CN210370810U - Novel hydraulic adjusting and executing mechanism of heavy-duty steam turbine - Google Patents
Novel hydraulic adjusting and executing mechanism of heavy-duty steam turbine Download PDFInfo
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- CN210370810U CN210370810U CN201921595930.0U CN201921595930U CN210370810U CN 210370810 U CN210370810 U CN 210370810U CN 201921595930 U CN201921595930 U CN 201921595930U CN 210370810 U CN210370810 U CN 210370810U
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Abstract
A novel hydraulic adjusting actuating mechanism of a heavy-duty steam turbine relates to the field of steam turbines. The utility model relates to a solve 300MW and above conventional thermal power generating unit long-term service in-process, because the valve rod bears great tensile stress for a long time, lead to the valve rod life-span to shorten, the problem of fatigue fracture phenomenon easily appears. A novel heavily loaded formula steam turbine hydraulic pressure adjusts actuating mechanism, including servomotor and control seat, still include dish spring group and adjusting lever, dish spring group fixes the top of adjusting lever, the top of dish spring group is fixed in the rodless chamber jar tail department of servomotor, when the valve is the complete closure state, dish spring group is natural state, when the valve is the complete open mode, dish spring group is compression state. The utility model discloses a partial hydraulic pressure force has been offset to the spring force, the effectual tensile stress that has reduced the valve and bore when opening the position entirely, has prolonged the life of valve rod.
Description
Technical Field
The utility model relates to a hydraulic pressure of steam turbine adjusts actuating mechanism. Belongs to the field of steam turbines.
Background
The safety and reliability of the steam turbine, which is one of the most important devices in the power generation equipment, play an important role in ensuring the normal operation of the whole unit. The steam turbine adjusts the opening of the valve through the actuating mechanism so as to adjust the steam inlet quantity, so that effective measures are taken to reduce the fault rate of the actuating mechanism, and the method is very necessary in the aspects of ensuring the normal operation of the steam turbine and improving the operation efficiency of an operating unit.
In recent years, the fatigue fracture phenomenon of a valve rod of a regulating valve sometimes occurs in the long-term operation process of a 300MW and above conventional thermal power generating unit. Through analysis, the regulating valve is always in the fully-opened position when the unit operates, and the lifting force of the servomotor reaches the maximum value at the moment. Because the opening direction of the regulating valve adopts a valve limiting mode, the valve rod bears larger tensile stress at the full-opening position of the valve, and the service life of the valve rod is greatly shortened due to long-term operation. In order to solve the problem, the prior art mainly adopts the modes of replacing a valve rod, replacing materials, adjusting heat treatment and the like to improve the strength of the valve rod and reduce the brittleness, but the problem of fatigue fracture of the valve rod is not thoroughly solved because of the influence and the restriction of the structure, the processing technology, the use working condition and other conditions of the valve.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve 300MW and above conventional thermal power generating unit long-term service in-process, because the valve rod bears great tensile stress for a long time, lead to the valve rod life-span to shorten, the problem of fatigue fracture phenomenon easily appears, provide a novel heavily loaded steam turbine hydraulic pressure now and adjust actuating mechanism.
A novel heavily loaded formula steam turbine hydraulic pressure adjusts actuating mechanism, including servomotor and control seat, still include dish spring group and adjusting lever, the bottom of dish spring group is fixed the top of adjusting lever, the top of dish spring group is fixed in the rodless chamber jar tail department of servomotor, when the valve is the complete closure state, dish spring group is natural state, when the valve is the complete open mode, dish spring group is compression state.
And the top of the disc spring group is fixed at the tail of a rodless cavity cylinder of the servomotor through the base.
Furthermore, the disc spring set further comprises a connecting plate, and the disc spring set is fixed to the top of the adjusting rod through the connecting plate.
Further, the oil-saving device also comprises a throttle valve, wherein the throttle valve is arranged in the oil engine buffer area and used for adjusting the oil discharge amount of the oil engine buffer area.
The utility model provides a pair of novel heavily loaded formula steam turbine hydraulic pressure adjusts actuating mechanism, and actuating mechanism is adjusted in relative transmission has offset partial hydraulic pressure force through the spring force, the effectual tensile stress that has reduced the valve rod and bear when opening the position entirely to prevent because the tensile stress too big and lead to the emergence of valve rod fatigue fracture's phenomenon, prolonged the life of valve rod. In addition, a flow adjusting throttle valve is additionally arranged in a buffer area of a rod cavity of the servomotor, so that when the adjusting valve is quickly closed, the aim of protecting the valve and the valve rod from being damaged by impact can be achieved by adjusting the oil discharge amount of the buffer area of the servomotor, and the service life of the valve rod is further prolonged.
Drawings
Fig. 1 is a schematic structural view of a conventional regulator valve actuator in the background art, in which 2 denotes a regulator valve and 3 denotes a valve stem;
FIG. 2 is a schematic structural diagram of a novel hydraulic adjusting actuator of a heavy-duty turbine according to an embodiment;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is an elevational view of the operating seat portion of the new heavy duty steam turbine hydraulic modulating actuator;
FIG. 5 is a side view of the operating seat portion of the new heavy duty turbine hydraulic adjustment actuator;
fig. 6 is a schematic diagram of a hydraulic pressure regulating actuator of a novel heavy-duty turbine according to an embodiment, wherein 15 denotes a travel switch, 16 denotes a demodulator, 17 denotes a valve position control request signal from DEH, 18 denotes a servo amplifier, 19 denotes a high-pressure oil inlet, 20 denotes a pressure oil return port, and 21 denotes an OPC quick oil shut-off port.
Detailed Description
The first embodiment is as follows: the present embodiment is specifically described with reference to fig. 1 to 6. The hydraulic adjusting and actuating mechanism of the heavy-duty steam turbine can be divided into two parts: the hydraulic oil engine 7 and the operating seat 9, the opening process of the valve is realized by the hydraulic oil engine 7, the closing process is realized by a disc spring 10 in the operating seat, a travel switch 12 is arranged on the operating seat 9 and used for indicating the full opening position and the full closing position of the valve, and a dual redundant displacement sensor 11 is used for feeding back a valve position signal of the valve.
In the embodiment, a disc spring group 5 and an adjusting rod 6 are arranged at the tail (full-open side) of a rodless cavity cylinder in an oil-operated machine 7, the bottom of the disc spring group 5 is fixed at the top of the adjusting rod 7 through a connecting plate 13, the top of the disc spring group 5 is fixed at the tail of the rodless cavity cylinder of the oil-operated machine through a base 14, and a flow adjusting throttle valve 8 is arranged in a rod cavity cylinder head buffer area of the oil-operated machine 7, wherein the adjusting rod needs to be provided with a certain amount of adjusting allowance. After actuating mechanism and valve are connected well according to the design requirement, pull down servomotor rear end cap 4, take out dish spring group 5 and adjusting lever 6, through the adjustment allowance part of grinding adjustment tip (the little head part in bottom of adjusting lever 6 promptly), guarantee that valve dish spring group 5 has certain compressive capacity when the full open position, thereby make dish spring group 5 can offset reasonable hydro-cylinder hydraulic pressure power, make valve rod tensile stress control in the required scope, when guaranteeing the normal regulation aperture of valve, can avoid the emergence of valve rod fatigue fracture phenomenon. By reasonably designing the parameters of the disc spring group 5 and the adjusting rod 6, the disc spring group 5 can play a damping role of about 10 tons (the damping size can be adjusted according to different models) in the last 3mm process of full opening of the valve. When the valve is quickly closed, the oil discharge amount of the buffer area of the servomotor can be adjusted by controlling the throttle valve 8, so that the phenomenon that the valve and a valve rod are damaged due to overlarge impact is prevented.
Claims (4)
1. The utility model provides a novel heavily loaded formula steam turbine hydraulic pressure adjusts actuating mechanism, includes servomotor and control seat, its characterized in that still includes dish spring group and adjusting lever, the bottom of dish spring group is fixed the top of adjusting lever, the top of dish spring group is fixed in the rodless chamber jar tail department of servomotor, and when the valve was the complete closure state, dish spring group is natural state, when the valve was the complete opening state, dish spring group was compression state.
2. The novel hydraulic adjusting actuator of heavy-duty steam turbine as claimed in claim 1, further comprising a base, wherein the top of the disc spring set is fixed at the tail of the rodless cavity cylinder of the servomotor through the base.
3. The novel hydraulic adjusting actuator for heavy-duty steam turbines according to claim 1 or 2, further comprising a connecting plate, wherein the disc spring set is fixed on the top of the adjusting rod through the connecting plate.
4. The new hydraulic regulating actuator for heavy duty steam turbines as claimed in claim 1 further comprising a throttle valve installed in the buffer area of the servomotor for adjusting the amount of oil discharged from the buffer area of the servomotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921595930.0U CN210370810U (en) | 2019-09-24 | 2019-09-24 | Novel hydraulic adjusting and executing mechanism of heavy-duty steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921595930.0U CN210370810U (en) | 2019-09-24 | 2019-09-24 | Novel hydraulic adjusting and executing mechanism of heavy-duty steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210370810U true CN210370810U (en) | 2020-04-21 |
Family
ID=70256010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921595930.0U Active CN210370810U (en) | 2019-09-24 | 2019-09-24 | Novel hydraulic adjusting and executing mechanism of heavy-duty steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210370810U (en) |
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2019
- 2019-09-24 CN CN201921595930.0U patent/CN210370810U/en active Active
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