JP2014166062A - Rotary electric machine and lubrication oil cooling mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively inhibit the temperature rise in a lubrication oil of a rotary electric machine with low costs.SOLUTION: A rotary electric machine includes: a journal box tank 13 which supports a bearing and houses a lubrication oil 14; and a lubrication oil cooling mechanism 15 attached to the journal box tank 13. The lubrication oil cooling mechanism 15 has a cooling pipe 17, and the cooling pipe 17 penetrates through the journal box tank 13 to be attached to the journal box tank 13 in an airtight manner. A heat radiation part 21 is formed at the exterior of the journal box tank 13, and an inlet opening 19 and an outlet opening 20 are formed in the journal box tank 13. The inlet opening 19 is connected with the outlet opening 20 at the exterior of the journal box tank 13. The inlet opening 19 and the outlet opening 20 are positioned below a liquid surface 23 of the lubrication oil 14 in the journal box tank 13 in a normal state.

Description

  The present invention relates to a rotating electrical machine and a lubricating oil cooling mechanism therefor.

  When a sliding bearing is used in a rotating electric machine such as an electric motor or a generator, the bearing is supported by the axle box tank, and lubricating oil is stored in the axle box tank.

  In order to cool the bearing, cooling fins are provided on the outer wall of the axle box tank, or cooling air is sent to the outside of the axle box tank to be cooled by the atmosphere.

  In order to increase the cooling capacity of the lubricating oil, a technique is also known in which the lubricating oil is forcibly taken out and circulated by an oil pump to dissipate heat outside the axle box tank.

  Furthermore, a technique for cooling lubricating oil with a water-cooled heat exchanger is also known (see Patent Document 1).

Japanese Patent Laid-Open No. 2444763

  Cooling with air from outside the axle box tank is limited in cooling capacity, and the structure for compulsorily extracting the lubricating oil and circulating it with an oil pump or using a water-cooled heat exchanger is complicated. And also increases costs.

  The present invention has been made in view of such circumstances, and an object thereof is to effectively suppress an increase in the temperature of lubricating oil in a rotating electrical machine without much cost.

  In order to achieve the above object, a rotating electrical machine according to the present invention includes a shaft box tank that supports a bearing and stores lubricating oil, and a lubricating oil cooling mechanism having a cooling pipe attached to the shaft box tank. The cooling pipe is attached to the axle box tank in a liquid-tight manner through the axle box tank, and a heat radiating portion is formed outside the axle box tank. An inlet opening and an outlet opening are formed, and the inlet opening and the outlet opening are connected outside the axle box tank, and the inlet opening and the outlet opening are liquids of lubricating oil in a normal state in the axle box tank. It is located below the surface.

  The lubricating oil cooling mechanism according to the present invention is a lubricating oil cooling mechanism having a cooling pipe attached to a shaft box tank that supports a bearing of a rotating electrical machine and accommodates the lubricating oil, and the cooling pipe includes the shaft It is liquid-tightly attached to the axle box tank through the box tank, a heat radiating portion is formed outside the axle box tank, an entrance opening and an exit opening are formed in the axle box tank, and the entrance opening and the An outlet opening is connected to the outside of the axle box tank, and the inlet opening and the outlet opening are located below the liquid level of the lubricating oil in a normal state in the axle box tank.

  According to this invention, the temperature rise of the lubricating oil of the rotating electrical machine can be effectively suppressed without much cost.

It is the elevation which looked at the electric motor which concerns on one Embodiment of this invention from the axial direction, Comprising: The left half is an external view and the right half is sectional drawing.

  An electric motor according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an elevational view of an electric motor according to an embodiment of the present invention as viewed from the axial direction, in which the left half is an outline view and the right half is a cross-sectional view. Here, an electric motor will be described as an example, but the present invention can also be applied to a generator.

  In the electric motor, a rotor (not shown) is attached around the rotating shaft 11, and a stator (not shown) is arranged on the outer side in the radial direction of the rotor via a gap. The stator is fixed to the outer frame 12.

  The rotating shaft 11 is rotatably supported by two bearings (not shown). In this embodiment, the bearing is a plain bearing. The bearing is supported by the axle box tank 13. The axle box tank 13 is configured in a liquid-tight manner, and a lubricating oil 14 is stored therein. A lubricating oil cooling mechanism 15 is attached to the side surface of the axle box tank 13 through the side surface.

  The lubricating oil cooling mechanism 15 includes a plug 16, a cooling pipe 17, and a heat radiating plate 18. An opening is formed in the side surface of the axle box tank 13, and a plug 16 is inserted into the opening and is sealed in a liquid-tight manner. The plug 16 can be attached to and detached from the opening of the axle box tank 13.

  A through hole is formed in the plug 16, and a cooling pipe 17 is inserted into the through hole of the plug 16, and the space between the cooling pipe 17 and the plug 16 is sealed in a liquid-tight manner.

  The cooling pipe 17 is a U-shaped tube, and the two parallel tube portions of the U-shaped tube are arranged so as to be lined up and down, and the inlet opening 19 and the outlet opening 20 are opened inside the axle box tank 13, An outlet opening 20 is disposed above the inlet opening 19. The cooling pipe 17 is folded outside the axle box tank 13 to form a heat radiating portion 21. A large number of heat radiating plates 18 are attached to the outside of the heat radiating portion 21 of the cooling pipe 17. The cooling pipe 17 and the heat radiating plate 18 are preferably made of a material having high thermal conductivity, for example, copper or aluminum.

  The outlet opening 20 is disposed at a position lower than the normal lubricating oil level 23 in the axle box tank 13. Thereby, both the inlet opening 19 and the outlet opening 20 are always below the lubricating oil level 23.

  A fan 24 for sending cooling air to the heat radiating plate 18 is disposed near the heat radiating plate 18.

  In the configuration described above, when the temperature of the lubricating oil 14 in the axle box tank 13 rises due to the operation of the electric motor, the lubricating oil 14 in the axle box tank 13 is cooled from the outlet opening 20 to the cooling pipe by natural convection of the lubricating oil 14. 17 enters the axle box tank 13 from the entrance opening 19 through the heat radiating portion 21. When the lubricating oil 14 passes through the heat radiating portion 21, heat is released to the atmosphere through the heat radiating plate 18, and the lubricating oil 14 is cooled. At this time, the fan 24 promotes the flow of cooling air.

  As mentioned above, although embodiment of this invention was described, this embodiment is shown as an example and is not intending limiting the range of invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope of the present invention and the gist thereof, and are also included in the invention described in the claims and the equivalent scope thereof.

  For example, in the above embodiment, the cooling air is forced to flow to the heat radiating unit 21 by the fan 24, but the fan 24 may be omitted and air cooling may be performed by natural convection of air. In the above embodiment, the heat radiating plate 18 is attached to the heat radiating portion 21. However, the heat radiating effect can be obtained by directly radiating heat from the cooling pipe 17 to the atmosphere without attaching the heat radiating plate 18.

  Further, since the lubricating oil cooling mechanism 15 is detachable, a plurality of types of lubricating oil cooling mechanisms 15 having different sizes of the heat radiating portion 21 are prepared in advance, and appropriate lubricating oil cooling is performed according to the use environment of the motor. The operation of selecting the mechanism 15 can also be performed. Further, when this electric motor is used in an environment where the lubricating oil cooling mechanism 15 is not required, the lubricating oil cooling mechanism 15 is removed and a closing plug (not shown) is attached to the opening of the axle box tank 13. You can also.

  In the above embodiment, the lubricating oil cooling mechanism 15 is attached to the opening on the side surface of the axle box tank 13, but the lubricating oil cooling mechanism 15 can also be attached to the opening on the axial end surface of the axle box tank 13. .

DESCRIPTION OF SYMBOLS 11 Rotating shaft 12 Frame 13 Shaft box tank 14 Lubricating oil 15 Lubricating oil cooling mechanism 16 Plug 17 Cooling pipe 18 Radiating plate 19 Entrance opening 20 Exit opening 21 Radiating part 23 Lubricating oil level 24 Fan

Claims (6)

An axle box tank that supports the bearing and contains lubricating oil;
A lubricating oil cooling mechanism having a cooling pipe attached to the axle box tank;
A rotating electric machine with
The cooling pipe passes through the axle box tank and is liquid-tightly attached to the axle box tank, a heat radiating portion is formed outside the axle box tank, and an inlet opening and an outlet opening are formed in the axle box tank. The inlet opening and the outlet opening are connected outside the axle box tank,
The inlet opening and the outlet opening are located below the level of lubricating oil in a normal state in the axle box tank;
Rotating electric machine.   The rotating electrical machine according to claim 1, wherein the lubricating oil cooling mechanism further includes a heat radiating plate attached to the outside of the heat radiating portion of the cooling pipe. The lubricating oil cooling mechanism further includes a plug that penetrates the axle box tank and is detachably attached to the axle box tank.
The cooling pipe passes through the plug and is liquid-tightly attached to the plug;
The rotating electrical machine according to claim 1 or 2, wherein   The rotating electrical machine according to any one of claims 1 to 3, wherein the cooling pipe is a U-shaped pipe, and the entrance opening and the exit opening are arranged side by side.   The rotating electrical machine according to any one of claims 1 to 4, further comprising a cooling fan that blows cooling air to the outside of the heat radiating portion of the cooling pipe. A lubricating oil cooling mechanism having a cooling pipe attached to a shaft box tank that supports a bearing of a rotating electric machine and accommodates lubricating oil,
The cooling pipe passes through the axle box tank and is liquid-tightly attached to the axle box tank, a heat radiating portion is formed outside the axle box tank, and an inlet opening and an outlet opening are formed in the axle box tank. The inlet opening and the outlet opening are connected outside the axle box tank,
The inlet opening and the outlet opening are located below the level of lubricating oil in a normal state in the axle box tank;
Lubricating oil cooling mechanism.

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