Fault diagnosis and detection device for cryogenic liquid pump

Abstract

The utility model provides a fault diagnosis and detection device for a cryogenic liquid pump, which can be used for installing a three-way acceleration sensor without damaging an equipment main body and ensuring the working temperature of the three-way acceleration sensor. The device comprises a three-way acceleration sensor and a control chip module, wherein the three-way acceleration sensor is connected with the control chip module; the device is characterized by further comprising a hoop base, an outer ring seat, an isolation working box, a heat insulation inner box and a resistance heating rod, the outer ring base is fixedly connected to the outer side of the hoop base in a sleeving mode. The isolation working box is fixed on the outer ring seat, and the control chip module is mounted in the isolation working box; the heat insulation inner box is fixedly installed in the isolation work box, and the three-way acceleration sensor is installed in the heat insulation inner box. The resistance heating rod is installed in the heat insulation inner box and connected with the control chip module.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for cryogenic liquid pumps, and specifically to a fault diagnosis and detection device for cryogenic liquid pumps. Background Technology

[0002] Cryogenic pumps (or cryogenic pumps for short) are specialized pumps used in petroleum, air separation, and chemical plants to transport cryogenic liquids (such as liquid oxygen, liquid nitrogen, liquid argon, liquid hydrocarbons, and liquefied natural gas). In air separation plants, they are mainly used to transport liquid products, such as liquid oxygen pumps, liquid nitrogen pumps, and liquid argon pumps. With the rapid modernization of my country's industry, the stable operation of large rotating equipment is crucial for enterprises with continuous production. A malfunction can cause the entire production line to shut down, resulting in significant losses, sometimes reaching hundreds of thousands of yuan per hour. Therefore, the safe operation of critical equipment increasingly relies on online fault prediction and diagnosis systems.

[0003] The wear and tear on components of cryogenic liquid pumps follows a predictable pattern during operation. By monitoring this wear and tear pattern, the relative movement trends of various components can reflect the interlocking effects of vibration and temperature, allowing for early detection of changes in equipment functions and their consequences. To ensure on-site safety and normal equipment operation, regular maintenance and inspection, as well as necessary predictive maintenance systems for equipment health monitoring, are crucial. This means that in addition to regular maintenance, it's essential to identify potential equipment problems early and install monitoring equipment without damaging the main structure of the equipment.

[0004] Existing technologies include using triaxial accelerometers to monitor equipment vibration and thus monitor equipment health status. However, cryogenic liquid pumps operate at very low temperatures, typically between -45°C and -160°C, while commonly used triaxial accelerometers for vibration monitoring operate at temperatures between -40°C and 120°C. The operating temperature of cryogenic liquid pumps cannot meet the operating temperature requirements of triaxial accelerometers. Furthermore, the installation of triaxial accelerometers usually involves drilling and tapping M5 threads directly on the surface of the equipment under test, which can affect the structural integrity of the equipment. The installation process is also cumbersome, and disassembly can easily cause secondary damage to the equipment under test. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned deficiencies in the existing technology and to provide a reasonably designed fault diagnosis and detection device for cryogenic liquid pumps, which can install a triaxial acceleration sensor without damaging the main body of the equipment, while ensuring the operating temperature of the triaxial acceleration sensor.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution: a cryogenic liquid pump fault diagnosis and detection device, comprising a triaxial acceleration sensor and a control chip module, wherein the triaxial acceleration sensor is connected to the control chip module; characterized in that: it further comprises a clamp base, an outer ring seat, an isolation working box, a heat-insulated inner box, and a resistance heating rod; the outer ring seat is sleeved and fixed on the outside of the clamp base; the isolation working box is fixed on the outer ring seat, and the control chip module is installed inside the isolation working box; the heat-insulated inner box is fixedly installed inside the isolation working box, and the triaxial acceleration sensor is installed inside the heat-insulated inner box; the resistance heating rod is installed inside the heat-insulated inner box, and the resistance heating rod is connected to the control chip module.

[0007] This utility model also includes a shaft end temperature sensing cable, which is installed on the clamp base; the shaft end temperature sensing cable is connected to the control chip module.

[0008] The outer side of the clamp base of this utility model is provided with a temperature sensing mounting groove, and the shaft end temperature sensing cable is fixedly installed at the bottom of the temperature sensing mounting groove.

[0009] The inner wall of the outer ring seat of this utility model is fixedly connected with a compression soft rubber pad, which abuts against the temperature sensing cable at the shaft end.

[0010] The outer wall of the outer ring seat of this utility model is provided with a heat insulation slot, and a heat insulation plug is fixedly connected to the isolation work box. The heat insulation plug is inserted and fixed in the heat insulation slot.

[0011] The heat insulation slot of this utility model has a limiting groove, and the heat insulation plug is fixedly connected to a limiting protrusion, which is snapped and fixed in the limiting groove.

[0012] The heat-insulating inner box of this utility model is fixedly connected with a mounting protrusion, and a three-dimensional acceleration sensor is mounted on the mounting protrusion.

[0013] The outer end opening of the isolation work box described in this utility model is equipped with a heat insulation cover.

[0014] The inner side of the heat insulation cover plate of this utility model abuts against the outer side of the control chip module.

[0015] The heat insulation cover of this utility model is provided with multiple quick-connect sockets on the outside, and the quick-connect sockets are connected to the control chip module.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. The clamp base is fixed to the housing at the shaft end of the cryogenic liquid pump, allowing the triaxial acceleration sensor to be installed without drilling or tapping on the surface of the device under test.

[0018] 2. The outer ring seat not only secures the clamp base but also provides thermal insulation, reducing the impact of the cryogenic liquid pump's low temperature on the isolation chamber. Simultaneously, the inner insulated chamber isolates the triaxial accelerometer from external low temperatures, ensuring stable operating temperature and normal operation. This prevents the triaxial accelerometer from failing due to low temperatures, and the stable temperature effectively improves its accuracy.

[0019] 3. The resistance heating rod can heat the inner cavity of the heat-insulating inner box, maintain the temperature of the inner cavity of the heat-insulating inner box, and improve the stability of the working environment temperature of the triaxial accelerometer. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0021] Figure 2 This is a top sectional view of an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 Enlarged structural diagram at point A;

[0023] Figure 4 This is a schematic diagram of the front sectional view of an embodiment of the present utility model;

[0024] Figure 5 This is a circuit diagram showing the connection of electrical components in an embodiment of this utility model;

[0025] Figure 6 This is a warning level classification diagram according to an embodiment of the present utility model.

[0026] Reference numerals: 1. Clamp base; 2. Outer ring seat; 3. Shaft end temperature sensing cable; 4. Circuit bus; 5. Control chip module; 6. Temperature sensing mounting slot; 7. Pressing soft rubber pad; 8. Triaxial accelerometer; 9. Insulation slot; 10. Insulation plug; 11. Limiting groove; 12. Isolation working box; 13. Insulation inner box; 14. Mounting protrusion; 15. Insulation cover plate; 16. Quick-connect socket; 17. Connecting block; 18. Resistance heating rod. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] Please see Figure 1 - Figure 6The present invention includes a clamp base 1, an outer ring seat 2, a shaft end temperature sensing cable 3, a control chip module 5, a compression soft rubber pad 7, a three-dimensional acceleration sensor 8, an isolation work box 12, and a heat-insulating inner box 13.

[0029] The clamp base 1 includes two mirror-symmetrical semi-circular ring structures, forming a clamp structure for attaching and fixing the clamp base 1 to the housing of the cryogenic liquid pump shaft end. The clamp base 1 has thermal conductivity. Temperature-sensing mounting grooves 6 are provided on both outer sides of the clamp base 1. A shaft-end temperature-sensing cable 3 is fixedly installed at the bottom of the temperature-sensing mounting groove 6, thus mounting the shaft-end temperature-sensing cable 3 onto the clamp base 1. In this embodiment, preferably, a semi-circular annular groove matching the outer diameter of the shaft-end temperature-sensing cable 3 is provided at the bottom of the temperature-sensing mounting groove 6, and the shaft-end temperature-sensing cable 3 is installed in the semi-circular annular groove. The semi-circular annular groove increases the contact area between the shaft-end temperature-sensing cable 3 and the temperature-sensing mounting groove 6, thereby improving the sensitivity of the shaft-end temperature-sensing cable 3 to temperature changes in the temperature-sensing mounting groove 6, and further improving the sensitivity to monitoring the operating temperature of the cryogenic liquid pump shaft end. A wire-passing notch is provided on the outer side of the mating position on one side of the clamp base 1, through which the signal transmission line of the shaft-end temperature-sensing cable 3 passes.

[0030] The outer ring seat 2 is sleeved and fixed to the outside of the clamp base 1. In this embodiment, preferably, an annular protrusion is fixedly connected to the middle of the inner wall of the outer ring seat 2, and a mating groove is opened on the middle of the outer wall of the clamp base 1 corresponding to the annular protrusion. The annular protrusion is engaged and fixed with the mating groove. In this embodiment, preferably, the mating point of the clamp base 1 and the outer ring seat 2 is fixed by multiple mating blocks 17. The mating blocks 17 are U-shaped pieces with fixed plugs fixedly connected to both ends of the inner wall. Through the provided mating blocks 17, the mating blocks 17 can be nailed into the clamp base 1 or the outer ring seat 2 on both sides of the mating point, thereby fixing the clamp base 1 and the outer ring seat 2. The structure is compact and the fixing effect is good. The annular protrusion and the mating groove prevent axial movement of the clamp base 1 and the outer ring seat 2, ensuring the stability of the connection between the clamp base 1 and the outer ring seat 2. Furthermore, the setting of the annular protrusion provides sufficient space for the opening of the heat insulation slot 9, increasing the depth of the heat insulation slot 9 and improving the stability of the mating point between the heat insulation plug 10 and the heat insulation slot 9. The outer ring seat 2 is made of rubber. A compression soft rubber pad 7 is fixedly connected to the inner wall of the outer ring seat 2 at the position corresponding to the outer side of the temperature sensing mounting groove 6. The inner wall of the compression soft rubber pad 7 abuts against the outer side of the shaft end temperature sensing cable 3. Through the setting of the compression soft rubber pad 7, the compression soft rubber pad 7 can press the shaft end temperature sensing cable 3 and the bottom semi-circular groove of the temperature sensing mounting groove 6 tightly through elastic deformation, ensuring that the shaft end temperature sensing cable 3 and the temperature sensing mounting groove 6 are tightly fitted.

[0031] The isolation work box 12 is fixed to the center of the outer wall of the outer ring seat 2. In this embodiment, preferably, the outer wall of the outer ring seat 2 is provided with a heat insulation slot 9, and the inner walls on both sides of the heat insulation slot 9 are provided with limiting grooves 11. A heat insulation plug 10 is fixedly connected to the center of the side of the isolation work box 12 facing the outer ring seat 2. Limiting protrusions are fixedly connected to both sides of the heat insulation plug 10 at the corresponding positions of the limiting grooves 11. The heat insulation plug 10 is inserted and fixed in the heat insulation slot 9, and the limiting protrusions are snapped and fixed in the limiting grooves 11. Through the limiting grooves 11, after the heat insulation plug 10 is inserted into the heat insulation slot 9, it is snapped and fixed by the limiting grooves 11 on both sides, thereby ensuring the firmness of the heat insulation plug 10. The annular arrangement of the heat insulation slot 9 makes it easy to adjust the installation position of the isolation work box 12, and the radial vibration of the cryogenic liquid pump shaft at different angles can be monitored by periodically changing the monitoring position.

[0032] The heat-insulating inner box 13 is fixedly installed at the bottom of the inner cavity of the isolation work box 12, and the heat-insulating inner box 13 is provided with rock wool for heat insulation. In this embodiment, preferably, a mounting protrusion 14 is fixedly connected to the center of the inner wall of each side of the heat-insulating inner box 13. The center of the mounting protrusion 14 near the outer ring seat 2 is provided with a threaded hole that matches the M5 fastener of the triaxial acceleration sensor 8. The triaxial acceleration sensor 8 is installed on the mounting protrusion 14, so that the triaxial acceleration sensor 8 is installed in the center of the heat-insulating inner box 13. Before installing the triaxial accelerometer 8, confirm that the triaxial accelerometer 8 and its accessory M5 fasteners are intact. Prepare a screwdriver and use a pry bar to pry open the battery component of the triaxial accelerometer 8 and remove the M6 ​​magnetic screw. Then, place the main body of the triaxial accelerometer 8 in the center of the insulated inner box 13, with the LED light facing upwards and the center aligned with the M5 screw hole on the mounting protrusion 14. Pass the M5 fastener through the center of the main body of the triaxial accelerometer 8 and tighten it with a screwdriver. Check the sensor on-site for looseness or wobbling, and test the quality of the verification data. Finally, depending on the on-site application, anti-theft steel wire rope can be used to tie the sensor to prevent it from falling off and being lost. The control chip module 5 is installed inside the isolated working box 12. The signal transmission line of the triaxial accelerometer 8 passes through the upper end of the insulated inner box 13 and connects to the control chip module 5. The signal output lines of the triaxial accelerometer 8 and the shaft end temperature sensing cable 3 are both electrically connected to the control chip module 5. The control chip module 5 is connected to the loop bus 4.

[0033] The outer end opening of the isolation work box 12, away from the outer ring seat 2, is fitted with a heat insulation cover 15, with the inner side of the heat insulation cover 15 abutting against the outer side of the control chip module 5. Multiple quick-connect sockets 16 are provided on the outer side of the heat insulation cover 15, which connect to the loop bus 4, allowing connection to an external industrial control computer. The heat insulation cover 15 provides insulation for the control chip module 5 and also facilitates wiring via the quick-connect sockets 16.

[0034] In this embodiment, preferably, resistance heating rods 18 are inserted and fixed at the four corners of the inner cavity of the heat-insulating inner box 13, and the resistance heating rods 18 are electrically connected to the power supply port of the control chip module 5. The resistance heating rods 18 are small-diameter single-head heating rods with temperature sensing elements. Through the resistance heating rods 18, the resistance heating rods 18 can heat the inner cavity of the heat-insulating inner box 13, maintain the temperature of the inner cavity of the heat-insulating inner box 13, and improve the stability of the working environment temperature of the triaxial accelerometer 8.

[0035] In this embodiment, preferably, the triaxial accelerometer 8 employs a dual-mass spring system structure for horizontal and vertical acceleration measurement, and a resonant sensor structure for axial acceleration measurement. This design allows the sensor to more accurately capture the vibration information of the cryogenic liquid pump in different directions during detection. The dual-mass spring system effectively isolates external interference, improving the accuracy of horizontal and vertical acceleration measurements. The resonant sensor structure utilizes its inherent resonant frequency to amplify the axial vibration signal, thereby achieving high-sensitivity detection of minute axial vibrations. Through this design, even minute abnormal vibrations generated by the cryogenic liquid pump during operation can be detected promptly, providing more reliable data support for fault diagnosis.

[0036] The working principle and usage process of this utility model are as follows: When using this device, the clamp base 1 is fixed on the housing of the shaft end of the cryogenic liquid pump. The clamp base 1 and outer ring seat 2 are designed to facilitate the laying of the shaft-end temperature sensing cable 3 by means of the temperature sensing mounting grooves 6 on both sides of the outer wall of the clamp base 1. The temperature sensing mounting grooves 6 with high thermal conductivity serve as the contact medium between the shaft-end temperature sensing cable 3 and the equipment housing, resulting in better contact temperature sensing effect and more sensitive response of the shaft-end temperature sensing cable 3. The two shaft-end temperature sensing cables 3 set on both sides can avoid the failure of the monitoring function caused by the failure of one shaft-end temperature sensing cable 3, ensuring the reliability of fault diagnosis of cryogenic liquid pump. The outer ring seat 2 can fix the clamp base 1 and also has a heat insulation effect, reducing the impact of the low temperature of the cryogenic liquid pump on the isolation working box 12. At the same time, the insulation inner box 13 isolates the external low temperature, ensuring the stability of the working temperature of the triaxial accelerometer 8, ensuring the normal operation of the triaxial accelerometer 8, avoiding the failure of the triaxial accelerometer 8 caused by low temperature, and the stable temperature can effectively improve the accuracy of the triaxial accelerometer 8.

[0037] The triaxial accelerometer 8 measures acceleration signals generated by the vibration of mechanical equipment. It simultaneously collects vibration signals from three directions using three accelerometers, which are then processed by the control chip module 5, converting the acceleration signals into electrical signals for output. This allows for real-time measurement of multiple parameters of the cryogenic liquid pump, including vibration velocity, vibration displacement, equipment surface temperature, and vibration frequency. By monitoring the vibration status and temperature of this equipment in real time, it helps to promptly detect equipment faults, ensuring normal operation and safe production. The vibration velocity collected by the vibration sensors within the triaxial accelerometer 8 is classified into four warning levels according to ISO 10816. The vibration velocity measurement results are analyzed by a cloud server, which automatically determines the operating status of the cryogenic liquid pump based on the magnitude and trend of the vibration velocity. When the vibration velocity exceeds the normal range, the system classifies the vibration status into four warning levels—slight, moderate, severe, and dangerous—according to ISO 10816, and issues an alarm to the operator through corresponding indicator lights or displays. This graded warning mechanism helps to promptly detect potential equipment problems, avoiding equipment damage or production accidents caused by abnormal vibration, thereby improving the operational safety and reliability of the cryogenic liquid pump.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-temperature liquid pump fault diagnosis detection device, comprising a three-dimensional acceleration sensor and a control chip module, the three-dimensional acceleration sensor being connected with the control chip module; characterized in that: The application also comprises a hoop base, an outer ring base, an isolated working box, a heat-insulated inner box and a resistance heating rod; the outer ring base is fixedly sleeved on the outer side of the hoop base; the isolated working box is fixed on the outer ring base, and the control chip module is installed in the isolated working box; the heat-insulated inner box is fixedly installed in the isolated working box, and the three-way acceleration sensor is installed in the heat-insulated inner box; the resistance heating rod is installed in the heat-insulated inner box, and the resistance heating rod is connected with the control chip module.

2. The cryogenic liquid pump failure diagnostic detection apparatus of claim 1, wherein: The application also comprises a shaft end temperature sensing cable, which is installed on the hoop base and connected with the control chip module.

3. The cryogenic liquid pump failure diagnostic detection apparatus of claim 2, wherein: The outer side of the hoop base is provided with a temperature sensing installation groove, and the shaft end temperature sensing cable is fixedly installed on the groove bottom.

4. The cryogenic liquid pump failure diagnostic detection apparatus of claim 1, wherein: The inner wall of the outer ring base is fixedly connected with a compressed soft rubber pad, which is in abutment with the shaft end temperature sensing cable.

5. The cryogenic liquid pump failure diagnostic detection apparatus of claim 1, wherein: The outer wall of the outer ring base is provided with a heat-insulating insertion groove, and the isolated working box is fixedly connected with a heat-insulating insertion block, which is fixedly inserted in the heat-insulating insertion groove.

6. The cryogenic liquid pump failure diagnostic detection apparatus of claim 5, wherein: The heat-insulating insertion groove is provided with a limiting recess, and the heat-insulating insertion block is fixedly connected with a limiting protrusion, which is fixedly clamped in the limiting recess.

7. The cryogenic liquid pump failure diagnostic detection apparatus of claim 1, wherein: The heat-insulated inner box is fixedly connected with an installation protrusion, and the three-way acceleration sensor is installed on the installation protrusion.

8. The cryogenic liquid pump failure diagnostic detection apparatus of claim 1, wherein: The outer end of the isolated working box is open, and a heat-insulated cover plate is installed at the opening.

9. The cryogenic liquid pump failure diagnostic detection apparatus of claim 8, wherein: The inner side of the heat-insulated cover plate is in abutment with the outer side of the control chip module.

10. The cryogenic liquid pump failure diagnostic detection apparatus of claim 8, wherein: The outer side of the heat-insulated cover plate is provided with a plurality of line quick-connection sockets, which are connected with the control chip module.

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