Method, device, medium and equipment for identifying operating power of reciprocating compressor

Abstract

The present invention provides a method, device, medium and equipment for identifying the operating power of a reciprocating compressor, including: obtaining the valve state information of each cylinder in the reciprocating compressor within a detection period; determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder. By determining the working state of each cylinder within the detection period through the valve state information and further combining it with the rated power of each cylinder, the total power of the reciprocating compressor can be accurately identified, ensuring the management accuracy of the reciprocating compressor.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and more particularly, to a method, device, medium and equipment for identifying the operating power of a reciprocating compressor. Background Art

[0002] A reciprocating compressor is a type of compressor that uses the reciprocating motion of a piston within a cylinder to cause the volume of the cylinder to change periodically and achieve gas pressurization and transportation. It belongs to the positive displacement compressor type. The reciprocating compressor drives the connecting rod through the crankshaft, and the connecting rod drives the piston to move. The working process of compressing gas can be divided into four processes: expansion, suction, compression, and exhaust.

[0003] One management element of a reciprocating compressor is its operating power. How to identify the operating power of a reciprocating compressor during its operation has become a difficult problem that concerns the technology in this field. Summary of the Invention

[0004] The purpose of the present invention is to provide a method, device, medium and equipment for identifying the operating power of a reciprocating compressor to improve the above problems.

[0005] To achieve the above purpose, the technical solutions adopted in the embodiments of the present invention are as follows:

[0006] In a first aspect, an embodiment of the present invention provides a method for identifying the operating power of a reciprocating compressor, the method comprising:

[0007] Obtaining valve state information of each cylinder in the reciprocating compressor within a detection period;

[0008] Determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder.

[0009] In a second aspect, an embodiment of the present invention provides a device for identifying the operating power of a reciprocating compressor, the device comprising:

[0010] A first processing unit for obtaining valve state information of each cylinder in the reciprocating compressor within a detection period;

[0011] A second processing unit for determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder.

[0012] In a third aspect, an embodiment of the present invention provides a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above method is implemented.

[0013] Fourth aspect, an embodiment of the present invention provides an electronic device, which includes: a processor and a memory, where the memory is used to store one or more programs; when the one or more programs are executed by the processor, the above-mentioned method is implemented.

[0014] Compared with the prior art, a method, device, medium and equipment for identifying the operating power of a reciprocating compressor provided by an embodiment of the present invention include: obtaining valve state information of each cylinder in the reciprocating compressor within a detection period; determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder. By determining the working state of each cylinder within the detection period through the valve state information and further combining it with the rated power of each cylinder, the total power of the reciprocating compressor can be accurately identified, ensuring the management accuracy of the reciprocating compressor.

[0015] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the electronic device provided by the embodiment of the present invention.

[0018] Figure 2 It is one of the flow schematic diagrams of the method for identifying the operating power of the reciprocating compressor provided by the embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of valve state transformation provided by the embodiment of the present invention.

[0020] Figure 4 It is the second of the flow schematic diagrams of the method for identifying the operating power of the reciprocating compressor provided by the embodiment of the present invention.

[0021] Figure 5 It is the indicator diagram provided by the embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of the units of the device for identifying the operating power of the reciprocating compressor provided by the embodiment of the present invention.

[0023] In the figure: 10 - processor; 11 - memory; 12 - bus; 13 - communication interface; 701 - first processing unit; 702 - second processing unit. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0026] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0027] It should be noted that in this document, 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 actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0029] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] The following will, with reference to the accompanying drawings, elaborate on some embodiments of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0031] The power monitoring of the reciprocating compressor can be carried out from the following two dimensions. One is to directly use parameters such as the power and the intake and exhaust volumes of the DCS for monitoring. The other is that when dynamic pressure sensors are installed on the cylinders, the power of the unit can be calculated by using the changes in real-time dynamic pressure, volume, and key phase data. However, it is difficult to access the data of the above two methods in the monitoring of on-site units. Especially, the installation of dynamic pressure sensors is relatively complex. In this case, it is difficult to obtain the changes in the operating power of the reciprocating unit.

[0032] The embodiment of the present invention provides a monitoring system for a reciprocating compressor. The monitoring system includes an acquisition station and a plurality of state monitoring sensors. At least one state monitoring sensor needs to be arranged for at least one intake valve of each cylinder (working cylinder) of the reciprocating compressor, and at least one state monitoring sensor needs to be arranged for at least one exhaust valve of each cylinder (working cylinder) of the reciprocating compressor.

[0033] The state monitoring sensor can be, but is not limited to, a sound sensor, a vibration sensor, an acceleration sensor, an impact pulse sensor, etc. The state monitoring sensor can be, but is not limited to, arranged on the valve covers of the intake valve and the exhaust valve.

[0034] By monitoring the sound of the air valve, the impact sounds of the opening and closing of each air valve can be clearly identified. On a single row of the reciprocating compressor, even for a double-acting cylinder, the transmission effect between the impact sounds of each air valve is relatively weak, and the sound of the opening or closing of this air valve is still the main one. The transmission of the opening and closing sounds of the remaining air valves to the sound sensor of this air valve is relatively weak. The sound impact at the opening moment of the intake valve and the exhaust valve is very large, which can significantly distinguish the impact sound of the valve where the sound sensor is located from the transmission of the opening and closing sounds of the remaining valves. Therefore, the exhaust volume of the unit can be converted by using the closing moment of the intake valve monitored by the sound sensor, and the theoretical indicator diagram can be corrected synchronously, and the power of the unit can be calculated.

[0035] The status monitoring sensors are all communicatively connected to the acquisition station to transmit the obtained valve status information to the acquisition station.

[0036] In an alternative embodiment, the monitoring system further includes a keyphasor sensor and a dynamic pressure sensor.

[0037] The keyphasor sensor is a proximity switch type trigger sensor. It is installed on the transmission device between the motor and the crankshaft, such as near the flywheel, through a mounting bracket. A trigger block (such as an iron block) is installed on the flywheel. The keyphasor sensor uses the trigger block to collect the crankshaft rotation speed information and the crankshaft rotation angle information. The keyphasor sensor is communicatively connected to the acquisition station and can transmit the collected crankshaft rotation speed information and crankshaft rotation angle information to the acquisition station.

[0038] The dynamic pressure sensor can be installed in the cylinder pressure tapping reserved hole or the intake valve pressure tapping hole or the exhaust valve pressure tapping hole through a stop valve. The dynamic pressure sensor is communicatively connected to the acquisition station. The dynamic pressure sensor is used to obtain the real-time dynamic pressure information inside the cylinder and transmit the obtained real-time dynamic pressure information inside the cylinder to the acquisition station.

[0039] It should be noted that the acquisition station can synchronously collect the valve status information transmitted by the status monitoring sensors, the real-time dynamic pressure information inside the cylinder transmitted by the dynamic pressure sensors, and the crankshaft rotation angle information transmitted by the keyphasor sensors according to the signal synchronous acquisition period. This signal synchronous acquisition period corresponds to the crankshaft rotation speed information, that is, the duration of one revolution of the crankshaft is determined according to the crankshaft rotation speed information and used as the signal synchronous acquisition period.

[0040] Alternatively, when the crankshaft rotation angle information is a preset angle, the valve status information transmitted by the status monitoring sensors and the real-time dynamic pressure information inside the cylinder transmitted by the dynamic pressure sensors are synchronously collected.

[0041] The embodiment of the present invention provides a method for identifying the operating power of a reciprocating compressor. Based on the information collected by the acquisition station in the above monitoring system, the operating power of the reciprocating compressor can be accurately identified. The embodiment of the present invention provides an electronic device, which can be the above acquisition station, or a mobile phone, a computer, and a server device communicatively connected to the acquisition station. Please refer to Figure 1 , the structural schematic diagram of the electronic device. The electronic device includes a processor 10, a memory 11, and a bus 12. The processor 10 and the memory 11 are connected through the bus 12. The processor 10 is used to execute the executable module stored in the memory 11, such as a computer program.

[0042] The processor 10 may be an integrated circuit chip having the ability to process signals. In the implementation process, each step of the method for identifying the operating power of a reciprocating compressor may be completed by an integrated logic circuit of hardware or software instructions in the processor 10. The above-mentioned processor 10 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, or discrete hardware components.

[0043] The memory 11 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory.

[0044] The bus 12 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus. Figure 1 Although only one bidirectional arrow is used in the figure, it does not mean that there is only one bus 12 or only one type of bus 12 .

[0045] The memory 11 is used to store programs, such as programs corresponding to the operating power identification device of a reciprocating compressor. The operating power identification device of a reciprocating compressor includes at least one software function module that can be stored in the memory 11 in the form of software or firmware or fixed in the operating system (OS) of the electronic device. After receiving the execution instruction, the processor 10 executes the program to implement the operating power identification method of the reciprocating compressor.

[0046] Possibly, the electronic device provided by the embodiment of the present invention further includes a communication interface 13. The communication interface 13 is connected to the processor 10 via a bus.

[0047] It should be understood that Figure 1The structure shown is only a schematic diagram of a part of the electronic device, and the electronic device may further include more or fewer components than those shown in Figure 1 or have a different configuration from that shown in Figure 1 . Figure 1 Each component shown in can be implemented by hardware, software, or a combination thereof.

[0048] A method for identifying the operating power of a reciprocating compressor provided by an embodiment of the present invention can be, but is not limited to, applied to the Figure 1 shown electronic device. For the specific process, please refer to Figure 2 . The identification of the operating power of the reciprocating compressor includes: S10 and S20, which are specifically described as follows.

[0049] S10, obtaining the valve state information of each cylinder in the reciprocating compressor within a detection period.

[0050] Among them, the valve state information can be the information monitored by the state monitoring sensors deployed on the valve covers of the intake valves and the exhaust valves of the cylinders.

[0051] It should be noted that when the state monitoring sensor is a sound sensor, the sound sensor can also be deployed at positions adjacent to the intake valve and the exhaust valve.

[0052] S20, determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder.

[0053] In an alternative embodiment, the reciprocating compressor uses a stepless gas volume adjustment system to adjust the closing time of the intake valves of each cylinder, thereby controlling the gas volume participating in compression. The stepless gas volume adjustment system can achieve stepless adjustment of the power of the unit from 0% to 100%.

[0054] On this basis, regarding the content in S20, the embodiment of the present invention also provides an alternative embodiment. Please refer to the following. S20, the step of determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder, includes: S21, S22, S23, and S24, which are specifically described as follows.

[0055] S21, determining the closing time of the intake valve of the cylinder within the detection period according to the valve state information.

[0056] Please refer to Figure 3 , Figure 3Schematic diagram of valve state transformation provided by an embodiment of the present invention. In the figure, TDC is the top dead center on the cover side corresponding to the piston movement, that is, the piston moves to the topmost position of the cylinder head of the cylinder, and the crankshaft rotation angle corresponding to the top dead center on the cover side is 0°. BDC is the bottom dead center on the shaft side corresponding to the piston movement, that is, the piston moves to the bottom of the cylinder at the crankshaft end, and the crankshaft rotation angle corresponding to the bottom dead center on the shaft side is 180°. M1 is the exhaust valve closing time point, M2 is the intake valve opening time point, M3 is the standard intake valve closing time point without delay, M4 is the intake valve delayed closing time point, and M5 is the exhaust valve opening time point. From the start moment of the cycle (the moment when the crankshaft rotation angle is 0°, also known as the TDC moment) to M2 is the expansion stage of the cylinder, from M2 to BDC is the intake stage of the cylinder, from M3 to M5 is the compression stage of the cylinder, and from M5 to the end moment of the cycle (the moment when the crankshaft rotation angle is 360°) is the exhaust stage of the cylinder.

[0057] In the figure, t1 represents the time length from the moment when the crankshaft rotation angle is 180° (also known as the BDC moment) to M3, L1 is the piston stroke within the t1 time period, and θ1 is the crankshaft rotation angle within the t1 time period.

[0058] In the figure, t2 represents the time length from the moment when the crankshaft rotation angle is 180° (also known as the BDC moment) to M4, L2 is the piston stroke within the t2 time period, and θ2 is the crankshaft rotation angle within the t2 time period.

[0059] In the figure, t represents the time length used for a single compression and exhaust stroke, that is, the time length from the BDC moment to the TDC moment, L is the total stroke of the cylinder, and θ is the crankshaft rotation angle (180°) within the t time period.

[0060] From Figure 3 It can be seen that under normal circumstances, the stepless air volume regulation system adjusts the closing time of the intake valve of each cylinder, that is, what changes is M4, thereby controlling the air volume participating in compression and affecting the power of the cylinder. Therefore, it is necessary to execute S21 to determine the closing time of the intake valve of the cylinder within the detection period according to the valve state information.

[0061] It should be noted that when the states of the intake valve and the exhaust valve of the cylinder change, the corresponding valve state information will fluctuate violently, and the valve impact sound will be relatively significant. Therefore, by analyzing the fluctuation amplitude of the valve state information, it is possible to determine whether the states of the intake valve and the exhaust valve of the cylinder have changed, record the moments when the states of the intake valve and the exhaust valve of the cylinder change, so as to determine the exhaust valve closing time point M1, the intake valve opening time point M2, the intake valve delayed closing time point M4, and the exhaust valve opening time point M5.

[0062] As a vulnerable part in a reciprocating compressor, the air valve is numerous in quantity and has a high failure rate. The air valve is composed of parts such as a valve seat, a valve cover, a valve disc, a spring, and a nut. The opening and closing actions of the air valve are realized through the pressure difference on both sides of the valve disc of the air valve. The air valve will bear a large impact load at the moment of opening and closing. In one cycle of the reciprocating compressor operation, the intake valve and the exhaust valve open and close once each.

[0063] In an alternative embodiment, before S21, it can be determined whether the number of times the valve state information corresponding to the intake valve of the cylinder fluctuates violently within the detection period is 2, and it can be determined whether the number of times the valve state information corresponding to the exhaust valve of the cylinder fluctuates violently within the detection period is 2; if both are 2, it indicates that the opening and closing state of the air valve is normal within the detection period, and S21 can be executed; otherwise, it indicates that the air valve has a fault. Among them, violent fluctuation refers to a fluctuation with an amplitude greater than a preset amplitude.

[0064] S22. Determine the piston stroke of the cylinder during the delayed closing period according to the closing time of the intake valve of the cylinder within the detection period.

[0065] Among them, the delayed closing period is the time period from the end of cylinder suction to the closing time of the intake valve of the cylinder, or the delayed closing period is the time period from the time when the piston of the cylinder moves to the bottom dead center on the crankshaft side to the closing time of the intake valve of the cylinder.

[0066] Optionally, the step of S22 of determining the piston stroke of the cylinder during the delayed closing period according to the closing time of the intake valve of the cylinder within the detection period includes: S221 and S222, which are specifically described as follows.

[0067] S221. Determine the crankshaft rotation angle during the delayed closing period according to the closing time of the intake valve of the cylinder within the detection period.

[0068] In a reciprocating compressor, the crankshaft drives the connecting rod, and the connecting rod drives the piston in the cylinder to move. The piston stroke is related to the crankshaft rotation angle during the delayed closing period t2. Therefore, it is necessary to obtain the crankshaft rotation angle during the delayed closing period.

[0069] The key phase sensor key can collect the crankshaft rotation speed information and the crankshaft rotation angle information. The crankshaft rotation angle of the reciprocating machine during the delayed closing period t2 can be determined through the crankshaft rotation speed information during the delayed closing period t2 and the time length of the delayed closing period t2. It can also be determined by subtracting the crankshaft rotation angle corresponding to the BDC moment from the crankshaft rotation angle corresponding to the M4 moment to determine the crankshaft rotation angle during the delayed closing period.

[0070] S222. Determine the piston stroke of the cylinder during the delayed closing period according to the crankshaft rotation angle, the crankshaft crank radius, and the total stroke of the cylinder.

[0071] Optionally, the arithmetic expression for the piston stroke of the cover-side cylinder during the delayed closing period is:

[0072] ;

[0073] Wherein, represents the piston stroke, represents the crank throw radius of the crankshaft, represents the crankshaft rotation angle, represents the total stroke of the cylinder.

[0074] S23. Determine the actual power of the cylinder according to the piston stroke, the rated power of the cylinder, and the total stroke of the cylinder.

[0075] Optionally, the arithmetic expression for the actual power of the cylinder is:

[0076] ;

[0077] Wherein, represents the actual power of the cylinder, represents the rated power of the cylinder, represents the piston stroke, represents the total stroke of the cylinder.

[0078] S24. Determine the total power of the reciprocating compressor according to the actual power of each cylinder.

[0079] Optionally, take the sum of the actual powers of each cylinder as the total power of the reciprocating compressor.

[0080] At present, reciprocating compressors are all being reformed towards energy conservation. Among them, the more common applications are the unloader valve regulation system and the stepless gas volume regulation system. The stepless gas volume regulation system can achieve stepless power regulation of the unit from 0% to 100%. The stepless gas volume regulation system is applied to many units. After installing the dynamic pressure sensor, when the power of the unit changes, the actual indicator diagram of the unit will change synchronously, resulting in a large deviation between the actually displayed indicator diagram and the indicator diagram under the full-power state. If the indicator diagrams under different powers are to be used, then the theoretical indicator diagram corresponding to the actual indicator diagram and the change degree of the actual power of the unit must be obtained. Otherwise, the reference significance of various indicators calculated using the actual indicator diagram is not great. If the indicator diagrams under different powers and the various indicators calculated using the indicator diagrams are to be meaningful, it is necessary to perform working condition management and normalization processing on the calculated indicator data using the unit power at the corresponding moment, which is convenient for subsequent monitoring of the indicators.

[0081] Reciprocating machine monitoring systems often use data such as vibration, displacement, dynamic pressure, key phase, and sound to monitor equipment. However, for units with intake valve gas volume regulation, when the power changes, the actual indicator diagram will change synchronously. Without the precise time and precise pressure at the moment of intake valve closure, it is difficult to synchronously correct the theoretical indicator diagram, and the calculation of other thermodynamic indicators will also be greatly affected. Without the premise that the control signals of the DCS or gas volume control system can be externally connected, the monitoring system cannot obtain the power change of the compressor, nor can it correct the indicator diagram and calculate the corresponding indicators.

[0082] On this basis, an optional implementation manner is further provided in the embodiments of the present invention. Please refer to Figure 4 , the method for identifying the operating power of a reciprocating compressor further includes: S30, S40, and S30, which are specifically described as follows.

[0083] S30, obtain the crankshaft rotation angle information of each cylinder in the reciprocating compressor and the real-time dynamic pressure information inside the cylinder during the detection period.

[0084] S40, according to the crankshaft rotation angle information of the reciprocating machine and the real-time dynamic pressure information inside the cylinder during the detection period, draw the pressure indicator diagram of the cylinder in the actual state.

[0085] Because the area enclosed by the pressure indicator diagram (also known as the PV diagram) is directly related to the unit power, the actual PV diagram after gas volume adjustment can be drawn according to the crankshaft rotation angle information of the reciprocating machine and the real-time dynamic pressure information inside the cylinder during the detection period.

[0086] It should be noted that the theoretical pressure indicator diagram corresponding to the pressure indicator diagram in the actual state cannot be drawn. Please refer to Figure 5 , Figure 5 is the indicator diagram provided by the embodiments of the present invention. Figure 5 And Figure 3 The corresponding relationship is A: M1; B: M2; Cr: M4; Dr: M5.

[0087] In the case of no delay, the area enclosed by the pressure indicator diagram in the actual state is A - B - C - D. In the case of delay, the area enclosed by the pressure indicator diagram in the actual state is A - B - Cr - Dr. The distance from C to Cr is the piston stroke L2. In the figure, Pa1 represents the suction pressure (pressure in the intake pipe), and Pa2 represents the exhaust pressure (pressure in the exhaust pipe).

[0088] The original theoretical pressure indicator diagram (the area enclosed by A - B - C - D') in the full-power state is no longer applicable and needs to be adjusted. Therefore, S50 is executed to obtain the adjusted theoretical pressure indicator diagram (the area enclosed by A - B - Cr - Dr').

[0089] S50. Adjust the theoretical pressure indicator diagram of the cylinder according to the piston stroke.

[0090] According to the principle of stepless gas volume regulation, the intake valve delay closing time point M4 corresponds to the piston stroke position Cr, and at the same time, the real-time cylinder pressure and volume can be obtained. In this way, the theoretical indicator diagram at this power can be drawn according to the Cr position. The Cr position corresponding to the piston position and the cylinder pressure can be obtained by real-time acquisition according to the key phase and pressure data.

[0091] Optionally, the reciprocating compressor uses a unloader to adjust the intake valves of each cylinder; the unloader adjustment can only adjust the power of the unit by fully opening the intake valves. For example, if the unit has 4 intake valves and 4 exhaust valves (double-acting cylinder, 1 intake and 1 exhaust on one side), when adjusting the unit power to 50%, 2 intake valves need to be opened and these two intake valves are controlled to be always open, that is, the cylinders corresponding to these two intake valves do not do work and the inhaled gas is all discharged. For a single cylinder, the power of the single cylinder only has two states: 100% full power and 0% no-load.

[0092] In this case, regarding the content in S20, the embodiment of the present invention also provides an optional implementation manner. Please refer to the following text. S20. The step of determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder includes: S25, S26, and S27, which are specifically described as follows.

[0093] S25. Determine whether the opening time of the intake valve, the closing time of the intake valve, the opening time of the exhaust valve, and the closing time of the exhaust valve of the cylinder within the detection period are detected according to the valve state information.

[0094] It should be understood that when the intake valve of the cylinder is in the always-open state, the exhaust valve of the cylinder is in the always-closed state and there will be no state switching.

[0095] S26. In the case where all can be detected, determine that within the detection period, the cylinder is a working cylinder and the intake and exhaust valves open and close normally.

[0096] S27. Determine the total power of the reciprocating compressor according to the rated power of all working cylinders.

[0097] Optionally, determine the sum of the rated powers of all working cylinders as the total power of the reciprocating compressor.

[0098] It should be noted that the start and end points of the detection period can be determined according to the crankshaft rotation angle information collected by the key phase sensor. Determine the moment when the detected crankshaft rotation angle is 0° as the start point of the detection period, and determine the moment when the detected crankshaft rotation angle is 360° as the end point of the detection period. It should be noted that the start and end points of two adjacent detection periods coincide.

[0099] In the monitoring system of a reciprocating compressor, the vibration of the reciprocating compressor mainly consists of periodic impacts generated by components such as air valves and crossheads. Most abnormalities also manifest at the impact moments during operation. Thus, the diagnostic analysis relies strongly on accurately locating the position where the periodic impact occurs. After the key-phase sensor fails, it becomes extremely difficult to locate the impact moments of each air valve, which is highly unfavorable for data analysis. A state monitoring sensor (which can be but is not limited to a sound sensor) can be used to monitor the air valves and directly monitor the opening and closing states of each air valve. Even after the key-phase data fails, it is still possible to utilize the sequence and occurrence moments of the air valve impacts to detect the intake valve opening time, intake valve closing time, exhaust valve opening time, and exhaust valve closing time of the cylinder within the detection period, so as to precisely locate each impact in the unit and thereby simplify the waveform analysis of the reciprocating compressor.

[0100] Please refer to Figure 6 , Figure 6 which is an operating power recognition device for a reciprocating compressor provided by an embodiment of the present invention. Optionally, the operating power recognition device for the reciprocating compressor is applied to the electronic device described above.

[0101] The operating power recognition device for the reciprocating compressor includes: a first processing unit 701 and a second processing unit 702.

[0102] The first processing unit is used to obtain the valve state information of each cylinder in the reciprocating compressor within the detection period;

[0103] The second processing unit is used to determine the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder.

[0104] Optionally, the first processing unit 701 can execute the above-mentioned S10 and S30, and the second processing unit 702 can execute the above-mentioned S20, S40, and S50.

[0105] It should be noted that the operating power recognition device for the reciprocating compressor provided in this embodiment can execute the method flow shown in the above method flow embodiment to achieve the corresponding technical effects. For a brief description, for parts not mentioned in this embodiment, reference can be made to the corresponding content in the above embodiment.

[0106] An embodiment of the present invention also provides a storage medium that stores computer instructions and programs. When the computer instructions and programs are read and run, they execute the operating power recognition method for the reciprocating compressor in the above embodiment. The storage medium can include memory, flash memory, registers, or a combination thereof, etc.

[0107] The following provides an electronic device, which can be the above-mentioned acquisition station, or a mobile phone, a computer, and a server device that are communicatively connected to the acquisition station. The electronic device is as follows Figure 1 shown, and can implement the running power identification method of the reciprocating compressor described above; specifically, the electronic device includes: a processor 10, a memory 11, and a bus 12. The processor 10 can be a CPU. The memory 11 is used to store one or more programs, and when the one or more programs are executed by the processor 10, the running power identification method of the reciprocating compressor in the above-mentioned embodiments is executed.

[0108] In summary, a running power identification method, device, medium, and equipment for a reciprocating compressor provided by an embodiment of the present invention include: obtaining valve state information of each cylinder in the reciprocating compressor within a detection period; determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder. By determining the working state of each cylinder within the detection period through the valve state information and further combining it with the rated power of each cylinder, the total power of the reciprocating compressor can be accurately identified, ensuring the management accuracy of the reciprocating compressor.

[0109] The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0110] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A method for identifying the operating power of a reciprocating compressor, characterized in that: The method comprises: Obtain valve status information of each cylinder in the reciprocating compressor during a detection period; Determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder; The reciprocating compressor uses a stepless air volume regulation system to adjust the closing time of the intake valve of each cylinder; the step of determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder includes: Determine the closing time of the intake valve of the cylinder within the detection period according to the valve state information; Determine the piston stroke of the cylinder in a delayed closing period according to the closing time of the intake valve of the cylinder in the detection cycle, wherein the delayed closing period is a period from the end of the intake of the cylinder to the closing time of the intake valve of the cylinder; Determine the actual power of the cylinder according to the piston stroke, the rated power of the cylinder, and the total stroke of the cylinder; Determining the total power of the reciprocating compressor according to the actual power of each cylinder; The step of determining the piston stroke of the cylinder in the delayed closing period according to the closing time of the intake valve of the cylinder in the detection cycle comprises: determining a crankshaft rotation angle within a delayed closing period according to the closing time of the intake valve of the cylinder within the detection cycle; The piston stroke of the cylinder in the delayed closing period is determined according to the crankshaft rotation angle, the crankshaft crank radius and the total stroke of the cylinder.

2. The operating power identification method of a reciprocating compressor according to claim 1, characterized in that: The formula for the piston stroke of the cylinder during the delayed closing period is: ； in, represents the piston stroke, represents the crankshaft radius, represents the crankshaft rotation angle, Represents the total stroke of the cylinder.

3. The operating power identification method of a reciprocating compressor according to claim 1, characterized in that: The formula for the actual power of the cylinder is: ； in, represents the actual power of the cylinder, represents the rated power of the cylinder, represents the piston stroke, Represents the total stroke of the cylinder.

4. The operating power identification method of a reciprocating compressor according to claim 1, characterized in that: The method further comprises: Acquiring crankshaft rotation angle information of each cylinder in the reciprocating compressor and real-time dynamic pressure information inside the cylinder during the detection period; According to the crankshaft rotation angle information of the reciprocating machine and the real-time dynamic pressure information inside the cylinder during the detection period, a pressure indicator diagram of the cylinder in the actual state is drawn; The theoretical pressure indicator diagram of the cylinder is adjusted according to the piston stroke.

5. A device for identifying the operating power of a reciprocating compressor, characterized in that: The device comprises: A first processing unit, used to obtain valve status information of each cylinder in the reciprocating compressor within a detection period; a second processing unit, configured to determine the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder; The reciprocating compressor adopts a stepless air volume regulation system to regulate the closing time of the intake valve of each cylinder; the total power of the reciprocating compressor is determined according to the valve state information and the rated power of each cylinder, including: determining the closing time of the intake valve of the cylinder within the detection period according to the valve state information; determining the piston stroke of the cylinder within the delayed closing period according to the closing time of the intake valve of the cylinder within the detection period, wherein the delayed closing period is the time period from the end of the cylinder suction to the closing time of the intake valve of the cylinder; determining the actual power of the cylinder according to the piston stroke, the rated power of the cylinder, and the total stroke of the cylinder; determining the total power of the reciprocating compressor according to the actual power of each cylinder; The method of determining the piston stroke of the cylinder during the delayed closing period based on the closing time of the intake valve of the cylinder during the detection cycle includes: determining the crankshaft rotation angle during the delayed closing period based on the closing time of the intake valve of the cylinder during the detection cycle; and determining the piston stroke of the cylinder during the delayed closing period based on the crankshaft rotation angle, the crankshaft radius and the total stroke of the cylinder.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

7. An electronic device, characterized in that: include: A processor and a memory, the memory being used to store one or more programs; When the one or more programs are executed by the processor, the method according to any one of claims 1 to 4 is implemented.

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