JPS6340209Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The invention of this application relates to a vacuum cleaner equipped with an electric blower, and particularly to noise prevention thereof.

[Prior Art] A conventional vacuum cleaner has a configuration as shown in FIG. 4, for example.

In the figure, 10 is an electric blower, 11 is an exhaust port of the electric blower 10, 27 and 28 are sound absorbing cushions, 2 is an exhaust port, 29 is a cord winding device, and 31
is the rear wheel, 13 is the anti-vibration rubber, 32 is the support rib, 3
3 is a reinforcing rib. In such a conventional vacuum cleaner, air taken in from the front surface of the electric blower 10 is exhausted from the exhaust port 11, and this exhaust air is exhausted from the exhaust port 2 via the sound absorbing cushions 27 and 28.

Further, the support ribs 32 are for supporting the rear part of the electric blower 10 via the vibration isolating rubber 13, and the reinforcing ribs 33 are for resisting shocks such as drops.

[Problems to be solved by the invention] In the conventional vacuum cleaner shown in FIG. 4, the support ribs 32 increase the weight, and the exhaust port 11
There was a problem in that the exhaust gas generated from the exhaust generated a vortex and generated noise before reaching the exhaust port 2.

That is, the exhaust flow discharged from the exhaust port 11 passes through the sound absorbing mat 27 and then flows toward the exhaust port 2. In this flow of exhaust air, the part corresponding to the back of the electric blower 10 is a part of the air flow. It becomes a dead space. Therefore, exhaust port 11
A vortex is generated at the back of the electric blower 10 by the high velocity flow of air discharged from the electric blower 10. In other words, this dead space is depressurized by the surrounding high-speed flow, and this causes a vortex to be generated.
Regarding the reduced pressure around the high-speed flow,
This is well known from Bernoulli's theorem.

[Means for Solving the Problems] The vacuum cleaner according to this invention includes a case 3 having an inlet 4 and an outlet 2, and a front part of the case 3 that is housed in the case 3 with a vibration-proof rubber 12 interposed therebetween. An electric blower 1 is supported by a case and takes in air from the intake port 4 through an intake port provided at the front of the case and exhausts air from an exhaust port 11 provided at the rear thereof.
0, a cylindrical sound insulating tube 14 having an exhaust passage formed therein that connects the space around the outlet 11 of the electric blower 10 with the outlet 2, and the sound insulating tube 1.
4, and the front side is the electric blower 1.
a partition wall 15 that is formed into a large-diameter cylindrical shape so as to cover the exhaust port 11 of the engine 0, has a closed rear end face, and has a substantially U-shaped cross section that partitions the exhaust passage into a front opening chamber 16 and a rear opening chamber 17; a sound absorbing cushion disposed between the inner circumferential surface of the sound insulating tube 14 and the outer circumferential wall of the large diameter cylindrical portion of the partition wall 15 so as to close the exhaust passage; and a sound absorbing cushion provided on the partition wall 15; An intermediate opening 20 that communicates the front opening chamber 16 and the rear opening chamber 17, and a support hole 18 that is provided approximately in the center of the rear end surface of the partition wall 15 and supports the rear part of the electric blower 10 via a vibration isolating rubber 13. , a holding part 21 whose rear end is supported by a cylindrical part 23a provided on a rear wall surface 23 having the discharge port 2 of the case 3 via a vibration isolating rubber 22, and whose front end is fixed to the rear end surface of the partition wall 15; The holding part 21 supports the electric blower 10 and occupies a space in the center of the rear opening chamber 17.

[Function] According to the vacuum cleaner of this invention as described above,
The rear part of the electric blower 10 is held by a holding part extending from the rear surface of the case. Therefore, the electric blower can be held securely. In addition, the holding part 21
occupies the central portion of the rear opening chamber 17 inside the sound insulating cylinder. Therefore, dead space in the high-speed exhaust flow is substantially eliminated by the holding portion 21. Therefore, it is possible to effectively prevent the generation of vortices and the noise generated therefrom.

[Example] An example of this invention will be described below with reference to FIGS. 1 to 3.

Reference numeral 1 denotes a main body case, which is composed of a rear case 3 having a discharge port on a rear wall surface 23, and a front case 5 having an inlet port 4 on the front wall surface, which is detachably attached to the rear case 3 having a discharge port on the rear wall surface 23.

6 is a filter for capturing dust housed in the front case.

Further, the rear case 3 is divided into left and right cases 3a and 3b, and an intake chamber 7, a blower chamber 8, and a cord winding chamber 9 are formed inside the rear case 3.

Reference numeral 10 denotes an electric blower having an intake port (not shown) and an exhaust port 11, to which a front vibration-proofing rubber 12 and a rear vibration-proofing rubber 13 are attached, and is fixed to the rear case. That is, the electric blower 10 has a vibration-proof rubber 12 at the front.
The rear part is supported on the rear wall surface 23 of the case 1 via the rear vibration isolating rubber 13, the holding part 15, and the holding vibration isolating rubber 22.

Furthermore, a partition wall 15 having a U-shaped cross section is arranged inside the sound insulating tube 14 . The partition wall 15 is formed into a large-diameter cylindrical shape so that its front side covers the discharge port 11 of the electric blower 10. Further, the rear end face is closed to form a front opening chamber 16 that covers the exhaust port of the blower 10. The partition wall 15 forms a rear opening chamber 17 as an exhaust passage communicating with the exhaust port 2 provided in the rear case 3 inside the sound insulation chamber 14 . Further, the partition wall 15 includes a front opening chamber 16 and a rear opening chamber 1.
An intermediate opening 20 is formed for communicating with each other.

Further, the front edge of the front opening chamber 16 of the sound insulating tube 14 is detachably supported by an engaging portion 10a formed on the side surface of the blower chamber 8 of the electric blower 10 via a packing 19. Further, the rear center portion of the electric blower 10 is supported in a support hole 18 formed approximately at the center of the partition wall 15 via a rear vibration isolating rubber 13. Furthermore, one end of the holding part 21 formed in the rear opening chamber 17 is fixed to the central part of the partition wall 15, and the other end of the holding part 21 is connected to a rear wall surface 23 having an outlet of the rear case 3.
The rear part of the electric blower 10 is supported on the rear wall surface 23a of the rear case 3 by being supported via the cylindrical part holding vibration isolating rubber 22. In addition, since the partition wall 15 and the holding part 21 are locked and supported by the rear case 3 in this way, the rear case 3 can be attached to the left and right cases 3.
When divided into a and 3b, this partition wall 15
The holding portion 21 is released from the lock and can be separated. The holding portion 21 occupies the central portion of the rear opening chamber 17 and substantially eliminates a portion that becomes a dead space for air flow.

Further, 24 is a groove formed in the rear wall surface 23a of the left case 3a, and 25 is the rear wall surface 23 of the right case 36.
b has a convex embossment, and is inserted into the groove 24 and integrated with the left case 3a.

A relay 26 electrically controls the electric blower 10, and is housed in the holding section. Holding part 2
Since exhaust gas is not circulated within the relay 1, there is no adverse effect on the relay 26.

27 is a sound absorbing cushion attached to the sound insulating tube 14, and 27a is a sound absorbing cushion provided on the inner surface of the large diameter portion of the partition wall 15 through which the exhaust gas that has passed through the intermediate opening 20 passes.

Note that 29 is a cord winding device housed in the cord winding chamber 9, 30 is a front wheel, and 31 is a rear wheel.

Further, the sound-absorbing cushion 27 is disposed inside the sound-insulating tube between its inner circumferential surface and the outer circumferential wall of the large-diameter cylindrical portion of the partition wall 15, so as to close the exhaust passage. Therefore, dust removal and sound absorption are achieved in this sound absorbing cushion 27.

As described above, according to the device of this embodiment, the holding portion 21 is formed at the back side of the electric blower 10 and the partition wall 15. Therefore, a portion of the rear opening chamber 17 that corresponds to a dead space for air flow is substantially eliminated. Therefore, no vortices are generated around the high-speed airflow. Therefore, it is possible to effectively prevent the generation of noise caused by the eddy current.

Furthermore, since the electric blower 10 can be supported by the holding part 21 supported by the rear case 3, the electric blower 10 can be held securely and the overall weight can be reduced.

[Effects of the invention] As explained above, according to the vacuum cleaner according to the invention, no vortex is generated while the exhaust air from the electric blower reaches the exhaust port on the rear wall surface, and no noise is generated. Additionally, in the past, it was necessary to install a dedicated support wall to support the rear side of the electric blower.
This can be omitted and the rear case can be directly supported on the rear wall surface, so the configuration can be simplified and the weight can be reduced.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention,
1 is an overall front view, FIG. 2 is a vertical sectional view of the rear case, FIG. 3 is a sectional view taken along line -3 in FIG. 2, and FIG. 4 is a sectional view showing a conventional example. In the figure, 2 is an outlet, 3 is a case, 4 is an inlet, 10 is an electric blower, 11 is an outlet, 14 is a sound insulation tube, 15 is a partition wall, 16 is a front opening chamber, 17
is the rear opening chamber, 18 is the support hole, 22 is the anti-vibration rubber, 2
3 is a cylindrical portion. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] A case 3 having an inlet port 4 and an outlet port 2; An electric blower 10 that takes in air from the suction port 4 through a provided intake port and exhausts air from a discharge port 11 provided at the rear, and a space around the discharge port 11 of the electric blower 10 and the discharge port 2. A cylindrical sound insulating tube 14 having a communicating exhaust passage formed therein, and a large diameter cylindrical shape provided inside the sound insulating tube 14 so as to cover the exhaust port 11 of the electric blower 10 on the front side. At the same time, the rear end surface is closed, and the exhaust passage is connected to the front opening chamber 16 and the rear opening chamber 17.
A partition wall 15 having a substantially U-shaped cross section, and an inner circumferential surface of the sound insulating tube 14 and an outer circumferential wall of the large-diameter cylindrical portion of the partition wall 15 are arranged so as to close the exhaust passage. an intermediate opening 20 provided in the partition wall 15 and communicating the front opening chamber 16 and the rear opening chamber 17; A support hole 18 that supports the rear part of the electric blower 10, and a rear wall surface 23 whose rear end has the discharge port 2 of the case 3.
A holding part 21 is supported by a cylindrical part 23a provided in the partition wall 15 via a vibration isolating rubber 22, and the front end is fixed to the rear end surface of the partition wall 15. A vacuum cleaner characterized in that it supports the vacuum cleaner and occupies a central space in the rear opening chamber 17.