CN216158289U - Generator differential pressure valve sealing oil system - Google Patents
Generator differential pressure valve sealing oil system Download PDFInfo
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- CN216158289U CN216158289U CN202122283622.8U CN202122283622U CN216158289U CN 216158289 U CN216158289 U CN 216158289U CN 202122283622 U CN202122283622 U CN 202122283622U CN 216158289 U CN216158289 U CN 216158289U
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Abstract
The utility model relates to a generator differential pressure valve sealing oil system, which comprises a double-flow ring type sealing tile arranged around a generator rotating shaft; the double-flow ring type sealing bush is provided with two groups of circulating oil supply systems, one group is a hydrogen side sealing oil circuit, and the other group is an air side sealing oil circuit; the air side sealing oil circuit is characterized in that an air side oil pump obtains an oil source from an oil tank, one part of the oil source flows into an air side sealing oil inlet, and the other part of the oil source flows back to the air side oil pump through a differential pressure valve; and the differential pressure valve is respectively additionally provided with an exhaust pipe, a needle valve and a plug on a signal pipe connected with the generator and an upper cavity and a lower cavity connected with the hollow side sealing oil outlet. The utility model can discharge compressible gas in the signal pipes communicated with the upper and lower chambers of the main differential valve in time, and can ensure the safety during the exhaust, so that the main differential valve can be quickly recovered to be normal, and the phenomenon that the safe operation of the generator set is influenced due to the abnormal operation of the hydrogen sealing oil system of the generator caused by the abnormal operation of the main differential valve is prevented.
Description
Technical Field
The utility model relates to a generator differential pressure valve sealing oil system.
Background
In order to ensure the reliable and stable operation (reliable sealing effect) of the shaft seal of the generator, it is necessary to ensure that the sealing oil pressure on the hollow side of the hydrogen sealing oil system of the generator is always higher than the hydrogen pressure in the generator by a certain specified value and keeps constant, and the oil pressure on the hydrogen side and the oil pressure on the hollow side in the sealing ring are kept equal, and the pressure difference is limited within the allowable variation range, so that it is necessary to ensure that the sealing oil pressure on the hollow side is stabilized within the allowable variation range, and the sealing oil pressure on the hollow side is automatically controlled by the main differential pressure valve (the standby differential pressure valve is automatically put into operation under the abnormal operation of the main differential pressure valve to keep the hydrogen differential pressure at a certain specified value).
However, the opening of the main differential pressure valve is easily affected by compressible gas stored in upper and lower chambers of the bellows to generate fluctuation, even the main differential pressure valve cannot work normally in severe cases, the air side sealing oil pressure also fluctuates, even the sealing oil system cannot work normally in severe cases, once the air side sealing oil pressure fluctuates too much or works abnormally, hydrogen in the generator leaks outwards, and the safe operation of the generator set is seriously affected.
In order to prevent the abnormal situation, a method adopted in the past is to open a quick oil discharge valve at the bottom of a generator defoaming box to perform exhaust treatment, but the valve is far away from a main differential pressure valve and cannot discharge compressible gas existing in an upper chamber of the main differential pressure valve and a signal pipe connected with the upper chamber, and the quick oil discharge valve at the bottom of the defoaming box is only communicated with the upper chamber of the main differential pressure valve and cannot discharge the compressible gas existing in a lower chamber of the main differential pressure valve and the signal pipe connected with the lower chamber of the main differential pressure valve, so that the effect is almost not achieved in practical use. The second method is to remove the pipe plugs on the upper and lower chambers of the main differential pressure valve to exhaust, but the pipe plugs can not be controlled in practice, and the safe operation of the hydrogen sealing oil system of the generator is seriously influenced by the falling of the pipe plugs.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems and provide a generator differential pressure valve sealing oil system which can timely discharge compressible gas in a signal pipe communicated with an upper chamber and a lower chamber of a main differential valve by arranging a needle valve and can ensure safety during gas discharge.
In order to achieve the purpose, the utility model is realized by the following technical scheme: a generator differential pressure valve sealing oil system comprises a double-flow ring type sealing tile arranged around a generator rotating shaft; the double-flow ring type sealing bush is provided with two groups of circulating oil supply systems, one group is a hydrogen side sealing oil circuit, and the other group is an air side sealing oil circuit; an air side sealing oil inlet and an air side sealing oil outlet and a hydrogen side sealing oil inlet and an air side sealing oil outlet are arranged in the double-flow ring type sealing tile; the air side sealing oil circuit is characterized in that an air side oil pump obtains an oil source from an oil tank, one part of the oil source flows into an air side sealing oil inlet, and the other part of the oil source flows back to the air side oil pump through a differential pressure valve; the hydrogen side sealing oil circuit is characterized in that an oil source is obtained from an oil tank by a hydrogen side oil pump, one part of the oil source flows into a hydrogen side sealing oil inlet through a balance valve, and a needle valve and a plug are respectively additionally arranged on a signal pipe connected with an upper cavity and a lower cavity of the differential pressure valve, wherein the signal pipe is respectively connected with a generator and a hollow side sealing oil outlet.
Furthermore, the balance valve is arranged at the outlet of the hydrogen side oil pump, signals of the balance valve are respectively obtained from the oil pressure of the hydrogen side sealing oil outlet and the oil pressure of the air side sealing oil outlet in the double-flow ring type sealing bush, and the opening size of the balance valve is automatically adjusted through the change of the oil pressure of the hydrogen side sealing oil outlet and the oil pressure of the air side sealing oil outlet, so that the balance of the oil pressure of the air side sealing oil path and the oil pressure of the hydrogen side sealing oil path is realized.
In particular, the differential pressure valve is connected to the outlet of the air side oil pump, signals of the differential pressure valve are respectively obtained from gas pressure in the generator and oil pressure of the air side sealing oil outlet, and the differential pressure valve automatically adjusts the flow rate of the hydrogen side sealing oil inlet, so that balance between the air side sealing oil path and the generator gas pressure is realized.
Further, oil supplied by the hydrogen side sealing oil path flows to a hydrogen side sealing oil outlet along a gap between a rotating shaft of the generator and the double-flow ring type sealing bush and flows into the defoaming box; the oil supplied by the empty side sealing oil path flows to the bearing side along the gap between the rotating shaft of the generator and the double-flow ring type sealing bush, and is collected with the bearing return oil to enter the sealing oil empty side oil return tank together, so that the air and the moisture are prevented from entering the generator; in the sealing oil system, oil returns to the double-flow ring type sealing bush after being subjected to capacity expansion and gas release, cooling and filtering to form a circulating oil supply system.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model is characterized in that an exhaust pipe (with the specification of phi 10), a needle valve (with the specification of J61Y-320P DN 5) and a plug (with the specification of phi 1/8) are respectively arranged on signal pipes connected with the upper and lower chambers of a main differential pressure valve, wherein the plug is used for preventing the occurrence of abnormal operation accidents of a hydrogen sealing oil system of a generator caused by internal leakage of the needle valve or mistakenly opening of the needle valve by a person. When the main differential pressure valve is found to have compressible gas to cause work abnormality because of upper and lower cavities or in the signal pipe connected with the main differential pressure valve, the plug on the needle valve can be removed in time, the newly-increased needle valve on the main differential pressure valve signal pipe is opened slowly respectively, the compressible gas in the signal pipe communicated with the upper and lower cavities of the main differential pressure valve can be discharged in time, the safety during exhaust can be ensured, the main differential pressure valve is recovered to be normal, and the safe operation of the generator set is prevented from being influenced because the work abnormality of the main differential pressure valve causes the work abnormality of the hydrogen sealing oil system of the generator.
Drawings
FIG. 1 is a schematic diagram of a generator differential pressure valve seal oil system of the present invention.
Detailed Description
The utility model will be further described in detail with reference to examples of embodiments shown in the drawings to which, however, the utility model is not restricted.
The utility model aims to solve the problem that the opening degree of a main differential pressure valve is easy to fluctuate under the influence of compressible gas stored in an upper chamber and a lower chamber of a corrugated pipe; referring to fig. 1, the main parts are as follows (wherein the dotted part is taken as information):
a generator differential pressure valve sealing oil system comprises a double-flow ring type sealing tile 1 arranged around a generator rotating shaft 0; the double-flow ring type sealing bush 1 is provided with two groups of circulating oil supply systems, one group is a hydrogen side sealing oil circuit, and the other group is an air side sealing oil circuit; the double-flow ring type sealing tile is internally provided with an air side sealing oil inlet and an air side sealing oil outlet and a hydrogen side sealing oil inlet and an air side sealing oil outlet; the air side sealing oil circuit is characterized in that an air side oil pump obtains an oil source from an oil tank, one part of the oil source flows into an air side sealing oil inlet 1-1, and the other part of the oil source flows back to the air side oil pump through a differential pressure valve 2; the pressure difference valve 2 is connected with the outlet of the air side oil pump, signals of the pressure difference valve are respectively taken from the gas pressure in the generator and the oil pressure of the air side sealing oil outlet 1-4, and the flow of the hydrogen side sealing oil flowing into the inlet is automatically adjusted through the pressure difference valve 2, so that the balance of the air side sealing oil circuit and the generator gas pressure is realized.
The hydrogen side sealing oil path is an oil source obtained by a hydrogen side oil pump from an oil tank, one part of the hydrogen side sealing oil path flows into a hydrogen side sealing oil inlet 1-2 through a balance valve 3, the balance valve 3 is arranged at the outlet of the hydrogen side oil pump, signals of the hydrogen side sealing oil path are respectively obtained from the oil pressure of a hydrogen side sealing oil outlet 1-3 and the oil pressure of an air side sealing oil outlet 1-4 in a double-flow ring type sealing tile 1, and the opening size of the balance valve 3 is automatically adjusted through the change of the oil pressure of the hydrogen side sealing oil outlet 1-3 and the oil pressure of the air side sealing oil outlet 1-4, so that the balance of the oil pressure of the air side sealing oil path and the oil pressure of the hydrogen side sealing oil path is realized. Oil supplied by the hydrogen side sealing oil circuit flows to a hydrogen side sealing oil outlet 1-3 along a gap between the generator rotating shaft 0 and the double-flow ring type sealing tile 1 and flows into a defoaming box; the oil supplied by the empty side sealing oil path flows to the bearing side along the gap between the rotating shaft 0 of the generator and the double-flow ring type sealing bush 1 and is collected with the bearing return oil to enter the sealing oil empty side oil return tank together, so that the air and the moisture are prevented from entering the generator; in the sealing oil system, oil returns to the double-flow ring type sealing bush after being subjected to capacity expansion and gas release, cooling and filtering to form a circulating oil supply system.
Because the bellows upper portion cavity of differential pressure valve 2 communicates with hydrogen in the generator through the signal pipe, and the signal is taken from the hydrogen pressure (through the transmission of oil pressure form) in the generator, and the lower portion cavity communicates with the sealed oil feed unit of dead side through the signal pipe, and the signal is taken from the sealed oil pressure of dead side, because gas pressure signal and sealed oil pressure signal act in opposite direction, so when pressure is unbalanced, the valve rod moves up or moves down. The structure of the main differential pressure valve core can further close the valve when the valve rod moves downwards (the flow passing through the main differential pressure valve is reduced when the gas pressure rises or the sealing oil pressure drops); since the outlet flow rate of the screw pump used in the air side seal oil supply device is almost constant, the air side flow rate flowing to the seal ring is increased, and the seal oil pressure at the shaft seal is increased. On the contrary, when the valve core of the main differential pressure valve moves upwards, the flow rate flowing to the sealing ring is reduced, and the pressure of the sealing oil is reduced. The automatic adjustment of the opening of the main differential pressure valve ensures that the differential pressure between the hydrogen pressure in the machine and the oil pressure of the air side seal is maintained to be operated within the range of 0.084MPa (when the standby differential pressure valve works, the differential pressure between the hydrogen pressure in the machine and the oil pressure of the air side seal can be maintained to be operated within the range of 0.056 MPa), but the opening of the main differential pressure valve is easy to be influenced by the compressible gas stored in the upper chamber and the lower chamber of the corrugated pipe to generate fluctuation in the operation process, and even can not work normally in serious cases, this will cause the oil pressure of the air side seal to fluctuate, even cause the seal oil system to fail to operate normally in severe cases, once the oil pressure of the air side seal fluctuates too much or works abnormally, hydrogen in the generator will leak outwards, which will seriously affect the safe operation of the generator set, therefore, in order to solve the problems, the utility model is additionally provided with a needle valve 4 and a plug 5 on a signal pipe which is connected with an upper chamber and a lower chamber of a differential pressure valve 2 which are respectively connected with a generator and an air side sealing oil outlet 1-4.
The device comprises an additional exhaust pipe (with the specification of phi 10), a needle valve (with the specification of J61Y-320P DN 5) and a plug (with the specification of phi 1/8), wherein the plug is used for preventing the needle valve from leaking or preventing the needle valve from being opened by mistake to cause the abnormal operation accident of the hydrogen sealing oil system of the generator. When the main differential pressure valve is found to have compressible gas to cause work abnormality because of upper and lower cavities or in the signal pipe connected with the main differential pressure valve, the plug on the needle valve can be removed in time, the newly-increased needle valve on the main differential pressure valve signal pipe is opened slowly respectively, the compressible gas in the signal pipe communicated with the upper and lower cavities of the main differential pressure valve can be discharged in time, the safety during exhaust can be ensured, the main differential pressure valve is recovered to be normal, and the safe operation of the generator set is prevented from being influenced because the work abnormality of the main differential pressure valve causes the work abnormality of the hydrogen sealing oil system of the generator.
The above-mentioned embodiments are only for convenience of description, and are not intended to limit the present invention in any way, and those skilled in the art will understand that the technical features of the present invention can be modified or changed by other equivalent embodiments without departing from the scope of the present invention.
Claims (4)
1. The utility model provides a generator differential pressure valve sealing oil system which characterized in that: the double-flow ring type sealing bush is arranged around a rotating shaft of the generator; the double-flow ring type sealing bush is provided with two groups of circulating oil supply systems, one group is a hydrogen side sealing oil circuit, and the other group is an air side sealing oil circuit; an air side sealing oil inlet and an air side sealing oil outlet and a hydrogen side sealing oil inlet and an air side sealing oil outlet are arranged in the double-flow ring type sealing tile; the air side sealing oil circuit is characterized in that an air side oil pump obtains an oil source from an oil tank, one part of the oil source flows into an air side sealing oil inlet, and the other part of the oil source flows back to the air side oil pump through a differential pressure valve; the hydrogen side sealing oil path is formed by taking an oil source from an oil tank by a hydrogen side oil pump, and a part of the oil source flows into a hydrogen side sealing oil inlet through a balance valve; and the differential pressure valve is respectively additionally provided with an exhaust pipe, a needle valve and a plug on a signal pipe connected with the generator and an upper cavity and a lower cavity connected with the hollow side sealing oil outlet.
2. A generator differential pressure valve seal oil system as defined in claim 1, wherein: the balance valve is arranged at the outlet of the hydrogen side oil pump, signals of the balance valve are respectively taken from the oil pressure of the hydrogen side sealing oil outlet and the oil pressure of the air side sealing oil outlet in the double-flow ring type sealing tile, and the opening size of the balance valve is automatically adjusted through the change of the oil pressure of the hydrogen side sealing oil outlet and the oil pressure of the air side sealing oil outlet, so that the balance of the oil pressure of the air side sealing oil path and the oil pressure of the hydrogen side sealing oil path is realized.
3. A generator differential pressure valve seal oil system according to claim 2, wherein: the pressure difference valve is connected with the outlet of the air side oil pump, signals of the pressure difference valve are respectively obtained from gas pressure in the generator and oil pressure of the outlet of the air side sealing oil, and the flow of the hydrogen side sealing oil flowing into the inlet of the hydrogen side sealing oil is automatically adjusted through the pressure difference valve, so that the balance of the air side sealing oil circuit and the gas pressure of the generator is realized.
4. A generator differential pressure valve seal oil system according to claim 3, wherein: the oil supplied by the hydrogen side sealing oil path flows to the hydrogen side sealing oil outlet along the gap between the rotating shaft of the generator and the double-flow ring type sealing tile and flows into the defoaming box; the oil supplied by the empty side sealing oil path flows to the bearing side along the gap between the rotating shaft of the generator and the double-flow ring type sealing bush, and is collected with the bearing return oil to enter the sealing oil empty side oil return tank together, so that the air and the moisture are prevented from entering the generator; in the sealing oil system, oil returns to the double-flow ring type sealing bush after being subjected to capacity expansion and gas release, cooling and filtering to form a circulating oil supply system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122283622.8U CN216158289U (en) | 2021-09-22 | 2021-09-22 | Generator differential pressure valve sealing oil system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122283622.8U CN216158289U (en) | 2021-09-22 | 2021-09-22 | Generator differential pressure valve sealing oil system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216158289U true CN216158289U (en) | 2022-04-01 |
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ID=80852862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122283622.8U Expired - Fee Related CN216158289U (en) | 2021-09-22 | 2021-09-22 | Generator differential pressure valve sealing oil system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216158289U (en) |
-
2021
- 2021-09-22 CN CN202122283622.8U patent/CN216158289U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220401 |