A method of purging a mechanical seal cavity and associated apparatus

Abstract

This application discloses a flushing method and related apparatus for a mechanical seal cavity, relating to the field of mechanical seal technology. The flushing method is applied to a controller deployed within the mechanical seal cavity. A gauge pressure sensor, a medium concentration sensor, and a flow sensor are all located at the outlet end of the mechanical seal cavity; a torque sensor is located on the corresponding drive shaft of the mechanical seal cavity; the outlet end of a variable frequency flushing pump is connected to the inlet end of the mechanical seal cavity, and a flow regulating valve is located on the connecting pipeline between the outlet end of the variable frequency flushing pump and the inlet end of the mechanical seal cavity. The flushing method adjusts the variable frequency flushing pump and the flow regulating valve based on the gauge pressure value of the mechanical seal cavity sent by the gauge pressure sensor, the medium concentration value of the mechanical seal cavity sent by the medium concentration sensor, the torque value of the drive shaft sent by the torque sensor, and the flow rate value of the variable frequency flushing pump sent by the flow sensor, thereby flushing the mechanical seal cavity. This improves the targeting and timeliness of the mechanical seal cavity flushing.

Description

Technical Field

[0001] This application relates to the field of mechanical seal technology, and in particular to a flushing method and related apparatus for a mechanical seal cavity. Background Technology

[0002] In industrial settings where wastewater, sludge, and evaporated / crystallized materials containing particulate matter are transported, mechanical seals, as core sealing components in fluid transport equipment such as centrifugal pumps and screw pumps, directly determine the safety and production continuity of the equipment. Because the media contains a large number of hard particles, mechanical seals are prone to blockage due to particle deposition on the sealing surface, or leakage due to long-term wear of the sealing surface. Therefore, it is necessary to flush the mechanical seal cavity.

[0003] Currently, leakage in the mechanical seal cavity is typically detected using a gauge pressure sensor, and blockage is detected using a torque sensor. Intervention is then performed manually based on the leakage and blockage status of the mechanical seal cavity.

[0004] However, under complex particulate media conditions, instantaneous particle adhesion may cause pressure signal distortion, and changes in media viscosity may also cause torque fluctuations, making the detection of leaks and blockages inaccurate. Furthermore, manual intervention affects the continuous operation efficiency of the production line, resulting in poor targeting and timeliness of mechanical seal cavity flushing. Summary of the Invention

[0005] In view of the above problems, this application provides a flushing method and related apparatus for mechanical seal cavities to improve the targeting and timeliness of flushing. The specific solution is as follows:

[0006] This application provides a flushing method for a mechanical seal cavity, applied to a controller deployed in the mechanical seal cavity. The mechanical seal cavity is further equipped with a gauge pressure sensor, a medium concentration sensor, a torque sensor, a flow sensor, a variable frequency flushing pump, and a flow regulating valve. The gauge pressure sensor, the medium concentration sensor, and the flow sensor are all disposed at the outlet end of the mechanical seal cavity. The torque sensor is disposed on a drive shaft corresponding to the mechanical seal cavity. The outlet end of the variable frequency flushing pump is connected to the inlet end of the mechanical seal cavity. The flow regulating valve is disposed on a connecting pipeline between the outlet end of the variable frequency flushing pump and the inlet end of the mechanical seal cavity. The controller is electrically connected to the gauge pressure sensor, the medium concentration sensor, the torque sensor, the flow sensor, the variable frequency flushing pump, and the flow regulating valve, respectively. The flushing method includes:

[0007] The instrument obtains the gauge pressure value of the mechanical seal cavity detected by the gauge pressure sensor, the medium concentration value of the mechanical seal cavity detected by the medium concentration sensor, the torque value of the drive shaft detected by the torque sensor, and the flow rate value of the variable frequency flushing pump detected by the flow sensor.

[0008] Based on the gauge pressure value and the medium concentration value of the mechanical seal cavity, the leakage degree value of the mechanical seal cavity is calculated, and based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump, the blockage degree value of the mechanical seal cavity is calculated.

[0009] The fault level of the mechanical seal cavity is determined based on the leakage level and the blockage level of the mechanical seal cavity.

[0010] The variable frequency flushing pump and the flow regulating valve are adjusted based on the fault level of the mechanical seal cavity to flush the mechanical seal cavity.

[0011] In one possible implementation, the calculation of the leakage degree value of the mechanical seal cavity based on the gauge pressure value and the medium concentration value of the mechanical seal cavity, and the calculation of the blockage degree value of the mechanical seal cavity based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump, includes:

[0012] The gauge pressure value and the medium concentration value of the mechanical seal cavity are dimensionlessly processed to obtain the gauge pressure characteristic value and the medium concentration characteristic value of the mechanical seal cavity.

[0013] The leakage degree value of the mechanical seal cavity is obtained by weighting the gauge pressure characteristic value and the medium concentration characteristic value of the mechanical seal cavity.

[0014] The torque value of the drive shaft and the flow rate value of the variable frequency flushing pump are dimensionless to obtain the torque characteristic value of the drive shaft and the flow rate characteristic value of the variable frequency flushing pump.

[0015] Based on the torque characteristic value of the drive shaft, the flow characteristic value of the variable frequency flushing pump, and the preset blockage weighting coefficient, the blockage degree value of the mechanical seal cavity is calculated.

[0016] In one possible implementation, determining the fault level of the mechanical seal cavity based on the leakage level value and the blockage level value of the mechanical seal cavity includes:

[0017] If the leakage level of the mechanical seal cavity is within a first preset leakage level range and the blockage level of the mechanical seal cavity is within a first preset blockage level range, then the fault level of the mechanical seal cavity is determined to be the first fault level. The first preset leakage level range is a range greater than the first preset leakage level value and not greater than the second preset leakage level value, and the first preset blockage level range is a range greater than the first preset blockage level value and not greater than the second preset blockage level value.

[0018] If the leakage level of the mechanical seal cavity is within a first preset leakage level range and the blockage level of the mechanical seal cavity is within a second preset blockage level range, or if the leakage level of the mechanical seal cavity is within a second preset leakage level range and the blockage level of the mechanical seal cavity is not within a third preset blockage level range, then the fault level of the mechanical seal cavity is determined to be the second fault level. The second preset leakage level range is a range greater than the second preset leakage level value and not greater than the third preset leakage level value, and the second preset blockage level range is a range greater than the second preset blockage level value and not greater than the third preset blockage level value.

[0019] If the leakage level of the mechanical seal cavity does not fall within the third preset leakage level range and the blockage level of the mechanical seal cavity falls within the third preset blockage level range, or if the leakage level of the mechanical seal cavity falls within the second preset leakage level range and the blockage level of the mechanical seal cavity does not fall within the third preset blockage level range, then the fault level of the mechanical seal cavity is determined to be the third fault level. The third preset leakage level range is a range greater than the third preset leakage level value and not greater than the fourth preset leakage level value, and the third preset blockage level range is a range greater than the third preset blockage level value and not greater than the fourth preset blockage level value.

[0020] If the leakage level of the mechanical seal cavity falls within the third preset leakage level range and the blockage level of the mechanical seal cavity falls within the third preset blockage level range, then the fault level of the mechanical seal cavity is determined to be the fourth fault level.

[0021] In one possible implementation, adjusting the variable frequency flushing pump and the flow regulating valve based on the fault level of the mechanical seal cavity includes:

[0022] When the fault level of the mechanical seal cavity is the first fault level, the frequency of the variable frequency flushing pump and the opening of the flow regulating valve are kept constant.

[0023] When the fault level of the mechanical seal cavity is the second fault level, the frequency of the variable frequency flushing pump is adjusted to the first preset frequency, and the opening of the flow regulating valve is adjusted to the first preset opening.

[0024] When the fault level of the mechanical seal cavity is the third fault level, the frequency of the variable frequency flushing pump is adjusted to the second preset frequency, and the opening of the flow regulating valve is adjusted to the second preset opening. The second preset frequency is greater than the first preset frequency, and the second preset opening is greater than the first preset opening.

[0025] When the fault level of the mechanical seal cavity is the fourth fault level, the frequency of the variable frequency flushing pump is adjusted to the third preset frequency, and the opening of the flow regulating valve is adjusted to the third preset opening. The third preset frequency is greater than the second preset frequency, and the third preset opening is greater than the second preset opening.

[0026] In one possible implementation, a motor speed controller and a motor circuit breaker are also deployed on the mechanical seal cavity; the motor speed controller is electrically connected to the drive motor corresponding to the mechanical seal cavity and the controller, respectively; the motor circuit breaker is electrically connected to the drive motor corresponding to the mechanical seal cavity and the controller, respectively.

[0027] The method further includes:

[0028] When the fault level of the mechanical seal cavity is the third fault level, the initial speed of the drive motor corresponding to the mechanical seal cavity is adjusted to a preset speed by the motor speed controller, and the initial speed is greater than the preset speed.

[0029] When the fault level of the mechanical seal cavity is the fourth fault level, the main power supply of the drive motor corresponding to the mechanical seal cavity is cut off by the motor circuit breaker.

[0030] In one possible implementation, after adjusting the variable frequency flushing pump and the flow control valve based on the fault level of the mechanical seal cavity to flush the mechanical seal cavity, the method further includes:

[0031] The instrument obtains the gauge pressure value of the mechanical seal cavity after flushing sent by the gauge pressure sensor, the medium concentration value of the mechanical seal cavity after flushing sent by the medium concentration sensor, the torque value of the drive shaft after flushing sent by the torque sensor, and the flow rate value of the variable frequency flushing pump after flushing sent by the flow sensor.

[0032] Based on the gauge pressure value and the medium concentration value of the mechanical seal cavity after flushing, the leakage degree value of the mechanical seal cavity after flushing is calculated, and based on the torque value of the drive shaft after flushing and the flow rate value of the variable frequency flushing pump after flushing, the blockage degree value of the mechanical seal cavity after flushing is calculated.

[0033] Based on the leakage degree value of the mechanical seal cavity, the blockage degree value of the mechanical seal cavity, the leakage degree value of the flushed mechanical seal cavity, and the blockage degree value of the flushed mechanical seal cavity, the first preset frequency, the second preset frequency, the third preset frequency, the first preset opening degree, the second preset opening degree, and the third preset opening degree are optimized.

[0034] A second aspect of this application provides a flushing device for a mechanical seal cavity, the flushing device being applied to the mechanical seal cavity; the mechanical seal cavity is further equipped with a gauge pressure sensor, a medium concentration sensor, a torque sensor, a flow sensor, a variable frequency flushing pump, and a flow regulating valve; the gauge pressure sensor, the medium concentration sensor, and the flow sensor are all disposed at the outlet end of the mechanical seal cavity; the torque sensor is disposed on the corresponding drive shaft of the mechanical seal cavity; the outlet end of the variable frequency flushing pump is connected to the inlet end of the mechanical seal cavity, and the flow regulating valve is disposed on the connecting pipeline between the outlet end of the variable frequency flushing pump and the inlet end of the mechanical seal cavity; the flushing device is electrically connected to the gauge pressure sensor, the medium concentration sensor, the torque sensor, the flow sensor, the variable frequency flushing pump, and the flow regulating valve respectively;

[0035] The flushing device includes:

[0036] The acquisition unit is used to acquire the gauge pressure value of the mechanical seal cavity detected by the gauge pressure sensor, the medium concentration value of the mechanical seal cavity detected by the medium concentration sensor, the torque value of the drive shaft detected by the torque sensor, and the flow rate value of the variable frequency flushing pump detected by the flow sensor.

[0037] The calculation unit is used to calculate the leakage degree value of the mechanical seal cavity based on the gauge pressure value and the medium concentration value of the mechanical seal cavity, and to calculate the blockage degree value of the mechanical seal cavity based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump.

[0038] The determining unit is used to determine the fault level of the mechanical seal cavity based on the leakage level value and the blockage level value of the mechanical seal cavity;

[0039] An adjustment unit is used to adjust the variable frequency flushing pump and the flow regulating valve based on the fault level of the mechanical seal cavity in order to flush the mechanical seal cavity.

[0040] In one possible implementation, the computing unit includes:

[0041] The first processing subunit is used to perform dimensionless processing on the gauge pressure value of the mechanical seal cavity and the medium concentration value of the mechanical seal cavity to obtain the gauge pressure characteristic value and the medium concentration characteristic value of the mechanical seal cavity.

[0042] The calculation subunit is used to perform a weighted calculation on the gauge pressure characteristic value of the mechanical seal cavity and the medium concentration characteristic value of the mechanical seal cavity to obtain the leakage degree value of the mechanical seal cavity;

[0043] The second processing subunit is used to perform dimensionless processing on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump to obtain the torque characteristic value of the drive shaft and the flow rate characteristic value of the variable frequency flushing pump.

[0044] The calculation subunit is used to calculate the degree of blockage of the mechanical seal cavity based on the torque characteristic value of the drive shaft, the flow characteristic value of the variable frequency flushing pump, and a preset blockage weighting coefficient.

[0045] A third aspect of this application provides a computer program product including computer-readable instructions that, when executed on an electronic device, cause the electronic device to implement the flushing method for the mechanical seal cavity described in the first aspect or any implementation thereof.

[0046] The fourth aspect of this application provides a computer storage medium carrying one or more computer programs, which, when executed by an electronic device, enable the electronic device to perform a flushing method for the mechanical seal cavity of the first aspect or any implementation thereof.

[0047] Based on the above technical solution, this application provides a flushing method and related apparatus for a mechanical seal cavity. This flushing method is applied to a controller deployed in the mechanical seal cavity, which also houses a gauge pressure sensor, a medium concentration sensor, a torque sensor, a flow sensor, a variable frequency flushing pump, and a flow regulating valve. The gauge pressure sensor, medium concentration sensor, and flow sensor are all located at the outlet end of the mechanical seal cavity; the torque sensor is located on the corresponding drive shaft of the mechanical seal cavity. This ensures that each sensor can directly collect key parameters reflecting the sealing state, providing a reliable data foundation for subsequent accurate diagnosis. The outlet end of the variable frequency flushing pump is connected to the inlet end of the mechanical seal cavity, and the flow regulating valve is located on the connecting pipeline between the outlet end of the variable frequency flushing pump and the inlet end of the mechanical seal cavity, ensuring that the variable frequency flushing pump can directly flush the mechanical seal cavity. The controller is electrically connected to a gauge pressure sensor, a medium concentration sensor, a torque sensor, a flow sensor, a variable frequency flushing pump, and a flow control valve. This flushing method acquires the gauge pressure value of the mechanical seal cavity from the gauge pressure sensor, the medium concentration value of the mechanical seal cavity from the medium concentration sensor, the torque value of the drive shaft from the torque sensor, and the flow rate value of the variable frequency flushing pump from the flow sensor. This effectively overcomes the deficiency of single parameters being easily interfered with under particulate media conditions. Based on the gauge pressure and medium concentration values ​​of the mechanical seal cavity, the leakage degree of the mechanical seal cavity is calculated, and based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump, the blockage degree of the mechanical seal cavity is calculated. Based on the leakage and blockage degrees of the mechanical seal cavity, the fault level of the mechanical seal cavity is determined. Based on the fault level of the mechanical seal cavity, the variable frequency flushing pump and the flow control valve are adjusted to flush the mechanical seal cavity. This grading mechanism enables automatic application of differentiated adjustment strategies for different degrees of fault. Therefore, this application improves the targeting and timeliness of mechanical seal cavity flushing. Attached Figure Description

[0048] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0049] Figure 1 A schematic diagram of the hardware structure of a mechanical seal cavity provided in an embodiment of this application;

[0050] Figure 2 This is a schematic flowchart of a flushing method for a mechanical seal cavity provided in an embodiment of this application.

[0051] Figure label:

[0052] 1-Gas pressure sensor; 2-Medium concentration sensor; 3-Torque sensor; 4-Flow sensor; 5-Variable frequency flushing pump; 6-Flow regulating valve; 7-Controller. Detailed Implementation

[0053] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0054] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0055] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0056] To improve the targeting and timeliness of flushing mechanical seal cavities, this application provides a flushing device for mechanical seal cavities, which is applied to mechanical seal cavities. The mechanical seal cavity provided in this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] Please see the appendix Figure 1 , Figure 1 This is a schematic diagram of the structure of a mechanical seal cavity provided in an embodiment of this application. The mechanical seal cavity may also be equipped with: a gauge pressure sensor 1 for sensing pressure status, a medium concentration sensor 2 for detecting changes in medium composition, a torque sensor 3 for measuring rotational resistance, a flow sensor 4 for monitoring fluid flow rate, a variable frequency flushing pump 5 for providing flushing power, a flow regulating valve 6 for adjusting the flushing flow rate, and a controller 7 as the control center, i.e., a flushing device for the mechanical seal cavity.

[0058] The pressure sensor 1, the medium concentration sensor 2, and the flow sensor 4 are all located at the outlet end of the mechanical seal cavity.

[0059] It should be noted that the gauge pressure sensor 1, the medium concentration sensor 2, and the flow sensor 4 are all installed at the outlet end of the mechanical seal cavity. The gauge pressure sensor 1 is used to detect the fluid pressure at the outlet of the mechanical seal cavity in real time. This pressure value directly reflects the pressure build-up inside the seal cavity. When the sealing surface is blocked, the fluid resistance increases, and the outlet pressure rises abnormally; when the seal fails and causes a large leak, the outlet pressure may drop sharply. The medium concentration sensor 2 is used to detect the concentration of the process medium in the flushing fluid flowing out of the seal cavity in real time. This is a key indicator for determining whether a leak has occurred. Once a small leak occurs at the sealing surface of the mechanical seal, the process medium will seep into the seal cavity and mix with the flushing fluid, causing an abnormal change in the medium concentration at the outlet. The flow sensor 4 is used to monitor the instantaneous flow rate of the flushing fluid at the outlet end of the seal cavity in real time. This parameter can be used to help determine the flow resistance inside the seal cavity (flow rate decreases when blocked) and also provides feedback for subsequent adjustment of the flushing intensity.

[0060] The torque sensor 3 is installed on the drive shaft corresponding to the mechanical seal cavity.

[0061] To directly sense the mechanical condition of the mechanical seal, torque sensor 3 is installed on the drive shaft corresponding to the mechanical seal cavity. Since the drive shaft is fixedly connected to the rotating ring of the mechanical seal, when the frictional resistance on the sealing surface increases due to particle deposition, the rotational torque borne by the drive shaft will increase accordingly. Therefore, the real-time torque value collected by torque sensor 3 can most directly and sensitively reflect the degree of blockage on the sealing surface and is the core parameter for judging blockage faults.

[0062] The outlet end of the variable frequency flushing pump 5 is connected to the inlet end of the mechanical seal cavity, and the flow regulating valve 6 is installed on the connecting pipeline between the outlet end of the variable frequency flushing pump 5 and the inlet end of the mechanical seal cavity.

[0063] In the construction of the flushing execution circuit, the outlet end of the variable frequency flushing pump 5 is connected to the inlet end of the mechanical seal cavity via a connecting pipeline, forming a channel for supplying cleaning flushing fluid to the sealing cavity. The variable frequency flushing pump 5 itself has a wide range of frequency adjustment capabilities (e.g., adjustable from 0-50Hz), and can output flushing fluid with different pressures and flow rates according to control commands. At the same time, the flow regulating valve 6 is connected in series in the connecting pipeline between the outlet end of the variable frequency flushing pump 5 and the inlet end of the mechanical seal cavity, and is used to adjust the flow rate of flushing fluid entering the sealing cavity in real time. Its opening degree can be continuously adjusted within the range of 0-100%, working in conjunction with the variable frequency flushing pump 5 to achieve precise control of flushing intensity.

[0064] The controller 7 is electrically connected to the gauge pressure sensor 1, the medium concentration sensor 2, the torque sensor 3, the flow sensor 4, the frequency conversion flushing pump 5, and the flow regulating valve 6, respectively.

[0065] In terms of electrical and control connections, controller 7, as the core processing unit of the entire device, establishes electrical connections with each of the aforementioned sensors and actuators. Specifically, the input terminals of controller 7 are electrically connected to gauge pressure sensor 1, medium concentration sensor 2, torque sensor 3, and flow sensor 4, for receiving pressure, concentration, torque, and flow signals collected by each sensor in real time. The output terminals of controller 7 are electrically connected to the variable frequency flushing pump 5 and flow regulating valve 6, for processing the input signals according to the built-in algorithm and sending frequency adjustment commands to the variable frequency flushing pump 5 and opening adjustment commands to the flow regulating valve 6, thereby achieving closed-loop control of the flushing action.

[0066] The acquisition unit of controller 7 acquires the gauge pressure value of the mechanical seal cavity sent by gauge pressure sensor 1, the medium concentration value of the mechanical seal cavity sent by medium concentration sensor 2, the torque value of the drive shaft sent by torque sensor 3, and the flow rate value of the variable frequency flushing pump 5 sent by flow sensor 4. The calculation unit of controller 7 calculates the leakage degree value of the mechanical seal cavity based on the gauge pressure value and the medium concentration value, and calculates the blockage degree value of the mechanical seal cavity based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump 5. The determination unit of controller 7 determines the fault level of the mechanical seal cavity based on the leakage degree value and the blockage degree value. The adjustment unit of controller 7 adjusts the variable frequency flushing pump 5 and the flow regulating valve 6 based on the fault level of the mechanical seal cavity to flush the mechanical seal cavity.

[0067] As the control center of the entire device, controller 7 continuously executes the following closed-loop control process after power-on: First, the acquisition unit of controller 7 acquires in real time the gauge pressure value at the outlet of the mechanical seal cavity collected by gauge pressure sensor 1, the outlet medium concentration value collected by medium concentration sensor 2, the real-time torque value of the drive shaft collected by torque sensor 3, and the outlet flow rate value of the variable frequency flushing pump 5 collected by flow sensor 4. These four parameters comprehensively characterize the current operating status of the mechanical seal cavity from four dimensions: fluid pressure, medium composition, mechanical resistance, and flushing intensity. Subsequently, the calculation unit of controller 7 calculates a quantified leakage degree value based on the outlet gauge pressure value and outlet medium concentration value, which characterize leakage characteristics, through a built-in data fusion algorithm. At the same time, it calculates the leakage degree value based on the drive shaft torque value and flushing flow rate value, which characterize blockage characteristics. The system obtains a quantified level of blockage, which transforms the raw multi-dimensional sensor data into a unified and comparable fault indicator. Next, the determination unit of controller 7 uses the leakage level and blockage level as a joint judgment criterion, comparing them with a preset threshold system to comprehensively determine the current fault level of the mechanical seal cavity. This fault level can be classified as no fault, minor fault, moderate fault, or severe fault, achieving precise classification of the sealing state. Finally, the adjustment unit of controller 7 dynamically generates differentiated control commands based on the determined fault level. On the one hand, it adjusts the operating frequency of the variable frequency flushing pump 5 to change the flushing pressure; on the other hand, it adjusts the opening of the flow regulating valve 6 to control the flushing flow rate, thereby performing adaptive variable frequency flushing of the mechanical seal cavity that matches the current fault severity. This device can automatically identify early fault symptoms of the mechanical seal and proactively intervene without human intervention. It promptly eliminates hidden dangers in the case of minor faults, controls the escalation of risks in the case of moderate faults, and ensures absolute safety in the case of severe faults, thus achieving intelligent flushing of the mechanical seal cavity.

[0068] Furthermore, the calculation unit transforms the raw acquired signals into quantifiable fault characteristic values ​​through a collaborative process: First, the first and second processing subunits perform dimensionless processing on the raw parameters. The first processing subunit converts the raw signals of gauge pressure and medium concentration, which have different dimensions and numerical ranges, into dimensionless gauge pressure and medium concentration characteristic values ​​through normalization or standardization, allowing them to participate in subsequent calculations on the same scale. Subsequently, the calculation subunit performs weighted calculations on these two dimensionless characteristic values, assigning weights according to the sensitivity of gauge pressure fluctuations and medium concentration changes to leakage faults, and then performs comprehensive calculations to obtain a leakage degree value that characterizes the severity of leakage in the sealing cavity. Similarly, the second processing subunit performs dimensionless processing on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump to obtain torque and flow characteristic values, which are then weighted and fused by the calculation subunit in conjunction with a preset blockage weight coefficient, finally outputting a blockage degree value that reflects the blockage status of the flushing pipeline or sealing cavity. Throughout the process, dimensionless processing solved the comparability problem of multi-source heterogeneous data, while weighted operation realized the comprehensive evaluation of multi-parameter fusion, providing a unified and reliable quantitative basis for subsequent fault level determination.

[0069] Furthermore, the device may also include a motor speed controller and a motor circuit breaker. The motor speed controller is electrically connected to the drive motor and controller 7 corresponding to the mechanical seal cavity, respectively. The motor circuit breaker is electrically connected to the drive motor and controller 7 corresponding to the mechanical seal cavity, respectively.

[0070] It should be noted that the device may also include a motor speed controller and a motor circuit breaker as graded execution units to improve the protection and control of the equipment body. The motor speed controller is electrically connected to the drive motor corresponding to the mechanical seal cavity and the controller 7, respectively. Its function is to receive speed adjustment commands issued by the controller 7 and adjust the operating speed of the drive motor in real time. When the controller 7 determines that the current fault level is a moderate fault and triggers a level two response, the motor speed controller reduces the speed of the drive motor to 70%-80% of the rated value, thereby reducing the relative movement speed and friction force of the mechanical seal surface, controlling the risk of fault expansion, and simultaneously cooperating with the enhanced flushing of the variable frequency flushing pump 5 to achieve online fault handling. The motor circuit breaker is electrically connected to the drive motor and the controller 7, respectively. As the final safety execution mechanism, it is used to receive an emergency stop command issued by the controller 7 when the controller 7 determines that the current fault level is a severe fault and triggers a level three response. It instantly cuts off the main power circuit of the drive motor, causing the equipment to stop running immediately, and simultaneously activates the audible and visual alarm device to issue a warning, thereby avoiding a large amount of media leakage or equipment damage caused by severe seal failure. By introducing a motor speed controller and a motor circuit breaker, this device constructs a complete hierarchical response chain, enabling the controller 7 to not only regulate flushing behavior but also directly intervene in the operating status of the main equipment, thus achieving multi-level and coordinated safety protection for the mechanical seal and the overall equipment.

[0071] In summary, this application provides a flushing device for a mechanical seal cavity, which is applied to the mechanical seal cavity. The mechanical seal cavity is also equipped with a gauge pressure sensor, a medium concentration sensor, a torque sensor, a flow sensor, a variable frequency flushing pump, and a flow regulating valve. The gauge pressure sensor, medium concentration sensor, and flow sensor are all located at the outlet end of the mechanical seal cavity; the torque sensor is located on the corresponding drive shaft of the mechanical seal cavity. This ensures that each sensor can directly collect key parameters reflecting the sealing state, providing a reliable data foundation for subsequent accurate diagnosis. The outlet end of the variable frequency flushing pump is connected to the inlet end of the mechanical seal cavity, and the flow regulating valve is located on the connecting pipeline between the outlet end of the variable frequency flushing pump and the inlet end of the mechanical seal cavity. This ensures that the variable frequency flushing pump can directly flush the mechanical seal cavity. The device is electrically connected to the gauge pressure sensor, medium concentration sensor, torque sensor, flow sensor, variable frequency flushing pump, and flow regulating valve, respectively. This facilitates the reception of information from each electrically connected device and improves the accuracy of mechanical seal cavity flushing.

[0072] The above-disclosed embodiments of the present application describe in detail the flushing device for the mechanical seal cavity. There are various methods that can be applied to the flushing device for the mechanical seal cavity of the present application. Therefore, the flushing method for the mechanical seal cavity provided by the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0073] Please see the appendix Figure 2 , Figure 2 This is a schematic flowchart illustrating a flushing method for a mechanical seal cavity provided in an embodiment of this application. The method is applied to a controller deployed in the mechanical seal cavity and may include the following steps:

[0074] Step S101: Obtain the gauge pressure value of the mechanical seal cavity sent by the gauge pressure sensor, the medium concentration value of the mechanical seal cavity sent by the medium concentration sensor, the torque value of the drive shaft sent by the torque sensor, and the flow rate value of the variable frequency flushing pump sent by the flow sensor.

[0075] Specifically, the system receives a pressure signal from a gauge pressure sensor installed at the outlet of the mechanical seal cavity. This signal reflects the real-time relative pressure (relative to atmospheric pressure) of the flushing fluid at the seal cavity outlet. This pressure value is directly related to the fluid resistance state inside the seal cavity. Under normal operating conditions, this value remains stable within a preset reference range; when the sealing surface becomes clogged due to particle deposition, fluid flow on the outlet side is obstructed, and the pressure will rise abnormally; when the seal fails, resulting in a large leak, the pressure may drop sharply. This parameter is one of the key bases for judging leakage faults.

[0076] The system receives a concentration signal from a medium concentration sensor also installed at the outlet of the mechanical seal cavity. This signal indicates the instantaneous concentration of the process medium (such as sludge or chemical solutes) in the flushing fluid flowing out of the seal cavity. Under normal circumstances, this concentration value is close to zero or maintained at an extremely low background value. Once a minute leak occurs at the sealing surface of the mechanical seal, the process medium will seep into the seal cavity and mix with the flushing fluid, causing an abnormal change in the medium concentration at the outlet. This parameter, together with the gauge pressure value, constitutes the two-parameter basis for leak fault diagnosis.

[0077] The system receives torque signals from a torque sensor mounted on the drive shaft. This signal reflects the dynamic rotational resistance torque experienced by the drive shaft during rotation. Since the drive shaft is fixedly connected to the rotating ring of the mechanical seal, when frictional resistance increases on the sealing surface due to particle deposition or poor lubrication, the drive shaft needs to output a larger torque to overcome the resistance. Therefore, this torque value is the most direct and sensitive mechanical characterization of the degree of blockage on the sealing surface and is a core parameter for determining blockage faults.

[0078] The system receives a flow signal from a flow sensor located in the flushing pipeline (usually at the outlet of the mechanical seal cavity or the outlet side of the variable frequency flushing pump). This signal indicates the instantaneous volumetric flow rate of the flushing fluid. This parameter serves two purposes: firstly, it helps determine the flow status inside the seal cavity, i.e., the outlet flow rate often decreases when blockage occurs; secondly, it provides feedback for closed-loop control, ensuring that subsequent adjustments to the flushing intensity are based on sound information.

[0079] Within each control cycle, the acquisition and caching of the four types of data mentioned above are completed synchronously, constructing a real-time dataset covering four dimensions: fluid pressure, media composition, mechanical resistance, and flushing intensity. This multi-source sensing process is the starting point of the entire intelligent flushing logic, and the comprehensiveness and accuracy of its data directly determine the reliability of subsequent fault diagnosis and the effectiveness of control strategies.

[0080] Step S102: Based on the gauge pressure value and medium concentration value of the mechanical seal cavity, calculate the leakage degree value of the mechanical seal cavity, and based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump, calculate the blockage degree value of the mechanical seal cavity.

[0081] In this application, the gauge pressure and medium concentration values ​​of the mechanical seal cavity are dimensionlessly processed to obtain the characteristic values ​​of the gauge pressure and medium concentration of the mechanical seal cavity. A weighted calculation is then performed on these characteristic values ​​to obtain the leakage degree value of the mechanical seal cavity. The torque value of the drive shaft and the flow rate value of the variable frequency flushing pump are also dimensionlessly processed to obtain the characteristic values ​​of the torque of the drive shaft and the flow rate of the variable frequency flushing pump. Based on the characteristic values ​​of the torque of the drive shaft, the flow rate of the variable frequency flushing pump, and a preset clogging weighting coefficient, the clogging degree value of the mechanical seal cavity is calculated.

[0082] Specifically, the collected gauge pressure and medium concentration values ​​of the mechanical seal cavity are first processed to be dimensionless. Since the gauge pressure (unit: MPa) and medium concentration (unit: mg / L or ppm) have different physical units and dimensions, they cannot be directly weighted. Therefore, a normalization algorithm is needed to convert them into dimensionless gauge pressure and medium concentration characteristic values. Common processing methods include extreme value normalization (mapping real-time values ​​to the [0,1] interval) or deviation percentage conversion (calculating the degree of deviation relative to a preset benchmark value), thereby eliminating the influence of dimensions and making the two parameters comparable and additiveable.

[0083] Based on the dimensionless eigenvalues ​​obtained above, a weighted fusion is performed using a preset leakage weighting coefficient to calculate the leakage degree of the mechanical seal cavity. This calculation model can be expressed as L = α × P. n +β×C n , where P n C is the characteristic value of gauge pressure. nThe pressure and concentration are characteristic values ​​of the medium concentration, and α and β are preset leakage weighting coefficients (α+β=1 or set independently according to actual operating conditions). These weighting coefficients reflect the relative importance of pressure and concentration in leakage assessment. For example, under conditions of large pressure fluctuations, the pressure weight can be appropriately reduced and the concentration weight increased to enhance anti-interference capabilities. Through this fusion calculation, the two-dimensional sensor information is compressed into a quantitative indicator that comprehensively reflects the severity of the leakage.

[0084] Meanwhile, the collected drive shaft torque value and variable frequency flushing pump flow rate value are dimensionless to obtain torque characteristic value and flow characteristic value. It is worth noting that in the judgment of blockage faults, the abnormality of the flow rate value is usually manifested as a decrease in flow rate (i.e., the actual flow rate is lower than the expected value). Therefore, the flow rate deviation or the percentage decrease is often used as a characteristic parameter. For example, the flow characteristic value is defined as (Q0−Q) / Q0, where Q0 is the preset normal operating condition reference flow rate and Q is the real-time flow rate value. The larger the value, the more severe the blockage.

[0085] Based on the dimensionless torque and flow characteristic values, and combined with a preset clogging weighting coefficient, the degree of clogging in the mechanical seal cavity is calculated through weighted fusion. The calculation model can be expressed as D=γ×T n +δ×F n T n F is the characteristic value of torque. n The torque value represents the flow rate characteristic (or flow rate decrease characteristic), while γ and δ are preset blockage weighting coefficients. The torque value directly reflects the frictional resistance of the sealing surface and is the core parameter for blockage judgment; the flow rate value serves as an auxiliary parameter to verify whether a blockage has actually occurred (for example, if the torque increases but the flow rate is normal, it may be a torque fluctuation caused by changes in the viscosity of the medium rather than a true blockage). By fusing these two parameters, the risk of misjudgment under complex operating conditions using a single torque signal is effectively avoided.

[0086] The four original physical quantities (with different units) were transformed into two quantified dimensionless indices: the leakage level value L and the blockage level value D. These two indices unified the dimensions of the different sensors, eliminated the influence of signal interference, and laid a precise data foundation for subsequent fault level determination based on a unified threshold system.

[0087] Step S103: Determine the fault level of the mechanical seal cavity based on the leakage level and blockage level of the mechanical seal cavity.

[0088] In this application, if the leakage degree value of the mechanical seal chamber belongs to the first preset leakage degree range and the blockage degree value of the mechanical seal chamber belongs to the first preset blockage degree range, then it is determined that the fault level of the mechanical seal chamber is the first fault level. The first preset leakage degree range is the range greater than the first preset leakage degree value and not greater than the second preset leakage degree value. The first preset blockage degree range is the range greater than the first preset blockage degree value and not greater than the second preset blockage degree value. If the leakage degree value of the mechanical seal chamber belongs to the first preset leakage degree range and the blockage degree value of the mechanical seal chamber belongs to the second preset blockage degree range, or if the leakage degree value of the mechanical seal chamber belongs to the second preset leakage degree range and the blockage degree value of the mechanical seal chamber does not belong to the third preset blockage degree range, then it is determined that the fault level of the mechanical seal chamber is the second fault level. The second preset leakage degree range is the range greater than the second preset leakage degree value and not greater than the third preset leakage degree value. The second preset blockage degree range is the range greater than the second preset blockage degree value and not greater than the third preset blockage degree value. If the leakage degree value of the mechanical seal chamber does not belong to the third preset leakage degree range and the blockage degree value of the mechanical seal chamber belongs to the third preset blockage degree range, or if the leakage degree value of the mechanical seal chamber belongs to the second preset leakage degree range and the blockage degree value of the mechanical seal chamber does not belong to the third preset blockage degree range, then it is determined that the fault level of the mechanical seal chamber is the third fault level. The third preset leakage degree range is the range greater than the third preset leakage degree value and not greater than the fourth preset leakage degree value. The third preset blockage degree range is the range greater than the third preset blockage degree value and not greater than the fourth preset blockage degree value. If the leakage degree value of the mechanical seal chamber belongs to the third preset leakage degree range and the blockage degree value of the mechanical seal chamber belongs to the third preset blockage degree range, then it is determined that the fault level of the mechanical seal chamber is the fourth fault level.

[0089] Specifically, the single - level classification is performed on the leakage degree value L and the blockage degree value D respectively. There are three groups of thresholds preset internally: the first leakage threshold L1, the second leakage threshold L2, the third leakage threshold L3 (satisfying L1 < L2 < L3), and the corresponding first blockage threshold D1, the second blockage threshold D2, the third blockage threshold D3 (satisfying D1 < D2 < D3). By comparing with these thresholds step by step, the leakage degree value is divided into four single - level leakage grades: when L ≤ L1, it is determined that G L = 1 (normal); when L1 < L ≤ L2, it is determined that G L = 2 (slight leakage); when L2 < L ≤ L3, it is determined that G L = 3 (moderate leakage); when L > L3, it is determined that G L = 4 (severe leakage). Similarly, the blockage degree value D is also divided into single - level blockage grades G according to the same logic D=1, 2, 3, 4, corresponding to normal, slight blockage, moderate blockage, and severe blockage, respectively.

[0090] Subsequently, based on the principle of "the most severe case determining the overall level," the two individual levels were merged for assessment. Specifically, the leakage level G was taken. L and blockage level G D The maximum value in the range is taken as the final comprehensive fault level G = max(G L G D The physical meaning of this judgment logic is that the overall safety status of the mechanical seal cavity depends on its weakest link. Whether the failure is caused by leakage or blockage, as long as the severity of one of the failures reaches a certain level, it should be responded to at that level to ensure that safety is not underestimated. For example, when the leakage is only minor (G... L =1) and the blockage has reached a severe level (G) D When the overall level is G=3, the comprehensive level is set to G=3, which means it is treated as a severe fault.

[0091] According to the above fusion rules, the overall fault level G is divided into four continuously increasing levels, each corresponding to different device states and handling requirements: First fault level (G=1): corresponding to G L =1 and G D =1, meaning both leakage and blockage values ​​are within the normal range, indicating that the mechanical seal cavity is currently operating without fault, the device maintains routine monitoring, and no active intervention is triggered; Second fault level (G=2): corresponding to G L =2 or G D =2, and neither is greater than 2, indicating that at least one parameter has reached the minor fault threshold but has not exceeded the moderate threshold. The device is judged to have a minor fault and a first-level response (such as basic inverter flushing) needs to be initiated; Third fault level (G=3): corresponding to G L =3 or G D =3, and neither of them is greater than 3, indicating that at least one parameter has reached the moderate fault threshold. The device is judged to be in a moderate fault condition and a level two response (enhanced flushing combined with equipment speed reduction) needs to be initiated; Fourth fault level (G=4): corresponding to G L =4 or G D =4 indicates that at least one parameter has reached the severe fault threshold, the device is judged to be in severe fault condition, and a level 3 response (emergency shutdown and triggering of audible and visual alarms) needs to be initiated.

[0092] This fault level determination process successfully compresses multi-dimensional sensor information into a clear and operable fault level label. This label is directly transmitted to the subsequent graded response execution unit, driving the variable frequency flushing pump, flow regulating valve, motor speed controller, and motor circuit breaker to work together, achieving intelligent control of the mechanical seal cavity from autonomous elimination of minor faults to safe shutdown of severe faults.

[0093] Step S104: Adjust the variable frequency flushing pump and flow control valve based on the fault level of the mechanical seal cavity to flush the mechanical seal cavity.

[0094] In this application, when the mechanical seal cavity failure level is the first failure level, the frequency of the variable frequency flushing pump and the opening of the flow control valve are kept constant. When the mechanical seal cavity failure level is the second failure level, the frequency of the variable frequency flushing pump is adjusted to a first preset frequency, and the opening of the flow control valve is adjusted to a first preset opening. When the mechanical seal cavity failure level is the third failure level, the frequency of the variable frequency flushing pump is adjusted to a second preset frequency, and the opening of the flow control valve is adjusted to a second preset opening, where the second preset frequency is greater than the first preset frequency, and the second preset opening is greater than the first preset opening. When the mechanical seal cavity failure level is the fourth failure level, the frequency of the variable frequency flushing pump is adjusted to a third preset frequency, and the opening of the flow control valve is adjusted to a third preset opening, where the third preset frequency is greater than the second preset frequency, and the third preset opening is greater than the second preset opening.

[0095] Specifically, when the overall fault level is level two (G=2, minor fault), it is determined that the current situation is a minor leak or minor blockage. At this time, the overall operating status of the equipment is still safe, and no intervention is required for the main equipment. Based on this, a first-level flushing command is generated: the frequency of the variable frequency flushing pump is adjusted to the first preset frequency (e.g., 20-30Hz), and the opening of the flow regulating valve is adjusted to the first preset opening (e.g., 50%). Under this parameter combination, the flushing device performs directional flushing of the mechanical seal cavity with moderate intensity and flow rate, aiming to remove small amounts of particles adhering to the sealing surface or dilute trace amounts of leaked media, restoring the seal to normal. During flushing, sensor feedback is continuously monitored. Once the leakage and blockage values ​​return to the normal range, flushing stops; if the flushing effect is unsatisfactory, a fault level escalation may be triggered.

[0096] When the overall fault level is level three (G=3, moderate fault), the severity of the fault is considered to have increased, and a simple conventional flush may not be sufficient to quickly eliminate the hidden danger. Therefore, a secondary flushing command is generated: the frequency of the variable frequency flushing pump is increased to a second preset frequency (e.g., 40-50Hz), which is higher than the first preset frequency, to provide stronger flushing pressure; simultaneously, the opening of the flow regulating valve is increased to a second preset opening (e.g., 100%) to achieve enhanced flushing with maximum flow. Under these parameters, the flushing device flushes the sealing cavity with high flow and high intensity, striving to clear blockages or remove leaking media in a short time. At the same time, according to the graded response strategy, a command is also sent to the motor speed controller to reduce the speed of the main drive motor to 70%-80% of its rated value, reducing the relative movement and friction of the sealing surfaces, working in conjunction with the enhanced flushing to control the risk of the fault escalating.

[0097] When the overall fault level is level four (G=4, severe fault), the fault is considered to have reached the most severe level, and the sealing cavity may be at risk of imminent failure. At this point, the emergency protection action is immediately triggered: the power supply to the main drive motor is cut off via the motor circuit breaker to achieve an emergency shutdown of the equipment, and an audible and visual alarm is activated. Simultaneously, a three-level flushing command is generated: the frequency of the variable frequency flushing pump is adjusted to the third preset frequency (e.g., the highest safe frequency for short-term operation), and the opening of the flow regulating valve is adjusted to the third preset opening (usually 100%). This final flushing action, performed while the equipment is shut down, aims to remove as much harmful media as possible from the sealing cavity, creating safe conditions for subsequent maintenance, or attempting a final salvage flush before complete equipment failure.

[0098] Through the above-described tiered flushing execution logic, this method realizes a complete differentiated response chain, ensuring that each level of fault receives treatment commensurate with its severity, thereby minimizing unnecessary downtime and improving production continuity while ensuring equipment safety.

[0099] Furthermore, the method may also include the following steps: when the fault level of the mechanical seal cavity is the third fault level, the initial speed of the drive motor corresponding to the mechanical seal cavity is adjusted to a preset speed by a motor speed controller, wherein the initial speed is greater than the preset speed. When the fault level of the mechanical seal cavity is the fourth fault level, the main power supply of the drive motor corresponding to the mechanical seal cavity is cut off by a motor circuit breaker.

[0100] It should be noted that the flushing device for the mechanical seal cavity may also include a motor speed controller and a motor circuit breaker. The motor speed controller is electrically connected to the drive motor corresponding to the mechanical seal cavity. The motor circuit breaker is electrically connected to the drive motor corresponding to the mechanical seal cavity.

[0101] Specifically, when the mechanical seal cavity's fault level is level three, the motor speed controller adjusts the operating speed of the drive motor corresponding to the mechanical seal cavity from its initial speed to a preset speed, where the initial speed is greater than the preset speed. Specifically, a speed reduction command is sent to the motor speed controller to reduce the drive motor's speed to 70%-80% of its rated value, reducing the relative movement speed and frictional force on the mechanical seal surface. This strengthens flushing while controlling the risk of fault expansion, achieving coordinated protection under moderate fault conditions. When the mechanical seal cavity's fault level is level four, the main power supply to the drive motor corresponding to the mechanical seal cavity is cut off via the motor circuit breaker. Specifically, an emergency stop command is sent to the motor circuit breaker, instantly cutting off the drive motor's main power circuit, causing the equipment to stop immediately. Simultaneously, an audible and visual alarm is activated to prevent large-scale media leakage or equipment damage due to severe seal failure, achieving final safety protection under severe fault conditions.

[0102] After adjusting the variable frequency flushing pump and flow control valve based on the fault level of the mechanical seal cavity to flush the mechanical seal cavity, the method may further include the following steps: acquiring the gauge pressure value of the mechanical seal cavity after flushing (sent by a gauge pressure sensor), the medium concentration value of the mechanical seal cavity after flushing (sent by a medium concentration sensor), the torque value of the drive shaft after flushing (sent by a torque sensor), and the flow rate value of the variable frequency flushing pump after flushing (sent by a flow sensor). Based on the gauge pressure value and the medium concentration value of the mechanical seal cavity after flushing, the leakage degree value of the mechanical seal cavity after flushing is calculated, and based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump after flushing, the blockage degree value of the mechanical seal cavity after flushing is calculated. Based on the leakage degree value, the blockage degree value, the leakage degree value, and the blockage degree value of the mechanical seal cavity after flushing, the first preset frequency, the second preset frequency, the third preset frequency, the first preset opening degree, the second preset opening degree, and the third preset opening degree are optimized.

[0103] Specifically, after completing one round of adaptive flushing targeting a specific fault level, a data acquisition operation is performed again to obtain the sensor readings in real time. Specifically, this involves re-receiving the gauge pressure value of the mechanical seal cavity after flushing from the gauge pressure sensor, the medium concentration value of the mechanical seal cavity after flushing from the medium concentration sensor, the torque value of the drive shaft after flushing from the torque sensor, and the flow rate value of the variable frequency flushing pump after flushing from the flow sensor. This set of data reflects the latest operating status of the mechanical seal cavity after the flushing action and serves as the basis for evaluating the flushing effect.

[0104] Based on the sensor data after flushing, the fusion calculation logic of step S102 is repeated: the gauge pressure and medium concentration values ​​after flushing are dimensionlessly processed and weighted to obtain the leakage degree value L′ after flushing; simultaneously, the torque and flow rates after flushing are dimensionlessly processed and weighted to obtain the blockage degree value D′ after flushing. These two new degree values ​​quantitatively characterize the remaining fault level of the sealing cavity after flushing intervention. By comparing them with the fault degree values ​​L and D before flushing, the actual effect of this flushing can be objectively evaluated.

[0105] The leakage level L and blockage level D before flushing are comprehensively analyzed, along with the leakage level L′ and blockage level D′ after flushing, to determine whether the flushing effect met expectations. Based on this, a parameter self-optimization mechanism is activated to dynamically adjust the preset parameters relied upon for subsequent flushing. If L′ and D′ both significantly decrease to the normal range after flushing (i.e., successful handling), the fault level, actual frequency, and opening parameters used in this flushing are recorded, and successful handling cases of similar faults are accumulated in the historical database. When the same fault level is successfully handled multiple times, the preset frequency and preset opening corresponding to that level can be gradually fine-tuned to bring them closer to the optimal values. For example, if multiple minor blockages are successfully cleared at a frequency of 22Hz, the baseline value of the first preset frequency can be optimized from a wide range of 20-30Hz to a recommended value of 22Hz, improving subsequent response efficiency. If the decrease in L′ and D′ after this flushing is limited and fails to restore the sealing cavity to its normal state (i.e., the treatment effect is insufficient), the current preset parameters are determined to be insufficient to handle this condition, and parameter enhancement adjustments are triggered. For example, the first preset frequency corresponding to the fault level may be appropriately increased, the first preset opening may be appropriately increased, or the judgment time of the flushing effect may be shortened to ensure stronger handling capabilities when the same type of fault occurs again. If L′ and D′ increase instead of decreasing after this flushing (i.e., the fault continues to worsen), this treatment is marked as a failure case, and the preset parameters and fault level judgment thresholds are reviewed and corrected. At the same time, the treatment strategy for this fault type may be migrated to a higher-level preset parameter.

[0106] Not only can it perform adaptive flushing based on real-time fault levels, but it can also continuously learn and optimize preset parameters based on the actual effect of each flush, enabling the device to adapt and evolve in the face of changing operating conditions (such as seasonal fluctuations in media viscosity, equipment aging, etc.). This feedback optimization mechanism ensures that the device maintains efficient and accurate flushing protection performance throughout long-term operation, further enhancing the equipment's intelligence level and industrial applicability.

[0107] In summary, this application provides a flushing method for a mechanical seal cavity. This method acquires the gauge pressure value of the mechanical seal cavity from a gauge pressure sensor, the medium concentration value of the mechanical seal cavity from a medium concentration sensor, the torque value of the drive shaft from a torque sensor, and the flow rate value of the variable frequency flushing pump from a flow sensor. This dual-parameter fusion algorithm effectively overcomes the deficiency of single parameters being easily interfered with under particulate media conditions. Based on the gauge pressure and medium concentration values ​​of the mechanical seal cavity, the leakage degree of the mechanical seal cavity is calculated, and based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump, the blockage degree of the mechanical seal cavity is calculated. Based on the leakage and blockage degrees of the mechanical seal cavity, the fault level of the mechanical seal cavity is determined. Based on the fault level of the mechanical seal cavity, the variable frequency flushing pump and flow control valve are adjusted to flush the mechanical seal cavity. This grading mechanism enables automatic application of differentiated adjustment strategies for different degrees of fault. Therefore, this application improves the targeting and timeliness of mechanical seal cavity flushing.

[0108] This application also provides a computer program product including computer-readable instructions, which, when executed on an electronic device, cause the electronic device to implement any of the mechanical seal cavity flushing methods provided in this application.

[0109] This application also provides a computer-readable storage medium carrying one or more computer programs. When the one or more computer programs are executed by an electronic device, the electronic device can implement any of the mechanical seal cavity flushing methods provided in this application.

[0110] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.

[0111] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware, or it can be implemented by special-purpose hardware including application-specific integrated circuits, special-purpose CPUs, special-purpose memory, special-purpose components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for this application, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, training equipment, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0112] In the above embodiments, the implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, in the form of a computer program product.

[0113] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).

Claims

1. A flushing method for a mechanical seal cavity, characterized in that, A controller is applied to a mechanical seal cavity, which is further equipped with a gauge pressure sensor, a medium concentration sensor, a torque sensor, a flow sensor, a variable frequency flushing pump, and a flow regulating valve. The gauge pressure sensor, the medium concentration sensor, and the flow sensor are all located at the outlet end of the mechanical seal cavity. The torque sensor is located on the corresponding drive shaft of the mechanical seal cavity. The outlet end of the variable frequency flushing pump is connected to the inlet end of the mechanical seal cavity, and the flow regulating valve is located on the connecting pipeline between the outlet end of the variable frequency flushing pump and the inlet end of the mechanical seal cavity. The controller is electrically connected to the gauge pressure sensor, the medium concentration sensor, the torque sensor, the flow sensor, the variable frequency flushing pump, and the flow regulating valve. The flushing method includes: The instrument obtains the gauge pressure value of the mechanical seal cavity detected by the gauge pressure sensor, the medium concentration value of the mechanical seal cavity detected by the medium concentration sensor, the torque value of the drive shaft detected by the torque sensor, and the flow rate value of the variable frequency flushing pump detected by the flow sensor. Based on the gauge pressure value and the medium concentration value of the mechanical seal cavity, the leakage degree value of the mechanical seal cavity is calculated, and based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump, the blockage degree value of the mechanical seal cavity is calculated. The fault level of the mechanical seal cavity is determined based on the leakage level and the blockage level of the mechanical seal cavity. The variable frequency flushing pump and the flow regulating valve are adjusted based on the fault level of the mechanical seal cavity to flush the mechanical seal cavity.

2. The flushing method for the mechanical seal cavity according to claim 1, characterized in that, The leakage degree of the mechanical seal cavity is calculated based on the gauge pressure value and the medium concentration value of the mechanical seal cavity, and the blockage degree of the mechanical seal cavity is calculated based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump, including: The gauge pressure value and the medium concentration value of the mechanical seal cavity are dimensionlessly processed to obtain the gauge pressure characteristic value and the medium concentration characteristic value of the mechanical seal cavity. The leakage degree value of the mechanical seal cavity is obtained by weighting the gauge pressure characteristic value and the medium concentration characteristic value of the mechanical seal cavity. The torque value of the drive shaft and the flow rate value of the variable frequency flushing pump are dimensionless to obtain the torque characteristic value of the drive shaft and the flow rate characteristic value of the variable frequency flushing pump. Based on the torque characteristic value of the drive shaft, the flow characteristic value of the variable frequency flushing pump, and the preset blockage weighting coefficient, the blockage degree value of the mechanical seal cavity is calculated.

3. The flushing method for the mechanical seal cavity according to claim 1, characterized in that, The determination of the fault level of the mechanical seal cavity based on the leakage level value and the blockage level value of the mechanical seal cavity includes: If the leakage level of the mechanical seal cavity is within a first preset leakage level range and the blockage level of the mechanical seal cavity is within a first preset blockage level range, then the fault level of the mechanical seal cavity is determined to be the first fault level. The first preset leakage level range is a range greater than the first preset leakage level value and not greater than the second preset leakage level value, and the first preset blockage level range is a range greater than the first preset blockage level value and not greater than the second preset blockage level value. If the leakage level of the mechanical seal cavity is within a first preset leakage level range and the blockage level of the mechanical seal cavity is within a second preset blockage level range, or if the leakage level of the mechanical seal cavity is within a second preset leakage level range and the blockage level of the mechanical seal cavity is not within a third preset blockage level range, then the fault level of the mechanical seal cavity is determined to be the second fault level. The second preset leakage level range is a range greater than the second preset leakage level value and not greater than the third preset leakage level value, and the second preset blockage level range is a range greater than the second preset blockage level value and not greater than the third preset blockage level value. If the leakage level of the mechanical seal cavity does not fall within the third preset leakage level range and the blockage level of the mechanical seal cavity falls within the third preset blockage level range, or if the leakage level of the mechanical seal cavity falls within the second preset leakage level range and the blockage level of the mechanical seal cavity does not fall within the third preset blockage level range, then the fault level of the mechanical seal cavity is determined to be the third fault level. The third preset leakage level range is a range greater than the third preset leakage level value and not greater than the fourth preset leakage level value, and the third preset blockage level range is a range greater than the third preset blockage level value and not greater than the fourth preset blockage level value. If the leakage level of the mechanical seal cavity falls within the third preset leakage level range and the blockage level of the mechanical seal cavity falls within the third preset blockage level range, then the fault level of the mechanical seal cavity is determined to be the fourth fault level.

4. The flushing method for the mechanical seal cavity according to claim 3, characterized in that, The adjustment of the variable frequency flushing pump and the flow regulating valve based on the fault level of the mechanical seal cavity includes: When the fault level of the mechanical seal cavity is the first fault level, the frequency of the variable frequency flushing pump and the opening of the flow regulating valve are kept constant. When the fault level of the mechanical seal cavity is the second fault level, the frequency of the variable frequency flushing pump is adjusted to the first preset frequency, and the opening of the flow regulating valve is adjusted to the first preset opening. When the fault level of the mechanical seal cavity is the third fault level, the frequency of the variable frequency flushing pump is adjusted to the second preset frequency, and the opening of the flow regulating valve is adjusted to the second preset opening. The second preset frequency is greater than the first preset frequency, and the second preset opening is greater than the first preset opening. When the fault level of the mechanical seal cavity is the fourth fault level, the frequency of the variable frequency flushing pump is adjusted to the third preset frequency, and the opening of the flow regulating valve is adjusted to the third preset opening. The third preset frequency is greater than the second preset frequency, and the third preset opening is greater than the second preset opening.

5. The flushing method for the mechanical seal cavity according to claim 3, characterized in that, The mechanical seal cavity is also equipped with a motor speed controller and a motor circuit breaker; the motor speed controller is electrically connected to the drive motor corresponding to the mechanical seal cavity and the controller, respectively. The motor circuit breaker is electrically connected to the drive motor corresponding to the mechanical seal cavity and the controller, respectively. The method further includes: When the fault level of the mechanical seal cavity is the third fault level, the initial speed of the drive motor corresponding to the mechanical seal cavity is adjusted to a preset speed by the motor speed controller, and the initial speed is greater than the preset speed. When the fault level of the mechanical seal cavity is the fourth fault level, the main power supply of the drive motor corresponding to the mechanical seal cavity is cut off by the motor circuit breaker.

6. The flushing method for the mechanical seal cavity according to claim 4, characterized in that, After adjusting the variable frequency flushing pump and the flow control valve based on the fault level of the mechanical seal cavity to flush the mechanical seal cavity, the method further includes: The instrument obtains the gauge pressure value of the mechanical seal cavity after flushing sent by the gauge pressure sensor, the medium concentration value of the mechanical seal cavity after flushing sent by the medium concentration sensor, the torque value of the drive shaft after flushing sent by the torque sensor, and the flow rate value of the variable frequency flushing pump after flushing sent by the flow sensor. Based on the gauge pressure value and the medium concentration value of the mechanical seal cavity after flushing, the leakage degree value of the mechanical seal cavity after flushing is calculated, and based on the torque value of the drive shaft after flushing and the flow rate value of the variable frequency flushing pump after flushing, the blockage degree value of the mechanical seal cavity after flushing is calculated. Based on the leakage degree value of the mechanical seal cavity, the blockage degree value of the mechanical seal cavity, the leakage degree value of the flushed mechanical seal cavity, and the blockage degree value of the flushed mechanical seal cavity, the first preset frequency, the second preset frequency, the third preset frequency, the first preset opening degree, the second preset opening degree, and the third preset opening degree are optimized.

7. A flushing device for a mechanical seal cavity, characterized in that, The flushing device is applied to the mechanical seal cavity; the mechanical seal cavity is also equipped with a gauge pressure sensor, a medium concentration sensor, a torque sensor, a flow sensor, a variable frequency flushing pump, and a flow regulating valve; the gauge pressure sensor, the medium concentration sensor, and the flow sensor are all located at the outlet end of the mechanical seal cavity; the torque sensor is located on the corresponding drive shaft of the mechanical seal cavity; the outlet end of the variable frequency flushing pump is connected to the inlet end of the mechanical seal cavity, and the flow regulating valve is located on the connecting pipeline between the outlet end of the variable frequency flushing pump and the inlet end of the mechanical seal cavity; the flushing device is electrically connected to the gauge pressure sensor, the medium concentration sensor, the torque sensor, the flow sensor, the variable frequency flushing pump, and the flow regulating valve respectively; The flushing device includes: The acquisition unit is used to acquire the gauge pressure value of the mechanical seal cavity detected by the gauge pressure sensor, the medium concentration value of the mechanical seal cavity detected by the medium concentration sensor, the torque value of the drive shaft detected by the torque sensor, and the flow rate value of the variable frequency flushing pump detected by the flow sensor. The calculation unit is used to calculate the leakage degree value of the mechanical seal cavity based on the gauge pressure value and the medium concentration value of the mechanical seal cavity, and to calculate the blockage degree value of the mechanical seal cavity based on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump. The determining unit is used to determine the fault level of the mechanical seal cavity based on the leakage level value and the blockage level value of the mechanical seal cavity; An adjustment unit is used to adjust the variable frequency flushing pump and the flow regulating valve based on the fault level of the mechanical seal cavity in order to flush the mechanical seal cavity.

8. The flushing device for the mechanical seal cavity according to claim 7, characterized in that, The computing unit includes: The first processing subunit is used to perform dimensionless processing on the gauge pressure value of the mechanical seal cavity and the medium concentration value of the mechanical seal cavity to obtain the gauge pressure characteristic value and the medium concentration characteristic value of the mechanical seal cavity. The calculation subunit is used to perform a weighted calculation on the gauge pressure characteristic value of the mechanical seal cavity and the medium concentration characteristic value of the mechanical seal cavity to obtain the leakage degree value of the mechanical seal cavity; The second processing subunit is used to perform dimensionless processing on the torque value of the drive shaft and the flow rate value of the variable frequency flushing pump to obtain the torque characteristic value of the drive shaft and the flow rate characteristic value of the variable frequency flushing pump. The calculation subunit is used to calculate the degree of blockage of the mechanical seal cavity based on the torque characteristic value of the drive shaft, the flow characteristic value of the variable frequency flushing pump, and a preset blockage weighting coefficient.

9. A computer program product, characterized in that, Includes computer-readable instructions that, when executed on an electronic device, cause the electronic device to implement the flushing method for the mechanical seal cavity as described in any one of claims 1 to 6.

10. A computer storage medium, characterized in that, The storage medium carries one or more computer programs that, when executed by an electronic device, enable the electronic device to implement the flushing method for the mechanical seal cavity as described in any one of claims 1 to 6.

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