External temperature difference water circulation condensing oil tank adjustable pressure relief filter device

Abstract

The present invention discloses an external temperature difference water circulation condensing oil tank adjustable pressure relief filter device, wherein a cooling cylinder with a fixed plate has multiple layers of arc-shaped cooling fins and a supporting ring with four pillars, and the cooling cylinder is connected to the oil tank through an inlet, a connecting pipe and a pressure relief pipe. An annular cooling water pipe is arranged outside the outer guide cylinder, an oil absorption layer is arranged inside, and a U-shaped oil discharge pipe is arranged under the inner bottom plate. The two ends of the annular cooling water pipe are connected to the water inlet pipe and the water outlet pipe through a connecting hose; the middle guide pipe with the oil absorption layer is fixed under the pressure relief port of the upper cover, and a pressure relief discharge hole and a center hole cylinder of the oil mist filter are installed inside the middle guide pipe. The cooling cylinder has a cooling ring cavity, a lower cavity, an oil absorption layer ring cavity, an upper ring cavity, a middle ring lower cavity and a filter ring cavity, and an adjustment cover plate is arranged on the pressure relief port of the upper cover, and the upper cover is fixed to the upper end of the cooling cylinder. The present invention will be widely used in the field of hydro-turbine generator sets and other fields requiring pressure relief due to liquid expansion.

Description

Technical field:

[0001] The invention relates to a pressure relief device for lubricating and cooling oil grooves of a water turbine generator set bearing. Background technology:

[0002] The turbine oil tank of the hydraulic generator bearing lubrication produces expanded oil mist and oil smoke when the hydraulic generator is running. The pressure generated by the expansion causes the oil mist to overflow from the oil dynamic and static seals, polluting the generator stator and rotor coils, seriously damaging the working life of the generator. At present, the existing technical solutions to solve the problem of oil mist overflow due to expansion pressure are basically to use a simple respirator and an oil mist purifier with a fan on the oil tank cover. Both of these technical solutions have technical defects: the respirators are installed on the oil tank cover and connected to the inside of the oil tank. The circulating cooling air of the generator stator and rotor forms a large vacuum ring on the oil tank cover and in the space on the large shaft surface. The respirator uses a filter element to filter the oil mist for pressure relief. When the filter element has a large filtering mesh number, although the oil mist filtering effect is good during the pressure relief process, its filtering resistance is also large, so it is difficult to relieve the internal pressure of the oil tank, causing a large amount of oil mist to overflow from the dynamic and static seals of the oil tank under the action of the expansion pressure inside the oil tank; if the filter element mesh number is reduced, the filtering resistance is reduced and the pressure relief effect is improved, but the vacuum annulus formed by the circulating cooling air will suck out a large amount of expanded oil mist in the oil tank through the respirator, which will more seriously pollute the stator and rotor coils of the generator. For this reason, the power station maintenance personnel remove these respirators. The oil mist purifier powered by a fan can not only relieve pressure, but also generate negative pressure in the oil tank, sucking out all the oil mist inside the oil tank for purification, increasing the burden on the filter of the oil mist purifier, causing the filter of the oil mist purifier to fail due to blockage; the negative pressure generated by the oil mist purifier before failure destroys the inhibitory effect of the micro-pressure in the oil tank on the expansion of the turbine oil, causing the expansion of the turbine oil to intensify, causing the oil level of the turbine oil to drop quickly, resulting in an increase in the temperature of the bearing sleeve. Emergency shutdown accidents due to the decrease in oil level and the increase in temperature often occur. For this reason, power station maintenance personnel need to frequently add turbine oil to the oil tank, which increases the operating cost. A certain pressure is required in the oil tank to suppress the oil mist generated by expansion, but the pressure required to suppress the expansion of the oil mist in the oil tank cannot be higher than the sealing pressure at the dynamic and static seals of the oil tank to prevent the oil mist from overflowing from the dynamic and static seals. The pressure generated by the expansion minus the sealing pressure difference at the dynamic and static seals of the oil tank is the pressure that causes the oil mist to overflow, which is the pressure that must be relieved. The speed of the generator set is constant, the operating temperature is basically constant, and the expansion pressure generated is also constant; the sealing pressure at the dynamic and static seals is also basically constant, so the pressure to be relieved is also basically constant. When relieving the pressure, a large amount of oil mist must be purified to avoid overflow from the pressure relief port.The prior art does not fully consider the structural characteristics, working conditions and technical requirements of the turbine oil tank for lubricating each bearing of the hydro-turbine generator set to solve the technical problem of oil tank pressure relief. Therefore, the field of hydro-turbine generators urgently needs a pressure relief filter device that can not only reasonably relieve the excess pressure in the oil tank that causes the oil mist to overflow, but also retain a certain micro-pressure in the oil tank to suppress the expansion of the turbine oil, the pressure relief port of the pressure relief device is not affected by the vacuum ring formed by the circulating cooling wind, and cannot generate negative pressure in the oil tank, and the pressure relief value is adjustable, so as to eliminate the current phenomenon that the oil tank of each bearing sleeve of the hydro-turbine generator set generates expansion pressure inside the oil tank, causing the oil mist to overflow from the dynamic and static seals of the oil tank. Summary of the invention:

[0003] The present invention aims to provide a device that can meet the pressure relief conditions of various oil tanks of a hydro-turbine generator set, and its main technical features are: a fixing flange is fixed on the upper end of the cooling cylinder, and multiple layers of offset arc-shaped cooling fins are fixed in parallel on the inner wall of the cooling cylinder. The offset structure of the upper petal arc-shaped cooling fins and the lower petal arc-shaped cooling fins constitute a cooling maze. A pair of fixing plates with fixing holes are fixed at the middle position of the outer side of the cooling cylinder, a bottom plate with an inlet is fixed at the lower end of the cooling cylinder, a connecting pipe with a fixing flange is fixed below the inlet, a pressure relief pipe is connected below the connecting pipe, and the pressure relief pipe is connected to the oil tank, and a support ring is fixed on the bottom plate through 4 pillars, each The distance between the inner diameter of the arc-shaped cooling fin and the outer surface of the annular cooling water pipe fixed on the outer guide tube is 5 to 20 mm. The lower end of the annular cooling water pipe is connected to the water inlet pipe through a connecting hose. The water inlet pipe extends out of the cooling tube through a sealed through hole. The water inlet pipe is filled with low-temperature water. The upper end of the annular cooling water pipe is connected to the water outlet pipe through a connecting hose. The water outlet pipe extends out of the cooling tube through a sealed through hole. High-temperature water is discharged from the cooling tube through the water outlet pipe. The annular cooling water pipe is made of metal material with excellent thermal conductivity. An oil absorption layer is fixed on the inner wall of the outer guide tube. The surface of the oil absorption layer on the inner wall of the outer guide tube is connected to the surface of the oil absorption layer fixed on the middle guide tube. The surface of the oil absorption layer on the outer wall forms a 30-50 mm oil absorption layer annular cavity, the inner bottom plate of the outer guide tube and the bottom plate form a lower cavity, a U-shaped oil discharge pipe is fixed in the oil discharge hole on the inner bottom plate, the upper end of the outer guide tube and the cooling tube, the upper cover and the middle guide tube form an upper annular cavity, the outer guide tube with a U-shaped oil discharge pipe on the inner bottom plate, an annular cooling water pipe fixed on the outside and an oil absorption layer fixed on the inner wall is fixed on the supporting ring, the middle guide tube with an oil absorption layer fixed on the outer wall is fixed at the center position under the upper cover with a pressure relief port in the center, the middle guide tube is concentrically connected with the pressure relief port, and a fixing method with a screw hole is fixed on the upper end of the center hole tube with a pressure relief discharge hole The center hole tube is fixed with a center bottom plate at the lower end, and the oil mist filter is fixed on the outer surface of the center hole tube. The center hole tube is fixed to the inside of the center guide tube by bolts through the fixed flange with flange holes at the upper end of the center guide tube and the fixed flange with screw holes at the upper end of the center hole tube. The adjustment cover is connected to the upper cover above the pressure relief port by adjusting bolts through the screw holes on the upper cover. The adjustment cover is used to adjust the pressure relief flow area of ​​the pressure relief port. The upper cover is fixed to the cooling tube by bolts through the flange holes on the upper cover and the fixed flange at the upper end of the cooling tube. The lower end of the center guide tube, the outer guide tube, the inner bottom plate, the center hole tube and the center bottom plate form the middle ring lower cavity. The oil absorption layer has good oil mist absorption performance, the oil mist filter has a large filtering area and small filtering resistance. This device is placed outside the pit. The ambient temperature outside the pit is generally 5℃~20℃. During the operation of the generator, the oil tank temperature is 60℃~70℃, and the temperature inside the pit is also 50℃~60℃.The device is connected to the oil tank by a pressure relief pipe. The distance between the layers of the multi-layer and multi-petal arc-shaped cooling fins is 50 to 80 mm. The inner diameter of the arc-shaped cooling fins is the same. The upper and lower layers are installed in a staggered manner to form a maze structure, so that the high-temperature oil mist overflowed due to pressure relief can fully exchange heat in the maze composed of the cooling cylinder and arc-shaped cooling fins of the device, so that the temperature of the high-temperature oil mist is reduced to the condensation point and converted into liquid turbine oil; when the temperature difference between the temperature in the oil tank and the ambient temperature outside the pit is too small, the technical solution not only uses the arc-shaped cooling fins to cool the high-temperature oil mist, but also adds low-temperature cooling water to the annular cooling water pipe to increase the temperature difference between the ambient cooling temperature and the oil mist temperature, so as to make the oil mist condense into liquid with better effect. The cover plate can adjust the flow area of ​​the pressure relief port to adjust the required pressure relief value in the oil tank. A certain micro-pressure should be maintained inside the oil mist to play a certain role in inhibiting the generation of expanded oil mist.

[0004] The technical effect achieved by the technical solution provided by the present invention is achieved in the following way: the device is installed at a position slightly higher than the oil tank on the outer wall of the machine pit, and the device is connected to the inside of the high-temperature oil tank through an inlet, a connecting pipe and a pressure relief pipe, thereby playing a role in relieving the pressure of the oil tank. During the process of relieving the pressure of the oil tank, a large amount of high-temperature oil mist and a very small amount of oil smoke will also enter the device along the pressure relief pipe, so a multi-channel structure capable of capturing and filtering oil mist is designed in the device. The oil mist of 60℃~70℃ enters the lower cavity of the device through the pressure relief pipe and the connecting pipe, and the oil mist will heat exchange along the labyrinth composed of multiple layers of arc-shaped cooling fins and the cooling ring cavity composed of annular cooling water pipes (made of stainless steel or metal materials with good thermal conductivity) to transform the high-temperature oil mist into low-temperature liquid turbine oil. The temperature of the cooling cylinder and the arc-shaped cooling fins during the heat exchange process is 5℃~20℃, and the water temperature of the water inlet pipe of the annular cooling water pipe is generally 5℃~10℃, so that the high-temperature oil mist reaches the condensation point after the heat exchange and is transformed into liquid turbine oil. The ambient temperature outside the pit is generally between 5℃ and 20℃, and the temperature difference with the oil tank is about 55℃, so the high-temperature oil mist condensation effect is very good. Since the difference between the expansion pressure and the atmospheric pressure in the oil tank is basically constant, and the resistance of each capture and filter oil mist is basically constant, it cannot be used to adjust the required pressure relief value. Therefore, the oil mist in the maze area composed of arc-shaped cooling fins and the cooling ring cavity composed of it and the annular cooling water pipe and other annular cavities in this device has a uniform flow rate and is very slow. The heat exchange efficiency is very high. About 80% of the high-temperature oil mist will be converted into liquid turbine oil and flow back to the oil tank. When the temperature difference between the ambient temperature outside the pit and the temperature in the oil tank is large enough to meet the oil mist condensation requirements, low-temperature cooling water can be added to the annular cooling water pipe. When the temperature difference between the two is small, cooling water can be added to the annular cooling water pipe to condense the oil mist. The remaining oil mist after the oil mist is cooled and captured in the cooling ring cavity enters the oil absorption layer through the upper ring cavity and is absorbed by the oil absorption layers on both sides. The oil mist condenses into liquid turbine oil in the oil absorption layer and flows back to the tank. With the pressure pushing, a very small amount of oil mist is pushed into the filter ring cavity through the lower cavity of the middle ring. The oil mist is captured and purified through the oil mist filter body. The pressure to be discharged from the oil tank is discharged from the device through the pressure relief discharge hole, the central cavity and the pressure relief port. A large amount of oil mist discharged with the pressure relief is condensed, captured and adsorbed by multiple oil mists and retained in the device. The condensed and captured oil mist is converted into liquid turbine oil and flows back to the bottom plate of the device under the action of gravity, and flows back to the oil tank through the U-shaped oil discharge pipe, the inlet, the connecting pipe and the pressure relief pipe; the liquid turbine oil converted from oil mist in the oil absorption layer on the middle guide pipe and the oil mist filter body also flows back to the inner bottom plate under the action of gravity, flows to the bottom plate through the oil discharge hole and the U-shaped oil discharge pipe, and is discharged back to the oil tank through the inlet, the connecting pipe and the pressure relief pipe. The function of the U-shaped oil drain pipe is to discharge the captured liquid turbine oil to the bottom of the device through the U-shaped oil drain pipe and return it to the oil tank. The high-temperature oil mist cannot enter the lower cavity of the middle ring through the U-shaped oil drain pipe. Before using this device, inject a certain amount of turbine oil into the U-shaped oil drain pipe.Since the resistance of various structures for capturing and filtering oil mist in this device is very small and cannot be adjusted, the adjustment of the oil tank pressure relief value is achieved by adjusting the cover plate to change the pressure relief flow area of ​​the pressure relief port. The adjustment cover plate can be rotated left and right to adjust the pressure relief flow area of ​​the pressure relief port. When the pressure relief port is adjusted to a certain area, the expansion pressure generated in the oil tank will not cause the oil mist to overflow from the dynamic and static seals of the oil tank. This device can not only remove the excess expansion pressure in the oil tank that can cause the oil mist to overflow, but also maintain a certain micro-pressure in the oil tank to inhibit the expansion and generation of oil mist. Since this device is placed on the outer wall of the pit, it is not affected by the vacuum ring formed by the circulating cooling wind of the generator. During the pressure relief process, it has a good multi-channel capture and filtration function for a large amount of oil mist discharged to the outside, so that the discharged oil mist is converted into liquid turbine oil and returned to the oil tank, which perfectly solves the technical problems existing in the field of hydro-turbine generator sets.

[0005] The present invention is cleverly designed and simple in structure. The technical solution not only reasonably and organically combines the heat conduction temperature difference generated by the arc-shaped cooling fin with the condensation technical solution of the annular cooling water pipe, but also applies technical solutions such as oil mist capture by the oil absorption layer annular cavity and the filter annular cavity. The technical solution of adjusting the pressure relief value in the oil tank by adjusting the flow area of ​​the pressure relief port by adjusting the cover plate is reliable, simple and practical. Therefore, compared with the prior art, the technical solution disclosed by the present invention is novel, creative and practical, and will be widely used in the field of hydro-turbine generator sets and other related fields. Description of the drawings:

[0006] Figure 1 . Front view of external temperature difference water circulation condensing oil tank adjustable pressure relief filter device

[0007] Figure 2 .Top view of external temperature difference water circulation condensing oil tank adjustable pressure relief filter device

[0008] Figure 3 .Right view of external temperature difference water circulation condensing oil tank adjustable pressure relief filter device

[0009] Figure 4 .External temperature difference water circulation condensing oil tank adjustable pressure relief filter device AA view

[0010] Figure 5 . External temperature difference water circulation condensing oil tank adjustable pressure relief filter device cooling cylinder internal view

[0011] Figure 6 . External temperature difference water circulation condensing oil tank adjustable pressure relief filter device cooling cylinder internal three-dimensional view

[0012] in:

[0013] 1. Upper cover 2. Bolt 3. Adjusting bolt

[0014] 4. Adjust the cover plate 5. Pressure relief port 6. Middle guide pipe

[0015] 7. Oil absorption layer 8. Fixed flange 9. Oil mist filter

[0016] 10. Pressure relief hole 11. Flange hole 12. Screw hole

[0017] 13. Center hole tube 14. External guide tube 15. Fixed plate

[0018] 16. Oil absorption layer annular cavity 17. Fixing hole 18. Arc cooling fin

[0019] 19. Annular cooling water pipe 20. Center bottom plate 21. Support ring

[0020] 22, support 23, lower cavity 24, bottom plate

[0021] 25. Pressure relief pipe 26. Inlet 27. Connecting pipe

[0022] 28. U-shaped oil drain pipe 29. Oil drain hole 30. Inner bottom plate

[0023] 31. Connecting hose 32. Sealing hole 33. Water inlet pipe

[0024] 34, middle ring lower cavity 35, filter ring cavity 36, cooling ring cavity

[0025] 37. Cooling cylinder 38. Central cavity 39. Water outlet pipe

[0026] 40. Upper ring cavity Specific implementation method:

[0027] The support ring 21 is fixed on the center of the bottom plate 24 with the inlet 26 through four pillars 22. A connecting pipe 27 with a fixed flange 8 is connected below the inlet 26. The connecting pipe 27 is connected to the pressure relief pipe 25 connected to the oil tank through the flange hole 11 on the fixed flange 8 by bolts 2. The bottom plate 24 is fixed to the lower end of the cooling tube 37 with multiple layers, parallel, and offset arc-shaped cooling fins 18 fixed inside. A pair of fixing plates 15 with fixing holes 17 are fixed at the middle position outside the cooling tube 37. A fixing flange 8 with flange holes 11 is fixed at the upper end of the cooling tube 37. The inner bottom plate 30 with a U-shaped oil drain pipe 28 below is fixed to the lower end of the outer guide tube 14. The U-shaped oil drain pipe 28 is connected to the oil drain hole 29. The oil absorption layer 7 is fixed on the inner surface of the outer guide tube 14. The outer guide tube 14 is fixed to the support ring 21 through the inner bottom plate 30. The lower surface of the inner bottom plate 30 and the upper surface of the bottom plate 24 form a lower cavity 23. The annular cooling water pipe 19 is put on the outer guide tube 14 and fixed. The lower end of the annular cooling water pipe 19 is connected with the water inlet pipe 33 through the connecting hose 31. The water inlet pipe 33 extends out of the cooling tube 37 through the sealing hole 32. The upper end of the annular cooling water pipe 19 is connected with the water outlet pipe 39 through the connecting hose 31. The water outlet pipe 39 extends out of the cooling tube 37 through the sealing hole 32. The outer surface of the oil absorption layer 7 on the inner wall of the outer guide tube 14 and the surface of the oil absorption layer 7 fixed on the outer wall of the middle guide tube 6 form the oil absorption layer annular cavity 16, and the outer surface of the annular cooling water pipe 19 and the inner diameter of the multi-layer arc cooling fins 18 form the cooling annular cavity 36. The upper end of the outer guide tube 14, the lower surface of the upper cover 1, the cooling tube 37 and the middle guide tube 6 form the upper annular cavity 40. A fixing flange 8 with a flange hole 11 is fixed to the upper end of the middle flow guide tube 6, and then the middle flow guide tube 6 with an oil absorption layer 7 fixed on the outer surface is fixed below the pressure relief port 5 on the upper cover 1, and the oil mist filter 9 is fixed on the outer wall of the center hole tube 13 with a center bottom plate 20 and a pressure relief row hole 10 on the circumference. The fixing flange 8 with a screw hole 12 is fixed to the upper end of the center hole tube 13. The center hole tube 13 is fixed to the middle flow guide tube 6 by bolts 2 through the fixing flange 8 inside the middle flow guide tube 6 and the fixing flange 8 with screw holes 12 on the center hole tube 13. The center hole tube 13 forms a pressure relief center cavity 38 without oil mist. The adjustment cover plate 4 is connected to the pressure relief port 15 of the upper cover 1 by adjusting bolts 3. The adjustment cover plate 4 can adjust the pressure relief flow area of ​​the pressure relief port 5 by parallel movement on the pressure relief port 5. The upper cover 1 is fixed to the cooling tube 37 by bolts 2 through the flange hole 11 on the upper cover 1 and the fixing flange 8 at the upper end of the cooling tube 37. The outer surface of the oil mist filter 9 and the inner surface of the middle guide pipe 6 are at a certain distance to form a filter ring cavity 35, and the lower end of the middle guide pipe 6, the upper surface of the inner bottom plate 30, the central bottom plate 20 and the surface of the oil mist filter 9 form a middle ring lower cavity 34.

Claims

1. An external temperature difference water circulation condensation type oil tank adjustable pressure relief filter device, characterized in that: A fixing flange is fixed on the upper end of the cooling cylinder, and multiple layers of offset arc-shaped cooling fins are fixed in parallel on the inner wall of the cooling cylinder. The offset structure of the upper petal arc-shaped cooling fins and the lower petal arc-shaped cooling fins constitutes a cooling maze. A pair of fixing plates with fixing holes are fixed in the middle position of the outer side of the cooling cylinder, and a bottom plate with an inlet is fixed at the lower end of the cooling cylinder. A connecting pipe with a fixing flange is fixed under the inlet. A pressure relief pipe is connected under the connecting pipe, and the pressure relief pipe is connected to the oil tank. The supporting ring is fixed on the bottom plate through 4 pillars. The inner diameter of each layer of arc-shaped cooling fins and the outer surface of the annular cooling water pipe fixed on the outer guide cylinder constitute The cooling ring cavity distance is 5 to 20 mm. The lower end of the annular cooling water pipe is connected to the water inlet pipe through a connecting hose. The water inlet pipe extends out of the cooling tube through a sealed through hole. The water inlet pipe is filled with low-temperature water. The upper end of the annular cooling water pipe is connected to the water outlet pipe through a connecting hose. The water outlet pipe extends out of the cooling tube through a sealed through hole. High-temperature water is discharged from the cooling tube through the water outlet pipe. The annular cooling water pipe is made of metal material with excellent thermal conductivity; an oil absorption layer is fixed on the inner wall of the outer guide tube. The surface of the oil absorption layer on the inner wall of the outer guide tube and the surface of the oil absorption layer fixed on the outer wall of the middle guide tube form a 30 to 50 mm gap. The inner bottom plate of the outer guide tube and the bottom plate form a lower cavity, a U-shaped oil drain pipe is fixed in the oil drain hole on the inner bottom plate, the upper end of the outer guide tube, the cooling tube, the upper cover and the middle guide tube form an upper annular cavity, the outer guide tube with a U-shaped oil drain pipe on the inner bottom plate, an annular cooling water pipe fixed on the outside and an oil-absorbing layer fixed on the inner wall is fixed on the supporting ring, the middle guide tube with an oil-absorbing layer fixed on the outer wall is fixed to the center position under the upper cover with a pressure relief port in the center, the middle guide tube is connected with the pressure relief port concentrically, a fixing flange with a screw hole is fixed on the upper end of the center hole tube with the pressure relief drain hole, and the lower end of the center hole tube is fixed A central bottom plate is fixed, and the oil mist filter is fixed on the outer surface of the central hole tube. The central hole tube is fixed to the inside of the central guide tube by bolts through a fixed flange with a flange hole at the upper end of the central guide tube and a fixed flange with a screw hole at the upper end of the central hole tube. The adjusting cover plate is connected to the upper cover above the pressure relief port by adjusting bolts through the screw holes on the upper cover. The adjusting cover plate is used to adjust the pressure relief flow area of ​​the pressure relief port. The upper cover is fixed to the cooling tube by bolts through the flange hole on the upper cover and the fixing flange at the upper end of the cooling tube. The lower end of the central guide tube, the outer guide tube, the inner bottom plate, the central hole tube and the central bottom plate form a central ring lower cavity.

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