Waterproof measuring device suitable for water turbine main shaft sealing abrasion loss

Abstract

The invention relates to the field of water turbine abrasion loss measurement, and discloses a waterproof measuring device suitable for water turbine main shaft sealing abrasion loss. The magnetic sensor comprises an electronic detection main body and a waveguide tube, an external slot is formed in the outer surface of the electronic detection main body, a plug is movably connected to the inner surface of the external slot, a control main body is fixedly connected to the outer surface of the end, away from the external slot, of the plug, and an external main body is arranged on the outer surface of the control main body; the outer surface of the waveguide tube is movably connected with an isolation lantern ring, the outer surface of the isolation lantern ring is movably connected with a floating magnetic ring, the first part is fixed at the relative static position of the whole unit, the magnetic sensor is fixed by the equipment bracket, and the second part is sleeved at the waveguide tube by the floating magnetic ring supported by the lower support bracket and the reinforcer. During the period, the external main body controls time through the control main body to supply power to the magnetostrictive sensor to generate a current pulse, the current pulse interacts with a magnetic field from a floating magnetic ring outside the sensor to generate a strain pulse, and the strain pulse is detected by the waveguide tube.

Description

Technical Field

[0001] The invention belongs to the technical field of turbine wear measurement, and in particular relates to a waterproof measuring device suitable for the wear of a main shaft seal of a turbine. Background Art

[0002] The main shaft seals for the left and right bank units of a hydropower plant are provided by Zhejiang Fu. When the unit is running, the anti-wear ring and the sealing block are rubbed inside the main shaft seal, and water is used for lubrication in the middle. When the anti-wear ring reaches the design requirement of wear, the leakage of main shaft sealing water increases, and there is a risk of flooding the water guide bearing.

[0003] The liquid level inside the turbine top cover is mainly measured by manual observation through the scale of the guide pin. The equipment is installed under the support cover, which is not very convenient for manual observation and cannot be monitored in real time.

[0004] Since it was put into operation, due to the influence of water quality, during the flood season of the basin, the amount of water and sediment inside the main shaft seal is relatively large, which accelerates the wear of the sealing block.

[0005] In December 2022, the thickness of the main shaft seal block of Unit 8 was reduced, the water inflow into the top cover increased, and the top cover drainage pump failed to drain water in time. The unit was shut down for emergency processing. To deal with this problem, the water in the turbine flow channel needed to be drained. The staff entered the top cover to disassemble the main shaft seal and replace the main shaft seal block. The processing was difficult and the construction period was tight, which affected the stability of the unit's power generation operation.

[0006] In order to accurately understand the wear condition of the main shaft seal block and enhance the predictability of the work, a waterproof sensor suitable for measuring the wear of the main shaft seal of the turbine is proposed here. Summary of the invention

[0007] The purpose of the present invention is to provide a waterproof measuring device for the wear of the main shaft seal of a turbine in order to solve the above-mentioned problem of accurately understanding the wear of the main shaft seal block and enhancing the predictability of the work.

[0008] The technical solution adopted by the present invention is as follows: a waterproof measuring device suitable for the wear amount of the main shaft seal of a turbine, including a magnetostrictive sensor, the magnetostrictive sensor including an electronic detection body and a waveguide tube, the outer surface of the electronic detection body is provided with an external slot, the inner surface of the external slot is movably connected with a plug, the outer surface of the plug away from the external slot is fixedly connected with a control body, the outer surface of the control body is provided with an external body, the outer surface of the waveguide tube is movably connected with an isolation ring, and the outer surface of the isolation ring is movably connected with a floating magnetic ring.

[0009] By adopting the above technical solution, the first part is fixed in the relatively static position of the whole unit, and the magnetostrictive sensor is fixed by the equipment bracket. The second part is supported by the lower support bracket and the reinforcement member to support the floating magnetic ring, which is sleeved on the waveguide. During this period, the external main body controls the time to power the magnetostrictive sensor through the control main body to generate a current pulse that interacts with the magnetic field from the floating magnetic ring outside the sensor, generating a strain pulse, which is detected by the waveguide. By using the electronic detection main body to accurately measure the time between the application of the interrogation pulse and the arrival of the generated strain pulse, the position of the magnet can be determined with high precision and high speed; the isolation ring prevents the waveguide and the floating magnetic ring from contacting and forming a whole, causing the destruction of the magnetic field and failing to achieve the detection effect.

[0010] In a preferred embodiment, a waterproof cover is movably mounted on the outer surface of the magnetostrictive sensor corresponding to the electronic detection body, the lower surface of the waterproof cover is movably connected to a waterproof shell, the inner surface of the waterproof shell is movably connected to a hexagonal screw, and the outer surface of the hexagonal screw passes through the waterproof shell and is fixedly connected to the waterproof cover.

[0011] By adopting the above technical solution, the waterproof cover and the waterproof shell respectively protect the electronic detection body to prevent the internal electronic components from being damaged by external forces due to large vibration of the unit and long operation time. The waterproof cover and the waterproof shell are made of stainless steel with high hardness and good stability. At the same time, they provide shielding effect on the outside to ensure the quality of detection. The two are fixed by rotating the hexagonal screws and fixing them to the threaded groove of the corresponding waterproof cover.

[0012] In a preferred embodiment, a sealing rubber ring is movably connected to the inner surface of the waterproof cover plate corresponding to the waterproof shell, and an auxiliary sealing ring is movably sleeved on the outer surface of the fixed sleeve corresponding to the plug.

[0013] By adopting the above technical solution, the sealing rubber ring completes the sealing between the waterproof cover and the waterproof shell, and the auxiliary sealing ring is used to seal between the external slot and the plug to ensure the overall sealing effect, enhance the sealing of the equipment, prevent water seepage in the equipment, and increase the operating stability of the equipment.

[0014] In a preferred embodiment, a lower waterproof shell is welded to the lower surface of the waterproof shell, a fixing sleeve is welded to the lower surface of the lower waterproof shell, and a sealing tube is fixedly connected to the inner surface of the fixing sleeve.

[0015] By adopting the above technical scheme, the lower waterproof shell, the fixed sleeve, the sealing tube and the waterproof shell form a whole, which protects the waveguide tube from external forces at the bottom. The fixed sleeve ensures that the waveguide tube is installed on the same axis. The sealing tube provides a guarantee for the sealing of the magnetostrictive sensor, prevents water seepage in the equipment, and increases the operating stability of the equipment.

[0016] In a preferred embodiment, an upper support bracket is disposed on the outer surface of the floating magnetic ring, and a lower support bracket is movably connected to the outer surface of one end of the upper support bracket away from the floating magnetic ring.

[0017] By adopting the above technical solution, the lower support bracket is fixed in a relatively static position integrally formed with the sealing block, and the upper support bracket is conveniently rotated to complete the fixation, which is convenient for installation adjustment.

[0018] In a preferred embodiment, a reinforcement piece is welded to the outer surface of the upper support bracket, and a protective layer is provided on the outer surface of the upper support bracket corresponding to the floating magnetic ring.

[0019] By adopting the above technical solution, the reinforcement ensures the support of the upper support bracket, avoiding large vibration of the unit after the upper support bracket is fixed for a long time, resulting in unstable support. The protective layer is used to support the floating magnetic ring, and at the same time avoids the upper support bracket from being magnetized due to long-term contact, resulting in reduced detection accuracy.

[0020] In a preferred embodiment, a device bracket is movably connected to the outer surface of the fixing sleeve, and a fixing hole is provided on the outer surface of one end of the device bracket away from the fixing sleeve.

[0021] By adopting the above technical solution, the equipment bracket can conveniently support the entire magnetostrictive sensor, and the fixing holes can facilitate the support of the lower supporting bracket and the equipment bracket in the unit.

[0022] In a preferred embodiment, a fixing screw is movably connected to the inner surface of the fixing hole, and bolts are provided on the corresponding outer surfaces between the reinforcement member and the lower supporting bracket.

[0023] By adopting the above technical solution, bolts are convenient for connecting the lower support bracket and reinforcement, and fixing screws are convenient for fixing the entire equipment in the corresponding position.

[0024] In a preferred embodiment, the outer surface of the upper support bracket is painted with anti-corrosion and waterproof spray paint, the outer surface of the lower support bracket is painted with anti-corrosion and waterproof spray paint, and the outer surface of the equipment bracket is painted with anti-corrosion and waterproof spray paint.

[0025] By adopting the above technical solution, in an environment with high humidity and high vibration inside the unit, anti-corrosion and waterproof spray paint can slow down water corrosion and increase equipment durability.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. The current pulse generated by the external power supply to the magnetostrictive sensor interacts with the magnetic field from the floating magnetic ring along the outside of the sensor to generate a strain pulse, which is detected by the waveguide. By accurately measuring the elapsed time between the application of the interrogation pulse and the arrival of the generated strain pulse with the electronic detection body, the position of the magnet can be determined with high precision and high speed. The overall principle of the device is simple, easy to use, and effective;

[0028] 2. The waterproof cover and waterproof shell are made of stainless steel with high hardness and good stability. They can protect the magnetic sensor unit from large vibrations. After a long period of operation, it is easy to be damaged by external forces. The equipment sealing rubber ring, auxiliary sealing ring and fixed sleeve have an overall sealing effect in an environment with high humidity.

[0029] 3. The overall support of the equipment takes up little space, and the upper support bracket and the lower support bracket are fixed in a disassembled manner, which ensures the flexible fixing position of the equipment in the unit and avoids problems such as the equipment being unable to be fixed due to too small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a front view of the overall appearance of the device of the present invention;

[0031] Figure 2 It is a side view of the overall appearance of the device in the present invention;

[0032] Figure 3 This is a disassembled diagram of the main structure of the device in the present invention;

[0033] Figure 4 It is an exploded diagram of the installation of the equipment detection structure in the present invention;

[0034] Figure 5 This is an installation and disassembly diagram of the equipment detection structure in the present invention;

[0035] Figure 6 For the present invention Figure 4 Enlarged view of point A in the middle.

[0036] Markings in the figure: 1. Magneto-induced sensor; 2. Electronic detection body; 3. Waveguide; 4. Isolation ring; 5. Floating magnetic ring; 6. External slot; 7. Plug; 8. Control body; 9. External body; 10. Waterproof cover; 11. Waterproof shell; 12. Hexagonal screw; 13. Sealing rubber ring; 14. Auxiliary sealing ring; 15. Lower waterproof shell; 16. Fixed sleeve; 17. Sealing tube; 18. Fixed hole; 19. Upper support bracket; 20. Lower support bracket; 21. Reinforcement; 22. Protective layer; 23. Bolt; 24. Fixing screw; 25. Equipment bracket. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0038] Example:

[0039] Reference Figure 1-5 A waterproof measuring device suitable for the wear amount of the main shaft seal of a turbine comprises a magnetostrictive sensor 1, the magnetostrictive sensor 1 comprises an electronic detection body 2 and a waveguide tube 3, an external slot 6 is arranged on the outer surface of the electronic detection body 2, a plug 7 is movably connected to the inner surface of the external slot 6, a control body 8 is fixedly connected to the outer surface of the plug 7 away from the external slot 6, an external body 9 is arranged on the outer surface of the control body 8, an isolation ring 4 is movably connected to the outer surface of the waveguide tube 3, and a floating magnetic ring 5 is movably connected to the outer surface of the isolation ring 4.

[0040] The first part is fixed in the relatively static position of the whole unit, and the magnetostrictive sensor 1 is fixed by the equipment bracket 25. The second part is supported by the lower support bracket 20 and the reinforcement 21 to support the floating magnetic ring 5 to be sleeved on the waveguide 3. During this period, the external body 9 controls the time through the control body 8 to power the magnetostrictive sensor 1 to generate a current pulse that interacts with the magnetic field from the floating magnetic ring 5 along the outside of the sensor, generating a strain pulse, which is detected by the waveguide 3. By using the electronic detection body 2 to accurately measure the time between the application of the interrogation pulse and the arrival of the generated strain pulse, the position of the magnet can be determined with high precision and high speed; the isolation ring 4 prevents the waveguide 3 and the floating magnetic ring 5 from contacting and forming a whole, causing the destruction of the magnetic field and failing to achieve the detection effect.

[0041] Reference Figure 1-5 The outer surface of the magnetostrictive sensor 1 corresponds to the electronic detection body 2 and is movably connected with a waterproof cover 10. The lower surface of the waterproof cover 10 is movably connected with a waterproof shell 11. The inner surface of the waterproof shell 11 is movably connected with a hexagonal screw 12. The outer surface of the hexagonal screw 12 penetrates the waterproof shell 11 and is fixedly connected to the waterproof cover 10.

[0042] The waterproof cover 10 and the waterproof shell 11 respectively protect the electronic detection body 2 to prevent the internal electronic components from being damaged by external forces due to large vibration of the unit and long operation time. The waterproof cover 10 and the waterproof shell 11 are made of stainless steel with high hardness and good stability. At the same time, they provide shielding effect on the outside to ensure the quality of detection. The hexagonal screw 12 is rotated and fixed to the threaded groove of the corresponding waterproof cover 10 to complete the fixation of the two.

[0043] Reference Figure 1-6 The inner surface of the waterproof cover plate 10 is movably connected to the waterproof housing 11 with a sealing rubber ring 13 , and the outer surface of the fixed sleeve 16 is movably sleeved with an auxiliary sealing ring 14 corresponding to the plug 7 .

[0044] The sealing rubber ring 13 completes the sealing between the waterproof cover 10 and the waterproof shell 11, and the auxiliary sealing ring 14 is used to seal between the external slot 6 and the plug 7 to ensure the overall sealing effect, enhance the sealing of the equipment, prevent water seepage in the equipment, and increase the operating stability of the equipment.

[0045] Reference Figure 1-5 A lower waterproof shell 15 is welded to the lower surface of the waterproof shell 11 , a fixed sleeve 16 is welded to the lower surface of the lower waterproof shell 15 , and a sealing tube 17 is fixedly connected to the inner surface of the fixed sleeve 16 .

[0046] The lower waterproof shell 15, the fixed sleeve 16, and the sealing tube 17 form a whole with the waterproof shell 11, which protect the waveguide 3 from external forces at the bottom. The fixed sleeve 16 ensures that the waveguide 3 is installed on the same axis. The sealing tube 17 provides a guarantee for the sealing of the magnetostrictive sensor 1 to prevent water seepage in the equipment and increase the operating stability of the equipment.

[0047] Reference Figure 1-3 An upper support bracket 19 is provided on the outer surface of the floating magnetic ring 5 , and a lower support bracket 20 is movably connected to the outer surface of one end of the upper support bracket 19 away from the floating magnetic ring 5 .

[0048] The lower support bracket 20 is fixed in a relatively static position integrally formed with the sealing block, and the upper support bracket 19 is conveniently rotated to complete the fixation, so as to facilitate the adjustment of the installation.

[0049] Reference Figure 1-3 A reinforcement member 21 is welded on the outer surface of the upper support bracket 19 , and a protective layer 22 is provided on the outer surface of the upper support bracket 19 corresponding to the floating magnetic ring 5 .

[0050] The reinforcement 21 ensures the support of the upper support bracket 19 to avoid large vibration of the unit after the upper support bracket 19 is fixed for a long time, resulting in unstable support. The protective layer 22 is used to support the floating magnetic ring 5, and at the same time avoids the upper support bracket 19 from being magnetized due to long-term contact, resulting in reduced detection accuracy.

[0051] Reference Figure 1-3 The outer surface of the fixing sleeve 16 is movably connected with a device bracket 25 , and the outer surface of one end of the device bracket 25 away from the fixing sleeve 16 is provided with a fixing hole 18 .

[0052] The equipment bracket 25 facilitates supporting the magnetostrictive sensor 1 as a whole, and the fixing hole 18 facilitates supporting the lower supporting bracket 20 and the equipment bracket 25 in the unit.

[0053] Reference Figure 1-3 A fixing screw 24 is movably connected to the inner surface of the fixing hole 18 , and a bolt 23 is provided on the corresponding outer surface between the reinforcement 21 and the lower support bracket 20 .

[0054] The bolts 23 facilitate connecting the lower support bracket 20 and the reinforcement member 21, and the fixing screws 24 facilitate fixing the entire device in a corresponding position.

[0055] Reference Figure 1-3 The outer surface of the upper support bracket 19 is painted with anti-corrosion and waterproof paint, the outer surface of the lower support bracket 20 is painted with anti-corrosion and waterproof paint, and the outer surface of the equipment bracket 25 is painted with anti-corrosion and waterproof paint.

[0056] In an environment with high humidity and large vibration inside the unit, anti-corrosion and waterproof spray paint can slow down water corrosion and increase equipment durability.

[0057] The implementation principle of the waterproof measuring device for the wear of the main shaft seal of a water turbine according to the present invention is as follows:

[0058] The device is divided into two parts. The first part is fixed in a relatively static position of the entire unit, and the magnetostrictive sensor 1 is fixed by the device bracket 25. The second part is supported by the lower support bracket 20 and the reinforcement 21, and the floating magnetic ring 5 is sleeved on the waveguide tube 3. During this period, the magnetostrictive sensor 1 is powered from the outside to generate a current pulse that interacts with the magnetic field from the floating magnetic ring 5 along the outside of the sensor, generating a strain pulse that is detected by the waveguide tube 3. By using the electronic detection body 2 to accurately measure the time between the application of the interrogation pulse and the arrival of the generated strain pulse, the position of the magnet can be determined with high precision and speed; during the operation of the main shaft seal, the anti-wear ring rotates with the main shaft of the unit, and the sealing block is a stationary device, so during the operation of the equipment, friction will be generated between the sealing block and the anti-wear ring. As time goes by, the sealing block will wear and the position of the equipment will drop. The main shaft seal wear measurement device measures the height of the sealing block and then determines the amount of wear of the sealing block. After the sealing block is worn, the lower support bracket 20 and the reinforcement 21 move downward, resulting in a change in position, so the measured value of the magnetostrictive sensor 1 changes. The waterproof cover 10 and the waterproof housing 11 respectively protect the electronic detection body 2 to prevent the internal electronic components from being easily damaged by external forces due to large vibration of the unit and long operation time. The water cover 10 and the waterproof shell 11 are made of stainless steel with high hardness and good stability. At the same time, they provide shielding effect on the outside to ensure the quality of detection. The hexagonal screw 12 is rotated and fixed to the threaded groove of the corresponding waterproof cover 10 to complete the fixation of the two. The sealing rubber ring 13 completes the seal between the waterproof cover 10 and the waterproof shell 11. The function of the auxiliary sealing ring 14 is to seal between the external slot 6 and the plug 7 to ensure the overall sealing effect, enhance the sealing of the equipment, prevent water seepage in the equipment, and increase the operating stability of the equipment. The lower waterproof shell 15, the fixed sleeve 16, and the sealing tube 17 form a whole with the waterproof shell 11 to protect the waveguide tube 3 from external force at the bottom. The fixed sleeve 16 ensures that the waveguide tube 3 is installed on the same axis. The sealing tube 17 provides a guarantee for the sealing of the magnetostrictive sensor 1 to prevent water seepage in the equipment and increase the operating stability of the equipment.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waterproof measuring device for measuring the wear of a main shaft seal of a water turbine, comprising a magnetostrictive sensor (1), characterized in that: The magnetostrictive sensor (1) comprises an electronic detection body (2) and a waveguide tube (3); an external slot (6) is arranged on the outer surface of the electronic detection body (2); a plug (7) is movably connected to the inner surface of the external slot (6); a control body (8) is fixedly connected to the outer surface of the plug (7) away from the external slot (6); an external body (9) is arranged on the outer surface of the control body (8); an isolation ring (4) is movably connected to the outer surface of the waveguide tube (3); and a floating magnetic ring (5) is movably connected to the outer surface of the isolation ring (4).

2. A waterproof measuring device for turbine main shaft seal wear as claimed in claim 1, characterized in that: The outer surface of the magnetostrictive sensor (1) is movably sleeved with a waterproof cover plate (10) corresponding to the electronic detection body (2); the lower surface of the waterproof cover plate (10) is movably connected to a waterproof housing (11); the inner surface of the waterproof housing (11) is movably connected to a hexagonal screw (12); the outer surface of the hexagonal screw (12) penetrates the waterproof housing (11) and is fixedly connected to the waterproof cover plate (10).

3. A waterproof measuring device for turbine main shaft seal wear as claimed in claim 2, characterized in that: The inner surface of the waterproof cover plate (10) is movably connected to the waterproof housing (11) with a sealing rubber ring (13), and the outer surface of the fixed sleeve (16) is movably sleeved to the plug (7) with an auxiliary sealing ring (14).

4. A waterproof measuring device for turbine main shaft seal wear as claimed in claim 2, characterized in that: A lower waterproof shell (15) is welded to the lower surface of the waterproof shell (11), a fixed sleeve (16) is welded to the lower surface of the lower waterproof shell (15), and a sealing tube (17) is fixedly connected to the inner surface of the fixed sleeve (16).

5. A waterproof measuring device for turbine main shaft seal wear as claimed in claim 1, characterized in that: An upper support bracket (19) is provided on the outer surface of the floating magnetic ring (5), and a lower support bracket (20) is movably connected to the outer surface of one end of the upper support bracket (19) away from the floating magnetic ring (5).

6. A waterproof measuring device for turbine main shaft seal wear as claimed in claim 5, characterized in that: A reinforcement piece (21) is welded on the outer surface of the upper support bracket (19), and a protective layer (22) is provided on the outer surface of the upper support bracket (19) corresponding to the floating magnetic ring (5).

7. A waterproof measuring device for turbine main shaft seal wear as claimed in claim 4, characterized in that: The outer surface of the fixing sleeve (16) is movably connected to a device bracket (25), and a fixing hole (18) is provided on the outer surface of one end of the device bracket (25) away from the fixing sleeve (16).

8. A waterproof measuring device for turbine main shaft seal wear as claimed in claim 7, characterized in that: A fixing screw (24) is movably connected to the inner surface of the fixing hole (18), and bolts (23) are provided on the corresponding outer surfaces between the reinforcement member (21) and the lower support bracket (20).

9. A waterproof measuring device for turbine main shaft seal wear as claimed in claim 7, characterized in that: The outer surface of the upper support bracket (19) is painted with anti-corrosion and waterproof spray paint, the outer surface of the lower support bracket (20) is painted with anti-corrosion and waterproof spray paint, and the outer surface of the equipment bracket (25) is painted with anti-corrosion and waterproof spray paint.

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