JPS59180116A - Pad type bearing device - Google Patents

Abstract

PURPOSE:To restrict lowering of damping capability to prevent unstable vibration by utilizing a pad main body formed through pasting layers together in such a manner as a layer is positioned further outside, the larger its thermal expansion rate is. CONSTITUTION:The captioned device is formed by pasing together the plural number of the material layers 6a, 6b, 6c with different thermal expansion rate in such a manner as the layer is positioned further outside, the larger its thermal expansion rate is. Due to this positioning method, deformation of a pad main body 6 is prevented by a bymetallic effect at the time of high temperature operation, and lowering of damping capability to prevent unstable vibration is restricted.

Description

[Detailed description of the invention] The present invention relates to an improvement of a pad 4 bearing device.

There are various types of bearings conventionally used in rotating machines, such as rolling bearings and sliding bearings. Figure 1 is an example of this, where (1) is the rotor, (2) is the journal, and (3) is the rotor.
) is the bearing, (4) is the tilt pad, and (5) is the pivot. Among these types of pad-type bearing devices, pad chamber bearing devices used in large-capacity, high-speed rotating machinery are susceptible to unstable impurities such as oil whip (vibration unique to plain bearings).
In order to prevent J, as shown in Figure 2, a slanted metal plate (4
) is used. This Pad 4 type bearing device does not generate unstable vibrations, but under high loads, etc.
As shown in Figure 6, the contact surface (4α) with the journal (2)
′) side becomes high temperature, and due to the temperature difference with the low temperature bearing facing surface (4α side), the rose ′(4) deforms in the direction of the 4th south arrow ta force (the high temperature journal contact surface (4) (Z')
The side of the bearing facing surface (45') with a low temperature does not elongate much as shown by the arrow in Figure 4 (Bl), and due to the difference, the pad (4) expands as shown in Figure 4. (deformed in the q direction), that is, the pad (4) deforms from the state shown by the solid line in Fig. 6 to the state shown by the broken line, and the damping ability for preventing unstable imaging decreases (Fig. 5). In addition, in Fig. 6, the direction of rotation of the journal (2) is shown (El is the flow of lubricating oil).

The present invention addresses the above-mentioned problems and includes a rose body formed by gluing together a plurality of layers of materials having different coefficients of thermal expansion such that the layer with the higher coefficient of thermal expansion is positioned on the outside. The purpose of the pad type bearing device is to provide an improved pad bearing device that can prevent the deterioration of 7) 2 skills of preventing unstable vibrations.

Next, the pad type bearing device of the present invention will be explained from the one side shown in Fig. 6. (2) is the rotor ((] in Fig. 1)
(3) is the @ Uke, (5) is the pivot, (6) is the pad body that is the most distinctive feature of the present invention, (6)
cL) is the inner white metal layer, (6h) is the middle material layer (inner backing metal) with a higher thermal expansion rate, and (6C) is the outer layer with a higher coefficient of thermal expansion. layer (outer lining). The fixing means for these backing metals are shown in Fig. 7 (Il to (IV)). Fig. 7 (Il beam -
From Mavolt (7) K, Figure 7 (11) is Bolt (8)
Accordingly, the song in Fig. 7) is made by "Arimizo casting (9),"
Figure 7) is fixed by welding, sub-beam welding, diffusion welding (10), etc. The above pad 9 body (6
) are manufactured at room temperature and used in high temperature operating conditions.

The conventional pad body (4) deforms during operation as shown in Figure 6.4, reducing the damping ability for unstable imaging.
'tl, but with the pad device of the present invention,
1jt 4 material layer (6c) (6b) (6c
) are formed so that the pad body (6) with a larger coefficient of thermal expansion is placed 1'6 outward, and the bimetallic effect prevents deformation of the pad body (6) during high-temperature operation, preventing unstable imaging. This prevents the attenuation ability from decreasing.

Next, the effect of the present invention will be explained in more detail by comparing it with the conventional one. FIG. 8 shows the back plate of the conventional pad body, and FIG. 9 shows the back plate of the pad body of the present invention. The silver and gold (4b) in Figure 8 is made using steel for Rishina.
When fabricated at ℃, during use, the temperature of the inner surface (4α') was 100℃, and the temperature of the outer 1 surface C4b was 50℃.
'C, respectively, the temperature rise of the inner surface (4α') (・ma, 100°-25°-75°C, the outer ψ surface (4A)
') is 500-25°-25°'C, and the thermal expansion is: Inner + I + Surface (4α') = 75°C x 10xlo
=7.5xlO...(ri outer surface (4J') = 25℃
x10x10 =2.5x10 .--■. On the other hand, the back money (6h) (60) in Figure 9 is (6h)
(6C) was manufactured using steel material, and (6C) was manufactured using copper at 25"C. During use, the inner surface of the back metal (6b)
When the temperature of the 11111 surface (6C) (outer surface of the back metal (66)) of the back metal (6C) reaches 75℃, the back metal (6C)
The temperature of the outer surface C60 becomes 50℃, the average temperature of the backing metal (6h) becomes 81 (5°'C), the average temperature of the backing metal (6C) becomes 62.5°C, and the temperature of the backing metal (6b) becomes 50°C. Onmeiouke!, is 875℃-25℃=625℃, back metal (6C)
The temperature lll-load is 62.5°C - 25°C = 375°C, respectively, tt average mean thermal expansion, back metal (65) = 62.5°C x 10 x 10, = 6.25
xio... ■A gold (6C) = 37.5'Cx16
．． 6X10 =6.225X10 ・=Q4■
10 in the formula (■■) and 16.6 in the formula 0 are the coefficients of thermal expansion. In the /set body (6) of the present invention, as is clear from the formula 00, the thermal expansion on the inside and outside is almost the same, and deformation due to the temperature difference between the inside and outside is almost eliminated.

FIG. 10 shows that the same effect as described above can be achieved on the other male side where the load is heavy (only on the pad 9 which is significantly deformed). In addition, in Fig. 10, bimetal para) F (6h) is used for all four . The number is not limited to four, and may be more or less than four. FIG. 11 shows a white metal layer (1,3α) and a steel layer (13b).
(first backing metal), copper alloy layer (13c) (second backing metal), and aluminum alloy layer (13d) (sixth backing metal) are formed by cutting them together from the inside to the outside, 1
Figure 2 shows yet another example in which a bimetallic effect is produced by providing another backing metal (6C) only at the end of the backing metal (6h) that undergoes the most severe temperature deformation, and these examples are similar to the above. effect can be achieved.

Although the embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to such embodiments. It is something that can be done.

[Brief explanation of drawings]

Figure 1 shows an example of a conventional pad type bearing device.
The first view and the second view are the conventional putt';', q! 3. Line sectional front view showing another example of the i-bearing device. 4. 51=E
6 is a longitudinal sectional front view showing one embodiment of the pad type bearing device according to the present invention, and 7 (rl to No. 1111 side view, No. 8 and No. 91 are explanatory views explaining the effects of the conventional one and the one of the present invention, FIG. 10 is a vertical front side view showing another embodiment, No. (6)...Bud body (6α) (6h) (6C) (6d)...Material J<Re Sub-Agent Patent Attorney Shige Okamoto Figure 1 Figure 2 / Adventure Figure 7

Claims (1)

[Claims] A Nomurad type bearing device characterized by comprising a pad body formed by laminating a plurality of material layers having different coefficients of thermal expansion such that the layer with a higher coefficient of thermal expansion is located on the outside.