JP2000170638A - Close-circulation cooling device for rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a primary side cooling water system. SOLUTION: A heat exchanger 16 is arranged on the end of a hydraulic iron pipe 1, a cooling water pipe 20A of an advancing passage is arranged on the outflow side A, and a cooling water pipe of a return passage 20B is connected to a circulating pump 7 and to the inflow side H of the heat exchanger. In the heat exchanger 16, circulating cooling water having the raised temperature is taken as the secondary side and heat-exchanged for power generating water as primary side cooling water flowing in the hydraulic iron pipe 1, and the circulating cooling water having the raised temperature is cooled. Therefore, cooled circulating cooling water having the low temperature is circulated by being allowed to flow out to the cooling water pipe 20A by discharging force of the circulating pump 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing cooling device for a rotary machine or a closed circulation type cooling device for a rotary machine for supplying a cooling medium such as cooling water to an air cooling device.

[0002]

2. Description of the Related Art Rotary machines such as generators and electric motors are provided with guide bearings and thrust bearings for supporting rotating parts. When the rotating part rotates, frictional heat is generated between the rotating part and the stationary part of the bearing, thereby increasing the temperature of the lubricating oil in the bearing oil tank. Therefore, it is necessary to cool the lubricating oil in order to continuously operate the rotary machine for a long time. Although cooling air is usually supplied to cool the stator windings and the like, it is necessary to cool the air since the cooling air is circulated in a closed rotary machine.

In general, bearing lubricating oil for a thrust machine and a rotating machine connected thereto, or cooling air for the rotating machine, supplies river water from a penstock or a suction pipe directly to the cooler, Although the lubricating oil or cooling air is cooled, if the water quality of the river is poor, a closed circulation type is often applied because it adversely affects the cooler or the equipment on the cooling water piping system.

FIG. 9 is a view showing an example of the above-mentioned closed-circulation cooling device for a rotary machine.

In the figure, a penstock 1 as a hydraulic conduit extending from a reservoir (not shown) is connected to a water turbine room 5 through an inlet valve 2. The lower part of the water turbine room 5 is connected to the suction pipe 6. In the upper part of the water turbine room 5, the generator 3 is provided. The generator 3 has a generator upper bearing 3a at an upper part, a generator lower bearing 3b at a lower part, and a generator air cooling pipe 4 around the generator 3. The water turbine bearing 5a is provided between the water turbine room 5 and the generator lower bearing 3b.

In the drawing, bearing lubricating oil or circulating cooling water serving as a cooling medium for stator cooling air is used as secondary cooling water to form a turbine wheel bearing 5a, a generator upper bearing 3a, a generator lower bearing 3b, and a generator air. A circulating cooling water system is formed by the heat exchanger 8 and a cooler such as the cooling pipe 4 on the rotating machine side, and the circulating cooling water is circulated through the circulating cooling water system by the circulating pump 7.

[0007] The circulating cooling water is heat-absorbed by the cooling of the bearing lubricating oil and cooling air by the turbine wheel bearing 5a, the generator upper bearing 3a, the generator lower bearing 3b, and the generator air cooling pipe 4, and the temperature rises. The warmed circulating cooling water is circulated to the heat exchanger 8 by the circulating pump 7, and the heat is released and cooled by the heat exchanger 8. The cooled circulating cooling water is supplied to the circulating pump 7
Thus, the lubricating oil and the cooling air supplied to the turbine wheel bearing 5a, the generator upper bearing 3a, the generator lower bearing 3b, and the generator air cooling pipe 4 are cooled again.

On the other hand, there is a system in which the primary cooling water is taken from the penstock 1 or the suction pipe 6, but FIG. 9 shows a system in which the primary cooling water is taken from the suction pipe 6. The primary cooling water taken in by the primary cooling water supply pump 9 removes foreign matter in the primary cooling water by the primary cooling water strainer 10, and then absorbs the heat of the circulating cooling water in the heat exchanger 8, and then draws out the suction pipe. Drained to

[0009]

If the river water is of good quality, the river water from the penstock or the suction pipe is directly supplied as cooling water to the air cooler of the oil cooler of the bearing of the rotating machine. However, when the quality of the river water is poor, a closed circulation type cooling device is applied in order to exert an effect such as wear and corrosion of the cooler or the equipment on the cooling water system or attachment of foreign matter. However, in the conventional closed circulation type cooling device, each oil cooler and generator air cooling pipe of the turbine wheel bearing 5a, the generator upper bearing 3a, and the generator lower bearing 3b, which are components of the circulation cooling water system shown in FIG. 4 and circulation pump 7
In addition, as a primary cooling water system device, a primary cooling water supply pump 9, a primary cooling water strainer 10, and a heat exchanger 8 are required, and many devices are required. This not only complicates the cooling water system, but also complicates the electric control device that controls them.

Further, a turbine wheel bearing 5a and a generator upper bearing 3
In the circulating cooling water system that supplies cooling water to the a, the generator lower bearing 3b, and the generator air cooling pipe 4, fresh water can be used and adverse effects due to river water can be prevented, but cooling water is supplied to the heat exchanger 8. Because the river water is used in the primary cooling water system, wear, corrosion, or
Influences such as adhesion of foreign matter remain. This shortens the life of the equipment,
There is a problem of maintainability and reliability.

Therefore, the present invention eliminates the need for a conventional cooling water feed pump, a primary cooling water strainer, a primary cooling pipe, and the like, and simplifies the equipment configuration, while maintaining high maintainability and high reliability. It is an object of the present invention to provide a closed circulation cooling device for a rotating machine.

[0012]

According to a first aspect of the present invention, water for power generation is introduced into a water turbine room from an upstream side through a hydraulic line, or from a water discharge line on the downstream side through a water turbine room and a hydraulic line. The cooling medium is supplied from a closed closed circulating cooling medium system to various cooling units such as a bearing lubricating oil cooler of a rotating machine or an air cooler of a rotating machine provided at a power plant that pumps water upstream. In a closed-circulation cooling device of a rotary machine for cooling each part, a heat exchanger is provided in a hydraulic line so that heat is exchanged between a circulating cooling medium flowing in a closed-circulation cooling medium system and power generation water flowing in a hydraulic line. Is provided to cool the circulating cooling medium. According to this means, the heat is directly exchanged between the circulating cooling medium and the power generation water flowing in the hydraulic pressure line to cool the circulating cooling medium. A cooling water strainer, a primary cooling water pipe, and the like become unnecessary, and the cooling effect is improved. Therefore, the device as a whole is simplified and has excellent maintenance and reliability.

According to a second aspect of the present invention, in the closed circulation type cooling apparatus for a rotary machine according to the first aspect, the hydraulic pipeline is configured to exchange heat between the power generation water flowing in the penstock of the hydraulic pipeline and the circulating cooling medium. A heat exchanger is provided on the penstock upstream of the inlet valve of the chiller to cool the circulating cooling medium, or the water for power generation and the circulating cooling medium flowing in the casing provided downstream of the inlet valve of the hydraulic pipeline are In this case, a heat exchanger is provided in the casing to exchange heat, and the circulating cooling medium is cooled. According to this means, since the circulating cooling medium is cooled by directly exchanging heat between the circulating cooling medium and the penstock or the power generation water flowing in the casing, the primary cooling water supply of the conventional primary-side cooling water system is performed. A pump, a primary cooling water strainer, and a primary cooling water pipe are not required, and the cooling effect is improved.

According to a third aspect of the present invention, in the closed circulation type cooling apparatus for a rotary machine according to the first aspect, the heat exchanger is configured to exchange heat between the power generation water flowing in the penstock and the circulating cooling medium. The first heat exchanger is provided on the penstock on the more upstream side, and the casing on the downstream side of the inlet valve is provided with a heat exchange between the power generation water flowing in the casing provided on the downstream side of the inlet valve and the circulating cooling medium. A second heat exchanger is provided, and a circulating cooling medium pipe of the first heat exchanger and the second heat exchanger is connected so as to communicate in series to form a circulating cooling medium system to cool the circulating cooling medium. It is something to do. According to this means, in addition to the operation of the first aspect of the present invention, both the penstock and the casing are equipped with heat exchangers. In the case where the heat exchanger of the present invention cannot be installed, the heat exchanger can be separately arranged on both the penstock and the casing, and the cooling effect can be made equal to or more than that of the second invention.

According to a fourth aspect of the present invention, there is provided the first to third aspects.
In the closed circulation type cooling apparatus for a rotary machine according to any one of the above, the heat exchanger, or the first heat exchanger and the second heat exchanger, may be a penstock or a circulating cooling medium provided to surround the outer periphery of the casing. And an outlet ring pipe for introducing a circulating cooling medium provided in correspondence with the inlet ring pipe and having substantially the same shape as the inlet ring pipe, and communicating between the inlet ring pipe and the outlet ring pipe. A plurality of cooling pipes are provided in the penstock or the casing in parallel with the flow of the power generation water, and heat exchange is performed with the power generation water flowing in the penstock or the casing. In this way, the circulating cooling medium in the cooling pipe is cooled. According to this means, the cooling effect of the circulating cooling medium is improved because a large number of cooling pipes are disposed in the penstock or the casing to exchange heat with the water for power generation flowing in the penstock or the casing. Can be improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a closed-circulation cooling device for a rotary machine according to a first embodiment of the present invention.

In the figure, a penstock 1 extending from a reservoir (not shown) is connected to a water turbine room 5 through an inlet valve 2. The lower part of the water turbine room 5 is connected to the suction pipe 6.

In the upper part of the water turbine room 5, a generator 3 is provided. The generator 3 has a generator upper bearing 3a at an upper part, a generator lower bearing 3b at a lower part, and a generator air cooling pipe 4 around the generator 3. And a water turbine bearing 5a is provided between the water turbine room 5 and the generator lower bearing 3b.

At the end of the penstock 1, a heat exchanger 16 using circulating water as a cooling medium is arranged. The heat exchanger 16 has an outgoing side cooling medium pipe (hereinafter referred to as a cooling water pipe) 20A disposed on the outflow side A. The cooling water pipe 20A is branched by a branch portion B into a cooling water pipe 20a.
Is connected to a cooler (not shown) of the generator upper bearing 3a.

The cooling water pipe 20A is branched by a branch C into a cooling water pipe 20b and connected to the generator air cooling pipe 4. The cooling water pipe 20A is branched into a cooling water pipe 20c and a cooling water pipe 20d by a branch portion D, and the cooling water pipe 20c is connected to a cooler (not shown) of the generator lower bearing 3b. 20d is a water turbine bearing 5
a is connected to a cooler (not shown).

The above-mentioned cooling water pipe 20a and cooling water pipe 2
0b, the cooling water pipe 20c, and the cooling water pipe 20d join at the outflow sides E, F, and G, and are connected to the circulation pump 7 as the return water cooling pipe 20B, and are connected to the inflow side H of the heat exchanger 8. ing.

FIG. 2 is an axial sectional view of the heat exchanger 16,
FIG. 3 is a sectional view taken along the line AA in FIG.

The illustrated heat exchanger 16 has a ring-shaped inlet ring pipe 11 provided on the upstream side so as to surround the outer periphery of the penstock 1 and has substantially the same shape as the inlet ring pipe 11 and has a downstream corresponding to the inlet ring pipe 11. An outlet ring pipe 13 is provided on the side, and the inlet ring pipe 11 and the outlet ring pipe 13 communicate with each other by a number of thin cooling pipes 12 arranged in parallel in the penstock 1. Further, the inlet ring pipe 11 and the main cooling pipe 12a are connected by arranging a valve 14. As is clear from FIGS. 2 and 3, a plurality of cooling tubes 12 are arranged in parallel with the flowing direction so as to minimize resistance to flowing water flowing through the penstock 1.

In the above configuration, first, the generator upper bearing 3a
The lubricating oil whose temperature has increased due to the bearing frictional heat is exchanged by the circulating cooling water flowing through the cooling water pipe 20a. The air whose temperature has risen by cooling the generator windings (not shown) is exchanged with the circulating cooling water flowing through the cooling water pipe 20 b by the generator air cooling pipe 4. Also, the generator lower bearing 3
The lubricating oil whose temperature has increased due to the frictional heat of the bearing b is exchanged with the circulating cooling water flowing through the cooling water pipe 20c.

Further, the lubricating oil whose temperature has increased due to bearing frictional heat of the water turbine bearing 5a exchanges heat with the circulating cooling water flowing through the cooling water pipe 20d.

The circulating cooling water whose temperature has been increased by the above-described coolers of the generator upper bearing 3a, the generator lower bearing 3b, the water wheel bearing 5a and the generator air cooling pipe 4 merges and flows into the cooling water pipe 20B. Furthermore, it flows into the heat exchanger 16 provided in the penstock 1 by suction of the circulation pump 7.

In the heat exchanger 16, first, the circulating cooling water whose temperature has risen flows into the inlet ring pipe 11 shown in FIGS. 2 and 3, and further flows into the main cooling pipe 12 a via the valve 14 to cool the cooling water. It flows in a meandering manner in the tube 12. As a result, heat is exchanged between the power generation water 30 as primary cooling water flowing inside the penstock 1 and the circulating cooling water flowing in the cooling pipe 12, and the circulating cooling water whose temperature has increased is cooled. The circulating cooling water that has been cooled to a low temperature is collected in the outlet ring pipe 13 and flows out and circulates to the cooling water pipe 20A by the discharge force of the circulating pump 7.

FIG. 4 is a block diagram of a closed circulation type cooling apparatus showing a second embodiment of the present invention. In FIG. 4, the same symbols as those in FIG. 1 showing the first embodiment denote the same parts or parts. The corresponding part is shown.

In the second embodiment of the present invention, the heat exchanger 16
A is provided in a casing downstream of the inlet valve 2 to exchange heat between the circulating cooling water and the power generation water 30 flowing in the casing, thereby cooling the circulating cooling water.

A heat exchanger 16A is arranged in a casing 19 downstream of the inlet valve 2. And the heat exchanger 16
A is provided with a cooling water pipe 20A on the outflow side A, and the cooling water pipe 20A is branched to a cooling water pipe 20a by a branch portion B, and the cooling water pipe 20a is connected to a cooler (not shown) of the generator upper bearing 3a. Connected.

The cooling water pipe 20A is branched by a branch C into a cooling water pipe 20b and connected to the generator air cooling pipe 4. The cooling water pipe 20A is branched into a cooling water pipe 20c and a cooling water pipe 20d by a branch portion D, and the cooling water pipe 20c is connected to a cooler (not shown) of the generator lower bearing 3b. 20d is a water turbine bearing 5
a is connected to a cooler (not shown).

The above-mentioned cooling water pipe 20a and cooling water pipe 2
0b, the cooling water pipe 20c, and the cooling water pipe 20d are joined at the outflow sides E, F, and G, connected to the circulation pump 7 as the cooling water pipe 20B, and connected to the inflow side H of the heat exchanger 16A. .

The heat exchanger 16A is the same as the heat exchanger 16 shown in FIGS.

In the above configuration, first, the generator upper bearing 3a
The lubricating oil whose temperature has increased due to the bearing frictional heat is exchanged by the circulating cooling water flowing through the cooling water pipe 20a. The air whose temperature has risen by cooling the generator windings (not shown) is exchanged with the circulating cooling water flowing through the cooling water pipe 20 b by the generator air cooling pipe 4. Also, the generator lower bearing 3
The lubricating oil whose temperature has increased due to the frictional heat of the bearing b is exchanged with the circulating cooling water flowing through the cooling water pipe 20c.

Further, the lubricating oil whose temperature has increased due to bearing frictional heat of the water wheel bearing 5a exchanges heat with the circulating cooling water flowing through the cooling water pipe 20d.

The circulating cooling water whose temperature has been increased by the above-described coolers of the generator upper bearing 3a, the generator lower bearing 3b, the water wheel bearing 5a and the generator air cooling pipe 4 merges and flows into the cooling water pipe 20B. Furthermore, it flows into the heat exchanger 16A provided in the penstock 1 by suction of the circulation pump 7.

In the heat exchanger 16A, first, FIGS.
As shown in the figure, the circulating cooling water whose temperature has risen flows into the inlet ring pipe 11 and further flows through the valve 14 into the main cooling pipe 1.
It flows into the cooling pipe 12 in a meandering manner. As a result, heat is exchanged between the power generation water 30 as primary cooling water flowing inside the penstock 1 and the circulating cooling water flowing in the cooling pipe 12, and the circulating cooling water whose temperature has increased is cooled. The circulating cooling water that has been cooled to a low temperature is collected in the outlet ring pipe 13 and flows out and circulates to the cooling water pipe 20A by the discharge force of the circulating pump 7.

FIG. 5 is a block diagram of a closed-circulation cooling apparatus showing a third embodiment of the present invention. In FIG. 5, the same reference numerals as those of FIG. 1 showing the first embodiment denote the same parts or parts. The corresponding part is shown.

In the third embodiment of the present invention, the heat exchanger 16
B is installed in the penstock 1 and the heat exchanger 16C is installed in the casing 19 on the downstream side of the inlet valve, so that heat is exchanged between the circulating cooling water and the power generation water 30 flowing in the penstock 1, and furthermore, the circulating cooling is performed. The circulating cooling water is cooled by heat exchange between the water and the power generation water 30 flowing in the casing.

At the end of the penstock 1, a heat exchanger 16B is arranged. Further, the heat exchanger 16C is disposed in the casing 19, and the circulating cooling water system on the outflow side of the heat exchanger 16B is connected to the circulating cooling water system on the inflow side of the heat exchanger 16C.

In the heat exchanger 16C, a cooling water pipe 20A is provided on the outflow side A, and the cooling water pipe 20A is connected to the branch B
The cooling water pipe 20a branches into the cooling water pipe 20a.
Is connected to a cooler (not shown) of the generator upper bearing 3a. The cooling water pipe 20A is branched by a branch part C into a cooling water pipe 20b and connected to the generator air cooling pipe 4. The cooling water pipe 20A is branched into a cooling water pipe 20c and a cooling water pipe 20d by a branch portion D, and the cooling water pipe 20c is connected to a cooler (not shown) of the generator lower bearing 3b. Reference numeral 20d is connected to a not-shown cooler of the water turbine bearing 5a.

The above-mentioned cooling water pipe 20a and cooling water pipe 2
The cooling water pipe 20c, the cooling water pipe 20c, and the cooling water pipe 20d are joined at the outflow sides E, F, and G, connected to the circulation pump 7 as the cooling water pipe 20B, and connected to the inflow side H of the heat exchanger 16B. .

In the above configuration, first, the generator upper bearing 3a
The lubricating oil whose temperature has increased due to the bearing frictional heat is exchanged by the circulating cooling water flowing through the cooling water pipe 20a. The air whose temperature has risen by cooling the generator windings (not shown) is exchanged with the circulating cooling water flowing through the cooling water pipe 20 b by the generator air cooling pipe 4. Also, the generator lower bearing 3
The lubricating oil whose temperature has increased due to the frictional heat of the bearing b is exchanged with the circulating cooling water flowing through the cooling water pipe 20c. Further, the lubricating oil whose temperature has increased due to bearing frictional heat of the water turbine bearing 5a exchanges heat with the circulating cooling water flowing through the cooling water pipe 20d.

The circulating cooling water whose temperature has been raised by the above-described coolers of the generator upper bearing 3a, the generator lower bearing 3b, the water turbine bearing 5a and the generator air cooling pipe 4 merges and flows into the cooling water pipe 20, Furthermore, it flows into the heat exchanger 16B provided in the penstock 1 by suction of the circulation pump 7.

In the heat exchanger 16B, first, FIGS.
The circulating cooling water whose temperature has increased flows into the inlet ring pipe 11 shown in FIG. As a result, heat is exchanged between the power generation water 30 as primary cooling water flowing inside the penstock 1 and the circulating cooling water flowing in the cooling pipe 12, and the circulating cooling water whose temperature has increased is cooled.
The cooled circulating cooling water having a low temperature is collected in the outlet ring pipe 13, further flows into the heat exchanger 16C through the connecting pipe 15, and is further subjected to heat exchange, and the cooled circulating cooling water having the low temperature is cooled. It flows out and circulates to the cooling water pipe 20A by the discharge force of the circulation pump 7.

FIG. 6 is a block diagram of a closed circulation type cooling apparatus according to a fourth embodiment of the present invention. In FIG. 6, the same symbols as those in FIG. 1 showing the first embodiment denote the same parts or parts. The corresponding part is shown.

The difference between the fourth embodiment of the present invention and the first embodiment is that oil is used instead of water as a cooling medium for a closed circulation type cooling device. In the fourth embodiment, the heat exchanger 17 is mounted on the penstock 1 and heat exchanges with the circulating lubricating oil and the power generation water 30 flowing in the penstock 1 to cool the circulating lubricating oil.

At the end of the penstock 1, a heat exchanger 17 to be described later is arranged. This heat exchanger 17 is connected to the outlet A
A lubricating oil pipe 21A is disposed as a cooling medium pipe, and the lubricating oil pipe 21A is branched to a lubricating oil pipe 21a by a branch portion B, and the lubricating oil pipe 21a is connected to a cooler (not shown) of the generator upper bearing 3a. are doing.

The lubricating oil pipe 21A is branched into a lubricating oil pipe 21b by a branch portion C, and the generator lower bearing 3b
And a lubricating oil pipe 21d
Is connected to a not-shown cooler of the water turbine bearing 5a.

The above-described lubricating oil pipe 21a and the lubricating oil pipe 2
1b and the lubricating oil pipe 21c are joined at the outflow sides F and G, connected to the circulation pump 7 as the lubricating oil pipe 21B, and connected to the inflow side H of the heat exchanger 17.

The heat exchanger 17 has the same configuration as that shown in FIGS.

In the above configuration, first, the generator upper bearing 3a
The lubricating oil whose temperature has risen due to the bearing frictional heat is exchanged with the circulating lubricating oil flowing through the lubricating oil pipe 21a. Further, the lubricating oil whose temperature has increased due to bearing frictional heat of the generator lower bearing 3b is exchanged with the circulating lubricating oil flowing through the lubricating oil pipe 21b. Further, the lubricating oil whose temperature has risen due to bearing frictional heat of the water turbine bearing 5a is exchanged with the circulating lubricating oil flowing through the lubricating oil pipe 21c.

The circulating lubricating oil whose temperature has been raised by the coolers of the generator upper bearing 3a, the generator lower bearing 3b, and the water wheel bearing 5a merges and flows into the lubricating oil pipe 21B. Flows into the heat exchanger 17 provided in the penstock 1.

In the heat exchanger 17, first, the circulating lubricating oil whose temperature has risen flows into the inlet ring pipe 11 similar to that shown in FIG. 2 and FIG.
a, and flows so as to meander inside the cooling pipe 12.
As a result, heat is exchanged between the power generation water 30 as primary cooling water flowing inside the penstock 1 and the circulating lubricating oil flowing through the cooling pipe 12, and the circulating lubricating oil whose temperature has increased is cooled. The cooled lubricating oil having a low temperature is collected in the outlet ring pipe 13 and flows out and circulates to the lubricating oil pipe 21A by the discharge force of the circulation pump 7.

FIG. 7 is a block diagram of a closed circulation type cooling apparatus showing a fifth embodiment of the present invention. In FIG. 7, the same symbols as those in FIG. 1 showing the first embodiment denote the same parts or parts. The corresponding part is shown.

The fifth embodiment of the present invention relates to a heat exchanger 17
A is provided in the casing 19 on the downstream side of the inlet valve 2 so that the circulating lubricating oil is cooled by heat exchange between the circulating lubricating oil and the power generation water 30 flowing in the casing 19.

The casing 19 is provided with a heat exchanger 17A. In the heat exchanger 17A, a lubricating oil pipe 21A is disposed on the outflow side A, and the lubricating oil pipe 21A is branched by a branch portion B into a lubricating oil pipe 21a.
a is connected to a cooler (not shown) of the generator upper bearing 3a.

Further, the lubricating oil pipe 21A is branched into a lubricating oil pipe 21b by a branch portion C, and the lower generator bearing 3b
And a lubricating oil pipe 21c.
Is connected to a not-shown cooler of the water turbine bearing 5a.

The above described lubricating oil pipe 21a and lubricating oil pipe 2
1b and the lubricating oil pipe 21c join at the outflow sides D and F, are connected to the circulation pump 7 as the lubricating oil pipe 21B, and are connected to the inflow side H of the heat exchanger 17A.

In the above configuration, first, the generator upper bearing 3a
The lubricating oil whose temperature has risen due to the bearing frictional heat is exchanged with the circulating lubricating oil flowing through the lubricating oil pipe 21a. Further, the lubricating oil whose temperature has increased due to bearing frictional heat of the generator lower bearing 3b is exchanged with the circulating lubricating oil flowing through the lubricating oil pipe 21b. Further, the lubricating oil whose temperature has risen due to bearing frictional heat of the water turbine bearing 5a is exchanged with the circulating lubricating oil flowing through the lubricating oil pipe 21c.

The circulating lubricating oil whose temperature has been raised by the coolers of the generator upper bearing 3a, the generator lower bearing 3b, and the water wheel bearing 5a merges and flows into the lubricating oil pipe 21B. Flows into the heat exchanger 17 </ b> A provided in the casing 19.

In the heat exchanger 17A, first, FIGS.
The circulating lubricating oil whose temperature has risen flows into the same inlet ring pipe 11 as shown in FIG.
It flows into the cooling pipe 12 in a meandering manner. Thereby, heat is exchanged between the power generation water 30 as primary cooling water flowing inside the casing 19 and the circulating lubricating oil flowing in the cooling pipe 12, and the circulating lubricating oil whose temperature has increased is cooled. The cooled lubricating oil having a low temperature is collected in the outlet ring pipe 13 and flows out and circulates to the lubricating oil pipe 21A by the discharge force of the circulation pump 7.

FIG. 8 is a block diagram of a closed circulation type cooling apparatus showing a sixth embodiment of the present invention. In FIG. 8, the same symbols as those in FIG. 1 showing the first embodiment denote the same parts or parts. The corresponding part is shown.

In the sixth embodiment of the present invention, the heat exchanger 17
B is mounted on the penstock 1 and the heat exchanger 17C is mounted on the casing 19 on the downstream side of the inlet valve 2 so that the heat exchanger 1
7B, the heat exchanger 17C, and the connecting pipe 15 to connect the circulating lubricating oil, the penstock 1 and the power generation water 30 flowing in the casing.
The cooling lubricating oil is cooled by heat exchange with the lubricating oil.

At the end of the penstock 1, a heat exchanger 17B is arranged. Further, the heat exchanger 1 is
7C is equipped. The heat exchanger 17C has a lubricating oil pipe 21A disposed on the outflow side A, and a lubricating oil pipe 21A.
Is branched to a lubricating oil pipe 21a by a branch portion B, and the lubricating oil pipe 21a is connected to a cooler (not shown) of the upper generator bearing 3a.

The lubricating oil pipe 21A is branched into a lubricating oil pipe 21b by a branch portion C, and the lower generator bearing 3b
And a lubricating oil pipe 21c.
Is connected to a not-shown cooler of the water turbine bearing 5a.

The lubricating oil pipe 21a and the lubricating oil pipe 2 described above
1b and the lubricating oil pipe 21c are joined at the outflow sides D and F, connected to the circulation pump 7 as the lubricating oil pipe 21B, and connected to the inflow side H of the heat exchanger 17B.

In the above configuration, first, the generator upper bearing 3a
The lubricating oil whose temperature has risen due to the bearing frictional heat is exchanged with the circulating lubricating oil flowing through the lubricating oil pipe 21a. Further, the lubricating oil whose temperature has increased due to bearing frictional heat of the generator lower bearing 3b is exchanged with the circulating lubricating oil flowing through the lubricating oil pipe 21b. Further, the lubricating oil whose temperature has risen due to bearing frictional heat of the water turbine bearing 5a is exchanged with the circulating lubricating oil flowing through the lubricating oil pipe 21c.

The circulating lubricating oil whose temperature has been raised by the coolers of the generator upper bearing 3a, the generator lower bearing 3b, and the water wheel bearing 5a merges and flows into the lubricating oil pipe 21B. Flows into the heat exchanger 17B provided in the penstock 1.

In the heat exchanger 17B, first, FIGS.
The circulating lubricating oil whose temperature has risen flows into the same inlet ring pipe 11 as shown in FIG.
It flows into the cooling pipe 12 in a meandering manner. As a result, heat is exchanged between the power generation water 30 as primary cooling water flowing inside the penstock 1 and the circulating lubricating oil flowing through the cooling pipe 12, and the circulating lubricating oil whose temperature has increased is cooled. The cooled lubricating oil having a low temperature is collected in the outlet ring pipe 13, further flows into the heat exchanger 17 </ b> C through the connecting pipe 15, is further heat-exchanged, and then is discharged by the discharge force of the circulating pump 7. Piping 21A
And circulated.

[0072]

As described above, according to the first aspect of the present invention, heat is directly exchanged between the circulating cooling medium and the power generation water flowing in the hydraulic pipeline to cool the circulating cooling water. A primary cooling water feed pump, a primary cooling water strainer, a primary cooling water pipe, and the like are not required on the cooling water system on the side, and the cooling effect is improved. Therefore, the device as a whole is simplified and has excellent maintenance and reliability.

According to the second aspect of the present invention, heat is directly exchanged between the circulating cooling medium and the power generation water flowing through the penstock to cool the circulating cooling medium. The primary cooling water feed pump, the primary cooling water strainer, and the primary cooling water piping are not required, and the cooling effect is improved.

According to the third aspect of the present invention, the first aspect
In addition to the effects of the invention, the heat exchanger is provided on both the penstock and the casing, so that the heat exchanger according to the second aspect cannot be installed on the penstock or the casing under installation conditions such as dimensions. In this case, the heat exchangers can be separately arranged on both the penstock and the casing, and the cooling effect can be equal to or greater than that of the second aspect of the invention.

Further, according to the invention of claim 4, a large number of cooling pipes are arranged in the penstock or the casing to exchange heat with the water for power generation flowing in the penstock or the casing. Therefore, the cooling effect of the circulating cooling medium can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a closed-circulation cooling device for a rotary machine according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a heat exchanger provided in the closed circulation type cooling device of the rotary machine of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a configuration diagram of a closed-circulation cooling device for a rotary machine according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a closed-circulation cooling device for a rotary machine, showing a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a closed-circulation cooling device for a rotary machine according to a fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of a closed-circulation cooling device for a rotary machine according to a fifth embodiment of the present invention.

FIG. 8 is a configuration diagram of a closed-circulation cooling device for a rotary machine according to a sixth embodiment of the present invention.

FIG. 9 is a configuration diagram of a conventional closed-circulation cooling device for a rotary machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Penstock 2 Inlet valve 3 Generator 3a Generator upper bearing 3b Generator lower bearing 4 Generator air cooling pipe 5 Water turbine room 5a Turbine bearing 6 Suction pipe 7 Circulation pump 8, 16, 17 Heat exchanger 9 Primary cooling water supply Pump 10 Primary cooling water strainer 11 Inlet ring pipe 12 Cooling pipe 12a Main cooling pipe 13 Outlet ring pipe 14 Valve 15 Connection pipe 19 Casing 20 Cooling water pipe 21 Lubricating oil pipe

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satoshi Ono 66-2 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa F-term in Toshiba Engineering Co., Ltd. 3H072 AA02 BB12 CC10 CC11 CC72 CC83

Claims (4)

[Claims] 1. A rotating machine provided in a power plant that introduces water for power generation from an upstream side through a hydraulic line into a water turbine room, or pumps water from a downstream water discharge channel or the like to an upstream side through a water turbine room and a hydraulic line. Closed circulation type of rotating machine that cools each part of rotating machine by supplying cooling medium from closed closed cooling medium system to various cooling machines such as bearing lubricating oil cooler or rotating machine air cooler In the cooling device, a heat exchanger is provided in the hydraulic line so that heat is exchanged between the circulating cooling medium flowing in the closed circulating cooling medium system and the power generation water flowing in the hydraulic line. A closed circulation type cooling device for a rotary machine, characterized by cooling a cooling machine. 2. The heat exchanger is mounted on a penstock located upstream of an inlet valve of the hydraulic line so as to exchange heat between power generation water flowing in the penstock of the hydraulic line and the circulating cooling medium. Cooling the circulating cooling medium, or the heat exchanger in the casing so as to exchange heat between the circulating cooling medium and power generation water flowing in a casing provided downstream of the inlet valve of the hydraulic line. The closed-circulation cooling device for a rotary machine according to claim 1, wherein the cooling device is provided to cool the circulating cooling medium. 3. The heat exchanger is provided with a first heat exchanger on a penstock upstream of an inlet valve so as to exchange heat between power generation water flowing in the penstock and the circulating cooling medium. A second heat exchanger is provided in a casing downstream of the inlet valve so as to exchange heat between the power generation water flowing in a casing provided downstream of the inlet valve and the circulating cooling medium, and the first heat exchange is performed. 2. The rotating cooling medium according to claim 1, wherein a circulating cooling medium pipe of the heat exchanger and the second heat exchanger is connected in series so as to form the circulating cooling medium system to cool the circulating cooling medium. Closed circulation cooling system for the machine. 4. The heat exchanger, or the first heat exchanger and the second heat exchanger, may be a penstock or an inlet ring pipe for introducing a circulating cooling medium provided to surround an outer periphery of a casing. An outlet ring pipe is provided which is substantially the same shape as the inlet ring pipe and is provided in correspondence with the inlet ring pipe, and which leads out a circulating cooling medium, communicates between the inlet ring pipe and the outlet ring pipe, and In the iron pipe, or, having a large number of cooling pipes disposed in parallel with the inflow of power generation water in the casing, heat exchange with the power generation water flowing in the penstock, or in the casing, The closed-circulation cooling device for a rotary machine according to any one of claims 1 to 3, wherein the circulating cooling medium in the cooling pipe is cooled.