JPS6114306Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotating machine having a heat pipe as a rotating shaft, and an object of the present invention is to provide a configuration for effectively cooling a bearing.

The cooling mechanism in rotating machines is important, so a heat pipe with good thermal conductivity is used on the rotating shaft.
It is advantageous to cool the device from within. With this configuration, the rotating machine with the same output can be reduced by approximately 1/2
It is possible to reduce the weight to 3.

A conventional rotating machine of this type had a configuration as shown in FIG. A rotor 2 equipped with a heat pipe rotating shaft 1, a stator 3, a heat radiation fin 1a on the condensing side of the heat pipe, a cooling air intake 4 for introducing outside air to exchange heat with the radiation fin 1a, a cooling air outlet 5, and A cooling air outlet 5 is provided on the outside of a wind cylinder 8 that stands up to surround an opening 9a provided in a non-driving side shield 9.
A cooling fan 6 is housed inside. In order to cool the frame 7 and eventually the stator 3, this wind cylinder 8 has radial fins 7a extending in the axial direction on the circumferential surface of the frame 7, and fins 7a on the outer periphery of the frame 7, excluding the inner mounting legs.
It covers almost the entire circumference of the area. The heat pipe rotating shaft 1 has shaft portions 1c connected to both ends of the heat pipe, respectively, and these shaft portions 1c are supported by bearings 10 supported by the shield 9. In this case, the drive-side bearing 10, which is the evaporation side of the heat pipe, handles heat transfer from the heat pipe,
There was a concern that the permissible bearing temperature would be exceeded due to the high temperature air around the rotor. This has a large effect because the rotating shaft is made of a heat pipe with good thermal conductivity.

This idea was created with these points in mind.
It consists of three constituent elements that characterize it. Embodiments of the present invention will be described below with reference to FIGS. 2a and 2b.

That is, the first feature of the present invention is that a plurality of cooling fins 12a are provided on the shaft portion 12 on the evaporation side of the heat pipe rotating shaft 11 to increase the heat dissipation area of the shaft portion. This increases the thermal resistance from the evaporation part of the heat pipe rotating shaft 11 to the bearing 10, thereby suppressing a rise in temperature of the bearing 10 due to heat conduction from the rotating shaft 11.
Incidentally, a cavity 12b is provided in this shaft portion 12, and a small hole 12c that communicates this cavity 12b with the outside air is provided in the shaft portion 12.
It is also possible to increase the thermal resistance of the shaft portion by providing it at an appropriate position.

As described above, providing the cooling fins 12a is effective in reducing the heat conduction from the rotating shaft 11 using the shaft portion 12 as a medium, but the bearing 10 still receives heat due to heat conduction by the high temperature air around the rotor. be influenced by.

For this reason, a funnel-shaped heat partition plate 13 for blocking air circulation is provided between the bearing-side internal space containing the cooling fins 12a and the rotor body-side internal space. This partition plate 13 has a shield 1 on its outer periphery.
4 and a frame 7, and a heat pipe rotating shaft 11 is inserted through the center with a minimum gap that only allows rotation of the heat pipe. Therefore, the bearing 10 is isolated from the high-temperature air of the rotor body, thereby making it possible to suppress the temperature rise of the bearing.
This is the second structural condition that characterizes the present invention.

Furthermore, in the present invention, natural convection is achieved by providing two or more ventilation holes 14a communicating with the outside air at axially symmetrical positions of the shield 14, without sealing the bearing side internal space constituted by the heat partition plate 13. The heat dissipation by the cooling fins 12a of the bearing 10 and the shaft portion 12 is promoted. The ventilation holes can also be provided in the frame 7, and in either case, they are provided at axially symmetrical positions separated from each other, so that new air always flows through the bearing side space. This is the third component characteristic of the present invention, and together with the second component, which includes the heat partition plate, constitutes a cooling passage isolated from the high temperature air on the rotor side.

Therefore, the heat partition plate is a partition wall means that blocks heat transfer from the rotor to the bearing, and at the same time it is a partition wall means that forms a cooling passage that is not affected by high-temperature air. The bearing is equipped with heat dissipation fins that effectively cool the bearing in conjunction with the natural convection generated by the cooling passage. Furthermore, the thermal partition plate also has the effect of preventing dust from entering the rotor body space and deteriorating insulation of the rotor, and as a partition wall between the rotor and the outside air. Conversely, this can also be said to be a structural requirement associated with the provision of ventilation holes in the heat partition plate.

In this way, the above three structural requirements that characterize the present invention are independent structures, but
In order to achieve this effect, they are closely related to each other and form an integrated bearing cooling structure.

Note that the present invention is not limited to the above-mentioned natural cooling, but also allows forced cooling using the cooling fan 6.
The embodiment will be explained below based on FIGS. 3 and 3c. That is, the wind barrel 8 that houses the cooling fan 6 and has the air outlet 5 has conventionally been replaced with the frame fin 7.
The part extending to the vicinity of the end a is now formed to cover the outer end of the shield 14, and the ventilation hole 7b provided on the wind body side of the frame 7 (the ventilation hole 14a provided on the wind body side of the shield 14) ).

Therefore, during normal operation of the rotating machine in which the cooling fan 6 is operated, outside air enters the rotating machine from the cooling air intake port 4, cools the condensing side of the heat pipe rotating shaft 11, and at the same time, air is formed by the wind cylinder 8. The air inside the shield 14 divided by the heat partition plate 13 is sucked in through the ventilation hole 7b provided in the frame 7 through the flow path between the fins 7a.
At the same time, outside air enters the rotary machine through the hole 7c of the frame 7, which is not on the wind barrel side. Thereby, the shaft portion 12 including the bearing 10 and the cooling fins 12a is effectively cooled.

The above description has mainly been about the cooling method using the suction flow of the cooling fan 6, but it goes without saying that a forced flow method as shown in FIG. 3c can also be applied with a similar configuration. Note that common parts are designated by the same symbols.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a rotating machine equipped with a conventional heat pipe rotation shaft, FIGS. 2a and 2b are longitudinal sectional views and enlarged sectional views of essential parts showing an embodiment of the present invention,
Fig. 3a is a vertical sectional view showing an embodiment of the present invention when forced cooling is used, and Figs. 3b and 3c are enlarged views of main parts to show the operation in the case of suction flow and forced flow. FIG. In the figure, 6 is a cooling fan, 7 is a frame,
7a is a frame fin, 10 is a bearing, 11 is a heat pipe rotating shaft, 12 is a shaft portion, 12a is a cooling fin, 12b is a cavity, 12c is a small hole, 13 is a heat partition plate, 14 is a shield, 14a, 7b , 7c indicates a ventilation hole.

Claims (1)

[Claims for Utility Model Registration] 1. A rotating shaft comprising a heat pipe and a cooling fan for forcibly cooling a condensing part of the heat pipe, wherein a cooling fan is provided on the shaft part on the evaporation side of the heat pipe rotating shaft. In addition to providing the cooling fins, the bearing side internal space including the cooling fins and the rotor main body side internal space are provided with a shield or a thermal partition plate, and the bearing side internal space and the outside air are communicated with each other.
A rotating machine equipped with a heat pipe rotating shaft, characterized in that two or more ventilation holes are provided at axially symmetrical positions in a shield or frame. 2. A rotating machine according to claim 1 of the utility model registration, characterized in that a shaft portion having cooling fins is provided with a cavity communicating with outside air. 3 Utility model registration Claims Paragraph 1 is characterized in that a wind cylinder that guides the pushing or suction flow by a cooling fan is connected to a ventilation hole provided on the wind cylinder side of the frame or shield. Rotating machine. 4. The rotating machine according to claim 3 of the utility model registration, characterized in that the wind cylinder is formed to cover the frame fins and also cover the outer edge of the shield.