CN104121043A - Mechanical centrifugal type runaway protection device of turbine - Google Patents
Mechanical centrifugal type runaway protection device of turbine Download PDFInfo
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- CN104121043A CN104121043A CN201410337312.1A CN201410337312A CN104121043A CN 104121043 A CN104121043 A CN 104121043A CN 201410337312 A CN201410337312 A CN 201410337312A CN 104121043 A CN104121043 A CN 104121043A
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- oil
- rotating shaft
- sealing cover
- radial hole
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Abstract
The invention discloses a mechanical centrifugal type runaway protection device of a turbine. An oil inlet cavity is formed in the end face of a rotary shaft and communicated with an oil outlet through an oil inlet, the oil inlet cavity is also communicated with the oil control end of an air inlet valve and is in clearance fit with the right portion of an oil inlet nozzle, and an oil inlet connector is installed in a center hole of a small flange and is communicated with an oil pump through an oil inlet pipe; a radial hole is formed in the rotary shaft, a bolt is sequentially sleeved with an adjusting shim and a reset spring and then is inserted into the radial hole, the rod portion of the bolt extends to the outside of the radial hole and then is sequentially sleeved with a sealing cover and a locking nut, the end face of the sealing cover is attached to the outer circular surface of the rotary shaft, and an oil storage groove in the inner surface of the sealing cover is communicated with the outer end of the oil outlet. According to the mechanical centrifugal type runaway protection device of the turbine, the oil pressure of the oil control end of the air inlet valve is controlled by controlling the state of the sealing cover, and then runaway protection is achieved. The protection device does not need electricity for work and is high in reliability.
Description
Technical field
The invention belongs to steam turbine field, specifically, relate in particular to a kind of mechanical centrifugal formula driving protective gear of steam turbine.
Background technique
Rotating shaft is one of important composition parts of steam turbine; in order to guarantee that the safe operation of rotating shaft is set with the highest safe speed of rotation in advance; once surpassing the highest safe speed of rotation of design, the actual speed of rotating shaft just easily causes security incident, therefore need to be for the rotating shaft design driving protective gear of steam turbine.It should be noted that, the opening degree size of the actual speed of rotating shaft and suction valve valve is closely related, and when the opening degree of suction valve valve reduces, the actual speed of rotating shaft reduces.And suction valve carries the parallel control system of two covers and is used for the opening degree of control valve, if wherein a set of control system just work can control valve opening degree.First set control system is electronic type structure, and it realizes control by control signal; A set of control system is mechanical structure in addition, and it carrys out control valve opening degree by the oil pressure of oil circuit control and the elastic force of spring, and when the oil pressure of oil circuit control is less than spring force, the opening degree of suction valve valve reduces, thereby causes the actual speed of rotating shaft to reduce.
Existing driving protective gear mainly contains two kinds of structural types: the first is electronic type structure; adopt a speed probe to detect the actual speed of rotating shaft; the data transmission that speed probe collects is to control system; once the actual speed that speed probe collects surpasses the highest safe speed of rotation setting in advance; control system is sent control signal; this control signal can reduce the opening degree of suction valve valve, thereby the actual speed of rotating shaft is reduced in the highest safe speed of rotation.Although the driving protective gear of this structural type is simple in structure; but speed probe can not worked under power failure state; driving protective gear had now just lost efficacy so, if the actual speed of at this moment rotating shaft surpasses the highest safe speed of rotation, so just very easily caused security incident.As seen from the above, the driving protective gear reliability of electronic type structure is poor.
The second is mechanical collision formula structure; the core of this protection structure is: when the actual speed of rotating shaft surpasses after the highest safe speed of rotation; one end that collision part can collide lever in rotating shaft; the rotation of this lever drives after the motion of adjacent machinery, hydraulic unit; collision energy is changed into the energy that suction valve oil circuit control oil pressure is reduced; so just can reduce the opening degree of suction valve valve, thereby also can make the actual speed of rotating shaft be reduced in the highest safe speed of rotation.Although the driving protective gear reliability of this structural type increases, structure is very complicated, manufactures and assembling difficulty, the more important thing is that collision exists potential safety hazard, so its Security is a very important problem.In order to improve crashworthiness, this protective gear is applicable to the situation that rotating shaft rotating speed is lower, so the Applicable scope of this driving protective gear also has narrow limitation.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of reliable, safe steam turbine mechanical centrifugal formula driving protective gear.
Technological scheme of the present invention is as follows: a kind of mechanical centrifugal formula driving protective gear of steam turbine, comprise rotating shaft (1) and suction valve, it is characterized in that: the end face of described rotating shaft (1) has an oil suction chamber (1a) along shaft axis, this oil suction chamber is communicated with the inner of oil outlet (1c) by an oil inlet hole (1b), rotating shaft (1) periphery is run through in the outer end of this oil outlet, and oil suction chamber (1a) is communicated with the control oil end of described suction valve by oil pipe; Described oil suction chamber (1a) while and oil intake nozzle (2) right part Spielpassung, its gap value is 0.03-0.05mm, the plate-like assembly department of this oil intake nozzle left end is clamped between large flange plate (3) and small flange plate (4), these two flange plate are bolted, and large flange plate (3) is bolted on casing (5); A fuel inlet fitting (6) is housed in the center hole of described small flange plate (4), and this fuel inlet fitting is communicated with oil pump by oil inlet pipe;
In described rotating shaft (1), have a radial hole (1d), this radial hole is by the shaft axis of rotating shaft (1), and radial hole (1d) is 3 stops shoulder hole, bolt (7) is set with successively to be adjusted after pad (8) and reset spring (9), insert in radial hole (1d), wherein adjust pad (8) by the step surface axial limiting of radial hole large footpath section and central diameter section junction; Fit with adjusting pad (8) in described reset spring (9) one end, the step surface axial limiting of the other end of this reset spring and described radial hole (1d) central diameter section and path section junction; The bar portion of described bolt (7) reaches behind radial hole (1d) outside, be set with successively sealing cover (10) and locking nut (11), the wherein end face of sealing cover (10) and the laminating of described rotating shaft (1) periphery, and the oil storage grooves (10a) on sealing cover (10) internal surface communicates with the outer end of described oil outlet (1c).
The present invention is on the basis of existing rotating shaft (1) and suction valve, the end face of described rotating shaft (1) has an oil suction chamber (1a) along shaft axis, this oil suction chamber is communicated with the inner of oil outlet (1c) by an oil inlet hole (1b), rotating shaft (1) periphery is run through in the outer end of this oil outlet, and oil suction chamber (1a) is communicated with the control oil end of described suction valve by oil pipe; Described oil suction chamber (1a) while and oil intake nozzle (2) right part Spielpassung, its gap value is 0.03-0.05mm, the plate-like assembly department of this oil intake nozzle left end is clamped between large flange plate (3) and small flange plate (4), these two flange plate are bolted, and large flange plate (3) is bolted on casing (5); A fuel inlet fitting (6) is housed in the center hole of described small flange plate (4), and this fuel inlet fitting is communicated with oil pump by oil inlet pipe;
In described rotating shaft (1), have a radial hole (1d), this radial hole is by the shaft axis of rotating shaft (1), and radial hole (1d) is 3 stops shoulder hole, bolt (7) is set with successively to be adjusted after pad (8) and reset spring (9), insert in radial hole (1d), wherein adjust pad (8) by the step surface axial limiting of radial hole large footpath section and central diameter section junction; Fit with adjusting pad (8) in described reset spring (9) one end, the step surface axial limiting of the other end of this reset spring and described radial hole (1d) central diameter section and path section junction; The bar portion of described bolt (7) reaches behind radial hole (1d) outside, be set with successively sealing cover (10) and locking nut (11), the wherein end face of sealing cover (10) and the laminating of described rotating shaft (1) periphery, and the oil storage grooves (10a) on sealing cover (10) internal surface communicates with the outer end of described oil outlet (1c).
When steam turbine starts normally to work, pilot pressure oil enters in oil suction chamber (1a), oil inlet hole (1b), oil outlet (1c) and oil storage grooves (10a) by oil pump and fuel inlet fitting (6), and oily end of control that simultaneously enters described suction valve by oil pipe, at this moment oil pressure keeps homeostasis, in pressurize situation, the steam inlet valve of steam turbine is opened, and steam turbine is normally worked.
When the actual speed of turbine rotor exceeds predefined the highest safe speed of rotation, centrifugal force increase because of sealing cover (10), be greater than the pretightening force that reset spring (9) is set up, bolt (7), adjustment pad (8), sealing cover (10) and locking nut (11) integral body are outwards slided, because centrifugal force sharply increases, sealing cover (10) and rotating shaft (1) are hightailed, and the disengaging interval S between sealing cover (10) and rotating shaft (1) equal the movable distance of described adjustment pad (8).
After sealing cover (10) departs from rotating shaft (1); oil pressure in oil suction chamber (1a), oil inlet hole (1b), oil outlet (1c) and oil storage grooves (10a) declines rapidly; and the oil pressure that suction valve is controlled oil end also synchronously declines; thereby the open degree of described steam inlet valve valve is reduced; until close; and then the actual speed of described rotating shaft (1) is got back in the highest safe speed of rotation, thereby steam turbine is played to driving protective action.When the actual speed of described rotating shaft (1) drops in the highest safe speed of rotation, the centrifugal force of sealing cover (10) diminishes, the compressive force that now sealing cover (10) is subject to reset spring (9) is greater than centrifugal force, thereby sealing cover (10) is fitted with described rotating shaft (1) periphery again, and steam turbine is normally worked again.
It is to be noted, because rotating shaft (1) is high speed rotating part, therefore so just need to reach dynamic balancing, described oil suction chamber (1a) is offered along the shaft axis of rotating shaft (1), and the thickness that can adjust pad (8) by adjusting facilitates, effectively realizes dynamic balancing.
Adopt above technological scheme; the present invention is mechanical centrifugal formula structure; it controls by the state of described sealing cover (10) oil pressure that suction valve is controlled oil end; thereby reach the object of driving protection; during the work of this protective gear, do not need to consume electric energy; reliability is high; and the working method of working method of the present invention and original mechanical collision formula protective gear also has fundamental difference; its Security is higher; applicable speed range is also unrestricted; and this protective gear is simple in structure, manufacture and assemble easily, there is good practicability.
As preferably, described oil inlet hole (1b) is communicated with two oil outlets (1c), these two oil outlets (1c) are symmetricly set on the both sides of described bolt (7), and the outer end of each oil outlet (1c) communicates with the upper corresponding oil storage grooves (10a) of described sealing cover (10) respectively.
Adopt above structure, the present invention can guarantee sealing cover (10) stress balance, thereby makes sealing cover (10) mobile smooth and easy, flexible.
Beneficial effect: the present invention is mechanical centrifugal formula structure; it controls by the state of described sealing cover (10) oil pressure that suction valve is controlled oil end; thereby reach the object of driving protection; during the work of this protective gear, do not need to consume electric energy; reliability is high; and the working method of working method of the present invention and original mechanical collision formula protective gear also has fundamental difference; its Security is higher; applicable speed range is also unrestricted; and this protective gear is simple in structure; manufacture and assemble easily, there is good practicability.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is that the A-A of Fig. 1 is to sectional view.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, 2; a mechanical centrifugal formula driving protective gear for steam turbine, mainly consists of rotating shaft 1, suction valve, oil intake nozzle 2, large flange plate 3, small flange plate 4, casing 5, fuel inlet fitting 6, bolt 7, adjustment pad 8, reset spring 9, sealing cover 10 and locking nut 11.Wherein, the end face of described rotating shaft 1 has an oil suction chamber 1a along shaft axis, and this oil suction chamber 1a is communicated with the inner of oil outlet 1c by the oil inlet hole 1b of " ten " font, and rotating shaft 1 periphery is run through in the outer end of this oil outlet 1c, and oil outlet 1c is radial hole.Meanwhile, described oil suction chamber 1a is communicated with the control oil end of suction valve (not shown in FIG.) by oil pipe, its objective is the oil pressure obtaining herein, and with this oil pressure, controls the open degree of suction valve valve.Certainly, also can obtain oil pressure from other positions, such as described oil inlet hole 1b or oil outlet 1c place, be not limited to oil suction chamber 1a place.
Described oil intake nozzle 2 right parts insert in the oil suction chamber 1a of rotating shaft 1, and oil intake nozzle 2 and oil suction chamber 1a Spielpassung, and its gap value is 0.03-0.05mm, so just can guarantee that oil intake nozzle 2 and oil suction chamber 1a can relatively rotate, and can guarantee oil-feed.The plate-like assembly department of described oil intake nozzle 2 left ends is clamped between large flange plate 3 and small flange plate 4, and these two flange plate are bolted, and large flange plate 3 is bolted on casing 5.A fuel inlet fitting 6 is housed in the center hole of described small flange plate 4, and this fuel inlet fitting 6 is communicated with oil pump (not shown in FIG.) by oil inlet pipe, thereby carries out fuel feeding by oil pump.
From Fig. 1,2, can find out, in described rotating shaft 1, have a radial hole 1d, this radial hole 1d is by the shaft axis of rotating shaft 1, and radial hole 1d is 3 stops shoulder hole.Described bolt 7 is set with successively to be adjusted after pad 8 and reset spring 9, inserts in radial hole 1d, wherein adjusts pad 8 by the step surface axial limiting of radial hole large footpath section and central diameter section junction.Fit with adjusting pad 8 in described reset spring 9 one end, the step surface axial limiting of the other end of this reset spring 9 and described radial hole 1d central diameter section and path section junction.The bar portion of described bolt 7 reaches behind radial hole 1d outside, be set with successively sealing cover 10 and locking nut 11, the wherein end face of sealing cover 10 and described rotating shaft 1 periphery laminating, and the oil storage grooves 10a on sealing cover 10 internal surfaces communicates with the outer end of described oil outlet 1c.
As preferably, described oil inlet hole 1b is communicated with two oil outlet 1c, and these two oil outlet 1c are symmetricly set on the both sides of described bolt 7, and the outer end of each oil outlet 1c communicates with an oil storage grooves 10a corresponding on described sealing cover 10 respectively.And the cross section of described oil storage grooves 10a is semicircle, the shape of oil storage grooves 10a is not do particular restriction certainly.
The foregoing is only preferred embodiment of the present invention, not take the present invention as restriction, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. the mechanical centrifugal formula driving protective gear of a steam turbine, comprise rotating shaft (1) and suction valve, it is characterized in that: the end face of described rotating shaft (1) has an oil suction chamber (1a) along shaft axis, this oil suction chamber is communicated with the inner of oil outlet (1c) by an oil inlet hole (1b), rotating shaft (1) periphery is run through in the outer end of this oil outlet, and oil suction chamber (1a) is communicated with the control oil end of described suction valve by oil pipe; Described oil suction chamber (1a) while and oil intake nozzle (2) right part Spielpassung, its gap value is 0.03-0.05mm, the plate-like assembly department of this oil intake nozzle left end is clamped between large flange plate (3) and small flange plate (4), these two flange plate are bolted, and large flange plate (3) is bolted on casing (5); A fuel inlet fitting (6) is housed in the center hole of described small flange plate (4), and this fuel inlet fitting is communicated with oil pump by oil inlet pipe;
In described rotating shaft (1), have a radial hole (1d), this radial hole is by the shaft axis of rotating shaft (1), and radial hole (1d) is 3 stops shoulder hole, bolt (7) is set with successively to be adjusted after pad (8) and reset spring (9), insert in radial hole (1d), wherein adjust pad (8) by the step surface axial limiting of radial hole large footpath section and central diameter section junction; Fit with adjusting pad (8) in described reset spring (9) one end, the step surface axial limiting of the other end of this reset spring and described radial hole (1d) central diameter section and path section junction; The bar portion of described bolt (7) reaches behind radial hole (1d) outside, be set with successively sealing cover (10) and locking nut (11), the wherein end face of sealing cover (10) and the laminating of described rotating shaft (1) periphery, and the oil storage grooves (10a) on sealing cover (10) internal surface communicates with the outer end of described oil outlet (1c).
2. the mechanical centrifugal formula driving protective gear of steam turbine according to claim 1; it is characterized in that: described oil inlet hole (1b) is communicated with two oil outlets (1c); these two oil outlets (1c) are symmetricly set on the both sides of described bolt (7), and the outer end of each oil outlet (1c) communicates with the upper corresponding oil storage grooves (10a) of described sealing cover (10) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410337312.1A CN104121043B (en) | 2014-07-16 | 2014-07-16 | A kind of mechanical centrifugal formula runaway protector of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410337312.1A CN104121043B (en) | 2014-07-16 | 2014-07-16 | A kind of mechanical centrifugal formula runaway protector of steam turbine |
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| Publication Number | Publication Date |
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| CN104121043A true CN104121043A (en) | 2014-10-29 |
| CN104121043B CN104121043B (en) | 2016-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410337312.1A Active CN104121043B (en) | 2014-07-16 | 2014-07-16 | A kind of mechanical centrifugal formula runaway protector of steam turbine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131173A (en) * | 2018-02-06 | 2018-06-08 | 中国船舶重工集团公司第七0四研究所 | It is peculiar to vessel can on-line tuning formula hypervelocity protective device |
| CN110273717A (en) * | 2019-07-22 | 2019-09-24 | 浙江华元汽轮机械有限公司 | Turbomachinery and its mechanical axial displacement limiting device |
| CN113565582A (en) * | 2021-07-08 | 2021-10-29 | 中国航发湖南动力机械研究所 | Mechanical type rotor overrotation protection sensor device |
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| CN203978522U (en) * | 2014-07-16 | 2014-12-03 | 重庆齿轮箱有限责任公司 | The mechanical centrifugal formula driving protective gear of steam turbine |
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2014
- 2014-07-16 CN CN201410337312.1A patent/CN104121043B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5553704A (en) * | 1978-10-13 | 1980-04-19 | Aisin Warner Ltd | Governor valve |
| GB2066933A (en) * | 1980-01-07 | 1981-07-15 | Sour Jugoturbina Ro Tvornica P | Improvements in or relating to hydraulic speed governors |
| SU1195339A1 (en) * | 1983-09-30 | 1985-11-30 | Vladimir V Zuev | Centrifugal transducer of rotational speed |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131173A (en) * | 2018-02-06 | 2018-06-08 | 中国船舶重工集团公司第七0四研究所 | It is peculiar to vessel can on-line tuning formula hypervelocity protective device |
| CN108131173B (en) * | 2018-02-06 | 2024-01-26 | 中国船舶集团有限公司第七〇四研究所 | On-line adjustable overspeed protector for ship |
| CN110273717A (en) * | 2019-07-22 | 2019-09-24 | 浙江华元汽轮机械有限公司 | Turbomachinery and its mechanical axial displacement limiting device |
| CN110273717B (en) * | 2019-07-22 | 2024-03-12 | 浙江华元汽轮机械有限公司 | Turbine machine and mechanical axial displacement protection device thereof |
| CN113565582A (en) * | 2021-07-08 | 2021-10-29 | 中国航发湖南动力机械研究所 | Mechanical type rotor overrotation protection sensor device |
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| Publication number | Publication date |
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| CN104121043B (en) | 2016-03-23 |
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