RU2070680C1 - Vibration insulation device - Google Patents

Abstract

FIELD: mechanical engineering. SUBSTANCE: vibration insulation device comprises flange 6, branch pipes 1 and 2 with ring ribs 3, and outer shell 5 with ribs 4. Ribs 3 and 4 from a contactless labyrinth seal which may be filled with vibration insulation material 8. The device is coupled with a pipe line segment via flanges 6. The axial gap between branch pipes 1 and 2 provides vibration insulation of the pipe line segments. The number of stages of the labyrinth seal is chosen so that to provide atmospheric pressure in the end stages. This prevents leakages of fluid from the device. EFFECT: improved vibration insulation. 3 cl, 2 dwg

Description

 The device relates to means of combating vibration in pipelines, for example, in shipbuilding.

 Known vibration-isolating devices using rubber pipes of various designs (II Klyukin. "Combating noise and vibration on ships", L. Sudostroenie, 1971, p. 291), and.with. N 1252603. This type of device can work in low pressure pipelines. To increase the working pressure of the vibration-isolating device, rubber-metal pipes are made that have greater rigidity, but also have worse vibration-isolating characteristics.

 Rubber-based devices cannot operate at elevated temperatures.

 Flexible bellows made of corrugated metal tubes are also used as vibration isolation devices (see the book by I.I. Klyukin). They operate at high temperatures and fairly well isolate low-frequency vibrations. At high frequencies, wave transmission of sound through metal walls is possible.

 As a prototype, a vibration-isolating device of the pipeline was selected, containing its fastening elements in the pipeline and an elastic insert, as N 1117428 with priority 16.03.83. The peculiarity of the insert is that it consists of an outer and inner shell and a tube wound between these shells. One end of the tube is connected to the inner surface of the pipeline, the other to the environment.

 This device has good anti-vibration properties, but can not work at high pressures and elevated temperatures.

 In the proposed vibration-isolating device containing end flanges, installed with a gap of the outer and inner shells, the gap between which communicates with the transported medium. The inner shell is formed by two nozzles installed with axial clearance. Opposite ends of the nozzles are fixed on the flanges, and ring-shaped protrusions are installed on their outer surface. On the inner surface of the outer shell also annular protrusions are fixed. The protrusions on the nozzles and the shell form a non-contact labyrinth seal.

 The space between the casing and the nozzles can be filled with vibration damping material.

 In addition, the casing for ease of installation is made detachable and equipped with fasteners.

 To ensure proper vibration isolation, the nozzles do not touch each other. In order to eliminate the flow of the working medium through the gap, the design uses the principle of a labyrinth throttle seal. In such a seal, significant resistance is created in the path of the flowing liquid (water, steam, gas, etc.). In each subsequent chamber of the seal, the pressure will be less than in the previous closest to the gap.

 By choosing the appropriate number of such throttling stages, it is possible to achieve a state where the pressure of the working medium in the last chamber is equal to atmospheric and there will be no outflow of the working medium from the vibration isolation device.

 The number of steps will decrease if the cavity of the labyrinth seal is filled with vibration damping material. The choice of the type of material is determined by the necessary characteristics of vibration isolation and the type of working medium.

 When filling the labyrinth cavity with a vibration damping substance, varying the elasticity of the material and the number of degrees, you can make a "soft" device in terms of vibration isolation, which holds any pressure in the pipeline and is structurally reliable.

 The advantages of the design are its small dimensions, especially when using a filler, and the ability to modify the design parameters for the type of working medium, pressure and the necessary characteristics of vibration isolation.

 The design of the vibration isolation device of the pipeline is illustrated in the drawing.

 In FIG. 1, 2 shows a section of the device and the cross section of the pipe and the casing.

 The vibration isolation device of the pipeline contains nozzles 1 and 2, mounted relative to each other coaxially and with a gap.

 Each pipe on the outer surface from the side of the gap contains a series of radial annular protrusions 3. The female casing 5 contains radial annular protrusions 4.

 The casing 5 is mounted in such a way that the radial annular protrusions 4 of the casing 5 enter the depressions between the protrusions 3 of the nozzles 1 and 2, forming a non-contact labyrinth seal. Each pipe 1 and 2 is equipped with a fastening element 6, in this case a flange connection. The casing 5, as shown in section AA, is made of two parts, which are fastened with a bolt connection 7. The labyrinth seal can be filled with vibration damping material 8. The outer casing 5 is fixed in axial and radial directions relative to the internal nozzles 1 and 2 or self-fixation under the action of variable pressure in the chambers when the casing 5 is displaced, or by mounting the suspensions to the support on which the pipeline is installed.

 The vibration isolation device of the pipeline works as follows.

 The device through the fastening elements 6 is connected to the pipeline, or to the mechanism. Due to the fact that the pipes 1, 2 are installed with a gap, complete vibration isolation is carried out.

 The working medium is throttled due to the non-contact labyrinth seal formed by the nozzles 1, 2, the casing 5 and the annular radial protrusions 3 and 4, the pressure in the chambers more remote from the gap is reduced. By choosing the appropriate number of throttling stages, it is possible to achieve a state that the pressure in the extreme chamber will be equal to atmospheric and there will be no outflow of the working medium. When filling the seal with vibration damping material 8, the hydraulic resistance increases, and the number of throttling stages can be reduced. Various types of materials can be used as filling depending on the working environment in the pipeline. As a vibration damping material, for example, raw microporous rubber can be used in a working medium water. An increase in the pressure of the working medium can worsen the vibration damping characteristics due to a change in the filling density, however, this can be compensated by a change in the size and number of stages of the labyrinth seal.

 The assembly of the device is easier to produce with a split casing 5. In this case, the sections of the casing 5 are fastened, for example, by a bolted connection 7.

 This vibration isolation device of the pipeline can work at elevated pressures and temperatures of various working environments.

Claims (3)

 1. The vibration isolation device of the pipeline containing end flanges installed with a gap of the outer and inner shells, the gap between which is in communication with the transported medium, characterized in that the inner shell is formed by two pipes installed with an axial gap, the opposite ends of which are fixed on the flanges, and on the outer the surface of the nozzles are installed transverse annular protrusions, while on the inner surface of the outer shell also transverse annular protrusions are fixed, forming s with projections nozzles contactless labyrinth seal.  2. The device according to claim 1, characterized in that the gap between the outer shell and the nozzles in the labyrinth seal is filled with vibration damping material.  3. The device according to claim 1, characterized in that the outer shell is detachable and provided with fasteners.

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