JPH1042510A - Lubricating device for thrust bearing in dynamo electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cavitation in a high-pressure oil pump and improve the bearing characteristics. SOLUTION: A thrust bearing device 4 is made up of a rotating plate 2 at a rotor 1 and a stationary plate 3 at a bearing bracket 5. The thrust bearing device 4 includes a lubricating oil cooling device 10, made up of an oil cooling unit 7 and a circulating pump, and a thrust push-up device 13 made up of a high-pressure oil pump 11 and a piping unit 12. The piping unit 12 on the inlet side of the high-pressure oil pump 11 is joined with a piping unit 9 on the side of the oil cooling unit 7. The this case, air bubbles in a lubricating oil 6 fed to the high-pressure oil pump 11 are eliminated almost completely at the oil cooling unit 7 to prevent cavitation in the high-pressure oil pump 11. At the same time, air bubbles are not generated in the lubricating oil 6 fed to the thrust bearing device 4, so that the bearing characteristics can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust bearing lubrication system for a vertical shaft type rotating electric machine such as a high-speed large-capacity generator motor, and more particularly, to improving the bearing characteristics when the main engine is started, stopped and at low rotation. The present invention relates to a thrust bearing lubrication device for a rotating electric machine that can be driven.

[0002]

2. Description of the Related Art FIG. 6 shows a high-speed and large-capacity rotary electric machine provided with a conventional thrust bearing lubricating device. In the figure, reference numeral 1 denotes a rotor of the rotary electric machine, which extends axially downward of the rotor 1. Is supported by a thrust bearing device 4 composed of a rotating plate 2 and a stationary plate 3 on the rotor 1 side. That is, as shown in FIG. 6, the rotating plate 2 of the thrust bearing device 4 is fixed to the rotor 1 and rotates together with the rotor 1, while the stationary plate 3 is provided with a stationary-side bearing bracket. 5, a plurality of radially opposed rotary plates 2 are provided. During the operation of the main engine, the lubricating oil 6 constantly enters between the rotary plate 2 and the stationary plate 3 and is stirred, thereby forming a bearing oil film and cooling the bearing.

The thrust bearing device 4 usually includes a lubricating oil cooling device 10 for cooling the lubricating oil 6, which includes an oil cooler 7, a circulating pump 8 and a piping device 9. In order to secure a lubricating oil film between the rotating plate 2 and the stationary plate 3 during rotation, a thrust lifting device 13 including a high-pressure oil pump 11 and a piping device 12 is provided.

The heat generated by the bearing loss of the thrust bearing device 4 is absorbed by the lubricating oil 6, and the temperature of the lubricating oil 6 in the bearing bracket 5, which also functions as an oil tank, gradually increases. 6 is sent to the oil cooler 7 via the piping device 9 by the activation of the circulation pump 8 and cooled,
It is returned to the bearing bracket 5 again and circulates in the lubricating oil cooling device 10. Therefore, the lubricating oil 6 can be sufficiently cooled. At this time, since the lubricating oil 6 is vigorously stirred by the thrust bearing device 4, air is entrained more than necessary and remains as bubbles in the lubricating oil 6, and the lubricating oil 6
However, in the oil cooler 7, it is possible to reduce the flow velocity of the lubricating oil 6 sufficiently to separate bubbles from the lubricating oil 6 almost completely.

[0005] However, even if the cooling capacity is necessary and sufficient during the operation of the main engine, the thrust bearing device 4 is excessively cooled in the preparatory operation of the lubricating oil circulating device before the start of the main engine, and sufficient bearing characteristics are obtained. May not be able to be exhibited.

Further, the thrust lifting device 13 becomes more important as the thrust bearing device 4 having a large capacity and a large load. For example, on the sliding surface between the rotating plate 2 and the stationary plate 3 described above, an ideal dynamic oil film is formed during the operation of the main engine, but when the main engine starts, stops, and rotates at a low speed. Since sufficient relative motion is not made between the rotating plate 2 and the stationary plate 3, the necessary oil film may not be secured. And in this state, there is a possibility that metallic contact may occur. The thrust lifting device 13 is a device for forcibly supplying and protecting a static oil film by high-pressure oil between the rotary plate 2 and the stationary plate 3 in such a case.

The thrust lifting device 13 supplies high-pressure oil to the sliding surface between the rotary plate 2 and the stationary plate 3, so that the lubricating oil 6 is supplied to the high-pressure oil through the piping device 12 from inside the bearing bracket 5 which also serves as an oil tank. It is fed by the oil pump 11. However, as described above, the lubricating oil 6 is supplied to the thrust bearing device 4.
Due to this, a very large amount of air bubbles remain, and the air bubbles may bite into the high-pressure oil pump 11 to cause cavitation, which may cause abnormal noise and vibration. Further, the supply of high-pressure oil containing a large amount of air bubbles to the sliding surface also deteriorates bearing characteristics.

[0008]

In the conventional thrust bearing lubricating apparatus for a rotating electric machine, a lubricating oil cooling apparatus 10 is provided.
Can obtain a necessary and sufficient lubricating oil cooling effect during the operation of the main engine, but in the preparatory operation of the lubricating oil cooling device 10 before the start of the main engine, the thrust bearing device is cooled more than necessary and the bearing characteristics deteriorate. There's a problem.

Further, in the conventional thrust lifting device 13, the use of lubricating oil containing a large amount of air bubbles in the oil tank causes abnormal sound and vibration of the high pressure oil pump 11,
Further, it is not preferable in terms of bearing characteristics that it enters the sliding surface.

Accordingly, an object of the present invention is to provide a thrust bearing lubricating device for a rotating electric machine which can maintain good bearing characteristics at all times even when the main engine is started, stopped and at a low speed, as well as during the operation of the main engine. To provide.

Another object of the present invention is to provide a rotating electric machine capable of preventing bubbles remaining in lubricating oil from being caught in a high-pressure oil pump to cause cavitation, noise and vibration. To provide a thrust bearing lubrication device.

Another object of the present invention is to provide a thrust bearing lubrication device for a rotating electric machine, which can prevent supercooling of the thrust bearing device and improve bearing characteristics.

Another object of the present invention is to provide a thrust bearing lubrication device for a rotating electric machine which can prevent supercooling of a thrust bearing device and can almost completely remove bubbles in lubricating oil. is there.

Still another object of the present invention is to provide a thrust bearing lubricating apparatus for a rotating electric machine which can freely control the temperature of lubricating oil to obtain a most preferable state in terms of bearing characteristics.

[0015]

In order to achieve the above object, the present invention provides a rotating plate mounted on a rotor side of a rotary electric machine, and a stationary plate mounted on a bearing bracket having an oil tank and facing the rotating plate. A thrust bearing device with
An oil cooler, a circulating pump and a piping device, and a lubricating oil cooling device for cooling lubricating oil in the thrust bearing device;
A thrust bearing lubrication device for a rotating electric machine, comprising: a high-pressure oil pump and a piping device; and a thrust lifting device that forms a lubricating oil film between the rotating plate and the stationary plate at the time of starting, stopping, and low rotation of the main engine. The inlet side of the high-pressure oil pump is connected to the outlet side of the oil cooler. Thus, the bubbles in the lubricating oil are almost completely removed in the oil cooler, and it is possible to prevent the generation of abnormal noise and vibration due to cavitation of the high-pressure oil pump.

The present invention is also characterized in that a lubricating oil heating device is provided on the inlet side of the high-pressure oil pump. Accordingly, it is possible to prevent the thrust bearing device from being excessively cooled, and to reduce the viscosity by heating the lubricating oil, so that the bubbles can be easily separated.

According to the present invention, a flow control valve is provided on the inlet side of the oil cooler, and a bypass pipe for flowing the lubricating oil by-passing the oil cooler is connected to the inlet side of the flow control valve. It is characterized by having done. Then, by adjusting the flow rate of the lubricating oil flowing in the oil cooler, it is possible to prevent the thrust bearing device from being excessively cooled.

In the present invention, the inlet side of the high-pressure oil pump is connected to the outlet side of the oil cooler, and a lubricating oil heating device is provided between the high-pressure oil pump and the oil cooler. It is characterized by the following. Thus, it is possible to prevent the thrust bearing device from being excessively cooled, and it is possible to almost completely remove bubbles in the lubricating oil. The present invention is further characterized in that the oil cooler is provided with a heater for heating a cooling medium for cooling lubricating oil. As a result, the temperature of the lubricating oil can be freely controlled, and it is possible to easily obtain the most favorable state in terms of the bearing characteristics according to the operating condition.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a thrust bearing lubricating device for a rotating electric machine according to a first embodiment of the present invention. In the drawing, reference numeral 1 denotes a rotor of the rotating electric machine, and a load of the rotor 1 in an axially downward direction. Are supported by a thrust bearing device 4 composed of a rotating plate 2 and a stationary plate 3 on the rotor 1 side.

That is, as shown in FIG. 1, the rotating plate 2 of the thrust bearing device 4 is fixed to the rotor 1 and rotates with the rotor 1, while the stationary plate 3 is A plurality of the bearing brackets 5 are radially arranged facing the rotating plate 2. During the operation of the main engine, the lubricating oil 6 constantly enters between the rotary plate 2 and the stationary plate 3 and is stirred, thereby forming a bearing oil film and cooling the bearing.

The thrust bearing device 4 includes a lubricating oil cooling device 10 for cooling the lubricating oil 6, which is composed of an oil cooler 7, a circulating pump 8, and a piping device 9, as in the conventional case shown in FIG. A thrust lifting device 13 including a high-pressure oil pump 11 and a piping device 12 for securing a lubricating oil film between the rotating plate 2 and the stationary plate 3 at the time of starting, stopping, and low rotation of the main engine is provided. ing.

However, unlike the conventional case shown in FIG. 6, the piping device 12 on the inlet side of the high-pressure oil pump 11 is not connected to the bearing bracket 5, and as shown in FIG. The lubricating oil 6 after being connected to the piping device 9 on the side and passing through the oil cooler 7 is supplied to the high-pressure oil pump 11.

Next, the operation of the present embodiment will be described. When the main engine starts, stops, and rotates at low speed,
Since a sufficient relative motion is not made between the rotating plate 2 and the stationary plate 3, a necessary oil film may not be secured. Therefore, in such a case, the thrust lifting device 1
3 is started, high-pressure oil from the high-pressure oil pump 11 is supplied to the sliding surface between the rotating plate 2 and the stationary plate 3, and the high-pressure oil is forced between the rotating plate 2 and the stationary plate 3. A typical oil film is formed.

The lubricating oil 6 in the bearing bracket 5
Is stirred by the thrust bearing device 4, so that a very large amount of bubbles remain in the lubricating oil 6. For this reason,
When such a lubricating oil 6 is supplied to the high-pressure oil pump 11, cavitation occurs due to air bubbles being caught in the high-pressure oil pump 11, which may cause abnormal noise and vibration.

However, in the present embodiment, since the lubricating oil 6 after passing through the oil cooler 7 is supplied to the high-pressure oil pump 11, bubbles in the lubricating oil 6 are removed from the oil cooler 7. Can be almost completely removed. For this reason, generation of abnormal noise and vibration due to cavitation of the high-pressure oil pump 11 can be prevented. Further, since the lubricating oil 6 having no air bubbles is supplied to the sliding surface between the rotary plate 2 and the stationary plate 3, the bearing characteristics can be improved.

FIG. 2 shows a second embodiment of the present invention. In FIG.
In the same manner as in the conventional case shown in FIG.
Then, a lubricating oil heating device 14 is provided. In other respects, the configuration is the same as that of the first embodiment.

Next, the operation of the present embodiment will be described. When the lubricating oil heating device 14 is started during the preparatory operation of the lubricating oil cooling device 10 at the time of starting the main engine, the temperature of the lubricating oil 6 rises, for example, by about 10 to 15 ° C., and warm high-pressure oil is supplied to the rotating plate 2 and the stationary plate 3. Supplied to the sliding surface between. For this reason, supercooling of the thrust bearing device 4 can be prevented, and the bearing characteristics can be improved. Further, by heating the lubricating oil 6, the viscosity of the lubricating oil 6 is reduced, and the effect of separating bubbles can be promoted.

FIG. 3 shows a third embodiment of the present invention, in which a piping device 9 of a lubricating oil cooling device 10 is provided with a bypass pipe 15 for bypassing the oil cooler 7. .

That is, a flow control valve 16 such as an electric valve is provided between the oil cooler 7 and the circulation pump 8 of the lubricating oil cooling device 10 as shown in FIG. The upstream end of a bypass pipe 15 having a normally closed relief valve 17 and a check valve 18 that opens at a certain pressure or higher is connected between the circulation pump 16 and the circulation pump 8. The oil cooler 7 is connected to a piping device 9 on the outlet side. Moreover, between this connection part and the oil cooler 7,
A check valve 19 is provided. In other respects, the configuration is the same as that of the conventional case shown in FIG.

Next, the operation of the present embodiment will be described. During normal operation, the flow control valve 16 is fully opened, and all the lubricating oil 6 is sent to the thrust bearing device 4 via the oil cooler 7 to perform cooling. At this time, relief valve 1
7 is in a fully closed state. On the other hand, during the lubricating oil cooling device preparation operation before the main engine is started, the flow control valve 16 is controlled to be fully closed or slightly opened. For this reason, the lubricating oil 6 pressurized by the circulation pump 8 is pressurized to a steady pressure or higher, whereby the relief valve 17 is opened, and most of the lubricating oil 6 flows through the bypass pipe 15.

Simultaneously with the start of the main engine, the opening of the flow control valve 16 is controlled to gradually increase, and is fully opened when the rated speed is reached. Therefore, the entire amount of the lubricating oil 6 is supplied to the oil cooler 7.

However, during the preparatory operation of the lubricating oil cooling device 10 and at the time of starting the main engine, the cooling of the thrust bearing device 4 can be prevented by controlling the flow control valve 16, so that the bearing characteristics can be stabilized. .

FIG. 4 shows a fourth embodiment of the present invention. In the configuration of the first embodiment, a lubricating oil heating device 14 is connected to a piping device 12 on the inlet side of a high-pressure oil pump 11.
Is installed. Thus, the lubricating oil 6 from which the air bubbles have been almost completely removed by the oil cooler 7 can be heated by the lubricating oil heating device 14, so that the supercooling of the thrust bearing device 4 can be prevented, and the thrust bearing device 4 can be prevented. Of the bearing can be improved. FIG. 5 shows a fifth embodiment of the present invention. In the conventional configuration shown in FIG. 6, a heater 21 for heating a cooling medium 20 is provided in an oil cooler 7. is there.

Next, the operation of the present embodiment will be described. During the lubricating oil circulation device preparation operation before the main engine is started, the thrust bearing device 4 may be supercooled as described above. Therefore, in this case, the cooling medium 20 is heated by the heater 21. If the temperature of the lubricating oil 6 is too high, the heater 21 is stopped and the lubricating oil 6 is cooled by the cooling medium 20.

Thus, the temperature of the lubricating oil 6 can be freely controlled, and the most favorable state in terms of bearing characteristics can be obtained according to the operating conditions. Note that the present invention is not limited to the above embodiments, and for example, the configurations of the embodiments may be appropriately combined and used.

[0036]

As described above, according to the present invention, since the inlet side of the high-pressure oil pump is connected to the outlet side of the oil cooler, bubbles in the lubricating oil bite into the high-pressure oil pump. This prevents problems such as cavitation and abnormal noise and vibration, and improves lubrication oil without bubbles by supplying lubricating oil to the sliding surface between the rotating plate and the stationary plate. Can be done.

According to the present invention, since the lubricating oil heating device is provided on the inlet side of the high-pressure oil pump, the thrust bearing device can be prevented from being supercooled and the bearing characteristics can be improved. Due to the decrease in viscosity of lubricating oil,
The effect of separating bubbles can be promoted.

According to the present invention, a flow control valve is provided on the inlet side of the oil cooler, and a bypass pipe for flowing the lubricating oil bypassing the oil cooler is connected to the inlet side of the flow control valve. Therefore, by controlling the opening of the flow control valve,
Supercooling of the thrust bearing device can be prevented, and the bearing characteristics can be stabilized.

According to the present invention, the inlet side of the high-pressure oil pump is connected to the outlet side of the oil cooler, and a lubricating oil heating device is disposed between the high-pressure oil pump and the oil cooler. As a result, air bubbles can be almost completely removed by an oil cooler, and lubricating oil can be heated by a lubricating oil heating device to prevent overcooling of the thrust bearing device. Can be improved.

Further, in the present invention, since the oil cooler is provided with a heater for heating the cooling medium for cooling the lubricating oil, the temperature of the lubricating oil can be freely controlled and the bearing characteristics can be adjusted according to the operating conditions. The most favorable state can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a thrust bearing lubrication device for a rotating electric machine according to a first embodiment of the present invention.

FIG. 2 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 3 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 4 is a diagram corresponding to FIG. 1, showing a fourth embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 1, showing a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a conventional thrust bearing lubrication device for a rotating electric machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotating plate 3 Stationary plate 4 Thrust bearing device 5 Bearing bracket 6 Lubricating oil 7 Oil cooler 8 Circulation pump 9, 12 Piping device 10 Lubricating oil cooling device 11 High-pressure oil pump 13 Thrust lifting device 14 Lubricating oil heating device 15 Bypass piping 16 flow control valve 17 relief valve 20 cooling medium 21 heater

Claims (5)

[Claims] 1. A thrust bearing device comprising: a rotating plate attached to a rotor side of a rotating electric machine; and a stationary plate attached to a bearing bracket side having an oil tank and facing the rotating plate; an oil cooler and a circulation pump. And a lubricating oil cooling device that cools the lubricating oil in the thrust bearing device, and a high-pressure oil pump and a piping device, between the rotating plate and the stationary plate at the time of starting, stopping, and low rotation of the main engine. A thrust lifting device for forming a lubricating oil film on the rotary electric machine, wherein an input side of the high-pressure oil pump is connected to an output side of the oil cooler. Thrust bearing lubrication device. 2. A thrust bearing device comprising: a rotating plate mounted on a rotor side of a rotating electric machine; and a stationary plate mounted on a bearing bracket side having an oil tank and facing the rotating plate; an oil cooler and a circulation pump. And a lubricating oil cooling device that cools the lubricating oil in the thrust bearing device, and a high-pressure oil pump and a piping device, between the rotating plate and the stationary plate at the time of starting, stopping, and low rotation of the main engine. A thrust bearing lubrication device for a rotary electric machine, comprising: a thrust lifting device that forms a lubricating oil film on the rotary electric machine, wherein a lubricating oil heating device is provided on the input side of the high-pressure oil pump. Lubrication device. 3. A thrust bearing device comprising: a rotary plate mounted on a rotor side of a rotary electric machine; and a stationary plate mounted on a bearing bracket side having an oil tank and opposed to the rotary plate; an oil cooler and a circulation pump. And a lubricating oil cooling device that cools the lubricating oil in the thrust bearing device, and a high-pressure oil pump and a piping device, between the rotating plate and the stationary plate at the time of starting, stopping, and low rotation of the main engine. A thrust lifting device for forming a lubricating oil film, and a thrust bearing lubrication device for a rotating electrical machine, comprising: a flow control valve on the inlet side of the oil cooler;
A thrust bearing lubrication device for a rotating electric machine, characterized in that a bypass pipe through which lubricating oil flows by bypassing an oil cooler is connected to an inlet side of the flow control valve. 4. A thrust bearing device comprising: a rotary plate mounted on a rotor side of a rotary electric machine; and a stationary plate mounted on a bearing bracket side having an oil tank and facing the rotary plate; an oil cooler and a circulation pump. And a lubricating oil cooling device that cools the lubricating oil in the thrust bearing device, and a high-pressure oil pump and a piping device, between the rotating plate and the stationary plate at the time of starting, stopping, and low rotation of the main engine. A thrust bearing lubricating device for a rotating electrical machine, comprising: a thrust lifting device that forms a lubricating oil film on the rotary shaft; an input side of the high-pressure oil pump connected to an output side of the oil cooler; A thrust bearing lubrication device for a rotating electric machine, wherein a lubricating oil heating device is disposed between the cooling device and a cooler. 5. A thrust bearing device comprising: a rotating plate mounted on a rotor side of a rotating electric machine; and a stationary plate mounted on a bearing bracket side having an oil tank and facing the rotating plate; an oil cooler and a circulation pump. And a lubricating oil cooling device that cools the lubricating oil in the thrust bearing device, and a high-pressure oil pump and a piping device, between the rotating plate and the stationary plate at the time of starting, stopping, and low rotation of the main engine. A thrust lifting device for forming a lubricating oil film on a thrust bearing lubricating device for a rotary electric machine, comprising: a lubricating oil cooler, wherein a warming device for heating a lubricating oil cooling medium is provided. Thrust bearing lubrication device for rotating electric machines.