JP3497732B2 - Sealing oil supply device for rotating electric machines - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal oil supply device for a rotary electric machine, which supplies vacuum seal gas for sealing hydrogen gas to a rotary electric machine, such as a turbine generator, by vacuum degassing.

[0002]

2. Description of the Related Art FIG. 5 shows, for example, JP-A-60-102838.
It is a block diagram which shows the sealing oil supply device of the conventional rotary electric machine shown by the publication. In the figure, reference numeral 1 denotes a rotating electric machine in which hydrogen gas for coil cooling is sealed.
Has a rotating shaft 1a. Reference numeral 2 is a penetrating portion of the rotating shaft 1a of the rotary electric machine 1, and a sealer 3 for sealing hydrogen gas in the rotary electric machine 1 is a sealing oil for temporarily retaining the seal oil discharged from the inside of the machine. It is a bubble remover for removing bubbles inside.

Reference numeral 4 denotes a loop seal tank connected to the sealer 2 for temporarily retaining the outer side sealing oil and bearing exhaust oil and discharging hydrogen gas and air. Reference numeral 5 denotes hydrogen gas in the rotating electric machine 1. A hydrogen gas blocking tank for blocking outflow to the outside, 6 is connected to the loop seal tank 4 and the hydrogen gas blocking tank 5 to deaerate air and hydrogen gas contained in the sealing oil and degassed sealing oil A vacuum tank that stores
7 is a float valve provided in the vacuum tank 6 for maintaining the position of the oil level in the vacuum tank 6, and 8 is an alarm device (not shown) for detecting an abnormal rise in the position of the oil level in the vacuum tank 6. This is an oil level detector that outputs a signal to.

A spray nozzle tube 9 is provided in the vacuum tank 6 for promoting deaeration of the sealing oil by spraying the sealing oil, and 10 is provided in the vacuum tank 6 for exposing the sealing oil to a vacuum. A plurality of degassing trays 11 for promoting degassing of the sealing oil are provided in the vacuum tank 6, and the float valve 7
This is a return oil introducing pipe for guiding the sealing oil flowing in from above to the degassing tray 10.

Reference numeral 12 is a sealer 2 for sealing oil in the vacuum tank 6.
And a sealing oil pump for sending to the spray nozzle pipe 9, 13 is a vacuum pump unit for evacuating the inside of the vacuum tank 6, and 14 is a differential pressure adjusting valve connected between the sealing oil pump 12 and the spray nozzle pipe 9. The differential pressure adjusting valve 14 adjusts the pressure of the sealing oil supplied to the sealing device 2 to be higher than the pressure of the hydrogen gas in the rotary electric machine 1 by a predetermined value. Reference numeral 15 is an outlet valve of a pump circuit connected between the seal oil pump 12 and the sealer 2.

Next, the operation will be described. Rotating electric machine 1
The hydrogen gas inside is sealed by the sealing oil inside the sealing device 2. Further, in order to prevent the sealing oil in the sealing device 2 from becoming high temperature due to shear heat, the sealing oil in the sealing device 2 is circulated in the sealing oil supply circuit. Furthermore, in order to prevent the air contained in the sealing oil from entering the rotary electric machine 1 and lowering the purity of the hydrogen gas, the sealing oil circulating in the sealing oil supply circuit is degassed. In the sealing oil supply circuit during normal operation, the sealing oil is drawn from the vacuum tank 6 by the sealing oil pump 12,
Most of it is returned to the vacuum tank 6 by the differential pressure regulating valve 14, and deaeration is promoted by the spray nozzle tube 9 and the deaeration tray 10.

On the other hand, most of the sealing oil supplied from the vacuum tank 6 to the sealer 2 is pushed out to the outside of the machine along the rotary shaft 1a and returned to the vacuum tank 6 through the loop seal tank 4 together with the bearing oil. . The remaining portion of the sealing oil supplied to the sealer 2 is pushed out from the inside of the machine to the bubble remover 3, and after the bubbles are removed by the bubble remover 3, it is sent to the hydrogen gas cutoff tank 5. In the hydrogen gas blocking tank 5, hydrogen gas in the sealing oil is separated. In the hydrogen gas shutoff tank 5,
When the sealing oil flows in, the float valve is slightly opened, and the inflowing sealing oil is discharged.

When the position of the oil level in the vacuum tank 6 is lowered,
The float valve 7 opens, and the sealing oil from the loop seal tank 4 and the hydrogen gas blocking tank 5 flows into the vacuum tank 6.
A large amount of air is dissolved in the sealing oil flowing in from the loop seal tank 4 and hydrogen gas is dissolved in the sealing oil flowing in from the hydrogen gas blocking tank 5, but these sealing oils flowing in from the float valve 7 are returned. The oil is introduced into the degassing tray 10 by the oil introduction pipe 11, and the degassing is promoted while the plurality of degassing dishes 10 are being dropped. In this way, the sealing oil is repeatedly circulated in the sealing oil supply circuit.

[0009]

In the conventional seal oil supply device for a rotary electric machine constructed as described above, the loop seal tank 4 and the hydrogen gas shutoff tank 5 to the vacuum tank 6 are provided.
In addition to the sealing oil that has flowed in, the sealing oil returned from the differential pressure regulating valve 14 to the inside of the vacuum tank 6 is also guided to the deaeration tray 10 to promote deaeration. In this way, the circuit structure for further degassing the sealing oil returned to the vacuum tank 6 is designed so that a large amount of air contained in the sealing oil accumulated in the vacuum tank 6 during the initial operation can be quickly discharged. This is to degas.

However, in such a circuit configuration, since a large amount of sealing oil is always sent to the degassing tray 10 even during normal operation, it is necessary to make the degassing tray 10 sufficiently large. There was a problem that the whole became large. In addition, the sealing oil from the loop seal tank 4 which should be originally degassed is mixed with the sealing oil returned from the differential pressure regulating valve 14, so that the degassing effect is reduced. In other words, it is necessary to return the sealing oil from the differential pressure adjusting valve 14 and to pass the degassing tray 10 many times, because a sufficient effect cannot be obtained by degassing once. Was becoming larger.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the sealing oil supply of a rotary electric machine can be made compact by downsizing the vacuum tank. The purpose is to obtain the device.

[0012]

According to a first aspect of the present invention, there is provided a sealing oil supply device for a rotary electric machine, which is provided in a hydrogen gas sealing portion of a rotary electric machine in which hydrogen gas is sealed, and rotates the hydrogen gas by the sealing oil. A sealer that seals inside the electric machine, a vacuum tank that degass the sealing oil discharged from this sealer and stores the degassed sealing oil, and a vacuum tank that is provided inside this vacuum tank The degassing tray that accelerates degassing by exposing the sealant to the vacuum tank, the sealing oil pump that supplies the sealing oil in the vacuum tank to the sealer and returns it to the vacuum tank, and bypass the sealer from this sealing oil pump. Bypass sealing oil introducing means for introducing the sealing oil returned into the vacuum tank into the vacuum tank, the bypass sealing oil introducing means is a vacuum
Spray nozzle tube for spraying sealing oil into the vacuum in the tank
, And the sealer sealing oil which has flowed into the discharged vacuum tank, and one from the bypass sealing oil introduction means of sealing oil introduced into the vacuum tank, during normal operation, only the former sealing oil is Datsukisara It is configured to pass through.

According to the second aspect of the present invention, the seal oil supply device for a rotary electric machine uses, as the bypass seal oil introduction means, a spray nozzle tube for spraying the seal oil toward the inner wall surface of the vacuum tank.

According to the third aspect of the present invention, the seal oil supply device for a rotary electric machine uses, as the bypass seal oil introduction means, a bypass pipe having a tip end opening on the oil surface in the vacuum tank.

According to a fourth aspect of the present invention, in the sealing oil supply device for a rotary electric machine, the vacuum tank is provided with an initial degassing introducing means for introducing the sealing oil onto the degassing tray at the time of initial degassing, and the bypass sealing oil introducing means is provided. And the introduction means for initial degassing can be selectively switched.

A sealing oil supply device for a rotary electric machine according to a fifth aspect of the present invention uses a spray nozzle tube for spraying the sealing oil onto a degassing tray as an initial degassing introduction means.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 is a block diagram showing a sealing oil supply device for a rotary electric machine according to Embodiment 1 of the present invention. In the figure, reference numeral 1 is a rotary electric machine in which hydrogen gas for cooling a coil is sealed, and the rotary electric machine 1 has a rotary shaft 1a. Reference numeral 2 denotes a penetrating portion of the rotary shaft 1a of the rotating electric machine 1, that is, a sealing portion for hydrogen gas, and a sealer 3 for sealing the hydrogen gas inside the rotating electric machine 1 and 3 temporarily stores sealing oil discharged from the inside of the machine. The air bubble remover removes air bubbles in the sealing oil by allowing the air to stay therein.

Reference numeral 4 denotes a loop seal tank connected to the sealer 2 for temporarily retaining the outer side sealing oil and bearing exhaust oil and discharging hydrogen gas and air. Reference numeral 5 denotes hydrogen gas in the rotating electric machine 1. A hydrogen gas blocking tank for blocking outflow to the outside, 6 is connected to the loop seal tank 4 and the hydrogen gas blocking tank 5 to deaerate air and hydrogen gas contained in the sealing oil and degassed sealing oil A vacuum tank that stores
7 is a float valve provided in the vacuum tank 6 for maintaining the position of the oil level in the vacuum tank 6, and 8 is an alarm device (not shown) for detecting an abnormal rise in the position of the oil level in the vacuum tank 6. This is an oil level detector that outputs a signal to.

Reference numeral 21 is provided so as to face the inner wall surface of the vacuum tank 6, and a spray nozzle tube as a bypass sealing oil introducing means for promoting degassing of the sealing oil by spraying the sealing oil is provided with a spray nozzle tube 10 and an inside of the vacuum tank 6. A plurality of degassing pans 11 provided in the vacuum tank 6 for promoting degassing of the sealing oil by exposing the sealing oil to a vacuum; It is a return oil introduction pipe that leads to the top.

Reference numeral 12 denotes a sealer 2 for sealing oil in the vacuum tank 6.
And a sealing oil pump to be sent to the spray nozzle pipe 21, 13 is a vacuum pump unit for evacuating the inside of the vacuum tank 6, and 14 is a differential pressure adjusting valve connected between the sealing oil pump 12 and the spray nozzle pipe 21. The differential pressure adjusting valve 14 adjusts the pressure of the sealing oil supplied to the sealing device 2 to be higher than the pressure of the hydrogen gas in the rotary electric machine 1 by a predetermined value. 15 is a sealing oil pump 12 and a sealing device 2
Is an outlet valve of a pump circuit connected between and.

In such a sealing oil supply device, the sealing oil accumulated in the vacuum tank 6 is initially deaerated during the initial operation. That is, the outlet valve 15 is fully closed, and the entire amount of the sealing oil that has passed through the sealing oil pump 12 is sprayed from the spray nozzle pipe 21 toward the inner wall surface of the vacuum tank 6. By performing such initial deaeration for a predetermined time, the sealing oil accumulated in the vacuum tank 6 is sufficiently deaerated.

After the initial degassing is completed, the outlet valve 15 is opened and the sealing oil is supplied to the sealing device 2. After that, the sealing oil is circulated between the sealer 2 and the vacuum tank 6, but what is guided onto the degassing tray 10 is that the loop seal tank 4 and the hydrogen gas cutoff tank 5 flow into the vacuum tank 6. The sealing oil to be returned to the vacuum tank 6 from the differential pressure regulating valve 14, that is, the sealing oil bypassing the sealer 2 is sprayed from the spray nozzle pipe 21 toward the inner wall surface of the vacuum tank 6, It flows to the bottom of the vacuum tank 6 without passing through the deaeration tray 10.

In such a sealing oil supply device, the sealing oil returned from the differential pressure adjusting valve 14 into the vacuum tank 6 is the degassing tray 1.
Since it does not pass through 0, the degassing tray 10 can be downsized, and thus the vacuum tank 6 and the entire apparatus can be downsized. In addition, since the amount of sealing oil that passes through the degassing tray 10 during normal operation is reduced, it is possible to enhance the degassing effect on the sealing oil that flows into the vacuum tank 6 from the loop seal tank 4 and the hydrogen gas blocking tank 5. Furthermore, by downsizing the entire apparatus, it is possible to shorten the installation period, reduce the installation space, improve the maintainability of the vacuum tank 6, and reduce the manufacturing cost.

On the other hand, at the time of initial deaeration, the deaeration effect is reduced by the amount that the deaeration tray 10 is not used, but if the initial deaeration time is lengthened, the spray nozzle tube 21 alone can be sufficiently deaerated. This is possible, and this time can be secured sufficiently during the initial operation, which is not a restriction.

Embodiment 2. Next, FIG. 2 is a configuration diagram showing a sealing oil supply device for a rotary electric machine according to Embodiment 2 of the present invention. In the figure, 22 is a first spray nozzle tube as an initial degassing introduction means for spraying the sealing oil returned from the differential pressure regulating valve 14 into the vacuum tank 6 on the degassing tray 10,
Reference numeral 23 is a second spray nozzle pipe as a bypass sealing oil introducing means for spraying the sealing oil returned from the differential pressure regulating valve 14 into the vacuum tank 6 toward the inner wall surface of the vacuum tank 6, 24
Is a three-way valve connected between the spray nozzle pipes 22 and 23 and the differential pressure regulating valve 14 and selectively switching the spray nozzle pipes 22 and 23 to be used. Other configurations are similar to those of the first embodiment.

In such a sealing oil supply device, the sealing oil returned from the differential pressure adjusting valve 14 to the vacuum tank 6 is sprayed from the first spray nozzle pipe 22 at the time of initial deaeration, and is sprayed at the second spray at the time of normal operation. It is sprayed from the nozzle tube 23. Therefore, the time required for initial degassing can be shortened as compared with the first embodiment, and the degassing tray 10 can be downsized and the degassing effect during normal operation can be enhanced.

Embodiment 3. Next, FIG. 3 is a configuration diagram showing a sealing oil supply device for a rotary electric machine according to a third embodiment of the present invention. In the figure, reference numeral 25 is a spray nozzle tube as an initial degassing introduction means for spraying the sealing oil returned from the differential pressure regulating valve 14 into the vacuum tank 6 on the degassing tray 10, and 26 is a tip portion inside the vacuum tank 6. Of the bypass nozzle as an bypass sealing oil introducing means for introducing the sealing oil into the vacuum tank 6 from the differential pressure adjusting valve 14, and 27 is a differential pressure adjusting with the spray nozzle pipe 25 and the bypass pipe 26. Connected between the valve 14 and the spray nozzle pipe 25 and the bypass pipe 2
This is a three-way valve that selectively switches 6 and 6. Other configurations are
It is similar to the first embodiment.

In such a sealing oil supply device, the sealing oil returned from the differential pressure regulating valve 14 to the vacuum tank 6 is sprayed from the spray nozzle pipe 25 at the time of initial degassing, and from the bypass pipe 26 to the vacuum tank 6 at the time of normal operation. It is directly flown into. Therefore, the time required for initial degassing can be shortened as compared with the first embodiment, and the degassing tray 10 can be downsized and the degassing effect during normal operation can be enhanced. Further, during normal operation, the sealing oil is returned to the vacuum tank 6 by the bypass pipe 26, so that the configuration is simple and the overall cost is low.

Fourth Embodiment Next, FIG. 4 is a configuration diagram showing a sealing oil supply device for a rotary electric machine according to a fourth embodiment of the present invention. In the figure, reference numeral 28 is a bypass pipe as a bypass sealing oil introduction means for introducing sealing oil into the vacuum tank 6 from the differential pressure adjusting valve 14 with its tip opening on the oil surface in the vacuum tank 6. Other configurations are similar to those of the first embodiment.

In such an apparatus, since the spray nozzle tube is not used at all, the time required for initial deaeration is longer than that of the first embodiment, but the structure is greatly simplified and the overall cost is reduced. .

[0031]

As described above, the seal oil supply device for a rotary electric machine according to the first aspect of the present invention introduces the bypass seal oil.
A spray means for spraying the sealing oil into the vacuum in a vacuum tank.
Of the sealing oil that has been used as a nozzle tube and that has been discharged from the sealer and has flowed into the vacuum tank, and the sealing oil that has been introduced into the vacuum tank from the bypass sealing oil introduction means, only the former sealing oil is degassed during normal operation. Since it is configured to pass through the plate, the deaeration plate can be downsized, and the vacuum tank and the entire apparatus can be downsized. Further, the deaeration effect of the sealing oil discharged from the sealer and flowing into the vacuum tank can be enhanced.

In the sealing oil supply device for a rotating electric machine according to the second aspect of the present invention, since the spray nozzle tube for spraying the sealing oil toward the inner wall surface of the vacuum tank is used as the bypass sealing oil introducing means, the degassing tray is used. The deaeration effect of the sealing oil that does not pass can be enhanced, and the time required for initial deaeration can be shortened.

According to the third aspect of the invention, the seal oil supply device for a rotary electric machine uses a bypass pipe whose front end is open above the oil surface in the vacuum tank as the bypass seal oil introduction means. The device can be made inexpensive.

According to a fourth aspect of the present invention, in the sealing oil supply device for a rotary electric machine, the vacuum tank is provided with an initial degassing introduction means for introducing the sealing oil onto the degassing tray at the time of initial degassing. Since the introduction means for initial degassing can be selectively switched, the time required for initial degassing can be further shortened.

In the sealing oil supply device for the rotating electric machine according to the fifth aspect of the present invention, since the spray nozzle tube for spraying the sealing oil on the degassing tray is used as the initial degassing introduction means, the effect of the initial degassing is achieved. Can be increased.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a sealing oil supply device for a rotary electric machine according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a sealing oil supply device for a rotary electric machine according to Embodiment 2 of the present invention.

FIG. 3 is a configuration diagram showing a sealing oil supply device for a rotary electric machine according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a sealing oil supply device for a rotary electric machine according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing an example of a conventional sealing oil supply device for a rotary electric machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 rotary electric machine, 2 sealing device, 6 vacuum tank, 10 degassing tray, 12 sealing oil pump, 21 spray nozzle pipe (bypass sealing oil introducing means), 22 1st spray nozzle pipe (initial degassing introducing means), 23 second spray nozzle pipe (bypass sealing oil introducing means), 25 spray nozzle pipe (initial degassing introducing means), 26, 28 bypass pipe (bypass sealing oil introducing means).

Claims (5)

(57) [Claims] 1. A sealer provided in a hydrogen gas sealing portion of a rotating electric machine in which hydrogen gas is sealed, for sealing the hydrogen gas in the rotating electric machine with a sealing oil, and a sealing oil discharged from the sealer. A vacuum tank for degassing and storing degassed sealing oil; a degassing tray provided in the vacuum tank for promoting degassing by exposing the sealing oil to a vacuum; and the vacuum tank. A sealing oil pump for supplying the sealing oil inside the sealing tank to the sealing tank and returning the sealing oil to the inside of the vacuum tank, and the sealing oil returned from the sealing oil pump to the vacuum tank by bypassing the sealing tank. And a bypass sealing oil introducing means for introducing into the interior of the vacuum tank.
It is a spray nozzle tube that sprays sealing oil into the vacuum inside
Of the sealing oil discharged from the sealer and flowing into the vacuum tank, and the sealing oil introduced into the vacuum tank from the bypass sealing oil introducing means, only the former sealing oil is included during normal operation. A sealing oil supply device for a rotary electric machine, which is configured to pass through the deaeration tray. 2. The spray nozzle tube is provided with the vacuum tank.
The seal oil supply device for a rotary electric machine according to claim 1, wherein the seal oil is sprayed toward the inner wall surface of the rotary electric machine. 3. Water for a rotating electric machine in which hydrogen gas is sealed.
It is installed in the elemental gas sealed part, and the hydrogen gas is
A sealing device that seals the inside of the rotating electric machine and degasses the sealing oil discharged from the sealing device.
A vacuum tank that stores the degassed sealing oil and a vacuum tank that is provided inside this vacuum tank to expose the sealing oil to vacuum.
And a degassing tray that accelerates degassing by supplying the sealing oil in the vacuum tank to the sealer.
In addition, a sealing oil pump for returning to the inside of the vacuum tank, and bypassing the sealing device from the sealing oil pump,
Introduce the sealing oil returned to the empty tank into the vacuum tank
Bypassing a sealing oil introduction means, the bypass sealing oil introducing means, Ri bypass pipe der which opens onto the oil surface in the vacuum tank, the sealer to
The sealing oil discharged into the vacuum tank, and
Guided from the bypass seal oil introduction means into the vacuum tank.
Of the injected sealing oil, during normal operation, the former sealing oil
Only sealing oil supply device of the rotary electric machine you characterized by being configured to pass through the degassing tray. 4. Water for a rotating electric machine in which hydrogen gas is sealed.
It is installed in the elemental gas sealed part, and the hydrogen gas is
A sealing device that seals the inside of the rotating electric machine and degasses the sealing oil discharged from the sealing device.
A vacuum tank that stores the degassed sealing oil and a vacuum tank that is provided inside this vacuum tank to expose the sealing oil to vacuum.
And a degassing tray that accelerates degassing by supplying the sealing oil in the vacuum tank to the sealer.
In addition, a sealing oil pump for returning to the inside of the vacuum tank, and bypassing the sealing device from the sealing oil pump,
Introduce the sealing oil returned to the empty tank into the vacuum tank
A bypass seal oil introduction means for discharging the sealer and flowing into the vacuum tank.
Enter the sealing oil and the above bypass sealing oil introduction means.
Of the sealing oil introduced in the vacuum tank, during normal operation
Is configured so that only the former sealing oil passes through the degassing dish.
The vacuum tank is provided with an initial degassing introducing means for introducing the sealing oil onto the degassing tray during the initial degassing, and the bypass sealing oil introducing means and the initial degassing introducing means are selectively provided. sealing oil supply device for you, wherein it is in the switchable rotary electric machine. 5. The seal oil supply device for a rotary electric machine according to claim 4, wherein the introduction means for initial degassing is a spray nozzle tube for spraying the seal oil onto the degassing tray.