JP5550506B2 - Vertical axis electric machine - Google Patents

Description

  The present invention relates to a vertical axis rotating electrical machine including a rotary shaft extending in the vertical direction, a slide bearing that supports the rotary shaft, and an oil tank disposed around the slide bearing.

  In a conventional slide bearing of a typical vertical shaft motor, an oil tank for storing lubricating oil is disposed so as to surround the sliding bearing, and is configured to supply the lubricating oil to the sliding bearing. Since sliding bearings generate heat due to sliding friction, in order to discharge this heat, a water pipe is placed in the oil tank, and the cooling water passing through the water pipe is sent to the water cooler outside the oil tank. Cooling water is cooled with air (see Patent Document 1).

  Also, the lubricating oil is sent from an oil tank surrounding the slide bearing to an oil cooler arranged outside thereof through an oil pipe, and the lubricating oil is cooled by heat exchange between the lubricating oil and the cooling water. Technology is also known (see Patent Document 2).

  Furthermore, a system is also known in which water below the cooler inlet temperature is passed through a water pipe in the oil tank and discharged after cooling in the oil tank.

JP 59-6420 A JP 58-68595 A

  In the technique described in Patent Document 1 described above, the oil tank becomes large because the oil cooler and the cooling water pipe are arranged in the oil tank surrounding the slide bearing. In addition, the structure is complicated due to the arrangement of the cooling water piping.

  Moreover, in the technique described in Patent Document 2, the size of the oil tank does not increase because the oil cooler is disposed outside the oil tank, but the structure is complicated because a cooling water pipe is required.

  The present invention has been made in view of the above circumstances, and in a vertical axis rotating electrical machine including an oil tank for supplying lubricating oil to a slide bearing, the oil tank is made smaller without the need for an oil cooler in the oil tank, and The purpose is to simplify the structure and reduce the cost by eliminating the need for a cooling water pipe for cooling the lubricating oil.

In order to achieve the above object, one aspect of a vertical axis rotating electrical machine according to the present invention includes a rotating shaft rotatable around a vertical axis, a rotor fixed to the rotating shaft, A stator disposed radially opposite to the rotor on the radially outer side, and a gravity load on the rotary shaft and the rotor surrounding the radial outer periphery of the rotary shaft at an intermediate position in the axial direction of the rotary shaft A sliding bearing that rotates and supports the oil bearing, an oil tank that surrounds the sliding bearing and stores lubricating oil, an oil cooler that is disposed outside the oil tank and cools the lubricating oil, and a space between the oil tank and the oil cooler. An oil circulation pipe to communicate with, an external fan that is fixed to the rotary shaft and sends cooling air to the oil cooler, a housing that hermetically accommodates the rotor and the stator, and a vertical passage through the housing. And the lower windway Is arranged above the wind path, housing the oil cooler, accept the cooling air flowing out of the lower air passage, leading around of the oil cooler, the flow path of the cooling air around the condenser And an upper air passage that communicates the flow path of the cooling air driven by the external fan , wherein the oil circulation pipe is a lower part that communicates the lower part of the oil tank and the oil cooler An oil circulation pipe and an upper oil circulation pipe connected to the oil tank and connected to the oil cooler above the lower oil circulation pipe, and the lubricating oil in the oil tank is obtained by natural convection so that the upper oil It is configured to flow to the oil cooler through a circulation pipe and to return to the oil tank through the lower oil circulation pipe .
Further, another aspect of the vertical axis rotating electrical machine according to the present invention includes a rotating shaft rotatable around a vertical axis, a rotor fixed to the rotating shaft, and a radially outer side of the rotor. A stator disposed in a radial direction opposite to the rotor, and a rotational load of the rotary shaft and the rotor are supported by surrounding the radial outer periphery of the rotary shaft at an intermediate position in the axial direction of the rotary shaft. A sliding bearing; an oil tank that surrounds the sliding bearing and stores lubricating oil; an oil cooler that is disposed outside the oil tank to cool the lubricating oil; and an oil circulation that communicates between the oil tank and the oil cooler. Piping, an external fan that is fixed to the rotating shaft and sends cooling air to the oil cooler, a housing that hermetically accommodates the rotor and the stator, and a vertically penetrating through the housing Arranged in the lower airway and above the lower airway The oil cooler is accommodated, the cooling air flowing out from the lower air passage is received, guided around the oil cooler, and driven by the cooling air flow path around the cooler and the external fan. And an internal fan fixed to the rotary shaft in the housing, and heat from the air in the housing passes through the lower air path. After being transmitted to the outside air, the outside air is guided to the upper air passage.

  According to the present invention, in the vertical axis rotating electrical machine provided with the oil tank for supplying the lubricating oil to the slide bearing, the oil tank can be made small because the oil cooler in the oil tank is unnecessary, and further, the lubricating oil is cooled. Since a cooling water pipe is unnecessary, the structure can be simplified and the cost can be reduced.

1 is a schematic sectional elevation view of an embodiment of a vertical axis rotating electrical machine according to the present invention.

  Hereinafter, an embodiment of a vertical axis rotating electrical machine according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic vertical sectional view of an embodiment of a vertical axis rotating electrical machine according to the present invention.

  The vertical-axis rotating electrical machine of this embodiment is, for example, a fully-closed cage electric motor, and a rotating shaft (shaft) 10 rotates around a vertical axis. A rotor 11 is fixed around the rotating shaft 10, and a stator 12 surrounds the outer side of the rotor 11 in the radial direction. The rotor 11 and the stator 12 are accommodated in a housing 13.

  The rotating shaft 10 protrudes below the housing 13, and a lower radial bearing 14 is disposed at a portion where the rotating shaft 10 protrudes below the housing 13. The lower radial bearing 14 is, for example, a rolling bearing.

  The rotating shaft 10 also protrudes above the housing 13, and a slide bearing 15 is disposed on the outer periphery of the upper protruding portion of the rotating shaft 10. The rotary shaft 10 is supported by an axial gravity load (thrust load) by a plain bearing 15 and is also supported in the radial direction. That is, the slide bearing 15 has both the functions of a thrust bearing and an upper radial bearing.

  The outer periphery of the slide bearing 15 is surrounded by an oil tank 16 that is in contact with the entire periphery of the slide bearing 15 and stores lubricating oil.

  An oil cooler 17 is disposed outside the oil tank 16. The oil cooler 17 includes a large number of heat transfer tubes and a large number of fins provided on the outer surface of the heat transfer tubes (not shown). One end of the heat transfer pipe of the oil cooler 17 is connected to the upper oil circulation pipe 18, and the other end of the heat transfer pipe of the oil cooler 17 is connected to the lower oil circulation pipe 19. The upper oil circulation pipe 18 is connected to the upper side surface of the oil tank 16, and the lower oil circulation pipe 19 is connected to the lower side surface of the oil tank 16.

  An external fan 20 is fixed to the upper end of the rotating shaft 10.

  A lower air passage 21 through which wind passes upward is formed on one side in the horizontal direction in the housing 13, and an upper air passage 22 extending upward is formed above the lower air passage 21 so as to be continuous with the lower air passage 21. Has been. The oil cooler 17 is disposed in the upper air passage 22, and the external fan 20 is disposed on the top of the upper air passage 22.

  An internal fan 23 is fixed to the rotary shaft 10 in the housing 13.

  A terminal box 24 is connected to a position on the side surface of the housing 13 so as not to interfere with the lower air passage 21.

  Next, the operation of this embodiment will be described.

  The rotating shaft 10 is supported by the lower radial bearing 14 and the slide bearing 15 and rotates around the vertical axis. Together with the rotating shaft 10, the rotor 11, the external fan 20, and the internal fan 23 also rotate.

  As the external fan 20 rotates, the external air passes upward in the lower air passage 21 and passes upward in the upper air passage 22 and is discharged out of the external fan 20. At this time, the lower air passage 21 exchanges heat with the internal air in the housing 13 to cool the internal air, and further heat exchange with the lubricating oil in the oil cooler 17 in the upper air passage 22 to cool the lubricating oil.

  As the internal fan 23 rotates in the housing 13, convection in the housing 13 is promoted, and heat exchange between the air in the housing 13 and the external air passing through the lower air passage 21 is promoted.

  The sliding bearing 15 generates heat due to friction, and the temperature of the lubricating oil in the oil tank 16 rises. The high-temperature lubricating oil in the oil tank 16 flows through the upper oil circulation pipe 18 to the oil cooler 17, and the temperature is lowered by heat exchange with the cooling air in the oil cooler 17. 19 is returned to the vicinity of the lower part of the oil tank 16. The upper oil circulation pipe 18 and the lower oil circulation pipe 19 do not have a pump, but such a circulation of the lubricating oil occurs due to the natural circulation due to the temperature difference of the lubricating oil and the centrifugal force acting on the lubricating oil. The lubricating oil in the oil tank 16 can be cooled by circulation.

  The embodiment described above is merely an example, and the present invention is not limited to this, and various modifications are possible.

  For example, in the above embodiment, the sliding bearing 15 has both the functions of a thrust bearing and an upper radial bearing. As a modification, a sliding thrust bearing and a separate upper radial bearing may be provided instead of the sliding bearing 15. In this case, since a large load is not applied to the upper radial bearing, the upper radial bearing may be a rolling bearing.

  Further, in the above embodiment, the sliding bearing 15 and the oil tank 16 are disposed above the rotor 11 and the stator 12, but conversely, the sliding bearing 15 and the oil tank 16 are replaced with the rotor 11 and the stator. You may arrange | position below 12.

  Moreover, in the said embodiment, although the external fan 20 shall be attached to the upper end part of the rotating shaft 10, the external fan 20 can also be attached to the lower end part of the rotating shaft 10 as other embodiment.

  Further, in the above-described embodiment, a fully-closed vertical shaft type electric motor has been described as an example. However, the present invention can be applied to other types of vertical shaft motors, and can also be applied to various types of vertical shaft generators.

DESCRIPTION OF SYMBOLS 10 Rotating shaft 11 Rotor 12 Stator 13 Housing 14 Lower radial bearing 15 Slide bearing 16 Oil tank 17 Oil cooler 18 Upper oil circulation pipe 19 Lower oil circulation pipe 20 External fan 21 Lower air path 22 Upper air path 23 Internal fan 24 Terminal box

Claims (4)

A rotation axis rotatable around a vertical axis;
A rotor fixed to the rotating shaft;
A stator disposed radially opposite to the rotor radially outward of the rotor;
A sliding bearing that surrounds the outer periphery in the radial direction of the rotating shaft at an intermediate position in the axial direction of the rotating shaft and rotationally supports the gravity load of the rotating shaft and the rotor;
An oil tank for surrounding the slide bearing and storing lubricating oil;
An oil cooler that is disposed outside the oil tank and cools the lubricating oil;
An oil circulation pipe communicating between the oil tank and the oil cooler;
An external fan fixed to the rotating shaft and sending cooling air to the oil cooler;
A housing that hermetically accommodates the rotor and stator;
A lower air passage disposed vertically through the housing;
Arranged above the lower air passage, accommodates the oil cooler, receives the cooling air flowing out from the lower air passage , guides it around the oil cooler, the cooling air around the cooler An upper air passage connecting the flow path and the cooling air flow path driven by the external fan;
A vertical axis rotating electrical machine having
The oil circulation pipe includes a lower oil circulation pipe connecting the lower part of the oil tank and the oil cooler, and an upper oil circulation pipe connected to the oil tank and connected to the oil tank above the lower oil circulation pipe. And
The lubricating oil in the oil tank is configured to flow by natural convection through the upper oil circulation pipe to the oil cooler, and further return to the oil tank through the lower oil circulation pipe.
Vertical shaft rotating electrical machine characterized by A rotation axis rotatable around a vertical axis;
A rotor fixed to the rotating shaft;
A stator disposed radially opposite to the rotor radially outward of the rotor;
A sliding bearing that surrounds the outer periphery in the radial direction of the rotating shaft at an intermediate position in the axial direction of the rotating shaft and rotationally supports the gravity load of the rotating shaft and the rotor;
An oil tank for surrounding the slide bearing and storing lubricating oil;
An oil cooler that is disposed outside the oil tank and cools the lubricating oil;
An oil circulation pipe communicating between the oil tank and the oil cooler;
An external fan fixed to the rotating shaft and sending cooling air to the oil cooler;
A housing that hermetically accommodates the rotor and stator;
A lower air passage disposed vertically through the housing;
Arranged above the lower air passage, accommodates the oil cooler, receives the cooling air flowing out from the lower air passage, guides it around the oil cooler, the cooling air around the cooler An upper air passage connecting the flow path and the cooling air flow path driven by the external fan;
An internal fan fixed to the rotating shaft in the housing;
Have
After the heat from the air in the housing is transferred to the outside air passing through the lower airway, the outside air is guided to the upper airway,
Vertical shaft rotating electrical machine characterized by The sliding bearing and the oil tank are disposed above the rotor and the stator, and the external fan is disposed above the bearing and the oil tank,
The cooling air passing upward through the lower air passage is configured to pass upward through the upper air passage and then exhausted through the fan;
The vertical axis | shaft rotary electric machine of Claim 1 or Claim 2 characterized by these.   The said oil cooler is provided with the some heat exchanger tube by which the said lubricating oil distribute | circulated inside and the fin was formed in the outer surface, The Claim 1 thru | or 3 characterized by the above-mentioned. The vertical axis rotating electrical machine described.

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