CN205078290U - Steam turbine prevent device that exceeds speed limit - Google Patents
Steam turbine prevent device that exceeds speed limit Download PDFInfo
- Publication number
- CN205078290U CN205078290U CN201520517664.5U CN201520517664U CN205078290U CN 205078290 U CN205078290 U CN 205078290U CN 201520517664 U CN201520517664 U CN 201520517664U CN 205078290 U CN205078290 U CN 205078290U
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- China
- Prior art keywords
- push rod
- gag lever
- lever post
- end cap
- impact head
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Abstract
The utility model provides a steam turbine prevent device that exceeds speed limit, personally experiences sth. Part of the body and the push rod including holding, seal with end cover I, end cover II respectively at the both ends of the end body. The push rod runs through end cover I, the end body and end cover II, the both ends of push rod all are provided with the striking head. The push rod is the notch cuttype, and the cover is equipped with a compression spring on it. Radially be provided with the gag lever post that is the notch cuttype in the end cover II, gag lever post path end passes end cover III and a location iron and a threaded connection portable head on the end cover II, and the path pot head of gag lever post is equipped with the 2nd compression spring, be provided with the constant head tank on the push rod, during normal speed, the big footpath section tip of gag lever post is contradicted with the push rod outer peripheral face. During the hypervelocity, the steam turbine exceeds the speed limit, and the flyweight hits the striking head near flyweight one end, makes the push rod move, constant head tank joint on the big footpath of gag lever post section tip and push rod, and the striking head of keeping away from the flyweight will trigger pneumatic valve as the signal source and realize the speed limit, twist portable head, and the gag lever post restores to the throne, and the push rod restores to the throne simultaneously.
Description
Technical field
The utility model belongs to anti-overspeed protection field, be specifically related to a kind of flyball with steam turbine with the use of overspeed preventer.
Background technology
Along with national economy further develop and development of the West Regions, transferring electricity from the west to the east policy enforcement bring huge market and development opportunity to China's turbine making industry.The hypervelocity of steam turbine can bring destructive disaster, therefore, prevents Steam Turbine Over-speed Accident particularly crucial.The mode mostly adopting oil to drive in prior art realizes moving left and right of push rod device.For in prior art, the anti-hypervelocity of steam turbine is made up of flyball and push rod device, and push rod device oil drives, and complex structure, cost are high, difficult sealing.
Utility model content
In order to solve the existing push rod device using oil to drive, its complex structure, sealing difficulty, the problem that cost of manufacture is high, the utility model provides a kind of overspeed preventer, drives push rod to change air driven into oil, this device is placed in atmospheric environment, just can realize the function of anti-hypervelocity.
The utility model is achieved through the following technical solutions:
An overspeed preventer for steam turbine, is characterized in that: comprise push rod and end body, one end of described push rod arranges the first impact head, and the other end arranges the second impact head; In a tubular form, it is enclosed within described push rod described end body; Described end body arranges end cap I sealing near the end of the first impact head, and described end body arranges end cap II sealing near the end of the second impact head; Described push rod runs through described end cap I, end cap II, and respectively with end cap I, end cap II matched in clearance; The endoporus of described end body is notch cuttype, its large footpath section is adjacent with end cap II, described push rod is provided with a limited step, this limited step is positioned at the large footpath section of end body endoporus, and being limited in the hole shoulder of end body endoporus, be provided with the first Compress Spring between this limited step and end cap II, this first Compress Spring is enclosed within described push rod, under normal condition, this first Compress Spring is in compressive state;
Described end cap II is disposed radially the installing hole installing described gag lever post, the aperture of described installing hole arranges the sealing of an end cap III, and described gag lever post part is positioned at described installing hole; The outer peripheral face of described gag lever post is notch cuttype, the path section of gag lever post is through end cap III and end cap III matched in clearance, the large footpath section of gag lever post and the hole wall matched in clearance of installing hole, sheathed second Compress Spring in the path section of described gag lever post, the two ends of the second Compress Spring are limited in the shaft shoulder of end cap III, gag lever post; The end thread of the path section of described gag lever post connects portable head;
Described push rod outer peripheral face arranges a locating slot; When not exceeding the speed limit, the end of described gag lever post large footpath section and the outer peripheral face of described push rod are conflicted; During hypervelocity, described gag lever post moves axially along end body to the direction of the second impact head b, and the locating slot that the end to described gag lever post large footpath section embeds on described push rod is interior to push rod axial limiting.
Further, described end cap II near the end face part of described end body to extend in the large footpath section of described end body endoporus and with the hole wall matched in clearance of this large footpath section, for radial spacing to end cap II, and the limited step on the end face of this extension of end cap II and described push rod leaves distance.
Further, described end body is provided with thrust ball bearing in the endoporus of described first impact head, and described push rod is through this thrust ball bearing.
Further, described first impact head, the second impact head are threaded in the two ends of described push rod, and described first impact head, the second impact head are connected by holding screw with described push rod in the direction perpendicular to described push rod.
Further, described end cap I is connected with described end body by bolt.
Further, described end cap II protrudes to the direction away from end body away from the end face of described end body, and the endoporus of this convex section is provided with cylinder sleeve, and described cylinder sleeve to be enclosed within described push rod and matched in clearance.
The beneficial effects of the utility model:
Overspeed preventer for steam turbine of the present utility model, this overspeed preventer is placed in air, does not need oil to drive, and comparatively with the overspeed preventer that oil drives, the sealing requirements of overspeed preventer of the present utility model reduces greatly, is more prone to realize.This overspeed preventer realizes the reset of push rod by spring sheathed on push rod, realizes push rod axial displacement spacing by gag lever post and push rod clamping; Gag lever post is also arranged with spring simultaneously, realizes the reset of gag lever post, gag lever post is provided with portable head; This practical new apparatus structure is simple.After Steam Turbine Over-speed Accident, flyball hits collision first impact head, promotes push rod and moves axially away from flyball, and the stopper slot that the top to gag lever post embeds on push rod realizes axial limiting to push rod, now the second impact head touches pneumatic operated valve, thus realizes the object to steam turbine speed limit.Twist portable head, under the effect of the second Compress Spring simultaneously on gag lever post, make gag lever post increase, make the locating slot on the top disengaging push rod of gag lever post, return under the effect of the first Compress Spring that push rod is sheathed thereon flyball knock before position.Overspeed preventer structure of the present utility model is simple, cost of manufacture is low, easy accessibility, with existing flyball with the use of, effectively can prevent Steam Turbine Over-speed Accident.
Accompanying drawing explanation
Fig. 1 is the sectional view of overspeed preventer of the present utility model;
Fig. 2 is the partial enlarged drawing of I in Fig. 1;
Fig. 3 is the sectional view of end cap II;
Fig. 4 is overspeed preventer of the present utility model;
Reference numeral
1-first impact head; 2-second impact head; 3-holding screw; 4-end cap I; 5-thrust ball bearing; 6-holds body; 7-adjusts pad; 8-first Compress Spring; The portable head of 9-; 10-end cap III; 11-detent rail; 12-second Compress Spring; 13-gag lever post; 14-end cap II; 15-steel bushing; 16-push rod; 161-locating slot; 162-positive stop lug boss; A-gear-box; B-flyball; The distance of L-first impact head and flyball; R-flyweight shaft turns to.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, a kind of overspeed preventer of steam turbine, comprise push rod 16 and end body 6, one end of described push rod 16 arranges the first impact head 1, for being clashed into by flyball B; The other end arranges the second impact head 2, for triggering pneumatic operated valve.In a tubular form, it is enclosed within described push rod 16 described end body 6; Described end body 6 arranges end cap I 4 and seals near the end of the first impact head 1, described end cap I 4 is connected with described end body 6 by bolt.Described end body 6 is provided with described end body 6 and is provided with four row thrust ball bearings 5 in the endoporus of described first impact head 1 in the endoporus of described first impact head 1, and described push rod 16 passes this thrust ball bearing and matched in clearance.Described end body 6 arranges end cap II 14 and seals near the end of the second impact head 2.Described end cap II 14 and end body 6 are bolted in gear box A, are provided with adjustment pad 7 between end body 6 and gear box A.Described push rod 16 runs through described end cap I 4, end cap II 14, and respectively with end cap I 4, end cap II 14 matched in clearance.The endoporus of described end body 6 is notch cuttype, its large footpath section is adjacent with end cap II 14, described push rod 16 is provided with a limited step 162, this limited step 162 is positioned at the large footpath section of end body 6 endoporus, and being limited in the hole shoulder of end body 6 endoporus, be provided with the first Compress Spring 8 between this limited step and end cap II 14, this first Compress Spring 8 is enclosed within described push rod 16, under normal condition, this first Compress Spring 8 is in compressive state.
Described end cap II 14 is disposed radially the installing hole 131 installing described gag lever post 13, the aperture of described installing hole 131 end cap III 10 that is threaded seals, the below of described end cap III 10 is provided with detent rail 11, and described gag lever post 13 part is positioned at described installing hole 131.The outer peripheral face of described gag lever post 13 is notch cuttype, and the path section of gag lever post 13 is through end cap III 10 and end cap III 10 matched in clearance, the large footpath section of gag lever post 13 and the hole wall matched in clearance of installing hole 131.In the path section of described gag lever post 13, the two ends of sheathed second Compress Spring 12, second Compress Spring 12 are limited in the shaft shoulder of detent rail 11, gag lever post 13.The end thread of the path section of described gag lever post 13 connects portable 9.
Described push rod 16 outer peripheral face arranges a locating slot 161, and the radial lateral vertical near the second impact head 2 of this locating slot 161 is in described push rod 16, and the radial side near the first impact head 1 of this locating slot 161 tilts to the first impact head 1.The locating slot 161 of the present embodiment is annular groove.Locating slot 161 on the end of described gag lever post 13 large footpath section and described push rod 16 is equipped with.When not exceeding the speed limit, the end of described gag lever post 13 large footpath section and the outer peripheral face of described push rod 16 are conflicted; During hypervelocity, described gag lever post 13 moves axially along end body 6 to the direction of the second impact head 2, and the locating slot 161 that the end to described gag lever post 13 large footpath section embeds on described push rod 16 is interior to push rod 16 axial limiting.
Described end cap II 14 near the end face part of described end body 6 to extend in the large footpath section of described end body 6 endoporus and with the hole wall matched in clearance of this large footpath section, for radial spacing to end cap II 14, and the limited step 162 on the end face of this extension of end cap II 14 and described push rod 16 leaves distance.The other end of described end cap II 14 is protruded to described second impact head 2, and the endoporus of this convex section is provided with cylinder sleeve 15, and for supplemental support push rod 16, described gag lever post 16 is through cylinder sleeve 15 also matched in clearance.
Described first impact head 1, second impact head 2 is threaded in the two ends of described push rod 16, and described first impact head 1, second impact head 2 is connected by holding screw 3 with described push rod 16 in the direction perpendicular to described push rod 16.
The principle of overspeed preventer of the present utility model: the slow-speed shaft of gear box A drives flyball B to rotate, when steam turbine normal speed is run, flyball B and the first impact head 1 are kept at a distance L, and the end of gag lever post 13 large footpath section and the outer peripheral face of push rod 16 are conflicted.On gag lever post 13, the second Compress Spring 12 of suit is in compressive state, and on described push rod 16, the first Compress Spring 8 of suit is in compressive state.
When after Steam Turbine Over-speed Accident, flyball B centrifugal force increases, the first impact head 1 will be got to, first impact head 1 promotes push rod 16 and moves away from the direction of flyball, the first Compress Spring 8 on push rod 16 is compressed, and block to the limited bar 13 of the annular groove 161 on push rod 16, push rod 16 axial displacement this moment reaches maximum value, the second impact head 2 that push rod 16 connects will trigger pneumatic valve events as signal source, thus reach the object of speed limit.Twist portable head, gag lever post 13 is made to increase under the effect of the second Compress Spring 12 simultaneously on gag lever post, make the top of gag lever post 13 depart from locating slot 161 on push rod, return under the effect of the first Compress Spring 8 that push rod 16 is sheathed thereon flyball knock before position.
Claims (6)
1. the overspeed preventer of a steam turbine, it is characterized in that: comprise push rod (16) and end body (6), one end of described push rod (16) arranges the first impact head (1), and the other end arranges the second impact head (2); In a tubular form, it is enclosed within described push rod (16) described end body (6); Described end body (6) arranges end cap I (4) near the end of the first impact head (1) and seals, and described end body (6) arranges end cap II (14) near the end of the second impact head (2) and seals; Described push rod (16) runs through described end cap I (4), end cap II (14), and respectively with end cap I (4), end cap II (14) matched in clearance; The endoporus of described end body (6) is notch cuttype, its large footpath section is adjacent with end cap II (14), described push rod (16) is provided with a limited step (162), this limited step (162) is positioned at the large footpath section of end body (6) endoporus, and be limited in the hole shoulder of end body (6) endoporus, the first Compress Spring (8) is provided with between this limited step and end cap II (14), this first Compress Spring (8) is enclosed within described push rod (16), under normal condition, this first Compress Spring (8) is in compressive state;
Described end cap II (14) is disposed radially the installing hole (131) installing described gag lever post (13), the aperture of described installing hole (131) arranges an end cap III (10) and seals, and described gag lever post (13) part is positioned at described installing hole (131); The outer peripheral face of described gag lever post (13) is notch cuttype, the path section of gag lever post (13) is through end cap III (10) and end cap III (10) matched in clearance, the large footpath section of gag lever post (13) and the hole wall matched in clearance of installing hole (131), sheathed second Compress Spring (12) in the path section of described gag lever post (13), the two ends of the second Compress Spring (12) are limited in the shaft shoulder of end cap III (10), gag lever post (13); The end thread of the path section of described gag lever post (13) connects portable head (9);
Described push rod (16) outer peripheral face is arranged a locating slot (161); When not exceeding the speed limit, the end of described gag lever post (13) large footpath section and the outer peripheral face of described push rod (16) are conflicted; During hypervelocity, described gag lever post (13) moves axially along end body (6) to the direction of the second impact head (2), and the locating slot (161) that the end to described gag lever post (13) large footpath section embeds on described push rod (16) is interior to push rod (16) axial limiting.
2. overspeed preventer according to claim 1, it is characterized in that: described end cap II (14) near the end face part of described end body (6) to extend in the large footpath section of described end body (6) endoporus and with the hole wall matched in clearance of this large footpath section, for radial spacing to end cap II (14), and the limited step (162) on the end face of this extension of end cap II (14) and described push rod (16) leaves distance.
3. overspeed preventer according to claim 1, it is characterized in that: described end body (6) is provided with thrust ball bearing (5) in the endoporus of described first impact head (1), and described push rod (16) is through this thrust ball bearing (5).
4. overspeed preventer according to claim 1, it is characterized in that: described first impact head (1), the second impact head (2) are threaded in the two ends of described push rod (16), and described first impact head (1), the second impact head (2) are connected by holding screw (3) with described push rod (16) in the direction perpendicular to described push rod (16).
5. overspeed preventer according to claim 1, is characterized in that: described end cap I (4) is connected with described end body (6) by bolt.
6. overspeed preventer according to claim 1, it is characterized in that: described end cap II (14) protrudes to the direction away from end body (6) away from the end face of described end body (6), the endoporus of this convex section is provided with cylinder sleeve (15), and described cylinder sleeve (15) is enclosed within the upper also matched in clearance of described push rod (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520517664.5U CN205078290U (en) | 2015-07-16 | 2015-07-16 | Steam turbine prevent device that exceeds speed limit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520517664.5U CN205078290U (en) | 2015-07-16 | 2015-07-16 | Steam turbine prevent device that exceeds speed limit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205078290U true CN205078290U (en) | 2016-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520517664.5U Active CN205078290U (en) | 2015-07-16 | 2015-07-16 | Steam turbine prevent device that exceeds speed limit |
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| CN (1) | CN205078290U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111441832A (en) * | 2020-03-30 | 2020-07-24 | 大唐东北电力试验研究院有限公司 | Mechanical overspeed test method suitable for double-flyweight steam turbine |
-
2015
- 2015-07-16 CN CN201520517664.5U patent/CN205078290U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111441832A (en) * | 2020-03-30 | 2020-07-24 | 大唐东北电力试验研究院有限公司 | Mechanical overspeed test method suitable for double-flyweight steam turbine |
| CN111441832B (en) * | 2020-03-30 | 2022-06-14 | 大唐东北电力试验研究院有限公司 | Mechanical overspeed test method suitable for double-flyweight steam turbine |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |