JP4620104B2 - Electric vacuum cleaner - Google Patents

Description

  The present invention relates to a vacuum cleaner provided with a vibration isolating support portion that insulates vibration generated by an electric case from a case that houses an electric blower.

  FIG. 6 is a partial cross-sectional view of a vacuum cleaner body that houses an electric blower of a conventional vacuum cleaner.

  As shown in FIG. 6, the conventional electric vacuum cleaner 40 described in Patent Document 1 includes a vacuum cleaner main body 2, an electric blower housing chamber 42 formed in the vacuum cleaner main body 2, and a tensile elastic support 43. The electric blower 10 is elastically supported and accommodated in the electric blower accommodation chamber 42.

  The tensile elastic support body 43 includes an inner ring 45 provided in the cleaner body 2, an outer ring 48 provided between the fan end face 46 and the mounting rib 47 formed near the center of gravity of the electric blower 10, and The coil spring 49 is a spring material in which one end is fixed to the inner ring 45 and the other end is fixed to the outer ring 48 and a tensile force is urged. The axial direction and the radial direction of the electric blower 10 are elastically supported by the tensile elastic support body 43.

  The fan part of the electric blower 10 is attached with a rubber-like, substantially cylindrical, elastic body 50 for shock absorption. On the inner wall of the cleaner body 2, a fixed annular front rib 51 and an end rib 52 projecting in the axial direction of the electric blower 10 are formed. The front rib 51 and the end rib 52 are separated from the front elastic body 50 by a gap 53.

  A rubber-like cylindrical shock absorbing rear elastic body 56 is attached to the bearing housing portion 55 of the motor portion 10 c of the electric blower 10. A rear rib 57 protrudes from the inner wall of the cleaner body 2 around the rear elastic body 56. The rear rib 57 and the rear elastic body 56 are separated by a gap 58.

  The suction port 10a of the electric blower 10 is provided with a disc-shaped seal 60 in which a cylindrical brim portion 59 is formed at the edge of a hole communicating with the suction port 10a. An end portion of the seal 60 is brought into contact with the partition plate 62 formed between the dust collecting portion 61 and the electric blower housing chamber 42 formed in the cleaner body 2.

  FIG. 7 is a diagram illustrating characteristics in the axial direction of an electric blower of an elastic support that elastically supports an electric blower of a conventional vacuum cleaner.

As shown in FIG. 7, the electric blower 10 elastically supported by the coil spring 49 of the tensile elastic support 43 has a nonlinear characteristic in the relationship between the force applied in the axial direction and the displacement. That is, the minute vibration applied in the axial direction of the electric blower 10 is flexibly supported by the coil spring 49, and a large force due to a static force generated by the suction force of the electric blower 10 or a drop impact on the vacuum cleaner body 2 or the like. Strong support for power.
Japanese Patent Laid-Open No. 5-84194

  The electric blower of the conventional vacuum cleaner described in Patent Document 1 is elastically supported in the vacuum cleaner main body by a coil spring biased by a tensile force, and the force acting in the radial direction is flexibly supported. Since the force acting in the direction is strongly supported as the axial displacement increases, vibration generated by the operation of the electric blower can be prevented from being transmitted to the cleaner body.

  However, in order to apply a tensile force to the coil spring, it is necessary to extend the coil spring beyond the free length. If it does so, when the space | interval of the wall surface of an electric blower accommodation chamber and an electric blower cannot fully be acquired, a coil spring cannot be extended and an electric blower cannot be tension-elastically supported.

  For example, the electric blower may be housed in an electric blower case, and the electric blower case may be housed in the main body of the vacuum cleaner to prevent sound and vibration caused by the operation of the electric blower. In this case, it is difficult to sufficiently separate the electric blower case from the electric blower case while reducing the size of the electric blower case, and the coil spring is extended so that the electric blower is elastically supported by the electric blower case. I can't.

  Moreover, in order to improve the convenience of a vacuum cleaner, it is necessary to make a vacuum cleaner main body and an electric blower case lightweight. However, in an electric blower case formed thin and light using a resin such as ABS, sufficient rigidity cannot be obtained, and it is difficult to elastically support the electric blower in the electric blower case by a coil spring.

  Furthermore, when a viscoelastic body such as rubber or urethane is arranged around the electric blower to achieve vibration and sound insulation, it is optimal for the purpose of reducing the resonance peak component of the electric blower. A sufficient effect cannot be obtained in other frequency regions.

  The present invention proposes an electric vacuum cleaner that can compress and elastically support an electric blower in an electric blower case, and can prevent sound and vibration caused by operation of the electric blower.

Vacuum cleaner according to the present invention for solving the foregoing problems, and stowed electric blower case to the electric vacuum cleaner, an electric blower for sucking the air is housed in the electric blower case, the radial direction before Symbol electric blower And an anti-vibration support portion that elastically supports the electric blower on the electric blower case by a coil spring biased with a compressive force, and the electric blower case is pushed and expanded by the compressive force biased by the coil spring. The resonance frequency is changed to prevent vibration transmitted from the electric blower to the electric blower case .

  ADVANTAGE OF THE INVENTION According to this invention, an electric blower can be elastically supported in an electric blower case, and the vacuum cleaner which can sound-proof and vibration-proof the sound and vibration by the action | operation of an electric blower can be provided.

  DESCRIPTION OF EMBODIMENTS Embodiments of a suction port body and a vacuum cleaner according to the present invention will be described with reference to FIGS. 1 to 5.

  FIG. 1 is a view showing an appearance of a vacuum cleaner according to the present invention.

  As shown in FIG. 1, a vacuum cleaner 1 according to this embodiment includes a vacuum cleaner main body 2, a dust collection hose 3 having one end connected to a connecting port 2 a provided in the vacuum cleaner main body 2, and a detachable white background. The hand operation tube 4 having one end provided at the other end of the dust collecting hose 3, the extension tube 5 having one end detachably connected to the other end of the hand operation tube 4, and the other end of the extension tube 5 are detachable And a suction port body 6 connected to.

  The operation tube 4 is provided with an operation unit 4a. The operation unit 4a has a switch 4b for stopping the driving of the electric blower 10 housed in the cleaner body 2 and a strength switch 4c for setting the blowing force of the electric blower 10. Etc. are provided.

  A suction opening (not shown) for sucking dust is formed on the lower surface of the suction port body 6 and communicates with a suction chamber (not shown) formed inside the suction port body 6. This suction chamber is communicated with the inside of the cleaner body 2 from the connection port 2a through the extension pipe 5, the hand operation pipe 4, and the dust collecting hose 3.

  The vacuum cleaner body 2 is housed therein, and the electric blower 10 that applies a negative pressure to the suction port body 6 through the connection port 2a, and the dust sucked together with the air by the negative pressure generated by the electric blower 10 from the air. A detachable dust separating and collecting unit (not shown) that separates and collects dust, and air in which dust is collected in the dust separating and collecting unit is exhausted to the outside of the vacuum cleaner body 2 as exhaust air from the electric blower 10. And an exhaust port (not shown).

  FIG. 2 is a perspective view in which an electric blower case that houses an electric blower of an electric vacuum cleaner according to the present invention and an electric blower are partially cut away.

  In addition, the electric blower 10 shown by FIG. 2 has shown only the casing.

  As shown in FIG. 2, the electric blower 10 of the electric vacuum cleaner 1 is compression elastically supported by a compression elastic support body 13 in an electric blower case 12 accommodated in the cleaner main body 2.

  The electric blower case 12 is formed in a substantially cylindrical shape, and has an inlet side wall portion 12b formed with a case inlet 12a for communicating the cleaner body 2 and the inlet 10a of the electric fan 10 at one end, and the other end. The suction side case member 15 is opened at one end, and the exhaust side wall portion 12d is formed in a substantially cylindrical shape, and is formed with a case exhaust port 12c that is opened apart from the exhaust port 10b of the electric blower 10. The exhaust-side case member 16 is open at the other end. The electric blower case 12 is held and accommodated in the cleaner body 2 by a rubber-like cylindrical holding member (not shown) provided at the case suction port 12a and the case exhaust port 12c. Resin such as ABS is used for the electric blower case 12.

  The suction-side case coupling flange 18 provided at the opening end of the suction-side case member 15 and the exhaust-side case coupling flange 19 provided at one end of the opening end of the exhaust-side case member 16 Case member 15 and exhaust side case member 16 are integrally coupled.

  A cylindrical body portion of the exhaust-side case member 16 is continuous with the exhaust-side case coupling flange portion 19, and has a large-diameter cylindrical portion 21 formed to have a larger diameter than the cylindrical body portion of the suction-side case member 15. Continuing from the large-diameter cylindrical portion 21, the cylindrical portion of the suction-side case member 15 and a small-diameter cylindrical portion 22 formed to have substantially the same diameter. An annular step surface 23 is formed between the large-diameter cylindrical portion 21 and the small-diameter cylindrical portion 22 so as to face the open end of the exhaust side case member 16. The inner diameter of the exhaust side case coupling flange portion 19 is configured to be larger than the inner diameter of the suction side case coupling flange portion 18 and an inner diameter difference is generated. Due to this inner diameter difference, an annular step surface 25 is formed on the suction side case coupling flange 18 so as to face the step surface 23 of the exhaust side case member 16. The compression elastic support 13 is sandwiched between the stepped surface 23 of the exhaust side case member 16 and the stepped surface 25 of the suction side case coupling flange 18 via a cylindrical spacer 26.

  Therefore, the radial displacement of the compression elastic support 13 is constrained by the large-diameter cylindrical portion 21 of the exhaust-side case member 16, and the step surface 23 of the exhaust-side case member 16 and the step surface 25 of the suction-side case coupling flange portion 18. The axial displacement of the compression elastic support 13 is constrained.

  The compression elastic support 13 is an anti-vibration support that insulates vibrations generated by the electric blower 10, and includes an inner peripheral ring 28 provided in the electric blower case 12 and an outer periphery provided near the center of gravity of the electric blower 10. The ring 29 includes a coil spring 30 which is a spring material in which one end is fixed to the inner ring 28 and the other end is fixed to the outer ring 29 and the compression force F is urged. The axial direction and the radial direction of the electric blower 10 are elastically supported by the compression elastic support 13.

  The inner ring 28 is provided around the outer periphery of the motor unit 10 c of the electric blower 10, and a cylindrical spacer 26 is interposed between the step surface 23 of the exhaust side case member 16 and the step surface 25 of the suction side case coupling flange 18. It is pinched. On the outer surface of the inner peripheral ring 28, a convex portion 28a to which the coil spring 30 is locked projects in the radial direction.

  The outer peripheral ring 29 is provided around the inner periphery of the exhaust side case member 16. On the inner surface of the outer peripheral ring 29, a convex portion 29a to which the coil spring 30 is locked projects in the radial direction. The convex part 29a provided in the outer peripheral ring 29 and the convex part 28a provided in the inner peripheral ring 28 are opposed to each other.

  The coil springs 30 are provided between the inner ring 28 and the outer ring 29 so that a required number, for example, four are radially spaced at equal intervals. The coil spring 30 is biased by a compressive force F and is locked to a convex portion 29 a provided on the outer peripheral ring 29 and a convex portion 28 a provided on the inner peripheral ring 28. That is, the electric blower 10 is elastically supported in the electric blower case 12 via the inner ring 28 and the outer ring 29 by the coil spring 30 biased with the compressive force F in the radial direction of the electric blower 10. Instead of the coil spring 30, the compression elastic support 13 is formed by using another type of spring or elastic body such as a plate spring or a torsion bar that can bias the compression force F between the inner ring 28 and the outer ring 29. It may be configured.

  The suction port 10a of the electric blower 10 is provided with a rubber disc-shaped seal 32 in which a hole 32a communicated with the suction port 10a is formed. The suction port rib 33 projecting into the electric blower case 12 from the case suction port 12a formed in the suction port side wall portion 12b of the electric blower case 12 is brought into contact with the end portion of the seal 32.

  In the compression elastic support 13 according to the present embodiment, the compression force F is applied to the coil spring 30 to support the electric blower 10, and therefore the separation distance between the inner ring 28 and the outer ring 29 that locks the coil spring 30 is as follows: It can be configured narrower than the separation distance required when the electric blower 10 is supported by applying a tensile force to a coil spring having the same wire diameter. That is, since the distance between the electric blower 10 and the electric blower case 12 is made as narrow as possible and the outer diameter of the electric blower case 12 can be reduced, the electric blower case 12 can be reduced in size and weight.

  3 to 5 show an electric blower to which a compression force to be urged by a coil spring constituting a compression elastic support body that holds the electric blower of the electric vacuum cleaner according to the present invention and vibration generated by the operation of the electric blower are transmitted. It is the figure which showed the relationship with the vibration of a case.

The vertical axis of the diagrams shown in FIGS. 3 to 5 represents the vibration acceleration of the electric blower case 12 with 0 dB = 1.0 m / sec ² .

  FIG. 3 is a diagram showing the relationship between the vibration acceleration and the frequency of the electric fan case in which the electric fan is elastically held by using four coil springs biased with an 8N compressive force.

  FIG. 4 is a diagram showing the relationship between the vibration acceleration and the frequency of the electric fan case in which the electric fan is held using four coil springs biased with a compressive force of 20N.

  FIG. 5 is a diagram showing the relationship between vibration acceleration and frequency of an electric blower case in which the electric blower is held using eight coil springs biased with a compressive force of 20N.

The relationship between the vibration acceleration and the frequency of the electric blower case 12 shown in FIG. 3 is an observation result obtained by using the coil spring 30 having a spring constant k ₁ = 2 N / mm. The relationship between the vibration acceleration and the frequency of the electric blower case 12 shown in FIG. 6 is an observation result obtained using the coil spring 30 having a spring constant k ₂ = 5 N / mm. Moreover, the mass of the electric blower 10 is about 1 kg. When the electric blower 10 is operated, vibration having a peak at about 462 Hz is generated. Note that the rigidity of the electric blower case 12 according to the present embodiment is approximately 2 to 3 times the spring constant k ₂ of the coil spring 30.

As shown in FIG. 3, the vibration transmitted from the electric blower 10 to the electric blower case 12 through the coil spring 30 biased with the initial compression force F _0A = 8N is 1.71 dB = 1.22 m / sec at 462 Hz. The acceleration peak of ² is shown.

As shown in FIG. 4, the vibration transmitted from the electric blower 10 to the electric blower case 12 via the coil spring 30 biased with the initial compression force F _0B = 20N is −3.15 dB = 0.69 m / s at 462 Hz. The acceleration peak at sec ² is shown.

As shown in FIG. 5, the vibration transmitted from the electric blower 10 to the electric blower case 12 through the coil spring 30 biased with the initial compression force F _0B = 20N is 16.4 dB = 6.58 m / sec at 488 Hz. The acceleration peak of ² is shown.

  From FIG. 3 and FIG. 4, when the initial compression force biased by the coil spring 30 of the compression elastic support 13 is increased, vibration transmitted from the electric blower 10 to the electric blower case 12 via the compression elastic support 13 is increased. It can be seen that vibration can be further improved. The anti-vibration effect is exhibited in a wide frequency band of about 50 Hz to about 800 Hz, and the anti-vibration effect is particularly remarkable at the acceleration peak of the electric blower 10 observed at 462 Hz. 4 and 5, even if the initial compression force urged to the coil spring 30 of the compression elastic support 13 is the same, if the number of coil springs 30 used is changed, the electric force is supplied via the compression elastic support 13. It can be seen that the vibration transmitted from the blower 10 to the electric blower case 12 cannot be effectively damped.

  This observation result shows that the electric blower case 12 to which the compressive force F urged by the coil spring 30 acts is expanded outward in the radial direction and the shape is changed, and an initial stress is generated in the inside, and apparently It is considered that the main factor is that the resonance frequency of the electric blower case 12 changes, that is, the resonance frequency changes due to stress hardening. Therefore, the vibration transmitted from the electric blower 10 to the electric blower case 12 through the compression elastic support 13 is damped by changing the resonance frequency of the electric blower case 12 by the compression force F biased by the coil spring 30. can do.

  That is, if the thickness of the electric blower case 12 cannot be sufficiently secured due to the reduction in size and weight of the electric blower case 12, the compression force F urging the compression elastic support 13 holding the electric blower 10 and the electric blower case 12 The resonance frequency of the electric blower case 12 is changed by adjusting the rigidity as required and selecting the number of coil springs 30 to be used, and is transmitted from the electric blower 10 to the electric blower case 12 via the compression elastic support 13. Can effectively prevent vibration.

  In the vacuum cleaner 1 in this embodiment, it is preferable that the spring coefficient of the coil spring 30 is approximately 5 N / mm, the number of the coil springs 30 is 4, and the initial compressive force biased by the coil springs 30 is approximately 20 N.

  According to the vacuum cleaner 1 in the present embodiment, the electric blower is compression-elastically supported in the electric blower case, and sound and vibration due to the operation of the electric blower can be soundproofed and vibration-proof.

The figure which showed the external appearance of the vacuum cleaner which concerns on this invention. The perspective view which notched and showed the electric blower case which accommodates the electric blower of the vacuum cleaner which concerns on this invention partially. The figure which showed the relationship between the vibration acceleration of an electric blower case with which the electric blower was elastically held using four coil springs in which the compressive force of 8N was energized, and the frequency. The figure which showed the relationship between the vibration acceleration and frequency of an electric blower case with which the electric blower was hold | maintained using four coil springs with which the compression force of 20N was urged | biased. The figure which showed the relationship between the vibration acceleration of an electric blower case where an electric blower is hold | maintained using eight coil springs in which the compression force of 20N was urged, and an electric blower case. The fragmentary sectional view of the vacuum cleaner main body which accommodates the electric blower of the conventional vacuum cleaner. The figure which shows the characteristic of the axial direction of the electric blower of the elastic support body which elastically supports the electric blower of the conventional vacuum cleaner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric vacuum cleaner 2 Vacuum cleaner main body 2a Connection port 3 Dust collection hose 4 Hand operation pipe 4a Operation part 4b Off switch 4c Strength switch 5 Extension pipe 6 Suction port body 10 Electric blower 10a Suction port 10b Exhaust port 10c Motor part 12 Electric blower Case 12a Case suction port 12b Suction port side wall 12c Case exhaust port 12d Exhaust port side wall 13 Compression elastic support 15 Suction side case member 16 Exhaust side case member 18 Suction side case coupling flange 19 Exhaust side case coupling flange 21 Large Diameter cylinder portion 22 Small diameter cylinder portion 23 Step surface 25 Step surface 26 Cylindrical spacer 28 Inner ring 28a Protrusion portion 29 Outer ring 29a Convex portion 30 Coil spring 32 Seal 32a Hole portion 33 Suction port rib 40 Conventional electric vacuum cleaner 42 Electric blower housing Chamber 43 Tensile elastic support 45 Inner ring 46 Fan end face 47 Mounting rib 48 Outer ring 9 the coil spring 50 before the elastic member 51 before the rib 52 end rib 53 space 54 after the motor unit 55 the bearing housing portion 56 rear portion elastic member 57 ribs 58 air gap 59 cylindrical flange portion 60 seal 61 dust collecting part 62 the partition plate

Claims (1)

An electric blower case housed in the vacuum cleaner body;
An electric blower that is housed in the electric blower case and sucks air; and
Comprises a pre-Symbol the electric blower to the electric blower case a compressive force in the radial direction of the electric blower has a biased coil spring and an elastic support causes vibration isolating support portion,
A vacuum cleaner characterized in that the electric blower case is expanded by a compressive force urged by the coil spring to change its resonance frequency, thereby preventing vibration transmitted from the electric blower to the electric blower case. .

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