JPH0135065Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a thrust bearing used in a steam turbine shaft, a marine propeller shaft, etc.

(Conventional technology and its problems) Conventionally, the methods for cooling thrust bearings are as follows:
There are water, jacket, and multi-tube cooler methods.

The method described above is carried out by passing water through the cavity formed during casting of the casing.

This is because the structure is complicated and casting is difficult, so burrs are likely to appear on the casting, and the heat transfer properties of cast iron are poor.

Furthermore, since the heat exchange area in contact with the lubricating oil is limited, there is a problem in that the amount of absorbed thermal energy is limited.

On the other hand, in the multi-tube cooler system, as shown in FIG. 6, a large number of cooling pipes 16' are arranged in the oil chamber 8' of the casing 1'.

This not only has a complicated structure, but also has a large number of parts, and has a poor heat transfer coefficient because a large number of small hole tubes are provided close to each other in order to obtain a sufficient cooling area.

Furthermore, there was a problem in that these small hole tubes became clogged with rust and limescale.

(Technical problem to be solved by the invention) A technical problem to be solved by the invention to solve the above problems is to cool the thrust bearing with a cooling pipe having a simpler structure with a higher heat exchange rate.

(Technical means to achieve the technical problem) The technical means to achieve the above technical problem are a casing that forms an oil chamber, and a thrust collar rotatably installed in the center of the casing. a thrust pad arranged in a circular shape on the bottom of the casing and in contact with the lower surface of the thrust collar; a journal pad arranged around the thrust collar and in contact with its peripheral surface; In a thrust bearing composed of a cooling pipe for cooling lubricating oil, a large number of rings are connected to the winding wire over the entire length of the outer peripheral surface of the cooling pipe, with their annular surfaces intersecting at right angles. The heat exchange fins are wound helically, and the ring is formed in a planar radial shape.

(Function) According to the above configuration, the heat of the lubricating oil heated by the rotation of the shaft is absorbed and cooled by the heat exchange fins in the cooling pipe.

(Effects of the invention) By forming the invention as described above, the invention has the following effects.

Since the heat exchange fins having a simple structure are spirally wound around the cooling pipe, the heat exchange area is increased and the heat absorption rate can be improved.

Since the cooling pipe is formed by spirally winding heat exchange fins over the entire length of the outer peripheral surface, it is possible to achieve a reduction in size and weight.

(Example) An embodiment of the present invention will be described with reference to the drawings.

A in the figure is a thrust bearing used for steam turbines, marine propeller shafts, etc., and is composed of a casing 1, a thrust collar 2, a thrust pad 3, a journal pad 4, and a cooling pipe 5.

In the casing 1, the upper and lower surfaces of a cylindrical body 6 consisting of an outer cylinder 6a and an inner cylinder 6b are formed by upper and lower plates 7a, 7.
b, and an oil chamber 8 for accommodating lubricating oil m is formed therein.

The oil chamber 8 is divided into an upper oil chamber 8a and a lower oil chamber 8b by a partition wall 9 connected between the outer cylinder 6a and the inner cylinder 6b.
A cooling pipe 5 is provided in the upper oil chamber 8a.

Further, the lower plate 7b includes a rotating shaft 10.
Cylindrical reentrant sleeve 1 into which the
1 protrudes upward, and a thrust collar 2 is rotatably inserted into the reentrant sleeve 11.

The thrust collar 2 bears the rotating shaft 10 inserted into the reentrant sleeve 11 and rotates as the rotating shaft 10 rotates.
The lower part is housed in the inner cylinder 6b, and the upper part is attached with an upper plate 7a protruding from the inner cylinder 6b.

The bottom surface of the thrust collar 2 is rotationally supported by a thrust pad 3, the lower peripheral surface by a journal pad 4, and the intermediate peripheral surface is also held by an annular retaining plate 12 provided at the upper end of the inner cylinder 6b.

Further, a gap 13 is formed between the outer periphery of the reentrant sleeve 11 and the inner surface of the insertion hole 2a of the thrust collar 2, and communicates with the upper oil chamber 8a via the communication hole 2b to accommodate lubricating oil m.

The thrust pad 3 is a conventionally known type having an upper surface made of white metal and a pivot protruding from the lower surface, and is placed in an appropriate number of circles on a pedestal 14 formed from a protruding lower plate 7b.

Lubricating oil m is supplied between the upper surface of the thrust pad 3 and the lower surface of the thrust collar 2, and as the thrust collar 2 rotates, a tapered oil film is formed to lubricate the rotating shaft.

The lubricating oil m is supplied through a communication groove 14a that communicates with a lower oil chamber 7b recessed at an appropriate location on the pedestal 14, and is transferred to the journal pad 4 side.

The journal pad 4 has a conventionally known curved shape interposed between the lower peripheral surface of the thrust collar 2 and the peripheral surface of the inner cylinder 6b, and the lubricating oil m flowed from the thrust pad 3 side flows into the journal pad 4. A tapered oil film similar to that of the thrust pad 3 is formed between the inner surface of the pad 4 and the outer peripheral surface of the thrust collar 2 as the thrust collar 2 rotates, thereby lubricating the rotation.

The cooling pipe 5 is piped into the upper oil chamber 8a in a substantially annular shape, and has one end connected to an injection pipe 15 provided in the upper plate 7a.
a, the other end is connected to the spouting pipe 15b via a connecting pipe 15c, respectively.

Further, in the cooling pipe 5, heat exchange fins 16 are spirally wound over the entire circumferential length of the pipe body 5a.

As shown in FIG. 4, the heat exchange fin 16 is formed by continuously fixing an elliptical ring 16a of an appropriate size to a winding wire 16b with their annular surfaces facing each other, It is attached radially by wrapping it around the circumference.

Note that the ring 16a is not limited to an elliptical shape, but may be formed in a circular shape or the like, and the shape is arbitrary.

Therefore, the lubricating oil m in the oil chamber 8 is transferred to the upper oil chamber 8a.
from there through the communication hole 9a to the lower oil chamber 8b,
The inner cylinder 6 is connected from the lower oil chamber 8b through the communication groove 14a.
The oil is supplied into the inner cylinder 6b, passes through the journal pad 4, and is returned to the upper oil chamber 8a through the communication hole 17 that communicates the inner cylinder 6b and the upper oil chamber 8a.

The lubricating oil m heated by these 3 parts of the thrust pad and 4 parts of the journal pad is transferred to the cooling pipe 5.
is cooled down and circulated again.

In the figure, 18 is an oil level gauge, and 19 is an air bleed oil filter.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the thrust bearing of the present invention, Fig. 2 is a partially cutaway perspective view, Fig. 3 is a plan view of the cooling pipe, Fig. 4 is a sectional view taken along the line - 5
The figure is a sectional view taken along the line -- in FIG. 4, and FIG. 6 is a longitudinal sectional view showing a conventional example. In addition, in the figure, A: thrust bearing, 1: casing, 2: thrust collar, 3: thrust pad,
4: Journal pad, 5: Cooling pipe, 8: Oil chamber,
16: heat exchange fin, 16a: ring, 16b:
Winding wire, m: indicates lubricating oil, respectively.

Claims (1)

[Scope of utility model registration request] A casing that forms an oil chamber, a thrust collar that is rotatably installed in the center of the casing, a thrust part that is circularly arranged on the bottom of the casing and makes contact with the lower surface of the thrust collar, and a thrust collar that is arranged around the thrust collar. In a thrust bearing that is composed of a journal pad that is arranged and comes into contact with the circumferential surface of the thrust bearing, and a cooling pipe that is piped to the oil chamber and cools the lubricating oil, a winding is applied over the entire length of the outer circumferential surface of the cooling pipe. A thrust bearing characterized in that a number of rings are spirally wound around a heat exchange fin connected to each other so that their annular surfaces intersect at right angles, and the rings are formed in a planar radial shape.