JPH066696Y2 - Bearing cooling device for horizontal shaft type rotating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is used in the field of rotary machines such as hydraulic turbines and generators, and more particularly to a bearing cooling device for a horizontal shaft type rotary machine.

(Prior art) Conventionally, a main shaft is rotatably supported by a bearing base, an oil ring is wound around the main shaft, and a heat receiving part of the heat pipe is installed in the lubricating oil in the oil tank and a heat radiating part of the heat pipe. There is known a bearing cooling device for a horizontal shaft type rotating machine in which a lubricating oil cooled by a heat pipe is drawn out of an oil tank, pumped up by an oil ring to pass along a main shaft, and a bearing is cooled.

(Problems to be Solved by the Invention) When cooling the lubricating oil with a heat pipe, the heat transfer coefficient increases as the flow velocity of the lubricating oil increases, and the heat receiving effect of the heat pipe increases. Moreover, even if the heat pipe is attached to a low temperature position, the cooling function of the heat pipe cannot be fully exerted.

Here, in the case of the conventional example, the oil ring pumps up the lubricating oil close to the surface, and because the pumping amount is small, there is natural convection inside the oil tank, the lubricating oil flow rate is low, the heat transfer coefficient is low, and the heat receiving of the heat pipe The heat receiving effect in the part is small,
Further, the oil level is high and the lower part is low, and the temperature difference is large, so that the heat pipe installed in the lower part of the oil tank cannot fully exhibit its function. Moreover, in the conventional example, not only the heat is dissipated by the heat pipe but also the heat is naturally dissipated from the surface of the oil tank. However, as described above, the temperature difference of the lubricating oil is large and the temperature distribution on the surface of the oil tank is not uniform, so that the heat dissipation effect is small.

(Means for Solving Problems) The present invention solves these problems, that is, the main shaft 1 is rotatably supported by the bearing base 2, and the oil tank 4 is wound by the oil ring 3 wound around the main shaft 1. The lubricating oil 5 inside is pumped up and bathed on the spindle 1, and the heat receiving portion 60 of the heat pipe 6 is installed in the oil tank 4 and the heat radiating portion 6 of the heat pipe 6 is installed.
In a bearing cooling device for a horizontal shaft type rotary machine in which 1 is drawn out of the oil tank 4, oil intake holes 20 and oil discharge holes 21 are provided on the left and right sides of the bearing base 2, respectively, and along the outer circumference of the collar portion 10 of the main spindle 1. A groove 22 that connects the oil suction hole 20 and the oil discharge hole 21 is provided, and partition plates 7, 7 are provided in the oil tank 4 to circulate the circulation paths 40, 40 below the oil discharge hole 21 and the circulation below the oil ring 3. And the circulation path 40, 40 and the circulation path 41.
With the partition plates 7, 7 communicating with each other, and a space 70 through which the upper lubricating oil 5 passes is provided with the partition plates 7, 7, the space 70 communicates with the oil suction hole 20, and the heat receiving portion 60 of the heat pipe 6 is connected. It is characterized by arranging a plurality of in parallel in the vertical direction.

(Embodiment) The bearing metal 24 made of white metal is fixed to the main body 23 to form the bearing metal base 2, and the oil sump 2 is provided on the left and right ends of the bearing metal base 2.
5 and 25 are formed, and overflow holes 2 are provided to each oil sump 25.
7, the bearing hole 2 is provided with a balance hole 26, the oil sumps 25, 25 are communicated with each other, and the lubricating oil 5 ′ is put into the oil sumps 25, 25 and the balance hole 26. Collar part 10 to main shaft 1,
10 is fixed, the oil rings 3, 3 are wound around the main shaft 1, the main shaft 1 is rotatably supported by the bearing base 2, and the lower surface of each oil ring 3 is the surface portion of the lubricating oil 5 in the oil tank 4. Put in. A series of oil suction holes 20 and oil discharge holes 21 are provided on the left and right of the main body 23 and the bearing metal 24, and an extension pipe 21 ′ of the oil discharge hole 21 is fixed to the main body 23.
A groove 22 that connects the oil suction hole 20 and the oil discharge hole 21 is formed on the zero contact surface. The pair of partition plates 7, 7 is fixed in the oil tank 4 to form the circulation paths 40, 40 on the lower end side of the oil discharge hole 21 and the circulation path 41 on the oil ring 3, 3 side, and the lower end of each partition plate 7 is formed. 7a is separated from the bottom plate 42 of the oil tank 4 and the circulation paths 40, 4
0 and the circulation path 41 are communicated with each other, and a space 70 for passing the upper lubricating oil 5 to each partition plate 7 is formed with a through hole or a notched groove (shown by a chain line in FIG. 2), and a pocket 71 is provided in each partition plate 7.
To fix the gap 70 and the oil suction hole 20 to each other. A plurality of heat pipes 6, 6, 6 ... Are installed in the oil tank 4, and the heat receiving portions 60, 60, 60 are formed by heat receiving fins.
... are arranged in parallel in the vertical direction in the circulation paths 40, 40, 41, and the heat radiation parts 61, 61, 61, which are made of heat radiation fins,
.. is led out of the oil tank 4.

When the main shaft 1 rotates here, the lubricating oil 5 is pumped up by the oil rings 3 and 3 and flows along the main shaft 1 to cool the bearing base metal 2. After that, most of the lubricating oil 5 heated by frictional sliding between the main shaft 1 and the bearing base 2 returns to the circulation path 41. On the other hand, since there is a groove 22 along the outer periphery of the collar portions 10 and 10, and the oil suction hole 20 and the oil discharge hole 21 communicate with this groove 22, the rotation of the collar portion 10 integrated with the main shaft 1 causes a viscosity increase. The pumping action occurs, and the heated lubricating oil 5 in the vicinity of the surface of the circulation path 41 is sucked into the oil suction hole 20 from each void 70 through the pocket 71, and through the groove 22 the oil discharge hole 21 and the extension pipe 21 '.
Is discharged to the circulation path 40, enters the circulation path 41 from below the circulation path 40, and circulates. The lubricating oil 5 is cooled by the heat pipes 6, 6, 6 ... While circulating. That is, when the lubricating oil 5 heats the heat receiving portion 60 of the heat pipe 6, the working fluid in the heat pipe 6 evaporates and moves to the heat radiating portion 61. When the heat radiating section 61 is cooled by receiving a cooling medium such as the atmosphere, the working fluid is condensed, and the condensed working fluid moves inside the wick of the heat pipe 6, returns to the heat receiving section 60, and evaporates again. By repeating this, the lubricating oil 5 is cooled.

Since the lubricating oil 5 is forcedly circulated by viscous pump action in this embodiment, the flow velocity of the lubricating oil 5 is increased, the heat transfer coefficient is increased, and the heat receiving effect of the heat pipe 6 is improved. Also, since the lubricating oil 5 circulates quickly due to the viscous pump action,
The lubricating oil 5 under the oil tank 4 does not become extremely low temperature,
The temperature distribution in the oil tank 4 is made uniform, and the heat pipe 6 installed in the lower part can sufficiently exert its function and the oil tank 4
The temperature distribution of is also made uniform, and the natural heat radiation effect from the surface of the oil tank 4 is also improved. Further, since a plurality of heat pipes 6, 6, 6, ... Are arranged in parallel along the flow of the lubricating oil 5, the oil temperature does not rise during circulation, and the surface of the circulation path 41 is constantly cooled. You can send oil.

Although the main shaft 1 is immediately oiled by the oil rings 3 and 3 when the main shaft 1 is started, the flanges 10 and 10 and the bearing metal 24
It takes time for the lubricating oil 5 to reach the contact surface with the bearing metal 24, and since the bearing metal 24 is heavily loaded, seizure may occur. Here, in this embodiment, the oil sump 2
Lubricating oils 5'and 5'in 5 and 25 are preliminarily attached to the collar portions 10 respectively.
Since it enters the contact surface between the bearing metal 24 and each bearing metal 24, seizure can be prevented. Further, during the rotation of the main shaft 1, a part of the lubricating oil 5 drawn up by the oil rings 3 and 3 passes from the contact surface between the main shaft 1 and the bearing metal 24 through the contact surface between the collar portion 10 and the bearing metal 24 to collect oil. If the oil level of the lubricating oil 5'has risen to 25,
The lubricating oil 5'exits from the overflow hole 27 and circulates 40
Enter It should be noted that the left and right oil sumps 25, 25 may be slightly deviated from each other depending on the processing accuracy and the assembly condition of each component.
When the main shaft 1 is started, one lubricating oil 5'may not reach the contact surface between the flange 10 and the bearing metal 24. Here, in this embodiment, the left and right oil sumps 2 are formed by the balance holes 26.
5 and 25 are communicated with each other so that the oil surfaces coincide with each other so that the contact surface between the collar portion 10 and the bearing metal 24 can be supplied with oil.

(Effect of the Invention) This invention applies heated lubricating oil from the circulation path on the oil ring side to the partition plate gap, the oil suction hole of the bearing base, the groove along the main shaft flange, the oil discharge hole, and the oil discharge hole side. Since it returns to the circulation path on the oil ring side from below the partition plate through the circulation path of, the lubricating oil can be convected and the main shaft rotates,
Since the viscous pump action is generated by the oil suction hole, the groove along the main shaft flange, and the oil discharge hole, the lubricating oil can be forcedly circulated, the flow velocity is increased, and the heat receiving effect of the heat pipe can be improved and the lubricating oil Temperature distribution can be made uniform, the heat pipe at any position can fully exert its function, and since multiple heat pipes are arranged in the vertical direction, the lubricating oil can be reliably cooled, and the cooling effect on the bearing Since the temperature distribution of the lubricating oil is uniform, the efficiency of natural heat dissipation from the oil tank surface can be increased.

[Brief description of drawings]

FIG. 1 shows an embodiment of this invention, FIG. 1 is a sectional view,
FIG. 2 is a sectional view taken along the line AA, and FIG. 3 is a partial cutout BB.
FIG. 1 …… spindle, 2 …… bearing base metal 3 …… oil ring, 4 …… oil tank 5, 5 ′ …… lubricating oil, 6 …… heat pipe 7 …… partition plate, 7a …… bottom end 10 …… collar part , 20 ... Oil suction hole 21 ... Oil discharge hole, 22 ... Groove 23 ... Main body, 24 ... Bearing metal 25 ... Oil sump, 26 ... Balance hole 40, 41 ... Circulation path, 42 ... Bottom plate 60 ... Heat receiving part, 61 ... Radiating part 70 ... Void, 71 ... Pocket

Claims (7)

[Scope of utility model registration request] 1. A main shaft 1 is rotatably supported by a bearing base metal 2,
The lubricating oil 5 in the oil tank 4 is wound by the oil ring 3 wound around the main shaft 1.
In a bearing cooling device for a horizontal shaft type rotary machine, which pumps up the oil to bathe the oil to the main shaft 1 and further installs the heat receiving portion 60 of the heat pipe 6 in the oil tank 4 and draws the heat radiating portion 61 of the heat pipe 6 out of the oil tank 4. , The oil intake holes 20 and the oil discharge holes 21 are provided on the left and right sides of the bearing base 2 respectively, and the collar portion 10 of the spindle 1 is provided.
A groove 22 that connects the oil suction hole 20 and the oil discharge hole 21 is provided along the outer circumference of the oil tank, and partition plates 7, 7 are provided in the oil tank 4 to provide circulation paths 40 and 40 below the oil discharge hole 21 and an oil ring. Thirty
And a circulation path 41 below the
0 and the circulation path 41 are communicated with each other below the partition plates 7 and 7, and a gap 70 is formed in the partition plates 7 and 7 for allowing the lubricating oil 5 above to pass therethrough. The gap 70 and the oil suction hole 20 are communicated with each other. 6. A bearing cooling device for a horizontal shaft type rotating machine, wherein a plurality of heat receiving portions 60 of No. 6 are arranged side by side in the vertical direction. 2. Lubricating oil 5'supplied to the contact surface between the collar portion 10 and the bearing base 2 is stored in oil reservoirs 25 formed at the left and right ends of the bearing base 2 and is transferred to the bearing base 2. Balance hole 26
The bearing cooling device for a horizontal shaft type rotating machine according to claim 1, wherein the oil sumps 25, 25 are communicated with each other. 3. A bearing metal 24 is fixed to a main body 23 to form a bearing base metal 2, and an oil suction hole 20 and an oil discharge hole 21 are formed in the main body 2.
3. The bearing cooling device for a horizontal shaft type rotating machine according to claim 1, wherein the bearing metal 24 is formed in a series, and the bearing metal 24 is provided with a groove 22. 4. The circulation paths 4 below the respective oil discharge holes 21 with the lower ends 7a, 7a of the partition plates 7, 7 separated from the bottom plate 42 of the oil tank 4.
The bearing cooling device for a horizontal shaft type rotating machine according to claim 1, wherein 0, 40 and a circulation path 41 below the oil ring 3 are communicated with each other. 5. The void 70 is formed with a through hole,
The bearing cooling device for a horizontal shaft type rotating machine according to claim 1, wherein the oil suction hole 20 and the oil suction hole 20 communicate with each other through a pocket 71 fixed to the partition plate 7. 6. A void 70 is formed with a notch groove to form a void 7.
0 and the oil suction hole 20 are fixed to the partition plate 71
The bearing cooling device for a horizontal shaft type rotating machine according to claim 1, wherein the bearing cooling device communicates with the bearing cooling device. 7. A plurality of heat receiving portions 60 of the heat pipe 6 are arranged side by side in the vertical direction in the circulation paths 40, 40 below each oil discharge hole 21 and the circulation path 41 below the oil ring 3. Item 1. A bearing cooling device for a horizontal shaft type rotating machine according to Item 1.