JPS6357B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a suction pipe for a vacuum cleaner having a noise-reducing function.

Prior Art In the conventional suction pipe of this type, the extension pipe constituted the muffler itself, as shown in FIG. Although not shown, the internal structure of this muffler 3 was composed of an inner tube made of nonwoven fabric and an outer tube made of resin that covers the outer surface of the sound absorbing material.

Problems to be Solved by the Invention However, with the above conventional configuration, when the suction air mixed with dust flows through the inner cylinder, the dust gets entangled with the fibers of the nonwoven fabric, causing an increase in ventilation resistance. Furthermore, in the case of long and narrow pieces of garbage, there were drawbacks such as the possibility of piercing the nonwoven fabric and tearing the nonwoven fabric. In addition, since a silencer was configured in the extension pipe,
It also had drawbacks in terms of ease of use, such as being bulky and not being able to adjust the length of the extension tube.

The present invention solves these conventional problems and provides a suction pipe for a vacuum cleaner that is free from dust clogging, is easy to manufacture, and can also be used in existing vacuum cleaners.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides an inflow side pipe connected to a telescopic extension pipe at one end and an outflow side pipe connected to a hose connection pipe. It is constructed by filling a sound absorbing material between an inner cylinder made of synthetic resin having a plurality of sound absorbing holes perforated at the other end thereof and an outer cylinder covering the sound absorbing holes of the inner cylinder, and A mesh body is integrally molded on the inner surface of the inner cylinder with holes formed therein.

Effects According to the present invention, the mesh body is hardly clogged with dirt, and therefore, a decrease in air permeability can be prevented and the performance of the vacuum cleaner can be maintained well. Further, even an existing vacuum cleaner can be used by being connected between the hose connection pipe and the extension pipe, and the function of the extension pipe can be maintained as is.

In addition, the mesh body is integrated when forming the inner tube.
That peeling will disappear.

Embodiment The embodiment will be described below based on FIGS. 2 to 8.

In Figures 2 to 4, 1 is a floor suction device having a connecting pipe 2, 4 is a telescopic extension pipe, and 5 is a hose 6.
The connecting pipe 7 is a low-noise suction pipe, and has an inlet pipe 8 and an outlet pipe 9. Reference numeral 10 denotes an inner cylinder having an inlet pipe 8 and an outlet pipe 9 at both ends; 11 denotes a sound absorbing hole formed around the inner cylinder 10; the inner surface of the inner cylinder 10 is lined with polypropylene thread in the form of a mesh, for example; A woven net body 12 is provided. Reference numeral 13 denotes an outer cylinder, which is fixed to the inner cylinder 10 with a space formed between it and the inner cylinder 10 to maintain airtightness by means of a collar 14 and a protrusion 15 of the inner cylinder 10. 16 is a sound absorbing material inserted between the inner cylinder 10 and the outer cylinder 13.

In the above configuration, the airflow passing through the sound absorbing portion is free of protrusions or fluff of fibers that occur on the surface of the nonwoven fabric, so the airflow is smooth and free from clogging with dust. By integrally molding the net body 12 provided on the inner wall of the inner cylinder 10 during molding (injection molding) of the inner cylinder 10, curling of the ends or fraying of the fibers can be completely solved, and at the same time, the mesh body 12 can be integrally molded. Processing also reduces the cost of manufacturing parts. As the above-mentioned integral molding means,
This can be easily done by setting the mesh body 12 in advance in a mold for the inner cylinder 10, and then supplying the resin material to the same mold.

Furthermore, the structure of the inner cylinder 10 and the outer cylinder 13 of this embodiment is such that the inner cylinder 10 is a continuous body without any seams, and the strength is ensured by the pipe of the inner cylinder 10, so the outer cylinder 13 is simply Its only function is to transmit noise and provide airtightness. Therefore, the wall thickness of the outer cylinder 13 can be reduced considerably, and the manufacturing cost can also be reduced.

The mesh body 12 has almost no chance of getting caught by debris (particularly elongated debris such as toothpicks, matchsticks, hair, etc.) contained in the airflow flowing through the mesh surface, and is also extremely effective in transmitting noise inside the pipe to the sound absorbing material 16. In particular, dense nets with tens of meshes or more were particularly effective.
Figures 7 and 8 show data on the noise reduction effect of the low-noise suction pipe of this example. FIG. 7 shows the noise analysis results when the low-noise suction pipe is installed in the position shown in FIG. 2, and FIG. 8 shows the results when the low-noise suction pipe is not used. The measurement method is based on the method specified by Japanese Industrial Standards. A vacuum cleaner with a suction power of 135W was used, but since the noise from the vacuum cleaner itself was sufficiently damped, a vacuum cleaner with a noise value of 38 phon (A) was used. From this result, when a low-noise suction pipe is installed, 800Hz
It can be seen that the frequency band ~4000Hz is well muted.

FIG. 5 shows another embodiment of the present invention, in which the sound absorption holes 111 of the inner cylinder 110 are not provided all around the circumference, but are formed only on the wall surface in the horizontal direction in the drawing. moreover,
The center lines (B) of the sound absorption holes 111 are all in the horizontal direction.
By doing so, the inner cylinder 110 becomes a simple type that allows the mold to be opened and closed from side to side during molding, so that it is possible to reduce the manufacturing cost of the parts. In this case, it is not difficult to realize the area of the sound absorption holes without changing much from the sound absorption hole arrangement shown in FIG.

FIG. 6 shows still another embodiment of the present invention, in which an inlet pipe 208 and an inner cylinder 210 are integrally formed, and an outlet pipe 209 and an outer cylinder 213 are integrally formed. The inner cylinder 210 and the outer cylinder 213 are fixed to each other with a collar 214 and a protrusion 215 to maintain airtightness. Further, the fitting portion 217 is similarly fitted. With this configuration, the overall size of the inner cylinder 210 can be reduced, so a compact molding machine can be used, and manufacturing costs can be reduced.

In addition, in each of the above embodiments, it is explained that the inner cylinder and the outer cylinder are fixed by the collar and protrusion, but if the method is airtight and does not have any strength problems,
There are no particular limitations on the method, such as adhesion, fusion, welding, screwing, etc.

Effects of the Invention As described above, according to the present invention, by arranging the mesh on the inner wall of the inner cylinder, the problem of dirt clogging, which was a drawback of the conventional method, is solved and the performance of the vacuum cleaner is maintained well. Furthermore, since the net on the inner wall of the inner cylinder can be integrally molded during the molding of the inner cylinder, the parts can be manufactured at low cost, and are extremely effective in terms of performance and parts manufacturing.

In addition, the suction pipe of the present invention can be conveniently used by being directly connected between the existing vacuum cleaner hose and the extension pipe, and even if the same pipe is connected, the function of the extension pipe etc. will be affected. Therefore, the usability can be improved far more than before.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional example, and FIG. 2 is a side view of a vacuum cleaner using the vacuum cleaner suction pipe of the present invention.
FIG. 3 is a sectional view of a suction pipe for a vacuum cleaner according to an embodiment of the present invention, and FIG.
A′ sectional view, FIG. 5 is a sectional view of a suction pipe in another embodiment, FIG. 6 is a sectional view of a suction pipe in yet another embodiment, FIG. 7 is a noise performance diagram of the present invention, and FIG. 8 is a noise performance diagram when the suction pipe of the present invention is not attached. 8...Inflow side pipe, 9...Outflow side pipe, 1
0,110,210...Inner cylinder, 11,111...
Sound absorption hole, 12... Net body, 13, 213... Outer cylinder,
16...Sound absorbing material.

Claims (1)

[Scope of Claims] 1. An inflow side pipe connected to a telescopic extension pipe is provided at one end, an outflow side pipe connected to a hose connection pipe is provided at the other end, and a large number of sound absorption holes are bored. A sound-absorbing material is filled between the synthetic resin inner cylinder and an outer cylinder that covers the sound-absorbing holes of the inner cylinder, and a mesh is integrally molded on the inner surface of the inner cylinder where the sound-absorbing holes are formed. A suction pipe for a vacuum cleaner characterized by: 2. A vacuum cleaner according to claim 1, characterized in that the inner cylinder, the inflow side pipe, and the outflow side pipe are integrally molded, and the outer cylinder is covered with the outer cylinder and both ends are airtightly fixed. suction pipe. 3. One of the inflow and outflow pipes and the inner cylinder, and the other and the outer cylinder are integrally molded, the inner cylinder and the outer cylinder are overlapped, and the overlapped ends are hermetically fixed to each other. A suction pipe for a vacuum cleaner according to claim 1.