A hydraulic three-screw pump fault simulation injection test system

Abstract

The present invention provides a hydraulic three-screw pump fault simulation injection test system, which belongs to the technical field of screw pump testing. The system includes a test device and a data acquisition sensor. One end of an inlet pipe is connected to an oil storage tank, and the other end of the inlet pipe is connected to an inlet of the three-screw pump. A motor is arranged above the three-screw pump, one end of an outlet pipe is connected to an outlet of the three-screw pump, and the other end of the outlet pipe is connected to a liquid inlet of a heat exchanger. The liquid outlet of the heat exchanger is connected to one end of a return pipe, and the other end of the return pipe is connected to the oil storage tank. Data acquisition sensors are respectively installed on the three-screw pump and the motor. The system realizes common fault simulation and feature acquisition and identification of the three-screw pump by adjusting the installation and operating status of the three-screw pump and replacing fault simulation components, and grasps the performance changes and vibration characteristic parameters of the three-screw pump under typical faults, thereby forming a standard for fault diagnosis and identification of the three-screw pump.

Description

Technical Field

[0001] The invention belongs to the technical field of screw pump testing, and in particular relates to a hydraulic three-screw pump fault simulation injection test system. Background Art

[0002] The three-screw pump is a typical positive displacement fluid machine used to transport oils and high-viscosity liquids. It boasts low pressure pulsation, stable performance, and excellent self-priming properties. It is the primary drive for a ship's lubricating oil system and plays a crucial role in the stable operation of the entire ship's electromechanical system. Ensuring the stable and efficient operation of three-screw pumps is also a crucial component of modern ship maintenance. Currently, the diagnosis of three-screw pump fault characteristics is generally based on changes in energy performance parameters such as flow rate, pressure, and oil temperature. However, relatively little research has been conducted on the vibration characteristics of three-screw pump faults, and most studies have focused on the mechanism of the problem. The proposed experimental schemes lack real-time performance and still rely on traditional manual parameter adjustment methods. Research on fault signal acquisition and diagnosis methods still focuses on diagnosing the three-screw pump's operating conditions under specific conditions. There is no engineering approach to identifying the fault characteristics of three-screw pumps, nor is a standard for identifying three-screw pump faults established, making it impossible to predict faults during operation. Summary of the Invention

[0003] An embodiment of the present invention provides a hydraulic three-screw pump fault simulation injection test system. By adjusting the installation and operating status of the three-screw pump and replacing fault simulation components, common fault simulation and feature collection and identification of the three-screw pump are realized, and the performance changes and vibration characteristic parameters of the three-screw pump under typical faults are mastered, thereby forming a standard for three-screw pump fault diagnosis and identification.

[0004] In view of the above problems, the technical solution proposed by the present invention is:

[0005] The present invention provides a hydraulic three-screw pump fault simulation injection test system, comprising a test device and a data acquisition sensor, wherein the test device comprises an oil storage tank, an inlet pipe, a three-screw pump, an outlet pipe, a bypass pipe, a heat exchanger, a return pipe, a power distribution cabinet and a control cabinet;

[0006] One end of the inlet pipe is connected to the oil storage tank, and the other end of the inlet pipe is connected to the inlet of the three-screw pump. A motor is provided above the three-screw pump, and the output shaft of the motor is fixedly connected to the driving shaft of the three-screw pump. A base is provided on one side of the three-screw pump, and four shock absorbers are symmetrically provided on the base. The motor is fixedly connected to the shock absorber, the input end of the motor is electrically connected to the output end of the control cabinet, one end of the outlet pipe is connected to the outlet of the three-screw pump, the heat exchanger is provided with two, and each of the same type of pipe orifices is connected in parallel, the other end of the outlet pipe is connected to the liquid inlet of the heat exchanger, the liquid outlet of the heat exchanger is connected to one end of the return pipe, and the other end of the return pipe is connected to the oil storage tank, one end of the bypass pipe is connected to the middle part of the outlet pipe through a tee, and the other end of the bypass pipe is connected to the middle part of the return pipe through a tee;

[0007] The data acquisition sensors are respectively installed on the three-screw pump and the motor.

[0008] As a preferred technical solution of the present invention, a heater is provided on one side of the oil storage tank, two temperature sensors are respectively provided on both sides of the oil storage tank, a liquid level gauge is provided on one side of the oil storage tank, and an air filter is provided on the top of the oil storage tank.

[0009] As a preferred technical solution of the present invention, a first stop valve, a first soft connection, a pre-filter, a first pressure gauge and a second stop valve are sequentially arranged on the inlet pipe along the direction of liquid flow. The pre-filter adopts a <-type filter. A first liquid receiving pan is arranged below the pre-filter, and a second liquid receiving pan is arranged below the three-screw pump.

[0010] As a preferred technical solution of the present invention, a third stop valve, a safety valve, a second pressure gauge, a fourth stop valve and a fifth stop valve are sequentially arranged on the outlet pipe along the direction of liquid flow, an oil barrel is provided on one side of the three-screw pump, the discharge port of the safety valve is connected to the top of the oil barrel, the connection between the bypass pipe and the outlet pipe is provided between the fourth stop valve and the fifth stop valve, a pipe rack is provided below the outlet pipe, the outlet pipe and the pipe rack are fixedly connected by a clamp, a sixth stop valve is provided on the bypass pipe, the second pressure gauge is an electronic pressure gauge, and the output end of the electronic pressure gauge is electrically connected to the input end of the control cabinet.

[0011] As a preferred technical solution of the present invention, the liquid inlet and liquid outlet of the heat exchanger are both provided with a second flexible connection and a third flexible connection, the second flexible connection is connected to the outlet pipe, and the third flexible connection is connected to the return pipe. A cooling water supply pipe and a cooling water return pipe are respectively provided on both sides of the heat exchanger, and the other ends of the cooling water supply pipe and the cooling water return pipe are connected to the cooling system.

[0012] As a preferred technical solution of the present invention, a flow meter is provided on the return pipe, a connecting tee between the bypass pipe and the return pipe is provided near the inlet end of the flow meter, a bracket is provided on one side of the flow meter, the output end of the flow meter is electrically connected to the input end of the control cabinet, and a seventh shut-off valve is provided at one end of the return pipe near the oil storage tank.

[0013] As a preferred technical solution of the present invention, there are eight data acquisition sensors, three of which are installed on the surface of the motor and are respectively arranged in the horizontal direction of the non-driving end of the motor, the horizontal direction of the driving end and the axial direction of the driving end. The other five are installed on the surface of the three-screw pump and are respectively arranged in the horizontal direction of the outlet end, the axial direction of the outlet end, the horizontal direction of the inlet end and the axial direction of the inlet end of the three-screw pump. Two are arranged in the horizontal direction of the outlet end, and the two are arranged at a 90° angle.

[0014] As an optimal technical solution of the present invention, the three-screw pump fault simulation injection test includes fastener loosening, pump cavitation, coupling failure, centering deviation and bearing failure. The fault simulation is achieved by adjusting the installation and operating status of the three-screw pump or replacing the faulty parts.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The test device has a complete process. The circulation loop between the three-screw pump and the oil storage tank is connected by the inlet and outlet pipes. The pipeline is equipped with various functional valves. The medium path is clear and the hydraulic operating environment under the simulated working conditions is restored. It is safe and reliable. In addition, the outlet of the three-screw pump is also connected to a heat exchanger to ensure the hydraulic oil temperature and extend the life of the test device.

[0017] (2) The test system is equipped with sensors on the three-screw pump device. By adjusting the installation and operating status of the three-screw pump and replacing the fault simulation components, the common fault simulation and feature collection and identification of the three-screw pump are realized. The performance changes and vibration characteristic parameters of the three-screw pump under several typical faults such as loose fasteners, pump cavitation, coupling failure, centering deviation and bearing failure are mastered, thereby forming a standard for the diagnosis and identification of three-screw pump faults.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a hydraulic three-screw pump fault simulation injection test system disclosed in the present invention;

[0020] Figure 2 This is a structural schematic diagram from another perspective of a hydraulic three-screw pump fault simulation injection test system disclosed in the present invention;

[0021] Figure 3 This is a schematic top view of the structure of a hydraulic three-screw pump fault simulation injection test system disclosed in the present invention;

[0022] Figure 4 It is a schematic diagram of the distribution structure of the data acquisition sensor disclosed in the present invention;

[0023] Explanation of reference numerals: 10, test device; 100, oil storage tank; 101, heater; 102, temperature sensor; 103, liquid level gauge; 104, air filter; 200, inlet pipe; 201, first stop valve; 202, first flexible connection; 203, pre-filter; 204, first pressure gauge; 205, second stop valve; 206, first liquid receiving tray; 300, three-screw pump; 301, motor; 302, base; 303, shock absorber; 304, second liquid receiving tray; 400, outlet pipe; 401, third stop valve Check valve; 402, safety valve; 4021, oil drum; 403, second pressure gauge; 404, fourth stop valve; 405, fifth stop valve; 406, pipe rack; 500, bypass pipe; 501, sixth stop valve; 600, heat exchanger; 601, second flexible connection; 602, third flexible connection; 603, cooling water supply pipe; 604, cooling return pipe; 700, return pipe; 701, flow meter; 7011, bracket; 702, seventh stop valve; 800, power distribution cabinet; 900, control cabinet; 20, data acquisition sensor. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0029] Example

[0030] Refer to the attached Figure 1-3 As shown, the present invention provides a technical solution: a hydraulic three-screw pump fault simulation injection test system, including a test device 10 and a data acquisition sensor 20. The test device 10 includes an oil storage tank 100, an inlet pipe 200, a three-screw pump 300, an outlet pipe 400, a bypass pipe 500, a heat exchanger 600, a return pipe 700, a distribution cabinet 800 and a control cabinet 900. The test device 10 is constructed through a physical entity structure to simulate and restore the hydraulic operating environment of the three-screw pump 300 under the working conditions. It is safe and reliable, and the test effect is obvious.

[0031] One end of the inlet pipe 200 is connected to the oil storage tank 100, and the other end of the inlet pipe 200 is connected to the inlet of the three-screw pump 300. A motor 301 is provided above the three-screw pump 300. The output shaft of the motor 301 is fixedly connected to the driving shaft of the three-screw pump 300. The motor 301 provides driving force for the three-screw pump 300, so that the medium in the cavity of the three-screw pump 300 is pressurized and pushed from the inlet to the outlet. A base 302 is provided on one side of the three-screw pump 300, and four shock absorbers 30 are symmetrically provided on the base 302. 3. The motor 301 is fixedly connected to the shock absorber 303, and the base 302 is bolted to the test platform. The shock absorber 303 reduces the resonance between the motor 301 and the base 302, providing conditions for the stable operation of the motor 301. The input end of the motor 301 is electrically connected to the output end of the control cabinet 900. The start and stop of the motor 301 is provided by the control cabinet 900 with a command signal, which is convenient for the staff to operate. One end of the outlet pipe 400 is connected to the outlet of the three-screw pump 300, and the three-screw pump 300 pumps the oil through the inlet pipe 200. The hydraulic oil in the oil storage tank 100 is sucked and then discharged from the outlet pipe 400. Two heat exchangers 600 are provided, and each of the same type of pipe ports is connected in parallel. The other end of the outlet pipe 400 is connected to the liquid inlet of the heat exchanger 600. The heat exchanger 600 is provided on the outlet pipe 400 to cool the hydraulic oil after passing through the three-screw pump 300 to prevent the hydraulic oil from being damaged by the pump body due to the temperature increase after the circulation and pressurization during the test. The outlet of the heat exchanger 600 is connected to one end of the return pipe 700. The return pipe 700 is connected to the return pipe 700. The other end of 00 is connected to the oil tank 100, and the return pipe 700 guides the cooled hydraulic oil back to the oil tank 100. One end of the bypass pipe 500 is connected to the middle of the outlet pipe 400 through a tee, and the other end of the bypass pipe 500 is connected to the middle of the return pipe 700 through a tee. The bypass pipe 500 is used to suspend the heat exchanger 600. When the hydraulic oil does not need to be cooled, the hydraulic oil in the outlet pipe 400 can be directly guided back to the oil tank 100 through the bypass pipe 500, saving energy consumption of the heat exchanger 600.

[0032] Refer to the attached Figure 4As shown, the data acquisition sensors 20 are respectively installed on the three-screw pump 300 and the motor 301. The data acquisition sensor 20 adopts an acceleration sensor for obtaining vibration acceleration signals. The data acquisition sensor 20 is electrically connected to the LAN interface of the data collector. The data collector is a single 16-channel data collector with a maximum sampling frequency of 128kHz. The data collector is electrically connected to the control cabinet 900. There are eight data acquisition sensors 20, three of which are installed on the surface of the motor 301 and are respectively arranged in the horizontal direction ① of the non-driving end of the motor 301, the horizontal direction ② of the driving end and the axial direction ③ of the driving end. The other five are installed on the surface of the three-screw pump 300 and are respectively arranged in the horizontal direction (④ and ⑤) of the outlet end of the three-screw pump 300, the axial direction ⑥ of the outlet end, the horizontal direction ⑦ of the inlet end and the axial direction ⑧ of the inlet end. There are two horizontal directions of the outlet end, and the two are arranged at a 90° angle, refer to the attached figure. Figure 4 As shown, the central axes of data acquisition sensors ①, ②, ④ and ⑦ are parallel to the Y-axis direction, the central axis of data acquisition sensor ⑤ is parallel to the X-axis direction, and the central axes of data acquisition sensors ③, ⑥ and ⑧ are parallel to the Z-axis direction. The layout positions and directions of the eight data acquisition sensors 20 are key monitoring points on the three-screw pump 300. During the fault simulation test, the vibration parameters of the three-screw pump 300 are effectively collected.

[0033] In addition, the control cabinet 900 is equipped with a server and data analysis software. The server uses an Intel 4G core processor, 16G memory, and a 500G hard drive. The data analysis software has functions such as time domain, frequency domain, standard spectrum, phase difference spectrum, frequency response function, acoustic analysis, envelope spectrum, resonance demodulation spectrum, order spectrum, cursor band function, correlation function, and system analysis. It provides software support for fault injection simulation tests, observes the time domain waveform of the vibration data of the three-screw pump 300 in normal and faulty states, and analyzes the sensor signal in the frequency domain to determine the sensitivity of the data acquisition sensor 20 to the fault state.

[0034] In an embodiment of the present invention, a heater 101 is provided on one side of the oil tank 100. The heater 101 is used to heat the hydraulic oil in the oil tank 100 so that the simulation experiment matches the actual working conditions. Two temperature sensors 102 are respectively provided on both sides of the oil tank 100. The temperature sensor 102 is used to detect the temperature of the hydraulic oil. The heater 101 and the temperature sensor 102 are both electrically connected to the control cabinet 900. The heater 101 is started and stopped by the signal of the temperature sensor 102 to keep the hydraulic oil in the oil tank 100 at a stable temperature. A liquid level gauge 103 is provided on one side of the oil tank 100. The liquid level gauge 103 adopts a magnetic flap type, which is convenient for observing the oil level in the oil tank 100. An air filter 104 is provided on the top of the oil tank 100. To ensure constant pressure, the oil tank 100 needs to be connected to the atmosphere. The air filter 104 is provided at the connecting port on the top of the oil tank 100 to filter impurities in the air and prevent contamination of the test hydraulic oil.

[0035] In an embodiment of the present invention, a first stop valve 201, a first soft connection 202, a pre-filter 203, a first pressure gauge 204 and a second stop valve 205 are sequentially arranged on the inlet pipe 200 along the direction of liquid flow. The first soft connection 202 facilitates the connection of the inlet pipe 200 and avoids the risk of leakage caused by misalignment of the connecting pipe due to processing errors. The first pressure gauge 204 is used to detect the vacuum degree in the inlet pipe 200 and provide data for the pump cavitation fault test. The pre-filter 203 adopts a Y-type filter. The pre-filter 203 is used to filter the hydraulic oil to prevent impurities in the oil from damaging the pump body of the three-screw pump 300. A first liquid receiving pan 206 is provided below the pre-filter 203, and a second liquid receiving pan 304 is provided below the three-screw pump 300. The two liquid receiving pans are arranged at locations that need to be disassembled frequently to prevent hydraulic oil from dripping and contaminating the platform floor.

[0036] In the embodiment of the present invention, the outlet pipe 400 is provided with a third stop valve 401, a safety valve 402, a second pressure gauge 403, a fourth stop valve 404 and a fifth stop valve 405 in sequence along the direction of liquid flow. An oil barrel 4021 is provided on one side of the three-screw pump 300. The discharge port of the safety valve 402 is connected to the top of the oil barrel 4021. The safety valve 402 plays a preventive and protective role. When the pressure in the outlet pipe 400 exceeds the limit, the pressure is released through the discharge port. The connection between the bypass pipe 500 and the outlet pipe 400 is provided at the fourth stop valve. Between the check valve 404 and the fifth stop valve 405, a pipe rack 406 is provided below the outlet pipe 400, and the outlet pipe 400 and the pipe rack 406 are fixedly connected by a clamp. A sixth stop valve 501 is provided on the bypass pipe 500. The second pressure gauge 403 adopts an electronic pressure gauge. The output end of the electronic pressure gauge is electrically connected to the input end of the control cabinet 900. The second pressure gauge 403 detects the pressure of the outlet pipe 400. During the simulation test, the pressure of the outlet pipe 400 is an important parameter data, and the electronic pressure gauge facilitates the recording work of the test system.

[0037] In an embodiment of the present invention, the liquid inlet and liquid outlet of the heat exchanger 600 are both provided with a second flexible connection 601 and a third flexible connection 602. The second flexible connection 601 is connected to the outlet pipe 400, and the third flexible connection 602 is connected to the return pipe 700. The second flexible connection 601 and the third flexible connection 602 make the installation of the heat exchanger 600 and the connection with the inlet and outlet pipes more convenient. A cooling water supply pipe 603 and a cooling return water pipe 604 are respectively provided on both sides of the heat exchanger 600. The other ends of the cooling water supply pipe 603 and the cooling return water pipe 604 are both connected to the cooling system. The cooling system provides a cooling source for the heat exchanger 600 and cools the hydraulic oil through counter-flow.

[0038] In an embodiment of the present invention, a flow meter 701 is provided on the return pipe 700, and a connecting tee between the bypass pipe 500 and the return pipe 700 is provided near the inlet end of the flow meter 701. A bracket 7011 is provided on one side of the flow meter 701. The output end of the flow meter 701 is electrically connected to the input end of the control cabinet 900. A seventh stop valve 702 is provided at one end of the return pipe 700 near the oil storage tank 100. The flow meter 701 is used to detect the flow rate of the reflux liquid and is also recorded as parameter data of the simulation test to provide data for the performance parameter changes of the fault simulation of the three-screw pump 300.

[0039] In an embodiment of the present invention, the fault simulation injection test of the three-screw pump 300 includes fastener loosening, pump cavitation, coupling failure, centering deviation and bearing failure. The fault simulation is achieved by adjusting the installation and operating status of the three-screw pump 300 or replacing the faulty parts. During the operation of the test device 10, the vibration parameters of the key parts of the three-screw pump 300 and the motor 301 are monitored and identified through the data acquisition sensor 20, and the simulated fault injection experiment of the three-screw pump 300 under typical faults such as fastener loosening, pump cavitation, coupling failure, centering deviation and bearing failure is completed. The faulty parts used for the fault simulation test all meet the test requirements for the performance, strength, appearance, etc. of product components, and are also applicable to the processing requirements of physical machine tools for materials.

[0040] Method for simulating a loose fastener failure in a three-screw pump: loosen the connecting bolts between the base 302 and the platform ground and the connecting bolts between the motor 301 and the base 302 to simulate a loose fastener failure, start the motor 301 to perform a fault simulation operation test, and gradually increase the pressure of the three-screw pump 300 at the rated speed until the second pressure gauge 403 detects that the rated discharge pressure reaches 5MPa and the bearing temperature is stable. The running time at the rated pressure point shall not be less than 10 minutes. The vibration acceleration of the pump group during this process is collected by the data acquisition sensor 20, and the operating parameters such as oil temperature and flow are recorded at the same time. After the test, shut down the three-screw pump 300, tighten the base 302 bolts and the motor 301 bolts, restore to normal state, and complete the fastener loose failure simulation test.

[0041] Method for simulating cavitation failure of three-screw pump: connect the air compressor air pipe to the inlet pipe 200, and introduce high-pressure air into the inlet pipe 200 to reduce the inlet vacuum of the pump group and the flow rate drop by more than 3% to simulate the pump cavitation failure. Turn on the motor 301 to perform a fault simulation operation test, so that the three-screw pump 300 is gradually increased in pressure at the rated speed until the second pressure gauge 403 detects that the rated discharge pressure reaches 5MPa and the bearing temperature is stable. The running time at the rated pressure point shall not be less than 10min. The vibration acceleration of the pump group during this process is collected by the data acquisition sensor 20, and the operating parameters such as the inlet vacuum, oil temperature, and flow rate are recorded at the same time. After the test, the three-screw pump 300 is shut down, the air pipe is pulled out and the air vent is closed to restore to normal state to complete the pump cavitation failure simulation test.

[0042] Method for simulating coupling failure of three-screw pump: replace the coupling in the three-screw pump 300 with a damaged coupling to simulate coupling failure, start the motor 301 to perform a fault simulation operation test, and make the three-screw pump 300 gradually increase the pressure at the rated speed until the rated discharge pressure detected by the second pressure gauge 403 reaches 5MPa and the bearing temperature is stable. The running time at the rated pressure point shall not be less than 10 minutes. The vibration acceleration of the pump group during this process is collected by the data acquisition sensor 20, and the operating parameters such as oil temperature and flow are recorded at the same time. After the test, the three-screw pump 300 is shut down, the damaged coupling is replaced, and the pump is restored to normal state to complete the coupling failure simulation test.

[0043] Method for simulating the misalignment fault of a three-screw pump: replace the coupling frame in the three-screw pump 300 with a special large-stop coupling frame to simulate a coupling fault, start the motor 301 to perform a fault simulation operation test, and gradually increase the pressure of the three-screw pump 300 at the rated speed until the rated discharge pressure detected by the second pressure gauge 403 reaches 5MPa and the bearing temperature is stable. The running time at the rated pressure point shall not be less than 10 minutes. The vibration acceleration of the pump group during this process is collected by the data acquisition sensor 20, and the operating parameters such as oil temperature and flow are recorded at the same time. After the test, shut down the three-screw pump 300, replace the special coupling frame, and restore to normal state to complete the misalignment fault simulation test.

[0044] Three-screw pump bearing failure simulation method: replace the bearing in the three-screw pump 300 with a bearing failure part with wear on the outer ring to simulate the bearing failure, start the motor 301 to perform a fault simulation operation test, and make the three-screw pump 300 gradually increase the pressure at the rated speed until the second pressure gauge 403 detects that the rated discharge pressure reaches 5MPa and the bearing temperature is stable. The rated pressure point operation time shall not be less than 10 minutes. The vibration acceleration of the pump group during this process is collected by the data acquisition sensor 20, and the operating parameters such as oil temperature and flow are recorded at the same time. After the test, the three-screw pump 300 is shut down, the bearing failure part is replaced, and the pump is restored to normal state to complete the bearing failure simulation test.

[0045] Through the above-mentioned fault simulation method, a data analysis engine was established. Under the same working conditions, signals of the hydraulic three-screw pump 300 were collected in normal conditions, loose fasteners, pump cavitation, coupling failure, centering deviation, bearing failure, etc. Sensors were used to collect monitoring signals under various fault conditions, and a preliminary analysis was carried out on them. In order to describe the time domain signal with a small amount of information and reflect its characteristics and essential properties, statistical feature quantities were used to characterize the information of the time domain signal. Finally, the data was classified through software algorithms to form a standard for fault diagnosis and identification of the three-screw pump 300.

[0046] It should be noted that the specific models and specifications of the heater 101, temperature sensor 102, motor 301, second pressure gauge 403, flow meter 701 and data acquisition sensor 20 need to be selected and determined based on the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0047] It should be noted that the power supply and principles of the heater 101, temperature sensor 102, motor 301, second pressure gauge 403, flow meter 701 and data acquisition sensor 20 are clear to those skilled in the art and will not be described in detail here.

[0048] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A hydraulic three-screw pump fault simulation injection test system, characterized in that: The test device (10) comprises a test apparatus (10) and a data acquisition sensor (20), wherein the test apparatus (10) comprises an oil storage tank (100), an inlet pipe (200), a three-screw pump (300), an outlet pipe (400), a bypass pipe (500), a heat exchanger (600), a return pipe (700), a power distribution cabinet (800), and a control cabinet (900); One end of the inlet pipe (200) is in communication with the oil storage tank (100), and the other end of the inlet pipe (200) is in communication with the inlet of the three-screw pump (300). A motor (301) is provided above the three-screw pump (300), and the output shaft of the motor (301) is fixedly connected to the driving shaft of the three-screw pump (300). A base (302) is provided on one side of the three-screw pump (300), and four shock absorbers (303) are symmetrically provided on the base (302). The motor (301) is fixedly connected to the shock absorber (303), and the input end of the motor (301) is electrically connected to the output end of the control cabinet (900). The outlet pipe (400) is connected to the outlet of the three-screw pump (300), two heat exchangers (600) are provided, and each of the same type of pipe openings is connected in parallel, the other end of the outlet pipe (400) is connected to the liquid inlet of the heat exchanger (600), the liquid outlet of the heat exchanger (600) is connected to one end of the return pipe (700), the other end of the return pipe (700) is connected to the oil storage tank (100), one end of the bypass pipe (500) is connected to the middle of the outlet pipe (400) through a tee, and the other end of the bypass pipe (500) is connected to the middle of the return pipe (700) through a tee; The data acquisition sensor (20) is respectively installed on the three-screw pump (300) and the motor (301); A heater (101) is provided on one side of the oil storage tank (100), two temperature sensors (102) are provided on both sides of the oil storage tank (100), a liquid level gauge (103) is provided on one side of the oil storage tank (100), and an air filter (104) is provided on the top of the oil storage tank (100); The outlet pipe (400) is provided with a third stop valve (401), a safety valve (402), a second pressure gauge (403), a fourth stop valve (404) and a fifth stop valve (405) in sequence along the liquid flow direction. An oil barrel (4021) is provided on one side of the three-screw pump (300). The discharge port of the safety valve (402) is communicated with the top of the oil barrel (4021). The connection between the bypass pipe (500) and the outlet pipe (400) is provided between the fourth stop valve (404) and the fifth stop valve (405). A pipe rack (406) is provided below the outlet pipe (400). The outlet pipe (400) and the pipe rack (406) are fixedly connected by a clamp. A sixth stop valve (501) is provided on the bypass pipe (500). The second pressure gauge (403) is an electronic pressure gauge. The output end of the electronic pressure gauge is electrically connected to the input end of the control cabinet (900). The three-screw pump (300) fault simulation injection test includes fastener loosening, pump cavitation, coupling failure, centering deviation and bearing failure, and the fault simulation is achieved by adjusting the installation and operation status of the three-screw pump (300) or replacing the faulty component.

2. A hydraulic three-screw pump fault simulation injection test system according to claim 1, characterized in that: A first stop valve (201), a first flexible connection (202), a pre-filter (203), a first pressure gauge (204) and a second stop valve (205) are sequentially arranged on the inlet pipe (200) along the liquid flow direction. The pre-filter (203) is a Y-type filter. A first liquid receiving tray (206) is arranged below the pre-filter (203). A second liquid receiving tray (304) is arranged below the three-screw pump (300).

3. A hydraulic three-screw pump fault simulation injection test system according to claim 1, characterized in that: The liquid inlet and liquid outlet of the heat exchanger (600) are both provided with a second flexible connection (601) and a third flexible connection (602), the second flexible connection (601) is connected to the outlet pipe (400), and the third flexible connection (602) is connected to the return pipe (700), and a cooling water supply pipe (603) and a cooling water return pipe (604) are respectively provided on both sides of the heat exchanger (600), and the other ends of the cooling water supply pipe (603) and the cooling water return pipe (604) are both connected to the cooling system.

4. A hydraulic three-screw pump fault simulation injection test system according to claim 1, characterized in that: A flow meter (701) is provided on the return pipe (700), a connecting tee between the bypass pipe (500) and the return pipe (700) is provided near the inlet end of the flow meter (701), a bracket (7011) is provided on one side of the flow meter (701), an output end of the flow meter (701) is electrically connected to an input end of the control cabinet (900), and a seventh stop valve (702) is provided at one end of the return pipe (700) near the oil storage tank (100).

5. A hydraulic three-screw pump fault simulation injection test system according to claim 1, characterized in that: The data acquisition sensors (20) are provided in eight forms, three of which are mounted on the surface of the motor (301) and are respectively arranged in the horizontal direction of the non-driving end, the horizontal direction of the driving end, and the axial direction of the driving end of the motor (301); the other five are mounted on the surface of the three-screw pump (300) and are respectively arranged in the horizontal direction of the outlet end, the axial direction of the outlet end, the horizontal direction of the inlet end, and the axial direction of the inlet end of the three-screw pump (300); two of which are provided in the horizontal direction of the outlet end, and the two are arranged at a 90° angle.

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