JPH06174176A - Sound insulating cover for pipe fitting - Google Patents

Abstract

(57) [Summary] [Purpose] To block unpleasant noise in pipe joints of water supply and drainage pipelines. [Structure] The member forming the outer shell 20 is a vinyl chloride resin 10
A vinyl chloride resin composition obtained by filling and adding 200 to 1000 parts by weight of barium sulfate and 30 to 100 parts by weight of a plasticizer to 0 parts by weight, and the member forming the inner shell 10 is
It comprises a foamable vinyl chloride resin composition or a foamable polystyrene composition. The inner size and shape of the inner shell 10 matches the outer shape and size of the pipe joint A for a water supply / drainage pipe, and is divided into two in the axial direction. The cracked sound-insulating cover P is put on the pipe joint A, and the sound-insulating putty a is packed in the seam portion p.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation cover for pipe joints which prevents unpleasant noise generated from water supply and drainage pipes of high-rise houses, middle-rise houses, two-family houses or buildings from leaking to the outside.

[0002]

[Prior art and its problems] Sound emitted from water supply / drainage pipes of high-rise houses, middle-rise houses, two-family houses or buildings,
Especially when it originates from another person's living area, it makes the discomfort particularly strong,
Occasionally, there are troubles among residents, and countermeasures are required.

Under this demand, the present applicant has filed Japanese Patent Application No. 4-7.
0947, 70956, 71250, 71
In No. 303, we proposed a sound insulation pipe that covers the water supply / drainage pipe to insulate sound. However, as a result of subsequent examinations and researches, it was found that most of the unpleasant noises from the water supply / drainage pipes were generated from the pipe joints such as L-shaped joints and T-shaped joints of the pipes. This is considered to be due to the collision of water supply and drainage with the pipe wall due to the change in the flow direction at the pipe joint.

In view of the above situation, an object of the present invention is to efficiently insulate sound in a pipe joint.

[0005]

In order to solve the above-mentioned problems, according to the present invention, the member forming the outer shell 20 is composed of 200 to 1000 parts by weight of barium sulfate and 100 parts by weight of vinyl chloride resin. A vinyl chloride resin composition obtained by filling and adding 30 to 100 parts by weight of an agent.
The member forming is made of a foamable vinyl chloride resin composition or a foamable polystyrene composition, and the inner dimension of the inner shell matches the outer shape of the pipe joint A for water supply and drainage pipes,
In addition, the sound insulation cover for pipe fittings is configured to be split in two in the axial direction.

Barium sulphate imparts a high sound insulation effect. When it is less than 200 parts by weight, the sound insulation effect is not exhibited within the allowable range of the pipe wall thickness, and when it exceeds 1000 parts by weight, mechanical strength and flexibility are increased. In addition to problems with the properties, kneading and injection molding become extremely difficult. In particular, the preferable number of compounding parts is 300 to 8 because the sound insulation effect and the mechanical strength, flexibility, kneading and injection moldability can be sufficiently satisfied.
It is 00 parts by weight. Barium sulfate has an average particle size of 7
It is preferable to use one having a particle size of 5 μm or less in an amount of 55% or more. When the particle size becomes large, kneading and injection molding become difficult, and the flexibility and surface of the molded sound insulation pipe become poor. Therefore, consider them appropriately and set appropriately.

If the amount of the plasticizer is less than 30 parts by weight, the kneading / injection molding becomes difficult, and if it exceeds 100 parts by weight, the mechanical strength is remarkably lowered and the characteristics are deteriorated with time.

[0008]

The sound-insulating cover according to the present invention having the above-described structure covers the pipe joint of the water supply / drainage pipeline, and the sound-insulating putty is packed in the seam portion (two split portions). The sound absorption layer (inner shell) absorbs sound from water supply and drainage, and the sound insulation layer (outer shell) shields unabsorbed sound so that it does not leak outside.

[0009]

EXAMPLE As shown in FIGS. 3 (a) to 3 (f), JIS
As shown in FIG. 1, a foam layer (sound absorbing layer) 10 is provided on each dimension and shape of the drainage pipe fitting A specified in K 6739.
Is assumed to be 10 mm thick, and the sound insulation layer 20 has a thickness of 3 mm thereon (the outer dimensions of the pipe fitting A have ribs and steps, but are assumed to be a smooth surface).
A molding die of 0 (either injection molding or press molding may be designed), and first, the sound insulation layer (outer shell) 20 is molded with this die.

Next, the mold for the designed sound absorbing layer (inner shell) 10 is loaded with the molded sound insulating layer (outer shell) 20 and the sound absorbing layer 10 made of foamed plastic and having a thickness of 10 mm is formed by injection molding. Mold. At this time, the shape of the inner shell molding die mandrel (core type) corresponds to the outer shape of the pipe joint of JIS K 6739. Here, since the material of the outer shell 20 is vinyl chloride (PVC), the material of the foam layer 10 needs to be capable of adhering to the outer shell 20, and the expandable vinyl chloride (PVC) resin composition Alternatively, expanded polystyrene (PS) is adopted.

After molding the outer shell 20, without removing the mold, only the molding mandrel is removed,
Instead, insert a mold mandrel for molding the inner shell, and insert the outer shell 20
The inner shell 10 can also be formed by injecting plastic into the void of the mandrel.

The pipe joint sound insulation cover P formed in this manner is vertically divided in the axial direction as shown in FIG. 1, and as shown in FIG. 2, the seam portion p remains in the vertically divided portion of the cover P. The sound insulation putty a is packed in the seam portion p, and the adhesive vinyl tape T is wound and fixed on the sound insulation putty a.

The sound insulating putty a comprises liquid chloroprene having an OH terminal group: 100 parts by weight, barium sulfate or iron powder (corrosion-proofed): 200 to 1200 parts by weight, organic flame-retardant fiber ( Phenol formaldehyde):
It has a composition of 1 to 50 parts by weight. At this time,
The length of the fibers may be 5 to 20 mm. When the length is short, the connection is poor, and when the length is long, it becomes difficult to knead the putty a.

Since this sound insulating cover P is formed into a pipe joint A shape and is longitudinally divided, a seam portion p is formed when the pipe is attached to the pipe joint A.
If the mold is designed to be molded separately, and the dovetail groove and the groove are fitted together at the seam portion p during the design, the work of filling the sound insulating putty a at the seam portion p becomes unnecessary, and the number of man-hours at the time of construction Can be reduced.

The outer shell 20 can be molded by either injection molding or press molding, but the inner shell 10 is more suitable for injection molding than press molding. This is because the outer shell 20 loaded in the mold may be softened and deformed due to the relationship between the heating temperature and the heating time for foaming, and the molding conditions are strict and it becomes difficult to mold. Also, FIG.
It is needless to say that the sound insulation cover P can be similarly formed in the pipe joint A and the like shown in (b) to (f).

In the sound insulation cover P shown in FIG.
The outer shell 20 is formed with the composition shown in FIG.
Has the following composition, put it in a stirring tank, and add PV
C foam sol is obtained, and a predetermined amount of this is injected into a mold and 180 ° C
After being heated and held at, it is cooled and PVC foam layer (inner shell 10)
And The expanded polystyrene (PS) was foamed and molded by a conventional method using commercially available beads. The degree of foaming was set to 30 times.

Polyvinyl chloride (PVC): 100 parts by weight DOP: 55 parts by weight Polyester secondary plasticizer: 10 parts by weight Dibasic lead phosphate: 1.5 parts by weight Azodicarbonamide: 3 Parts by weight

[0018]

[Table 1]

In each of the examples and comparative examples thus manufactured, the sound insulation effect during drainage was confirmed. The results are shown in Table 1. According to the results, it was possible to obtain a reduction of 10 dB or more at the transmission loss value of 500 Hz before and after mounting the sound insulation cover P. Incidentally, Comparative Example 5 is 10 dB.
Of the sound insulating layer (outer shell 20) has a problem in kneading.

Although barium sulfate was used as the high specific gravity filling material in each of the above-mentioned examples, part of barium sulfate can be replaced with lead oxide (PbO) if a higher sound insulation effect is desired.

[0021]

Since the present invention is constructed as described above,
Sufficient sound insulation can be obtained simply by covering the pipe joint, and manufacturability is also good.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is an explanatory diagram of use of the same embodiment.

FIG. 3 is a sectional view of each example of a pipe joint.

[Explanation of Codes] 10 Inner shell (sound absorption layer) 20 Outer shell (sound insulation layer) P Sound insulation cover p Seam part A Pipe joint a Sound insulation putty

Front page continuation (72) Koichi Maekawa 2-3-1 Iwata-cho, Higashi Osaka City Tatsuta Electric Wire Co., Ltd. (72) Inventor Kihachi Onishi 2-3-1 Iwata-cho, Higashi Osaka City Tatsuta Electric Wire Co., Ltd. In the company

Claims (1)

[Claims] 1. A vinyl chloride resin composition obtained by filling and adding 200 to 1000 parts by weight of barium sulfate and 30 to 100 parts by weight of a plasticizer to 100 parts by weight of vinyl chloride resin. The member forming the inner shell 10 is made of a foamable vinyl chloride resin composition or a expandable polystyrene composition, and the inner dimension of the inner shell 10 matches the outer shape of the pipe joint A for a water supply / drainage pipe. ,and,
A sound insulation cover for pipe joints that is split in two in the axial direction.