JPS589494Y2 - Sealing oil treatment equipment for rotating electric machines - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a cooling gas sealed oil treatment device for a gas-cooled rotating electric machine.

Conventionally, there has been a device of this type as shown in FIG.

The figure is a schematic system diagram, where 1 is a turbine generator that is cooled by sealing hydrogen scum inside, 2 is a rotating shaft, 3 and 4 are bearings, and 5
, 6 are sealers for preventing the hydrogen gas sealed in the turbine generator 1 from leaking into the atmosphere from the penetration part of the rotating shaft 2, and contain seal rings 5a and 6a therein.

7 is an air-side sealing oil pump for supplying sealing oil into the sealers 5 and 6, and 8 is an emergency sealing oil pump provided for support in the event that the air-side sealing oil pump 7 breaks down. , 9 is a high-pressure oil conduit through which high-pressure oil is supplied from a high-pressure oil supply pump (not shown) on the turbine side as a support oil pressure source, and 10 is a high-pressure oil conduit that receives this high-pressure oil and supplies the necessary oil pressure to the sealers 5 and 6. 11 is an air side seal that supplies necessary pressure oil from the air side seal oil pump 7, the emergency seal oil pump 8, and the replenishment adjustment valve 10 to the sealers 5 and 6. The oil conduit 12 is branched from the seal oil conduit 11 and connected to the air side seal oil pressure in order to prevent the seal float pump edge and seal rings 5a and 6a from being pressed toward the atmosphere by the high gas pressure inside the turbine generator 1. High pressure oil is supplied to the side surface of the seal ring 5a+6a on the atmosphere side to maintain it in a neutral position.

13 is a drain oil conduit in which the air side seal oil and bearing oil are returned together, and 14 is a drain oil conduit in which the drain oil is temporarily retained to remove air and gas from the oil, and then returned to the turbine side. Loop seal tank for sending the necessary amount of air side sealing oil to the processing equipment; 15 is the main drain oil pipe that returns oil to the turbine side; 1
6 is a differential pressure regulating valve for automatically adjusting and supplying the necessary sealing oil pressure (specified differential pressure) to the sealers 5 and 6 by the air-side sealing oil pump 7 or the emergency sealing oil pump 8, 17° 18 is a check valve, and the air side sealing oil pump 7 or the emergency sealing oil pump 8
provision is made to automatically close the respective outlet conduits when the other is in operation.

Reference numeral 19 indicates a relief valve provided in the circuit of the air-side seal oil conduit, and 20 and 21 indicate the air-side seal oil pump 7 and the emergency seal oil pump 8 which are inspected for some reason while the turbine generator 1 is in operation. An oil valve 22 is provided to close the circuit on the side where the seal oil pump is stopped and enable short-time inspection when it becomes necessary to do so. ), 23 is a hydrogen side sealing conduit that guides sealing oil to the hydrogen side side of the sealer 5.6, 24 is a check valve, 25 is a relief valve,
26 is a pressure equalizing valve for supplying the air side sealing oil pressure and the hydrogen side sealing oil pressure equally to the sealers 5 and 6.

27 is a hydrogen side drain oil conduit for returning from the sealers 5 and 6 to the hydrogen side sealed oil pump; 28 is a hydrogen side drain oil conduit for returning the gas pressure in the turbine generator 1 to a constant oil level with two float valves to block the gas; A hydrogen side oil leveling box that supplies only sealing oil to the hydrogen side sealing oil pump 22, 29 is a lubricating oil conduit, and pressure lubricating oil branched from the turbine side lubricating oil pump is sent to the bearings 3,
Lead to 4.

Reference numeral 30 is a differential pressure adjusting section 10 branched from the sealer 5 side of the hydrogen side drain oil conduit 27 in order to automatically operate the replenishment regulating valve 10.
31 is a gas pressure conduit that branches from the sealer 6 side of the hydrogen side drain oil conduit 27 and reaches the differential pressure adjustment part 16a in order to automatically operate the differential pressure adjustment valve 16; 32 is a gas pressure conduit that leads to the differential pressure adjustment part 16a; In order to adjust so that the regulating valve 10 can supply sealing oil that is higher than the gas pressure in the turbine generator 1 by a specified differential pressure to the sealers 5 and 6, it is branched from the air-side sealing oil conduit 11 and is connected to the replenishment regulating valve 10. The hydraulic conduit 33 that leads the hydraulic pressure to the differential pressure adjustment W10a is adjusted so that the differential pressure regulating valve 16 can supply sealing oil higher than the gas pressure in the turbine generator 1 by a specified differential pressure to the sealers 5 and 6. This is a hydraulic conduit that branches from the air-side sealed oil pipe 11 and guides the hydraulic pressure to the differential pressure adjustment part 16a of the differential pressure adjustment valve 16.

Next, the operation will be explained.

In order to prevent the gas sealed in the turbine generator 1 from leaking to the atmosphere, sealing oil is supplied to the sealers 5 and 6 at a specified hydraulic pressure (differential pressure) higher than the gas pressure inside the machine during normal operation. The gas pressure conduit 31 is branched from the hydrogen side sealing oil drainage conduit 27 so that the gas pressure inside the machine is obtained as oil pressure from the piping into which the sealing oil is introduced.

The hydraulic conduit 33 is branched from the air-side seal oil conduit 11, and takes out the pump outlet hydraulic pressure generated when the air-side seal oil pump 7 or the emergency seal oil pump 8 is operated, and takes out the pump outlet hydraulic pressure that is higher than the gas pressure inside the machine. I am getting .

In addition, the differential pressure regulating valve 16 is configured such that the gas pressure and sealing oil pressure are applied to the pressure regulating part 16a, and the valve element is opened and closed to adjust the sealing oil pressure with a predetermined high differential pressure. Prevents cabin gas from leaking.

The air side sealing oil circuit transfers the high pump oil pressure generated by the air side pump 5 or the emergency sealing oil pump 8 to the differential pressure regulating valve 16.
The sealing oil is adjusted to a predetermined value using the air-side sealing oil conduit 11 and is supplied to the air side of the sealer 5.6.

The air side sealing oil discharged from the sealers 5 and 6 is drained from the oil drain pipe 13.
The oil enters the loop seal tank 14 through the air, is vented with air and gas, is discharged, and is returned to the suction side of the air-side seal oil pump 7 or the emergency seal oil pump 8.

In this way, a closed loop is formed in which the cabin gas is sealed and circulated, forming an air-side sealing oil circuit.

In addition, the hydrogen side sealing oil circuit adjusts the high oil pressure generated by the hydrogen side pump 22 to a reduced pressure equal to the air side sealing oil pressure using the pressure equalizing valve 26 and the relief valve 25, and converts this sealing oil into the hydrogen side sealing oil. Hydrogen is supplied to the hydrogen side in the sealers 5 and 6 through a conduit 23, and the gas inside the machine is sealed to prevent leakage.

The hydrogen side sealing oil that has exited the sealer 5.6 is transferred to the hydrogen side drain oil conduit 2.
7, the oil is returned to the suction side of the hydrogen side pump 22 via the oil leveling box 28.

In this way, another closed loop for sealing and circulating the in-machine gas is formed on the inside of the sealer 5.6, forming a hydrogen-side sealing oil circuit in parallel with the air-side sealing oil circuit.

In the event of an accident, if the oil pressure of the air side pump 7 drops due to, for example, a malfunction of the air side pump 7 or the drive motor of this pump stops due to a power outage, the replenishment adjustment valve 10 will close the sealing oil pressure and the in-machine oil pressure. When the pressure difference between the gas pressure and the gas pressure drops to a predetermined value, the valve is automatically opened by the action of the pressure difference adjustment section 10a, and the high pressure oil conduit 7 is opened automatically.
High-pressure oil is supplied from the turbine side, and this support continues the sealing.

Furthermore, if the hydraulic pressure supplied from the turbine side decreases due to a failure of the hydraulic pump (not shown) on the turbine side or the drive motor of this pump stops due to a power outage, the hydraulic pressure will drop to the set value. A switch (not shown) is activated, issues a low oil pressure alarm, and turns on the emergency seal oil pump 8.
Activate the DC automatic starting device.

As a result, the driving DC motor of the seal oil pump 8 is started, and the emergency seal oil pump 8 replaces the air side seal oil pump 7.
supplies air side sealing oil.

In this way, the differential pressure regulating valve 16 and the replenishment regulating valve 10 are automatically operated and various support means are effectively utilized so that the gas in the turbine generator 1 does not leak to the atmosphere at any time. This ensures safe operation of the generator.

Conventional sealed oil treatment equipment has been stolen as described above.
Gas pressure conduit 30 to differential pressure regulating valve 16 and make-up regulating valve 10
．． 31, each branched from the hydrogen side waste oil conduit 27 near the turbine generator 1, and was connected to the sealed oil treatment device in two lines.

The distance from this branch position to the sealed oil treatment equipment is very long, and the work to support it and connect the pipes is troublesome, resulting in high material and construction costs.

Furthermore, the sealing oil and hydraulic pressure in the sealers 5 and 6 are supplied in as small a quantity as possible, and the reduced pump capacity reduces power consumption and improves operating efficiency.

Therefore, if the valve body of the differential pressure adjustment valve 16 or replenishment adjustment valve 10 operates suddenly due to a change in the supply seal oil pressure, the seal oil pressure will also undergo transient fluctuations until the adjustment is stabilized, and this will cause the valve on the operating side to fluctuate. is applied to the differential pressure regulator j6a or 10a, thereby causing transient fluctuations on the gas pressure side of this differential pressure regulator, and this fluctuating gas pressure is passed through the gas pressure conduit 31.30 to the differential pressure of the other valve. When applied to the pressure regulating section, there was a risk of hunting of the regulating valve or malfunction of the other regulating valve.

The differential pressure values between the sealing oil pressure and the in-flight gas pressure, which operate the differential pressure adjustment valve 16, replenishment adjustment valve 10, and the above-mentioned oil pressure switch (not shown), are set to values that are gradually decreased in the order of the above three. This allows for a small pump capacity and good differential pressure.

In conventional devices, in order to deal with the fact that the fluctuating gas pressure on the gas pressure side of the differential pressure adjustment section due to the operation of one regulating valve affects the gas pressure side of the differential pressure adjustment section of the other regulating valve, It is necessary to perform precise adjustment work and set valve characteristics that are not affected by each other, which is troublesome and takes a lot of time.

This idea was made in order to eliminate the above-mentioned drawbacks of the conventional system.The gas pressure conduit from the upper part of the hydrogen side drain oil conduit is led in one line, and two gas pressure conduits are connected at the location of the sealed oil treatment equipment.
branched into the main branch pipe section, connected to the differential pressure adjustment section of the differential pressure adjustment valve and the differential pressure adjustment section of the replenishment adjustment valve, and provided with an accumulator in at least one of these branch pipe sections,
The purpose is to simplify the piping of gas pressure conduits and reduce equipment costs.

FIG. 2 is a system diagram of an apparatus showing an embodiment of this invention, and includes units 1 to 29, 32, 33.5a, and 6a.

10a and 16a are the same as those in the conventional device described above.

34 and 35 are accumulators provided near the differential pressure adjusting section 10a of the replenishment regulating valve 10 and the differential pressure regulating section 16a of the differential pressure regulating valve 16, and pressure changes affect the operation of the respective regulating valves 10 and 16. For example, a large diameter portion is provided and a void is formed at the top.

The gas pressure side of the differential pressure adjustment parts 16a and 10a is the branch pipe part 37.
When either the differential pressure adjustment valve 16 or the replenishment adjustment valve 10 operates, the transient fluctuating gas pressure on the gas pressure side of one adjustment section is added to the gas pressure side of the other adjustment section. There is a tendency to

However, the fluctuating gas pressure is absorbed by the achievers 35 and 34 provided in the branch pipe portions 37b and 37a, and hunting and malfunction are prevented without affecting the other regulating valve.

This facilitates the adjustment work of each regulating valve that is performed in advance.

Reference numeral 36 denotes a gas pressure conduit that branches from the upper part of the hydrogen side waste oil conduit 27 near the turbine generator 1 and leads to the sealed oil treatment device, and branches into relatively short branch pipe parts 37a and 37b to adjust the differential pressure. 10a and 16b.

The above-mentioned accumulators 34 and 35 are attached to the branch pipe portions 37a and 37b.

An orifice 38 is provided in each of the branch pipe portions 37a and 37b.
is provided, and the replenishment regulating valve 10 and the differential pressure regulating valve 16 buffer pressure changes caused by operations from influencing each other.

This orifice 38 narrows the middle of the conduit to increase the internal resistance of the conduit, and when a sudden change in gas pressure occurs from the differential pressure adjustment part 16a or 10a, the resistance of the orifice 38 causes the conduit beyond this orifice to This makes it easier to adjust the adjustment valves 16 and 10.

It should be noted that during the work of adjusting the pressure characteristics of each regulating valve, it is necessary to ensure that the gas pressure fluctuations from the differential pressure regulating section 16a or 10a do not affect each other between the differential pressure regulating valve 16 and the replenishment regulating valve 10 due to the resistance of the conduit only. In some cases, these orifices 38 may be omitted if proven.

In the device according to the embodiment configured as described in Q) above, the gas pressure conduit 36 is connected so that sealing oil with a specified sealing oil pressure (differential pressure) higher than the gas pressure can be supplied to the sealers 5 and 6 at all times. The differential pressure regulating valve 16 is automatically activated by the hydraulic pressure from the branch pipe portion 37b and the hydraulic conduit 33, and the air-side sealing oil pump 7 is operated at a specified value.

If the oil pressure supplied by the air side seal oil pump 7 disappears due to some reason, the seal oil with a seal oil pressure (differential pressure) that is slightly lower than the seal oil pressure (differential pressure) that was operating the differential pressure regulating valve 16. The gas pressure conduit 3
While the replenishment adjustment valve 10 is automatically operated by the hydraulic pressure from the branch pipe section 37a of No. 6 and the hydraulic conduit 32, and the turbine side pump (not shown) is operated through the high pressure oil conduit 9 from the turbine side. This allows the aircraft to remain sealed without releasing cabin gas.

Furthermore, if the hydraulic pressure supplied from the turbine side decreases due to a failure of the hydraulic pump (not shown) on the turbine side or the drive motor of this pump stops due to a power outage, the oil pressure switch will be switched off when the hydraulic pressure supplied from the turbine side drops to the set value. (not shown) operates and issues a low oil pressure alarm, and the emergency seal oil pump 8
Activate the DC automatic starting device.

As a result, the drive DC motor of the seal oil pump 8 is started, and the emergency seal oil pump 8 instead of the air side seal oil pump 7 supplies air side seal oil.

In this way, the differential pressure regulating valve 16 and the replenishment regulating valve 10 are automatically operated and various support means are effectively utilized so that the gas in the turbine generator 1 does not leak to the atmosphere at any time. This ensures safe operation of the generator.

Further, one gas pressure conduit 36 is branched from the upper part of the hydrogen side waste oil conduit 27 near the turbine generator 1, and is branched into branch pipe portions 37a and 37b within the sealed oil treatment device.

In this case, the replenishment regulating valve 10 and the differential pressure regulating valve 16 can operate without problems during normal operation, but if sudden pressure fluctuations occur in these regulating valves, the differential pressure regulating section 10 of each regulating valve
Since the sealing oil pressure (differential pressure) at a and 16a may interfere with each other, accumulators 34 and 35 are provided in both branch pipes m7a and 37b to prevent malfunctions of the regulating valves 10 and 16 due to mutual influence. I'm trying to prevent this from happening.

In the above embodiment, two accumulators are installed, but depending on the characteristics of each regulating valve 10.16 and the length of the conduit, both branch pipe sections 37a may be used.

It may be provided on either one of 37b.

Furthermore, although the above embodiments have been described in the case of a turbine generator, the present invention can be applied to a rotating electric machine that is gas-cooled and requires a sealed oil treatment device, and the same effects as those of the above embodiments can be achieved.

As described above, according to this invention, the gas pressure conduit is led as one from the vicinity of the turbine generator, is branched into two branch pipe parts at the sealed oil treatment equipment part, and at least one of the branch pipe parts has an accumulator. Since the piping is provided, the piping is simplified, the on-site construction work is simplified, equipment costs are reduced, and interference in operation between each regulating valve can be alleviated, making it easier to adjust each regulating valve.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an outline of a conventional sealed oil treatment device for a turbine generator, and FIG. 2 is a system diagram showing an outline of a sealed oil treatment device according to an embodiment of the invention. 1... Turbine generator, 2... Rotating shaft, 3, 4... Bearing, 5, 6... Sealer, 5a, 6a... ...Seal ring, 7...
・Air side seal oil pump, 8...Emergency seal oil pump, 9...High pressure oil conduit, 10...Replenishment adjustment valve, 10a...Difference Pressure adjustment section, 16...
... Differential pressure regulating valve, 16a... Pressure regulating section, 2
7...Hydrogen side drain oil conduit, 32.33...
・Hydraulic conduit, 34° 35...Accumulator, 36...Gas pressure conduit, 37a, 37b...
...Branch pipe section. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In a device that supplies seal oil to a seal installed inside the rotating shaft of a rotating electric machine that is cooled by gas sealed in the machine and seals the shaft, the air-side seal oil pump supplies the seal to the seal. In order to supply seal oil or replenish seal oil using an emergency seal oil pump, a differential pressure regulating valve that automatically adjusts and supplies seal oil to the sealer, and hydraulic pressure from the air side seal oil pump. When the differential pressure drops below a predetermined differential pressure, a replenishment adjustment valve is used to receive the pressure oil on the prime mover side and supply the necessary sealing oil to the sealer, and the drained oil on the gas side of the sealer is sent to the lower hydrogen side oil leveling box. The upper end of the gas-side drain oil conduit for returning the drain oil is connected from the upper horizontal position on the drain oil introduction side, and is branched into two relatively short branch pipes at the lower regulating valve side, which is relatively long apart. A gas pressure conduit connected to the differential pressure adjusting section of the differential pressure regulating valve and the differential pressure regulating section of the replenishment regulating valve transfers the outlet hydraulic pressure of each of the sealing oil pumps to each of the differential pressure regulating valve and the replenishing regulating valve. A hydraulic conduit that leads to the differential pressure adjustment section and operates the valve body of the regulating valve at a predetermined differential pressure value based on the differential pressure between the sealed hydraulic pressure and the gas pressure to adjust the sealed hydraulic pressure; and the gas pressure conduit. A sealing oil treatment device for a rotating electric machine, comprising an accumulator provided in the middle of at least one of the two branch pipe parts.