JP6509074B2 - Vacuum cleaner hose - Google Patents

Description

The present invention relates to a flexible hose made of synthetic resin having excellent flexibility, in particular, a hose for a vacuum cleaner used for a vacuum cleaner.

As the vacuum cleaner hose (so-called cleaner hose) connected between the vacuum cleaner main body and the hand operation part, various properties such as flexibility, crushing resistance, designability and durability of the hose are taken into consideration What has been known.

For example, Patent Document 1 discloses a cleaner hose having a reinforcing body made of a hard steel wire and having a hose wall formed in a concavo-convex wave shape. The hose is formed by pre-twisting a reinforcing member made of hard steel wire in a direction in which the hose is contracted, and is lightweight and has excellent stretchability.

JP 2005-40528 A

By the way, in the cleaner hose by which the hose wall was formed in the concavo-convex wave shape, the noise of the high frequency of pee from a hose may arise at the time of use of a vacuum cleaner. The cause and condition of this noise is not clear, but as the power of vacuum cleaners has been increased and the size has been reduced, the flow velocity of the air flowing in the cleaner hose has become high, and this noise has become more likely to occur. . In addition, when the hose wall of the cleaner hose is formed in a concavo-convex wave shape, this phi sound tends to be easily generated.

An object of the present invention is to provide a hose for a vacuum cleaner which is highly stretchable but is less likely to generate squeaking noise.

As a result of intensive investigations, the inventor has found that when a rib is protruded toward the inside of the hose on the inner peripheral surface of the portion where the hose wall is recessed, it is difficult to generate a beep and complete the present invention. The

The present invention is a hose for a vacuum cleaner having a corrugated wave-shaped hose wall, and a rib is integrally formed so that a rib protrudes inside the hose along a portion where the hose wall is recessed inside the hose. And the rib is not substantially covering the space along the uneven ridge of the hose wall where the hose wall is present inside the portion formed projecting toward the outside of the hose, and the section including the central axis of the hose The rib is provided to be inclined with respect to the direction orthogonal to the central axis of the hose, and the corrugated shape of the hose wall is provided in a spiral shape, and the hose wall extends along the portion projecting to the outside of the hose. And a helical reinforcement is provided on the inner circumferential surface of the hose wall, and in the portion of the hose wall sandwiched by the helical reinforcement, the rib is provided downstream of the air flow in the hose from the center of the hose wall portion. Provided at a position offset to It is a hose for an electric vacuum cleaner (first invention).

In the first aspect of the invention, it is preferable that a helical reinforcing body made of a material harder than the material forming the hose wall is provided along the portion where the hose wall protrudes to the outside of the hose (first example) 2 )).

According to the hose for a vacuum cleaner of the present invention (first invention), the hose is excellent in stretchability due to the uneven corrugated hose wall. On the other hand, since the rib is provided so as to protrude inside the hose, so-called squeaking noise is less likely to occur.

Furthermore, the hose of the first aspect of the invention can be manufactured efficiently, and the effect of suppressing the generation of squeaking noise is also high. In the hose of the second aspect of the invention, the hose is less likely to be crushed.

It is a partial cross section figure of the hose for vacuum cleaners of 1st Embodiment. It is a schematic diagram which shows the process in which the hose for vacuum cleaners of 1st Embodiment is manufactured. It is a schematic diagram which shows the outline | summary of pee noise generation test of the hose for vacuum cleaners. It is a schematic diagram which shows the air flow in the hose for vacuum cleaners of 1st Embodiment. It is a schematic diagram which shows the air flow in the conventional hose for vacuum cleaners. It is sectional drawing of the hose wall of the hose for vacuum cleaners of 2nd Embodiment. It is sectional drawing which shows the other example of the cross-sectional shape of a rib. It is sectional drawing of the hose wall of the hose for vacuum cleaners of 3rd Embodiment. It is a figure which shows the structure of a vacuum cleaner.

Hereinafter, an embodiment of a hose for a vacuum cleaner of the present invention will be described by taking a household vacuum cleaner as an example with reference to the drawings. The invention is not limited to the specific embodiments described below, but may be modified in form.

FIG. 9 shows the whole appearance of the vacuum cleaner, and the vacuum cleaner hose 1 is one end of the vacuum cleaner hose 1 via a connection pipe (opening member) 95 to an air inlet provided in the vacuum cleaner main body 99. The other end of the vacuum cleaner hose 1 is connected to the hand operation unit 98, and the extension tube 97 and then the floor nozzle 96 are continuously connected to the hand operation unit 98 to constitute a vacuum cleaner. ing.

The vacuum cleaner hose 1 may be provided with a plurality of conductive wires. The conductive wire can transmit an input signal of a switch provided in the hand operation unit 98 to the cleaner main body 99, and can supply electric power to the brush drive motor built in the floor nozzle 96. If possible, conductive wires for signal transmission and conductive wires for power supply may be shared. In addition, as described later, the conductive wire is not essential.

The structure of the hose 1 for vacuum cleaners of 1st Embodiment is shown in FIG. In FIG. 1, the upper half is shown in cross section and the lower half is shown in appearance. The vacuum cleaner hose 1 has a flexible hose wall 2 formed in a substantially cylindrical shape by a flexible synthetic resin, and helical reinforcing bodies 3 and 3.

The hose wall 2 is formed in a corrugated shape. In the present embodiment, it is formed in a helical uneven wave shape. The number of spiral lines may be one, or two or more as necessary. The uneven wave shape of the hose wall may have a form in which rings are connected in series. In the present embodiment, a corrugated corrugated shape of the hose is formed in a spiral of two lines.

As a synthetic resin which comprises the hose wall 2, comparatively soft synthetic resin materials, such as polyolefin resin, can be used, for example. As a polyolefin resin, low density polyethylene resin (LDPE), ethylene vinyl acetate copolymer resin (EVA), etc. are illustrated. Flexible vinyl chloride resin (PVC resin), thermoplastic elastomer (TPE), urethane resin, rubber, etc. can also be used as resin of a hose wall. The preferable hardness of the resin material constituting the hose wall 2 is about 50 to 80 (JIS Shore A). In the present embodiment, the hose wall is made of soft vinyl chloride resin. In addition, the synthetic resin which comprises a hose wall is colored by a predetermined | prescribed color as needed.

The helical reinforcements 3 and 3 are spirally wound and integrated with the inner circumferential surface of the hose wall 2. In the corrugated corrugated hose wall, it is preferable to integrate the helical reinforcement along the portion where the hose wall projects to the outside of the hose. The helical reinforcing body 3 may be made of a metal such as a hard steel wire, and a plurality of helical reinforcing bodies may be provided to double as conductive wires. Alternatively, the spiral reinforcing body 3 may be made of a hard resin. The helical reinforcement may be made of a material harder than the material constituting the hose wall, and the helical reinforcement well maintains the cylindrical shape of the hose. In the present embodiment, a hard steel wire is coated with a hard polyvinyl chloride resin to form helical reinforcements 3 and 3, and two helical reinforcements 3 and 3 are welded to the inner circumferential surface of the hose wall. There is.

A rib 4 is integrally formed on the inner circumferential surface of the hose wall 2 so as to be along the concave-convex shape. The rib 4 is formed of the same resin as the hose wall 2. The rib 4 is provided so as to project from the hose wall toward the inside of the hose in a direction toward the central axis of the hose along a portion where the hose wall is recessed inside the hose. That is, the rib 4 is formed so as to project from the inner peripheral surface of the portion where the hose wall 2 has entered the inside of the hose.

In the present embodiment, the ribs 4 are helical. Further, as shown in FIG. 1, when viewed in a cross section including the central axis 1 of the hose, the cross sectional shape of the rib 4 is a rectangular cross section, and the rib 4 is a plate or rod. The direction in which the rib 4 of the rectangular cross section is provided, that is, the direction of the side of the rectangular cross section of the rib 4 is inclined with respect to the direction m orthogonal to the hose central axis l. That is, the rib 4 is provided to be inclined to either the upstream side or the downstream side of the hose. In addition, although the space along the ridge of the unevenness of a hose wall exists in the inside of a hose in the part by which the hose wall 2 protruded toward the outer side, the rib 4 substantially corresponds to this space. There is no such thing as a dividing wall between this space and the space at the center of the hose, not covering.

Furthermore, in the hose wall between the helical reinforcements 3, 3, the rib 4 is provided at a position offset from the center, ie, at a position offset from the center. That is, between adjacent helical reinforcements 3 and 3, helical reinforcements 3 and 3 located on the left and right of the hose wall in the portion, and lengths L1 and L2 of hose walls between ribs 4 are different. One (L2) is longer than the other (L1). With such a configuration, the rib 4 formed to project from the hose wall 2 is formed so as to be naturally inclined with respect to the direction m orthogonal to the hose central axis l. In this embodiment, the rib 4 is formed from the center of the hose wall sandwiched by the spiral reinforcements so that the angle α between the direction m orthogonal to the hose central axis l and the extending direction of the rib 4 is about 15 degrees. Is located slightly offset to the left.

The said vacuum cleaner hose 1 can be manufactured by a well-known hose manufacturing method. That is, as schematically shown in FIG. 2, a so-called hose spiral forming method is applied, and a predetermined shape is provided so as to straddle the spiral reinforcing bodies 3 and 3 which are spirally formed on the hose forming axis. The spiral reinforcing body 3 is formed by winding the synthetic resin strip T2 extruded in a cross-sectional shape in a spiral shape and forming the hose wall 2 (rib 4) while welding the both side edges of the synthetic resin strip T2 to each other. , And 3 by welding, the hose 1 for a vacuum cleaner of the first embodiment can be manufactured.

The operation and effects of the vacuum cleaner hose 1 of the first embodiment will be described.
First, the vacuum cleaner hose 1 has a corrugated corrugated hose wall and is highly stretchable.

Moreover, since the hose for electric vacuum cleaners 1 of the said 1st Embodiment is integrally molded so that a rib may protrude inside a hose along the part which a hose wall indents inside a hose, a squeal occurs. It is difficult to do.

According to the inventors of the present invention, a conventional hose having a corrugated corrugated hose has a high frequency noise (so-called "peep" noise when the flow velocity of the air flowing in the hose increases while the hose is bent). There is a tendency for peeing) to occur easily. Also, this squealing noise may be easily generated when the hose is bent at a small bend R. This noise is annoying and under normal conditions of use of the vacuum cleaner, it is required that no squeaking occurs.

The pee sound suppression effect is illustrated.
The hose 1 for a vacuum cleaner of the first embodiment was manufactured and used as the hose of Example 1 in which the nominal diameter d of the hose was 35 mm and the protruding height of the rib was 1.5 mm. On the other hand, a hose having the same configuration as that of the hose of Example 1 except that the rib 4 was not provided was manufactured as a hose of Comparative Example 1. With respect to these hoses, as shown in FIG. 3, a part of the hose is rounded and arranged by bending so as to form a circle with an outer diameter D = 120 mm, and in that state, The flow rate Q was increased to compare the presence or absence of a beep sound. In this test, no squeaking noise is generated, but even if squeezing noise is generated, it can be said that the squeezing noise is more effectively suppressed if the squeaking noise is generated when the flow rate is increased.

In the test of Comparative Example 1, a loud noise occurred at a flow rate of 0.85 times the rated flow rate Q0 required for the hose. On the other hand, in the hose 1 for a vacuum cleaner according to the first embodiment, no generation of a beep sound was observed until the rated flow rate Q0, and no beep sound was observed even at 1.5 times the rated flow rate Q0. Furthermore, no squeaky noise was observed even when testing was performed at 1.85 times the rated flow rate, which is the maximum flow rate of the tester. That is, in the vacuum cleaner hose of the first embodiment, it is difficult for a beep to occur.

Although the details of the mechanism by which the generation of the phi sound is suppressed by providing the rib 4 is unknown, the inventors speculate that the generation of the phi sound may be suppressed by the following principle. There is.

The occurrence of squealing is related to the bending of the hose and the flow velocity of the air flow. Therefore, the inventors have found that the phenomenon of peeing is generated as the air flow enters and leaves the wave-shaped portion because the inner circumference of the hose is in a concavo-convex wave shape, and the movement is amplified as it goes downstream. It becomes intense, and if it becomes more than a specific flow velocity, it will resonate violently, and it is speculated that a beep may occur. In particular, when the bending R is reduced, the air flow in the hose is sprayed to the uneven wave shape of the hose wall located outside the bending R, and it is presumed that this phenomenon is likely to occur. doing.

In the vacuum cleaner hose provided with the conventional uneven corrugated hose wall as in Comparative Example 1, the air flow in the hose is along the uneven corrugated hose wall as shown in FIG. The serpentine flow so as to enter the space between the corrugations, and the flow appears periodically in synchronization with the pitch of the concavo-convex wave, so if it reaches a specific flow velocity, it may become a violent resonance phenomenon. Infer.

On the other hand, when the rib 4 is integrally formed so as to protrude inside the hose as in the hose of the first embodiment, the flow in the hose is from the hose wall by the function of the rib 4 as shown in FIG. It peels off and flows in a straight line substantially parallel to the hose axis, and it is estimated that the degree of meandering of the flow in the hose is reduced. As described above, by providing the ribs 4, it is difficult to generate periodic meandering of the flow in the hose, and it is presumed that a violent resonance phenomenon (the generation of a loud noise) may not occur.

From the viewpoint of changing the flow in the vicinity of the hose wall to suppress the generation of squeaking noise, the height of the rib 4 may be about 0.5 mm to 2.5 mm in a normal vacuum cleaner hose preferable. Further, in relation to the depth of the uneven wave shape of the hose wall, it is preferable that the height of the rib 4 be about 1/4 to 3/4 of the depth of the uneven wave shape of the hose wall. Further, in relation to the diameter of the portion where the hose wall has entered inside, ie, the minimum diameter, it is preferable that the height of the rib 4 be about 1/30 to 1/5 of the minimum diameter of the hose wall .

The invention is not limited to the above embodiment, and can be implemented with various modifications. Other embodiments of the present invention will be described below. In the following description, parts different from the above embodiment will be mainly described, and the detailed description of the same parts will be omitted. In addition, the embodiments described below can be implemented by combining some of them with each other or replacing some of them.

In FIG. 6, sectional drawing of the hose wall part of the hose 5 for vacuum cleaners of 2nd Embodiment is shown. In the present embodiment, the configurations of the hose wall 52 and the helical reinforcing body 53 are the same as those of the first embodiment. In the vacuum cleaner hose 5 of the present embodiment, the projecting form of the rib 54 is different, and the rib 54 is substantially parallel to the direction m orthogonal to the hose central axis l when viewed in a cross section including the hose central axis l. It is protrudingly formed. In the portion of the hose wall sandwiched by the spiral reinforcements 53, 53, the rib 54 is provided at the center position of the hose wall portion.

Even with the vacuum cleaner hose 5 of the second embodiment, the effect of suppressing the generation of a beep can be recognized. The hose 5 for electric vacuum cleaners of 2nd Embodiment which manufactured the protrusion direction and arrangement | positioning of the rib with respect to Example 1 mentioned above was manufactured, and was used as the hose of Example 2. FIG. A similar buzzing sound generation test was conducted on the vacuum cleaner hose 5 of Example 2. As a result, no buzzing sound was not observed up to the rated flow rate Q0, and a buzzing sound was generated even 1.5 times the rated flow rate Q0 Was not seen. Furthermore, when the flow rate was increased, a beep sound occurred at 1.75 times the rated flow rate.

When the test results of Example 1 and Example 2 are compared, the rib protruding and formed on the inner side of the hose wall suppresses the generation of squeal when the rib is provided to be inclined with respect to the direction orthogonal to the central axis of the hose. It is preferable from the viewpoint of Alternatively, the rib projecting inside the hose wall may be provided at a position offset from the center of the hose wall portion between the helical reinforcements in the portion of the hose wall sandwiched by the helical reinforcements. It is preferable from the viewpoint of generation | occurrence | production suppression of loud noise.

Further, as in Example 1, when ribs are provided at positions offset from the center of the hose wall portion between the helical reinforcements, the ribs are formed so as to be naturally inclined when the hose is formed, The production of such hoses is easy and advantageous from the point of view of hose quality control and is preferred.

The form of the rib protruding from the hose wall may be rectangular as in the above embodiment, but may be another form as shown in FIG.
The cross-sectional shape of the rib may be a triangle having an acute angle at its tip, such as the rib 4a shown in FIG. 7 (a). Alternatively, the cross-sectional shape of the rib may be R-shaped at the end, such as the rib 4 b shown in FIG. 7 (b). Alternatively, the cross-sectional shape of the rib may be a shape such as the rib 4c shown in FIG. 7 (c) in which the corner of the tip of the rib has an acute angle.

Among these ribs, the cross-sectional shape of the rib is the tip of the rib as in the ribs 4a and 4c shown in FIG. 7A and FIG. 7C so that the above-mentioned noise suppressing effect is more easily exhibited. It is preferable that the corners of the angle be 90 degrees or acute. By setting the angle of the corner of the rib tip to be 90 degrees or an acute angle, it is presumed that the air flow in the hose peels off at this corner and becomes easy to flow in a straight line, and the squeak noise suppressing effect is enhanced.

Also, as in the case of the rib shown in FIG. 7B, when R is applied to the tip of the rib, the thickness of the rib 4b (width of the rib in the horizontal direction of the figure) It is preferable that the thickness be approximately the same as the length or the thickness be smaller than the length of the rib in the vertical direction of It is presumed that the tip end of the rib peels off easily and flows straight, and the squeak noise suppressing effect is further enhanced.

In FIG. 8, sectional drawing of the hose wall part of the hose 6 for vacuum cleaners of 3rd Embodiment is shown. In the present embodiment, the configuration of the hose wall 62 and the rib 64 is substantially the same as that of the second embodiment. The vacuum cleaner hose 6 of the present embodiment does not have a helical reinforcing body. The hose 6 of the present embodiment is manufactured by spirally winding a resin strip having a substantially S-shaped cross section and bonding and integrating so that both side edges of the strip overlap one another to form a hose wall. it can. The helical reinforcement is not essential as long as the form of the vacuum cleaner hose can be maintained without the helical reinforcement. Also in the vacuum cleaner hose 6 of the present embodiment, the noise suppressing effect can be obtained.

INDUSTRIAL APPLICABILITY The vacuum cleaner hose of the present invention can be used for household vacuum cleaners and industrial vacuum cleaners, and has a high industrial value.

DESCRIPTION OF SYMBOLS 1 Hose for electric vacuum cleaners 2 Hose wall 3 Helical reinforcement 4 Rib T2 Synthetic resin strip 5, 6 Hose 52, 62 for electric vacuum cleaner Hose wall 53 Spiral reinforcement 54, 64, 4a, 4b, 4c Rib

Claims (2)

What is claimed is: 1. A vacuum cleaner hose having a corrugated corrugated hose wall, comprising:
The rib is integrally formed so as to protrude inside the hose along a portion where the hose wall is recessed inside the hose,
The rib does not substantially cover the space along the ridges and ridges of the hose wall where the hose wall exists inside the portion formed projecting toward the outside of the hose .
The rib is provided to be inclined with respect to the direction orthogonal to the central axis of the hose when viewed in a section including the central axis of the hose, and
The corrugated wall of the hose wall is provided in a spiral shape, and along the portion where the hose wall protrudes to the outside of the hose, a helical reinforcement is provided on the inner peripheral surface of the hose wall, and the helical reinforcement The rib is provided at a position offset to the downstream side of the air flow in the hose from the center of the hose wall portion in the pinched portion of the hose wall.
Vacuum cleaner hose. The hose for a vacuum cleaner according to claim 1, wherein a helical reinforcing body made of a material harder than a material constituting the hose wall is provided along a portion where the hose wall protrudes to the outside of the hose.

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