JPH034344B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bearing cooling device for cooling a bearing portion of, for example, a machine tool.

[Conventional technology]

FIG. 2 shows a conventional bearing cooling device disclosed in, for example, Japanese Patent Application Laid-Open No. 57-76320. In FIG. 2, 1 is a rotating shaft of a machine tool, and 2 is a bearing mechanism. Bearing 3 that supports rotation freely
and a bearing stand 4 that supports this bearing 3. 5 is a pulley connected to a drive electric motor (not shown) via a V-belt (not shown), 6 is a bed that supports the bearing mechanism 2, etc., and 7 is formed on, for example, the bearing stand 4 of the bearing mechanism 2, and includes ammonia, An annular hollow chamber 8 in which a working liquid such as fluorocarbon is sealed is a heat radiating device, and is cooled by a cooling fan 9. 10 is a steam pipe that communicates the hollow chamber 7 and the heat radiating device 8, and 11 is a liquid pipe that communicates the heat radiating device 8 and the hollow chamber 7. Note that after the interiors of the hollow chamber 7, heat dissipation device 8, steam pipe 10, and liquid pipe 11 are reduced in pressure, a predetermined amount of working liquid such as ammonia or chlorofluorocarbon is sealed inside them.

Next, the operation will be explained. The rotating shaft 1 is rotated by the rotational force transmitted by the driving electric motor to the pulley 5 via the V-belt. With this rotation, the bearing 3 generates heat due to friction and its temperature rises. The amount of heat generated in the bearing 3 is transmitted to the bearing stand 4. The amount of heat received by the bearing 3 in the bearing stand 4 is generated as latent heat of vaporization when the working liquid such as fluorocarbons in the hollow chamber 7 is heated and vaporized, and the vapor of the vaporized fluorocarbons uses its own vapor pressure. It moves through the steam pipe 10 to the heat dissipation device 8 and is cooled by the surrounding air by the cooling fan 9. At this time, vapors such as fluorocarbons condense and liquefy and return to liquid, but they release latent heat of condensation to the surrounding air.
The heat of the bearing 3 is radiated to the surrounding air. The condensed and liquefied working liquid passes through the liquid pipe 11 and returns to the hollow chamber 7 using gravity. By repeating such operations, the amount of heat generated by the bearing 3 is transported to the heat radiating device 8 for efficient cooling.

[Problems to be Solved by the Invention] However, in the conventional device configured as described above, the steam pipe 10 is communicated with the hollow chamber 7 located above the bearing stand 4, and the liquid pipe 11 is connected below the rotating shaft 1. The liquid pipe 11 of the bearing pedestal 4 is connected to the hollow chamber 7 of the bearing pedestal 4 located on the lower side, and the connection work and maintenance thereof are troublesome.

This invention was made to solve the above-mentioned problems, and an object thereof is to obtain a bearing cooling device with good workability.

[Means for solving problems]

The bearing cooling device according to the present invention has a liquid pipe communicating with the heat radiating device and the working liquid above the hollow chamber.

[Effect]

In the bearing cooling device according to the present invention, the working liquid condensed and liquefied in the heat dissipation device returns to the upper hollow chamber through the liquid pipe.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, numerals 1 to 4, 7, and 10 have the same structure as the conventional device described above. Reference numeral 12 denotes a liquid pipe that communicates between the heat radiating device 8 and the working liquid above the hollow chamber 7 .

Next, the operation will be explained. The amount of heat generated by the bearing 3 is transmitted to the bearing stand 4 as in the conventional case, and the working liquid in the hollow chamber 7 is vaporized and becomes steam, which moves to the heat radiating device 8 as shown by arrow A through the steam pipe 10. The working liquid condensed and liquefied in the heat dissipation device 8 returns to the upper hollow chamber 7 through the liquid pipe 12 as indicated by arrow B. By repeating such operations, the amount of heat generated by the bearing 3 is transported to the heat radiating device and efficiently cooled.

Incidentally, the portion of the bearing stand 4 that communicates with the hollow chamber 7 is only at the upper portion, and there is no communicating portion below the rotary shaft 11, which simplifies the connection work and maintenance of these communicating portions.

In the above embodiment, the hollow chamber 7 is provided in the bearing pedestal 4 of the bearing mechanism 2, but the hollow chamber 7 may be provided between the bearing 3 of the bearing mechanism 2 or between the bearing 3 and the bearing pedestal 4. However, the same effect as in the above embodiment can be obtained.

By the way, in the above explanation, the case of a bearing cooling device applied to a machine tool was described, but it goes without saying that this invention is not limited to this and can also be applied to cooling the bearing part of a rotating electrical machine such as a DC machine. This provides the same effect as the above embodiment.

〔Effect of the invention〕

As explained above, in this invention, by communicating the liquid pipe into the working liquid above the hollow chamber, the communication part of the hollow chamber of the bearing mechanism is limited to the upper part, thereby obtaining a bearing cooling device with good workability. be able to.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional side view of essential parts of a bearing cooling device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional side view showing a conventional bearing cooling device. In the figure, 2 is a bearing mechanism, 7 is a hollow chamber, 8 is a heat dissipation device, 10 is a steam pipe, and 12 is a liquid pipe.
Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An annular hollow chamber formed inside the bearing mechanism and filled with a working liquid, a steam pipe that guides the steam generated by vaporizing the working liquid in this hollow chamber to a heat radiating device, and condensing and liquefying the steam in the heat radiating device. and a liquid pipe for returning the working liquid to the hollow chamber, wherein the liquid pipe is connected to the working liquid above the hollow chamber, and the working liquid condensed and liquefied by the heat dissipation device is transferred to the hollow chamber. A bearing cooling device characterized in that the bearing is returned to the upper side.