JP2000179444A - Bearing cooling device for vertical axis type rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing cooling device for a vertical axis type rotary electric machine with an easy maintenance and inspection. SOLUTION: The bearing cooling device 1 is provided with a cooler 11; an electromotive fan 12; and a lubricant circulation system 92. The cooler 11 is retained on an upper bracket 49 of a vertical axis type synchronizing generator 8 and the electromotive fan 12 is fixed to the cooler 11 at an inflow side of a cooling air 19. The cooler 11 is a liquid/gas type heat exchanger, the liquid is a lubricant 48 and the gas is the cooling air 19 fed by the electromotive fan 12. Accordingly, in the bearing cooling device 1, an installment of a water- cooling type heat-removal system as in a conventional device is not required. After the cooling air 19 eliminates heat from the cooler 11, it is taken from an opening 78 in the inside of the vertical axis type synchronizing generator 8 with a cooling air 89 and is also used for cooling the generator 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cooling lubricating oil used for lubricating a bearing for supporting a rotating system of a vertical shaft type rotating electric machine, and its structure is intended to simplify maintenance and the like. About.

[0002]

2. Description of the Related Art A vertical shaft type rotating electric machine used in a hydroelectric power plant generally includes a main bearing in which a thrust bearing and a guide bearing are combined to support a rotating system such as a rotor and a rotating shaft. A bearing cooling device is provided for cooling the main bearing. The bearing cooling device includes a lubricating oil circulation system for circulating lubricating oil for lubricating the main bearing, and a cooler for removing lost heat generated in the main bearing and carried by the lubricating oil. In a vertical electric rotating machine having a relatively small capacity (for example, about 20,000 kVA or less), cooling is performed by using cooling air obtained by a self-ventilating fan attached to a rotor or the like. For medium and large-capacity vertical rotating electric machines with capacity exceeding that of small capacity machines,
Water that is readily available at hydropower plants is ultimately used.

A conventional bearing cooling device for a vertical shaft type rotary electric machine using water for final heat removal from a cooler will be described below with reference to FIG. Here, FIG.
FIG. 2 is a side view showing a main part of a conventional bearing cooling device for a vertical shaft type rotating electric machine together with related devices. In FIG. 3, as a related device of the bearing cooling device, a main part of a vertical shaft type rotating electric machine is shown as a half-cut vertical sectional view, and a straight line indicated by a dashed line in FIG. X
-X. In FIGS. 1 and 2 to be described later, the display method of the related devices is the same as that in FIG. 3, reference numeral 8 denotes a stator 7, a stator frame 79, an exhaust wind tunnel 77, a rotor 6, and an upper-side self-blowing fan 69.
, A lower self-blowing fan 68, a rotary shaft 5, an upper bearing 4, and an upper bracket 49 (a vertical shaft type rotary electric machine in this case).
Reference numeral 88 denotes a base on which the vertical synchronous generator 8 and the like are installed.

[0004] The stator 7 has a stator core 71 formed in a cylindrical shape having a circular inner peripheral surface, and a stator winding loaded in a plurality of coil slots (not shown) formed in the stator core 71. It is mainly composed of the line 72. The stator frame 79 is a structure for holding the stator 7, the upper bracket 49, and the like and mounting the same on the foundation 88.
In 9, a flow path of cooling air 89 which is obtained by the upper self-blowing fan 69 and the lower self-blowing fan 68 and cools the stator 7 and the rotor 6 is formed. The exhaust wind tunnel 77 is connected to the stator frame 79, is formed in an outer shape such as a circular shape or a polygonal shape, and allows the cooling air 89 flowing out from the flow passage of the stator frame 79 to flow. Forming a path.

The rotor 6 has an even number of convex magnetic poles 63,
The magnetic poles 63 are magnetically and mechanically connected to each other on the anti-stator 7 side, and a rim portion 61 mounted on the rotating shaft 5, a rotor winding 62 wound around each magnetic pole 63.
And Each of the plurality of salient poles 63 is formed by laminating a large number of iron plates made of thin plates, and the surface connecting the tops of all the poles 63 forms a circular surface,
This circular surface is also a circular outer peripheral surface of the rotor 6. This outer peripheral surface is set concentric with the inner peripheral surface of the stator core 71, and a gap is formed between the outer peripheral surface of the rotor 6 and the inner peripheral surface of the stator core 71. . It is known that a large-capacity vertical shaft rotary electric machine includes a rotor center between the rim portion 61 and the rotating shaft 5 for coupling the rim portion 61 to the rotating shaft 5.

In this case, both the upper self-blowing fan 69 and the lower self-blowing fan 68 have an impeller section having a plurality of blades formed by a radial fan and an impeller section on the side of the rotor 6. Mounting support and stator frame 79
The fan is a radial type fan having a fan shield attached to, for example, a fan shield, and generates cooling air 89 when the rotor 6 rotates. The cooling air 89 is supplied to the stator frame 79
Is taken into the inside of the vertical shaft type synchronous generator 8 through an opening 78 formed at the upper portion of the vertical shaft type. The upper bearing portion 4 is a main bearing in this case having a thrust bearing 41 and a guide bearing 42, and an upper bracket 49 holds the thrust bearing 41 and the guide bearing 42 and is used for lubrication of the upper bearing portion 4. The lubricating oil 48 is also held in a stator frame 79 and also serves as an oil tank. The rotating shaft 5 has an upper portion rotatably supported by an upper bearing portion 4, and a lower portion rotatably guided by a lower bearing portion (not shown) and is arranged vertically. The rotating shaft 5 is provided at an intermediate portion between the upper bearing portion 4 and the lower bearing portion. Rotor 6
Is installed.

[0007] Further, 9 is a cooler 91 and an oil return pipe 9
3, a conventional bearing cooling device provided with a lubricating oil circulation system 92 having an oil supply pipe 94 and a water-cooled heat removal system (not shown). In this case, the cooler 91 is installed on a foundation 88. Have been. The lubricating oil 48 circulates between the upper bearing section 4 and the cooler 91 via an oil supply pipe 94 and an oil return pipe 93 to lubricate the upper bearing section 4 and to reduce heat loss generated in the upper bearing section 4. It serves to remove it from the upper bearing 4. The cooler 91 is a kind of liquid-liquid type heat exchanger. One of the liquids is a lubricating oil 48, and the other liquid is a cooling liquid such as water or oil (different from the lubricating oil 48). is there.

A typical configuration of the water-cooled heat removal system includes a water-cooled radiator and a cooling passage having a closed path for circulating a cooling liquid between the water-cooled radiator and the cooler 91. A type having a liquid circulation system and a type using a part of water for driving a water turbine installed in a hydroelectric power plant as a cooling liquid are known. In the former,
The water-cooled radiator uses the water intake and drainage yard of the hydroelectric power plant as the heat radiation destination.In the latter case, the cooling water flow path removes dust from the water supply pump and cooling water. Generally, a strainer or the like is installed. Thus, both use water that is easily available at the hydroelectric power station as a destination of the loss heat generated in the upper bearing portion 4.

[0009]

The bearing cooling device 9 for a vertical shaft type rotating electric machine according to the prior art described above is configured as described above, and has a cooling capacity as a destination of the loss heat generated in the upper bearing portion 4. Since the water with a high capacity is used, the heat loss generated in the upper bearing portion 4 due to its large capacity is large, so that even a medium-capacity and large-capacity vertical shaft type rotary electric machine has sufficient upper bearing portion 4. Can be cooled.
However, in recent years, the following has become a problem, and a solution to it has been desired.

[0010] Among the water-cooling type heat removal systems of the conventional bearing cooling device 9, those having a water-cooling radiator require installation of a cooling liquid circulation system for circulating a cooling liquid. As a result, the manufacturing cost becomes high, and maintenance and inspection work for removing foreign matters such as leaves and algae attached to the water-cooled radiator is required. Further, it may be necessary to consider the occurrence of breakage of the water-cooled radiator caused by large foreign matters such as driftwood. In the case of using a part of the water for the water turbine drive source for cooling the cooler 91, the production cost is high due to the necessity of constructing a complicated cooling water passage. At the same time, an operation related to removal and cleaning of dust and the like accumulated on the strainer is indispensable. That is, in the conventional bearing cooling device 9, regardless of the type of the water-cooled heat removal system provided, the manufacturing cost is expensive and the maintenance / inspection relating to the maintenance / management of the cooling performance for the upper bearing portion 4 is performed. Requires a lot of work time.

As described above, in a relatively small-capacity vertical shaft type rotary electric machine, heat is removed from a cooler by using cooling air obtained by a self-ventilating fan. There is no problem due to. However,
The use of an air-cooled cooler with self-ventilated cooling air 89 generated by the upper self-blowing fan 69 for medium- and large-capacity vertical rotating electric machines causes the following new problems. Is difficult to adopt. In other words, in the medium-capacity and large-capacity vertical rotary electric machine 8 in which the heat loss generated from the upper bearing portion 4 is large, the rotor 6 and the stator 7 remove heat from the cooler to increase the temperature. Since it is cooled by the cooling air 89, the life of the electrical insulating material used for the winding portion is adversely affected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a bearing cooling device for a vertical rotating electric machine which can be easily maintained and inspected.

[0013]

According to the present invention, there are provided the following objects: 1) a cooler used for cooling lubricating oil of a bearing for supporting a rotating shaft, and a lubricating oil circulation system for circulating the lubricating oil. In a bearing cooling device for a vertical shaft type rotating electric machine having a motor, an electric blower is used for heat removal of the cooler, and heat is removed from the cooler by cooling air supplied from the electric blower. Or 2) In the means described in the above item 1, it is achieved by providing a structure including an exhaust pipe for removing heat of the cooler and discharging the cooling air whose temperature has increased.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description, the same parts as those of the conventional bearing cooling device for a vertical shaft type rotating electric machine shown in FIG. Is omitted.
In addition, in the drawings used in the following description, only the reference numerals shown in FIG. 3 are represented as much as possible.

FIG. 1 is a side view showing a bearing cooling device for a vertical rotating electric machine according to an embodiment of the present invention, together with related devices. In FIG. 1, 1 is a cooler 11
, An electric blower 12 and a lubricating oil circulation system 92. In this case, the cooler 11 is held by the upper bracket 49, and the electric blower 12 is Is fixed to the air inflow side. The cooler 11 is a kind of liquid / gas type heat exchanger, in which the liquid is the lubricating oil 48 and the gas is the cooling air 19 supplied by the electric blower 12. Therefore, in the bearing cooling device 1, the installation of the conventional water-cooled heat removal system is unnecessary. After the cooling air 19 is removed from the cooler 11, it is taken into the vertical shaft type synchronous generator 8 through the opening 78 together with the cooling air 89. Then the cooling air 1
9 is sufficiently supplied so that the temperature rise value after removing a large amount of heat loss generated from the upper bearing portion 4 becomes a low value that does not hinder the cooling of the rotor 6 and the stator 7. Is set to an appropriate amount.

In the bearing cooling device 1 for a vertical rotating electric machine according to an embodiment of the present invention shown in FIG. 1, the electric blower 12 is employed as described above, and the above-mentioned required supply amount of the cooling air 19 is reduced. The power is supplied by the electric blower 12. As described above, in the vertical rotating electric machine for a hydroelectric power plant according to the prior art, the upper bearing portion 4 is cooled by using self-ventilation which can use the rotating operation of the vertical rotating electric machine, or has a high cooling capacity and is available. It is common knowledge that cooling with water is extremely easy, and no other cooling method has been considered. The inventor employs the electric blower 12 which can arbitrarily set the air supply amount by piercing the blind spot, and supplies the above-mentioned required supply amount of the cooling air 19 by the electric blower 12, thereby obtaining the water-cooled heat removal according to the conventional example. The system can be eliminated, and the life of the electrical insulating material used for the windings of the rotor 6 and the stator 7 is not adversely affected. In addition, since the water-cooled heat removal system can be eliminated, the manufacturing cost of the water-cooled heat removal system and the time required for maintenance and inspection of the water-cooled heat removal system can be eliminated.

Next, a bearing cooling device for a vertical shaft type rotating electric machine according to a different embodiment of the present invention will be described with reference to FIG. Here, FIG. 2 is a side view showing a bearing cooling device for a vertical rotating electric machine according to a different example of the embodiment of the present invention, together with related devices. In FIG. 2, the same parts as those of the bearing cooling device for a vertical shaft type rotary electric machine according to the embodiment of the present invention shown in FIG. In FIG. 2, 2
Is a cooler 11, an electric blower 12, a lubricating oil circulation system 9
2, an exhaust pipe 21, and a cooler mounting base 22.

In this case, the electric blower 12 is
The cooling air 19 is fixed to the cooler 11 on the discharge side, the exhaust pipe 21 is connected between the electric blower 12 and the outside of the power plant, and the mount 22 for the cooler is mounted on a vertical shaft type synchronous. The generator 8 is attached to the outer surface of the exhaust wind tunnel 77. Reference numeral 29 denotes a power plant outer wall. Bearing cooling device 2
After the heat of the cooler 11 is removed, the cooling air 19 flows through the exhaust pipe 21 and is discharged outside the power plant. For this reason, in this case, the supply amount of the cooling air 19 depends on the amount of the heat loss 1 generated from the upper bearing portion 4 of the cooler 1.
1 can be set by taking only the heat removal into consideration, and there is no need to consider cooling of the rotor 6 and the stator 7. In this case, cooling of the rotor 6 and the stator 7 of the vertical shaft type synchronous generator 8 is performed by the cooling air 89 as in the conventional example.

Since the bearing cooling device 2 for a vertical shaft type rotary electric machine according to a different embodiment of the present invention shown in FIG. 2 has the above-described configuration, the bearing cooling device 1 according to the present invention is a water-cooled type according to a conventional example. The temperature rise of the cooling air 19 can be set higher than in the case of the bearing cooling device 1 while maintaining the advantages of the heat removal system as it is,
The cooler 11 can be made relatively small. Therefore, the bearing cooling device 2 can be suitably applied to the vertical rotating electric machine 8 and the like in which the heat loss generated in the upper bearing portion 4 is particularly large.

[0020]

The bearing cooling device for a vertical shaft type rotating electric machine according to the present invention has the following effects by adopting the structure described in the section of the means for solving the above problems.

By adopting the configuration according to the first aspect of the invention, the self-ventilation method can be adopted for medium-capacity and large-capacity vertical rotating electric machines. The need for a water-cooled heat removal system is eliminated. This makes it possible to eliminate the manufacturing cost of the water-cooled heat removal system and the time required for maintenance and inspection of the water-cooled heat removal system. Further, by adopting the configuration according to the item (2) of the means for solving the above problems, it is possible to relatively reduce the size of the cooler to be used while maintaining the effect according to the item.

[Brief description of the drawings]

FIG. 1 is a side view showing a bearing cooling device for a vertical rotating electric machine according to an embodiment of the present invention, together with related devices.

FIG. 2 is a side view showing a bearing cooling device for a vertical rotating electric machine according to a different embodiment of the present invention, together with related devices.

FIG. 3 is a side view showing a main part of a conventional bearing cooling device for a vertical shaft type rotating electric machine together with related devices.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing cooling device 11 Cooler 12 Electric blower 19 Cooling air 48 Lubricating oil 49 Upper bracket 78 Opening 8 Vertical synchronous generator 89 Cooling air 92 Lubricating oil circulation system

Claims (2)

[Claims] 1. A bearing cooling device for a vertical shaft type rotary electric machine, comprising: a cooler used for cooling lubricating oil of a bearing supporting a rotating shaft; and a lubricating oil circulation system for circulating the lubricating oil. A bearing cooling device for a vertical rotating electric machine, comprising: an electric blower for removing heat from a cooler; and removing heat from the cooler by cooling air supplied from the electric blower. 2. A bearing cooling device for a vertical shaft type rotating electric machine according to claim 1, further comprising an exhaust pipe for removing heat of the cooler and discharging cooling air whose temperature has increased. Bearing cooling device for vertical shaft rotating electric machines.