CN210087397U - Shaft seal steam supply system capable of effectively improving shaft seal sealing performance of low-pressure cylinder of steam turbine - Google Patents
Shaft seal steam supply system capable of effectively improving shaft seal sealing performance of low-pressure cylinder of steam turbine Download PDFInfo
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- CN210087397U CN210087397U CN201920276886.0U CN201920276886U CN210087397U CN 210087397 U CN210087397 U CN 210087397U CN 201920276886 U CN201920276886 U CN 201920276886U CN 210087397 U CN210087397 U CN 210087397U
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- steam supply
- seal body
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Abstract
The utility model relates to a shaft seal steam supply system for effectively improving the sealing performance of a shaft seal of a low-pressure cylinder of a steam turbine, which comprises a steam supply system, a shaft seal body and a steam exhaust system, wherein the steam supply system and the steam exhaust system are both connected with the shaft seal body; the steam supply system comprises a steam supply branch and a steam supply branch, the steam supply branch is connected with the first X cavity of the shaft seal body, the steam supply branch is connected with the lower half X cavity of the shaft seal body, a valve is installed on the steam supply branch, and a steam exhaust system is connected with the lower half Y cavity of the shaft seal body. The utility model discloses increase on supplying the vapour system and supply the vapour branch road all the way, connect to the upper end of the shaft seal body, and all install the valve additional on two way branches, through adjusting valve's aperture, can control the steam admission volume of upper and lower two shaft seal bodies respectively, make its interior steam volume be in reasonable within range.
Description
Technical Field
The utility model relates to an effectively improve bearing seal steam supply system of steam turbine low pressure cylinder shaft seal sealing performance.
Background
The working principle of the steam turbine shaft seal system is as follows: when the unit normally operates, shaft seal leakage steam of the high and medium pressure cylinders leaks into the shaft seal steam supply main pipe, one part of the shaft seal leakage steam flows into the low pressure cylinder shaft seal system, the leakage of the shaft seal position of the low pressure cylinder into vacuum is prevented, and redundant steam flows into the condenser through the overflow valve.
In the low-pressure cylinder shaft seal steam supply system adopted at present, a low-pressure cylinder shaft seal air supply pipe is connected to the bottom of an X chamber, an annular chamber is filled under the driving of pressure, after the pressure is reduced through a shaft seal tooth, one part of the gas flows into a low-pressure cylinder, and the other part of the gas flows into a Y chamber and then is led into a shaft seal heater.
The size of the steam supply pressure of the shaft seal, or the steam quantity in the X chamber determines the quality of the shaft seal effect, if the shaft seal pressure is larger and the steam quantity is too large, the excessive steam quantity can continuously leak into the bearing through the shaft seal teeth after passing through the Y chamber, and the oil quality is influenced; the sealing effect is influenced by too little steam, and the vacuum of the unit is influenced by sucking external air into the cylinder. Therefore, in order to ensure good sealing effect of the shaft seal, the steam quantity in the X chamber needs to be ensured within a reasonable range.
The low-pressure cylinder shaft seal body structure comprises an upper half body and a lower half body which are arranged on the main shaft, and is influenced by the installation process, the product quality, the long-term operation of a unit and the like, the gap between the two half shaft seal bodies and the main shaft can be changed, and the conditions that steam leaks out due to excessive steam in the lower shaft seal body and vacuum is influenced due to insufficient steam in the upper shaft seal body can occur.
A conventional low pressure cylinder gland seal steam supply system is shown in fig. 1.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design reasonable, effectively improve the bearing seal steam supply system of steam turbine low cylinder shaft seal sealing performance.
The utility model provides a technical scheme that above-mentioned problem adopted is: a shaft seal steam supply system for effectively improving the sealing performance of a shaft seal of a low-pressure cylinder of a steam turbine comprises a steam supply system, a shaft seal body and a steam exhaust system, wherein the steam supply system and the steam exhaust system are connected with the shaft seal body; its characterized in that, supply vapour system including a confession vapour branch road and No. two confession vapour branch roads, a confession vapour branch road is connected with the first X cavity of shaft seal body, No. two confession vapour branch roads are connected with the lower half X cavity of shaft seal body, install a valve on the vapour branch road of a confession, install No. two valves on the vapour branch road of No. two confession, steam exhaust system is connected with the lower half Y cavity of shaft seal body.
Further, the first valve and the second valve are both manual valves.
Compared with the prior art, the utility model, have following advantage and effect: the utility model discloses increase on supplying the vapour system and supply the vapour branch road all the way, connect to the upper end of the shaft seal body, and all install the valve additional on two way branches, through adjusting valve's aperture, can control the steam admission volume of upper and lower two shaft seal bodies respectively, make its interior steam volume be in reasonable within range. Along with the increase of unit operation age, even upper and lower shaft seal body and main shaft clearance take place great change, through the adjusting valve, still can make its inside steam realize better sealed effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic view of a conventional low-pressure cylinder shaft seal steam supply system of the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
In the figure: steam supply system 1, a steam supply branch 2, a steam supply branch 3, a valve 4, a valve 5, a shaft seal body 6, an X chamber 7, a Y chamber 8 and a steam exhaust system 9.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 2, the shaft seal steam supply system for effectively improving the sealing performance of the shaft seal of the low-pressure cylinder of the steam turbine in the embodiment includes a steam supply system 1, a shaft seal body 6 and a steam exhaust system 9, and the steam supply system 1 and the steam exhaust system 9 are connected with the shaft seal body 6; steam supply system 1 includes that a steam supply branch road 2 and No. two steam supply branch roads 3, a steam supply branch road 2 is connected with first half X cavity 7 of shaft seal body 6, No. two steam supply branch roads 3 are connected with lower half X cavity 7 of shaft seal body 6, install valve 4 No. one on the steam supply branch road 2, install valve 5 No. two on No. two steam supply branch roads 3, valve 4 and valve 5 No. two are manual valve, steam exhaust system 9 is connected with lower half Y cavity 8 of shaft seal body 6.
And will be apparent to those skilled in the art from the foregoing description.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (2)
1. A shaft seal steam supply system for effectively improving the sealing performance of a shaft seal of a low-pressure cylinder of a steam turbine comprises a steam supply system (1), a shaft seal body (6) and a steam exhaust system (9), wherein the steam supply system (1) and the steam exhaust system (9) are connected with the shaft seal body (6); its characterized in that, supply vapour system (1) including supplying vapour branch road (2) and No. two steam supply branch roads (3), supply vapour branch road (2) to be connected with first X cavity (7) of shaft seal body (6) for one number, No. two steam supply branch roads (3) are connected with lower half X cavity (7) of shaft seal body (6), supply to install valve (4) on vapour branch road (2) for one number, install No. two valve (5) on two steam supply branch roads (3), steam exhaust system (9) are connected with lower half Y cavity (8) of shaft seal body (6).
2. The shaft seal steam supply system for effectively improving the shaft seal sealing performance of the low-pressure cylinder of the steam turbine according to claim 1, wherein the first valve (4) and the second valve (5) are both manual valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920276886.0U CN210087397U (en) | 2019-03-05 | 2019-03-05 | Shaft seal steam supply system capable of effectively improving shaft seal sealing performance of low-pressure cylinder of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920276886.0U CN210087397U (en) | 2019-03-05 | 2019-03-05 | Shaft seal steam supply system capable of effectively improving shaft seal sealing performance of low-pressure cylinder of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210087397U true CN210087397U (en) | 2020-02-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920276886.0U Active CN210087397U (en) | 2019-03-05 | 2019-03-05 | Shaft seal steam supply system capable of effectively improving shaft seal sealing performance of low-pressure cylinder of steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210087397U (en) |
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2019
- 2019-03-05 CN CN201920276886.0U patent/CN210087397U/en active Active
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