Energy station building equipment failure monitoring method and system

Abstract

The application relates to the technical field of energy station building monitoring, in particular to an energy station building equipment fault monitoring method and system, which comprises the following steps: obtaining operation monitoring data of a screw water chiller in an energy station building, 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 value; and if the judgment is yes, generating a slide valve fault alarm. The application can solve the problems of affecting production and long time consumption caused by fault monitoring after the compressor is stopped and disassembled in the prior art.

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 the stopped state, which is prone to cause production interruption due to stopping, resulting in economic losses, and the disassembly process consumes a long time and is prone to damage other equipment and introduce new fault problems. The manual disassembly detection result is based on manual experience, and is prone to misjudgment.

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

[0006] The technical scheme of the present application is as follows:

[0007] An energy station house equipment fault monitoring method, the method comprising:

[0008] 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 based on a slide valve stable condition according to the operation monitoring data;

[0009] Generating a hot range power-on stroke rate according to the slide valve hot range power-on event, and generating a cold range power-on stroke rate according to the slide valve cold range power-on event;

[0010] Counting the number of stroke rate abnormalities when the hot range power-on stroke rate is less than or equal to the cold range power-on stroke rate;

[0011] Judging whether the number of stroke rate abnormalities is greater than or equal to an abnormality threshold value, and if the judgment is yes, generating a slide valve fault alarm.

[0012] Optionally, setting the slide valve hot range energization event and the slide valve cold range energization event based on the operation monitoring data according to the slide valve stable condition comprises:

[0013] Extracting the slide valve stable operation data of the slide valve from the operation 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 less than or equal to the preset differential pressure upper limit;

[0014] Setting the slide valve hot range energization event and the slide valve cold range energization event based on the operation grading condition according to the slide valve stable operation data.

[0015] Optionally, the operation grading condition comprises a minimum continuous energization time, a safe stroke range, and a minimum movement length;

[0016] Setting the slide valve hot range energization event and the slide valve cold range energization event based on the operation grading condition according to the slide valve stable operation data comprises:

[0017] Extracting the continuous energization event of the slide valve and the starting oil temperature, the slide valve movement position, the actual energization time, and the slide valve movement length corresponding to the continuous energization event from the slide valve stable operation data;

[0018] Setting the continuous energization event, in which the actual energization time 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, as an alternative energization event;

[0019] Setting the slide valve hot range energization event and the slide valve cold range energization event according to the alternative energization event.

[0020] Optionally, the operation grading condition further comprises a cold range boundary temperature, a hot range boundary temperature, and a boundary temperature margin;

[0021] Setting the slide valve hot range energization event and the slide valve cold range energization event according to the alternative energization event comprises:

[0022] Setting the alternative energization event corresponding to the starting oil temperature less than or equal to the cold range set temperature as the slide valve cold range energization event, wherein the cold range set temperature is the value of the cold range boundary temperature minus the boundary temperature margin;

[0023] Setting the alternative energization event corresponding to the starting oil temperature greater than or equal to the hot range set temperature as the slide valve hot range energization event, wherein the hot range set temperature is the value of the hot range boundary temperature plus the boundary temperature margin.

[0024] Optionally, the slide valve hot range energization event comprises a load direction hot range event and an unload direction hot range event.

[0025] The hot-filing stroke rate comprises a hot-filing loading stroke rate and a hot-filing unloading stroke rate.

[0026] The hot-filing stroke rate is generated according to the slide valve hot-filing event, comprising:

[0027] According to the slide valve displacement increment and the actual energizing time length corresponding to the loading direction hot-filing event and the unloading direction hot-filing event, a hot-filing loading unit stroke rate and a hot-filing unloading unit stroke rate are respectively generated;

[0028] The median of each hot-filing loading unit stroke rate is calculated to generate a hot-filing loading stroke rate;

[0029] The median of each hot-filing unloading unit stroke rate is calculated to generate a hot-filing unloading stroke rate.

[0030] Optionally, the slide valve cold-filing event comprises a loading direction cold-filing event and an unloading direction cold-filing event.

[0031] The cold-filing stroke rate comprises a cold-filing loading stroke rate and a cold-filing unloading stroke rate.

[0032] The cold-filing stroke rate is generated according to the slide valve cold-filing event, comprising:

[0033] According to the slide valve displacement increment and the actual energizing time length corresponding to the loading direction cold-filing event and the unloading direction cold-filing event, a cold-filing loading unit stroke rate and a cold-filing unloading unit stroke rate are respectively generated;

[0034] The median of each cold-filing loading unit stroke rate is calculated to generate a cold-filing loading stroke rate;

[0035] The median of each cold-filing unloading unit stroke rate is calculated to generate a cold-filing unloading stroke rate.

[0036] Optionally, the stroke rate anomaly number is counted by comparing the hot-filing stroke rate with the cold-filing stroke rate, comprising:

[0037] The number of times that the hot-filing loading stroke rate is less than or equal to the cold-filing loading stroke rate is counted, which is recorded as a loading anomaly number;

[0038] The number of times that the hot-filing unloading stroke rate is less than or equal to the cold-filing unloading stroke rate is counted, which is recorded as an unloading anomaly number;

[0039] The loading anomaly number and the unloading anomaly number are added to obtain the stroke rate anomaly number.

[0040] Optionally, the method further comprises:

[0041] generate a symmetry index according to the hot unloading stroke rate and the hot loading stroke rate;

[0042] determine whether the slide valve is asymmetric according to the symmetry index;

[0043] if yes, generate a slide valve asymmetry warning; if no, generate a normal symmetry.

[0044] Optionally, determining whether the slide valve is asymmetric according to the symmetry index comprises:

[0045] determining whether the symmetry index is greater than or equal to a symmetry threshold value;

[0046] if no, determining that the slide valve is symmetric; if yes, determining that the slide valve is asymmetric.

[0047] Optionally, an equipment fault monitoring system of an energy station house is also provided, and the system comprises:

[0048] a power-on event screening module configured to acquire operation monitoring data of a screw water chiller in the energy station house, and set a slide valve hot power-on event and a slide valve cold power-on event according to the operation monitoring data based on a slide valve stable condition;

[0049] a power-on stroke generation module configured to generate a hot power-on stroke rate according to the slide valve hot power-on event, and generate a cold power-on stroke rate according to the slide valve cold power-on event;

[0050] an abnormal number generation module configured to count a stroke rate abnormal number of the hot power-on stroke rate being less than or equal to the cold power-on stroke rate;

[0051] a fault warning determination module configured to determine whether the stroke rate abnormal number is greater than or equal to an abnormal number threshold value, and if yes, generate a slide valve fault warning.

[0052] Optionally, 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 power-on event and the slide valve cold power-on event according to the slide valve stable operation data based on an operation grading condition.

[0053] Optionally, the running grading condition comprises 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 starting oil temperatures corresponding to the continuous energization events, spool movement positions, actual energization durations and spool movement lengths from the spool stable running data; set continuous energization events with the actual energization durations greater than or equal to the minimum continuous energization time, the spool movement positions within the safe stroke range and the spool movement lengths greater than or equal to the minimum movement length as alternative energization events; set spool hot-grade energization events and spool cold-grade energization events according to the alternative energization events.

[0054] Optionally, the running grading condition further comprises 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 alternative energization events with starting oil temperatures less than or equal to a cold-grade setting temperature as spool cold-grade energization events, wherein the cold-grade setting temperature is a value of the cold-grade boundary temperature minus the boundary temperature margin; set alternative energization events with starting oil temperatures greater than or equal to a hot-grade setting temperature as spool hot-grade energization events, wherein the hot-grade setting temperature is a value of the hot-grade boundary temperature plus the boundary temperature margin.

[0055] Optionally, the spool hot-grade energization events comprise loading-direction hot-grade events and unloading-direction hot-grade events; the hot-grade energization stroke rate comprises a hot-grade loading stroke rate and a hot-grade unloading stroke rate; 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 respectively according to spool displacement increments and actual energization durations corresponding to the loading-direction hot-grade events and the unloading-direction hot-grade events; calculate a median of each hot-grade loading unit stroke rate to generate a hot-grade loading stroke rate; calculate a median of each hot-grade unloading unit stroke rate to generate a hot-grade unloading stroke rate.

[0056] Optionally, the spool hot-grade energization events comprise loading-direction hot-grade events and unloading-direction hot-grade events; the hot-grade energization stroke rate comprises a hot-grade loading stroke rate and a hot-grade unloading stroke rate; 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 respectively according to spool displacement increments and actual energization durations corresponding to the loading-direction hot-grade events and the unloading-direction hot-grade events; calculate a median of each hot-grade loading unit stroke rate to generate a hot-grade loading stroke rate; calculate a median of each hot-grade unloading unit stroke rate to generate a hot-grade unloading stroke rate.

[0057] Optionally, the abnormal number of times generating module is further configured to: count 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 abnormal number of times; count 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 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.

[0058] Optionally, 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.

[0059] Optionally, 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.

[0060] Optionally, a computer device is further provided, which comprises a memory and a processor, the memory stores a computer program, and the processor implements the steps of the energy station device fault monitoring method when executing the computer program.

[0061] Optionally, a computer readable storage medium is further provided, which stores a computer program, and the computer program implements the steps of the energy station device fault monitoring method when executed by a processor.

[0062] The present application achieves the following technical effects:

[0063] 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

[0064] Figure 1 This is a flowchart illustrating an equipment fault monitoring method for an energy station in one embodiment;

[0065] Figure 2 A structure block diagram of a device fault monitoring system of a power station house in one embodiment. DETAILED DESCRIPTION

[0066] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, circuits, and

[0067] It will be understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0068] It will be understood that the term "and / or," when used in the specification and in the following claims, can comprise one or more of the associated listed items and can refer to all possible combinations of these items.

[0069] As used in this specification and claims, the terms "if", "for example", and "as an example" can be used to express a causal relationship between events, conditions, or circumstances, and the conditions admit of a broad interpretation in other contexts. Similarly, the phrase "if it is determined" or "if it is detected" can be interpreted to mean "upon determination" or "in response to a determination" or "upon detection" or "in response to a detection" of the described condition or event.

[0070] In addition, the terms "first", "second", "third", etc. are used herein only to describe different instances of the same item and do not imply relative importance of the items.

[0071] 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

[0072] 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.

[0073] The terminal can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers and portable wearable devices.

[0074] In one embodiment, as shown in Figure 1 An equipment fault monitoring method of an energy station house is provided, including:

[0075] 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;

[0076] 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;

[0077] 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;

[0078] 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.

[0079] In this embodiment, by obtaining the operation monitoring data of the screw water chiller in the energy station house, the running monitoring data in the running process 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, and the problem of inaccurate data monitoring caused by unstable conditions is avoided; by screening the slide valve hot range power-on event and the slide valve cold range power-on event, fault judgment is realized after the 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 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 driving of the lubricating oil; when 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 driving of the lubricating oil will be slower than that in the hot range, that is, in 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, 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.

[0080] 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 according to the running monitoring data based on the slide valve stable condition, which includes:

[0081] Step S110: extracting the slide valve stable operation data of the slide valve 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 less than or equal to the preset differential pressure upper limit;

[0082] Step S120: based on the running grading condition, setting the slide valve hot grading power-on event and the slide valve cold grading power-on event according to the slide valve stable running data.

[0083] 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 affect the fault monitoring judgment result, the pressure difference between the oil pump outlet and the return oil 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 the static friction, the sealing pre-tightening and the 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.

[0084] The filter differential pressure of the main oil filter is the pressure difference before and after the main oil filter, which is recorded 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, which is recorded 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 to cause the differential pressure to rise, it is easy to misjudge the problem of limited oil supply or the problem of limited oil supply as the 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] In one embodiment, the operating grading conditions include the shortest continuous power-on time, the safe travel range, and the shortest travel length;

[0090] 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:

[0091] 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;

[0092] 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;

[0093] Step S123: Set the hot-side energizing event and the cold-side energizing event of the slide valve according to the alternative energizing events.

[0094] In this embodiment, when the capacity of the screw water chiller is adjusted, the structure of the slide valve, the hydraulic cylinder and the 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.

[0095] 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 inaccuracy of the monitoring result caused by the instability. The minimum continuous energization time is generally set to be between 1 second and 2 seconds, and preferably, 1.5 seconds.

[0096] The safe stroke range refers to 2% FS to 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.

[0097] The setting of the minimum movement length is related to the rated full stroke of the slide valve, and is generally set to be at least 1% FS to 2% FS, for example, 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, the minimum movement length is set to filter out the control events in which the slide valve hardly moves.

[0098] 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 in the whole process of the continuous energization event. The actual energization duration refers to the duration of the whole continuous energization event. The slide valve movement length refers to the difference between the starting position and the end position of the slide valve in the whole 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. The slide valve movement length is the absolute value of the difference between x0 and x1.

[0099] 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, so as to facilitate better screening of the slide valve hot energization event and the slide valve cold energization event in subsequent step S123. The slide valve movement position within the safe stroke range means that the movement position of the slide valve is always within the safe stroke range.

[0100] In one embodiment, the running division condition further includes a cold division boundary temperature, a hot division boundary temperature and a boundary temperature margin.

[0101] 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:

[0102] Step S1231: setting the alternative energizing event corresponding to the starting oil temperature less than or equal to the cold range setting temperature as the slide valve cold range energizing event, wherein the cold range setting temperature is the value of the cold range boundary temperature minus the boundary temperature margin;

[0103] Step S1232: setting the alternative energizing event corresponding to the starting oil temperature greater than or equal to the hot range setting temperature as the slide valve hot range energizing event, wherein the hot range setting temperature is the value of the hot range boundary temperature plus the boundary temperature margin.

[0104] 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℃.

[0105] 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.

[0106] The temperature measurement noise is prone to cause step change when jumping around the boundary temperature, and then the boundary temperature margin is set, the cold range setting temperature is obtained by subtracting the boundary temperature margin from the cold range boundary temperature, and the hot range setting temperature is obtained by adding the boundary temperature margin to the hot range boundary temperature. Only when the initial oil temperature is less than or equal to the cold range setting temperature, the cold range energization event of the spool valve is set, and only when the initial oil temperature is greater than or equal to the hot range setting temperature, the hot range energization event of the spool valve is set, and the rest of the samples are directly rejected and do not participate in statistics and subsequent fault monitoring judgment.

[0107] In one embodiment, the cold range boundary temperature is set to about 40℃, for example 40℃. The hot range boundary temperature is set to about 55℃, for example 56℃. The boundary temperature margin is preferably selected from the range of 0.5℃ to 2℃.

[0108] In one embodiment, the hot range energization event of the spool valve includes a hot range event in the loading direction and a hot range event in the unloading direction.

[0109] The hot range energization stroke rate includes a hot range loading stroke rate and a hot range unloading stroke rate.

[0110] In step S200, the hot range energization stroke rate is generated according to the hot range energization event of the spool valve, including:

[0111] In step S211, the hot range loading unit stroke rate and the hot range unloading unit stroke rate are respectively generated according to the corresponding spool displacement increment and actual energization time length of the hot range event in the loading direction and the hot range event in the unloading direction.

[0112] In step S212, the median of each hot range loading unit stroke rate is calculated to generate the hot range loading stroke rate.

[0113] In step S213, the median of each hot range unloading unit stroke rate is calculated to generate the hot range unloading stroke rate.

[0114] 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 spool valve towards the full load end. The hot range unloading stroke rate refers to the energization event in which the spool valve moves towards the direction of reducing the compressor displacement.

[0115] In step S211, the hot range loading unit stroke rate is generated based on the following formula:

[0116]

[0117] wherein, is the hot range loading unit stroke rate, is the spool displacement increment corresponding to the hot range event in the loading direction. is the actual energization duration corresponding to the hot-stroke event in the loading direction. To illustrate the slide valve displacement increment, take the time corresponding to the continuous energization event as t0-t1, and the positions corresponding to t0 and t1 as x0 and x1 respectively, the slide valve displacement increment is the value of x1 minus x0, and the unit of x0 and x1 is %FS, where FS represents the rated full stroke of the slide valve.

[0118] The hot-stroke unloading unit stroke rate adopts the same formula as the hot-stroke loading unit stroke rate, and those skilled in the art should know how to calculate, and this application will not be repeated.

[0119] In steps S212 to S213, the median of each hot-stroke loading unit stroke rate is set as the hot-stroke loading stroke rate, and the median of each hot-stroke unloading unit stroke rate is set as the hot-stroke unloading stroke rate, to facilitate subsequent comparison of hot and cold strokes based on loading and unloading.

[0120] In one embodiment, the slide valve cold-stroke energization event includes a cold-stroke event in the loading direction and a cold-stroke event in the unloading direction;

[0121] The cold-stroke energization stroke rate includes a cold-stroke loading stroke rate and a cold-stroke unloading stroke rate;

[0122] In step S200, the cold-stroke energization stroke rate is generated according to the slide valve cold-stroke energization event, including:

[0123] Step S221: According to the slide valve displacement increment and the actual energization duration corresponding to the cold-stroke event in the loading direction and the cold-stroke event in the unloading direction, respectively generate a cold-stroke loading unit stroke rate and a cold-stroke unloading unit stroke rate;

[0124] Step S222: Calculate the median of each cold-stroke loading unit stroke rate to generate a cold-stroke loading stroke rate;

[0125] Step S223: Calculate the median of each cold-stroke unloading unit stroke rate to generate a cold-stroke unloading stroke rate.

[0126] In this embodiment, the cold-stroke loading stroke rate and the cold-stroke unloading stroke rate adopt the same formula as the generation of the hot-stroke loading unit stroke rate described above, and this application will not be repeated.

[0127] Similarly, by calculating the median of each cold-stroke loading unit stroke rate to generate a cold-stroke loading stroke rate, and calculating the median of each cold-stroke unloading unit stroke rate to generate a cold-stroke unloading stroke rate, it is convenient for subsequent comparison of hot and cold strokes based on unloading and loading.

[0128] In one embodiment, the step S300 of counting the number of times of stroke rate anomaly that the hot file energizing stroke rate is less than or equal to the cold file energizing stroke rate comprises:

[0129] The step S310 of counting the number of times that the hot file loading stroke rate is less than or equal to the cold file loading stroke rate is recorded as the number of loading anomalies.

[0130] The step S320 of counting the number of times that the hot file unloading stroke rate is less than or equal to the cold file unloading stroke rate is recorded as the number of unloading anomalies.

[0131] The step S330 of adding the number of loading anomalies and the number of unloading anomalies to obtain the number of times of stroke rate anomaly.

[0132] In this embodiment, taking the loading and the hot file as the reference, the hot file loading stroke rate is compared with the cold file loading stroke rate, and the number of times that the hot file loading stroke rate is less than or equal to the cold file loading stroke rate is counted and recorded as the number of loading anomalies.

[0133] Taking the unloading and the hot file as the reference, the hot file unloading stroke rate is compared with the cold file unloading stroke rate, and the number of times that the hot file unloading stroke rate is less than or equal to the cold file unloading stroke rate is counted and recorded as the number of unloading anomalies. Finally, the number of loading anomalies and the number of unloading anomalies are added to obtain the number of times of stroke rate anomaly. The greater the number of times of stroke rate anomaly, the greater the probability of mechanical jamming failure of the spool, and the more necessary it is to generate a warning.

[0134] In one embodiment, in the step S400, if the number of times of stroke rate anomaly is greater than or equal to the threshold value of the number of times of anomaly, 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 warning caused by dry friction or jamming. Through the first warning report, subsequent maintenance personnel can carry out targeted maintenance, thereby reducing the time cost of maintenance.

[0135] Specifically, the number of times of comparison between the hot file loading stroke rate and the cold file loading stroke rate is recorded as the first comparison number, and the number of times of comparison between the hot file unloading stroke rate and the cold file unloading stroke rate is recorded as the second comparison number. The sum of the first comparison number and the second comparison number is recorded as the total comparison number N. The threshold value K of the number of times of anomaly is associated with the total comparison number N. By setting the size relationship between the threshold value K of the number of times of anomaly and the total comparison number N, the warning sensitivity can be adjusted.

[0136] In this embodiment, three sensitivity levels are provided, i.e. the highest sensitivity, the regular sensitivity and the conservative sensitivity, and different sensitivity levels correspond to different abnormality times thresholds. When K=0.2N, it is the highest sensitivity; when K=0.3N, it is the regular sensitivity; and when K=0.5N, it is the conservative sensitivity. Taking N=100 as an example, when the highest sensitivity, the regular sensitivity and the conservative sensitivity are set, the abnormality times threshold K is set to 20, 30 and 50 respectively.

[0137] Further, when comparing the trip rate abnormality times with the abnormality times threshold, a time window needs to be limited. For example, taking the last 4 hours as a statistical window, the four trip rates are recalculated every 15 minutes to obtain a comparison result, the N comparison results are accumulated, 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 trip rate, the hot shelf unloading trip rate, the cold shelf loading trip rate and the cold shelf unloading trip rate is less than 10, the window is excluded.

[0138] In another embodiment, the last 4 hours are taken as a statistical window, i.e. the time period corresponding to the running monitoring data is 4 hours. First, the slide valve stable running data meeting the slide valve stable condition are screened out from the running monitoring data. The number of the slide valve stable running data is multiple.

[0139] Each of the slide valve stable running data includes multiple continuous power-on events, the candidate power-on events meeting the running grading condition are screened out from the multiple continuous power-on events, and then the hot shelf and the cold shelf are subdivided 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 running data.

[0140] 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.

[0141] 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 trip 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 trip rate, the hot shelf unloading trip rate, the cold shelf loading trip rate and the cold shelf unloading trip rate respectively.

[0142] At this time, four stroke rate data are obtained based on one said spool stable operation data, which are hot load stroke rate, hot unload stroke rate, cold load stroke rate and cold unload stroke rate respectively. One said spool stable operation data can be compared with the hot load stroke rate and the cold load stroke rate, and compared with the hot unload stroke rate and the cold unload stroke rate, and the result of the number of abnormal strokes is obtained.

[0143] Since the number of said spool stable operation data is multiple, the number of abnormal strokes can be obtained. The number of generated abnormal strokes is the same as the number of said spool stable operation data.

[0144] In order to unify the basis of comparison, the number of said spool stable operation data filtered in the statistical window can also be consistent before comparison, so as to compare more accurately.

[0145] In another embodiment, said abnormal number threshold can also be set based on the baseline of the historical health period. For example, the operation data of the selected spool in the fault-free period and meeting the above-mentioned spool stable condition is taken as the historical health data, and the number of abnormal strokes is calculated based on the historical health data, the 95th percentile of each calculated number of abnormal strokes is taken, and is set as said abnormal number threshold.

[0146] It should be noted that the value of said abnormal number threshold is not limited to the above-mentioned examples. The setting method and example value of said abnormal number threshold are only examples for easy understanding, and do not limit the protection scope of the technical solution.

[0147] In another embodiment, said abnormal number threshold includes a load abnormal threshold and an unload abnormal threshold. The method further includes:

[0148] Step S410: judging whether said load abnormal number is greater than or equal to said load abnormal threshold, if yes, generating a spool load fault alarm, if no, generating a spool load normal indication;

[0149] Step S420: judging whether said unload abnormal number is greater than or equal to said unload abnormal threshold, if yes, generating a spool unload fault alarm, if no, generating a spool unload normal indication.

[0150] In this embodiment, since the working conditions and strokes of loading and unloading are different, the abnormality is judged by comparing whether said load abnormal number is greater than or equal to said load abnormal threshold, and whether said unload abnormal number is greater than or equal to said unload abnormal threshold.

[0151] Both the loading anomaly threshold and the unloading anomaly threshold are preset. Similar to the previous embodiment, the settings of the loading anomaly threshold and the unloading anomaly threshold are respectively related to the first comparison count and the second comparison count. Different sensitivities can also be set by setting different loading anomaly thresholds and unloading anomaly thresholds.

[0152] For example, the loading anomaly threshold and the unloading anomaly threshold are represented by k1 and k2, respectively. The first comparison count and the second comparison count are represented by n1 and n2, respectively. If both the first comparison count n1 and the second comparison count n2 are 100, and a conventional sensitivity is used, then both the loading anomaly threshold and the unloading anomaly threshold are set to 30.

[0153] In one embodiment, the method further includes:

[0154] Step S510: Generate a symmetry index based on the hot-spot loading stroke rate and the hot-spot unloading stroke rate;

[0155] Step S520: Determine whether the slide valve is asymmetrical based on the symmetry index;

[0156] Step S530: If the judgment is yes, generate a slide valve asymmetry alarm; if the judgment is no, generate a symmetry normal alarm.

[0157] In this embodiment, the hot-load stroke rate and the hot-unload stroke rate are respectively used as and In step S510, a symmetry index is generated based on the following formula. :

[0158]

[0159] When the symmetry index When the value is 0, it indicates that the unloading and loading directions of the slide valve are completely symmetrical; if it is stuck in one direction, then... or The value of is 0, at which point the symmetry index is... The value is 2. Therefore, the symmetry index The value range is from 0 to 2.

[0160] The symmetry index is used to evaluate the symmetry of the loading and unloading directions of the slide valve.

[0161] Then, in step S530, if it is determined that the slide valve is not symmetrical according to the symmetry index, a slide valve asymmetry warning is generated; if it is determined that the slide valve is symmetrical, a symmetry normality is generated. When it is determined that the slide valve is not symmetrical, it indicates that the slide valve may have mechanical problems such as one-way friction, guide wear, and connecting rod asymmetry. A suspicious fault prompt is generated based on these possible problems to facilitate the maintenance personnel to maintain the slide valve.

[0162] In one embodiment, step S520: determining whether the slide valve is not symmetrical according to the symmetry index, comprises:

[0163] Step S521: determining whether the symmetry index is greater than or equal to the symmetry threshold value;

[0164] Step S522: if it is determined that the slide valve is not symmetrical, a slide valve asymmetry warning is generated; if it is determined that the slide valve is symmetrical, a symmetry normality is generated.

[0165] In this embodiment, in order to improve the reliability of fault warning, the symmetry threshold value is preferably set to 0.3. When it is determined that the symmetry index is greater than or equal to the symmetry threshold value, it is determined that the slide valve is not symmetrical. Based on engineering practice, when the symmetry index is greater than 0.3, it is relatively serious asymmetry, so the symmetry threshold value is preferably set to 0.3.

[0166] In another embodiment, in step S522, when it is determined that the symmetry index is less than the symmetry threshold value, it is further determined whether the symmetry index is greater than or equal to a medium asymmetry threshold value; if it is determined that the symmetry index is greater than or equal to the medium asymmetry threshold value, a slide valve symmetry attention indication is generated. If it is determined that the symmetry index is less than the medium asymmetry threshold value, it is determined that the slide valve is symmetrical.

[0167] The medium asymmetry threshold value is a value less than the symmetry threshold value and is used to distinguish between cases that may have symmetry suspicion but do not need to be warned. For example, when the symmetry threshold value is set to 0.3, the medium asymmetry threshold value can be set to 0.25. That is, when the symmetry index is between 0.25 and 0.3, it does not reach the standard of slide valve asymmetry, but tends to be asymmetrical and has a high possibility of being asymmetrical. Therefore, a slide valve symmetry attention indication is generated to remind the user and the maintenance personnel of this matter.

[0168] In one embodiment, as shown in Figure 2 Further provided is an equipment fault monitoring system of an energy station house, the system comprising:

[0169] A power-on event screening module is configured to acquire operation monitoring data of a screw water chiller in the 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;

[0170] a power-on stroke generation module configured to generate a hot power-on stroke rate according to the hot power-on event of the spool and generate a cold power-on stroke rate according to the cold power-on event of the spool;

[0171] an abnormality times generation module configured to count a stroke rate abnormality times that the hot power-on stroke rate is less than or equal to the cold power-on stroke rate;

[0172] a fault alarm judgment module configured to judge whether the stroke rate abnormality times is greater than or equal to an abnormality times threshold, and generate a spool fault alarm if the judgment is yes.

[0173] In an embodiment, the power-on event screening module is further configured to: extract spool stable operation data of the spool from the operation monitoring data based on a spool stable condition, wherein the spool stable condition is that a pressure difference between an oil pump outlet and a return oil 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 hot power-on event of the spool and the cold power-on event of the spool according to the spool stable operation data based on an operation grading condition.

[0174] In an embodiment, the operation grading condition includes a minimum continuous power-on time, a safe stroke range, and a minimum movement length; and the power-on event screening module is further configured to: extract continuous power-on events of the spool, and starting oil temperatures, spool movement positions, actual power-on durations, and spool movement lengths corresponding to the continuous power-on events from the spool stable operation data; set a continuous power-on event, in which the actual power-on duration is greater than or equal to the minimum continuous power-on time, the spool movement position is within the safe stroke range, and the spool movement length is greater than or equal to the minimum movement length, as a candidate power-on event; and set the hot power-on event of the spool and the cold power-on event of the spool according to the candidate power-on event.

[0175] In an embodiment, the operation grading condition further includes a cold edge temperature, a hot edge temperature, and an edge temperature margin; and the power-on event screening module is further configured to: set a candidate power-on event corresponding to a starting oil temperature less than or equal to a cold edge set temperature as the cold power-on event of the spool, wherein the cold edge set temperature is a value obtained by subtracting the edge temperature margin from the cold edge temperature; and set a candidate power-on event corresponding to a starting oil temperature greater than or equal to a hot edge set temperature as the hot power-on event of the spool, wherein the hot edge set temperature is a value obtained by adding the edge temperature margin to the hot edge temperature.

[0176] In one embodiment, the hot valve 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 according to the corresponding valve displacement increment and actual energizing time length of the loading direction hot stroke event and the unloading direction hot stroke event, respectively; 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.

[0177] In one embodiment, the cold valve 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 according to the corresponding valve displacement increment and actual energizing time length of the loading direction cold stroke event and the unloading direction cold stroke event, respectively; 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.

[0178] In one embodiment, 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.

[0179] In one embodiment, 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 valve is asymmetric according to the symmetry index; if the judgment is yes, generate a valve asymmetry alarm; and if the judgment is no, generate a symmetry normality.

[0180] 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 value; if the judgment is no, judge that the valve is symmetric; and if the judgment is yes, judge that the valve is asymmetric.

[0181] It should be noted that the information interaction, execution process, and the like between the above modules, since based on the same concept as the method embodiments of the present application, the specific functions and the resulting technical effects can be referred to the method embodiments part, and will not be described here.

[0182] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional units and modules is exemplified, and in actual application, the above functions can be completed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to complete all or part of the above described functions. Each functional unit or 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 integrated unit can be realized in the form of hardware or in the form of a software functional unit. In addition, the specific name of each functional unit or module is only for convenient distinction, and does not limit the protection scope of the present application. The specific working process of the unit or module in the system can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0183] The embodiments of the present application further provide a network device, comprising 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.

[0184] The embodiments of the present application further provide a computer readable storage medium, which stores a computer program, wherein the computer program is executable by a processor to implement the steps in any of the above method embodiments.

[0185] The embodiments of the present application provide a computer program product, which, when running on a mobile terminal, enables the mobile terminal to implement the steps in any of the above method embodiments.

[0186] The integrated unit, if implemented in the form of a software function 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 embodiment methods through a computer program to instruct relevant hardware to complete, and the computer program can be stored in a computer readable storage medium. When the computer program is executed by a processor, the steps of each method embodiment described above can be implemented. 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 the photographing device / terminal equipment, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. For example, U disk, mobile hard disk, magnetic disk or optical disk, etc. In some jurisdictions, according to legislation and patent practice, the computer readable medium can not be an electrical carrier signal and a telecommunication signal.

[0187] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0188] Those of ordinary skill in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Professionals 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.

[0189] In the embodiments provided by the present application, it should be understood that the disclosed apparatus / network device and method can be implemented in other ways. For example, the above-described apparatus / network device embodiments are merely schematic, for example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0190] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0191] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not 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 replacement to part of the 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.

[0192] An embodiment of the present application further provides a computer device, the computer device of the embodiment comprising: 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 methods when executing the computer program.

[0193] 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 less components than the above description, or combine certain components, or different components, for example, can also include input / output devices, network access devices, etc.

[0194] The processor can be a central processing unit (CPU), and the processor 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 gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0195] The memory can be an internal storage unit of the computer device in some embodiments, such as 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, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, and the like. Further, the memory can include both an internal storage unit and an external storage device of the computer device. The memory is used to store an operating system, an application program, a boot loader, data, and other programs, such as program codes of the computer program, and the like. The memory can also be used to temporarily store data that has been output or is to be output.

[0196] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure as long as the combination does not result in a contradiction.

[0197] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for monitoring equipment faults in an energy station, characterized in that, The method includes: Obtain the operation monitoring data of the screw chiller unit in the energy station, and set the hot-side energizing event and the cold-side energizing event of the slide valve based on the stability condition of the slide valve and the operation monitoring data. The hot-side energizing stroke rate is generated based on the hot-side energizing event of the slide valve, and the cold-side energizing stroke rate is generated based on the cold-side energizing event of the slide valve. Count the number of stroke rate anomalies where the hot section's energizing stroke rate is less than or equal to the cold section's energizing stroke rate; Determine whether the number of abnormal stroke rates is greater than or equal to the abnormal number threshold. If the determination is yes, generate a slide valve fault alarm. The energizing event of the hot stop of the slide valve includes a hot stop event in the loading direction and a hot stop event in the unloading direction; the energizing stroke rate of the hot stop includes the hot stop loading stroke rate and the hot stop unloading stroke rate. The hot-slot energizing stroke rate is generated based on the hot-slot energizing event of the slide valve, including: Based on the valve displacement increment and actual energization duration corresponding to the loading direction hot-slot event and the unloading direction hot-slot event, the hot-slot loading unit stroke rate and the hot-slot unloading unit stroke rate are generated respectively. Calculate the median of the hot-slot loading unit stroke rate for each of the aforementioned hot slots, and generate the hot-slot loading stroke rate; Calculate the median of the unloading unit stroke rate for each hot section to generate the hot section unloading stroke rate; Based on the stability conditions of the spool valve, and according to the aforementioned operational monitoring data, the following events are set: Spool valve hot-side energizing event and spool valve cold-side energizing event. Based on the spool valve stability conditions, the stable operation data of the spool valve is extracted from the operation monitoring data. The spool valve stability conditions are: the pressure difference between the oil pump outlet and the return oil is greater than or equal to the minimum required pressure and the filter differential pressure between the main oil filter and the control oil branch filter does not exceed the preset differential pressure upper limit. Based on the operating conditions, the hot-side energizing event and the cold-side energizing event of the slide valve are set according to the stable operating data of the slide valve.

2. The equipment fault monitoring method for energy station buildings according to claim 1, characterized in that, The energizing event for the cold stop of the slide valve includes a cold stop event in the loading direction and a cold stop event in the unloading direction; the energizing stroke rate for the cold stop includes the cold stop loading stroke rate and the cold stop unloading stroke rate. The cold-stop energization stroke rate is generated based on the aforementioned cold-stop energization event of the slide valve, including: Based on the valve displacement increment and actual energization duration corresponding to the cold stop event in the loading direction and the cold stop event in the unloading direction, the unit stroke rate of cold stop loading and the unit stroke rate of cold stop unloading are generated respectively. Calculate the median of the cold load unit stroke rate for each of the aforementioned cold loads to generate the cold load stroke rate; Calculate the median of the cold-load unloading unit stroke rate for each of the aforementioned cold-load unloading units, and generate the cold-load unloading stroke rate.

3. The equipment fault monitoring method for energy station buildings according to claim 2, characterized in that, The number of stroke rate anomalies where the hot-side power-on stroke rate is less than or equal to the cold-side power-on stroke rate includes: The number of times the hot load stroke rate is less than or equal to the cold load stroke rate is recorded as the number of loading anomalies; The number of times the hot-load unloading stroke rate is less than or equal to the cold-load unloading stroke rate is recorded as the number of unloading anomalies; The number of loading anomalies and the number of unloading anomalies are added together to obtain the number of trip rate anomalies.

4. The equipment fault monitoring method for energy station buildings according to claim 3, characterized in that, The method further includes: A symmetry index is generated based on the hot-load stroke rate and the hot-load unload stroke rate; Determine whether the slide valve is asymmetrical based on the aforementioned symmetry index; If the judgment is yes, an alarm for valve asymmetry will be generated; if the judgment is no, an alarm for normal symmetry will be generated.

5. The equipment fault monitoring method for energy station buildings according to claim 4, characterized in that, Determining whether a slide valve is asymmetrical based on the aforementioned symmetry index includes: Determine whether the symmetry index is greater than or equal to the symmetry threshold; If the judgment is negative, the spool valve is considered symmetrical; if the judgment is positive, the spool valve is considered asymmetrical.

6. The equipment fault monitoring method for an energy station according to claim 1, characterized in that, The operating grading conditions include the shortest continuous power-on time, the safe travel range, and the shortest travel length; Based on the operational grading conditions, and according to the stable operation data of the spool valve, the hot-grade energizing event and the cold-grade energizing event of the spool valve are set, including: 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; A continuous energizing event 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 is set as a candidate energizing event. The hot-side energizing event and the cold-side energizing event of the slide valve are set according to the alternative energizing events.

7. The equipment fault monitoring method for an energy station according to claim 6, characterized in that, The operating grading conditions also include cold grading boundary temperature, hot grading boundary temperature, and boundary temperature margin. Based on the candidate energizing events, the hot-side energizing event and the cold-side energizing event of the slide valve are set, including: The alternative energizing event corresponding to the initial oil temperature that is less than or equal to the cold setting temperature is set as the spool valve cold setting energizing event, wherein the cold setting temperature is the value of the cold setting boundary temperature minus the boundary temperature margin. The alternative energizing event corresponding to the initial oil temperature that is greater than or equal to the hot setting temperature is set as the spool valve hot setting energizing event, wherein the hot setting temperature is the sum of the hot setting boundary temperature and the boundary temperature margin.

8. An equipment fault monitoring system for an energy station, characterized in that, The system employs the equipment fault monitoring method for energy station buildings according to any one of claims 1-7, and the system comprises: The power-on event filtering module is used to acquire the operation monitoring data of the screw chiller unit in the energy station, and set the hot-side power-on event and cold-side power-on event of the slide valve based on the stability condition of the slide valve and the operation monitoring data. The energizing stroke generation module is used to generate a hot-side energizing stroke rate based on the hot-side energizing event of the slide valve, and to generate a cold-side energizing stroke rate based on the cold-side energizing event of the slide valve. Anomaly generation module is used to count the number of stroke rate anomalies where the hot section energizing stroke rate is less than or equal to the cold section energizing stroke rate. The fault alarm judgment module is used to determine whether the number of abnormal stroke rates is greater than or equal to the abnormal number threshold. If the determination is yes, a slide valve fault alarm is generated.

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