JPS6345819B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a household vacuum cleaner that reduces noise.

Structure of a conventional vacuum cleaner and its problems FIGS. 1 and 2 show a conventional vacuum cleaner. In the figure, reference numeral 1 denotes a fan motor unit that generates suction force to suck in dust, etc., and is composed of a fan part 2 and a motor part 3 that drives the fan. 4 and exhausts air through an exhaust hole 5 provided in the motor section 3. The fan section 2 includes a casing 6, a fan 7 enclosed in the casing 6, and an air guide 8. The motor section 3 includes a frame 10 into which a stator 9 is press-fitted, and a rotor 17 supported by bearings 15 and 16 which are press-fitted into housing sections 13 and 14 of brackets 11 and 12, respectively.
It is composed of The fan 7 is a rotor 17
The casing 6 is press-fitted onto the outer periphery of the bracket 11. In order to prevent unbalanced vibrations during rotation of the fan motor unit 1, the fan motor unit 1 is supported by the vacuum cleaner main body 18 in a vibration-proof manner. That is, the fan part 2 is a substantially cylindrical anti-vibration rubber 20 fitted around the outer periphery of the casing 6, and the motor part 3 is a vibration-proof rubber 20 fitted to the outer periphery of the casing 6.
It is elastically supported by vibration isolating rubber 19 fitted to 4. The front end of the vibration isolating rubber 20 is in close contact around the ventilation hole 22 of the main body partition plate 21, and serves as a seal to prevent the exhaust gas from the fan motor unit 1 from flowing back into the intake hole 4.

23 is a filter, and a dust collection chamber 28 that collects dust
It is located between the fan motor unit 1 and the fan motor unit 1, and plays the role of separating dust. 24 is a hose connected to the dust collection chamber 28, and a floor nozzle 25 is attached to the tip. 26 is a cord reel, and 27 is a main body exhaust hole.

Next, we will discuss the effect. When the fan motor unit 1 is driven, dust and air flow into the floor nozzle 25.
The dust is sucked in and guided to the dust collection chamber 28. Then, the dust is separated by the filter 23, and this dust is stored in the dust collection chamber 28.
Only the air that accumulates in the air passes through the fan motor unit 1 and is exhausted from the main body exhaust hole 27. At this time, the space 29 in front of the intake hole 4 of the fan motor unit 1 becomes a negative pressure, a suction force acts, and the fan motor unit 1 tries to move toward the main body partition plate 21.
With respect to this movement, the vibration isolating rubber 19 fitted to the housing 14 does not act to restrict the movement of the fan motor unit 1, and only the front end of the vibration isolating rubber 20 has the above-mentioned restricting effect. by the way,
The vacuum cleaner main body 18 has a space-saving design, so the gap between the air intake hole 4 of the fan motor unit 1 and the main body partition plate 21 is only 2 to 3 mm, and the suction force reaches a maximum of 10 kg, so the air intake hole 4 In order to avoid contact with the main body partition plate 21, it is necessary to make the front end of the vibration isolating rubber 20 considerably hard. However, as shown in Fig. 3, the vibration of the fan motor unit 1 is
The axial component of the outer circumference of the casing 6 is large, and this vibration cannot be sufficiently damped at the front end of the hard anti-vibration rubber 20 and is transmitted to the cleaner body 18, which has a major disadvantage in that it generates unpleasant noise. . A possible method for softening the front end of the vibration isolating rubber 20 is to reduce the diameter of the front end and reduce the suction force by receiving it near the intake hole 4 of the casing 6. Since the casing 6 is made of a thin sheet metal, it is weak in strength and has a problem in that it is difficult to support the load generated in the axial direction.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a vacuum cleaner that improves vibration transmission and reduces noise.

Structure of the Invention The vacuum cleaner of the present invention includes a fan motor unit consisting of a fan part and a motor part, a vacuum cleaner body containing the fan motor unit, and an end of the fan motor unit on the motor part side fixed in the axial direction. A rear vibration isolator is provided on the outer periphery of the fan portion of the fan motor unit to support the fan motor unit in the radial direction. has a roughly cylindrical front anti-vibration rubber that acts as a seal for air intake and exhaust by contacting the main body partition plate, and by making the front end of this front anti-vibration rubber softer than other parts. Originally, the main axial support could be provided by the rear vibration isolating rubber attached to the motor side, which has less vibration, and the front end of the front vibration isolating rubber had to play the role of axial support. It only needs to function as a seal, and this makes it possible to have a soft structure, greatly reducing vibration transmission from this part and reducing noise.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 4 to 7. The main structure and dust collection function are the same as the conventional example, so the same parts are given the same reference numerals and a detailed explanation is omitted.The support structure and seal structure of the fan motor unit will be explained, and the vibration isolation function and The features of the effect are described below.

Near the center of the anti-fan side bracket 12 of the motor section 3 of the fan motor 1, a vibration isolating rubber 32 is fixed to the bracket 12 using screws 33 and a holding plate 34. As is clear from FIG. 6, the vibration isolating rubber 32 has a substantially cylindrical shape with an end plate 35 at one end and a flange 36 at the other end, and a motor section 2 in the center.
A cylindrical recess 3 that fits into the housing portion 14 of the
7. A ring-shaped groove 38 is formed between the end plate 35 and the flange 36, and the ribs 39 of the vacuum cleaner main body 18, which are divided into left and right parts, fit into this groove 38, and the motor part 2 is connected to the vacuum cleaner. While being elastically supported by the main body 18, the fan motor unit 1
The movement of the shaft in the axial direction is restricted. The outer periphery of the casing 6 of the fan part 2 of the fan motor unit 1 elastically supports the fan motor unit 1 in the radial direction on the cleaner main body 18, and the front end 41 of the fan motor unit 1 is connected to the main body partition plate 21 having a ventilation hole 22. A substantially cylindrical anti-vibration rubber 42 is fitted which acts as an intake/exhaust seal when in contact with the housing. Anti-vibration rubber 4
2 is made of foamed rubber, and only the front end 41 that closes the front surface of the casing 6 and the main body partition plate 21 is formed to have a higher degree of foaming than the other parts. 41 is made to be extremely soft compared to other parts. As described above, the fan motor unit 1 has vibration isolating rubber 3 in the radial direction.
2 and anti-vibration rubber 42, it is elastically supported by the cleaner main body 18, and movement in the axial direction is supported only by the anti-vibration rubber 32. This eliminates the need for the vibration isolating rubber 42 to have the function of supporting the movement of the fan motor unit 1 in the axial direction, and the front end portion 41 is made soft only for the purpose of maintaining airtightness. Third
As can be seen from the figure, in the vibration mode of the fan motor unit 1, since the casing 6 is larger than the housing part 14 of the motor part 3 and also oscillates, the axial component becomes large at the outer peripheral part of the casing 6. This occurs because the amount of unbalance of the fan 7 is larger than the amount of unbalance of the rotor 17.

When the fan motor unit 1 having the vibration mode as described above is supported by the vibration isolation structure in the embodiment of the present invention described above, there is almost no vibration transmission in the axial direction at the outer circumference of the casing 6, and the vibration isolation rubber 3
Since the vibration itself is small, there is not much transmission from the vibration isolating rubber 42, and only the transmission from the radial direction of the vibration isolating rubber 42 becomes the main vibration transmission path. However, the radial support is a part of the own weight (1 kg) of the fan motor unit 1.
(below), it is possible to design a fairly soft design, and vibration transmission from this part is also reduced, making it possible to greatly improve vibration transmission compared to the past.

Effects of the Invention The vacuum cleaner of the present invention originally supports the suction force in the axial direction with the anti-vibration rubber on the motor side, which supports the part with small vibrations. There is no need to support the load in the axial direction, and the anti-vibration rubber on the fan side can be configured to be soft, greatly improving vibration transmission and reducing noise.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view showing a conventional vacuum cleaner.
Fig. 2 is a half-sectional view showing a conventional fan motor support, Fig. 3 is an explanatory diagram showing the vibration mode of the fan motor, and Fig. 4 is a fan motor unit support of a vacuum cleaner showing an embodiment of the present invention. A half-sectional view showing,
Figure 5 is a partial cross-sectional view of the vibration isolating rubber of the same vacuum cleaner, Figure 6
The figure is an exploded perspective view showing the support structure at the rear of the fan motor unit of the same vacuum cleaner. 1...Fan motor unit, 3...Motor section, 18...Vacuum cleaner body, 32, 42...Vibration isolating rubber.

Claims (1)

[Claims] 1 A fan motor unit consisting of a fan part and a motor part, a vacuum cleaner body containing the fan motor unit, and an end of the fan motor unit on the motor part side are fixed in the axial direction, and the fan motor unit is fixed to the vacuum cleaner body. A rear anti-vibration rubber that restricts axial movement and is provided on the outer periphery of the fan part of the fan motor unit supports the fan motor unit in the radial direction, and its front end contacts the main body partition plate for air intake and exhaust. The vacuum cleaner has a substantially circular front vibration isolating rubber that serves as a seal, and the front end of the front vibration isolating rubber is softer than other parts.