Vibration monitoring device of pumped storage unit

Abstract

The utility model discloses a vibration monitoring device of a pumped storage group, which belongs to the field of motor state monitoring and comprises a plurality of motors for the pumped storage group, and magnetoelectric vibration sensors adhered by adhesives are arranged above the motors. Compared with the prior art, the device has the advantages that the silicon carbide ceramic cover is arranged between the motor and the bottom surface of the shell of the magnetoelectric vibration sensor, and the silicon carbide ceramic cover is made of silicon carbide materials and has excellent functions of heat insulation, corrosion resistance and insulation, so that the cleanliness of the magnetoelectric vibration sensor can be ensured after the magnetoelectric vibration sensor is detached, and the service life of the magnetoelectric vibration sensor is prolonged. The silicon carbide has better corrosion resistance, so that when the adhesive layer of the silicon carbide ceramic cover is cleaned by using an adhesive remover, the body is not corroded, and the service life of the silicon carbide ceramic cover is ensured.

Description

Technical Field

[0001] This utility model relates to the field of motor condition monitoring, specifically to a vibration monitoring device for pumped storage units. Background Technology

[0002] When the motor of a pumped storage unit is running, the continuous rotation and load of the motor will cause a certain amount of vibration during operation. This vibration is normal for the motor. However, when the main shaft of the motor is not straight or the guide shaft clearance is mismatched, abnormal motor vibration will occur. Therefore, a vibration monitoring device for pumped storage units is needed to monitor each motor and transmission structure in real time.

[0003] Because pumped storage units use a large number of transmission structures and motors, magnetoelectric vibration sensors are installed on the motors and transmission structures for ease of management. Vibration monitoring components then analyze and summarize the vibration data from multiple magnetoelectric vibration sensors. When an abnormality is detected in the data signal transmitted from a local magnetoelectric vibration sensor, the early warning system of the vibration monitoring components is triggered, prompting maintenance personnel to monitor and repair the affected area.

[0004] To ensure the stability of the connection between the magnetoelectric vibration sensor and the motor without damaging the motor, adhesive is usually used to bond the two together. However, after disconnecting the connection, a layer of glue will remain on the bottom surface of the magnetoelectric vibration sensor. This glue layer can easily affect the next use of the magnetoelectric vibration sensor. To remove the glue layer, it is necessary to scrape it off with a scraper or dissolve it with a glue remover. However, using a scraper directly can easily damage the housing of the magnetoelectric vibration sensor, while using a glue remover can easily damage the housing of the magnetoelectric vibration sensor due to the corrosive nature of the remover. Utility Model Content

[0005] The technical problem this invention aims to solve is that the magnetoelectric vibration sensor in the existing pumped storage unit's vibration monitoring device lacks a protective layer on its bottom surface. This makes it difficult to clean the adhesive layer from the sensor's housing without damaging it after the sensor's housing has been unattached to the motor.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a vibration monitoring device for a pumped storage unit, including several motors for the pumped storage unit, a magnetoelectric vibration sensor bonded to the top of the motor by an adhesive, and a vibration monitoring component for monitoring changes in the electrical signal of the magnetoelectric vibration sensor on one side of the magnetoelectric vibration sensor, a silicon carbide ceramic cover fitted on the outer wall of the magnetoelectric vibration sensor between the bottom surface of the magnetoelectric vibration sensor and the outer wall of the motor, and a fixing stud passing through the bottom surface of the magnetoelectric vibration sensor is provided inside the silicon carbide ceramic cover.

[0007] As an improvement, the magnetoelectric vibration sensor includes a housing, a permanent magnet connected to the inner wall of the housing via an I-shaped aluminum frame, a spindle passing through the central axis of the permanent magnet, a coil and a damper located on the top and bottom surfaces of the spindle, and a spring plate connecting the beginning and end of the spindle and the housing, with the wire connecting the coil passing through the spring plate.

[0008] As an improvement, the housing is a single stainless steel structure, and an I-shaped aluminum frame passes through the inner wall of the housing.

[0009] As an improvement, the mandrel has an I-shaped structure, and the mandrel, damper, and spring plate are all connected by welding, with the outer ring sidewall of the spring plate welded to the inner wall of the housing.

[0010] As an improvement, a fixing block for fixing the silicon carbide ceramic cover is welded onto the outer wall of the motor.

[0011] As an improvement, the adhesive used to bond the silicon carbide ceramic cover and the fixing block is AB glue.

[0012] The advantages of this invention compared to the prior art are as follows: This device installs a silicon carbide ceramic cover between the bottom surface of the motor and the magnetoelectric vibration sensor housing. The silicon carbide material used in the silicon carbide ceramic cover has excellent heat insulation, corrosion resistance and insulation functions, which can ensure its own cleanliness after disassembling the magnetoelectric vibration sensor. Moreover, due to the good corrosion resistance of silicon carbide, the silicon carbide ceramic cover will not be corroded when the adhesive layer is cleaned with adhesive remover, thus ensuring the service life of the silicon carbide ceramic cover. Attached Figure Description

[0013] Figure 1 This is a general structural diagram of a vibration monitoring device for a pumped storage unit according to this utility model.

[0014] Figure 2 This is a structural diagram of a magnetoelectric vibration sensor for a vibration monitoring device of a pumped storage unit according to this utility model.

[0015] Figure 3 This is a cross-sectional view of a magnetoelectric vibration sensor of a vibration monitoring device for a pumped storage unit according to this utility model.

[0016] Figure 4 This is a structural diagram of the silicon carbide ceramic cover of a vibration monitoring device for a pumped storage unit according to this utility model.

[0017] As shown in the figure: 1. Motor; 11. Fixing block; 2. Magnetoelectric vibration sensor; 21. Housing; 22. I-shaped aluminum frame; 23. Permanent magnet; 24. Mandrel; 25. Coil; 26. Damper; 27. Spring plate; 3. Vibration monitoring component; 4. Silicon carbide ceramic cover; 41. Fixing stud. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] As per the instruction manual Figure 1 , 2 As shown in Figure 4, the system includes several motors 1 used in pumped storage units. A magnetoelectric vibration sensor 2 is attached to the top of each motor 1 using an adhesive. A fixing block 11 for fixing a silicon carbide ceramic cover 4 is welded to the outer wall of each motor 1. The adhesive used to bond the silicon carbide ceramic cover 4 and the fixing block 11 is AB glue. A vibration monitoring component 3 for monitoring changes in the electrical signal of the magnetoelectric vibration sensor 2 is located on one side of the magnetoelectric vibration sensor 2. A silicon carbide ceramic cover 4 is fitted onto the outer wall of the magnetoelectric vibration sensor 2 between the bottom surface of the magnetoelectric vibration sensor 2 and the outer wall of the motor 1. A fixing stud 41 passing through the bottom surface of the magnetoelectric vibration sensor 2 is located inside the silicon carbide ceramic cover 4. Each magnetoelectric vibration sensor 2 is connected to the receiver of the vibration monitoring component 3 using a data cable. Simultaneously, the fixing stud 41 inside the silicon carbide ceramic cover 4 is screwed into the screw hole on the bottom surface of the magnetoelectric vibration sensor 2 for connection. Next, use AB glue to bond the magnetoelectric vibration sensor 2 to the fixing block 11 on the outer wall of the motor 1. During bonding, in order to ensure the stability of the two, it is necessary to use a towel or sandpaper to clean the oil layer and dust on the fixing block 11. Using AB glue to bond the two can ensure that the magnetoelectric vibration sensor 2 receives a better signal. Moreover, since the silicon carbide ceramic cover 4 has excellent heat insulation, corrosion resistance and insulation functions, it can ensure that the motor 1 will not damage the magnetoelectric vibration sensor 2 when leakage occurs. The excellent heat insulation effect can also prevent the heat generated by the motor 1 during operation from affecting the resistance of the magnetoelectric vibration sensor 2.

[0020] As per the instruction manual Figure 2 , 3As shown, the magnetoelectric vibration sensor 2 includes a housing 21, a permanent magnet 23 connected to the inner wall of the housing 21 via an I-shaped aluminum frame 22, a spindle 24 passing through the central axis of the permanent magnet 23, a coil 25 and a damper 26 located on the top and bottom surfaces of the spindle 24, and a spring plate 27 connecting the beginning and end of the spindle 24 and the housing 21, with the wires connecting the coil 25 passing through the spring plate 27; the housing 21 is an integral stainless steel structure, and the I-shaped aluminum frame 22 passes through the inner wall of the housing 21; the spindle 24 is an I-shaped structure, and the spindle 24, the damper 26, and the spring plate 27 are all connected via... The outer ring sidewall of the spring plate 27 is welded to the inner wall of the housing 21. While fixing the permanent magnet 23 with the I-shaped aluminum frame 22, two grooves are separated to place the damper 26 and the coil 25. Then, the center position of the damper 26 and the spring plate 27 is welded together with a welding machine. Then, the other side of the spring plate 27 is welded to the inner wall of the housing 21. At the same time, the output wire of the coil 25 is passed through the through hole of the spring plate 27 and clamped on the top output port of the housing 21. Finally, the various structures of the housing 21 are welded together to make it an integrated structure and ensure its sealing.

[0021] In specific implementation of this utility model, after the silicon carbide ceramic cover 4 is glued to the fixing block 11 with AB glue, the screw hole on the bottom surface of the housing 21 is screwed into the fixing stud 41. Then, the vibration monitoring component 3 is activated to start the magnetoelectric vibration sensor 2 to monitor the vibration frequency of the motor 1 shaft and transmission structure used in the pumped storage unit. When the motor 1 malfunctions, the vibration frequency will change, and the electrical signal of the magnetoelectric vibration sensor 2 will change accordingly. When the vibration monitoring component 3 receives the changed signal, it will issue an early warning message to remind maintenance personnel to go for inspection. When the motor 1 is replaced, the magnetoelectric vibration sensor 2 can be unscrewed and screwed into the new silicon carbide ceramic cover 4 to complete the replacement. After the old silicon carbide ceramic cover 4 is separated with a scraper, the adhesive layer on the bottom surface of the silicon carbide ceramic cover 4 is dissolved and separated with an adhesive remover. After drying, it can be put back into the standby state.

[0022] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A vibration monitoring device for a pumped-storage unit, comprising a plurality of motors (1) for the pumped-storage unit, wherein a magnetoelectric vibration sensor (2) is attached above each motor (1) by an adhesive, and a vibration monitoring component (3) for monitoring changes in the electrical signal of the magnetoelectric vibration sensor (2) is provided on one side of the magnetoelectric vibration sensor (2), characterized in that: The bottom surface of the magneto-vibration sensor (2) is provided with a silicon carbide ceramic cover (4) sleeved on the outer wall of the magneto-vibration sensor (2), and the inside of the silicon carbide ceramic cover (4) is provided with a fixing stud (41) penetrating the bottom surface of the magneto-vibration sensor (2).

2. The vibration monitoring device for pumped storage units according to claim 1, characterized in that: The magneto-vibration sensor (2) comprises a shell (21), a permanent magnet (23) connected with the inner wall of the shell (21) through an I-shaped aluminum bracket (22), a core shaft (24) penetrating the central axis of the permanent magnet (23), a coil (25) and a damper (26) located at the top surface and the bottom surface of the core shaft (24), and a spring sheet (27) connecting the head and tail ends of the core shaft (24) and the shell (21), and the wires connected with the coil (25) penetrate the spring sheet (27).

3. The vibration monitoring device of pumped storage unit according to claim 2, characterized in that: The shell (21) is a whole structure of stainless steel, and the I-shaped aluminum bracket (22) penetrates the inner wall of the shell (21).

4. The vibration monitoring device for pumped storage units according to claim 2, characterized in that: The core shaft (24) is an I-shaped structure, and the core shaft (24), the damper (26) and the spring sheet (27) are all connected by welding, and the outer ring side wall of the spring sheet (27) is welded on the inner wall of the shell (21).

5. The vibration monitoring device for pumped storage units according to claim 1, characterized in that: The outer wall of the motor (1) is welded with a fixing block (11) for fixing the silicon carbide ceramic cover (4).

6. The vibration monitoring device of a pumped storage unit according to claim 5, characterized in that: The adhesive for bonding the silicon carbide ceramic cover (4) and the fixing block (11) is AB glue.

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