JP3432535B2 - Vibration-proof fittings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connectable to a metal tube.
It has a lunge member (J1) at both ends, and an intermediate cylinder part (M) thereof.
In addition, the connection part (C) and the vibration isolation part (B) are formed.
Further, the present invention relates to a vibration-proof pipe joint in which the inner surface rubber layer (1), the intermediate rubber layer (7), and the outer surface rubber layer (13) are provided in the vibration-proof part. , For example, a vibration-proof pipe joint that is connected to a pipe to suppress vibration transmission and noise generation.

[0002]

2. Description of the Related Art Conventionally, as a vibration-proof pipe joint of this type, an inner rubber layer is formed of chloroprene rubber (CR) or nitrile butadiene rubber (NBR), and an intermediate rubber layer and an outer rubber layer are formed of chloroprene. Some were made of rubber (CR).

[0003]

Generally, vibration-proof pipe joints are required to have vibration-proof and flame-retardant properties. According to the conventional vibration-proof pipe joints described above, chloroprene rubber (CR) is used. Therefore, although it has an effect on flame retardancy, it has a drawback that it is inferior in vibration damping property. Further, it is possible to use isobutylene isoprene rubber (IIR) in order to enhance the vibration damping property, but the isobutylene isoprene rubber (IIR) has low flame retardancy and high vibration damping property at room temperature, but high temperature. It was not preferable because the anti-vibration property was not high.

Therefore, the object of the present invention is to have high flame retardance,
An object of the present invention is to provide a vibration-proof pipe joint having excellent vibration-proof properties even at high temperatures.

[0005]

The feature of the present invention for achieving this object is a flange portion connectable to a metal pipe.
It has a material (J1) at both ends and is connected to the intermediate cylinder (M).
(C) and a vibration-proofing part (B) are formed, and the vibration-proofing part is provided with an inner rubber layer (1), an intermediate rubber layer (7), and an outer rubber layer (13). Joint, said connection
Chloroprene with a reinforcing iron wire (8) embedded in part (C)
Rubber (CR) A filled rubber layer (9) made of composite natural rubber
In addition to being provided, at least the intermediate rubber layer (7) of the vibration isolator (B) is formed of a composition containing ethylene acrylic elastomer as a main component, and the effects obtained from them are as follows. .

[0006]

The ethylene acrylic elastomer used in the vibration-proof pipe joint of the present invention has a structure in which a part of the ethylene acrylic elastomer is replaced with a carboxyl group as a cross-linking site under the polymer design of copolymerizing ethylene and methyl acrylate. It is an elastomer, and it can be seen from FIG. 2 that this ethylene acrylic elastomer has a high loss coefficient even at high temperatures. The loss coefficient is an index representing the vibration damping property of rubber or the like, and generally, the larger the loss coefficient, the higher the vibration damping property.

According to the vibration-proof pipe joint of the present invention, since at least the intermediate rubber layer is formed of ethylene acrylic elastomer, the ethylene acrylic elastomer has higher flame retardancy than isobutylene isoprene rubber (IIR). Moreover, since it has a vibration-damping property equivalent to that of isobutylene isoprene rubber (IIR) at normal temperature and higher than that of isobutylene isoprene rubber (IIR) at high temperature, high vibration-damping property can be obtained while maintaining high flame retardancy. .

Further, the thickness of the intermediate rubber layer is 0.5.
If the thickness is at least mm, a high vibration damping property can be expected, and if the thickness of the intermediate rubber layer is 5 mm or less, a vibration damping pipe joint having a high vibration damping property can be manufactured at low cost without losing flexibility. Further, the spring hardness Hs of the intermediate rubber layer (JIS
When A) is 40 ° to 80 °, it has sufficient flexibility and good workability. Further, if the inner rubber layer is made of nitrile butadiene rubber (NBR), nitrile butadiene rubber (NBR) is a material having excellent oil resistance, so that it is possible to maintain higher oil resistance when connecting an oil supply pipe or the like. The outer rubber layer is chloroprene rubber (C
If it is set as R), chloroprene rubber (CR) is a material having higher flame retardancy than ethylene acrylic elastomer, so that the flame retardancy can be maintained higher.

[0009]

That is, the vibration-proof pipe joint of the present invention has high vibration-proofness while maintaining high flame-retardant property, so that it is highly safe and reduces adverse effects such as noise and vibration in the usage environment. It is now possible to provide vibration-proof pipe fittings.

Further, if the inner rubber layer is made of a material having high oil resistance and the outer rubber layer is made of a material having high flame retardancy, it can be used in a wider range of use conditions.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a vibration-isolating pipe joint used in a piping system equipped on a surface ship, and of the vibration-isolating pipe joints, what is commonly called a bellows type is shown. This vibration-proof pipe joint is composed of an intermediate tubular portion M and a connecting portion J that is continuously provided at both ends of the intermediate tubular portion M. The intermediate tubular portion M has a cylindrical connecting portion C and a spherical outer surface. And a cylindrical vibration-proofing part B having an expanded cylindrical part on its inner surface.
The cross-sectional shape is a multi-layered structure in which a large number of coating layers are laminated, and the connecting portion C has an inner surface rubber layer 1, a first reinforcing layer 3, a second reinforcing layer 6, and a filled rubber layer in order from the inner surface. 9,
Second intermediate rubber layer 11, second heat insulating layer 12, outer rubber layer 1
3 and a fifth heat insulating layer 16 are sequentially laminated in a multilayer structure, the vibration isolator B has an inner rubber layer 1, a first reinforcing layer 3, a second reinforcing layer 6, a first intermediate rubber layer 7 and a first intermediate rubber layer 7 in order from the inner surface. 2 intermediate rubber layer 11,
The second heat insulating layer 12, the outer rubber layer 13, and the fifth heat insulating layer 16 are laminated in this order to form a multilayer structure.
In the vicinity of the vibration isolator B, a third reinforcing layer 10 is provided between the filling rubber layer 9 and the second intermediate rubber layer 11, and the vibration isolator B from the vibration isolator B to the connecting portion C is provided. The third heat-insulating layer 1 is provided between the outer rubber layer 13 and the fifth heat-insulating layer 16 in the vicinity thereof.
4, the 4th heat insulation layer 15 is provided. In addition, the connecting portion J
Is the ring insulation layer 2 and the first reinforcement layer 3 and the reinforcement ring 4
And then externally fitted and adhered via the first heat insulating layer 5, and further, the inner rubber layer 1 is extended to the opening side,
A packing portion P is provided.

That is, the intermediate cylindrical portion M has an inner peripheral surface formed of an inner rubber layer 1 made of nitrile butadiene rubber (NBR) (Hs = 60 °), and a ring heat insulating layer made of aramid fiber at the connecting portion on the outer periphery thereof. 2, the outer periphery of the cylindrical body is covered with a first reinforcing layer 3 in the shape of a blind made of nylon fiber, the two layers are folded back near the opening of the connecting portion, and the reinforcing ring 4 is wound.

In the vicinity of the opening of the connecting portion C, the first heat insulating layer 5 is formed.
A flange member J1 is externally fitted and bonded to form a connecting portion J, and the inner rubber layer 1 is further extended to a position where the flange member J1 is inserted, and nitrile butadiene rubber (NBR) (Hs = 70 °) packing parts P are laminated, and the intermediate cylindrical part M is further covered with the second reinforcing layer 6, and then the vibration-proof part B is mainly composed of the ethylene acrylic elastomer having the composition shown in Table 1. First intermediate rubber layer 7, connecting portion C
The chloroprene rubber (CR) with the reinforcing iron wire 8 embedded in
A filled rubber layer 9 made of composite natural rubber is coated from the outer periphery. Then, on the outer periphery of the connection portion C in the vicinity of the vibration isolation portion B, a third reinforcing layer 10 made of a vinylon fiber in the shape of a blind is formed.

[0014]

[Table 1]

Further, the outer periphery of the intermediate cylindrical portion M is covered with a second intermediate rubber layer 11 made of chloroprene rubber (CR) mixed with thermally expanded graphite, and the outer periphery is covered with a second heat insulating layer 12 made of ceramic fiber. , Flame retardant insulating chloroprene rubber (C
This vibration-proof pipe joint is formed by covering the outer rubber layer 13 made of R) and further covering the outer periphery thereof with the third, fourth and fifth heat insulating layers 14, 15 and 16.

The connecting portion J is made of metal, and has a plurality of screw holes H for mounting on a pipe or the like arranged at regular intervals in the circumferential direction. It is used by connecting the entire anti-vibration pipe joint in the pipes around the engine.

[0017] That is, V is 5, a proof fucan joint according to the present invention, T is a metal pipe of normal, engine E is a vibration source or noise source, a pump, is in other machinery . Here, the vibration-proof pipe joint V is interposed between the pipes T and plays a role of reducing vibration and noise transmitted through the pipe T.

The flame-retardant and vibration-proof properties of the vibration-proof pipe joint thus produced are as shown below.

[Flame Resistance Test] In order to test the flame retardant performance, GL (Germaniseher Lloyd)
d) A flame resistance test conforming to the standard was performed. A vibration-proof pipe joint made of ethylene acrylic elastomer manufactured according to this example was used as a test sample, and from the bottom of the test sample, a flame having a flame temperature of about 800 ° C. was used for 3/4 of the sample length.
Flame heating was performed for 30 minutes to cover the above, and then an internal pressure (water pressure) that was twice the normal pressure was applied for 10 minutes, and a flame resistance test was performed to check whether or not there was a leak in the test sample. I passed without difficulty. Hot water (80 ° C.) is constantly circulated inside the test sample during burning.

[Anti-vibration test] The anti-vibration test was performed by an impact vibration method. As a result, for example, 125 A × 300 manufactured based on this embodiment
As shown in FIGS. 3 and 4, in the L 10K vibration-proof pipe joint, as compared with the conventional chloroprene rubber (CR) product, when the change of the loss coefficient with respect to the damping frequency was examined, It was found that the anti-vibration performance was exhibited in a wide frequency range, and an average improvement of 50% in the longitudinal direction and 30% in the lateral direction (improvement of loss coefficient level) was observed.

In this example, "(Hs =)" means that the spring hardness Hs (using a type A testing machine) is a spring hardness test based on JIS K6301 (vulcanized rubber physical test method). It is the hardness of rubber shown in JIS A).

[Other Embodiments] In this embodiment, an example in which the present invention is applied to a bellows type vibration-proof pipe joint is shown. However, the vibration-proof pipe joint of the present invention is applicable only to this type of vibration-proof pipe joint. It is not applied, but can be applied to, for example, a spherical bellows type vibration-proof pipe joint whose overall appearance is almost spherical. Further, in addition to those equipped on the surface ship, those used on general ships may be used.

In this embodiment, only the intermediate rubber layer 7 is formed of ethylene acrylic elastomer, and other materials are used for the other parts. However, the material used for the parts other than the intermediate rubber layer 7 is chloroprene rubber. It is conceivable to use various materials such as (CR), nitrile butadiene rubber (NBR), and isobutylene isoprene rubber (IIR). However, when the configuration of this embodiment is adopted,
It becomes possible to provide a joint excellent in flame retardancy and vibration proof with a relatively small cost increase.

Further, although the ethylene acrylic elastomer is used only in the vibration isolating portion B, the intermediate rubber layer 7 may be extended to the connecting portion C and used in the entire intermediate cylindrical portion M, or in other layers. You may. However, it is most effective to use the ethylene acrylic elastomer for the intermediate rubber layer 7 of the vibration isolator B in order to obtain a high vibration isolation effect. In addition, the intermediate tube portion M
The configuration of is not limited to the multilayer structure shown in this embodiment.

The expression "made of" means a rubber made of a composition whose main component is, for example, a chloroprene (CR) outer rubber layer. What is meant is an outer rubber layer made of rubber composed of a composition containing chloroprene (CR) as a main component.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall side view of a partially cut view of a vibration-proof pipe joint in the present embodiment.

FIG. 2 is a diagram showing the vibration damping property of the ethylene acrylic elastomer used in the present invention.

FIG. 3 is a diagram showing frequency characteristics in the vertical direction of the vibration-proof pipe joint of the present invention.

FIG. 4 is a diagram showing frequency characteristics in a lateral direction of the vibration-proof pipe joint of the present invention.

FIG. 5 is a schematic view showing an installation example of the vibration-proof pipe joint of the present invention.

[Explanation of symbols]

J connection part M intermediate tube 1 Inner surface rubber layer 7 Intermediate rubber layer 13 outer rubber layer B anti-vibration section

Continuation of the front page (56) Reference JP-A 52-48121 (JP, A) JP-A 60-139989 (JP, A) JP-A 3-125036 (JP, A) JP-A 2-238944 (JP , A) JP-A 2-113191 (JP, A) JP-A 61-192988 (JP, A) JP-A 62-5510 (JP, A) JP-A 1-126488 (JP, A) 58-49087 (JP, U) Actually developed 56-12190 (JP, U) Actually published 50-40323 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 27/00 -27/12

Claims (4)

(57) [Claims] 1. A flange member (J
1) is provided at both ends, and the intermediate cylinder (M) has a connecting portion.
(C) and a vibration-proof part (B) are formed, and the vibration-proof part is provided with an inner rubber layer (1), an intermediate rubber layer (7), and an outer rubber layer (13). And the connection part
Chloroprenego with reinforcing steel wire (8) embedded in (C)
A filled rubber layer (9) made of rubber (CR) composite natural rubber is provided.
In addition, a vibration-proof pipe joint in which at least the intermediate rubber layer (7) of the vibration-proof part (B) is formed of a composition containing ethylene acrylic elastomer as a main component. 2. The thickness of the intermediate rubber layer (7) is 0.5 m.
The vibration-proof pipe joint according to claim 1, wherein the vibration-proof pipe joint has a length of m to 5 mm. 3. The spring hardness Hs (JIS A) of the intermediate rubber layer (7) is 40 ° -80 °.
The vibration-proof pipe joint according to any one of 2. 4. The inner rubber layer (1) is formed of a composition containing nitrile butadiene rubber (NBR) and the outer rubber layer (13) containing chloroprene rubber (CR) as a main component. The vibration-proof pipe joint according to any one of 3 above.