Automatic liquid supplementing system for mechanical seal

Abstract

The invention provides an automatic liquid supplementing system for a mechanical seal, and relates to the technical field of mechanical seals, the automatic liquid supplementing system comprises an equipment assembly and a control system, the equipment assembly comprises a flushing tank and a mechanical seal, flushing liquid is arranged in the flushing tank, the lower portion of the flushing tank is connected with a liquid inlet pipe, and the liquid inlet pipe is connected with an inlet of the mechanical seal; the upper part of the flushing tank is connected with a liquid outlet pipe, the liquid outlet pipe is connected with an outlet of the mechanical seal, the liquid outlet pipe is connected with a liquid supplementing nozzle, the liquid supplementing nozzle is connected with liquid supplementing equipment, and the lower part of the liquid inlet pipe is connected with a liquid discharging nozzle; the control system comprises an automatic liquid supplementing unit and a loss calculating unit; the flushing tank is used for containing flushing liquid, the flushing liquid is communicated with the mechanical seal in cooperation with the liquid inlet pipe and the liquid outlet pipe, the flushing liquid is circulated, in the process, the liquid level in the flushing tank is collected at equal time intervals through the automatic liquid supplementing unit, when the liquid level is lower than a set threshold value, the liquid supplementing nozzle and the liquid supplementing equipment are connected to conduct flushing liquid supplementing operation, and automatic liquid supplementing is achieved; the operation is more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical seals, and in particular to an automatic liquid replenishing system for mechanical seals. Background Art

[0002] Mechanical seal is a shaft sealing device used in rotating fluid machinery, also known as end face seal. It mainly consists of at least one pair of end faces perpendicular to the axis of rotation, which are kept in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, as well as the cooperation of auxiliary seals, thereby forming a device to prevent fluid leakage. This sealing method is commonly used in rotary fluid machinery such as pumps, compressors, reaction stirring kettles, as well as gearboxes, ship tail shafts and other equipment. Mechanical seals have the advantages of reliable structure, low leakage, long life, and no need for adjustment during operation, and are widely used in various industrial fields;

[0003] During operation, the mechanical seal needs to be flushed with flushing liquid for circulating flushing. Flushing can prevent the formation of air pockets, maintain the fit of the sealing surface, take away frictional heat, prevent the sealing surface from overheating, change the pressure of the sealing chamber, prevent the medium from vaporizing or crystallizing, and keep the sealing surface clean. However, during the circulating flushing, there is a problem of flushing liquid loss. In the prior art, a liquid level sensor is generally used to sense the liquid level of the flushing liquid in the flushing liquid tank. When the loss reaches a certain threshold, manual liquid addition is performed, which is very troublesome. In addition, when there is an abnormality in the mechanical seal, causing the flushing liquid to leak, as long as the leakage amount does not increase significantly, it cannot be detected in time by the naked eye when adding liquid manually, which poses a hidden danger and affects the normal operation of the seal and the equipment. Therefore, the present invention proposes an automatic liquid replenishing system for mechanical seals to solve the problems existing in the prior art. Summary of the invention

[0004] In view of the above problems, the present invention proposes an automatic liquid replenishing system for mechanical seals. When the liquid level is lower than the set threshold, the automatic liquid replenishing system for mechanical seals connects the liquid replenishing nozzle and the liquid replenishing equipment to perform the flushing liquid replenishing operation, which is automated and more convenient.

[0005] To achieve the purpose of the present invention, the present invention is implemented through the following technical solutions: an automatic liquid replenishing system for a mechanical seal, comprising an equipment component and a control system, the equipment component comprising a flushing tank and a mechanical seal, the flushing tank having flushing liquid built therein, and a liquid inlet pipe connected to the bottom of the flushing tank, and the liquid inlet pipe connected to the inlet of the mechanical seal, a liquid outlet pipe connected to the top of the flushing tank, and the liquid outlet pipe connected to the outlet of the mechanical seal, a liquid replenishing nozzle connected to the liquid outlet pipe, and the liquid replenishing nozzle connected to the liquid replenishing device, and a liquid discharge nozzle connected to the bottom of the liquid inlet pipe;

[0006] The control system includes an automatic refilling unit, a loss calculation unit and an early warning unit. The automatic refilling unit is used to collect the liquid level in the flushing tank at equal time intervals. When the liquid level is lower than the set threshold, the refilling nozzle and the refilling device are connected to perform the refilling operation of the flushing liquid. The loss calculation unit is used to calculate the ratio of the time interval between each refilling operation and the amount of flushing liquid loss under normal operation, and establish a standard loss model in combination with the current environmental parameters. The early warning unit uses the standard loss model as a benchmark, and in each subsequent refilling operation, determines whether there is an abnormality in the time interval and loss ratio of the refilling, and issues an alarm reminder when an abnormality occurs.

[0007] A further improvement is that a first valve is provided on the liquid replenishing nozzle, and a second valve is provided on the liquid discharging nozzle.

[0008] A further improvement is that a pressure pump is provided on the liquid inlet pipe, and the pressure of the pressure pump is kept constant.

[0009] A further improvement is that a liquid level sensor is provided inside the flushing tank, and the liquid level sensor is used to identify the liquid level of the flushing liquid inside the flushing tank.

[0010] A further improvement is that a cooling coil is arranged around the outside of the flushing tank, and a heat exchange liquid outlet is arranged at the upper end of the cooling coil, a heat exchange liquid inlet is arranged at the lower end of the cooling coil, and heat exchange liquid flows through the inside of the cooling coil.

[0011] Further improvements are: the automatic liquid replenishment unit, loss calculation unit and early warning unit are based on the computer of the control terminal, the automatic liquid replenishment unit includes a data acquisition module, a human-computer interaction module and an analysis execution unit, the data acquisition module is used to collect data from the liquid level sensor, and the data acquisition module has a built-in timing unit, the timing unit is used to manually set the time interval, control the data acquisition module to collect data regularly and store it, the human-computer interaction module is used to manually set the standard liquid level threshold in the flushing tank and the liquid level threshold that triggers liquid replenishment, the analysis execution unit is used to compare the data collected in real time by the data acquisition module and the liquid level threshold that triggers liquid replenishment, when the real-time collected data reaches the liquid level threshold that triggers liquid replenishment, the first valve is opened, the liquid replenishment nozzle and the liquid replenishment equipment are connected, and liquid is added to the flushing tank to the standard liquid level threshold.

[0012] A further improvement is that the loss calculation unit includes a model building module and an ambient temperature compensation module. The model building module is used to collect the time interval when the standard liquid level threshold in the flushing tank reaches the liquid level threshold that triggers liquid replenishment under N processes during the normal operation of the overall system, calculate the loss efficiency of the flushing liquid in the flushing tank under N processes, take the range value, and construct a standard loss model.

[0013] A further improvement is that the ambient temperature compensation module is used to record the environmental parameters under each process, analyze the impact of temperature and humidity on loss efficiency under different environments, and calculate vector data values.

[0014] A further improvement is that the early warning unit includes an algorithm module and an early warning sending module, the algorithm module is used to access the data of the data acquisition module and the analysis execution unit in real time, take each fluid replenishment operation as a process point, calculate the time interval between the process point and the previous process point, and thus calculate the flushing fluid loss efficiency under the time interval, and use the vector data value to compensate for the loss efficiency value based on the environmental parameters of the time interval, then compare the calculated flushing fluid loss efficiency with the standard loss model to determine whether there is an abnormality.

[0015] A further improvement is that the warning sending module is used to send abnormal data and time parameters to the display of the computer of the control terminal when an abnormality occurs, and simultaneously use wireless communication to send the abnormal data and time parameters to the mobile phone APP of the manager.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention contains flushing liquid in a flushing tank, and cooperates with a liquid inlet pipe, a liquid outlet pipe and a mechanical seal to circulate the flushing liquid. During this process, the liquid level in the flushing tank is collected at time intervals through an automatic liquid replenishing unit. When the liquid level is lower than a set threshold, the liquid replenishing nozzle and the liquid replenishing device are connected to perform the flushing liquid replenishing operation, which is automated and more convenient.

[0018] 2. The present invention collects the time intervals when the standard liquid level threshold in the flushing tank reaches the liquid level threshold that triggers fluid replenishment in multiple processes during the normal operation of the overall system, calculates the range of loss efficiency of the flushing liquid in the flushing tank, and constructs a standard loss model. Based on this, the standard loss model is used as a benchmark. In each subsequent fluid replenishment operation, it is determined whether there are abnormalities in the time interval and loss ratio of fluid replenishment, and an alarm is issued in case of abnormalities, so as to facilitate timely detection of hidden dangers.

[0019] 3. The present invention records the environmental parameters under each process, analyzes the impact of temperature and humidity on the loss efficiency under different environments, and calculates the vector data value. When calculating the loss efficiency of the flushing liquid, the vector data value is used to compensate for the loss efficiency value based on the environmental parameters of the time interval, so that the abnormality judgment is more accurate.

[0020] 4. The present invention winds a cooling coil outside the flushing tank and connects the heat exchange liquid, so as to facilitate heat exchange cooling of the flushing liquid in the flushing tank, improve the cooling effect on the mechanical seal, and diversify the functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of a control system of the present invention;

[0022] Figure 2 It is a schematic diagram of the equipment components of the present invention.

[0023] Among them: 1. Flushing tank; 2. Mechanical seal; 3. Liquid inlet pipe; 4. Liquid outlet pipe; 5. Liquid replenishment nozzle; 6. Liquid discharge nozzle; 7. First valve; 8. Second valve; 9. Pressure pump; 10. Cooling coil; 11. Heat exchange liquid outlet; 12. Heat exchange liquid inlet. DETAILED DESCRIPTION

[0024] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0025] Embodiment 1

[0026] according to Figure 1 , 2 As shown, this embodiment proposes an automatic liquid replenishing system for a mechanical seal, including an equipment component and a control system, wherein the equipment component includes a flushing tank 1 and a mechanical seal 2, wherein the flushing tank 1 has a flushing liquid built therein, and a liquid inlet pipe 3 is connected to the bottom of the flushing tank 1, and the liquid inlet pipe 3 is connected to the inlet of the mechanical seal 2, a liquid outlet pipe 4 is connected to the top of the flushing tank 1, and the liquid outlet pipe 4 is connected to the outlet of the mechanical seal 2, a liquid replenishing nozzle 5 is connected to the liquid outlet pipe 4, and the liquid replenishing nozzle 5 is connected to the liquid replenishing device, and a liquid discharge nozzle 6 is connected to the bottom of the liquid inlet pipe 3;

[0027] The control system includes an automatic refilling unit, a loss calculation unit and an early warning unit. The automatic refilling unit is used to collect the liquid level in the flushing tank 1 at equal time intervals. When the liquid level is lower than the set threshold, the refilling nozzle 5 and the refilling device are connected to perform the refilling operation of the flushing liquid. The loss calculation unit is used to calculate the ratio of the time interval between each refilling operation and the amount of flushing liquid loss under normal operation, and establish a standard loss model in combination with the current environmental parameters. The early warning unit uses the standard loss model as a benchmark, and in each subsequent refilling operation, determines whether there is an abnormality in the time interval and loss ratio of the refilling, and issues an alarm reminder when an abnormality occurs. When in use, the flushing liquid is contained in the flushing tank 1, and the liquid inlet pipe 3 and the liquid outlet pipe 4 are connected to the mechanical seal 2 to circulate the flushing liquid. In this process, the liquid level in the flushing tank 1 is collected at time intervals by the automatic refilling unit. When the liquid level is lower than the set threshold, the refilling nozzle 5 and the refilling equipment are connected to perform the flushing liquid refilling operation. The automated refilling is more convenient. By collecting the time intervals when the standard liquid level threshold in the flushing tank 1 reaches the liquid level threshold for triggering refilling in multiple processes during the normal operating conditions of the overall system, the range value of the loss efficiency of the flushing liquid in the flushing tank 1 is calculated, and a standard loss model is constructed. Based on the standard loss model, in each subsequent refilling operation, it is determined whether there is an abnormality in the loss efficiency of the flushing liquid (the ratio of the time interval between each refilling operation and the amount of flushing liquid loss is the loss efficiency). In case of an abnormality, an alarm is issued to facilitate timely detection of hidden dangers.

[0028] The refill nozzle 5 is provided with a first valve 7. When the liquid level is less than the set threshold, the first valve 7 is opened to connect the refill nozzle 5 and the refill device to perform the refilling operation of the flushing liquid. The discharge nozzle 6 is provided with a second valve 8. When not in use, the second valve 8 is opened to discharge the flushing liquid in the flushing tank 1 through the discharge nozzle 6.

[0029] The liquid inlet pipe 3 is provided with a pressure pump 9, and the pressure of the pressure pump 9 is kept constant. When in use, the flushing liquid is contained in the flushing tank 1, and the liquid inlet pipe 3, the liquid outlet pipe 4 are connected with the mechanical seal 2, and the pressure of the pressure pump 9 is used to circulate the flushing liquid.

[0030] A liquid level sensor is provided inside the flushing tank 1, and the liquid level sensor is used to identify the liquid level of the flushing liquid inside the flushing tank 1. When in use, the flushing liquid is contained in the flushing tank 1, and the liquid inlet pipe 3 and the liquid outlet pipe 4 are connected with the mechanical seal 2 to circulate the flushing liquid. In this process, the data of the liquid level sensor is collected at equal time intervals through the automatic liquid replenishment unit to obtain the liquid level in the flushing tank 1. When the liquid level is less than the set threshold, the liquid replenishment nozzle 5 and the liquid replenishment device are connected to perform the flushing liquid replenishment operation, which is more convenient for automatic liquid replenishment.

[0031] The outer side of the flushing tank 1 is surrounded by a cooling coil 10, and the upper end of the cooling coil 10 is provided with a heat exchange liquid outlet 11, and the lower end of the cooling coil 10 is provided with a heat exchange liquid inlet 12, and the heat exchange liquid flows through the cooling coil 10. The cooling coil 10 is wound around the flushing tank 1 and connected to the heat exchange liquid, which facilitates heat exchange cooling of the flushing liquid in the flushing tank 1, improves the cooling effect on the mechanical seal 2, and has diversified functions.

[0032] Embodiment 2

[0033] according to Figure 1 , 2 As shown, this embodiment proposes an automatic liquid replenishing system for a mechanical seal, including an equipment component and a control system, wherein the equipment component includes a flushing tank 1 and a mechanical seal 2, wherein the flushing tank 1 has a flushing liquid built therein, and a liquid inlet pipe 3 is connected to the bottom of the flushing tank 1, and the liquid inlet pipe 3 is connected to the inlet of the mechanical seal 2, a liquid outlet pipe 4 is connected to the top of the flushing tank 1, and the liquid outlet pipe 4 is connected to the outlet of the mechanical seal 2, a liquid replenishing nozzle 5 is connected to the liquid outlet pipe 4, and the liquid replenishing nozzle 5 is connected to the liquid replenishing device, and a liquid discharge nozzle 6 is connected to the bottom of the liquid inlet pipe 3;

[0034] The control system includes an automatic refilling unit, a loss calculation unit and an early warning unit. The automatic refilling unit is used to collect the liquid level in the flushing tank 1 at equal time intervals. When the liquid level is lower than the set threshold, the refilling nozzle 5 and the refilling device are connected to perform the refilling operation of the flushing liquid. The loss calculation unit is used to calculate the ratio of the time interval between each refilling operation and the amount of flushing liquid loss under normal operation, and establish a standard loss model in combination with the current environmental parameters. The early warning unit uses the standard loss model as a benchmark, and in each subsequent refilling operation, determines whether there is an abnormality in the time interval and loss ratio of the refilling, and issues an alarm reminder when an abnormality occurs. When in use, the flushing liquid is contained in the flushing tank 1, and the liquid inlet pipe 3 and the liquid outlet pipe 4 are connected to the mechanical seal 2 to circulate the flushing liquid. In this process, the liquid level in the flushing tank 1 is collected at time intervals by the automatic refilling unit. When the liquid level is lower than the set threshold, the refilling nozzle 5 and the refilling equipment are connected to perform the flushing liquid refilling operation. The automated refilling is more convenient. By collecting the time intervals when the standard liquid level threshold in the flushing tank 1 reaches the liquid level threshold for triggering refilling in multiple processes during the normal operating conditions of the overall system, the range value of the loss efficiency of the flushing liquid in the flushing tank 1 is calculated, and a standard loss model is constructed. Based on the standard loss model, in each subsequent refilling operation, it is determined whether there is an abnormality in the loss efficiency of the flushing liquid (the ratio of the time interval between each refilling operation and the amount of flushing liquid loss is the loss efficiency). In case of an abnormality, an alarm is issued to facilitate timely detection of hidden dangers.

[0035] The automatic refilling unit, loss calculation unit and early warning unit are based on the computer of the control terminal. The automatic refilling unit includes a data acquisition module, a human-computer interaction module and an analysis execution unit. The data acquisition module is used to collect data from the liquid level sensor, and the data acquisition module has a built-in timing unit. The timing unit is used to manually set the time interval, control the data acquisition module to collect data regularly and store it, and the human-computer interaction module is used to manually set the standard liquid level threshold in the flushing tank 1 and the liquid level threshold that triggers refilling. The analysis execution unit is used to compare the data collected in real time by the data acquisition module and the liquid level threshold that triggers refilling. When the real-time collected data reaches the liquid level threshold that triggers refilling, the first valve 7 is opened, the refilling nozzle 5 and the refilling device are connected, and the refilling tank 1 is filled with liquid to the standard liquid level threshold. Automated refilling is more convenient.

[0036] The loss calculation unit includes a model building module and an ambient temperature compensation module. The model building module is used to collect the time interval when the standard liquid level threshold in the flushing tank 1 reaches the liquid level threshold that triggers liquid replenishment under N processes in the normal operation of the overall system, calculate the loss efficiency of the flushing liquid in the flushing tank 1 under N processes, take the range value, and build a standard loss model. When the overall system is in a normal operation state, the data of N complete processes are continuously or periodically collected. In each process, the change of the liquid level in the flushing tank 1 is paid attention to, especially the time interval from the standard liquid level threshold to the liquid level threshold that triggers automatic liquid replenishment. For each collected process data, the loss efficiency of the flushing liquid in the flushing tank 1 is calculated. It is completed by comparing the difference between the initial liquid level and the liquid level when the liquid replenishment is triggered, and combining the total duration of the process. The loss efficiency is expressed by the speed or percentage of the liquid level drop per unit time. Based on the loss efficiency calculation results under N processes, the distribution characteristics of these data are further analyzed, including statistical parameters such as the average value, maximum value, and minimum value. Then, a range value is selected from these statistical parameters, including the average value ± standard deviation, to build a standard loss model representing the standard loss of the system. This model reflects the average loss level and its fluctuation range of the system under normal operating conditions.

[0037] The environmental temperature compensation module is used to record the environmental parameters under each process, analyze the impact of temperature and humidity on the loss efficiency under different environments, and calculate the vector data value. The environmental parameters under each process, including temperature and humidity, are collected in real time and accurately. The collected environmental data is input into the data analysis algorithm, and based on historical data and experimental research results, the specific impact on the loss efficiency of the flushing fluid under different temperature and humidity conditions is analyzed, including identifying which temperature ranges or humidity conditions will cause an increase or decrease in the loss efficiency, as well as the degree and trend of these impacts. Through data analysis, the environmental temperature compensation module calculates vector data values ​​that can reflect the impact of the environment on the loss efficiency. These vector data values ​​include temperature coefficients and humidity factors, which are used to adjust the parameters in the standard loss model to reflect the actual loss situation under the current environmental conditions. According to the calculated vector data values, the relevant parameters in the standard loss model are adjusted dynamically, and the adjustment is carried out in real time as the environmental conditions change in real time. In this way, the loss of flushing fluid can be more accurately predicted and calculated, thereby ensuring the timeliness and accuracy of the rehydration operation.

[0038] The early warning unit includes an algorithm module and an early warning sending module. The algorithm module is used to access the data of the data acquisition module and the analysis execution unit in real time. Each fluid replenishment operation is regarded as a process point, and the time interval between the process point and the previous process point is calculated, thereby calculating the flushing liquid loss efficiency in the time interval, and according to the environmental parameters of the time interval, the vector data value is used to compensate the value of the loss efficiency. Then, the calculated flushing liquid loss efficiency is compared with the standard loss model to determine whether there is an abnormality. Real-time access to the data of the data acquisition module and the analysis execution unit, each fluid replenishment operation is regarded as a process point, and the algorithm module calculates the time interval between the current process point and the previous process point. Based on the time interval, the algorithm module calculates the flushing liquid loss efficiency in the time interval. This calculation process involves a comprehensive analysis of the flushing liquid usage and the time interval, and also compensates the value of the loss efficiency based on the environmental parameters (temperature, humidity) within the time interval using the vector data value calculated by the environmental temperature compensation module. To ensure that the calculation of the loss efficiency can accurately reflect the actual situation under the current environmental conditions, the calculated flushing fluid loss efficiency is compared with the standard loss model. If the calculated loss efficiency deviates from the standard model to a certain extent (i.e. exceeds the preset threshold range), it is judged that an abnormal situation exists.

[0039] The warning sending module is used to send abnormal data and time parameters to the display of the computer of the control terminal when an abnormality occurs, and simultaneously use wireless communication to send abnormal data and time parameters to the mobile phone APP of the manager. Multiple remote alarm methods ensure that the manager knows the time and performs maintenance.

[0040] The automatic refilling system for mechanical seal contains the flushing liquid through the flushing tank 1, and is connected with the mechanical seal 2 by the liquid inlet pipe 3 and the liquid outlet pipe 4 to circulate the flushing liquid. In this process, the liquid level in the flushing tank 1 is collected at equal time intervals by the automatic refilling unit. When the liquid level is less than the set threshold, the refilling nozzle 5 and the refilling device are connected to perform the refilling operation of the flushing liquid, and the automatic refilling is more convenient. In addition, by collecting the time intervals when the standard liquid level threshold in the flushing tank 1 reaches the liquid level threshold that triggers the refilling in multiple processes during the normal operation of the overall system, the range value of the loss efficiency of the flushing liquid in the flushing tank 1 is calculated, and a standard loss model is constructed. Based on the standard loss model, in each subsequent refilling operation, it is judged whether the time interval and loss ratio of the refilling are abnormal, and an alarm is issued when it is abnormal, so as to facilitate and timely troubleshooting of hidden dangers. At the same time, the present invention records the environmental parameters under each process, analyzes the influence of temperature and humidity on the loss efficiency under different environments, and calculates the vector data value. When calculating the loss efficiency of the flushing liquid, according to the environmental parameters of the time interval, the vector data value is used to compensate the value of the loss efficiency, so that the abnormal judgment is more accurate. In addition, the present invention winds a cooling coil 10 outside the flushing tank 1 and connects the heat exchange liquid to facilitate heat exchange cooling of the flushing liquid in the flushing tank 1, thereby improving the cooling effect on the mechanical seal 2 and diversifying the functions.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic liquid replenishing system for mechanical seal, comprising equipment components and a control system, characterized in that: The equipment assembly comprises a flushing tank (1) and a mechanical seal (2), wherein the flushing tank (1) contains flushing liquid, and a liquid inlet pipe (3) is connected to the bottom of the flushing tank (1), and the liquid inlet pipe (3) is connected to the inlet of the mechanical seal (2), a liquid outlet pipe (4) is connected to the top of the flushing tank (1), and the liquid outlet pipe (4) is connected to the outlet of the mechanical seal (2), a liquid replenishment nozzle (5) is connected to the liquid outlet pipe (4), and the liquid replenishment nozzle (5) is connected to the liquid replenishment device, and a liquid discharge nozzle (6) is connected to the bottom of the liquid inlet pipe (3); The control system comprises an automatic liquid replenishment unit, a loss calculation unit and an early warning unit. The automatic liquid replenishment unit is used to collect the liquid level in the flushing tank (1) at equal time intervals. When the liquid level is less than a set threshold, the liquid replenishment nozzle (5) and the liquid replenishment device are connected to perform a flushing liquid replenishment operation. The loss calculation unit is used to calculate the ratio of the time interval between each liquid replenishment operation and the flushing liquid loss amount under normal operation, and establish a standard loss model in combination with current environmental parameters. The early warning unit uses the standard loss model as a reference to determine whether the liquid replenishment time interval and the loss ratio are abnormal during each subsequent liquid replenishment operation, and issues an alarm reminder when an abnormality occurs.

2. The automatic liquid replenishing system for mechanical seal according to claim 1, characterized in that: The liquid replenishing nozzle (5) is provided with a first valve (7), and the liquid discharging nozzle (6) is provided with a second valve (8).

3. The automatic liquid replenishing system for mechanical seal according to claim 1, characterized in that: The liquid inlet pipe (3) is provided with a pressure pump (9), and the pressure of the pressure pump (9) is kept constant.

4. The automatic liquid replenishing system for mechanical seal according to claim 2, characterized in that: A liquid level sensor is provided inside the flushing tank (1), and the liquid level sensor is used to identify the liquid level of the flushing liquid inside the flushing tank (1).

5. The automatic liquid replenishing system for mechanical seal according to claim 1, characterized in that: A cooling coil (10) is arranged around the outside of the flushing tank (1), and a heat exchange liquid outlet (11) is arranged at the upper end of the cooling coil (10), and a heat exchange liquid inlet (12) is arranged at the lower end of the cooling coil (10), and heat exchange liquid flows through the interior of the cooling coil (10).

6. The automatic liquid replenishing system for mechanical seal according to claim 4, characterized in that: The automatic liquid replenishment unit, the loss calculation unit and the early warning unit are based on a computer of a control terminal. The automatic liquid replenishment unit comprises a data acquisition module, a human-computer interaction module and an analysis execution unit. The data acquisition module is used to collect data from a liquid level sensor, and the data acquisition module has a built-in timing unit. The timing unit is used to manually set a time interval, control the data acquisition module to collect data regularly and store data. The human-computer interaction module is used to manually set a standard liquid level threshold in the flushing tank (1) and a liquid level threshold for triggering liquid replenishment. The analysis execution unit is used to compare the data collected in real time by the data acquisition module and the liquid level threshold for triggering liquid replenishment. When the data collected in real time reaches the liquid level threshold for triggering liquid replenishment, the first valve (7) is opened, the liquid replenishment nozzle (5) and the liquid replenishment device are connected, and liquid is added to the flushing tank (1) to the standard liquid level threshold.

7. The automatic liquid replenishing system for mechanical seal according to claim 6, characterized in that: The loss calculation unit comprises a model building module and an ambient temperature compensation module. The model building module is used to collect the time interval when the standard liquid level threshold in the flushing tank (1) reaches the liquid level threshold for triggering liquid replenishment under N processes in the normal operating condition of the overall system, calculate the loss efficiency of the flushing liquid in the flushing tank (1) under the N processes, take a range value, and construct a standard loss model.

8. The automatic liquid replenishing system for mechanical seal according to claim 7, characterized in that: The environmental temperature compensation module is used to record the environmental parameters under each process, analyze the impact of temperature and humidity on loss efficiency under different environments, and calculate vector data values.

9. The automatic liquid replenishing system for mechanical seal according to claim 8, characterized in that: The early warning unit includes an algorithm module and an early warning sending module. The algorithm module is used to access the data of the data acquisition module and the analysis execution unit in real time, and take each fluid replenishment operation as a process point. The time interval between the process point and the previous process point is calculated, thereby calculating the flushing fluid loss efficiency under the time interval, and according to the environmental parameters of the time interval, the vector data value is used to compensate the value of the loss efficiency. Then, the calculated flushing fluid loss efficiency is compared with the standard loss model to determine whether there is an abnormality.

10. The automatic liquid replenishing system for mechanical seal according to claim 9, characterized in that: The warning sending module is used to send abnormal data and time parameters to the display of the computer of the control terminal when an abnormality occurs, and simultaneously use wireless communication to send the abnormal data and time parameters to the mobile phone APP of the manager.

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