A centrifugal compressor surge protection method, device, equipment and storage medium

Abstract

The present invention relates to a centrifugal compressor surge protection method, device, equipment and storage medium, and to the technical field of centrifugal compressors. The method comprises: acquiring the pressure of the air inlet and the rotation speed of the impeller in real time to obtain a pressure-speed coordinate point; controlling the PID regulator to select a preset speed regulation mode and controlling the action of the electric valve according to the position of the pressure-speed coordinate point in a preset pressure-speed coordinate diagram to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure; wherein the pressure-speed coordinate diagram includes a normal operating area of ​​the compressor, and the coordinate points of the preset speed and the preset pressure are located in the normal operating area of ​​the compressor. The present invention controls the PID regulator to select a preset speed regulation mode and controls the action of the electric valve to keep the pressure of the air inlet and the rotation speed of the impeller stably in the normal operating area of ​​the compressor, so that surge does not occur.

Description

Technical Field

[0001] The present invention relates to the field of centrifugal compressors, and in particular to a centrifugal compressor surge protection method, device, equipment and storage medium. Background Art

[0002] At present, when the flow rate of the centrifugal compressor intake pipe is reduced, surge is prone to occur, and air backflows from the exhaust port, causing the machine to vibrate periodically, causing damage to the machine, affecting the flow range and working efficiency of the compression system, and also directly affecting the reliability and safety of the system. Summary of the invention

[0003] The present invention provides a centrifugal compressor surge protection method, device, equipment and storage medium to solve the problem that the centrifugal compressor in the prior art is prone to surge.

[0004] In order to solve the above problems, the present invention adopts the following technical solutions: including:

[0005] In a first aspect, the present invention provides a centrifugal compressor surge protection method, the method is applied to a compressor, the compressor comprises a PID regulator, an electric valve, an impeller and an intake pipe, the intake pipe comprises an intake port, the electric valve comprises a valve body, the valve body is arranged on the intake port, the PID regulator is connected to the impeller, the impeller is located on one side of the intake pipe, the method comprises:

[0006] Acquire the pressure of the air inlet and the rotation speed of the impeller in real time to obtain a pressure-rotation speed coordinate point;

[0007] According to the position of the pressure-speed coordinate point in the preset pressure-speed coordinate diagram, the PID regulator is controlled to select a preset speed regulation mode and the action of the electric valve is controlled to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure; wherein the pressure-speed coordinate diagram includes a normal operating area of ​​the compressor, and the coordinate points of the preset speed and the preset pressure are located in the normal operating area of ​​the compressor.

[0008] A further technical solution is that before obtaining the pressure of the air inlet and the speed of the impeller in real time and obtaining the pressure-speed coordinate point, the method further includes:

[0009] Control the impeller to rotate at various speeds and control the electric valve to close to adjust the cross-sectional area of ​​the air inlet. If surge occurs at the air inlet, record the speed of the impeller and the pressure of the air inlet when the surge occurs to obtain the surge speed-pressure coordinate point;

[0010] Constructing a pressure-speed coordinate system, and constructing a surge line in the pressure-speed coordinate system according to the surge speed pressure coordinate point;

[0011] Constructing a surge warning line and an electric valve closing line according to the surge line;

[0012] A pressure-speed coordinate diagram is obtained according to the pressure-speed coordinate system, the surge line, the surge warning line and the electric valve closing line, and a normal operating area of ​​the compressor is determined in the pressure-speed coordinate diagram according to the surge warning line and the electric valve closing line.

[0013] A further technical solution is that the surge warning line and the electric valve closing line are constructed according to the surge line, including:

[0014] A surge warning line is constructed according to the surge line, and an electric valve closing line is constructed according to the surge warning line.

[0015] A further technical solution is that the speed regulation mode includes an acceleration regulation mode, and the PID regulator is controlled to select a preset speed regulation mode and control the action of the electric valve according to the position of the pressure-speed coordinate point in the preset pressure-speed coordinate diagram to adjust the speed of the impeller and the pressure of the air inlet to the preset speed and preset pressure, including:

[0016] Upon receiving a compressor start instruction, the PID regulator is controlled to select the acceleration adjustment mode to accelerate the speed of the impeller until the speed reaches a preset speed, and during the process of accelerating the speed of the impeller, it is determined in real time whether the pressure-speed coordinate point is between the surge line and the surge warning line;

[0017] If the pressure-speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure at the air intake, until the pressure-speed coordinate point is below the electric valve closing line, then the electric valve is controlled to close the valve body.

[0018] A further technical solution is that the speed regulation mode also includes a constant pressure regulation mode, and the PID regulator is controlled to select a preset speed regulation mode and control the action of the electric valve according to the position of the pressure-speed coordinate point in the preset pressure-speed coordinate diagram to adjust the speed of the impeller and the pressure of the air inlet to the preset speed and preset pressure, and also includes:

[0019] If the speed of the impeller is accelerated to a preset speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the speed of the impeller, and the position of the pressure-speed coordinate point in the pressure-speed coordinate diagram is determined in real time;

[0020] If the pressure-speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure of the air inlet and control the speed of the impeller to increase, until the pressure-speed coordinate point is below the electric valve closing line, and then the electric valve is controlled to close the valve body.

[0021] A further technical solution is that if the speed of the impeller is accelerated to a preset speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the speed of the impeller, and the position of the pressure-speed coordinate point in the pressure-speed coordinate diagram is determined in real time, and the method further includes:

[0022] If the pressure-speed coordinate point is in the normal operating area of ​​the compressor, it is determined in real time whether the pressure of the air inlet rises in the normal operating area of ​​the compressor;

[0023] If the pressure at the air inlet increases within the normal operating area of ​​the compressor, the increase value of the pressure at the air inlet is calculated and the PID regulator is controlled according to the increase value to reduce the speed of the impeller so that the pressure at the air inlet remains constant.

[0024] A further technical solution is that if the pressure-speed coordinate point is in the normal operating area of ​​the compressor, after determining in real time whether the pressure of the air inlet rises, the method further includes:

[0025] If the pressure at the air inlet drops within the normal operating range of the compressor, the drop value of the pressure at the air inlet is calculated and the PID regulator is controlled according to the drop value to increase the speed of the impeller so that the pressure at the air inlet remains constant.

[0026] In a second aspect, the present invention further provides a centrifugal compressor surge protection device, comprising a unit for executing the method as described in the first aspect.

[0027] In a third aspect, the present invention further provides an electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0028] Memory, used to store computer programs;

[0029] The processor is used to implement the steps of the method described in the first aspect when executing the program stored in the memory.

[0030] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method described in the first aspect.

[0031] The above technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0032] The method described in the embodiment of the present invention is applied to a compressor, wherein the compressor includes a PID regulator, an electric valve, an impeller and an intake pipe, wherein the intake pipe includes an intake port, the electric valve includes a valve body, the valve body is arranged on the intake port, the PID regulator is connected to the impeller, and the impeller is located on one side of the intake pipe, and the method includes: obtaining the pressure of the intake port and the speed of the impeller in real time to obtain a pressure-speed coordinate point; controlling the PID regulator to select a preset speed regulation mode and controlling the action of the electric valve according to the position of the pressure-speed coordinate point in a preset pressure-speed coordinate diagram to adjust the speed of the impeller and the pressure of the intake port to a preset speed and a preset pressure; wherein the pressure-speed coordinate diagram includes a normal operating area of ​​the compressor, and the coordinate points of the preset speed and the preset pressure are located in the normal operating area of ​​the compressor. Therefore, by controlling the PID regulator to select the preset speed regulation mode and controlling the action of the electric valve, the pressure of the intake port and the speed of the impeller are stably maintained in the normal operating area of ​​the compressor, so that surge does not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] Figure 1 A schematic flow chart of a centrifugal compressor surge protection method provided in Example 1 of the present invention;

[0036] Figure 2 A structural block diagram of a centrifugal compressor surge protection device provided in Example 2 of the present invention;

[0037] Figure 3 A schematic diagram of the structure of an electronic device provided in Embodiment 3 of the present invention;

[0038] Figure 4Schematic diagram of the pressure-speed coordinate diagram in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to more fully understand the technical content of the present invention, the technical solution of the present invention is further introduced and illustrated in conjunction with specific embodiments below, but is not limited thereto.

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0042] It should also be understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0043] Example 1

[0044] See also Figure 1 , combined with Figure 4 As shown, Figure 1 A flow chart of a centrifugal compressor surge protection method provided in Example 1 of the present invention. The method is applied to a compressor, wherein the compressor comprises a PID regulator, an electric valve, an impeller, and an intake pipe, wherein the intake pipe comprises an intake port, the electric valve comprises a valve body, and the valve body is arranged on the intake port, the PID regulator is connected to the impeller, and the impeller is located on one side of the intake pipe. Specifically, Figure 1 As shown, the method includes the following steps S101-S102.

[0045] S101, acquiring the pressure of the air inlet and the rotation speed of the impeller in real time to obtain a pressure-rotation speed coordinate point.

[0046] Specifically, the control unit in the compressor obtains the current impeller speed in real time through the driver, and obtains the intake pressure in real time through the intake pressure sensor, and obtains the pressure-speed coordinate point at each moment based on the intake pressure and the impeller speed at each moment.

[0047] S102, controlling the PID regulator to select a preset speed regulation mode and controlling the action of the electric valve according to the position of the pressure-speed coordinate point in the preset pressure-speed coordinate diagram, so as to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure.

[0048] Specifically, the pressure-speed coordinate diagram includes a normal operating area of ​​the compressor, and the coordinate points of the preset speed and the preset pressure are located in the normal operating area of ​​the compressor. Therefore, by controlling the PID regulator to select the preset speed regulation mode and controlling the action of the electric valve, the pressure of the air inlet and the speed of the impeller are stably maintained in the normal operating area of ​​the compressor, so that the compressor will not surge. The preset speed and preset pressure are both set by the user, and are the speed and pressure at which the compressor will not surge when it is in a stable working state.

[0049] In one embodiment, before obtaining the pressure of the air inlet and the speed of the impeller in real time and obtaining the pressure-speed coordinate point, the method further includes:

[0050] Control the impeller to rotate at various speeds and control the electric valve to close to adjust the cross-sectional area of ​​the air inlet. If surge occurs at the air inlet, record the speed of the impeller and the pressure of the air inlet when the surge occurs to obtain the surge speed-pressure coordinate point;

[0051] Constructing a pressure-speed coordinate system, and constructing a surge line in the pressure-speed coordinate system according to the surge speed pressure coordinate point;

[0052] Constructing a surge warning line and an electric valve closing line according to the surge line;

[0053] A pressure-speed coordinate diagram is obtained according to the pressure-speed coordinate system, the surge line, the surge warning line and the electric valve closing line, and a normal operating area of ​​the compressor is determined in the pressure-speed coordinate diagram according to the surge warning line and the electric valve closing line.

[0054] Specifically, the control unit in the compressor controls the impeller to rotate at various speeds through a driver and adjusts the cross-sectional area of ​​the air inlet through an electric valve to obtain the speed of the impeller and the pressure of the air inlet when the compressor surges. The pressure data measured by the air inlet pressure sensor is used as the feedback pressure of the PID regulator to keep the pressure of the air inlet stable. Compared with the flow meter, the air inlet pressure sensor has a low cost and participates in more functions. The control unit in the compressor records the speed of the impeller and the pressure of the air inlet when surge occurs, and obtains the surge speed-pressure coordinate point, with the speed as the independent variable x-axis and the air inlet pressure as the dependent variable y The pressure-speed coordinate system is constructed by the axis, and a surge line is constructed in the pressure-speed coordinate system according to the surge speed pressure coordinate point; after the surge line is constructed in the pressure-speed coordinate system, a surge warning line and an electric valve closing line are constructed according to the surge line; finally, a pressure-speed coordinate diagram is obtained according to the pressure-speed coordinate system, the surge line, the surge warning line and the electric valve closing line, and the normal operation area of ​​the compressor is determined in the pressure-speed coordinate diagram according to the surge warning line and the electric valve closing line. The normal operation area of ​​the compressor is the area between the surge warning line and the electric valve closing line. Among them, when the pressure-speed coordinate point obtained in real time is between the surge warning line and the electric valve closing line, the electric valve does not act to prevent the electric valve from overheating due to frequent action of the electric valve.

[0055] In one embodiment, constructing a surge warning line and an electric valve closing line according to the surge line includes:

[0056] A surge warning line is constructed according to the surge line, and an electric valve closing line is constructed according to the surge warning line.

[0057] Specifically, the control unit in the compressor constructs the surge warning line and the electric valve closing line according to the surge line by first constructing the surge warning line according to the surge line, determining the surge warning line, and then constructing the electric valve closing line according to the surge warning line. The surge warning line is obtained by translating the position of the surge line in the pressure-speed coordinate system downward, and the electric valve control line is obtained by translating the position of the surge warning line in the pressure-speed coordinate system downward.

[0058] In one embodiment, the speed regulation mode includes an acceleration regulation mode, and the PID regulator is controlled to select a preset speed regulation mode and control the action of the electric valve according to the position of the pressure-speed coordinate point in a preset pressure-speed coordinate diagram to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure, including:

[0059] Upon receiving a compressor start instruction, the PID regulator is controlled to select the acceleration adjustment mode to accelerate the speed of the impeller until the speed reaches a preset speed, and during the process of accelerating the speed of the impeller, it is determined in real time whether the pressure-speed coordinate point is between the surge line and the surge warning line;

[0060] If the pressure-speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure at the air intake, until the pressure-speed coordinate point is below the electric valve closing line, then the electric valve is controlled to close the valve body.

[0061] Specifically, the acceleration regulation mode is used during the startup phase of the compressor in order to quickly reach the standard inlet pressure and to quickly make the impeller speed reach the preset speed from zero. The preset speed is set by the user. In the acceleration regulation mode, the PID regulator maintains the maximum amplitude regulation to rapidly increase the speed of the impeller. During the startup phase of the compressor, the PID regulator does not have constant pressure control, but only a maximum output. At this time, the pressure control is mainly carried out by the electric valve. When the compressor is in the startup phase, the speed of the impeller rises rapidly, causing the pressure to rise rapidly. At this time, the pressure-speed coordinate point is easy to reach the coordinate on the surge line, thereby triggering compressor surge. At this time, when the pressure-speed coordinate point is between the surge line and the surge warning line, the valve body is opened by the electric valve to increase the area of ​​the inlet, thereby increasing the inlet flow, delaying the pressure rise, and ensuring that the pressure-speed coordinate point does not reach the coordinate on the surge line, thereby ensuring that surge does not occur during the startup phase of the compressor.

[0062] In one embodiment, the speed regulation mode further includes a constant pressure regulation mode, and the PID regulator is controlled to select a preset speed regulation mode and control the action of the electric valve according to the position of the pressure-speed coordinate point in the preset pressure-speed coordinate diagram to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure, and further includes:

[0063] If the speed of the impeller is accelerated to a preset speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the speed of the impeller, and the position of the pressure-speed coordinate point in the pressure-speed coordinate diagram is determined in real time;

[0064] If the pressure-speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure of the air inlet and control the speed of the impeller to increase, until the pressure-speed coordinate point is below the electric valve closing line, and then the electric valve is controlled to close the valve body.

[0065] Specifically, in the acceleration regulation mode, the PID regulator maintains the maximum amplitude regulation to rapidly increase the speed of the impeller. When the speed of the impeller accelerates to the preset speed, that is, the compressor reaches a stable state, the PID regulator is controlled to select the constant pressure regulation mode to regulate the speed of the impeller. Whether in the compressor startup stage or the constant pressure regulation stage when the compressor reaches a stable state, the electric valve acts according to the surge warning line and the electric valve closing line. In the compressor startup stage, the electric valve increases the speed and pressure of the compressor along the surge warning line, and still performs surge protection after the compressor enters a stable state. Therefore, even after the compressor enters a stable state, if the pressure-speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure of the air inlet and control the speed of the impeller to increase, so that the pressure-speed coordinate point is away from the surge line until the pressure-speed coordinate point is below the electric valve closing line, and then the electric valve is controlled to close the valve body, thereby preventing the accidental surge phenomenon when the compressor is in a stable state. Of course, there is a maximum speed limit for the impeller, which does not mean that the speed will continue to increase as the pressure decreases.

[0066] In one embodiment, if the speed of the impeller is accelerated to a preset speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the speed of the impeller, and the position of the pressure-speed coordinate point in the pressure-speed coordinate diagram is determined in real time, and the method further includes:

[0067] If the pressure-speed coordinate point is in the normal operating area of ​​the compressor, it is determined in real time whether the pressure of the air inlet rises in the normal operating area of ​​the compressor;

[0068] If the pressure at the air inlet increases within the normal operating area of ​​the compressor, the increase value of the pressure at the air inlet is calculated and the PID regulator is controlled according to the increase value to reduce the speed of the impeller so that the pressure at the air inlet remains constant.

[0069] Specifically, after the compressor reaches the constant pressure regulation stage after the startup stage, when the speed of the impeller has accelerated to the preset speed, the PID regulator is controlled to perform constant pressure regulation. At this time, the electric valve will basically remain closed, and the adjustment of the electric valve will be very small. The final state is: the speed is constant, the pressure is also constant, and the electric valve is closed. At this time, the pressure-speed coordinate point is adjusted by the electric valve between the surge line and the surge warning line, that is, when the PID regulator performs constant pressure regulation, the pressure-speed coordinate point basically runs in the normal operating area of ​​the compressor. At this time, it is only necessary to control the PID regulator to perform slight adjustments to keep the pressure of the air inlet constant. Therefore, when the pressure-speed coordinate point is in the normal operating area of ​​the compressor, it is judged in real time whether the pressure of the air inlet rises in the normal operating area of ​​the compressor. When the pressure of the air inlet rises in the normal operating area of ​​the compressor, the rising value of the pressure of the air inlet is calculated and the PID regulator is controlled to reduce the speed of the impeller according to the rising value to keep the pressure of the air inlet constant.

[0070] This method provides surge protection for the compressor while allowing the compressor inlet to quickly reach a specified pressure, and ensures the stability of the inlet pressure through constant pressure control, ensuring the stability of the inlet pressure and the impeller speed, thereby providing a stable air volume.

[0071] In one embodiment, if the pressure-speed coordinate point is in the normal operating area of ​​the compressor, after determining in real time whether the pressure of the air inlet rises, the method further includes:

[0072] If the pressure at the air inlet drops within the normal operating range of the compressor, the drop value of the pressure at the air inlet is calculated and the PID regulator is controlled according to the drop value to increase the speed of the impeller so that the pressure at the air inlet remains constant.

[0073] Specifically, when the pressure-speed coordinate point is in the normal operating area of ​​the compressor, it is determined in real time whether the pressure of the air inlet rises within the normal operating area of ​​the compressor; when the pressure of the air inlet decreases within the normal operating area of ​​the compressor, the decrease value of the pressure of the air inlet is calculated and the PID regulator is controlled according to the decrease value to increase the speed of the impeller so that the pressure of the air inlet remains constant.

[0074] In a specific embodiment, the method is applied to a high-speed air knife machine. The air knife machine system includes a high-speed motor, a frequency converter, an electric air intake valve, and a machine head. The negative pressure (i.e., air intake pressure) generated by the air intake of the high-speed fan is used to fix the workpiece on the machine tool and process it. The control card software can set the pressure speed point coordinates to form a surge line, a surge warning line, and an electric valve closing line to divide the speed and pressure coordinates into different areas. According to the position of the current pressure speed point in the coordinate system, the electric air intake valve performs different actions to adjust the position of the pressure speed point to avoid surge.

[0075] The air inlet of the fan is connected to the machine tool workbench through a pipeline. During the startup phase of the machine tool, the motor speed increases very quickly and the negative pressure in the pipeline increases quickly. When the pressure and flow points reach the surge zone, surge will occur. Therefore, when the pressure-speed point reaches between the surge warning line and the surge line, the electric air inlet valve is controlled to open, increasing the air inlet area and reducing the air inlet pressure to avoid surge. When the pressure-speed coordinate point is below the electric valve closing line, the electric valve automatically closes. During stable operation of the machine tool, the electric valve is closed. Since the speed stability and the air inlet area change little, the air inlet pressure can be adjusted through closed-loop control to ensure the working pressure requirement. After the workpiece is processed, the material change operation is performed without stopping the machine tool. When the workpiece is removed, the air inlet area becomes larger, the air inlet pressure decreases, and the fan operation coordinates are far away from the surge zone. When discharging, the air inlet area quickly decreases, causing the air inlet pressure to rise rapidly. When the pressure-speed point coordinate is above the surge warning line, the electric valve opens to avoid surge.

[0076] Example 2

[0077] like Figure 2 As shown, an embodiment of the present invention further provides a centrifugal compressor surge protection device 400 , and the device 400 includes a first acquisition unit 401 and a first control unit 402 .

[0078] The first acquisition unit 401 is used to acquire the pressure of the air inlet and the rotation speed of the impeller in real time to obtain a pressure-rotation speed coordinate point.

[0079] The first control unit 402 is used to control the PID regulator to select a preset speed regulation mode and control the action of the electric valve according to the position of the pressure-speed coordinate point in a preset pressure-speed coordinate diagram, so as to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure; wherein the pressure-speed coordinate diagram includes a normal operating area of ​​the compressor, and the coordinate points of the preset speed and the preset pressure are located in the normal operating area of ​​the compressor.

[0080] In one embodiment, before obtaining the pressure of the air inlet and the speed of the impeller in real time and obtaining the pressure-speed coordinate point, the method further includes:

[0081] Control the impeller to rotate at various speeds and control the electric valve to close to adjust the cross-sectional area of ​​the air inlet. If surge occurs at the air inlet, record the speed of the impeller and the pressure of the air inlet when the surge occurs to obtain the surge speed-pressure coordinate point;

[0082] Constructing a pressure-speed coordinate system, and constructing a surge line in the pressure-speed coordinate system according to the surge speed pressure coordinate point;

[0083] Constructing a surge warning line and an electric valve closing line according to the surge line;

[0084] A pressure-speed coordinate diagram is obtained according to the pressure-speed coordinate system, the surge line, the surge warning line and the electric valve closing line, and a normal operating area of ​​the compressor is determined in the pressure-speed coordinate diagram according to the surge warning line and the electric valve closing line.

[0085] In one embodiment, constructing a surge warning line and an electric valve closing line according to the surge line includes:

[0086] A surge warning line is constructed according to the surge line, and an electric valve closing line is constructed according to the surge warning line.

[0087] In one embodiment, the speed regulation mode includes an acceleration regulation mode, and the PID regulator is controlled to select a preset speed regulation mode and control the action of the electric valve according to the position of the pressure-speed coordinate point in a preset pressure-speed coordinate diagram to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure, including:

[0088] Upon receiving a compressor start instruction, the PID regulator is controlled to select the acceleration adjustment mode to accelerate the speed of the impeller until the speed reaches a preset speed, and during the process of accelerating the speed of the impeller, it is determined in real time whether the pressure-speed coordinate point is between the surge line and the surge warning line;

[0089] If the pressure-speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure at the air intake, until the pressure-speed coordinate point is below the electric valve closing line, then the electric valve is controlled to close the valve body.

[0090] In one embodiment, the speed regulation mode further includes a constant pressure regulation mode, and the PID regulator is controlled to select a preset speed regulation mode and control the action of the electric valve according to the position of the pressure-speed coordinate point in the preset pressure-speed coordinate diagram to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure, and further includes:

[0091] If the speed of the impeller is accelerated to a preset speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the speed of the impeller, and the position of the pressure-speed coordinate point in the pressure-speed coordinate diagram is determined in real time;

[0092] If the pressure-speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure of the air inlet and control the speed of the impeller to increase, until the pressure-speed coordinate point is below the electric valve closing line, and then the electric valve is controlled to close the valve body.

[0093] In one embodiment, if the speed of the impeller is accelerated to a preset speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the speed of the impeller, and the position of the pressure-speed coordinate point in the pressure-speed coordinate diagram is determined in real time, and the method further includes:

[0094] If the pressure-speed coordinate point is in the normal operating area of ​​the compressor, it is determined in real time whether the pressure of the air inlet rises in the normal operating area of ​​the compressor;

[0095] If the pressure at the air inlet increases within the normal operating area of ​​the compressor, the increase value of the pressure at the air inlet is calculated and the PID regulator is controlled according to the increase value to reduce the speed of the impeller so that the pressure at the air inlet remains constant.

[0096] In one embodiment, if the pressure-speed coordinate point is in the normal operating area of ​​the compressor, after determining in real time whether the pressure of the air inlet rises, the method further includes:

[0097] If the pressure at the air inlet drops within the normal operating range of the compressor, the drop value of the pressure at the air inlet is calculated and the PID regulator is controlled according to the drop value to increase the speed of the impeller so that the pressure at the air inlet remains constant.

[0098] Example 3

[0099] See also Figure 3 An embodiment of the present invention further provides an electronic device, including a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114.

[0100] Memory 113, used for storing computer programs;

[0101] The processor 111 is used to execute the program stored in the memory 113 to implement the centrifugal compressor surge protection method provided in Example 1.

[0102] The embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by the processor 111, the steps of the centrifugal compressor surge protection method provided in Embodiment 1 are implemented.

[0103] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0104] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features invented herein.

Claims

1. A centrifugal compressor surge protection method, characterized in that: The method is applied to a compressor, the compressor comprising a PID regulator, an electric valve, an impeller and an intake pipe, the intake pipe comprising an intake port, the electric valve comprising a valve body, the valve body being arranged on the intake port, the PID regulator being connected to the impeller, the impeller being located at one side of the intake pipe, the method comprising: constructing a pressure-speed coordinate system, and constructing a surge line in the pressure-speed coordinate system; Constructing a surge warning line and an electric valve closing line according to the surge line; A pressure-speed coordinate diagram is obtained according to the pressure-speed coordinate system, the surge line, the surge warning line and the electric valve closing line, and a normal operating area of ​​the compressor is determined in the pressure-speed coordinate diagram according to the surge warning line and the electric valve closing line; the pressure of the air inlet and the speed of the impeller are obtained in real time to obtain a pressure-speed coordinate point; According to the position of the pressure-speed coordinate point in the preset pressure-speed coordinate diagram, the PID regulator is controlled to select a preset speed regulation mode and the electric valve is controlled to act, so as to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure; wherein the pressure-speed coordinate diagram includes a normal operating area of ​​the compressor, and the coordinate points of the preset speed and the preset pressure are located in the normal operating area of ​​the compressor; When the pressure-speed coordinate point reaches between the surge warning line and the surge line, the electric valve is controlled to be opened, and when the pressure-speed coordinate point is below the electric valve closing line, the electric valve is closed.

2. The centrifugal compressor surge protection method according to claim 1, characterized in that: Before obtaining the pressure of the air inlet and the speed of the impeller in real time to obtain the pressure-speed coordinate point, the method further includes: Control the impeller to rotate at various speeds and control the electric valve to close to adjust the cross-sectional area of ​​the air inlet. If surge occurs at the air inlet, record the speed of the impeller and the pressure of the air inlet when the surge occurs to obtain the surge speed-pressure coordinate point; A pressure-speed coordinate system is constructed, and a surge line is constructed in the pressure-speed coordinate system according to the surge speed pressure coordinate point.

3. The centrifugal compressor surge protection method according to claim 1, characterized in that: The constructing of a surge warning line and an electric valve closing line according to the surge line comprises: A surge warning line is constructed according to the surge line, and an electric valve closing line is constructed according to the surge warning line.

4. The centrifugal compressor surge protection method according to claim 1, characterized in that: The speed regulation mode includes an acceleration regulation mode, and the PID regulator is controlled to select a preset speed regulation mode and control the action of the electric valve according to the position of the pressure-speed coordinate point in the preset pressure-speed coordinate diagram to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure, including: Upon receiving a compressor start instruction, the PID regulator is controlled to select the acceleration adjustment mode to accelerate the speed of the impeller until the speed reaches a preset speed, and during the process of accelerating the speed of the impeller, it is determined in real time whether the pressure-speed coordinate point is between the surge line and the surge warning line; If the pressure-speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure at the air intake, until the pressure-speed coordinate point is below the electric valve closing line, then the electric valve is controlled to close the valve body.

5. The centrifugal compressor surge protection method according to claim 4, characterized in that: The speed regulation mode also includes a constant pressure regulation mode, wherein the PID regulator is controlled to select a preset speed regulation mode and the electric valve is controlled to operate according to the position of the pressure-speed coordinate point in a preset pressure-speed coordinate diagram, so as to adjust the speed of the impeller and the pressure of the air inlet to a preset speed and a preset pressure, and further includes: If the speed of the impeller is accelerated to a preset speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the speed of the impeller, and the position of the pressure-speed coordinate point in the pressure-speed coordinate diagram is determined in real time; If the pressure-speed coordinate point is between the surge line and the surge warning line, the electric valve is controlled to open the valve body to reduce the pressure of the air inlet and control the speed of the impeller to increase, until the pressure-speed coordinate point is below the electric valve closing line, and then the electric valve is controlled to close the valve body.

6. The centrifugal compressor surge protection method according to claim 5, characterized in that: If the speed of the impeller is accelerated to a preset speed, the PID regulator is controlled to select the constant pressure regulation mode to regulate the speed of the impeller, and the position of the pressure-speed coordinate point in the pressure-speed coordinate diagram is determined in real time. After that, the method further includes: If the pressure-speed coordinate point is in the normal operating area of ​​the compressor, it is determined in real time whether the pressure of the air inlet rises in the normal operating area of ​​the compressor; If the pressure at the air inlet increases within the normal operating area of ​​the compressor, the increase value of the pressure at the air inlet is calculated and the PID regulator is controlled according to the increase value to reduce the speed of the impeller so that the pressure at the air inlet remains constant.

7. The centrifugal compressor surge protection method according to claim 6, characterized in that: If the pressure-speed coordinate point is in the normal operating area of ​​the compressor, after determining in real time whether the pressure of the air inlet rises, the method further includes: If the pressure at the air inlet drops within the normal operating range of the compressor, the drop value of the pressure at the air inlet is calculated and the PID regulator is controlled according to the drop value to increase the speed of the impeller so that the pressure at the air inlet remains constant.

8. A centrifugal compressor surge protection device, characterized in that: The method comprises a unit for executing the method according to any one of claims 1 to 7.

9. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, for implementing the steps of the method described in any one of claims 1 to 7 when executing a program stored in a memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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