CN111173667A - Mixed flow type unit top cover water intaking pressure regulating device with filtering capability - Google Patents
Mixed flow type unit top cover water intaking pressure regulating device with filtering capability Download PDFInfo
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- CN111173667A CN111173667A CN202010138310.5A CN202010138310A CN111173667A CN 111173667 A CN111173667 A CN 111173667A CN 202010138310 A CN202010138310 A CN 202010138310A CN 111173667 A CN111173667 A CN 111173667A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/08—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator for removing foreign matter, e.g. mud
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/006—Sealing arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention discloses a mixed flow type unit top cover water taking pressure regulating device; belongs to the technical field of water turbines; the water inlet device is characterized by comprising a runner crown fixed at the lower end of a main shaft and a top cover arranged on the periphery of the runner crown, wherein the inner side wall of the top cover is matched with the outer side wall of the runner crown to form a water inlet gap communicated with a flow channel; a plurality of first filter rings are arranged on the upper end surface of the upper crown of the rotating wheel on the side edge of the main shaft at intervals along the circumferential direction, a guide ring is arranged on the inner top of the top cover, and the guide ring consists of a bottom ring fixed on the inner top of the top cover and second filter rings vertically arranged on the bottom ring and matched with the first filter rings; the first filtering ring and the second filtering ring are matched to form a filtering water channel with an S-shaped vertical loading surface; the invention aims to provide the mixed flow type unit top cover water taking and pressure regulating device with the filtering function, which has the advantages of unique structure, good sealing performance, energy conservation and environmental protection; the vertical mixed-flow water turbine is used for a high-water-head high-rotating-speed mixed-flow vertical water turbine.
Description
Technical Field
The invention relates to a water taking and pressure regulating device for a water turbine, in particular to a mixed flow type unit top cover water taking and pressure regulating device with a filtering function.
Background
The existing high-water-head high-rotating-speed mixed flow vertical water turbine adopts a technical water supply mode that external water is taken as a unit mostly for a cooling water system, the water quality needs to be clean, a certain acting force is required to enable cooling water to enter the system, and sometimes a filter needs to be additionally arranged. The main shaft seal generally adopts rubber hydraulic pressure piston type end face seal, sealing pressure water needs to be provided, and a rotary seal ring is easy to wear. The structure is troublesome to maintain, and needs to be replaced when the antiwear ring is damaged after the working seal is used for a period of time; another common structure of the main shaft seal is a packing press-fitting type, which has the disadvantages that the packing is easy to wear and the pressure change needs to be adjusted frequently. And when the guide vane moves, the pressure in the top cover balance cavity changes along with the guide vane, and the stability of the unit can be influenced.
In order to solve the problems, the applicant adopts a simple pump plate to match with a top cover water taking device to supply sealing water to a main shaft seal, and solves the problem that external water taking is needed. However, in the practical application process, the water quantity at the pump plate is large, and the water consumption of the water taking device is small, so that the water source circulation at the pump plate is poor, and the filtering effect is influenced. Meanwhile, the water guide bearing, the lower guide bearing, the air cooler, the upper guide thrust bearing and the like in the water turbine still need to be cooled by externally supplied cooling water, and the power generation cost is increased.
Disclosure of Invention
The invention aims to provide the mixed flow type unit top cover water taking and pressure regulating device with the filtering function, which is unique in structure, good in sealing performance, energy-saving and environment-friendly, and aims to overcome the defects of the prior art.
The technical scheme of the invention is realized as follows: the utility model provides a mixed flow formula unit top cap water intaking pressure regulating device with filtering capability, is including fixing the runner crown of fixing at the main shaft lower extreme and setting up at runner crown outlying top cap, the cooperation of top cap inside wall and runner crown lateral wall forms the clearance of intaking that switches on mutually with the runner.
A plurality of first filter rings are arranged on the upper end surface of the upper crown of the rotating wheel on the side edge of the main shaft at intervals along the circumferential direction, a guide ring is arranged on the inner top of the top cover, and the guide ring consists of a bottom ring fixed on the inner top of the top cover and second filter rings vertically arranged on the bottom ring and matched with the first filter rings; the first filtering ring and the second filtering ring are matched to form a filtering water channel with an S-shaped vertical loading surface; the top cover is provided with a water taking connector communicated with the filtering water channel, and the water taking connector is communicated with the cooling water pipe.
A main shaft sealing unit is arranged at the upper end of the top cover, and a main shaft bushing matched with the main shaft sealing unit is arranged on the main shaft; the second filter ring positioned at the inner end is matched with the outer wall of the upper crown of the rotating wheel and the outer wall of the lower end of the main shaft to form a water leakage gap, the leakage gap is communicated with the main shaft sealing unit, and water passing through the leakage gap enters the main shaft sealing unit to be used as main shaft sealing water.
In the mixed flow type unit top cover water taking and pressure regulating device with the filtering function, the inner side wall of the top cover corresponding to the annular water inlet gap is detachably connected with the inner thread ring; the thread pitch of the upper thread of the internal thread ring is 10-15mm, and the thread lead angle is 10-20 degrees; the internal thread ring is matched with the outer side wall of the upper crown of the rotating wheel to form an annular water inlet gap which is communicated with the flow channel and is provided with an internal thread wall; the distance between the narrowest parts of the annular water inlet gaps is 2-5mm, and the distance between the widest parts is 5-10mm larger than that between the narrowest parts.
In the mixed flow type unit top cover water taking and pressure regulating device with the filtering function, two first filtering rings are provided; the number of the second filtering rings is three, the two second filtering rings positioned on the outer side and the two first filtering rings are arranged in a staggered mode, the distance between the two second filtering rings positioned on the outer side and the adjacent first filtering ring is 2-5mm, and the distance between the second filtering ring positioned on the inner end and the adjacent first filtering ring is 80-100 mm.
The two second filtering rings positioned at the outer side and the two first filtering rings are matched to form an S-shaped rapid water channel, the second filtering ring positioned at the inner end is matched with the adjacent first filtering ring to form a pressure stabilizing water channel, and the rapid water channel and the pressure stabilizing water channel are matched to form a filtering water channel; and a water inlet of the water taking connector is communicated with the pressure stabilizing water channel.
In the mixed flow type unit top cover water taking and pressure regulating device with the filtering function, the width of the leakage gap is 2-5 mm.
In the mixed flow type unit top cover water taking and pressure regulating device with the filtering function, the cooling water pipe on the side edge of the water taking joint is in conduction connection with the first water drainage pipe, and the cooling water pipe and the first water drainage pipe are respectively provided with the automatic pressure regulating valve; the cooling water pipes are respectively connected with the cooling pipelines in the water guide bearing, the lower guide bearing, the air cooler and the upper guide thrust bearing in a conduction mode, and cooling water in the cooling water pipes enters the cooling pipelines to absorb heat and then flows back to the cooling water pipes and is discharged to tail water from a water outlet end.
In the mixed flow type unit top cover water taking and pressure regulating device with the filtering function, the main shaft sealing unit consists of an overhaul sealing seat arranged at the upper end of the top cover, an overhaul sealing ring arranged in the overhaul sealing seat and matched with the main shaft bushing, a sealing seat fixedly arranged on the overhaul sealing seat and positioned at the periphery of the main shaft bushing, a plurality of annular grooves axially arranged at intervals on the inner wall of the sealing seat, a second drain pipe in conduction connection with the annular groove at the uppermost end and V-shaped composite material sealing rings arranged in the rest of the annular grooves and matched and sealed with the main shaft bushing; the water outlet end of the second water discharge pipe is communicated with tail water; an antiwear ring which is contacted with the main shaft bushing is arranged on the inner wall of the sealing seat at the side edge of the annular groove.
In the mixed flow type unit top cover water taking and pressure regulating device with the filtering function, the overhaul sealing seat consists of a first sealing ring fixedly connected with the upper end of the top cover and a second sealing ring fixedly connected with the first sealing ring through a screw; a first annular sealing groove is formed in the upper end face of the end part, close to the spindle bushing, of the first sealing ring, a second annular sealing groove matched with the first annular sealing groove is formed in the second sealing ring, the first annular sealing groove and the second annular sealing groove are matched to form a third annular sealing groove, the opening of the third annular sealing groove faces the spindle bushing, the axial section of the third annular sealing groove is small outside and large inside, the overhaul sealing ring is arranged in the third annular sealing groove, the axial section of the overhaul sealing ring in the initial state is in a shape which is suitable for the third annular sealing groove, and the outer end of the overhaul sealing ring is not in contact with the spindle bushing; and a fourth annular sealing groove is arranged at the contact part of the first sealing ring and the second sealing ring at the side edge of the third annular sealing groove, and a sealing rubber ring is arranged in the fourth annular sealing groove.
An arc-shaped groove is formed in the end face, opposite to the bottom in the third annular sealing groove, of the maintenance sealing ring along the circumferential direction, a medium through hole opposite to the arc-shaped groove is formed in the side wall of the third annular sealing groove, the outer end of the medium through hole is connected with a first quick connector, and the first quick connector is connected with an external compressed water source or compressed air source pipeline; when the maintenance is needed, an external compressed water source or a compressed air source enters the third annular sealing groove through a pipeline, and the maintenance sealing ring is extruded to enable the outer end of the maintenance sealing ring to be in contact with the spindle bushing for sealing.
In the mixed flow type unit top cover water taking and pressure regulating device with the filtering function, the connecting ring is integrally formed at the lower end of the main shaft, the connecting ring is fixedly connected with the upper crown of the rotating wheel through the bolt, the protective cover is arranged on the connecting ring at the periphery of the bolt, the outer diameter of the protective cover is the same as the outer diameter of the connecting ring, the middle part of the protective cover is provided with a yielding through hole adaptive to the main shaft, and the inner diameter of the yielding through hole is 0.5-1.5mm larger than the outer diameter of the main shaft.
After the structure is adopted, the water inlet gap is formed between the upper crown of the rotating wheel and the top cover, and water is filtered through the reasonably designed filtering water channel, so that large-particle impurities are precipitated, the cleanness of water flow is effectively ensured, and the follow-up water supply is guaranteed. Simultaneously, through ingenious design seepage clearance for through filterable clean water source flow in main shaft seal unit through the seepage clearance and use as sealed water, need not additionally to design numerous and diverse structure and carry out the moisturizing to main shaft seal unit and seal, with compact ingenious structure, reach energy-concerving and environment-protective purpose, have apparent beneficial effect. Through reasonable gap design and the buffering effect of the S-shaped filtering water channel, the sealing water which enters the main shaft sealing unit from the leakage gap keeps a reasonable pressure range without pressure regulation.
Furthermore, the water taking joint is connected with the cooling water pipe, and the filtered water at the water taking joint is used for cooling the water guide bearing, the lower guide bearing, the air cooler and the upper guide thrust bearing, so that the water source at the pump plate is fully utilized.
Drawings
The invention will be further described in detail with reference to examples of embodiments shown in the drawings to which, however, the invention is not restricted.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged partial schematic view at A of FIG. 1;
FIG. 3 is an enlarged partial schematic view at B of FIG. 1;
fig. 4 is a partially enlarged schematic view at C in fig. 1.
In the figure: 1. a main shaft; 1a, a connecting ring; 2. crown mounting of the rotating wheel; 2a, a first filtering ring; 3. a top cover; 4. a water inlet gap; 4a, an internal thread ring; 5. a flow guide ring; 5a, a bottom ring; 5b, a second filtering ring; 6. filtering the water channel; 7. a water intake joint; 8. a cooling water pipe; 9. a main shaft sealing unit; 9a, overhauling the sealing seat; 9b, overhauling the sealing ring; 9c, a seal seat; 9d, an annular groove; 9e, a second drain pipe; 9f, V-shaped composite material sealing rings; 9g, a first sealing ring; 9h, a second sealing ring; 9i, a first annular seal groove; 9j, a second annular seal groove; 9k, arc-shaped grooves; 10. a main shaft bushing; 11. a leakage gap; 12. a fast water channel; 13. a pressure stabilizing water channel; 14. a first drain pipe; 14a, automatic pressure regulating valve; 15. a water guide bearing; 16. a lower guide bearing; 17. an air cooler; 18. an upper guide thrust bearing; 19. an antiwear ring; 20. a dielectric via; 21. a quick coupling; 22. a shield.
Detailed Description
Referring to fig. 1 to 4, the mixed flow type unit top cover water taking and pressure regulating device with the filtering function of the invention comprises a runner crown 2 fixed at the lower end of a main shaft 1 and a top cover 3 arranged at the periphery of the runner crown 2, wherein the inner side wall of the top cover 3 is matched with the outer side wall of the runner crown 2 to form a water inlet gap 4 communicated with a flow channel. Preferably, an internal thread ring 4a is detachably connected to the inner side wall of the top cover 3 corresponding to the annular water inlet gap 4; the thread pitch of the thread on the internal thread ring 4a is 10-15mm, and the thread lead angle is 10-20 degrees; the internal thread ring 4a is matched with the outer side wall of the runner crown 2 to form an annular water inlet gap 4 which is communicated with the runner and is provided with an internal thread wall; the distance between the narrowest parts of the annular water inlet gaps 4 is 2-5mm, and the distance between the widest parts is 5-10mm larger than that between the narrowest parts. Through the experiment discovery, set up the internal thread ring of reasonable parameter for the interval width of intaking is alternative, and water velocity is time and fast during slow, and forms similar vortex state in the wide department in the interval, and large granule debris are detained in vortex department, have unexpected filter effect.
In order to improve the filtering effect, a plurality of first filtering rings 2a are arranged on the upper end surface of the runner crown 2 on the side of the main shaft 1 at intervals along the circumferential direction, a flow guide ring 5 is arranged at the inner top of the top cover 3, and the flow guide ring 5 consists of a bottom ring 5a fixed on the inner top of the top cover 3 and a second filtering ring 5b vertically arranged on the bottom ring 5a and matched with each first filtering ring 2 a; the first filtering ring 2a and the second filtering ring 5b are matched to form a filtering water channel 6 with an S-shaped vertical loading surface; the top cover 3 is provided with a water taking connector 7 communicated with the filtering water channel 6, and the water taking connector 7 is communicated with the cooling water pipe 8.
In this embodiment, after repeated experiments, it is preferable that the number of the first filter rings 2a is two; the number of the second filtering rings 5b is three, the two second filtering rings 5b positioned at the outer side and the two first filtering rings 2a are arranged in a staggered manner, the distance between the two second filtering rings 5b positioned at the outer side and the adjacent first filtering rings 2a is 2-5mm, and the distance between the second filtering ring 5b positioned at the inner end and the adjacent first filtering rings 2a is 80-100 mm.
The two second filtering rings 5b positioned at the outer side and the two first filtering rings 2a are matched to form an S-shaped rapid water channel 12, the second filtering ring 5b positioned at the inner end is matched with the adjacent first filtering ring 2a to form a pressure stabilizing water channel 13, and the rapid water channel 12 is matched with the pressure stabilizing water channel 13 to form a filtering water channel 6; the water inlet of the water taking connector 7 is communicated with the pressure stabilizing water channel 13. The large particle impurities are precipitated by combining the change of the water flow speed with the S-shaped bend. The structure of replacing the filter screen with ingenious structure realizes the filter effect.
A main shaft sealing unit 9 is arranged at the upper end of the top cover 3, and a main shaft bushing 10 matched with the main shaft sealing unit 9 is arranged on the main shaft 1; the second filter ring 5b at the inner end is matched with the outer wall of the upper crown 2 of the rotating wheel and the outer wall of the lower end of the main shaft 1 to form a leakage gap 11, the leakage gap 11 is communicated with the main shaft sealing unit 9, and water passing through the leakage gap 11 enters the main shaft sealing unit to serve as main shaft sealing water. Preferably, the width of the leak gap 11 is 2-5 mm. In the range, the sealing water passing through the leakage gap can be kept under reasonable pressure by specifically adjusting the size of the upper crown of the runner and combining the action of the pressure stabilizing water channel.
Preferably, the lower end of the main shaft 1 is integrally formed with a connecting ring 1a, the connecting ring 1a is fixedly connected with the runner crown 2 through a bolt, a protective cover 22 is arranged on the connecting ring 1a at the periphery of the bolt, the outer diameter of the protective cover 22 is the same as that of the connecting ring 1a, a abdicating through hole matched with the main shaft 1 is arranged in the middle of the protective cover 22, and the inner diameter of the abdicating through hole is 0.5-1.5mm larger than that of the main shaft 1. The structure has the advantages that the abdication through hole can avoid the contact of the protective cover and the main shaft, the installation is convenient, and the cooling water can not enter the protective cover. In the practical use process, a small amount of water enters the gap, the gap can be basically regarded as not, and when the spindle sealing unit rotates, cooling water moves upwards along with the rotation and enters the spindle sealing unit.
Furthermore, a first water discharge pipe 14 is connected to the cooling water pipe 8 on the side of the water intake joint 7 in a conducting manner, and automatic pressure regulating valves 14a are respectively arranged on the cooling water pipe 8 and the first water discharge pipe 14; the cooling water pipe 8 is respectively connected with cooling pipelines in the water guide bearing 15, the lower guide bearing 16, the air cooler 17 and the upper guide thrust bearing 18 in a conduction mode, and cooling water in the cooling water pipe 8 enters each cooling pipeline to absorb heat, then flows back to the cooling water pipe and is discharged to tail water from a water outlet end.
Through the structure, the large-traffic drainage that connects with the water intaking is used for the cooling of each part of the hydraulic turbine, the water that will pass through the seepage clearance is used for the sealed of main shaft seal unit, make the water source of pump plate department obtain abundant and reasonable utilization, need not outside water intaking just can satisfy the effect requirement of unit cooling water and sealed water system, install automatic air-vent valve additional on the pipeline simultaneously, the pressure differential that the balance that can be automatic arouses by the activity stator, when the aperture is adjusted to the activity stator, water pressure is great if change, automatic air-vent valve can automatic balance regulation pressure, guarantee the normal taking of cooling water and sealing water. The purposes of energy conservation and environmental protection are achieved.
In this embodiment, the main shaft sealing unit 9 is composed of an overhaul sealing seat 9a arranged at the upper end of the top cover 3, an overhaul sealing ring 9b arranged in the overhaul sealing seat 9a and matched with the main shaft bushing 10, a sealing seat 9c fixedly arranged on the overhaul sealing seat 9a and positioned at the periphery of the main shaft bushing 10, a plurality of annular grooves 9d axially arranged at intervals on the inner wall of the sealing seat 9c, a second drain pipe 9e in conductive connection with the uppermost annular groove 9d, and V-shaped composite sealing rings 9f arranged in the rest of the annular grooves 9d and matched and sealed with the main shaft bushing 10; the water outlet end of the second water outlet pipe 9e is communicated with tail water; an antiwear ring 19 contacting with the spindle bush 10 is provided on the inner wall of the seal seat 9c on the side of the annular groove 9 d. The V-shaped composite material sealing ring can automatically adjust the compression amount along with the pressure, is not easy to wear, and effectively realizes the optimization of structure and performance.
Preferably, the overhaul sealing seat 9a consists of a first sealing ring 9g fixedly connected with the upper end of the top cover 3 and a second sealing ring 9h fixedly connected with the first sealing ring 9g through a screw; a first annular sealing groove 9i is formed in the upper end face of the first sealing ring 9g close to the upper end portion of the main shaft bushing 10, a second annular sealing groove 9j matched with the first annular sealing groove 9i is formed in the second sealing ring 9h, the first annular sealing groove 9i and the second annular sealing groove 9j are matched to form a third annular sealing groove, the opening of the third annular sealing groove faces the main shaft bushing 10, the axial section of the third annular sealing groove is small outside and large inside, the overhaul sealing ring 9b is arranged in the third annular sealing groove, the axial section of the overhaul sealing ring 9b in the initial state is in a shape which is small outside and large inside and the outer end of the overhaul sealing ring is not in contact with the main shaft bushing 10; a fourth annular sealing groove is formed in the contact part of the first sealing ring 9g and the second sealing ring 9h on the side edge of the third annular sealing groove, and a sealing rubber ring is arranged in the fourth annular sealing groove.
An arc-shaped groove 9k is formed in the end face, opposite to the bottom in the third annular sealing groove, of the overhaul sealing ring 9b along the circumferential direction, a medium through hole 20 opposite to the arc-shaped groove 9k is formed in the side wall of the third annular sealing groove, the outer end of the medium through hole 20 is connected with a quick connector 21, and the quick connector 21 is connected with an external compressed water source or compressed air source pipeline; when the maintenance is needed, an external compressed water source or a compressed air source enters the third annular sealing groove through a pipeline, and the maintenance sealing ring 9b is extruded to enable the outer end of the maintenance sealing ring to be in contact with the main shaft bushing 10 for sealing.
The sealing seat adopts three ring channel structure, and two ring channels of well, below adopt V type combined material sealing washer to seal, and the ring channel of the top is connected the second drain pipe. In the operation process of the unit, because the static part (top cap, overhaul seal receptacle and seal receptacle) of shaft seal and the rotating part (main shaft and main shaft bush) contactless, it is sealed to have constituteed the clearance, the water of clearance seal position can not all rely on water intake device to make its drainage clean, there is a small amount of water seepage to enter into the main shaft seal system, use as the main shaft seal water, V type sealing washer can be automatic adjustment compression capacity under water pressure this moment, can effectually prevent that excessive water from leaking through the main shaft seal, the second drain pipe of the ring channel of the top also can be with a little water leakage self-flowing row to the tailwater simultaneously.
By adopting the structure, the corrosion of silt to the turbine runner and the main shaft seal can be effectively prevented. The main shaft seal does not need to provide a cooling or lubricating clean water source in the operation process, and meanwhile, a V-shaped sealing ring of the main shaft seal is not easy to wear, and the main shaft seal is simple in structure and convenient to overhaul. The structure is suitable for the high-water-head high-rotating-speed mixed-flow vertical water turbine.
Examples of the experiments
To examine the advantage of the structure of the present invention over the prior art (grant publication No. CN207393375U) in terms of filtering effect. Before the structure of the prior art is improved, the filtering effect of the filter on impurities with various particle sizes is detected. The detection method comprises the steps of respectively sampling and detecting at the crown water channel of the rotating wheel and the water outlet of the water taking device, namely respectively sampling and detecting before and after filtering. After the data of the prior art are obtained, the structure of the prior art is improved, firstly, the original pump plate structure is upgraded to the guide ring structure of the invention, and water quality is respectively sampled and detected before and after the water passes through the guide ring. Then an internal thread circular ring is additionally arranged, and then water quality is sampled and detected before the water source passes through the internal thread circular ring and after the water source leaves the flow guide ring. The sampling test for each structure was 10 consecutive samples and averaged, the results are shown in the following table:
table 1: water quality filtering effect meter
As can be seen from the above table, the improved structure has a significant effect on the impurity filtering effect compared with the prior art. The filtering effect is even unexpected to those skilled in the art.
The above-mentioned embodiments are only for convenience of description, and are not intended to limit the present invention in any way, and those skilled in the art will understand that the technical features of the present invention can be modified or changed by other equivalent embodiments without departing from the scope of the present invention.
Claims (8)
1. A mixed flow type unit top cover water taking and pressure regulating device with a filtering function comprises a runner upper crown (2) fixed at the lower end of a main shaft (1) and a top cover (3) arranged on the periphery of the runner upper crown (2), and is characterized in that the inner side wall of the top cover (3) is matched with the outer side wall of the runner upper crown (2) to form a water inlet gap (4) communicated with a flow channel;
the upper end face of a runner crown (2) on the side of a main shaft (1) is provided with a plurality of first filtering rings (2a) at intervals along the circumferential direction, the inner top of a top cover (3) is provided with a flow guide ring (5), and the flow guide ring (5) consists of a bottom ring (5a) fixed on the inner top of the top cover (3) and second filtering rings (5b) vertically arranged on the bottom ring (5a) and matched with the first filtering rings (2 a); the first filtering ring (2a) and the second filtering ring (5b) are matched to form a filtering water channel (6) with an S-shaped vertical loading surface; a water taking connector (7) communicated with the filtering water channel (6) is arranged on the top cover (3), and the water taking connector (7) is communicated and connected with a cooling water pipe (8);
a main shaft sealing unit (9) is arranged at the upper end of the top cover (3), and a main shaft bushing (10) matched with the main shaft sealing unit (9) is arranged on the main shaft (1); the second filter ring (5b) positioned at the inner end is matched with the outer wall of the upper crown (2) of the rotating wheel and the outer wall of the lower end of the main shaft (1) to form a leakage gap (11), the leakage gap (11) is communicated with the main shaft sealing unit (9), and water passing through the leakage gap (11) enters the main shaft sealing unit to serve as main shaft sealing water.
2. The mixed flow type unit top cover water taking and pressure regulating device with the filtering function according to claim 1, wherein an internal thread circular ring (4a) is detachably connected to the inner side wall of the top cover (3) corresponding to the annular water inlet gap (4); the thread pitch of the upper thread of the internal thread ring (4a) is 10-15mm, and the thread lead angle is 10-20 degrees; the internal thread ring (4a) is matched with the outer side wall of the runner crown (2) to form an annular water inlet gap (4) which is communicated with the runner and is provided with an internal thread wall; the distance between the narrowest parts of the annular water inlet gaps (4) is 2-5mm, and the distance between the widest parts is 5-10mm larger than that between the narrowest parts.
3. The mixed flow type unit top cover water taking and pressure regulating device with the filtering function as claimed in claim 1, wherein the number of the first filtering rings (2a) is two; the number of the second filtering rings (5b) is three, the two second filtering rings (5b) positioned at the outer side and the two first filtering rings (2a) are arranged in a staggered manner, the distance between the two second filtering rings (5b) positioned at the outer side and the adjacent first filtering rings (2a) is 2-5mm, and the distance between the second filtering ring (5b) positioned at the inner end and the adjacent first filtering rings (2a) is 80-100 mm;
the two second filtering rings (5b) positioned at the outer side and the two first filtering rings (2a) are matched to form an S-shaped rapid water channel (12), the second filtering ring (5b) positioned at the inner end is matched with the adjacent first filtering ring (2a) to form a pressure stabilizing water channel (13), and the rapid water channel (12) and the pressure stabilizing water channel (13) are matched to form a filtering water channel (6); the water inlet of the water taking connector (7) is communicated with the pressure stabilizing water channel (13).
4. The mixed flow type unit top cover water taking and pressure regulating device with the filtering function as claimed in claim 1 or 3, wherein the width of the leakage gap (11) is 2-5 mm.
5. The mixed flow type unit top cover water taking and pressure regulating device with the filtering function as claimed in claim 1, wherein a first water discharging pipe (14) is connected to a cooling water pipe (8) at the side of the water taking joint (7) in a conduction manner, and automatic pressure regulating valves (14a) are respectively arranged on the cooling water pipe (8) and the first water discharging pipe (14); and the cooling water pipe (8) is respectively communicated with cooling pipelines in the water guide bearing (15), the lower guide bearing (16), the air cooler (17) and the upper guide thrust bearing (18), and the cooling water in the cooling water pipe (8) enters each cooling pipeline to absorb heat, then flows back to the cooling water pipe and is discharged to tail water from a water outlet end.
6. The mixed flow type unit top cover water taking and pressure regulating device with the filtering function is characterized in that the main shaft sealing unit (9) consists of an overhaul sealing seat (9a) arranged at the upper end of the top cover (3), an overhaul sealing ring (9b) arranged in the overhaul sealing seat (9a) and matched with the main shaft bushing (10), a sealing seat (9c) fixedly arranged on the overhaul sealing seat (9a) and positioned at the periphery of the main shaft bushing (10), a plurality of annular grooves (9d) axially arranged at intervals on the inner wall of the sealing seat (9c), a second drain pipe (9e) in communication connection with the annular groove (9d) at the uppermost end, and V-shaped composite sealing rings (9f) arranged in the rest annular grooves (9d) and matched and sealed with the main shaft bushing (10); the water outlet end of the second water outlet pipe (9e) is communicated with tail water; an antiwear ring (19) which is contacted with the main shaft bushing (10) is arranged on the inner wall of the sealing seat (9c) at the side of the annular groove (9 d).
7. The mixed flow type unit top cover water taking and pressure regulating device with the filtering function is characterized in that the maintenance sealing seat (9a) consists of a first sealing ring (9g) fixedly connected with the upper end of the top cover (3) and a second sealing ring (9h) fixedly connected with the first sealing ring (9g) through a screw; a first annular sealing groove (9i) is formed in the upper end face of the first sealing ring (9g) close to the upper end portion of the main shaft bushing (10), a second annular sealing groove (9j) matched with the first annular sealing groove (9i) is formed in the second sealing ring (9h), the first annular sealing groove (9i) and the second annular sealing groove (9j) are matched to form a third annular sealing groove, the opening of the third annular sealing groove faces the main shaft bushing (10), the axial section of the third annular sealing groove is small outside and large inside, the overhaul sealing ring (9b) is arranged in the third annular sealing groove, the axial section of the overhaul sealing ring (9b) in the initial state is in a shape which is suitable for the third annular sealing groove and the outer end of the overhaul sealing ring is not in contact with the main shaft bushing (10); a fourth annular sealing groove is formed in the contact part of the first sealing ring (9g) and the second sealing ring (9h) on the side edge of the third annular sealing groove, and a sealing rubber ring is arranged in the fourth annular sealing groove;
an arc-shaped groove (9k) is formed in the end face, opposite to the bottom in the third annular sealing groove, of the overhaul sealing ring (9b) along the circumferential direction, a medium through hole (20) opposite to the arc-shaped groove (9k) is formed in the side wall of the third annular sealing groove, a quick connector (21) is connected to the outer end of the medium through hole (20), and the quick connector (21) is connected with an external compressed water source or compressed air source pipeline; when the maintenance is needed, an external compressed water source or a compressed air source enters the third annular sealing groove through a pipeline, and the maintenance sealing ring (9b) is extruded to enable the outer end of the maintenance sealing ring to be in contact with the main shaft bushing (10) for sealing.
8. The mixed flow type unit top cover water taking and pressure regulating device with the filtering function according to claim 1, wherein the lower end of the main shaft (1) is integrally formed with a connecting ring (1a), the connecting ring (1a) is fixedly connected with a runner crown (2) through a bolt, a protective cover (22) is arranged on the connecting ring (1a) at the periphery of the bolt, the outer diameter of the protective cover (22) is the same as that of the connecting ring (1a), a abdicating through hole adaptive to the main shaft (1) is arranged in the middle of the protective cover (22), and the inner diameter of the abdicating through hole is 0.5-1.5mm larger than that of the main shaft (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010138310.5A CN111173667A (en) | 2020-03-03 | 2020-03-03 | Mixed flow type unit top cover water intaking pressure regulating device with filtering capability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010138310.5A CN111173667A (en) | 2020-03-03 | 2020-03-03 | Mixed flow type unit top cover water intaking pressure regulating device with filtering capability |
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| CN111173667A true CN111173667A (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343748A (en) * | 2020-09-23 | 2021-02-09 | 浙江迅和机械制造有限公司 | Water turbine |
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2020
- 2020-03-03 CN CN202010138310.5A patent/CN111173667A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343748A (en) * | 2020-09-23 | 2021-02-09 | 浙江迅和机械制造有限公司 | Water turbine |
| CN112343748B (en) * | 2020-09-23 | 2022-02-11 | 浙江迅和机械制造有限公司 | Water turbine |
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Effective date of registration: 20200612 Address after: 512000 Shiliting Hongyuan Zhongli power generation equipment Co., Ltd., Zhenjiang District, Shaoguan City, Guangdong Province Applicant after: GUANGDONG HONGYUAN ZHONGLI POWER EQUIPMENT Co.,Ltd. Address before: 514000 Guangdong Hongyuan electromechanical Industrial Park, Xinghe line, Xingning City, Meizhou City, Guangdong Province Applicant before: GUANGDONG HONGYUAN ELECTROMECHANICAL Co.,Ltd. |