CS239755B1 - Vibration insulator for seating of machines - Google Patents

Abstract

In the embodiment of the vibration isolator according to the invention, a flexible member having the shape of a circular plate for absorbing vertical forces and another flexible member having the shape of a narrow high ring for absorbing horizontal forces are inserted between the body and the cover. The first flexible member rests on its circumference in the vertical direction on a circular rib and the second flexible member is placed in a groove formed in the radial ribs connected to the body and further in a groove formed in the radial ribs connected to the cover. Finally, the second flexible member has on its lower side projections extending between the radial ribs of the body and on its upper side projections which in turn extend between the radial ribs of the cover. The invention can be used primarily in mechanical engineering.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillator isolator for machine placement to limit the transmission of machine oscillations to a foundation.

The flexible bearing of the oscillating machine reduces the transmission of excitation forces and moments to the foundation. This will also reduce the transmission of sound waves to the foundation and possibly to the entire building. Flexible mounting of the machines has a positive effect on the life of foundations and construction, on the reduction of harmful vibrations and on the sound pressure level of individual radiated frequency components.

Typically, vibration isolators with flexible members made of steel, rubber, cork, special fluid, air and a combination of steel and rubber are used for flexible storage. Vibration isolators with steel screw springs are the most used.

The disadvantage of steel springs, especially of the mentioned type, is the low damping with the possibility of oscillation of the machine system and the base in the area of resonance. Therefore, sometimes rubber or hydraulic elements, which have more pronounced damping effects, are added in parallel.

Vibration insulators with rubber members have the capability of large elastic deformation and damping of mechanical and acoustic vibrations. The disadvantages of rubber members are sensitivity to petroleum products, gradual wear even under normal fatigue loading, loss of damping properties and dependence of elastic modulus on temperature.

Vibration isolators with cork members are not effective in the low frequency range. Cork is also sensitive to certain chemicals and to higher temperatures.

Due to their special properties, liquid insulators, hydraulic and pneumatic, are used only in special cases and are very expensive to manufacture. A common disadvantage of all these types of insulators is the dependence of the horizontal stiffness on the vertical stiffness of the elastic member, or the impossibility to adjust these two parameters independently.

These disadvantages are overcome or significantly reduced by the vibration isolator of the present invention. SUMMARY OF THE INVENTION Two elastic members are inserted between the insulator body (lower part) attached to the base and the insulator lid (upper part) attached to the machine, a resilient member in the form of a circular plate for absorbing vertical forces and a resilient member in the form of a narrow high ring for absorbing vertical forces.

The first resilient member rests on its outer periphery in a vertical direction on a circular rib formed in the insulator body and at its center in the same direction on a central projection formed in the insulator cover. The function of the resilient member is maintained even if the circular rib is formed in the lid and the central protrusion in the insulator body.

The resilient member for accommodating horizontal forces is received in a groove formed in radial ribs connected to the insulator body and in a groove formed in radial ribs connected to the insulator cover.

The resilient member for absorbing vertical forces, or possibly the resilient member for absorbing horizontal forces, is comprised of several layers of material which are provided with holes for the passage of oil.

In the insulator body there is a space for an oil filling whose level is above the level of the resilient members for absorbing vertical and horizontal forces. The resilient member for absorbing the horizontal forces has protrusions on the underside extending between the radial ribs of the insulator body, and an upper protrusions extending between the radial ribs of the insulator cover.

The protrusions on the top and bottom of the resilient member are offset by half their length, thus ensuring proper positioning of the body and insulator cover for the desired function of the resilient member to absorb horizontal forces.

The invention makes it possible to provide oscillator isolators in which their horizontal and vertical stiffness can be independently determined, since the damping functions in the two directions are separated.

The stiffness in both directions can be adjusted by changing the number and thickness of the layers of the two elastic members either without manufacturing or with only minor modifications. The insulators of the invention also have an optional attenuation induced by alternate deformation of the multilayer resilient members by sucking in the oil between the layers and subsequently squeezing and pushing the oil through the apertures of the resilient member to absorb the vertical forces.

The attenuation value can be varied by the number of layers of elastic members, the number and size of holes in the layers of elastic members. The arrangement according to the invention is simple to manufacture, low maintenance and of adequate weight and dimensions.

An exemplary embodiment of the oscillator of the present invention is shown in the accompanying drawing, in which Fig. 1 shows a vertical section and Fig. 2 shows a horizontal section through the oscillator.

According to Figure 1, the insulator body 6 has the shape of a hollow cylinder with a solid bottom and is provided with feet for attachment to the base. The body is provided with feet 19 for attaching the insulator to the base. A concentric annular rib 6 is disposed within the body 6, on which a first resilient member 6 is received for absorbing vertical forces.

The resilient member 16 is comprised of several layers 11 of material. The resilient member 6 is supported by the lid 6 / upper part / of the insulator by a central projection 6 which is provided with a thread 20 for attachment to the machine. A groove 10 formed in the radial ribs 8 of the body 10 and a groove 9 formed in the radial ribs 10 of the cover 10 accommodates a second resilient member 10 for absorbing horizontal forces.

Also, the resilient member is composed of several layers of material. Holes 13 are formed in the individual layers of the elastic member and holes 14 are formed in the elastic member layers. the radial ribs 10 of the lid 2.

The protrusions '17 and '18 are offset by half the pitch. In the housing 6 there is a space 15 for the oil filling of the insulator whose level 16 is above the level of the two elastic members.

The function of the vibration isolator is evident from the previous description. The vertical components of the oscillation of the machine are absorbed by the resilient member 6 and the horizontal components by the resilient member 6. The periodic movement of the cap 10 is alternatively damped by the suction of the oil between the layers, its subsequent extrusion and, in particular in the vertical direction, by passing oil through the holes in the layers of the elastic element.

Claims (5)

A machine support oscillator, characterized in that a first resilient member (3) in the form of a circular plate for absorbing vertical forces is inserted between a body (1) fastening to the base and a machine fastening cover (2) and a second resilient narrow ring-shaped member (4) for absorbing horizontal forces. 2. An oscillator as claimed in claim 1, characterized by. The first resilient member (3) on its outer periphery rests vertically on a circular rib (5) formed in the body (1) and at its center in the same direction on a central projection (6) formed in the lid (2), wherein the annular rib may also be formed in the lid (2) and the central projection in the body (1) and that the second resilient member (4) is received in a groove (7) formed in the radial ribs (8) connected to the body here (1) and in a groove (9) formed in the radial ribs (10) associated with the wolf (2). Vibration isolator according to Claims 1 and 2, characterized in that the first resilient member (3) is composed of material layers (11) and the second resilient member (4) is composed of material layers (12), the layers being provided with openings (3). 13) in the member (3) and the holes (14) in the member (4). Vibration isolator according to Claims 1, 2 and 3, characterized in that an oil filling space (15) is formed in the body (1), the level of which (16) is above the level of the first resilient member (3) and the second resilient member (4). /. Vibration isolator according to one of Claims 1, 2, 3 and 4, characterized in that the second resilient member (4) has protrusions (17) on its underside extending between the radial ribs (8) of the body (1) and protrusions (18) on the upper side. extending between the radial ribs (10) of the lid (2), the projections (17) and the projections (18) being offset from one another.