CN203686347U - Connecting structure of crosshead of high-pressure adjustment valve of power plant host - Google Patents
Connecting structure of crosshead of high-pressure adjustment valve of power plant host Download PDFInfo
- Publication number
- CN203686347U CN203686347U CN201320869670.8U CN201320869670U CN203686347U CN 203686347 U CN203686347 U CN 203686347U CN 201320869670 U CN201320869670 U CN 201320869670U CN 203686347 U CN203686347 U CN 203686347U
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- CN
- China
- Prior art keywords
- crosshead
- cylindrical hole
- valve rod
- lifting nut
- square groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000001066 destructive effect Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
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- Lift Valve (AREA)
Abstract
The utility model discloses a connecting structure of a crosshead of a high-pressure adjustment valve of a power plant host. A cylindrical hole is formed in the crosshead; a lifting nut is arranged in the cylindrical hole; a valve rod is inserted into the lifting nut and is in threaded fit and connection with the lifting nut; a backing ring is arranged between the top end of the valve rod and the bottom of the cylindrical hole; a screw plug is screwed into the cylindrical hole; the top of the screw plug is in compression connection with the lifting nut; the bottom of the screw plug is flush with the outer end face of the cylindrical hole; a guide pin is arranged along a side wall of the crosshead and is perpendicular to the lifting nut; and the top end of the guide pin compresses a side wall of the lifting nut.The connecting structure has the advantages that the lifting nut is additionally arranged between the crosshead and the valve rod, and the guide pin fixes the lifting nut, so that even the guide pin is broken, threads in the lifting nut cannot be damaged, the dismounting and maintenance are facilitated, the crosshead, the lifting nut and the valve rod are not required to be subjected to destructive treatment, and the maintenance cost is lowered.
Description
Technical field
The utility model relates to a kind of crosshead connecting structure, particularly relates to a kind of power plant main frame high-pressure regulation porthole crosshead connecting structure.
Background technique
Turbine high-pressure main stop valve is positioned on the main steam line before turbine governor valve, each high pressure main stop valve has a steam inlet and one to be connected to the steam ouput of modulating valve chamber, high pressure main stop valve does not generally participate in regulating, thereby four high-pressure regulation portholes are controlled steam turbine throttle flow by oil engine control aperture thereafter.Oil engine bar is connected with regulating porthole crosshead by valve rod, and crosshead penetrates anti-rotation pin with high-pressure regulation porthole valve rod by the rear brill pin hole that has been threaded.
In major overhaul process, find that regulating valve stem and crosshead catch pin fracture thread biting locking, valve rod exit thread damage and cannot dismantle.Make crosshead and valve rod do destructive processing, cause very large economic loss.Pitch valve rod in service and crosshead thread damage cause stem dropping, and the sub-load of the pitch that comes off unit band out of hand, pitch fit badly and have hypervelocity hidden danger, greatly reduce unit economy and Security.
Model utility content
The purpose of this utility model is to provide power plant's main frame high-pressure regulation porthole crosshead connecting structure.
The purpose of this utility model is implemented by following technological scheme, a kind of power plant main frame high-pressure regulation porthole crosshead connecting structure, in crosshead, offer cylindrical hole, in described cylindrical hole, be provided with hoisting nut, valve rod inserts in described hoisting nut and is connected with described hoisting nut screw-thread fit, between the top of described valve rod and the bottom of described cylindrical hole, be provided with gasket ring, plug screw screws in described cylindrical hole, described plug screw top compresses and is connected with described hoisting nut, described plug screw bottom is concordant with described cylindrical hole exterior edge face, sidewall along described crosshead is provided with guide finger, described guide finger is vertical with described hoisting nut, the top of described guide finger compresses the sidewall of described hoisting nut, described cylindrical hole is provided with keep plate outward, in described keep plate, have the square groove matching with the square wrenching bar of described valve rod, described square groove is plugged on described square wrenching bar, the upper-end surface of described keep plate and the end face of described crosshead are welded to connect.
A side relative with described square groove is provided with the square groove hush panel matching with described square groove, and described square groove hush panel and described keep plate are welded to connect.Valve rod is blocked at keep plate four sides, and can produce a very large enclasping force to valve rod because postwelding weld seam shrinks, and prevents that valve rod from occurring loosening, avoids keep plate to come off.
The utility model has the advantage of, (1) between crosshead and valve rod, add hoisting nut, guide finger is fixed hoisting nut, even guide finger fracture, can not destroy hoisting nut internal whorl yet, be easy to remove and repair, needn't do destructive processing to crosshead, hoisting nut and valve rod, reduce maintenance cost; (2) valve rod is blocked at keep plate four sides, and can produce a very large enclasping force to valve rod because postwelding weld seam shrinks, and prevents that valve rod from occurring loosening, avoids keep plate to come off, and guarantees unit safety stable operation.
Accompanying drawing explanation
Fig. 1 is a kind of power plant main frame high-pressure regulation porthole crosshead connecting structure sectional drawing.
Fig. 2 is the A-A sectional view of Fig. 1.
Crosshead 1, cylindrical hole 2, hoisting nut 3, valve rod 4, gasket ring 5, plug screw 6, guide finger 7, keep plate 8, square wrenching bar 9, square groove 10, square groove hush panel 11.
Embodiment: a kind of power plant main frame high-pressure regulation porthole crosshead connecting structure, in crosshead 1, offer cylindrical hole 2, in cylindrical hole 2, be provided with hoisting nut 3, valve rod 4 inserts in hoisting nut 3 and is connected with hoisting nut 3 screw-thread fit, between the bottom of the top of valve rod 4 and cylindrical hole 2, be provided with gasket ring 5, plug screw 6 screws in cylindrical hole 2, plug screw 6 tops compress and are connected with hoisting nut 3, plug screw 6 bottoms are concordant with cylindrical hole 2 exterior edge faces, be provided with guide finger 7 along the sidewall of crosshead 1, guide finger 7 is vertical with hoisting nut 3, the top of guide finger 7 compresses the sidewall of hoisting nut 3, the outer keep plate 8 that is provided with of cylindrical hole 2, in keep plate 8, have the square groove 10 matching with the square wrenching bar 9 of valve rod 4, square groove 10 is plugged on square wrenching bar 9, the end face of the upper-end surface of keep plate 8 and crosshead 1 is welded to connect.A side relative with square groove 10 is provided with the square groove hush panel 11 matching with square groove 10, and square groove hush panel 11 is welded to connect with keep plate 8.
Claims (2)
1. power plant's main frame high-pressure regulation porthole crosshead connecting structure, it is characterized in that, in crosshead, offer cylindrical hole, in described cylindrical hole, be provided with hoisting nut, valve rod inserts in described hoisting nut and is connected with described hoisting nut screw-thread fit, between the top of described valve rod and the bottom of described cylindrical hole, be provided with gasket ring, plug screw screws in described cylindrical hole, described plug screw top compresses and is connected with described hoisting nut, described plug screw bottom is concordant with described cylindrical hole exterior edge face, sidewall along described crosshead is provided with guide finger, described guide finger is vertical with described hoisting nut, the top of described guide finger compresses the sidewall of described hoisting nut, described cylindrical hole is provided with keep plate outward, in described keep plate, have the square groove matching with the square wrenching bar of described valve rod, described square groove is plugged on described square wrenching bar, the upper-end surface of described keep plate and the end face of described crosshead are welded to connect.
2. a kind of power plant according to claim 1 main frame high-pressure regulation porthole crosshead connecting structure, it is characterized in that, a side relative with described square groove is provided with the square groove hush panel matching with described square groove, and described square groove hush panel and described keep plate are welded to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320869670.8U CN203686347U (en) | 2013-12-27 | 2013-12-27 | Connecting structure of crosshead of high-pressure adjustment valve of power plant host |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320869670.8U CN203686347U (en) | 2013-12-27 | 2013-12-27 | Connecting structure of crosshead of high-pressure adjustment valve of power plant host |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203686347U true CN203686347U (en) | 2014-07-02 |
Family
ID=51008246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320869670.8U Expired - Lifetime CN203686347U (en) | 2013-12-27 | 2013-12-27 | Connecting structure of crosshead of high-pressure adjustment valve of power plant host |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203686347U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106471300A (en) * | 2014-12-25 | 2017-03-01 | 株式会社富士金 | Fluid control |
| CN107061862A (en) * | 2017-06-01 | 2017-08-18 | 东方电气集团东方汽轮机有限公司 | A kind of valve crosshead connecting structure |
-
2013
- 2013-12-27 CN CN201320869670.8U patent/CN203686347U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106471300A (en) * | 2014-12-25 | 2017-03-01 | 株式会社富士金 | Fluid control |
| CN106471300B (en) * | 2014-12-25 | 2019-07-12 | 株式会社富士金 | Fluid control |
| CN107061862A (en) * | 2017-06-01 | 2017-08-18 | 东方电气集团东方汽轮机有限公司 | A kind of valve crosshead connecting structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |
|
| CX01 | Expiry of patent term |