JPH0226438Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a vacuum cleaner.

(Prior Art) The structure of a conventional vacuum cleaner will be explained with reference to FIGS. 3 and 4. The vacuum cleaner main body 1 is composed of front and rear cases 3 and 4 which are separably connected by a clamp mechanism 2. The front case 3 is equipped with a swivel wheel 5 on the bottom, and the rear case 4 is equipped with running wheels 6 on both sides. do. The front case 3 has a connection port 7 on the front surface for connecting a suction hose (not shown), and has a prefilter 9 and a main filter 10 inside.
It is equipped with a detachable dust collection unit 8 consisting of: The rear case 4 has ventilation holes 11 and 12 on the front and rear surfaces, respectively.
At the same time, an air passage 13 connecting both the vent holes 11 and 12 is formed inside, and the vent hole 12 is provided with a thin breathable member 14 made of soft urethane.
has been set up.

The electric blower 15 includes a motor 16, a fan 17 rotated by the motor, and a fan casing 18 having an intake port 19. A vibration-proof rubber 20 is installed in the air passage 13 so that the side surface of the intake port 19 of the fan casing 18 faces the ventilation port 11. The vent hole 11 is provided with a large number of ribs 32 vertically and horizontally to form a lattice-like structure.

In addition, in FIGS. 3 and 4, 26 is a soundproof material attached to the outer periphery of the motor 16, 27 is a cord reel, and 2
8 is a handle of the front case 3, 29 is a handle of the rear case 4, 30 is a main body switch that controls the electric blower 15, and 31 is a dust collection meter.

In the above configuration, when the electric blower 15 is operated, the dust-collecting airflow sucked in through the suction port and the suction hose (none of which are shown) is filtered by the dust collection unit 8 to become a clean airflow, and then ventilated. Mouth 1
1. The air is discharged outward from the vent 12 via the intake port 19, the fan casing 18, and the air passage 13.

(Problem to be solved by the invention) By the way, in the conventional configuration, since the vent 11 is only provided with a large number of ribs 32 vertically and horizontally, the fan 1
Noise caused by high speed rotation of fan casing 18
When the fan casing 18 exits from the intake port 19, it spreads into the front case 3 through the ventilation port 11, increasing the noise.The ribs 32 also prevent fingers or rod-shaped foreign objects from being inserted into the fan casing 18. Therefore, it is necessary to narrow the spacing between each other and provide a large number of them vertically and horizontally.
Air flow flowing toward the center from the vent 11 and the rib 3
There is also the problem that large wind noise is generated due to the two crossing each other, and sufficient noise countermeasures have not been taken on the suction side of the electric blower 15.

However, in the present invention, sufficient noise countermeasures are taken on the suction side of the electric blower to reduce the noise.

(Means for Solving the Problems) The present invention includes an electric blower having a fan casing, and a case of a vacuum cleaner body in which the electric blower is housed, and a wall surface of the case facing the air intake port of the fan casing. , in a vacuum cleaner having a vent larger than the intake port through which the air flow sucked by the electric blower passes, the vent has a central portion of the fan casing facing the intake port as a closed part having a diameter larger than the intake port; A sound absorbing member is attached to the surface of the closing portion facing the intake port, and ribs are provided extending radially from the outer periphery of the closing portion.

(Function) With the above configuration, the noise emitted from the intake port of the fan casing when the fan rotates at high speed is effectively absorbed by the sound absorbing member located opposite the intake port, and does not spread directly through the ventilation port. . In addition, since the insertion of fingers or rod-shaped foreign objects into the inside of the fan casing can be prevented by the blocking part, the spacing between the ribs can be increased.Furthermore, by providing the ribs in the radial direction, it is possible to increase the distance between the ribs from the outer periphery of the vent toward the center. The ribs do not intersect with the airflow flowing through the ribs, and therefore the generation of wind noise due to the ribs is reduced.

(Example) Hereinafter, the example of the present invention shown in FIGS. 1 and 2 will be described in detail. Note that in FIGS. 1 and 2, parts common to those in FIGS. 3 and 4 are given the same reference numerals.

1 and 2, the rear case 4 has a plurality of ribs 21 extending in the radial direction at the vent 11, an annular rib 22, and a plurality of ribs 23 extending in the radial direction from the outer periphery of the rear case 4. The annular rib 22 is formed to have a diameter larger than the diameter of the intake port 19, and the annular rib 22 and the intake port 19 are opposed to each other. Further, a non-breathable sound absorbing member 24 made of urethane with a skin 24' adhered to one side is installed inside the annular rib 22, and this portion is used as a closing portion 25. The sound absorbing member 24 is a skin 24'
is installed in the annular rib 22 with the adhesive surface facing outside (the side opposite to the intake port 19). The sound absorbing member 24 is not limited to urethane with a skin 24', and other suitable materials such as nonwoven fabric may be used.

With the above configuration, from the ventilation port 11 to the intake port 19
Since the central part of the vent 11 is the closed part 25, the airflow flowing towards the vent 11 is a flow from the outer periphery of the vent 11 toward the center, that is, a flow parallel to the ribs 23 extending in the radial direction. 23 can be suppressed to a low level. Moreover, the noise accompanying the high-speed rotation of the fan 17 is absorbed by the sound absorbing member 24 at the time it exits the intake port 19, and is suppressed to a small level.

Note that the closing portion 25 may be formed as a blind wall inside the annular rib 22 during molding of the rear case 4, and in such a case, the sound absorbing member 24 is installed on the surface of the blind wall facing the intake port 19.

FIG. 5 is a diagram showing noise characteristics of a vacuum cleaner according to an embodiment of the present invention and a conventional vacuum cleaner. The values shown in Figure 5 are the values measured using the measurement method specified by the Japanese Industrial Standards, and the microphones were placed 1 m above and 1 m to the side of the vacuum cleaner body. Shows average value. As can be seen from Fig. 5, the noise of the vacuum cleaner of the present invention is lower than that of conventional vacuum cleaners regardless of the A characteristic, B characteristic, C characteristic, etc., and especially in the A characteristic, the noise of the present invention is lower than that of the conventional vacuum cleaner. A favorable result was obtained, which was lower at 56.3 phons compared to 57.6 phons.

(Effects of the invention) According to the invention configured as described above, the insertion of a finger or a rod-shaped foreign object into the inside of the fan casing can be reliably prevented by the closure part, and the sound absorbing member attached to the closure part can prevent the fan casing from being inserted. It is possible to absorb the noise emitted from the inside through the intake port and suppress the spread of that noise. Furthermore, the ribs are spaced apart from each other and placed in the radial direction, so there is less wind noise caused by the ribs. It is possible to reduce noise on the suction side of the blower.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional configuration diagram of a vacuum cleaner according to an embodiment of the present invention, Fig. 2 is a perspective view of the same vent section, Fig. 3 is a cross-sectional configuration diagram of a conventional vacuum cleaner, and Fig. 4 is a cross-sectional diagram of the same vent section. The perspective view and FIG. 5 are diagrams showing the noise characteristics of the vacuum cleaner according to the embodiment of the present invention and the conventional vacuum cleaner. 1... Vacuum cleaner body, 3... Rear case, 11...
Vent, 15...Electric blower, 17...Fan,
18...Fan casing, 19...Intake port, 2
3...Rib, 24...Sound absorbing member, 25...Closing portion.

Claims (1)

[Scope of utility model registration request] An electric blower having a fan casing and a case of a vacuum cleaner body in which the electric blower is installed are provided, and a suction air flow from the electric blower passes through a wall surface of the case opposite to an air intake port of the fan casing, which is larger than the air intake port. In the case where a vent is formed, the vent has a central portion facing the intake port of the fan casing as a closed portion having a larger diameter than the intake port, and a sound absorbing member is provided on the surface of the closed portion facing the intake port. A vacuum cleaner characterized by being provided with ribs that are attached and extend in a radial direction from the outer periphery of the closing part.