Equipment fault monitoring method and system for energy station building

Abstract

The invention relates to the technical field of energy station building monitoring, in particular to an equipment fault monitoring method and system for an energy station building, and the method comprises the steps: obtaining the operation monitoring data of a screw type water chilling unit in the energy station building, and setting a sliding valve hot gear power-on event and a sliding valve cold gear power-on event according to the operation monitoring data based on the sliding valve stability condition; generating a hot gear power-on stroke rate according to the slide valve hot gear power-on event, and generating a cold gear power-on stroke rate according to the slide valve cold gear power-on event; counting the number of abnormal stroke rates when the hot-gear power-on stroke rate is smaller than or equal to the cold-gear power-on stroke rate; and judging whether the abnormal times of the stroke rate are greater than or equal to an abnormal times threshold, and if so, generating a slide valve fault alarm. The problems that in the prior art, production is affected and consumed time is long due to the fact that fault monitoring is carried out after the compressor is shut down and disassembled can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy station house monitoring, in particular to an energy station house equipment fault monitoring method and system. BACKGROUND

[0002] The screw water chiller is the core equipment in the energy station house. In order to ensure the normal operation of the screw water chiller, the key condition components of the screw water chiller are usually monitored, and the operation of the slide valve is more important.

[0003] The state monitoring of the slide valve in the prior art is mainly performed by stopping, disassembling and mechanically measuring. Generally, professional maintenance personnel disassemble the end cover to completely expose the slide valve after the compressor is stopped, and manually measure using tools such as a feeler gauge and a dial gauge. However, this method needs to be detected in a stopped state, which is prone to cause production interruption due to stopping, resulting in economic losses. The disassembly process takes a long time and is also prone to damage other equipment, introducing new fault problems. The results of manual disassembly detection are based on manual experience, which is prone to misjudgment.

[0004] Therefore, it is urgent to design an energy station house equipment fault monitoring method and system to solve the problems in the prior art. SUMMARY

[0005] Therefore, it is urgent to design an energy station house equipment fault monitoring method and system to solve the problems in the prior art.

[0006] The technical scheme of the present application is as follows: An energy station house equipment fault monitoring method, the method comprising: Obtaining operation monitoring data of a screw water chiller in an energy station house, and setting a slide valve hot stroke power-on event and a slide valve cold stroke power-on event based on a slide valve stable condition according to the operation monitoring data; Generating a hot stroke power-on stroke rate according to the slide valve hot stroke power-on event, and generating a cold stroke power-on stroke rate according to the slide valve cold stroke power-on event; Counting the number of stroke rate abnormalities when the hot stroke power-on stroke rate is less than or equal to the cold stroke power-on stroke rate; Judging whether the number of stroke rate abnormalities is greater than or equal to an abnormality threshold, and generating a slide valve fault alarm if the judgment is yes.

[0007] Optionally, setting a slide valve hot stroke power-on event and a slide valve cold stroke power-on event based on a slide valve stable condition according to the operation monitoring data comprises: extracting, from the operation monitoring data, slide valve stable operation data of the slide valve based on a slide valve stable condition, wherein the slide valve stable condition is that a pressure difference between an oil pump outlet and an oil return is greater than or equal to a minimum required pressure, and filter differential pressures of a main oil filter and a control oil branch filter are both less than or equal to a preset upper limit of differential pressure; setting, based on an operation grading condition, a slide valve hot grade energization event and a slide valve cold grade energization event according to the slide valve stable operation data.

[0008] Optionally, the operation grading condition includes a minimum continuous energization time, a safe stroke range, and a minimum movement length. Setting, based on an operation grading condition, a slide valve hot grade energization event and a slide valve cold grade energization event according to the slide valve stable operation data includes: extracting, from the slide valve stable operation data, continuous energization events of the slide valve, and corresponding starting oil temperatures, slide valve movement positions, actual energization durations, and slide valve movement lengths of the continuous energization events; setting, as alternative energization events, continuous energization events in which the actual energization duration is greater than or equal to the minimum continuous energization time, the slide valve movement position is within the safe stroke range, and the slide valve movement length is greater than or equal to the minimum movement length. Setting a slide valve hot grade energization event and a slide valve cold grade energization event according to the alternative energization events.

[0009] Optionally, the operation grading condition further includes a cold grade boundary temperature, a hot grade boundary temperature, and a boundary temperature margin. Setting a slide valve hot grade energization event and a slide valve cold grade energization event according to the alternative energization events includes: setting, as a slide valve cold grade energization event, an alternative energization event corresponding to a starting oil temperature less than or equal to a cold grade setting temperature, wherein the cold grade setting temperature is a value obtained by subtracting the boundary temperature margin from the cold grade boundary temperature. setting, as a slide valve hot grade energization event, an alternative energization event corresponding to a starting oil temperature greater than or equal to a hot grade setting temperature, wherein the hot grade setting temperature is a value obtained by adding the boundary temperature margin to the hot grade boundary temperature.

[0010] Optionally, the slide valve hot grade energization event includes a loading direction hot grade event and an unloading direction hot grade event. The hot grade energization stroke rate includes a hot grade loading stroke rate and a hot grade unloading stroke rate. Generating a hot grade energization stroke rate according to the slide valve hot grade energization event includes: Generating a hot grade loading unit stroke rate and a hot grade unloading unit stroke rate according to slide valve displacement increments and actual energization durations corresponding to the loading direction hot grade event and the unloading direction hot grade event, respectively. Calculate the median of each of the hot file loading unit stroke rates to generate a hot file loading stroke rate; Calculate the median of each of the hot file unloading unit stroke rates to generate a hot file unloading stroke rate.

[0011] Optionally, the cold file energization event of the spool valve includes a loading direction cold file event and an unloading direction cold file event; The cold file energization stroke rate includes a cold file loading stroke rate and a cold file unloading stroke rate; Generating a cold file energization stroke rate according to the cold file energization event of the spool valve includes: Generating a cold file loading unit stroke rate and a cold file unloading unit stroke rate according to the corresponding spool valve displacement increment and actual energization time length of the loading direction cold file event and the unloading direction cold file event, respectively; Calculate the median of each of the cold file loading unit stroke rates to generate a cold file loading stroke rate; Calculate the median of each of the cold file unloading unit stroke rates to generate a cold file unloading stroke rate.

[0012] Optionally, the method further includes: Counting the number of times that the hot file loading stroke rate is less than or equal to the cold file loading stroke rate, denoted as a loading abnormality number; Counting the number of times that the hot file unloading stroke rate is less than or equal to the cold file unloading stroke rate, denoted as an unloading abnormality number; Adding the loading abnormality number and the unloading abnormality number to obtain a stroke rate abnormality number.

[0013] Optionally, the method further includes: Generating a symmetry index according to the hot file loading stroke rate and the hot file unloading stroke rate; Determining whether the spool valve is asymmetric according to the symmetry index; If the determination is yes, generating a spool valve asymmetry alarm; if the determination is no, generating a normal symmetry.

[0014] Optionally, determining whether the spool valve is asymmetric according to the symmetry index includes: Determining whether the symmetry index is greater than or equal to a symmetry threshold value; If the determination is no, determining that the spool valve is symmetric; if the determination is yes, determining that the spool valve is asymmetric.

[0015] Optionally, an equipment fault monitoring system of an energy station house is also provided, and the system includes: The energization event screening module is configured to acquire operation monitoring data of a screw water chiller in an energy station house, and set a hot valve energization event and a cold valve energization event according to the operation monitoring data based on a valve stability condition. The energization stroke generation module is configured to generate a hot energization stroke rate according to the hot valve energization event, and generate a cold energization stroke rate according to the cold valve energization event. The abnormal number generation module is configured to count a stroke rate abnormal number of the hot energization stroke rate being less than or equal to the cold energization stroke rate. The fault alarm judgment module is configured to judge whether the stroke rate abnormal number is greater than or equal to an abnormal number threshold, and generate a valve fault alarm if the judgment is yes.

[0016] Optionally, the energization event screening module is further configured to extract valve stability operation data of a valve from the operation monitoring data based on a valve stability condition, where the valve stability condition is that a pressure difference between an oil pump outlet and an oil return is greater than or equal to a minimum required pressure, and filter differential pressures of a main oil filter and a control oil branch filter are both less than a preset differential pressure upper limit; and set a hot valve energization event and a cold valve energization event according to the valve stability operation data based on an operation grading condition.

[0017] Optionally, the operation grading condition includes a minimum continuous energization time, a safe stroke range, and a minimum movement length; the energization event screening module is further configured to extract continuous energization events of a valve, and starting oil temperatures, valve movement positions, actual energization durations, and valve movement lengths corresponding to the continuous energization events from the valve stability operation data; set a continuous energization event, in which the actual energization duration is greater than or equal to the minimum continuous energization time, the valve movement position is within the safe stroke range, and the valve movement length is greater than or equal to the minimum movement length, as a candidate energization event; and set a hot valve energization event and a cold valve energization event according to the candidate energization event.

[0018] Optionally, the operation grading condition further includes a cold grade boundary temperature, a hot grade boundary temperature, and a boundary temperature margin; the energization event screening module is further configured to set a candidate energization event corresponding to a starting oil temperature less than or equal to a cold grade set temperature as a cold valve energization event, where the cold grade set temperature is a value obtained by subtracting the boundary temperature margin from the cold grade boundary temperature; and set a candidate energization event corresponding to a starting oil temperature greater than or equal to a hot grade set temperature as a hot valve energization event, where the hot grade set temperature is a value obtained by adding the boundary temperature margin to the hot grade boundary temperature.

[0019] Optionally, the slide valve hot stroke energizing event includes a loading direction hot stroke event and an unloading direction hot stroke event; the hot stroke energizing stroke rate includes a hot stroke loading stroke rate and a hot stroke unloading stroke rate; the energizing stroke generating module is further configured to: generate a hot stroke loading unit stroke rate and a hot stroke unloading unit stroke rate respectively according to the slide valve displacement increment and the actual energizing time length corresponding to the loading direction hot stroke event and the unloading direction hot stroke event; calculate the median of each hot stroke loading unit stroke rate to generate a hot stroke loading stroke rate; and calculate the median of each hot stroke unloading unit stroke rate to generate a hot stroke unloading stroke rate.

[0020] Optionally, the slide valve cold stroke energizing event includes a loading direction cold stroke event and an unloading direction cold stroke event; the cold stroke energizing stroke rate includes a cold stroke loading stroke rate and a cold stroke unloading stroke rate; the energizing stroke generating module is further configured to: generate a cold stroke loading unit stroke rate and a cold stroke unloading unit stroke rate respectively according to the slide valve displacement increment and the actual energizing time length corresponding to the loading direction cold stroke event and the unloading direction cold stroke event; calculate the median of each cold stroke loading unit stroke rate to generate a cold stroke loading stroke rate; and calculate the median of each cold stroke unloading unit stroke rate to generate a cold stroke unloading stroke rate.

[0021] Optionally, the abnormality number generating module is further configured to: count the number of times that the hot stroke loading stroke rate is less than or equal to the cold stroke loading stroke rate, denoted as a loading abnormality number; count the number of times that the hot stroke unloading stroke rate is less than or equal to the cold stroke unloading stroke rate, denoted as an unloading abnormality number; and add the loading abnormality number and the unloading abnormality number to obtain a stroke rate abnormality number.

[0022] Optionally, the fault alarm judging module is further configured to: generate a symmetry index according to the hot stroke loading stroke rate and the hot stroke unloading stroke rate; judge whether the slide valve is asymmetric according to the symmetry index; if the judgment is yes, generate a slide valve asymmetry alarm; and if the judgment is no, generate a symmetry normality.

[0023] Optionally, the fault alarm judging module is further configured to: judge whether the symmetry index is greater than or equal to a symmetry threshold value; if the judgment is no, judge that the slide valve is symmetric; and if the judgment is yes, judge that the slide valve is asymmetric.

[0024] Optionally, a computer device is further provided, including a memory and a processor, the memory stores a computer program, and the processor implements the steps of the energy station building device fault monitoring method when executing the computer program.

[0025] Optionally, a computer readable storage medium is further provided, which stores a computer program, and the computer program is executed by a processor to implement the steps of the energy station building device fault monitoring method.

[0026] The technical effects achieved by this invention are as follows: The aforementioned equipment fault monitoring method and system for energy stations acquires operational monitoring data of the screw chiller units in the energy station. Based on the stability conditions of the sliding valve, it sets hot-side energizing events and cold-side energizing events of the sliding valve according to the operational monitoring data. It generates a hot-side energizing stroke rate based on the hot-side energizing events and a cold-side energizing stroke rate based on the cold-side energizing events. It counts the number of stroke rate anomalies where the hot-side energizing stroke rate is less than or equal to the cold-side energizing stroke rate. It then determines whether the number of stroke rate anomalies is greater than or equal to an anomaly threshold. If the determination is yes, a sliding valve fault alarm is generated. This application addresses the problem of long processing times and production disruptions caused by fault monitoring in existing technologies, which relies on compressor shutdown and disassembly, by directly analyzing operational monitoring data from screw chiller units in energy stations. It utilizes stable conditions for slide valve operation to filter data, enabling the setting of hot-side and cold-side energizing events based on the operational monitoring data under stable conditions, thus avoiding inaccurate data monitoring due to instability. By filtering these events, fault diagnosis is performed based on temperature grading. Next, a hot-side energizing stroke rate is generated based on the hot-side energizing event, and a cold-side energizing stroke rate is generated based on the cold-side energizing event. The number of stroke rate anomalies where the hot-side energizing stroke rate is less than or equal to the cold-side energizing stroke rate is counted. The number of these anomalies is then determined to be greater than or equal to an anomaly threshold. If the threshold is met, a slide valve fault alarm is generated; otherwise, a normal slide valve indication is generated. The hot-side energizing event of the spool valve refers to the energizing event when the initial oil temperature in the oil circuit is at the hot side, and the cold-side energizing event refers to the energizing event when the initial oil temperature is at the cold side. The initial oil temperature corresponding to the hot side is greater than that corresponding to the cold side. Under normal circumstances, in the hot side, the temperature is high and the viscosity of the lubricating oil is low. When the solenoid valve is activated, the piston will respond more quickly under the drive of the lubricating oil. In the cold side, the temperature is low and the viscosity of the lubricating oil is high. When the solenoid valve is activated, the piston's response under the drive of the lubricating oil will be slower than that in the hot side. That is, under the normal operating condition of the spool valve, the stroke rate of the hot side energizing event should be greater than that of the cold side energizing event. If the hot-side energizing stroke rate is less than or equal to the cold-side energizing stroke rate in a single instance, the error may be due to minor temperature drift, end position influence, sampling jitter, or other issues. However, if this occurs multiple times, the probability of a fault is relatively high. Therefore, this application counts the number of stroke rate anomalies where the hot-side energizing stroke rate is less than or equal to the cold-side energizing stroke rate, and determines whether to generate a slide valve fault alarm based on the number of stroke rate anomalies. This eliminates the need for machine shutdown and disassembly for inspection, greatly improving the convenience of detection. Attached Figure Description

[0027] Figure 1 FIG. 1 is a flowchart illustrating a method for monitoring equipment faults of an energy station house according to an embodiment of the present disclosure; Figure 2 FIG. 2 is a block diagram illustrating a system for monitoring equipment faults of an energy station house according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular sequences of acts, techniques, etc., in order to provide a thorough understanding of the embodiments of the present disclosure. However, it will be apparent to those skilled in the art that the present embodiments can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, and circuits are omitted so as not to obscure the description of the present embodiments.

[0029] It is to be understood that the terminology "includes", "has", "holds", "contains" and / or "comprising", when used in this specification and in the following claims, indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0030] It is also to be understood that the terminology "and / or" when used in this specification and in the following claims, refers to at least one of the items, or any combination of the items, and includes all possible combinations when used in the following claims.

[0031] As used in this specification and in the claims, the terms "if" and "when" can be interpreted to mean "upon" or "in response to determining," or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining," or "upon detecting [the described condition or event]" or "in response to detecting [the described condition or event]," depending on the context.

[0032] In addition, in the description of the specification and the appended claims, the terms "first", "second", "third", etc. are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0033] Reference within the specification to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase "in one embodiment" or "in some embodiments" in various places within specified

[0034] In one embodiment, a terminal is provided, configured to: acquire operation monitoring data of a screw water chiller in an energy station house, set a hot stroke power-on event and a cold stroke power-on event of a slide valve based on a slide valve stable condition according to the operation monitoring data; generate a hot stroke power-on stroke rate according to the hot stroke power-on event and a cold stroke power-on stroke rate according to the cold stroke power-on event; count an abnormal stroke rate number of the hot stroke power-on stroke rate being less than or equal to the cold stroke power-on stroke rate; determine whether the abnormal stroke rate number is greater than or equal to an abnormal number threshold, and if yes, generate a slide valve fault alarm.

[0035] The terminal can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers and portable wearable devices.

[0036] In one embodiment, as shown in Figure 1 An energy station house equipment fault monitoring method is provided, including: Step S100: acquiring operation monitoring data of a screw water chiller in an energy station house, setting a hot stroke power-on event and a cold stroke power-on event of a slide valve based on a slide valve stable condition according to the operation monitoring data; Step S200: generating a hot stroke power-on stroke rate according to the hot stroke power-on event and a cold stroke power-on stroke rate according to the cold stroke power-on event; Step S300: counting an abnormal stroke rate number of the hot stroke power-on stroke rate being less than or equal to the cold stroke power-on stroke rate; Step S400: determining whether the abnormal stroke rate number is greater than or equal to an abnormal number threshold, and if yes, generating a slide valve fault alarm.

[0037] In this embodiment, by obtaining the operation monitoring data of the screw water chiller in the energy station house, the running monitoring data during operation is directly analyzed to solve the problem of affecting production and long time consumption caused by fault monitoring after the compressor is stopped and disassembled in the prior art; by setting the slide valve stable condition for data screening, the slide valve hot range power-on event and the slide valve cold range power-on event are set according to the running monitoring data in the stable state to avoid the problem of inaccurate data monitoring caused by unstable conditions; by screening the slide valve hot range power-on event and the slide valve cold range power-on event, fault judgment is realized after temperature-based grading; then, the hot range power-on stroke rate is generated according to the slide valve hot range power-on event, the cold range power-on stroke rate is generated according to the slide valve cold range power-on event, and the stroke rate abnormality times when the hot range power-on stroke rate is less than or equal to the cold range power-on stroke rate are counted, whether the stroke rate abnormality times is greater than or equal to the abnormality times threshold is judged, if the judgment is yes, the slide valve fault alarm is generated, and if the judgment is no, the slide valve normal indication is generated. The slide valve hot range power-on event is the power-on event when the initial oil temperature in the oil circuit is in the hot range, the slide valve cold range power-on event is the power-on event when the initial oil temperature is in the cold range, and the initial oil temperature corresponding to the hot range is greater than the initial oil temperature corresponding to the cold range. Under normal circumstances, when the hot range, the temperature is high, the viscosity of the lubricating oil is low, and when the electromagnetic valve acts, the piston will have a faster response under the drive of the lubricating oil; when the cold range, the temperature is low, the viscosity of the lubricating oil is high, and when the electromagnetic valve acts, the response of the piston under the drive of the lubricating oil will be slower than that when the hot range, that is, under the normal working state of the slide valve, the hot range power-on stroke rate should be greater than the cold range power-on stroke rate. If the hot range power-on stroke rate is less than or equal to the cold range power-on stroke rate occurs, it may be caused by errors such as slight temperature drift, end position influence, sampling jitter, etc.; but if it occurs multiple times, there is a high probability of failure, and then, the present application counts the stroke rate abnormality times when the hot range power-on stroke rate is less than or equal to the cold range power-on stroke rate, and judges whether to generate a slide valve fault alarm based on the stroke rate abnormality times, without stopping and disassembling for inspection, greatly improving the detection convenience.

[0038] In one embodiment, in step S100, the slide valve hot range power-on event and the slide valve cold range power-on event are set based on the running monitoring data according to the slide valve stable condition, which includes: Step S110: slide valve stable operation data of the slide valve is extracted from the running monitoring data based on the slide valve stable condition, wherein the slide valve stable condition is that the pressure difference between the oil pump outlet and the oil return is greater than or equal to the minimum required pressure, and the filter differential pressure of the main oil filter and the control oil branch filter is not more than the preset differential pressure upper limit; Step S120: based on the running grading condition, the slide valve hot range power-on event and the slide valve cold range power-on event are set according to the slide valve stable operation data.

[0039] In this embodiment, in step S110, in order to exclude the problem that the response becomes slow due to insufficient driving force of the hydraulic cylinder, and further affects the fault monitoring judgment result, the pressure difference between the oil pump outlet and the oil return in the slide valve stable condition is set to be greater than or equal to the minimum required pressure. The minimum required pressure is the minimum driving pressure required for the hydraulic cylinder to overcome static friction, seal pre-tightening and pipeline pressure loss. The minimum required pressure is generally set to 0.5 MPa to 1 MPa, and the recommended value set by the equipment manufacturer is usually used or is increased by 10%-20% based on the recommended value.

[0040] The filter differential pressure of the main oil filter is the pressure difference before and after the main oil filter, denoted as the first pressure difference; the filter differential pressure of the control oil branch filter is the pressure difference before and after the control oil branch filter, denoted as the second pressure difference. The preset differential pressure upper limit includes the first pressure difference upper limit corresponding to the main oil filter and the second pressure difference upper limit corresponding to the control oil branch filter. The first pressure difference is less than or equal to the first pressure difference upper limit. The second pressure difference is less than or equal to the second pressure difference upper limit. If the filter element is blocked, causing the differential pressure to rise, it is easy to misjudge the problem of limited oil supply or the problem of limited oil supply as mechanical sticking of the slide valve, therefore, by setting the filter differential pressure of the control oil branch filter to not exceed the preset differential pressure upper limit, the interference of the filter on the slide valve monitoring result is filtered out. The first pressure difference upper limit is set according to the filter element nameplate, and the second pressure difference upper limit is set according to the valve body specification. For example, the first pressure difference upper limit is commonly set to 0.2 MPa to 0.3 MPa, such as 0.25 MPa. The second pressure difference upper limit is commonly set to 0.05 MPa to 0.10 MPa, such as 0.08 MPa.

[0041] Based on the setting of the slide valve stable condition, the subsequent slide valve fault judgment is performed under the condition of sufficient oil supply and sufficient driving force, the slide valve fault false alarm caused by oil supply and driving force is filtered out, and the accuracy of the subsequent slide valve fault monitoring result is improved.

[0042] Furthermore, the number of stable operating data points for the spool valve is multiple, with each stable operating data point corresponding to a stable time period for the spool valve. That is, when a time point meeting the spool valve stability condition is detected, data extraction begins. The extracted data serves as the stable operating data for the spool valve, while simultaneously determining in real-time whether the spool valve stability condition is met. When the duration of the extraction does not meet the spool valve stability condition for a preset time period, data extraction ends. The time period from the start to the end of data extraction is the stable time period for the spool valve. The preset time period is pre-set, such as 25 seconds, 50 seconds, etc. The preset time period can be set by those skilled in the art based on the shortest continuous power-on time, such as at least 10 times the shortest continuous power-on time. If the shortest continuous power-on time is 2 seconds, then the preset time period can be set to at least 20 seconds.

[0043] One stable time period of the spool valve corresponds to multiple spool valve hot-side energizing events and spool valve cold-side energizing events. That is, within the branch time of the stable time period of the spool valve, some branch time corresponds to spool valve hot-side energizing events, and other branch time corresponds to spool valve cold-side energizing events. Other energizing events that do not meet the operating segmentation conditions are excluded and do not participate in subsequent fault judgment.

[0044] In step S120, by setting the operating segmentation conditions, the hot segment energizing event and the cold segment energizing event of the slide valve are set according to the stable operation data of the slide valve, so as to realize the refined classification of the cold segment and the hot segment.

[0045] In one embodiment, the operating grading conditions include the shortest continuous power-on time, the safe travel range, and the shortest travel length; Step S120: Based on the operating range conditions, set the hot-range energizing event and the cold-range energizing event of the slide valve according to the stable operating data of the slide valve, including: Step S121: Extract the continuous energizing events of the spool valve from the stable operation data of the spool valve, as well as the starting oil temperature, spool valve moving position, actual energizing duration and spool valve moving length corresponding to the continuous energizing events; Step S122: Set the continuous energizing events in which the actual energizing duration is greater than or equal to the shortest continuous energizing time, the sliding valve movement position is within the safe travel range, and the sliding valve movement length is greater than or equal to the shortest movement length as candidate energizing events; Step S123: Set the hot-side energizing event and the cold-side energizing event of the slide valve according to the alternative energizing events.

[0046] In this embodiment, when the capacity of the screw water chiller is adjusted, the structure of the slide valve, hydraulic cylinder and loading or unloading solenoid valve is adopted. The continuous energization event refers to the time period during which the slide valve solenoid valve is continuously energized in the natural running state of the screw water chiller, and the event of displacement of the slide valve during the time period.

[0047] The purpose of setting the minimum continuous energization time is to inhibit the unstable state caused by switching of the hydraulic cylinder. By setting the minimum continuous energization time, it is possible to cross the unstable state and avoid inaccurate monitoring results caused by instability. The minimum continuous energization time is generally set to 1-2 seconds, and preferably 1.5 seconds.

[0048] The safe stroke range refers to 2%FS-98%FS, and FS refers to the rated full stroke of the slide valve. The purpose of setting the safe stroke range is to avoid the influence of end effects such as end buffering and speed limiting on fault monitoring.

[0049] The setting of the minimum movement length is related to the rated full stroke of the slide valve, and is generally set to at least 1%FS-2%FS, such as 1.5%FS. If the movement length of the slide valve is too small, it is easy to cause a large error in the subsequent calculation of the energized stroke rate, and therefore it is necessary to set the minimum movement length to filter out the control events in which the slide valve hardly moves.

[0050] In step S121, the starting oil temperature corresponding to the continuous energization event refers to the temperature of the lubricating oil in the oil circuit system when the energization is started. The slide valve movement position refers to the position moved by the slide valve during the entire process of the continuous energization event. The actual energization duration refers to the duration of the entire continuous energization event. The slide valve movement length refers to the difference between the starting position and the end position of the slide valve during the entire process of the continuous energization event. For example, the time corresponding to the continuous energization event is t0-t1, and the positions corresponding to t0 and t1 are x0 and x1, respectively, and the slide valve movement length is the absolute value of the difference between x0 and x1.

[0051] Further, in step S122, the continuous energization event in which the actual energization duration is greater than or equal to the minimum continuous energization time, the slide valve movement position is within the safe stroke range, and the slide valve movement length is greater than or equal to the minimum movement length is set as an alternative energization event, thereby facilitating better screening of the slide valve hot energization event and the slide valve cold energization event in subsequent step S123. Wherein, the slide valve movement position within the safe stroke range refers to that the movement position of the slide valve is always within the safe stroke range.

[0052] In one embodiment, the running division condition further includes a cold division boundary temperature, a hot division boundary temperature and a boundary temperature margin. Step S123: setting the slide valve hot range energizing event and the slide valve cold range energizing event according to the alternative energizing event, comprising: Step S1231: setting the alternative energizing event corresponding to the starting oil temperature less than or equal to the cold range set temperature as the slide valve cold range energizing event, wherein the cold range set temperature is the value of the cold range boundary temperature minus the boundary temperature margin; Step S1232: setting the alternative energizing event corresponding to the starting oil temperature greater than or equal to the hot range set temperature as the slide valve hot range energizing event, wherein the hot range set temperature is the value of the hot range boundary temperature plus the boundary temperature margin.

[0053] In the embodiment, the cold range boundary temperature, the hot range boundary temperature and the boundary temperature margin are pre-set. The cold range boundary temperature and the hot range boundary temperature are set to have sufficient difference in oil viscosity when the cold range and the hot range are divided, so as to facilitate subsequent fault judgment based on the principle that the response speed in the hot range should be greater than that in the cold range. Therefore, the temperature difference of the cold range boundary temperature and the hot range boundary temperature should have a certain temperature difference, preferably 12-16℃, for example, 15℃.

[0054] The boundary temperature margin is a safety distance reserved based on the cold range boundary temperature and the hot range boundary temperature, and is used to avoid misclassification caused by boundary jitter. For example, if the boundary temperature margin is not set, and the cold range boundary temperature is 40℃, the starting oil temperature less than or equal to 40℃ is classified as the cold range. However, in actual work, the starting oil temperature often fluctuates slightly near the boundary, for example, T0 is 39.9℃, which is classified as the cold range; T1 is 40.1℃, which is not classified as the cold range; T2 is 39.8℃, which is classified as the cold range. This causes the adjacent events to fall into the cold range and not the cold range, which leads to the number of cold range samples changing with the starting fluctuation, which is not conducive to data statistics and subsequent fault monitoring. If the boundary temperature margin is set, for example, the boundary temperature margin is 1℃, then only less than or equal to 39℃ is classified as the cold range, which filters out the unreliable samples corresponding to the fluctuation of the original starting temperature 40℃, thereby achieving the effect of avoiding boundary jitter.

[0055] In order to prevent the temperature measurement noise from causing the step change when the boundary temperature jumps, the boundary temperature margin is set, the cold range set temperature is obtained by subtracting the boundary temperature margin from the cold range boundary temperature, the hot range set temperature is obtained by adding the boundary temperature margin to the hot range boundary temperature, the cold range energization event of the slide valve is set only when the initial oil temperature is less than or equal to the cold range set temperature, the hot range energization event of the slide valve is set only when the initial oil temperature is greater than or equal to the hot range set temperature, and the rest of the samples are directly excluded and do not participate in the statistics and subsequent fault monitoring judgment.

[0056] In one embodiment, the cold range boundary temperature is set to about 40 DEG C, and the hot range boundary temperature is set to about 55 DEG C.

[0057] In one embodiment, the hot range energization event of the slide valve includes a hot range event in the loading direction and a hot range event in the unloading direction. The hot range energization stroke rate includes a hot range loading stroke rate and a hot range unloading stroke rate. In step S200, the hot range energization stroke rate is generated according to the hot range energization event of the slide valve, including: In step S211, the hot range loading unit stroke rate and the hot range unloading unit stroke rate are respectively generated according to the slide valve displacement increment and the actual energization time length corresponding to the hot range event in the loading direction and the hot range event in the unloading direction. In step S212, the median of each hot range loading unit stroke rate is calculated to generate the hot range loading stroke rate. In step S213, the median of each hot range unloading unit stroke rate is calculated to generate the hot range unloading stroke rate.

[0058] In this embodiment, the hot range event in the loading direction refers to the energization event in which the control system increases the compressor displacement and the hydraulic drive moves the slide valve towards the full load end. The hot range unloading stroke rate refers to the energization event in which the slide valve moves towards the direction of reducing the compressor displacement.

[0059] In step S211, the hot range loading unit stroke rate is generated based on the following formula: wherein, is the hot range loading unit stroke rate, is the slide valve displacement increment corresponding to the hot range event in the loading direction; is the actual energization duration corresponding to the hot-filing event in the loading direction. For example, the slide valve displacement increment is the value of x1 minus x0, the units of x0 and x1 being %FS, where FS represents the rated full stroke of the slide valve, in the time corresponding to the continuous energization event, t0-t1, x0 and x1 corresponding to positions t0 and t1 respectively.

[0060] The hot-filing unloading unit stroke rate adopts the same formula as the hot-filing loading unit stroke rate, and those skilled in the art should know how to calculate it, and this application will not be repeated.

[0061] In steps S212 to S213, the median of each hot-filing loading unit stroke rate is set as the hot-filing loading stroke rate, and the median of each hot-filing unloading unit stroke rate is set as the hot-filing unloading stroke rate, to facilitate subsequent comparison of hot and cold files based on loading and unloading.

[0062] In one embodiment, the slide valve cold-filing energization event includes a cold-filing event in the loading direction and a cold-filing event in the unloading direction; The cold-filing energization stroke rate includes a cold-filing loading stroke rate and a cold-filing unloading stroke rate; In step S200, the cold-filing energization stroke rate is generated according to the slide valve cold-filing energization event, including: Step S221: According to the slide valve displacement increment and the actual energization duration corresponding to the loading direction cold-filing event and the unloading direction cold-filing event, respectively generate a cold-filing loading unit stroke rate and a cold-filing unloading unit stroke rate; Step S222: Calculate the median of each cold-filing loading unit stroke rate to generate a cold-filing loading stroke rate; Step S223: Calculate the median of each cold-filing unloading unit stroke rate to generate a cold-filing unloading stroke rate.

[0063] In this embodiment, the cold-filing loading stroke rate and the cold-filing unloading stroke rate adopt the same formula as the generation of the hot-filing loading unit stroke rate described above, and this application will not be repeated.

[0064] Similarly, by calculating the median of each cold-filing loading unit stroke rate to generate a cold-filing loading stroke rate, and calculating the median of each cold-filing unloading unit stroke rate to generate a cold-filing unloading stroke rate, it is convenient for subsequent comparison of hot and cold files based on unloading and loading.

[0065] In one embodiment, step S300: Count the number of stroke rate abnormalities in which the hot-filing energization stroke rate is less than or equal to the cold-filing energization stroke rate, including: Step S310: Count the number of times the hot-filing loading stroke rate is less than or equal to the cold-filing loading stroke rate, recorded as the loading abnormality number; Step S320: Count the number of times that the hot-temperature unloading stroke rate is less than or equal to the cold-temperature unloading stroke rate, and record the number of times as an unloading abnormality number. Step S330: Add the loading abnormality number and the unloading abnormality number to obtain a stroke rate abnormality number.

[0066] In this embodiment, the hot-temperature loading stroke rate is compared with the cold-temperature loading stroke rate, and the number of times that the hot-temperature loading stroke rate is less than or equal to the cold-temperature loading stroke rate is counted, and the number of times is recorded as a loading abnormality number.

[0067] The hot-temperature unloading stroke rate is compared with the cold-temperature unloading stroke rate, and the number of times that the hot-temperature unloading stroke rate is less than or equal to the cold-temperature unloading stroke rate is counted, and the number of times is recorded as an unloading abnormality number. Finally, the loading abnormality number and the unloading abnormality number are added to obtain a stroke rate abnormality number. The greater the stroke rate abnormality number is, the greater the probability of mechanical jamming failure of the spool is, and the more the pre-warning is needed.

[0068] In one embodiment, in step S400, if the stroke rate abnormality number is greater than or equal to an abnormality number threshold, if the judgment is yes, a spool failure warning is generated. At the same time that the spool failure warning is generated, a first warning report is also generated. The first warning report includes a spool mechanical jamming pre-warning caused by dry friction or jamming. Through the first warning report, subsequent maintenance personnel can carry out targeted maintenance, and the time cost of maintenance is reduced.

[0069] Specifically, the number of times that the hot-temperature loading stroke rate is compared with the cold-temperature loading stroke rate is recorded as a first comparison number, and the number of times that the hot-temperature unloading stroke rate is compared with the cold-temperature unloading stroke rate is recorded as a second comparison number. The sum of the first comparison number and the second comparison number is recorded as a total comparison number N. The abnormality number threshold K is associated with the total comparison number N. By setting the size relationship between the abnormality number threshold K and the total comparison number N, the warning sensitivity can be adjusted.

[0070] In this embodiment, three sensitivity levels are provided, which are a highest sensitivity level, a regular sensitivity level, and a conservative sensitivity level. Different sensitivity levels correspond to different abnormality number thresholds. When K=0.2N, the highest sensitivity level is used. When K=0.3N, the regular sensitivity level is used. When K=0.5N, the conservative sensitivity level is used. Taking the total comparison number N as 100 as an example, when the highest sensitivity level, the regular sensitivity level, and the conservative sensitivity level are set, the abnormality number threshold K is set as 20, 30, and 50, respectively.

[0071] Further, when comparing the number of abnormal times of the stroke rate with the threshold value of the abnormal times, a time window needs to be limited. For example, the last 4 hours are taken as a statistical window, and the four stroke rates are recalculated every 15 minutes to obtain a comparison result, and the comparison result is accumulated N times, and the N comparison results are used for judgment. Of course, when the sample data in the window is too small, the window is not included in the statistics. For example, when the number of any one of the hot shelf loading stroke rate, the hot shelf unloading stroke rate, the cold shelf loading stroke rate, and the cold shelf unloading stroke rate is less than 10, the window is excluded.

[0072] In another embodiment, the last 4 hours are taken as a statistical window, that is, the time period corresponding to the operation monitoring data is 4 hours. First, the slide valve stable operation data satisfying the slide valve stable condition is screened out from the operation monitoring data. The number of the slide valve stable operation data is multiple.

[0073] Each of the slide valve stable operation data includes multiple continuous power-on events. The candidate power-on events meeting the operation grading condition are screened out from the multiple continuous power-on events, and then are subdivided according to the hot shelf and the cold shelf to screen out the slide valve hot shelf power-on events and the slide valve cold shelf power-on events. Multiple slide valve hot shelf power-on events and multiple slide valve cold shelf power-on events can be screened out from one of the slide valve stable operation data.

[0074] Then, the slide valve hot shelf power-on events and the multiple slide valve cold shelf power-on events are further subdivided according to the loading and unloading directions. The slide valve hot shelf power-on events are divided into loading direction hot shelf events and unloading direction hot shelf events, and the slide valve cold shelf power-on events are divided into loading direction cold shelf events and unloading direction cold shelf events.

[0075] The number of the loading direction hot shelf events, the unloading direction hot shelf events, the loading direction cold shelf events, and the unloading direction cold shelf events is multiple. The unit power-on stroke rate of the loading direction hot shelf events, the unloading direction hot shelf events, the loading direction cold shelf events, and the unloading direction cold shelf events is calculated respectively, and the median is taken as the representative value to generate the hot shelf loading stroke rate, the hot shelf unloading stroke rate, the cold shelf loading stroke rate, and the cold shelf unloading stroke rate respectively.

[0076] At this time, four stroke rate data are obtained based on one of the slide valve stable operation data, which are the hot shelf loading stroke rate, the hot shelf unloading stroke rate, the cold shelf loading stroke rate, and the cold shelf unloading stroke rate. One-time comparison of the hot shelf loading stroke rate and the cold shelf loading stroke rate and one-time comparison of the hot shelf unloading stroke rate and the cold shelf unloading stroke rate can be performed on one of the slide valve stable operation data, and the result of one-time stroke rate abnormal times is obtained.

[0077] Since the number of the slide valve stable operation data is multiple, the statistics of multiple stroke rate abnormal times can be obtained. The number of the generated stroke rate abnormal times is the same as the number of the slide valve stable operation data.

[0078] For the purpose of uniformity of the basis of comparison, the comparison can also be performed only when the number of the stable operation data of the slide valve screened in the statistical window is consistent, so as to compare more accurately.

[0079] In another embodiment, the abnormality frequency threshold value can also be set based on the baseline of the historical health period. For example, the operation data of the selected slide valve in the failure-free period and meeting the stable condition of the slide valve is taken as the historical health data, the abnormality frequency of the stroke rate is calculated based on the historical health data, the 95th percentile of each calculated abnormality frequency of the stroke rate is taken, and the abnormality frequency threshold value is set.

[0080] It should be noted that the value of the abnormality frequency threshold value is not limited to the above examples. The setting method and example value of the abnormality frequency threshold value are only examples for easy understanding, and do not limit the protection scope of the technical solution.

[0081] In another embodiment, the abnormality frequency threshold value includes a loading abnormality threshold value and an unloading abnormality threshold value. The method further includes: Step S410: determining whether the loading abnormality frequency is greater than or equal to the loading abnormality threshold value, and if yes, generating a slide valve loading failure alarm, and if no, generating a slide valve loading normal indication; Step S420: determining whether the unloading abnormality frequency is greater than or equal to the unloading abnormality threshold value, and if yes, generating a slide valve unloading failure alarm, and if no, generating a slide valve unloading normal indication.

[0082] In this embodiment, since the working conditions, strokes of loading and unloading are different, the abnormality is determined by comparing whether the loading abnormality frequency is greater than or equal to the loading abnormality threshold value and whether the unloading abnormality frequency is greater than or equal to the unloading abnormality threshold value, respectively.

[0083] The loading abnormality threshold value and the unloading abnormality threshold value are set in advance. As in the previous embodiment, the setting of the loading abnormality threshold value and the unloading abnormality threshold value is respectively associated with the first comparison frequency and the second comparison frequency, and different sensitivities can also be set by setting different loading abnormality threshold values and unloading abnormality threshold values.

[0084] For example, the loading abnormality threshold value and the unloading abnormality threshold value are represented by k1 and k2, respectively. The first comparison frequency and the second comparison frequency are represented by n1 and n2, respectively. If the first comparison frequency n1 and the second comparison frequency n2 are both 100, and the conventional sensitivity is used, the loading abnormality threshold value and the unloading abnormality threshold value are both set to 30.

[0085] In one embodiment, the method further includes: Step S510: generating a symmetry index according to the hot load stroke rate and the hot unload stroke rate; Step S520: judging whether the slide valve is asymmetric according to the symmetry index; Step S530: if yes, generating a slide valve asymmetry alarm; if no, generating a normal symmetry.

[0086] In the embodiment, the hot load stroke rate and the hot unload stroke rate are respectively represented by and In step S510, the symmetry index is generated based on the following formula : When the value of the symmetry index is 0, it indicates that the unload and load directions of the slide valve are completely symmetric; if single direction is stuck, the value of or is 0, and the value of the symmetry index is 2. Therefore, the value range of the symmetry index is 0 to 2.

[0087] The symmetry index is used to evaluate the symmetry of the load and unload directions of the slide valve.

[0088] Then, in step S530, if the slide valve is judged to be asymmetric according to the symmetry index, a slide valve asymmetry alarm is generated; if no, a normal symmetry is generated. When the slide valve is judged to be asymmetric, it indicates that the slide valve may have mechanical problems such as large one-way friction, guide wear, and link asymmetry. Based on these possible problems, a suspicious fault prompt is generated to facilitate the maintenance personnel to maintain the slide valve.

[0089] In one embodiment, step S520: judging whether the slide valve is asymmetric according to the symmetry index, comprises: Step S521: judging whether the symmetry index is greater than or equal to a symmetry threshold value; Step S522: if no, judging that the slide valve is symmetric; if yes, judging that the slide valve is asymmetric.

[0090] In the embodiment, in order to improve the reliability of fault warning, the symmetry threshold value is preferably set to 0.3. When the symmetry index is greater than or equal to the symmetry threshold value, it is judged that the slide valve is asymmetric. Based on engineering practice, the symmetry index greater than 0.3 is relatively serious asymmetry, so the symmetry threshold value is preferably set to 0.3.

[0091] In another embodiment, in step S522, when the symmetry index is less than the symmetry threshold, it is further determined whether the symmetry index is greater than or equal to a medium asymmetry threshold; if it is determined that the symmetry index is greater than or equal to the medium asymmetry threshold, a slide valve symmetry attention indication is generated. If it is determined that the symmetry index is less than the medium asymmetry threshold, it is determined that the slide valve is symmetrical.

[0092] The medium asymmetry threshold is a value less than the symmetry threshold and is set in advance to distinguish the case where there is a suspicion of symmetry but not to the extent of alarming. Taking the symmetry threshold set as 0.3 as an example, the medium asymmetry threshold can be set as 0.25, that is, when the symmetry index is between 0.25 and 0.3, the slide valve asymmetry criterion is not reached, but the slide valve asymmetry tends to occur, and there is a greater possibility of slide valve asymmetry, so the user and the maintenance personnel need to be reminded of this matter, and therefore the slide valve symmetry attention indication is generated.

[0093] In one embodiment, as shown in FIG. 1, an energy station house equipment fault monitoring system is also provided, and the system comprises: Figure 2 A power-on event screening module is configured to acquire operation monitoring data of a screw water chiller in an energy station house, set a slide valve hot range power-on event and a slide valve cold range power-on event according to the operation monitoring data based on a slide valve stable condition; A power-on stroke generation module is configured to generate a hot range power-on stroke rate according to the slide valve hot range power-on event, and generate a cold range power-on stroke rate according to the slide valve cold range power-on event; An abnormal number generation module is configured to count a stroke rate abnormal number of the hot range power-on stroke rate being less than or equal to the cold range power-on stroke rate; A fault alarm determination module is configured to determine whether the stroke rate abnormal number is greater than or equal to an abnormal number threshold, and generate a slide valve fault alarm if it is determined that the stroke rate abnormal number is greater than or equal to the abnormal number threshold. In one embodiment, the power-on event screening module is further configured to extract slide valve stable operation data of the slide valve from the operation monitoring data based on a slide valve stable condition, wherein the slide valve stable condition is that a pressure difference between an oil pump outlet and an oil return is greater than or equal to a minimum required pressure, and filter differential pressures of a main oil filter and a control oil branch filter are both less than a preset differential pressure upper limit; and set the slide valve hot range power-on event and the slide valve cold range power-on event according to the slide valve stable operation data based on an operation grading condition.

[0094]

[0095] ​In one embodiment, the running sub-grade conditions include a minimum continuous energization time, a safe stroke range, and a minimum movement length; the energization event screening module is further configured to: extract continuous energization events of the spool and corresponding initial oil temperature, spool movement position, actual energization duration, and spool movement length of the continuous energization events from the spool stable running data; set continuous energization events with the actual energization duration greater than or equal to the minimum continuous energization time, the spool movement position within the safe stroke range, and the spool movement length greater than or equal to the minimum movement length as candidate energization events; and set spool hot-grade energization events and spool cold-grade energization events according to the candidate energization events.

[0096] In one embodiment, the running sub-grade conditions further include a cold-grade boundary temperature, a hot-grade boundary temperature, and a boundary temperature margin; the energization event screening module is further configured to: set candidate energization events with an initial oil temperature less than or equal to a cold-grade set temperature as spool cold-grade energization events, wherein the cold-grade set temperature is a value of the cold-grade boundary temperature minus the boundary temperature margin; and set candidate energization events with an initial oil temperature greater than or equal to a hot-grade set temperature as spool hot-grade energization events, wherein the hot-grade set temperature is a value of the hot-grade boundary temperature plus the boundary temperature margin.

[0097] In one embodiment, the spool hot-grade energization events include a loading-direction hot-grade event and an unloading-direction hot-grade event; the hot-grade energization stroke rate includes a hot-grade loading stroke rate and a hot-grade unloading stroke rate; and the energization stroke generation module is further configured to: generate a hot-grade loading unit stroke rate and a hot-grade unloading unit stroke rate according to spool displacement increments and actual energization durations corresponding to the loading-direction hot-grade event and the unloading-direction hot-grade event, respectively; calculate a median of each of the hot-grade loading unit stroke rates to generate the hot-grade loading stroke rate; and calculate a median of each of the hot-grade unloading unit stroke rates to generate the hot-grade unloading stroke rate.

[0098] In one embodiment, the spool hot-grade energization events include a loading-direction hot-grade event and an unloading-direction hot-grade event; the hot-grade energization stroke rate includes a hot-grade loading stroke rate and a hot-grade unloading stroke rate; and the energization stroke generation module is further configured to: generate a hot-grade loading unit stroke rate and a hot-grade unloading unit stroke rate according to spool displacement increments and actual energization durations corresponding to the loading-direction hot-grade event and the unloading-direction hot-grade event, respectively; calculate a median of each of the hot-grade loading unit stroke rates to generate the hot-grade loading stroke rate; and calculate a median of each of the hot-grade unloading unit stroke rates to generate the hot-grade unloading stroke rate.

[0099] In one embodiment, the abnormal number of times generating module is further configured to: count a number of times that the hot-file loading stroke rate is less than or equal to the cold-file loading stroke rate, denoted as a loading abnormal number of times; count a number of times that the hot-file unloading stroke rate is less than or equal to the cold-file unloading stroke rate, denoted as an unloading abnormal number of times; and add the loading abnormal number of times and the unloading abnormal number of times to obtain a stroke rate abnormal number of times.

[0100] In one embodiment, the fault alarm judging module is further configured to: generate a symmetry index according to the hot-file loading stroke rate and the hot-file unloading stroke rate; judge whether the spool is asymmetric according to the symmetry index; if the judgment is yes, generate a spool-asymmetry alarm; and if the judgment is no, generate a symmetry normality.

[0101] In one embodiment, the fault alarm judging module is further configured to: judge whether the symmetry index is greater than or equal to a symmetry threshold; if the judgment is no, judge that the spool is symmetric; and if the judgment is yes, judge that the spool is asymmetric.

[0102] It should be noted that the information interaction between the above modules, the execution process, and the like, since based on the same concept as the method embodiments of the present application, the specific functions and the brought technical effects can be referred to the method embodiments part, and will not be repeated here.

[0103] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is exemplified, and in actual application, the above-mentioned functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be realized in the form of hardware or software function unit. In addition, the specific names of each functional unit and module are only for easy distinction, and do not limit the protection scope of the present application. The specific working process of the unit and module in the above system can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0104] The embodiments of the present application also provide a network device, which comprises: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, wherein the processor implements the steps in any of the above method embodiments when executing the computer program.

[0105] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the steps in the above-mentioned various method embodiments.

[0106] The embodiment of the present application provides a computer program product. When the computer program product is run on a mobile terminal, the mobile terminal is caused to execute the steps in the above-mentioned various method embodiments.

[0107] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the present application can implement all or part of the processes in the above-mentioned embodiments by a computer program to instruct related hardware to complete, and the computer program can be stored in a computer readable storage medium. The computer program is executed by a processor to implement the steps in the above-mentioned various method embodiments. The computer program includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms. The computer readable medium at least includes any entity or device capable of carrying the computer program code to a photographing device / terminal equipment, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal and a software distribution medium. For example, a U disk, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, the computer readable medium cannot be an electrical carrier signal and a telecommunications signal.

[0108] In the above-mentioned embodiments, the description of each embodiment has its own focus. The parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0109] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0110] In the embodiments of the present application, it should be understood that the disclosed apparatus / network device and method can be implemented in other manners. For example, the described apparatus / network device embodiments are merely illustrative. For example, the division of the modules or units is only a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0111] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0112] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

[0113] An embodiment of the present application further provides a computer device, which comprises at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, wherein the processor executes the computer program to implement the steps in any of the above-described embodiments.

[0114] The computer device can include, but is not limited to, a processor, a memory. Those skilled in the art can understand that the above description is an example of the computer device, and does not constitute a limitation on the computer device, and can include more or fewer components than the above description, or combine some components, or different components, for example, can also include input / output devices, network access devices, etc.

[0115] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0116] The memory can be an internal storage unit of the computer device in some embodiments, for example, a hard disk or a memory of the computer device. The memory can also be an external storage device of the computer device in other embodiments, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the memory can include both the internal storage unit and the external storage device of the computer device. The memory is used to store an operating system, application programs, a boot loader, data, and other programs, for example, program codes of the computer program, etc. The memory can also be used to temporarily store data that has been output or will be output.

[0117] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0118] The above embodiments only express several implementation manners of the present application, and the description is specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method of monitoring equipment failure of a power station building, characterized by, The method comprises: obtaining operation monitoring data of a screw water chiller in an energy station house, setting a slide valve hot range power-on event and a slide valve cold range power-on event according to the operation monitoring data based on a slide valve stable condition; generating a hot range power-on stroke rate according to the slide valve hot range power-on event and a cold range power-on stroke rate according to the slide valve cold range power-on event; counting an abnormal stroke rate number of the hot range power-on stroke rate being less than or equal to the cold range power-on stroke rate; judging whether the abnormal stroke rate number is greater than or equal to an abnormal number threshold, and generating a slide valve fault alarm if the judgment is yes.

2. The method of claim 1, wherein, The slide valve hot range power-on event comprises a loading direction hot range event and an unloading direction hot range event; and the hot range power-on stroke rate comprises a hot range loading stroke rate and a hot range unloading stroke rate. Generating a hot range power-on stroke rate according to the slide valve hot range power-on event comprises: generating a hot range loading unit stroke rate and a hot range unloading unit stroke rate according to the slide valve displacement increment and the actual power-on time length corresponding to the loading direction hot range event and the unloading direction hot range event, respectively; calculating the median of each hot range loading unit stroke rate to generate a hot range loading stroke rate; calculating the median of each hot range unloading unit stroke rate to generate a hot range unloading stroke rate.

3. The method of claim 2, wherein, The slide valve cold range power-on event comprises a loading direction cold range event and an unloading direction cold range event; and the cold range power-on stroke rate comprises a cold range loading stroke rate and a cold range unloading stroke rate. Generating a cold range power-on stroke rate according to the slide valve cold range power-on event comprises: generating a cold range loading unit stroke rate and a cold range unloading unit stroke rate according to the slide valve displacement increment and the actual power-on time length corresponding to the loading direction cold range event and the unloading direction cold range event, respectively; calculating the median of each cold range loading unit stroke rate to generate a cold range loading stroke rate; calculating the median of each cold range unloading unit stroke rate to generate a cold range unloading stroke rate.

4. The method of claim 3, wherein, Counting an abnormal stroke rate number of the hot range power-on stroke rate being less than or equal to the cold range power-on stroke rate comprises: counting a loading abnormal number of the hot range loading stroke rate being less than or equal to the cold range loading stroke rate; counting an unloading abnormal number of the hot range unloading stroke rate being less than or equal to the cold range unloading stroke rate; adding the loading abnormal number and the unloading abnormal number to obtain the abnormal stroke rate number.

5. The method of claim 4, wherein, The method further comprises: generating a symmetry index according to the hot range loading stroke rate and the hot range unloading stroke rate; judging whether the slide valve is asymmetric according to the symmetry index; generating a slide valve asymmetry alarm if the judgment is yes, and generating a symmetry normality if the judgment is no.

6. The method of claim 5, wherein, Judging whether the slide valve is asymmetric according to the symmetry index comprises: judging whether the symmetry index is greater than or equal to a symmetry threshold; judging that the slide valve is symmetric if the judgment is no, and judging that the slide valve is asymmetric if the judgment is yes.

7. The method of claim 1, wherein, Setting a slide valve hot range power-on event and a slide valve cold range power-on event according to the operation monitoring data based on a slide valve stable condition comprises: extracting, from the operation monitoring data, slide valve stable operation data of the slide valve based on a slide valve stable condition, wherein the slide valve stable condition is that a pressure difference between an oil pump outlet and an oil return is greater than or equal to a minimum required pressure, and filter differential pressures of a main oil filter and a control oil branch filter are both less than or equal to a preset differential pressure upper limit; setting, based on an operation grading condition, a slide valve hot grade power-on event and a slide valve cold grade power-on event according to the slide valve stable operation data.

8. The method of claim 7, wherein, The operation grading condition includes a minimum continuous power-on time, a safe stroke range, and a minimum movement length. Setting, based on an operation grading condition, a slide valve hot grade power-on event and a slide valve cold grade power-on event according to the slide valve stable operation data includes: extracting, from the slide valve stable operation data, continuous power-on events of the slide valve, and starting oil temperatures, slide valve movement positions, actual power-on durations, and slide valve movement lengths corresponding to the continuous power-on events; setting, as alternative power-on events, continuous power-on events in which the actual power-on durations are greater than or equal to the minimum continuous power-on time, the slide valve movement positions are within the safe stroke range, and the slide valve movement lengths are greater than or equal to the minimum movement length; setting, based on the alternative power-on events, a slide valve hot grade power-on event and a slide valve cold grade power-on event.

9. The method of claim 8, wherein, The operation grading condition further includes a cold grade boundary temperature, a hot grade boundary temperature, and a boundary temperature margin. Setting, based on the alternative power-on events, a slide valve hot grade power-on event and a slide valve cold grade power-on event includes: setting, as a slide valve cold grade power-on event, an alternative power-on event corresponding to a starting oil temperature less than or equal to a cold grade set temperature, wherein the cold grade set temperature is a value obtained by subtracting the boundary temperature margin from the cold grade boundary temperature; setting, as a slide valve hot grade power-on event, an alternative power-on event corresponding to a starting oil temperature greater than or equal to a hot grade set temperature, wherein the hot grade set temperature is a value obtained by adding the boundary temperature margin to the hot grade boundary temperature.

10. An equipment failure monitoring system of a power station building, characterized by, The system includes: a power-on event screening module configured to acquire operation monitoring data of a screw water chiller in an energy station house, and set a slide valve hot grade power-on event and a slide valve cold grade power-on event according to the operation monitoring data based on a slide valve stable condition; a power-on stroke generation module configured to generate a hot grade power-on stroke rate according to the slide valve hot grade power-on event, and generate a cold grade power-on stroke rate according to the slide valve cold grade power-on event; an abnormal number of times generation module configured to count a stroke rate abnormal number of times in which the hot grade power-on stroke rate is less than or equal to the cold grade power-on stroke rate; a fault alarm judgment module configured to judge whether the stroke rate abnormal number of times is greater than or equal to an abnormal number of times threshold, and generate a slide valve fault alarm if the judgment is yes.

Images