Roots pump accelerated degradation test device and method for multi-stress environment

Abstract

The invention discloses a Roots pump accelerated degradation test device and method aiming at a multi-stress environment. The device comprises a plurality of test branches, a test base, a gas storage tank, a particle injection tank, a gas circulation pipeline, a particle filtering and collecting device and a multi-parameter monitoring system, the test branch is fixedly arranged on the test base and comprises a plurality of roots pumps and screw pumps which are connected in sequence; the gas storage tank is arranged at one end of the test base and is connected with the input ends of the different test branches through gas circulation pipelines; the gas circulation pipeline between the gas storage tank and the test branch is also connected with a particle injection tank; the output end of the test branch is connected with the particle filtering and collecting device through a gas circulating pipeline; the multi-parameter monitoring system comprises a plurality of sensors and a multi-parameter monitoring platform. According to the invention, the accelerated degradation and performance degradation characteristic test can be carried out on the roots pump under the multi-stress environment of high particle concentration, high temperature, variable load and the like, and the scientific evaluation of the service reliability and failure mechanism of the roots pump is realized.

Description

Technical Field

[0001] The present invention belongs to the field of industrial vacuum equipment reliability testing, and in particular relates to a device and method for accelerating degradation testing of a Roots pump under a multi-stress environment. Background Art

[0002] As core equipment in modern metallurgical and chemical vacuum systems, Roots pumps play a critical role in vacuum systems in industries such as steel, chemical engineering, and high-end manufacturing. Taking the steelmaking process as an example, Roots pumps are widely used in processes such as VD (vacuum degassing), VOD (vacuum oxygen decarburization), and RH (recirculating degassing), fulfilling the tasks of rapidly reducing pressure, maintaining a stable vacuum level, and pumping gases high in particulate matter. Their performance stability and reliability are crucial for ensuring the safe and efficient operation of high-vacuum production processes. However, existing accelerated degradation testing technologies and equipment in China are significantly inadequate in simulating the actual service environment of Roots pumps, hindering in-depth research into the performance degradation patterns and lifespan prediction of Roots pumps.

[0003] Specifically, existing test equipment is mostly limited to simplified or idealized test conditions, making it difficult to fully replicate the complex operating conditions faced by Roots pumps in actual industrial applications, such as high temperatures, high particle concentrations, transient pressure fluctuations, and variable loads. This inadequate simulation environment leads to a distorted understanding of Roots pump performance under real-world service conditions, which in turn affects the accuracy of performance degradation patterns and lifespan predictions.

[0004] Furthermore, existing testing equipment also presents challenges in data collection and processing. Because Roots pump performance changes under complex operating conditions are often very subtle, high-precision sensors and data processing technologies are required to capture these changes. However, existing testing equipment often suffers from insufficient accuracy and limited monitoring parameters, resulting in inaccurate monitoring and analysis of Roots pump performance degradation. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of existing Roots pump degradation test technology, such as its difficulty in truly reflecting complex industrial working conditions, imperfect test parameter monitoring, and difficulty in systematically analyzing performance degradation laws. The present invention provides a Roots pump accelerated degradation test device and method under multi-stress environments. The device can perform accelerated degradation and performance degradation characteristic tests on Roots pumps under multi-stress environments such as high particle concentration, high temperature, and variable load, thereby achieving a scientific evaluation of the service reliability and failure mechanism of the Roots pumps.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides an accelerated degradation test device for a Roots pump under a multi-stress environment, comprising: several test branches, a test base, a gas storage tank, a particle injection tank, a gas circulation pipeline, a particle filtering and collecting device, and a multi-parameter monitoring system.

[0008] The test branch is fixedly arranged on the test base, and the test branch includes several Roots pumps and screw pumps connected in sequence; the gas storage tank is arranged at one end of the test base, and the gas storage tank is connected to the input ends of different test branches through gas circulation pipelines; the gas circulation pipeline between the gas storage tank and the test branch is also connected to a particle injection tank; the output end of the test branch is connected to the particle filtering and collecting device through a gas circulation pipeline; the multi-parameter monitoring system includes a plurality of sensors arranged in the gas circulation pipeline and a multi-parameter monitoring platform for receiving sensor data.

[0009] In one possible embodiment, the output end of the gas storage tank is connected to a gas diversion main line, and the gas output from the gas storage tank is diverted through the gas diversion main line and then input into each test branch respectively. The connection part between the gas diversion main line and each test branch is respectively provided with a gas branch line shut-off valve for controlling the transmission of all gases in the current branch.

[0010] In one possible embodiment, the output end of the particle injection tank is connected to the particle diversion main line, and the gas containing particles is diverted through the particle diversion main line and then input into each test branch respectively. The connection part between the particle diversion main line and each test branch is respectively provided with a particle branch line stop valve for controlling the transmission of the gas containing particles in the current branch, and the particle branch line stop valve is arranged before the gas branch line stop valve.

[0011] In a possible implementation, the sensors of the multi-parameter monitoring system include a particle concentration detector, an inlet flow meter, a pressure sensor, a temperature sensor, and an outlet flow meter.

[0012] In one possible embodiment, a particle concentration detector and an inlet flow meter are also provided on the pipeline between the input end of the main pump-Roots pump in the test branch and the corresponding gas branch stop valve; a pressure sensor and a temperature sensor are provided on the input pipeline of each stage of the pump, and the pumps at each stage are connected by a gas pipeline; the output end of the last stage of the Roots pump is connected to the input end of the screw pump; the output end of the screw pump is provided with an outlet flow meter, and the output ends of the screw pumps of different test branches are connected to the corresponding input ends of the return pipeline, and the merged gas is input into the particle filtering and collecting device through the output end of the return pipeline.

[0013] In one possible embodiment, the particle filter collection device includes a particle filter device and a particle recovery device. The particle filter device filters the combined gas for particles and then transmits the particles to the gas storage tank through a gas recovery pipeline. At the same time, the filtered particles are recovered by the particle recovery device.

[0014] In one possible embodiment, the multi-parameter monitoring system collects the pressure, temperature, flow rate and particle concentration of key nodes in each test branch in real time through the installed sensors, and transmits them to the multi-parameter monitoring platform; the collected sensor data is stored and displayed through the multi-parameter monitoring platform to achieve real-time visualization of parameters and traceability comparison of historical data.

[0015] In one possible embodiment, the device further includes a pneumatic butterfly valve provided in the pipeline section requiring maintenance and isolation, which is used to close when the device is shut down for maintenance or component replacement to isolate the specific pipeline or equipment section and prevent gas or particle leakage.

[0016] In a possible implementation, the multi-parameter monitoring system further includes a vibration sensor, which is disposed at the monitoring position of each stage of the pump as required.

[0017] In a second aspect, an embodiment of the present application provides a method for accelerating degradation testing of a Roots pump under a multi-stress environment, comprising the following steps:

[0018] First, according to the actual test requirements, configure the number of test branches and the number of Roots pumps in each test branch.

[0019] Then, according to the test objectives, set the pressure of the gas storage tank, the speed of each stage pump, the flow rate of gas in the circulation pipeline, the required particle concentration and particle size distribution.

[0020] Then, through the particle injection tank and the particle diversion main and branch lines, the particle-containing gas with set concentration and particle size distribution is accurately injected into the gas circulation system, and the particle concentration load of different branches can be independently adjusted through the stop valves of each particle branch line.

[0021] Subsequently, the gas storage tank and the pumps at each stage of the test branch are turned on to drive the gas carrying particles to flow through the pumps at each stage in the test branch in sequence, thus achieving continuous operation simulating complex working conditions.

[0022] After being acted upon by pumps at various levels, the gas merges through the reflux pipeline and flows to the particle filter device. The particles in the gas are efficiently filtered and recovered by the particle recovery device, realizing the recycling of the particles. The filtered gas returns to the gas storage tank through the gas recovery pipeline, completing the closed loop of the circulation system.

[0023] During the entire test process, the multi-parameter monitoring platform collects and records key operating parameters in real time through various sensors.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The device of the present invention can flexibly configure a combination of multiple pumps in parallel or series to adapt to different test requirements, and supports collaborative testing of multiple pump groups and simulation of large flow conditions. The particle injection tank can adjust the particle concentration in the pipeline, adapt to typical loads of metallurgical processes such as VD, VOD, and RH, and can reproduce extreme particle-containing conditions. The multi-parameter monitoring system is used to continuously monitor the key performance indicators of the Roots pump, such as the pumping rate, front and rear pressure difference, temperature rise, vibration, and particle concentration, and automatically record the changes in various parameters. The test device of the present invention, combined with life criteria (such as decreased pumping performance, abnormal pressure difference, seal failure, etc.), can support the inductive analysis of life distribution laws under multiple stress conditions, and efficiently carry out accelerated degradation tests and quantitative evaluation of equipment performance degradation processes.

[0026] The device of the present invention can truly restore typical industrial working conditions such as high particle concentration, high temperature and complex load fluctuations, significantly improving the authenticity and applicability of the accelerated degradation test of Roots pumps; supports multi-stress combined loading and real-time monitoring of multiple parameters, realizing a comprehensive dynamic analysis of equipment performance degradation and failure process; provides complete data acquisition, storage and visualization means, and provides a rich and reliable experimental basis for life modeling and failure mechanism analysis; the device structure is flexible and compatible with Roots pumps of different specifications and combinations, adapting to diverse industrial application scenarios; provides important experimental basis and data support for the selection, maintenance strategy formulation, life prediction and product technology upgrade of Roots pumps, and has broad engineering application prospects and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the device according to the embodiment of the present invention.

[0028] Figure 2 、 Figure 3 、 Figure 4 It is a partial schematic diagram of a device according to an embodiment of the present invention.

[0029] In the figure, 1-multi-parameter monitoring platform, 2-fourth-stage pump-screw pump, 3-tertiary pump-air-cooled Roots pump, 4-secondary pump-air-cooled Roots pump, 5-main pump-Roots pump, 6-particle injection tank, 7-particle diversion main line, 8-gas diversion main line, 9-gas tank pressure controller, 10-test device base, 11-gas tank, 12-gas recovery line, 13-particle branch line stop valve, 14-gas branch line stop valve, 15-particle concentration detector, 16-inlet flow meter, 17-temperature sensor, 18-pressure controller, 19-pneumatic butterfly valve, 20-particle filter device, 21-outlet flow meter, 22-reflux line, 23-particle recovery device. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following embodiments. Equivalent improvements made by ordinary technicians in the technical field without departing from the principle of the present invention should be included in the scope of protection of the present invention.

[0031] To address the shortcomings of existing technologies, this paper presents an innovative accelerated degradation test device for Roots pumps. This device accurately simulates the multi-stress environments experienced by Roots pumps in actual service, including complex operating conditions such as high particle concentrations, high temperatures, variable loads, and pressure fluctuations, truly recreating their actual operating conditions in industrial settings.

[0032] The core purpose of this invention is to deeply explore the performance degradation and failure modes of Roots pumps under typical industrial conditions by simulating complex, multi-stress environments such as high particle concentrations, high temperatures, and frequent load fluctuations. This allows for scientific reliability evaluation and lifespan prediction of Roots pumps throughout their lifecycle. The device can be widely used in fields such as metallurgy and chemical engineering that require high-flow vacuum systems, providing technical support for the design optimization, operation and maintenance, and lifespan management of related equipment.

[0033] The Roots pump accelerated degradation test device designed in this invention not only fills a gap in domestic research on accelerated degradation testing of vacuum pumps under complex operating conditions, but also provides strong support for improving the reliability and service life of Roots pumps, reducing equipment maintenance costs, and ensuring the safe and efficient operation of key processes in metallurgy and chemical engineering. This research has important academic value and practical application significance.

[0034] An accelerated degradation test device for a Roots pump comprises: a plurality of test branches, a test base 10, a gas storage tank 11, a particle injection tank 6, a gas circulation pipeline, a particle filtering and collecting device and a multi-parameter monitoring system.

[0035] The test branch is fixed to a test base 10 and includes several Roots pumps and a screw pump 2 connected in sequence. A gas storage tank 11 is mounted at one end of the test base 10 and connected to the inputs of the various test branches via gas circulation pipelines, providing a circulating drive gas source for the test process. The gas circulation pipeline between the gas storage tank 11 and the test branches is also connected to a particle injection tank 6, which stores and injects particles with a controllable concentration and size distribution. The output of the test branch is connected to a particle filter and collection device via the gas circulation pipeline. The multi-parameter monitoring system includes multiple sensors installed in the gas circulation pipeline and a multi-parameter monitoring platform 1 for receiving sensor data. After thorough mixing with the circulating gas, the particles are then efficiently filtered and recovered by the particle filter and collection device for reuse.

[0036] The gas circulation pipeline includes a gas diversion main pipeline 8 , a particle diversion main pipeline 7 , a connecting gas pipeline in the test branch, a reflux pipeline 22 and a gas recovery pipeline 12 .

[0037] The output end of the gas storage tank 11 is connected to the gas diversion main line 8, and the gas output from the gas storage tank is diverted through the gas diversion main line 8 and input into each test branch respectively. The connection part between the gas diversion main line 8 and each test branch is respectively provided with a gas branch line stop valve 14 for controlling the transmission of all gases in the current branch.

[0038] The output end of the particle injection tank 6 is connected to the particle diversion main line 7, and the gas containing particles is diverted through the particle diversion main line 7 and then input into each test branch respectively. The connection part between the particle diversion main line 7 and each test branch is respectively provided with a particle branch line stop valve 13, and the particle branch line stop valve 13 is arranged before the gas branch line stop valve 14 to adjust and control the particle concentration in the gas flowing through each pump, so as to realize the simulation of multi-stage working conditions.

[0039] The sensors of the multi-parameter monitoring system include a particle concentration detector 15 , an inlet flow meter 16 , a temperature sensor 17 , a pressure sensor 18 and an outlet flow meter 21 .

[0040] A particle concentration detector 15 and an inlet flow meter 16 are also provided on the pipeline between the input end of the main pump-Roots pump 5 in the test branch and the corresponding gas branch stop valve 14; the particle concentration detector 15 is used to dynamically monitor the particulate matter concentration in the circulating gas to achieve accurate feedback of the particle concentration load; the inlet flow meter 16 is used to monitor the incoming gas flow in real time; a pressure sensor 18 and a temperature sensor 17 are provided on the input pipeline of each stage of the pump, which are used to monitor the pressure and temperature changes during the operation of the pump group in real time, and the pumps at each stage are connected by a gas pipeline; the output end of the tertiary pump-Roots pump 3 is connected to the input end of the screw pump 2; the output end of the screw pump 2 is provided with an outlet flow meter 21, and the output end of the screw pump 2 of different test branches is connected to the corresponding input end of the return pipeline 22, and the merged gas is input into the particle filtering and collecting device through the output end of the return pipeline 22.

[0041] The particle filter collection device includes a particle filter device 20 and a particle recovery device 23. The particle filter device 20 filters the combined gas for particles and then transmits the particles back to the gas storage tank 11 through the gas recovery pipeline 12. At the same time, the filtered particles are recovered by the particle recovery device 23.

[0042] In one possible embodiment, the device further includes a pneumatic butterfly valve 19 installed in pipeline sections requiring isolation for maintenance. For example, pneumatic butterfly valve 19 is disposed on the output pipeline of the tertiary pump (Roots pump 3) and the input pipeline of the screw pump 2. Pneumatic butterfly valve 19 is used to be closed manually or through the control system when the device is shut down for maintenance or component replacement to isolate the specific pipeline or equipment section, prevent gas or particle leakage, and ensure the safety and convenience of maintenance operations.

[0043] In one possible implementation, the multi-parameter monitoring system collects the pressure, temperature, flow rate, and particle concentration of key nodes in each test branch in real time through the installed sensors, and transmits them to the multi-parameter monitoring platform 1; all the above sensors are connected to the multi-parameter monitoring platform 1 through buses such as RS485, and the multi-parameter monitoring platform 1 stores and displays the collected sensor data, realizing real-time visualization of parameters and traceability comparison of historical data, which is convenient for subsequent life modeling and degradation analysis.

[0044] To facilitate those skilled in the art to understand and implement the present invention, the operation of the device and the experimental process of the present invention are further described in detail with reference to the drawings and embodiments, but the scope of protection of the present invention is not limited to the following description.

[0045] The device supports multiple stress loading levels, such as speeds of 1000, 2000, and 3000 rpm, and particle concentrations of 200, 400, and 600 mg / m³. Parameters can be adjusted individually or combined. Test cycles and operating mode switching are fully controlled and automated, covering typical application environments in industries such as metallurgy and chemical engineering. It supports parallel testing of multiple pumps, making it suitable for studying pump reliability and degradation patterns.

[0046] During operation, the pressure in the gas storage tank 11, the rotational speeds of the various pumps, the gas flow rate in the circulation pipeline, and the desired particle concentration and size distribution are first set according to the test objectives. Particle-laden gas with the desired concentration and size distribution is precisely injected into the gas circulation system via the particle injection tank 6, the main particle diversion pipeline 7, and its branch pipelines. The particle concentration load in each branch is independently adjusted using the shutoff valves 13. Subsequently, the pumps in the gas storage tank 11 and the test branch are activated, driving the gas carrying particles through the main pump (Roots pump 5), the secondary pump (Roots pump 4), the tertiary pump (Roots pump 3), and the screw pump 2, achieving continuous operation simulating the complex operating conditions of actual industrial production, such as high particle concentration, high load, and pressure fluctuations. After being acted upon by the various pumps, the gas is combined through the return pipeline 22 and flows to the particle filtration device 20. Particles in the gas are efficiently filtered and recovered by the particle recovery device 23, enabling particle recycling. The filtered gas then returns to the gas storage tank 11 through the gas recovery pipeline 12, completing the closed-loop circulation system.

[0047] During the entire test process, the multi-parameter monitoring platform 1 collects and records key operating parameters such as pressure, temperature, gas flow rate and particle concentration at the inlet and outlet of the main pump and each level of pumps in real time. All collected data is synchronously transmitted to the multi-parameter monitoring platform 1 through a digital interface to facilitate data storage, trend analysis and abnormal warning of the entire process. As the test continues, the performance status of the pump is evaluated, and the performance degradation and life status of the equipment are judged based on changes in indicators such as pumping rate, energy consumption, temperature rise, and vibration. When signs of performance degradation such as decreased pumping speed, abnormal energy consumption or excessive temperature rise are detected in the pump group, it can be considered that the pump has reached the end of its life criterion. After the test, life distribution statistics and failure mechanism analysis can be carried out based on the recorded data to provide a scientific basis for the reliability evaluation and engineering application of the pump group.

[0048] The Roots pump accelerated degradation test device described in this invention can realistically reproduce the multi-stress environment of actual operating conditions. Through high-precision, multi-parameter, full-process automatic monitoring and data analysis, it provides a powerful testing platform for Roots pump life modeling, failure mechanism analysis, and engineering reliability evaluation. The device's modular structure, flexible parameter adjustment, and strong adaptability can meet the experimental requirements of various Roots pump types and specifications, demonstrating excellent engineering practicality and potential for widespread adoption.

[0049] Example

[0050] To further illustrate the technical solution of the present invention, a typical embodiment of the present invention is provided with reference to the accompanying drawings and specific parameters, but the present invention is not limited to the following contents.

[0051] This embodiment provides a Roots pump accelerated degradation test device such as Figures 1 to 4 As shown, it includes a multi-parameter monitoring platform 1, a four-stage pump-screw pump 2, a three-stage pump-air-cooled Roots pump 3, a two-stage pump-air-cooled Roots pump 4, a main pump-Roots pump 5, a particle injection tank 6, a particle diversion main line 7, a gas diversion main line 8, a gas tank pressure controller 9, a test device base 10, a gas tank 11, a gas recovery line 12, a particle branch line stop valve 13, a gas branch line stop valve 14, a particle concentration detector 15, an inlet flow meter 16, a temperature sensor 17, a pressure controller 18, a pneumatic butterfly valve 19, a particle filter device 20, an outlet flow meter 21, a reflux line 22, and a particle recovery device 23.

[0052] In this embodiment, four test branches are arranged at equal intervals on the base 10 of the test device. Each test branch includes a main pump-Roots pump 5, a secondary pump-Roots pump 4, a tertiary pump-Roots pump 3 and a screw pump 2. Each test branch must be equipped with a screw pump 2. The number of Roots pumps can be flexibly configured according to actual test requirements, but must not be less than two. Each pump is connected end to end through a gas circulation pipeline to form a closed circulation loop. A particle concentration detector 15 and an inlet flow meter 16 are also provided on the pipeline between the input end of the main pump-Roots pump 5 and the corresponding gas branch stop valve 14. A pressure controller 18 and a temperature sensor 17 are arranged on the input pipeline of each stage of the pump for real-time monitoring of the gas state. The output end of the tertiary pump-Roots pump 3 is connected to the input end of the screw pump 2, and the output end of the screw pump 2 is provided with an outlet flow meter 21. The output end of the gas storage tank 11 is connected to the gas diversion main line 8, which diverts the gas output from the gas storage tank 11 through the gas diversion main line 8 and inputs each test branch respectively. The connection between the gas diversion main line 8 and each test branch is respectively provided with a gas branch line stop valve 14, which is used to control the transmission of all gases in the current branch. The particle injection tank 6 injects particle-containing gas of preset concentration and particle size into the inlet side of each main pump-Roots pump through the particle diversion main line 7 and several particle branch lines. The connection between the particle diversion main line 7 and each test branch is respectively provided with a particle branch line stop valve 13. The particle concentration can be adjusted by the particle branch line stop valve 13 and monitored in real time by the particle concentration detector 15 to ensure the accuracy and controllability of the test conditions. The output end of the screw pump 2 of different test branches is connected to the corresponding input end of the return line 22, and the gas after confluence is input into the particle filtration collection device through the output end of the return line 22.

[0053] During the experiment, gas was first supplied to the system from a gas storage tank 11, which was then evenly distributed to each pump stage via the main gas diversion line 8 and the gas branch line shut-off valve 14. After the particle injection tank 6 was activated, the particle concentration was input according to the different experimental design conditions. The particle concentration was set by adjusting the valve core opening of the particle branch line shut-off valve 13 and using a particle concentration detector 15 (e.g., 200 mg / m³, 400 mg / m³, 600 mg / m³, etc.). Particle-laden gas was precisely injected into each test branch. After mixing, the gas and particles passed through the main pump (Roots pump 5), the secondary pump (Roots pump 4), the tertiary pump (Roots pump 3), and the screw pump 2, completing the simulation of the accelerated degradation of the Roots pump under high particle concentration, high flow rate, and multi-stage pressure conditions. After the circulating gas passes through the outlet flow meter 21 to measure the flow rate, it is combined through the reflux pipe 22 and filtered and purified by the particle filter device 20. The filtered particles are recovered by the particle recovery device 23, and the filtered gas returns to the gas storage tank 11 through the gas recovery pipe 12 to realize the system closed loop.

[0054] The multi-parameter monitoring platform 1 uses RS485 signal acquisition technology to collect real-time data such as particle concentration, inlet and outlet flow rates, pressure, and temperature, and simultaneously records and stores this data for subsequent lifespan analysis and performance degradation studies. During the test, different speeds (e.g., 1000 rpm, 2000 rpm, 3000 rpm, etc.) and pressure conditions can be set according to actual needs, enabling multi-stress loading, cyclic switching, and long-term operation. Real-time monitoring of pump operating parameters and abnormality alarms enable timely detection of pump performance degradation. When predetermined lifespan criteria are reached (such as decreased pumping speed, increased energy consumption, or localized temperature rise exceeding a limit), the test is terminated and relevant data is extracted for lifespan statistics and failure mechanism analysis.

[0055] As a preferred embodiment of the present invention, in order to further enrich the data acquisition and status monitoring functions of the device, the present invention also takes into account the collection and analysis of vibration signals of the pump group and its key parts during design. For the collection of vibration signals, in addition to reserving the sensor interface when designing the device structure, portable vibration sensors can be temporarily arranged on the test device or the surface of the pump body by pasting or adsorption, etc., according to actual test needs, so as to realize flexible collection of vibration data during the operation of the pump. The obtained vibration signal can be synchronously input into a multi-parameter monitoring platform or an independent data acquisition device for subsequent performance degradation analysis and fault diagnosis. The present invention is not limited to a fixed arrangement. Any solution that can realize the collection and analysis of the vibration signal of the device falls within the scope of protection of the present invention.

[0056] This embodiment effectively realizes the comprehensive accelerated degradation test of the life and performance of the Roots pump under complex working conditions, can truly reflect the service degradation process under the multi-stress environment of the industrial site, and provides strong experimental support for the reliability improvement, life prediction and product optimization design of the Roots pump.

[0057] It should be noted that the above embodiments are merely illustrative of the technical principles and applications of the present invention and do not constitute a limitation on the scope of protection of the present invention. Those skilled in the art may, without departing from the spirit and substance of the present invention, make various equivalent substitutions, adjustments, and improvements to the technical solutions of the present invention, all of which shall be encompassed within the scope of protection of the present invention. The present invention is intended to promote continuous innovation and development in the field of vacuum equipment reliability testing, and its scope of protection shall be subject to the appended claims.

Claims

1. A Roots pump accelerated degradation test device under multi-stress environment, characterized in that: include: Several test branches, test bases, gas storage tanks, particle injection tanks, gas circulation pipelines, particle filtration and collection devices, and multi-parameter monitoring systems; The test branch is fixedly arranged on the test base, and the test branch includes several Roots pumps and screw pumps connected in sequence; the gas storage tank is arranged at one end of the test base, and the gas storage tank is connected to the input ends of different test branches through gas circulation pipelines; the gas circulation pipeline between the gas storage tank and the test branch is also connected to a particle injection tank; the output end of the test branch is connected to the particle filtering and collecting device through a gas circulation pipeline; the multi-parameter monitoring system includes a plurality of sensors arranged in the gas circulation pipeline and a multi-parameter monitoring platform for receiving sensor data.

2. The accelerated degradation test device for Roots pumps under multi-stress environments according to claim 1, characterized in that: The output end of the gas storage tank is connected to the gas diversion main line, and the gas output from the gas storage tank is diverted through the gas diversion main line and then input into each test branch respectively. The connection part between the gas diversion main line and each test branch is respectively provided with a gas branch line stop valve for controlling the transmission of all gases in the current branch.

3. The accelerated degradation test device for Roots pumps under multi-stress environments according to claim 2, characterized in that: The output end of the particle injection tank is connected to the particle diversion main line, and the gas containing particles is diverted through the particle diversion main line and then input into each test branch respectively. The connection part between the particle diversion main line and each test branch is respectively provided with a particle branch line stop valve for controlling the transmission of the gas containing particles in the current branch, and the particle branch line stop valve is arranged before the gas branch line stop valve.

4. The accelerated degradation test device for Roots pumps under multi-stress environments according to claim 1, characterized in that: The sensors of the multi-parameter monitoring system include a particle concentration detector, an inlet flow meter, a pressure sensor, a temperature sensor and an outlet flow meter.

5. The accelerated degradation test device for Roots pumps under multi-stress environments according to claim 4, characterized in that: A particle concentration detector and an inlet flow meter are also provided on the pipeline between the input end of the main pump-Roots pump in the test branch and the corresponding gas branch stop valve; a pressure sensor and a temperature sensor are provided on the input pipeline of each stage of the pump, and the pumps at each stage are connected through a gas pipeline; the output end of the last stage of the Roots pump is connected to the input end of the screw pump; the output end of the screw pump is provided with an outlet flow meter, and the output ends of the screw pumps in different test branches are connected to the corresponding input ends of the return pipeline, and the merged gas is input into the particle filtering and collecting device through the output end of the return pipeline.

6. The accelerated degradation test device for Roots pumps under multi-stress environments according to claim 5, characterized in that: The particle filter collection device includes a particle filter device and a particle recovery device. The particle filter device filters the particles of the merged gas and then transmits them to the gas storage tank through the gas recovery pipeline. At the same time, the filtered particles are recovered by the particle recovery device.

7. The accelerated degradation test device for Roots pumps under multi-stress environments according to claim 1 or 4, characterized in that: The multi-parameter monitoring system collects the pressure, temperature, flow rate and particle concentration of key nodes in each test branch in real time through the installed sensors, and transmits them to the multi-parameter monitoring platform; the collected sensor data is stored and displayed through the multi-parameter monitoring platform, realizing real-time visualization of parameters and traceability comparison of historical data.

8. The accelerated degradation test device for Roots pumps under multi-stress environments according to claim 1, characterized in that: The device also includes a pneumatic butterfly valve installed in the pipeline section that needs to be isolated for maintenance, which is used to close when the device is shut down for maintenance or component replacement to isolate the specific pipeline or equipment section and prevent gas or particle leakage.

9. The accelerated degradation test device for Roots pumps under multi-stress environments according to claim 1, characterized in that: The multi-parameter monitoring system further comprises a vibration sensor, which is arranged at the monitoring position of each level of pump according to requirements.

10. A method for accelerating degradation testing of Roots pumps under multi-stress environments, characterized in that: The steps are as follows: First, configure the number of test branches and the number of Roots pumps in each test branch according to actual test requirements; Then, according to the test objectives, the pressure of the gas storage tank, the speed of each pump, the flow rate of the gas in the circulation pipeline, the required particle concentration and particle size distribution are set; Then, through the particle injection tank and the particle diversion main and branch lines, the particle-containing gas with the set concentration and particle size distribution is accurately injected into the gas circulation system, and the particle concentration load of different branches can be independently adjusted through the stop valves of each particle branch line; Subsequently, the gas storage tank and the pumps at each stage of the test branch are turned on, driving the gas carrying particles to flow through the pumps at each stage of the test branch in sequence, achieving continuous operation simulating complex working conditions; After being acted upon by pumps at all levels, the gas flows through the return pipe and then merges to the particle filter device. The particles in the gas are efficiently filtered and recovered by the particle recovery device, thus achieving the recycling of particles. The filtered gas returns to the gas storage tank through the gas recovery pipe, completing the closed loop of the circulation system. During the entire test process, the multi-parameter monitoring platform collects and records key operating parameters in real time through various sensors.

Images