JPH07190141A - Transverse vibration isolator using multiple leaf springs - Google Patents

Abstract

(57) [Summary] [Purpose] Development of a new damper that can replace the squeeze film damper used as a rolling bearing damper in high-speed rotating machines such as turbomachines. [Structure] A plurality of multiple leaf springs 3 are installed in the circumferential direction between an inner ring 1 and an outer ring 2, and a wedge-shaped oil passage gap 8 is formed between the inner ring 1 and the outer ring 2 so that a divided internal fluid space 5 is filled with a proper amount of working fluid (generally oil), a lid plate 6 is installed on the outside, an oil groove is formed inside the lid plate 6, and two fluid supply holes 11 are provided on the circumference thereof. A transverse vibration isolator using multiple leaf springs characterized by being installed as described above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lateral vibration isolator using multiple leaf springs, and more particularly, to a squeeze used as a rolling bearing damper in a high speed rotating machine such as a turbo machine. Film damper (squeeze film damper)
r) is related to the development of a new damper.

[0002]

BACKGROUND OF THE INVENTION Squeeze film dampers are mechanical elements often used to provide damping forces to ball bearings or to stabilize rotor supports, which are formed by inner and outer rings. The principle is that the fluid damping force is generated by inserting oil into the narrow annular space.

[0003]

However, the squeeze film damper requires a cooling device because it generates a large amount of heat due to a very narrow oil film gap, and a continuous lubricating oil supply and recovery device is required. It is very difficult to use, complicated, cannot be standardized, and therefore cannot be mass-produced. Since the squeeze film damper changes the critical speed by simply providing damping force to the rotating mechanical system, it lacks the ability to stabilize the system, and the damping coefficient changes rapidly according to the eccentricity. It is very difficult to analyze the system due to sex.

[0004]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to easily handle, standardize and mass-produce as a damper having appropriate elasticity and damping to complement the shortcomings of the existing squeeze film damper as described above. It is to create a new fluid damping damper structure that can be realized.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail with reference to the accompanying drawings. A plurality of multiple leaf springs 3 are circumferentially installed between the inner ring 1 and the outer ring 2 so as to form a wedge-shaped oil passage gap 9 with the inner ring, and the working fluid is stored in the divided inner fluid space 5. (Generally, oil) is filled in an appropriate amount, a cover plate 6 is installed outside, an oil groove 7 is formed inside the cover plate 6, and two or more fluid supply holes 11 are installed on the circumference thereof. .

It is also possible to install the ball bearing 1a inside the inner ring 1 as shown in FIG. In the figure, unexplained reference numeral 4 is an intermediate fixing element, 9 is a sealing element, and 10
Is a fastening element. According to the present invention as described above, in FIG. 1, a large number of multiple leaf springs are installed in the circumferential direction to support the inner ring, so that the inner ring and the outer ring are relatively disposed. Elasticity can be given, and it is determined by the number of plates, plate thickness, plate width, plate length, spring plate material, etc. of the multiple plate spring with a large elastic coefficient, and the circumference. This structure can also be determined by the number of multiple leaf springs installed in one direction. Therefore, the damper of the present invention has a very great advantage that it can give elasticity which is hardly present in the squeeze film damper, and that the elastic coefficient can be easily adjusted.

Therefore, it is possible to design the rotary machine by stabilizing the rotary machine by increasing the difference between the critical speed and the operating speed without changing the performance characteristics of the rotary machine. Further, in FIG. 1, when the inner ring makes a relative motion with respect to the outer ring, the volume of each inner fluid space changes, so that a flow occurs between the inner fluid spaces through the oil passage gap of FIG. Therefore, a pressure difference is generated between the internal fluid spaces. At this time, a damping force is generated in the inner ring due to the pressure difference. Therefore, the magnitude of the damping coefficient is determined by the viscosity of the fluid and the flow resistance coefficient related to the oil passage gap and the like. Therefore, the damper of the present invention can easily adjust the damping coefficient such as the elastic coefficient, and not only can sufficiently exert the damping effect as necessary, but also more than the damping coefficient obtained by the existing squeeze film damper or the sliding bearing. A large damping coefficient can also be obtained.

In the damper of the present invention, since the inner fluid space and the outside are shut off by the sealing element by the cover plate of FIG. The advantage is that it does not require continuous supply. Further, since the internal fluid space of the damper of the present invention is much larger than the oil film of the existing squeeze film damper, the heat capacity of the internal fluid is increased and the temperature rise of the working fluid is not deepened. It is not necessary to pay much attention to cooling the lubricating oil as compared with the case of using.

It has been confirmed by the inventors' theoretical studies that the damper of the present invention has a characteristic that the elastic modulus and the damping coefficient are not twisted (cross couple) but also have symmetry. Therefore, an unstable phenomenon does not occur even when it is intended to be used for high-speed machinery, and the rotational body motion analysis of the mechanical system including the damper of the present invention becomes simpler.

Existing squeeze film dampers have no other choice but to function as dampers only after the mechanical system has been completely assembled and the oil pump has been activated, making it difficult to standardize and therefore mass production was impossible. But,
Since the damper of the present invention can be handled as one complete product, it has a very great advantage that compatibility can be increased by standardization and mass production is possible, thus increasing economic value. .

As shown in FIG. 3, the damper of the present invention can be used not only to replace an existing complicated squeeze film damper with a ball bearing but also to replace a general structure (such as a pipeline of a nuclear power plant). It can be used as a support element. In particular, by making the contact between the inner ring and the multiple leaf spring tangential to the inner ring, as shown in FIG. 1 for the structure of the present invention,
A wedge-shaped oil film between the inner ring and the multiple plate (Fig. 1
It is characterized in that (a, b parts) are formed.
This structure allows the contact point between the inner ring and the multiple leaf spring to be separated when there is a relative sliding velocity between the inner ring and the multiple leaf spring, that is, when the damper of the present invention is used as a bearing. The damper of the present invention can also be used as a bearing, because a hydrodynamic force that tends to cause it is generated and plays a role of suppressing direct contact between two solid objects to reduce friction loss. Also, when the damper of the present invention is used as a bearing, as described above, due to the characteristics of the elastic coefficient and the damping coefficient, the oil fit (oi
(1 whip) phenomenon does not occur, there is an advantage that the lubricating oil supply can be simplified, and due to the effect of standardized plain bearings, it has a lot of economic value in the relevant industrial field. Become.

[Brief description of drawings]

FIG. 1 is an internal sectional view of a damper of the present invention.

FIG. 2 is a side sectional view of the damper of the present invention.

FIG. 3 is an internal cross-sectional view of a damper in which a rolling bearing is inserted and fixed.

[Explanation of symbols]

 1 Inner ring 2 Outer ring 3 Multiple leaf spring 4 Intermediate fixing element 5 Inner fluid space 6 Lid plate 7 Oil groove 8 Oil passage gap 9 Sealing element 10 Fastening element 11 Fluid supply port

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Kim Jung-Soo South Korea Busan-Sibguk-Hagjang-Dong Gungan Apartment 104-501

Claims (4)

[Claims] 1. A lateral vibration isolator using multiple leaf springs, wherein a plurality of multiple leaf springs 3 are installed in the circumferential direction between an inner ring 1 and an outer ring 2. 2. The inner ring 1 and the multiple leaf spring 3 form a wedge-shaped oil passage gap 8, and the divided inner fluid space 5 is filled with an appropriate amount of working fluid (generally oil) and The lateral vibration isolator according to claim 1, wherein a multi-plate spring is used in which a cover plate 6 is installed. 3. A horizontal plate according to claim 1, wherein an oil groove 7 is formed inside the cover plate 6 and two or more fluid supply holes 11 are provided on the circumference of the oil groove 7. Vibration isolation device. 4. The lateral vibration isolator according to claim 1, wherein a ball bearing 1a is installed inside the inner ring 1 again and a multiple leaf spring is used.