Modbus TCP), it parses the pressure value CP01 contained in the command. Similarly, it compares the pressure value CP01 with the preset target pressure and takes the maximum value as the final target starting pressure.

[0035] S102, the dynamic start-up guide vane opening is obtained based on the target start-up pressure.

[0036] Specifically, in this embodiment, the starting pressure ratio is calculated based on the target starting pressure and the atmospheric pressure at the location of the air compressor. The air compressor is a multi-stage compression air compressor. Then, the sub-starting pressure ratio of each stage of the air compressor is determined based on the starting pressure ratio. For each stage, the energy head of that stage is obtained based on the sub-starting pressure ratio and the instantaneous value of the intake temperature of that stage. The total energy head of the air compressor is obtained based on all energy heads. The start-up prediction critical guide vane opening is calculated based on the total energy head, and the dynamic start-up guide vane opening is calculated based on the start-up prediction critical guide vane opening.

[0037] S103 controls the guide vanes to open to the dynamic start-up guide vane opening degree when the air compressor starts.

[0038] Specifically, in this embodiment, when the air compressor receives the start command, the main controller does not immediately start the motor. Instead, it first sends a command to the guide vane actuator (usually an electric or pneumatic actuator) to drive the guide vane from its original opening to the dynamic start-up guide vane opening calculated in step S102. After the guide vane stabilizes at the dynamic start-up guide vane opening position, the main motor is then started. This avoids the motor starting torque and current surge caused by an excessively large fixed opening in traditional methods, and also eliminates the risk of insufficient air intake and surge during startup caused by an excessively small opening. It provides optimal initial conditions for the entire startup process, ensuring a safe, stable, and efficient start-up of the equipment.

[0039] Furthermore, in some embodiments of the present invention, determining the target start-up pressure based on the gas end pressure demand includes: taking the larger value between the pressure value corresponding to the gas end pressure demand and the preset target pressure as the target start-up pressure; wherein, the method further includes: if the gas end pressure demand is not obtained, then taking the preset target pressure as the target start-up pressure.

[0040] Specifically, in this embodiment, the air-end pressure requirement includes no external input, analog input, and communication input. When the air compressor's air-end pressure requirement is no external input, it is determined that no air-end pressure requirement has been obtained, and a preset target pressure is used as the target start-up pressure. When the air compressor's air-end pressure requirement is an analog input or a communication input, the pressure value corresponding to the analog input or the pressure value corresponding to the communication input is compared with the preset target pressure, and the larger value is taken as the target start-up pressure.

[0041] Furthermore, in some embodiments of the present invention, such as Figure 2 As shown, the dynamic start-up guide vane opening is obtained based on the target start-up pressure, including: S201, calculate the starting pressure ratio based on the target starting pressure and the atmospheric pressure at the location of the air compressor.

[0042] Specifically, in this embodiment, the starting pressure ratio is a key thermodynamic parameter that represents the total pressure increase that the compressor needs to achieve, and its calculation formula is as follows:

[0043] in, Indicates the starting pressure ratio. Indicates the target initiation pressure. It represents atmospheric pressure.

[0044] This formula combines the target start-up pressure with the local atmospheric pressure, thereby eliminating the impact of atmospheric pressure fluctuations caused by altitude and weather changes on control accuracy. This allows subsequent calculations to adapt to any geographical and environmental conditions, laying the foundation for establishing a universal and accurate control model.

[0045] S202, the total energy head of the air compressor is obtained based on the starting pressure ratio, and the dynamic start-up guide vane opening is obtained based on the total energy head.

[0046] Specifically, in this embodiment, the system first calculates the total energy head required to drive the compressor using thermodynamic formulas, based on the starting pressure ratio and real-time monitoring of the intake temperatures at each stage. Then, the system uses this total energy head as input and maps it to the corresponding dynamic start-up guide vane opening through a pre-established mathematical model or empirical formula validated by extensive experimental data.

[0047] Furthermore, in some embodiments of the present invention, such as Figure 3 As shown, the air compressor is a multi-stage compression type; the total energy head of the air compressor is obtained based on the starting pressure ratio, including: S301 determines the sub-starting pressure ratio of each stage of the air compressor based on the starting pressure ratio.

[0048] Specifically, in this embodiment, for a multi-stage compression air compressor, the total pressure ratio needs to be rationally allocated to each compression stage to avoid one stage being overloaded while another is underloaded. For example, in the case of a three-stage compression air compressor, a set of allocation coefficients can be introduced, and the sub-start pressure ratio of each stage can be calculated using the following formula:

[0049]

[0050]

[0051] in, This indicates the sub-start pressure ratio of the first stage. This indicates the sub-start pressure ratio of the second stage. This indicates the sub-start pressure ratio of the third stage. This represents the allocation coefficient for the first level. This represents the allocation coefficient for the second level. This represents the distribution coefficient for the third stage. It should be noted that the distribution coefficient is a fixed value that is pre-optimized and determined based on factors such as the compressor's aerodynamic design, impeller characteristics, and interstage cooling efficiency, ensuring balanced load across all stages.

[0052] S302, for each stage, the energy head of that stage is obtained based on the sub-start pressure ratio of that stage and the instantaneous value of the inhalation temperature of that stage.

[0053] Specifically, in this embodiment, when it is a three-stage compression air compressor, the energy head of each stage can be calculated according to the following formula:

[0054]

[0055]

[0056] in, The first-level energy head, For the second level of energy head, It is a level three energy head. The adiabatic index, The gas constant is This represents the instantaneous value of the inhalation temperature in the first stage. This indicates the instantaneous value of the inhalation temperature in the second stage. This represents the instantaneous inhalation temperature value for the third stage. This indicates the sub-start pressure ratio of the first stage. This indicates the sub-start pressure ratio of the second stage. This indicates the sub-start pressure ratio of the third stage.

[0057] S303, the total energy head of the air compressor is obtained based on all energy heads.

[0058] Specifically, in this embodiment, the total energy head of the compressor is the arithmetic sum of the energy heads of each stage, and the total energy head of the air compressor can be obtained according to the following formula:

[0059] in, The total energy head of the air compressor, The first-level energy head, For the second level of energy head, It is a level three energy head.

[0060] Furthermore, in some embodiments of the present invention, such as Figure 4 As shown, the dynamic start-up guide vane opening is obtained based on the total energy head, including: S401, calculates the critical guide vane opening for startup based on the total energy head.

[0061] Specifically, in this embodiment, the critical guide vane opening for startup prediction can be calculated using the following formula:

[0062] in, This indicates the critical guide vane opening. This represents the natural exponential function. Indicates the total energy head. , , , , , , It is a constant.

[0063] S402, calculate the dynamic start-up guide vane opening based on the predicted critical guide vane opening.

[0064] Specifically, in this embodiment, the dynamic start-up guide vane opening can be calculated using the following formula:

[0065] in, This indicates the dynamic start-up guide vane opening. This represents the margin coefficient for the critical guide vane opening, used to proportionally amplify the critical opening. This indicates the critical guide vane opening. This indicates the margin for dynamic start-up of the guide vanes, used to ensure that surge does not occur.

[0066] Furthermore, in some embodiments of the present invention, the starting pressure ratio is calculated using the following formula:

[0067] in, Indicates the starting pressure ratio. Indicates the target initiation pressure. It represents atmospheric pressure.

[0068] Furthermore, in some embodiments of the present invention, the energy head is calculated using the following formula:

[0069] in, The integer is greater than 0 and less than N, where N is the total number of stages in the air compressor. The adiabatic index, The gas constant is Indicates the first The instantaneous value of the inhalation temperature at level 1. Indicates the first The sub-start pressure ratio of the stage.

[0070] Furthermore, in some embodiments of the present invention, the critical guide vane opening for startup prediction is calculated using the following formula:

[0071] in, This indicates the critical guide vane opening. This represents the natural exponential function. Indicates the total energy head. , , , , , , It is a constant.

[0072] In summary, the air compressor control method according to the embodiments of the present invention obtains the air compressor's air-consuming end pressure requirement, determines the target start-up pressure based on the air-consuming end pressure requirement, obtains the dynamic start-up guide vane opening based on the target start-up pressure, and controls the guide vane to open to the dynamic start-up guide vane opening when the air compressor starts. This allows for dynamic calculation and setting of the optimal guide vane opening when the air compressor starts, thereby improving start-up safety and stability.

[0073] Based on the air compressor control method proposed in the foregoing embodiments of the present invention, the present invention also proposes a computer-readable storage medium storing an air compressor control program thereon. When the air compressor control program is executed by a processor, it implements the air compressor control method of the above embodiments of the present invention.

[0074] According to the computer-readable storage medium of the present invention, by executing the control program of the air compressor through a processor, the optimal guide vane opening at the start of the air compressor can be dynamically calculated and set, thereby improving the safety and stability of start-up.

[0075] Figure 5 This is a block diagram of the control device for an air compressor according to an embodiment of the present invention.

[0076] Specifically, the air compressor includes guide vanes, as shown in Figure 5, and the air compressor control device 100 includes an acquisition module 10, a processing module 20, and a control module 30.

[0077] The acquisition module 10 is used to acquire the air demand end pressure requirement of the air compressor and determine the target start pressure based on the air demand end pressure requirement; the processing module 20 is used to obtain the dynamic start guide vane opening degree based on the target start pressure; and the control module 30 is used to control the guide vane to open to the dynamic start guide vane opening degree when the air compressor starts.

[0078] In some embodiments of the present invention, the acquisition module 10 is specifically used to take the larger value between the pressure value corresponding to the gas end pressure demand and the preset target pressure as the target start pressure; wherein, if the gas end pressure demand is not acquired, the preset target pressure is taken as the target start pressure.

[0079] In some embodiments of the present invention, the processing module 20 is specifically used to calculate the starting pressure ratio based on the target starting pressure and the atmospheric pressure at the location of the air compressor; obtain the total energy head of the air compressor based on the starting pressure ratio; and obtain the dynamic start-up guide vane opening based on the total energy head.

[0080] In some embodiments of the present invention, the air compressor is a multi-stage compression air compressor; the processing module 20 is further configured to determine the sub-starting pressure ratio of each stage of the air compressor according to the starting pressure ratio; for each stage, the energy head of that stage is obtained according to the sub-starting pressure ratio of that stage and the instantaneous value of the intake temperature of that stage; and the total energy head of the air compressor is obtained according to all the energy heads.

[0081] In some embodiments of the present invention, the processing module 20 is further configured to calculate the start-up predicted critical guide vane opening based on the total energy head; and to calculate the dynamic start-up guide vane opening based on the start-up predicted critical guide vane opening.

[0082] In some embodiments of the present invention, the starting pressure ratio is calculated using the following formula:

[0083] in, Indicates the starting pressure ratio. Indicates the target initiation pressure. It represents atmospheric pressure.

[0084] In some embodiments of the present invention, the energy head is calculated using the following formula:

[0085] in, The integer is greater than 0 and less than N, where N is the total number of stages in the air compressor. The adiabatic index, The gas constant is Indicates the first The instantaneous value of the inhalation temperature at level 1. Indicates the first The sub-start pressure ratio of the stage.

[0086] In some embodiments of the present invention, the critical guide vane opening for startup prediction is calculated using the following formula:

[0087] in, This indicates the critical guide vane opening. This represents the natural exponential function. Indicates the total energy head. , , , , , , It is a constant.

[0088] It should be noted that other specific embodiments of the air compressor control device proposed in the embodiments of the present invention can be found in the specific embodiments of the air compressor control method described above. To reduce redundancy, they will not be repeated here.

[0089] In summary, the air compressor control device according to the embodiments of the present invention acquires the air compressor's air-consuming end pressure requirement through the acquisition module, determines the target start-up pressure based on the air-consuming end pressure requirement, obtains the dynamic start-up guide vane opening degree based on the target start-up pressure through the processing module, and controls the guide vane to open to the dynamic start-up guide vane opening degree when the air compressor starts through the control module. In this way, the optimal guide vane opening degree when the air compressor starts can be dynamically calculated and set, thereby improving start-up safety and stability.

[0090] Figure 6 This is a block diagram of an air compressor according to an embodiment of the present invention.

[0091] like Figure 6 As shown, the air compressor 1000 includes the control device 100 of the air compressor described in the above embodiment of the present invention.

[0092] According to an embodiment of the present invention, by employing the control device of the air compressor of the above embodiment of the present invention, the optimal guide vane opening at the start of the air compressor can be dynamically calculated and set, thereby improving the start-up safety and stability.

[0093] Furthermore, the other components and functions of the air compressor in the embodiments of the present invention are known to those skilled in the art, and will not be described in detail here to reduce redundancy.

[0094] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0095] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0096] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0097] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0098] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0099] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0100] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0101] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for an air compressor, characterized in that, The air compressor includes guide vanes, and the method includes: Obtain the air consumption end pressure requirement of the air compressor, and determine the target start-up pressure based on the air consumption end pressure requirement; The dynamic start-up guide vane opening is obtained based on the target start-up pressure. When the air compressor starts, the guide vanes are controlled to open to the dynamic start-up guide vane opening degree.

2. The control method for an air compressor according to claim 1, characterized in that, Determining the target start-up pressure based on the gas demand includes: The larger of the pressure value corresponding to the gas demand end pressure and the preset target pressure is taken as the target start pressure; The method further includes: If the required gas pressure is not obtained, the preset target pressure will be used as the target start-up pressure.

3. The control method for an air compressor according to claim 1, characterized in that, The step of obtaining the dynamic start-up guide vane opening based on the target start-up pressure includes: The starting pressure ratio is calculated based on the target starting pressure and the atmospheric pressure at the location of the air compressor; The total energy head of the air compressor is obtained based on the starting pressure ratio, and the dynamic start-up guide vane opening is obtained based on the total energy head.

4. The control method for an air compressor according to claim 3, characterized in that, The air compressor is a multi-stage compression air compressor; The step of obtaining the total energy head of the air compressor based on the starting pressure ratio includes: The sub-starting pressure ratios of each stage of the air compressor are determined based on the starting pressure ratio. For each stage, the energy head of that stage is obtained based on the sub-start pressure ratio and the instantaneous inhalation temperature of that stage. The total energy head of the air compressor is obtained from all the energy heads described.

5. The control method for an air compressor according to claim 3, characterized in that, The step of obtaining the dynamic start-up guide vane opening based on the total energy head includes: Calculate the critical guide vane opening for startup prediction based on the total energy head; The dynamic start-up guide vane opening is calculated based on the predicted critical guide vane opening.

6. The control method for an air compressor according to claim 3, characterized in that, The starting pressure ratio is calculated using the following formula: in, This indicates the starting pressure ratio. This indicates the target startup pressure. This indicates the atmospheric pressure.

7. The control method for an air compressor according to claim 4, characterized in that, The energy head is calculated using the following formula: in, The integer is greater than 0 and less than N, where N is the total number of stages of the air compressor. The adiabatic index, The gas constant is... Indicates the first The instantaneous value of the inhalation temperature at level 1. Indicates the first The sub-start pressure ratio of the stage.

8. The control method for an air compressor according to claim 5, characterized in that, The critical guide vane opening for startup prediction is calculated using the following formula: in, This indicates the critical guide vane opening. This represents the natural exponential function. This refers to the total energy head. , , , , , , It is a constant.

9. A computer-readable storage medium, characterized in that, It stores an air compressor control program, which, when executed by a processor, implements the air compressor control method according to any one of claims 1-8.

10. A control device for an air compressor, characterized in that, The air compressor includes guide vanes, and the device includes: The acquisition module is used to acquire the air consumption end pressure requirement of the air compressor and determine the target start-up pressure based on the air consumption end pressure requirement; The processing module is used to obtain the dynamic start-up guide vane opening based on the target start-up pressure; The control module is used to control the guide vanes to open to the dynamic start-up guide vane opening degree when the air compressor starts.

11. An air compressor, characterized in that, The control device for the air compressor as described in claim 10.

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