JPS6325775B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a vacuum cleaner, and particularly to a noise reduction structure for reducing noise caused by exhaust air from an electric blower.

[Prior art]

In general, vacuum cleaners have a structure in which the exhaust air from the electric blower is discharged outside from the exhaust port on the rear end of the vacuum cleaner, so there is a gap between the electric blower located at the rear and the exhaust port. The length of the connecting exhaust passage is short, and noise caused by exhaust air is a problem.

Therefore, in the past, the exhaust passage was detoured around the electric blower by forming a partition wall or a partition plate inside the vacuum cleaner body to increase the length of the exhaust passage, or a sound deadening material was placed in the exhaust passage. By inserting it, they were trying to reduce the noise caused by the exhaust air.

[Problem that the invention seeks to solve]

However, in the above structure, a partition wall, a partition plate, etc. must be formed inside the cleaner body in order to increase the length of the exhaust passage, and the shape of the cleaner body itself becomes complicated. In particular, as vacuum cleaners become more and more compact, the space required for noise reduction becomes smaller, which makes the structure of the vacuum cleaner more complex and difficult to manufacture. Even when using sound deadening materials and forming exhaust passages, it was not possible to expect a sufficient sound deadening effect due to space constraints.

[Means for solving problems]

The present invention includes a vacuum cleaner body in which a filter and an electric blower are installed as shown in the drawings, and
A rectifying tube having a U-shape in plan, having an intake port that matches the exhaust port formed on the rear end surface of the vacuum cleaner body, and extending along both side walls of the vacuum cleaner body on both sides thereof, is provided. Exhaust ports are formed at the front ends of both sides of the tube, and a sound absorbing material is provided inside the straightening tube at a position facing the intake port and where the exhaust air from the electric blower collides with the exhaust port. A sound insulating material with good air permeability is provided so that the exhaust air from the electric blower is discharged through the rectifying cylinder.

[Effect]

According to the present invention, it is sufficient to attach a pre-formed planar U-shaped rectifier tube from the outside of the vacuum cleaner body, and the exhaust passage can be lengthened inside the vacuum cleaner body, which is space-constrained as in the past. There is no need to form bulkheads or partition walls for this purpose, and the fabrication is extremely simple, the rectifying passage can be made sufficiently long, and sound-absorbing and sound-insulating materials can be installed in advance inside the rectifying cylinder. This makes it easier to divide labor on the production line, which in turn helps reduce costs.

Regarding the noise reduction effect, according to the present invention, the rectifying passage can be easily made longer as described above, and the wind speed is weakened by dividing the exhaust air from the electric blower into left and right halves, thereby reducing wind noise. It can be attenuated to a large extent,
Moreover, although the sound-absorbing and sound-insulating materials are placed only partially, effective positioning for noise countermeasures can alleviate the sound of the exhaust air colliding with the inner surface of the straightening tube and attenuate the noise leaking outward from the inside of the straightening tube. It can be done effectively.

〔Example〕

Embodiments of the present invention shown in the drawings will be described in detail below.

In FIGS. 1 to 6, a vacuum cleaner main body 1 is composed of an upper case 2 and a lower case 3, and has running wheels 4 on both sides of the rear part and swivel wheels 5 on the bottom surface of the front part. A storage chamber 6 having an opening on the top surface is formed at the front of the vacuum cleaner body 1, and a suction tube body 7 for connecting a dust suction hose (not shown) is disposed on the front wall of the storage chamber 6. ing.

A dust collection case 8, which is a dust collection part, is housed in the storage chamber 6 so as to be able to enter and exit the storage chamber 6 through its upper opening. The lid 9 is arranged to be openable and closable, and a main filter 11 is airtightly fitted to the rear end opening with a packing 12 on the outer periphery, and a pre-filter 13 is installed between the dust suction port 10 and the main filter 11. are placed. Then,
In the stored state, the dust collection case 8 forms an air passage from the suction cylinder body 7 to the ventilation port 14 on the rear wall of the storage chamber 6 via the dust suction port 10, the prefilter 13, and the main filter 11. The top opening of the storage chamber 6 is opened and closed by a top lid 15 pivotally mounted on the cleaner body 1.

Further, the vacuum cleaner main body 1 is divided into a cord reel chamber 16 and a ventilation chamber 17 on the left and right at a rear position of the storage chamber 6, and a cord reel 18 is installed inside the cord reel chamber 16. On the other hand, an electric blower 19 is internally supported in the ventilation chamber 17 using anti-vibration rubber 20 and 21, and the suction side of the fan is located opposite to the ventilation port 14, and the exhaust side is located on the rear end surface of the vacuum cleaner body 1. It is located opposite to the exhaust port 22. Electric blower 19
A sound deadening material 23 such as urethane foam is wrapped around the outer periphery of the motor portion, and the sound deadening material 23 is supported by a porous sound deadening plate 24 made of a material such as rubber.

The rectifier tube 25 has a U-shape in plan and is disposed spanning from the rear end surface of the vacuum cleaner main body 1 to near the front ends of both side surfaces. An intake port 26 communicating with the exhaust side of the electric blower 19 is formed, and exhaust ports 27, 27 are formed on the lower surface of both front ends. The rectifier tube 25 is housed in a groove 28 of the vacuum cleaner body 1, with its outer circumferential portion slightly protruding outward.In this embodiment, the rectifier tube 25 is made of a low foam material such as polyurethane or soft vinyl chloride. By forming the rectifying cylinder 25 using an elastic material such as resin, the rectifying cylinder 25 itself can also be used as a shock absorbing bumper. The groove 28 is on the top,
It is located between the lower cases 2 and 3 and is formed spanning from the rear end surface of the vacuum cleaner body 1 to near the front end of both sides.
A distributed exhaust port 29 extending to the bottom surface of the cleaner body 1 and having a plurality of rectifying ribs 30, 30 arranged in parallel is formed on the lower surface of the front end surface.
It matches the exhaust port 27 of.

On the other hand, a sound absorbing material 31 and a sound insulating material 32 are partially provided inside the rectifying cylinder 25. The above sound absorbing material 31
is made of a soft material such as soft foamed polyurethane foam or felt, and is attached to the inner surface of the rectifier tube 25 facing the intake port 26, that is, the area where the exhaust air from the electric blower 19 collides most vigorously, thereby mitigating the collision noise. Acts as a wind noise absorber. The soundproofing material 32 is made of a material with good air permeability, such as soft polyurethane foam, and is bent into a U-shape within the front end of the flow straightening tube 25 to close the exhaust port 2.
7 and the front end surface of the straightening tube 25, and exerts an effect of attenuating the noise leaking outward from the inside of the straightening tube 25 through the exhaust port 27 and mitigating the collision sound of the exhaust air at the front end surface.

In the embodiment of the above configuration, the electric blower 19
When the is driven, air containing dust enters the dust collecting case 8 through a suction port (not shown), a dust suction hose, the suction cylinder body 7, and the dust suction port 10, and inside this case, the coarse dust is collected by the prefilter 13 and transferred to the main filter 11. After each fine dust is collected and removed and purified, it is sucked into the electric blower 19 through the vent 14, and the dust is accumulated in the dust collection case 8. Then, the air discharged from the electric blower 19, that is, the exhaust air, passes through the sound deadening material 23 and the porous sound deadening plate 24, enters the straightening tube 25 from the wind exhaust port 22 through the intake port 26, and due to collision with the sound absorbing material 31. The air is divided into left and right parts and flows into the straightening tube 25, passes through the soundproofing material 32, and is discharged from the exhaust ports 27, 27 to the distributed exhaust ports 29, 29 to the outside of the machine. Since the rectifier cylinder 25 has a sufficient dimensionally length, it can exert a sufficient rectifying effect on the flow of exhaust air, and the wind speed is weakened due to the flow being divided to the left and right. This means that wind noise can be greatly attenuated, and although the sound absorbing material 31 and the sound insulating material 32 are only partially disposed, effective positioning in terms of noise countermeasures reduces the noise of the exhaust air colliding with the inner surface of the rectifying tube 25. It is possible to effectively attenuate the noise leaking outward from the inside of the rectifier cylinder 25,
8th compared to the one without sound absorbing material 31 and sound insulating material 32.
As shown in the figure, the noise can be reduced, and the overall noise can be significantly reduced. FIG. 8 is a noise comparison measurement diagram with and without sound absorbing material and sound insulating material, where A shows the noise characteristics of an example of the present invention, and B shows the noise characteristics without sound absorbing material and sound insulating material.

FIG. 7 shows another embodiment of the present invention, in which the rectifier cylinder 25
The wall surface of the end on the side of the exhaust port 27 is formed into an arcuate surface 25', and the end of the rectifying rib 30 is also formed into the surface 25'.
It is curved in an arc shape to match. Then,
In this case, the flow direction of the exhaust air can be changed gently, which is more preferable in terms of noise suppression.

〔effect〕

Since the present invention is constructed as described above, the present invention does not require the formation of partition walls or partition plates to lengthen the exhaust passage inside the vacuum cleaner body, which is space-restricted. A pre-molded rectifying tube can be easily attached, making it easy to manufacture, and the rectifying passage can be made with a simple structure that is sufficiently long. Since it is possible to attach materials, it is easy to divide labor, which in turn reduces costs.Furthermore, the noise reduction effect is that by dividing the exhaust air into left and right halves, the wind speed is weakened and wind noise can be greatly attenuated. Furthermore, by effectively setting the position of sound absorbing and sound insulating materials, it is possible to further reduce noise, making it possible to achieve low noise even when the vacuum cleaner itself is downsized. It can have many remarkable effects.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the vacuum cleaner of the present invention with the dust collection case taken out, Figs. 2 and 3 are cross-sectional views taken along lines A-A and B-B in Fig. 1, and Fig. 4 is the same as above. A top view of the vacuum cleaner main body with the case removed and a part shown in cross section, FIG. 5 is a bottom view of the same vacuum cleaner main body, FIG. 6 is a perspective view of the same rectifying tube, and FIG. 7 is another embodiment of the present invention. FIG. 8 is a cross-sectional view of a main part showing a noise comparison measurement diagram with and without a sound absorbing material and a sound insulating material. 1: Vacuum cleaner body, 11: Main filter, 1
3: Prefilter, 19: Electric blower, 25:
Rectifier tube, 26: intake port, 27: exhaust port, 31: sound absorbing material, 32: sound insulating material.

Claims (1)

[Scope of Claims] 1. A vacuum cleaner body with a filter and an electric blower installed therein, and an intake port that matches the exhaust port formed on the rear end surface of the vacuum cleaner body, and both sides of the vacuum cleaner body A rectifying tube with a U-shape in plan extending along both side walls is provided, and exhaust ports are formed at the front ends of both sides of the rectifying tube. A sound absorbing material is provided at a position where the exhaust air collides with the electric blower, and a sound insulating material with good ventilation is provided at the exhaust port, so that the exhaust air from the electric blower is discharged through the rectifying tube. A vacuum cleaner that features: 2. The electric appliance according to claim 1, wherein the exhaust port is formed on the other surface adjacent to both front end surfaces of the rectifying tube, and a soundproofing material is provided spanning from the exhaust port to the front end surface. Vacuum cleaner.