FI78773B - BAELGUTJAEMNARE. - Google Patents

Description

! 78773

Paljetasain

The invention relates to a bellows balancer for balancing pipelines and the like, comprising a tubular resilient part and frame parts attached to its ends, by means of which the bellows balancer can be fastened to the piping.

D

Bellows equalizers are used extensively in various industries to counteract the forces caused by thermal expansion or movement of pipelines or ducts, and to prevent the propagation of vibrations and sound in the piping or ductwork.

10

In previously used solutions, the edges of the resilient part are pressed against the metal-structured frame parts by using a metal hoop part surrounding the frame part. The edge of the elastic part is then placed between the frame part and the hoop part. The rim part is fastened to the frame part by means of evenly spaced bolts.

Em. the disadvantage of the previously known solution is that due to the complex metal structure, the device becomes heavy. Due to the heavy structure, 2q installation work often becomes cumbersome and time consuming, which also increases costs. The manufacturing cost of a complex metal structure is also high because the cost of the material is high and the assembly is laborious due to the large number of parts required for the structure.

The object of the invention is to provide a bellows balancer by means of which the disadvantages of the prior art can be eliminated. This is achieved by means of a bellows equalizer according to the invention, which is characterized in that the frame parts are made of plastic material and molded into the elastic part.

The advantage of the bellows equalizer according to the invention is its light structure. The lightweight design results in the ease of handling of the finished bellows leveler, which significantly reduces the installation times of the bellows levelers compared to the prior art. The invention also has the advantage of 2 78773 low manufacturing costs and the fact that the structure can be changed in an advantageous manner according to the requirements of the respective application.

The invention will now be explained in more detail by means of a preferred embodiment shown in the accompanying drawing, in which the figure of the drawing shows a sectional view of a bellows equalizer according to the invention installed in a pipeline.

In the embodiment of the figure, the piping or duct 10 is generally indicated by the reference number 1. The bellows leveler is placed between the parts of the piping or duct in a manner known per se, as shown in the figure. In the example of the figure, the bellows equalizer is connected to the piping 1 by a bolt connection. Figure 1 shows only a part of the piping. The center line of the piping 15 is shown by a broken line. It is clear that the bellows equalizer connects the piping parts tightly together. The connecting bolts of the piping and the bellows equalizer are thus evenly distributed around the circumference of the pipeline.

The bellows equalizer comprises a tubular elastic part 2, 20 at the ends of which frame parts 3 are fastened, by means of which the bellows equalizer can be fastened to the piping or ductwork 1, as stated above.

The purpose of the bellows equalizer is to compensate, for example, for the axial movement of the piping 1, which may result from, for example, temperature fluctuations. Em. as a result of the movement, the elastic part 2 collapses and straightens correspondingly depending on the situation.

All of the above are known per se to a person skilled in the art, so they will not be explained in more detail in this connection.

In the solution according to the invention, it is essential that the frame parts 3 are made of plastic material and molded directly onto the elastic part 2. The frame parts 3 are thus manufactured and attached to the elastic part 2 in one and the same work step.

3,77773

Any suitable plastic mixture can be used as the material of the frame parts 3. However, the use of a soft material has been found to be particularly advantageous, as this increases the flexibility and correspondingly eliminates the fracture damage that easily occurs in bolted joints.

The openings required by the bolt connection are made, for example, by drilling into the frame part.

In addition, the attachment of the frame parts 3 to the elastic part 2 can be ensured by means of a reinforcement 4 fixed to the elastic part 10 in the frame part. The gain 4 can be; preferably use a net such as a metal net. Em. by means of the reinforcement 4, the attachment of the frame parts 3 to the elastic part 2 can be enhanced in an advantageous manner. The idea is that part of the reinforcement 4 attached to the elastic part remains inside the plastic material during the molding step, as shown in the figure. The reinforcement 4 can be attached to the elastic part in any suitable way.

Accordingly, a stiffening layer 5 can be arranged against the connecting surface of the frame part 3, i.e. on the surface which presses against the piping 20 when the bellows equalizer is installed in the piping 1. As a stiffening layer, for example, a glass fiber layer laminated with plastic material can be used. As the plastic material with which the glass fiber layer is laminated, a harder plastic material is preferably used than the softer plastic material used in the manufacture of the frame parts 3. The purpose of the stiffening layer 5 is to stiffen the joint surface, whereby the tightness of the joint is obtained.

The above embodiment is in no way intended to limit the invention, but the invention can be modified completely freely within the scope of the claims. Thus, it is clear that the bellows equalizer or its parts do not necessarily have to be exactly as shown in the figure, but other solutions are possible. The frame parts can be shaped completely freely according to the current situation. The structure of the flexible part can also be chosen 4 78773 completely freely according to the situation. An example of the structure of the elastic part is a layer structure in which the inner layer is a PTFE film, the middle layer is a fabric made of Kevlar material, and the outer layer is an EPDM rubber coated Kevlar fabric. Any suitable plastic material can be used as the material of manufacture of the frame parts, which provides sufficient flexibility and durability. Exemplary materials include heat and chemical resistant resin blends. The stiffening layer of the joint surface can also be formed of any suitable material. If the stiffening layer is formed from a glass fiber layer, the laminating material can be chosen completely freely according to the situation. As an example of lamination materials, hard resins can be mentioned. The attachment of the bellows equalizer 15 according to the invention to the piping can be realized by any solutions known per se. In this case, it is clear that, for example, the division and location of the bolt holes to be drilled in the frame parts can be chosen completely freely according to the openings of the respective pipe flange.

Claims (5)

5,77777 A bellows equalizer for smoothing pipelines and the like, comprising a tubular resilient part (2) 5 and frame parts (3) attached to its ends, by means of which the bellows equalizer can be fastened to the piping (1), feeling t made of plastic material and molded into the elastic part (2). Bellows equalizer according to Claim 1, characterized in that the attachment of the frame parts (3) to the elastic part (2) is ensured by means of a reinforcement (4) attached to the elastic part arranged inside the frame part. Bellows equalizer according to Claim 2, characterized in that the reinforcement (4) is a metal mesh. Bellows equalizer according to Claim 1 or 2, characterized in that a stiffening layer (5) is arranged on the connecting surface of the frame part (3). Bellows equalizer according to Claim 4, characterized in that the stiffening layer (5) is a glass fiber layer laminated with a plastic material.