Running power identification method and device of reciprocating compressor, medium and equipment

Abstract

The invention provides an operation power identification method and device of a reciprocating compressor, a medium and equipment. The operation power identification method comprises the steps that valve state information of all air cylinders in the reciprocating compressor in a detection period is obtained; and determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder. The working state of each cylinder in the detection period is determined through the valve state information, and is further combined with the rated power of each cylinder, so that the total power of the reciprocating compressor is accurately identified, and the management accuracy of the reciprocating compressor is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular 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 the piston in the cylinder to periodically change the cylinder volume and achieve gas pressurization and delivery. It is a positive displacement compressor. The crankshaft drives the connecting rod, which drives the piston to move. The working process of compressing gas can be divided into four processes: expansion, suction, compression and exhaust.

[0003] One of the management factors of a reciprocating compressor is the operating power. How to identify the operating power of a reciprocating compressor during its operation has become a difficult problem that the technical field in this field is concerned about. Summary of the invention

[0004] The object 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-mentioned problem.

[0005] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows: 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: Obtain valve status information of each cylinder in the reciprocating compressor during a detection period; The total power of the reciprocating compressor is determined according to the valve state information and the rated power of each cylinder.

[0006] In a second aspect, an embodiment of the present invention provides an operating power identification device for a reciprocating compressor, the device comprising: A first processing unit, used to obtain valve status information of each cylinder in the reciprocating compressor within a detection period; 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.

[0007] In a third aspect, an embodiment of the present invention provides a storage medium having a computer program stored thereon, and the computer program implements the above method when executed by a processor.

[0008] In a fourth aspect, an embodiment of the present invention provides an electronic device, comprising: a processor and a memory, wherein the memory is used to store one or more programs; when the one or more programs are executed by the processor, the above method is implemented.

[0009] Compared with the prior art, the embodiment of the present invention provides a method, device, medium and equipment for identifying the operating power of a reciprocating compressor, including: obtaining 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 status information and the rated power of each cylinder. The working state of each cylinder during the detection period is determined by the valve status information, and further combined with the rated power of each cylinder, so as to accurately identify the total power of the reciprocating compressor and ensure the management accuracy of the reciprocating compressor.

[0010] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0013] Figure 2 One of the flow charts of the method for identifying the operating power of a reciprocating compressor provided in an embodiment of the present invention.

[0014] Figure 3 A schematic diagram of valve state changes provided in an embodiment of the present invention.

[0015] Figure 4 The second flowchart of the method for identifying the operating power of a reciprocating compressor provided in an embodiment of the present invention.

[0016] Figure 5 This is a dynamometer diagram provided by an embodiment of the present invention.

[0017] Figure 6 A unit schematic diagram of an operating power identification device for a reciprocating compressor provided in an embodiment of the present invention.

[0018] In the figure: 10 - processor; 11 - memory; 12 - bus; 13 - communication interface; 701 - first processing unit; 702 - second processing unit. DETAILED DESCRIPTION

[0019] In order to make the purpose, 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 in conjunction with the drawings 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0021] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. 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.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0026] The power monitoring of reciprocating compressors can be carried out from the following two dimensions: first, directly using the power, intake and exhaust volume and other parameters of the DCS for monitoring; second, when the cylinder is equipped with a dynamic pressure sensor, the real-time dynamic pressure, volume changes and key phase data can be used to calculate the power of the unit. However, the data of the above two methods are difficult to access in the on-site unit monitoring, especially the installation of the dynamic pressure sensor is more complicated. In this case, the changes in the operating power of the reciprocating unit are difficult to obtain.

[0027] An embodiment of the present invention provides a monitoring system for a reciprocating compressor, the monitoring system comprising a collection station and a plurality of state monitoring sensors. At least one intake valve of each cylinder (working cylinder) of the reciprocating compressor needs to be provided with a state monitoring sensor, and at least one exhaust valve of each cylinder (working cylinder) of the reciprocating compressor needs to be provided with a state monitoring sensor.

[0028] The state monitoring sensor may be, but is not limited to, a sound sensor, a vibration sensor, an acceleration sensor, a shock pulse sensor, etc. The state monitoring sensor may be, but is not limited to, being arranged on the valve cover of the intake valve and the valve cover of the exhaust valve.

[0029] By monitoring the sound of the air valves, the impact sound of each air valve opening and closing can be clearly identified. In a single-row reciprocating compressor, even with double-acting cylinders, the transmission effect between the impact sounds of each air valve is weak, and the sound of the opening or closing of the air valve is still the main sound. The transmission of the opening and closing sounds of the other air valves to the air valve sound sensor is weak. The sound impact of the intake valve and the exhaust valve at the moment of opening is very large, and the transmission of the impact sound of the valve where the sound sensor is located and the opening and closing sounds of the other valves can be significantly distinguished. Therefore, the closing time of the intake valve monitored by the sound sensor can be used to convert the exhaust volume of the unit and synchronously correct the theoretical indicator diagram, and the power of the unit can be calculated.

[0030] The status monitoring sensors are all connected to the collection station in communication so as to transmit the acquired valve status information to the collection station.

[0031] In an optional implementation, the monitoring system further includes a key phase sensor and a dynamic pressure sensor.

[0032] The key phase sensor is a proximity switch type trigger sensor. It is installed on the transmission device between the motor and the crankshaft through the mounting bracket, such as near the flywheel. The trigger block (such as an iron block) is installed on the flywheel. The key phase sensor uses the trigger block to collect the crankshaft rotation speed information and the crankshaft rotation angle information. The key phase sensor is connected to the acquisition station in communication, and the collected crankshaft rotation speed information and crankshaft rotation angle information can be transmitted to the acquisition station.

[0033] The dynamic pressure sensor can be installed in the cylinder pressure hole or the intake valve pressure hole or the exhaust valve pressure hole through the stop valve. The dynamic pressure sensor is connected to the collection station for communication. 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 collection station.

[0034] It should be noted that the acquisition station can synchronously acquire the valve status information transmitted by the status monitoring sensor, the real-time dynamic pressure information inside the cylinder transmitted by the dynamic pressure sensor, and the crankshaft rotation angle information transmitted by the key phase sensor according to the signal synchronization acquisition cycle. The signal synchronization acquisition cycle corresponds to the crankshaft rotation speed information, that is, the duration of one crankshaft rotation is determined according to the crankshaft rotation speed information as the signal synchronization acquisition cycle.

[0035] Alternatively, when the crankshaft rotation angle information is a preset angle, the valve state information transmitted by the state monitoring sensor and the real-time dynamic pressure information inside the cylinder transmitted by the dynamic pressure sensor are synchronously collected.

[0036] 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-mentioned 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-mentioned acquisition station, or a mobile phone, computer, and server device that is connected to the acquisition station for communication. Please refer to Figure 1 , a schematic diagram of the structure of an 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 via the bus 12, and the processor 10 is used to execute an executable module stored in the memory 11, such as a computer program.

[0037] 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.

[0038] 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.

[0039] 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 .

[0040] 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.

[0041] 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.

[0042] It should be understood that Figure 1The structure shown is only a schematic diagram of a portion of the electronic device. The electronic device may also include Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown. Figure 1 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0043] The operating power identification method of a reciprocating compressor provided by the embodiment of the present invention can be applied to, but not limited to, Figure 1 For detailed procedures, please refer to the electronic equipment shown in Figure 2 , the operating power identification of the reciprocating compressor includes: S10 and S20, which are described in detail as follows.

[0044] S10, obtaining valve status information of each cylinder in the reciprocating compressor within a detection period.

[0045] The valve status information may be information monitored by status monitoring sensors disposed on the valve covers of the intake valves and the exhaust valves of the cylinders.

[0046] It should be noted that when the condition monitoring sensor adopts a sound sensor, the sound sensor can also be deployed in the vicinity of the intake valve and the exhaust valve.

[0047] S20, determining the total power of the reciprocating compressor according to the valve state information and the rated power of each cylinder.

[0048] In an optional embodiment, the reciprocating compressor uses a stepless gas volume regulation system to adjust the closing time of the intake valve of each cylinder, thereby controlling the amount of gas involved in compression. The stepless gas volume regulation system can achieve stepless power regulation of the unit from 0% to 100%.

[0049] On this basis, regarding the content in S20, the embodiment of the present invention also provides an optional implementation method, please refer to the following, S20, the step of determining the total power of the reciprocating compressor according to the valve status information and the rated power of each cylinder, includes: S21, S22, S23 and S24, which are specifically described as follows.

[0050] S21, determining the closing time of the intake valve of the cylinder within the detection cycle according to the valve state information.

[0051] Please refer to Figure 3 , Figure 3A schematic diagram of valve state transformation provided by an embodiment of the present invention. In the figure, TDC is the cover-measured top dead center 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 cover-measured top dead center is 0°, BDC is the shaft-measured bottom dead center corresponding to the piston movement, that is, the piston moves to the bottom position of the crankshaft end cylinder, and the crankshaft rotation angle corresponding to the shaft-measured bottom dead center 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 of the cycle (the moment when the crankshaft rotation angle is 0°, also called 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 of the cycle (the moment when the crankshaft rotation angle is 360°) is the exhaust stage of the cylinder.

[0052] In the figure, t1 represents the time length from the moment when the crankshaft rotation angle is 180° (also called BDC moment) to M3, L1 is the piston stroke during the t1 time period, and θ1 is the crankshaft rotation angle during the t1 time period.

[0053] In the figure, t2 represents the time length from the moment when the crankshaft rotation angle is 180° (also called BDC moment) to M4, L2 is the piston stroke during the t2 time period, and θ2 is the crankshaft rotation angle during the t2 time period.

[0054] In the figure, t represents the time length used for a single compression and exhaust stroke, that is, the time length from BDC to TDC, L is the total stroke of the cylinder, and θ is the crankshaft rotation angle (180°) during the t period of time.

[0055] from Figure 3 It can be seen that under normal circumstances, the stepless gas volume regulation system adjusts the closing time of the intake valve of each cylinder, that is, it is M4 that changes, thereby controlling the gas volume involved 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 cycle according to the valve state information.

[0056] It should be noted that when the state of the intake valve and exhaust valve of the cylinder switches, the corresponding valve state information will fluctuate violently, and the valve impact sound will be more obvious. Therefore, by analyzing the fluctuation amplitude of the valve state information, it is possible to determine whether the state of the intake valve and exhaust valve of the cylinder switches, and record the time when the state of the intake valve and exhaust valve of the cylinder switches, 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.

[0057] As a vulnerable part in a reciprocating compressor, the air valve is large in number and has a high failure rate. The air valve is composed of valve seat, valve cover, valve plate, spring, nut and other parts. The opening and closing of the air valve is achieved through the pressure difference on both sides of the valve plate. The air valve will be subjected to a large impact load at the moment of opening and closing. The inlet valve and exhaust valve are opened and closed once for each operation of the reciprocating compressor.

[0058] In an optional implementation, 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 during the detection period is 2, and whether the number of times the valve state information corresponding to the exhaust valve of the cylinder fluctuates violently during the detection period is 2; if both are 2, it means that the valve switch state is normal during the detection period, and S21 can be executed; otherwise, it means that the valve is faulty. Among them, violent fluctuation refers to fluctuation with an amplitude greater than a preset amplitude.

[0059] S22, 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.

[0060] Among them, the delayed closing period is the time period from the end of cylinder intake to the closing time of the cylinder's intake valve, or the delayed closing period is the time period from the time when the cylinder's piston moves to the axle-measured bottom dead center to the closing time of the cylinder's intake valve.

[0061] Optionally, S22, the step of 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 cycle, includes: S221 and S222, which are specifically described as follows.

[0062] S221, determining the crankshaft rotation angle within the delayed closing period according to the closing time of the intake valve of the cylinder within the detection cycle.

[0063] 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 within the delayed closing period t2, so it is necessary to obtain the crankshaft rotation angle within the delayed closing period.

[0064] The key phase sensor key can collect crankshaft rotation speed information and crankshaft rotation angle information. The crankshaft rotation angle of the reciprocating machine in the delayed closing period can be determined by the crankshaft rotation speed information in the delayed closing period t2 and the time length of the delayed closing period t2. The crankshaft rotation angle in the delayed closing period can also be determined by subtracting the crankshaft rotation angle at the BDC moment from the crankshaft rotation angle corresponding to the M4 moment.

[0065] S222: Determine the piston stroke of the cylinder during the delayed closing period according to the crankshaft rotation angle, the crankshaft radius and the total stroke of the cylinder.

[0066] Optionally, the calculation formula for the piston stroke of the cover-side cylinder during the delayed closing period is: ; in, represents the piston stroke, Indicates the crankshaft radius, represents the crankshaft rotation angle, Indicates the total stroke of the cylinder.

[0067] S23, 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.

[0068] Optionally, the actual power of the cylinder is calculated as: ; in, Indicates the actual power of the cylinder, Indicates the rated power of the cylinder, represents the piston stroke, Indicates the total stroke of the cylinder.

[0069] S24, determining the total power of the reciprocating compressor according to the actual power of each cylinder.

[0070] Optionally, the sum of the actual powers of the various cylinders is taken as the total power of the reciprocating compressor.

[0071] At present, reciprocating compressors are being transformed towards energy saving, among which the most widely used are unloading valve adjustment systems and stepless gas volume adjustment systems. The stepless gas volume adjustment system can realize stepless adjustment of the power of the unit from 0% to 100%, and the stepless gas volume adjustment system is used in many units. After the dynamic pressure sensor is installed, the actual indicator diagram of the unit will change synchronously after the power of the unit changes, resulting in a large deviation between the actual indicator diagram and the indicator diagram under full power. If the indicator diagrams under different powers are to be applied, the theoretical indicator diagram corresponding to the actual indicator diagram and the degree of change of the actual power of the unit must be obtained, otherwise the reference significance of the 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, the calculated indicator data must be managed and normalized by the unit power at the corresponding moment, so as to facilitate the subsequent monitoring of the indicators.

[0072] 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 volume regulation, when the power changes, the actual dynamometer diagram will change synchronously. Without the precise time and pressure of the intake valve closing moment, it is difficult to make synchronous corrections to the theoretical dynamometer diagram, and the calculation of other thermodynamic indicators will also be greatly affected. Under the premise that the control signal of the DCS or volume control system cannot be externally connected, the monitoring system cannot know the power change of the compressor, nor can it correct the dynamometer diagram and calculate the corresponding indicators.

[0073] On this basis, the embodiment of the present invention also provides an optional implementation method, please refer to Figure 4 , the operating power identification method of the reciprocating compressor also includes: S30, S40 and S30, which are specifically described as follows.

[0074] S30, obtaining crankshaft rotation angle information of each cylinder in the reciprocating compressor and real-time dynamic pressure information inside the cylinder during a detection period.

[0075] S40, drawing a pressure indicator diagram of the cylinder in an actual state 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.

[0076] Because the area enclosed by the pressure indicator diagram (also called PV diagram) is directly related to the unit power, the actual PV diagram after gas volume adjustment can be drawn based on the crankshaft rotation angle information of the reciprocating machine during the detection period and the real-time dynamic pressure information inside the cylinder.

[0077] It is necessary to explain that the theoretical pressure indicator diagram corresponding to the pressure indicator diagram under actual conditions cannot be drawn. Figure 5 , Figure 5 This is a dynamometer diagram provided by an embodiment of the present invention. Figure 5 and Figure 3 The corresponding relationships are A: M1; B: M2; Cr: M4; Dr: M5.

[0078] In the case of no delay, the actual pressure indicator diagram is the area enclosed by ABCD. In the case of delay, the actual pressure indicator diagram is the area enclosed by AB-Cr-Dr, and 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).

[0079] The original theoretical pressure indicator diagram (the area enclosed by ABC-D') under the full power state is no longer applicable and needs to be adjusted, so S50 is executed to obtain the adjusted theoretical pressure indicator diagram (the area enclosed by AB-Cr-Dr').

[0080] S50, adjusting the theoretical pressure indicator diagram of the cylinder according to the piston stroke.

[0081] According to the principle of stepless gas volume regulation, the delayed closing time point M4 of the intake valve corresponds to the piston stroke position Cr, and the real-time cylinder pressure and volume can be obtained at the same time, so that the theoretical indicator diagram under the power can be drawn according to the Cr position. The Cr position corresponds to the position of the piston and the pressure in the cylinder can be acquired in real time according to the key phase and pressure data.

[0082] Optionally, the reciprocating compressor uses an unloader to adjust the intake valve of each cylinder; the unloader adjustment can only adjust the power of the unit by fully opening the intake valve. For example, if the unit has 4 intake valves and 4 exhaust valves (double-acting cylinders, 1 inlet and 1 exhaust on one side), to adjust the unit power to 50%, it is necessary to open 2 intake valves and control the two intake valves to the normally open state, that is, the cylinders corresponding to the two intake valves do not work, and all the inhaled gas is discharged. For a single cylinder, the power of a single cylinder only exists in two states: 100% full power and 0% no-load.

[0083] In this case, regarding the content in S20, the embodiment of the present invention also provides an optional implementation, 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: S25, S26 and S27, which are specifically described as follows.

[0084] S25, determining whether 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 are detected according to the valve state information.

[0085] It should be understood that when the intake valve of the cylinder is in a normally open state, the exhaust valve of the cylinder is in a normally closed state, and there will be no state switching.

[0086] S26, when all can be detected, it is determined that within the detection cycle, the cylinder is a working cylinder, and the intake and exhaust valves are opened and closed normally.

[0087] S27, determining the total power of the reciprocating compressor according to the rated powers of all working cylinders.

[0088] Alternatively, the sum of the rated powers of all working cylinders is determined as the total power of the reciprocating compressor.

[0089] It should be noted that the starting point and end point of the detection cycle can be determined based on the crankshaft rotation angle information collected by the key phase sensor. The moment when the crankshaft rotation angle is detected to be 0° is determined as the starting point of the detection cycle, and the moment when the crankshaft rotation angle is detected to be 360° is determined as the end point of the detection cycle. It should be noted that the starting point and end point of two adjacent detection cycles coincide.

[0090] In the monitoring system of reciprocating compressors, the vibration of reciprocating compressors is mainly caused by periodic impacts of components such as air valves and crossheads. Most abnormalities will also appear at the impact time during operation. Therefore, the diagnostic analysis relies heavily on the accurate location of the periodic impact. After the key phase sensor fails, it is very difficult to locate the time when each air valve generates impacts, which is very unfavorable for data analysis. However, the state monitoring sensors (which can be but are not limited to sound sensors) can be used to monitor the air valves and directly monitor the opening and closing status of each air valve. Even after the key phase data fails, the order and time of the air valve impact can still be used 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 cycle to accurately locate each impact in the unit, thereby simplifying the waveform analysis of the reciprocating compressor.

[0091] See also Figure 6 , Figure 6 An operating power identification device for a reciprocating compressor is provided in an embodiment of the present invention. Optionally, the operating power identification device for a reciprocating compressor is applied to the electronic device described above.

[0092] The operating power identification device of a reciprocating compressor includes: a first processing unit 701 and a second processing unit 702 .

[0093] A first processing unit, used to obtain valve status information of each cylinder in the reciprocating compressor within a detection period; 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.

[0094] Optionally, the first processing unit 701 may execute the above-mentioned S10 and S30, and the second processing unit 702 may execute the above-mentioned S20, S40 and S50.

[0095] It should be noted that the operating power identification device for a reciprocating compressor provided in this embodiment can execute the method flow shown in the above method flow embodiment to achieve the corresponding technical effect. For the sake of brief description, for parts not mentioned in this embodiment, reference can be made to the corresponding contents in the above embodiment.

[0096] The embodiment of the present invention further provides a storage medium, which stores computer instructions and programs, and when the computer instructions and programs are read and run, the operating power identification method of the reciprocating compressor of the above embodiment is executed. The storage medium may include a memory, a flash memory, a register, or a combination thereof.

[0097] The following provides an electronic device, which may be the above-mentioned collection station, or a mobile phone, computer, or server device that is connected to the collection station for communication. Figure 1 As shown, the above-mentioned method for identifying the operating power of a reciprocating compressor can be implemented; 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. When the one or more programs are executed by the processor 10, the method for identifying the operating power of a reciprocating compressor in the above-mentioned embodiment is executed.

[0098] In summary, the embodiment of the present invention provides a method, device, medium and equipment for identifying the operating power of a reciprocating compressor, including: obtaining 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 status information and the rated power of each cylinder. The working state of each cylinder during the detection period is determined by the valve status information, and further combined with the rated power of each cylinder, so as to accurately identify the total power of the reciprocating compressor and ensure the management accuracy of the reciprocating compressor.

[0099] The above description 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 may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0100] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

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; The total power of the reciprocating compressor is determined according to the valve state information and the rated power of each cylinder.

2. The operating power identification method of a reciprocating compressor according to claim 1, characterized in that: The reciprocating compressor adopts 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 comprises: Determining 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; The total power of the reciprocating compressor is determined according to the actual power of each cylinder.

3. The operating power identification method of a reciprocating compressor according to claim 2, characterized in that: 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 the crankshaft rotation angle within the 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.

4. The operating power identification method of a reciprocating compressor according to claim 3, 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.

5. The operating power identification method of a reciprocating compressor according to claim 3, 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.

6. The operating power identification method of a reciprocating compressor according to claim 2, 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.

7. The operating power identification method of a reciprocating compressor according to claim 1, characterized in that: The reciprocating compressor uses an unloader to adjust 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 comprises: determining, according to the valve status information, whether an intake valve opening time, an intake valve closing time, an exhaust valve opening time, and an exhaust valve closing time of the cylinder within the detection period are detected; In the case where both can be detected, it is determined that the cylinder is a working cylinder during the detection cycle; The total power of the reciprocating compressor is determined according to the rated powers of all working cylinders.

8. 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; 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.

9. 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 7 is implemented.

10. 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 7 is implemented.

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