JPH0790004B2 - Vacuum cleaner sucker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner, and more particularly, to an improvement of an electric vacuum cleaner suction port that employs a system in which a rotating brush is driven by turbine blades.

[Conventional technology]

In an electric vacuum cleaner that employs a system in which a rotating brush is driven by turbine blades, the turbine blades rotate at a high speed, and as the number of rotations of the turbine blades increases, an unpleasant rotating sound is produced. In particular, the above-described rotation noise becomes a problem when the suction port of the vacuum cleaner is separated from the cleaning surface. The reason is as follows.

That is, when the cleaner suction port is moved away from the cleaning surface, the load of the rotating brush is reduced, the rotational torque of the turbine blade is increased, and the rotation noise of the turbine blade is emitted to the surroundings from the cleaning device suction port separated from the cleaning surface. This is because

The sound generated at the suction port of the vacuum cleaner is mainly the sound generated by the fluid, and the noise level SPL [dB (A)] is
It is said that there is a relationship of SPL∝u with the flow velocity u [m / s] (that is, the noise level is proportional to the 4 to 8th power of the flow velocity).

Conventionally, as a measure to reduce the noise as described above as much as possible, in a vacuum cleaner of a type in which a casing forming a turbine chamber is rotatably slid with respect to a suction case, a bypass hole is provided on an upper surface of the casing. By providing the vacuum cleaner, when the suction port of the cleaner is separated from the cleaning surface, the suction port case is tilted forward so that the turbine chamber communicates with the outside air to reduce the amount of air impinging on the turbine blades and reduce the turbine torque. I have to.

[Problems to be Solved by the Invention]

However, in recent years, the vacuum pressure of the turbine chamber tends to increase due to the power-up of the electric vacuum cleaner in recent years, and further, the downsizing of the vacuum cleaner suction port for the purpose of increasing the speed of the turbine blades tends to increase. , The suction case is deformed, the sliding operation between the casing forming the turbine chamber and the suction case is not performed smoothly, and when the cleaner suction port is separated from the cleaning surface, it is provided on the upper surface of the turbine chamber casing. There is a problem that the bypass hole is difficult to communicate with the outside.

In order to eliminate the above problems, the opening area of the suction port located on the lower surface of the brush chamber may be increased and the negative pressure of the turbine chamber may be suppressed to a low level.
When a vacuum cleaner is used, the flow velocity of the fluid that collides with the turbine blades becomes small, which causes a new problem that the turbine torque decreases.

In addition, the actual opening 59- entitled "brush rotary floor suction tool"
Japanese Patent No. 108549 discloses a technique relating to braking of turbine blades, but the brake mechanism disclosed in the publication is only manually operated.
As will be described later, the present invention is essentially different from the present invention that automatically attempts to reduce noise when the cleaner suction port is separated from the cleaning surface.

The object of the present invention is to solve the above problems, by reducing the flow velocity of the fluid flowing into the turbine chamber when the suction body is separated from the cleaning surface, to reduce the noise emitted from the cleaner suction port, Further, when the negative pressure becomes large by bringing the suction body into contact with the cleaning surface, the suction body of the electric vacuum cleaner capable of increasing the turbine torque by increasing the flow velocity of the fluid flowing into the turbine chamber is provided. To do.

[Means for Solving the Invention]

In order to achieve the above-mentioned object, the features of the present invention include a main body case, a brush chamber which is a front portion of the main body case, accommodates a rotary brush therein, and has a suction port on a lower surface thereof, and the main body. In a suction body of an electric vacuum cleaner, which has a turbine chamber that is a rear portion of a case and communicates with the brush chamber and that accommodates turbine blades that drive the rotating brush, and an elastic upper lid that covers an upper surface of the brush chamber. A valve element having an axis of rotation in the same axial direction as the rotating brush and provided in an opening communicating the brush chamber and the turbine chamber so as to rotate by suction air, and protruding below the upper lid. A rib body that can move in the vertical direction together with the upper lid, a rib receiving portion provided in the main body case so as to stop the downward movement of the rib body at an arbitrary position, and a rib body that moves together with the rib body. A pressure detecting portion provided on the upper lid so as to project into the opening portion and come into contact with the valve body under a constant condition, and the suction body of the electric vacuum cleaner is brought into contact with a cleaning surface to increase negative pressure. When the upper lid moves downward, the rib body and the rib receiving portion come into contact with each other, the pressure detecting portion projects into the opening portion, and the rotation of the rotating valve body is stopped to stop the opening portion. When the negative pressure is reduced by covering the upper surface of the electric vacuum cleaner with the suction body of the electric vacuum cleaner away from the cleaning surface, the upper lid moves upward and the valve body rotates to open the opening. There is something I did.

[Action]

According to the present invention, when the suction body of the vacuum cleaner is separated from the cleaning surface and the negative pressure becomes small, the valve body rotates to reduce the flow velocity of the air passing through the opening. It is possible to automatically reduce noise when the cleaner suction port is separated from the floor surface.

Further, according to the present invention, when the suction body is brought into contact with the cleaning surface and the negative pressure is increased, the flow velocity of the fluid flowing into the turbine chamber is increased, so that the turbine torque is increased. You can

〔Example〕

Hereinafter, the present invention will be described based on the embodiment of FIGS. 1 to 7 and FIG. 1 shows a state in which the valve body 30 is in an inoperative state by separating the cleaner suction port 100 from the cleaning surface. FIG. 2 is a vertical cross-sectional view of a main part taken along the line AA, and FIG. 2 is a vertical cross-sectional view of the main part corresponding to FIG. FIG. 4 is a sectional view taken along the line BB of FIG. 2, and FIG. 4 is a perspective view of the entire cleaner with the upper lid 23 removed from the mouthpiece case 1,
5 is a transverse sectional view of FIG. 4, FIG. 6 is a sectional view taken along line CC of FIG. 5, and FIG. 7 is a sectional view taken along line DD of FIG.

FIG. 4 showing the entire vacuum cleaner with the upper lid 23 removed from the mouthpiece case 1; FIG. 5 which is a transverse sectional view of FIG. 4;
In FIG. 6 which is a cross-sectional view of C, a brush chamber 2 having a rotary brush 3 inside and a suction port 4 on the lower surface is formed in the front part of the suction case 1 forming the main frame of the cleaner suction port 100. Has been done. At the center of the rear part of the mouthpiece case 1, a cylindrical pipe is formed in a substantially T shape, and a casing 6 having an opening at the front is provided with annular shafts 6a, 6a protruding on both sides thereof,
The turbine case 5 is rotatably attached to the mouthpiece case 1, and a turbine chamber 5 is formed by the casing 6. The casing 6 has turbine blades 7 that drive the rotating brush 3 built therein. At the rear end of the casing 6, a pipe-shaped inlet joint 8 which communicates with the turbine chamber 5 and is connected to an extension pipe (not shown) of the cleaner body is fitted rotatably around its axis. . Front ribs 6b and 6c located on the upper and lower surfaces of the casing 6 which are substantially arc-shaped around the annular shafts 6a and 6a
Is in contact with the inner wall of the mouthpiece case 1, which is also formed in a substantially arcuate shape, and the side ribs 6d, 6d projecting from both side ends of the casing 6 are in contact with both side walls of the mouthpiece case 1 and slide. Then
The airtightness of the turbine chamber 5 is maintained. A peripheral rib that abuts the inner wall surface of the mouthpiece case 1 on the upper wall surface of the casing 6.
A bypass hole 9 surrounded by 6e is provided, and the forward tilting of the suction case 1 with respect to the casing 6 connects the turbine chamber 5 and the outside air via the bypass hole 9. The shaft 10 of the turbine blade 7 which is unevenly distributed near the one side of the turbine chamber 5 penetrates one shaft of the annular shafts 6 a, 6 a located at the side end of the casing 6 and is fixed to the suction case 1. It is rotatably supported by an annular bearing 11. The rotation of the turbine blades 7 is transmitted to the rotating brush 3 via a belt 12 hung on one end of a shaft 10. The rotary brush 3 is rotatably supported by the suction case 1 via bearings 13, 13 supporting both ends thereof, and a brush 14 is spirally planted on the surface of the rotary brush 3. The brush chamber 2 and the turbine chamber 5 are partitioned by a partition wall 15,
The partition wall 15 is provided with a turbine vent 16 at a position facing the turbine blade 7. In addition, the partition wall 15 is located at a position apart from the turbine blades 7 and has a floor ventilation hole 17 having an opening area larger than that of the turbine ventilation hole 16.
The floor ventilation hole 17 is opened and closed by a switching lever 18 that is in close contact with the partition wall 15 and slides in the lateral direction. A front wheel 19 and a rear wheel 20 that move the entire suction port 100 in the front-back direction are attached to the suction port case 1, and the suction static pressure (negative pressure) near the suction port 4 is attached to the bottom surface of the suction port case 1. For the purpose of raising the height, a film body 21 having elasticity, which is located rearward of the suction port 7, is attached at a height so as to come into contact with the floor surface. The mouthpiece case 1 is vertically divided into two parts at a height position approximately at the center thereof, and a shock absorbing bumper 22 for hermetically holding the mating surfaces of the two divided members is sandwiched between the divided surfaces. An elastic upper lid 23 is detachably attached to the upper surface of the brush chamber 2.
L-shaped ribs 23a, which are continuously provided on the front part of the, are inserted into the fitting holes 24 provided in the front wall of the mouthpiece case 1, and the upper lid 23
In the rear part of the upper lid 23, a pair of left and right knobs 25, 25 attached to the rear side of the upper lid 23 and slidable in the front-rear direction.
But the engaging holes 26, 26 provided on both sides of the upper surface of the mouthpiece case 1
Is locked to.

As shown in FIG. 7 which is a sectional view taken along the line D-D in FIG.
When 23 is attached to the mouthpiece case 1, the peripheral edge portion 23b of the upper lid 23 abuts on the shock absorbing bumper 22, and the stop ribs 23c protruding from the rear portion of the upper lid 23 and the rib receiving portion 1a provided on the mouthpiece case 1 are provided. There is a gap δ between them.

FIG. 1 taken along the line AA in FIG. 5 in which the vacuum cleaner suction port 100 is separated from the cleaning surface and the valve body 30 is in an inoperative state, and the vacuum cleaner suction port 100 is closely attached to the cleaning surface to operate the valve body 30. And the first
In FIG. 2 corresponding to the drawing, and further in FIG. 3 which is a sectional view taken along the line BB in FIG. 2, a pressure detecting portion 23d protruding downward is formed at the center of the rear end of the upper lid 23. The pressure detecting portion 23d penetrates the guide hole 27 provided in the center of the upper surface of the suction case 1 and faces the inside of the brush chamber 2 so as to be adjacent to the turbine vent 16. On the other hand, an auxiliary opening 29 having a valve body 30 rotatably supported on the suction case 1 by pin shafts 28, 28 is provided above the turbine vent 16.

The present invention is configured as described above, and next, the operation of the above embodiment will be described.

When the vacuum cleaner suction port 100 is attached to the cleaning surface to perform floor cleaning, the switching lever 18 is slid in the direction in which the floor ventilation port 17 is opened. When the floor ventilation hole 17 is opened as described above, the dust-containing air sucked into the suction port 4 becomes
It enters the turbine chamber 5 through the floor ventilation hole 17 and the turbine ventilation hole 16, and then is guided to the cleaner body side via the suction joint 8. At this time, the turbine vent 16 is the floor vent.
Since the opening area is smaller than 17 and the above-mentioned two vent holes 16 and 17 are opened at the same time, the turbine blade 7
The turbine blade 7 does not rotate because the flow velocity of the fluid that collides with is small and the air volume is small.

On the other hand, when brushing the carpet with the rotating brush 3, the switching lever 18 is slid in the direction of closing the floor ventilation hole 17. When the floor ventilation port 17 is closed as described above, the dust-containing air sucked into the suction port 4 collides with the blade 7 through the turbine ventilation port 16 and the blade 7 rotates, The rotating brush 3 is driven.

Then, when brushing the carpet with the rotating brush 3, when the cleaner suction port 100 is brought into close contact with the cleaning surface, a negative pressure is generated in the brush chamber 2 and, as shown in FIG. 2 and FIG. Is pulled downward, and the gap indicated by reference numeral δ in FIG. 7, that is, the gap δ between the stop rib 23c projecting on the upper lid 23 and the rib receiving portion 1a provided on the mouth case 1 becomes zero, The pressure detecting portion 23d formed at the center of the rear end of the upper lid 23 projects to the front surface of the auxiliary opening 29. As described above, when the pressure detection unit 23d protrudes to the front surface of the auxiliary opening 29, the valve body 30 that has been rotating in the clockwise direction by the flow of the air passing through the turbine vent port 17 is the pressure detection unit. It abuts 23d and its rotation is stopped. At this time, the valve body 30
Is the turbine vent 17 closer to the suction port 4 than the valve body 30.
Since it receives a force in the clockwise direction by the air flowing through it, it does not rotate in the counterclockwise direction.Therefore, the auxiliary opening 29 is always closed by the valve body 30, and due to the closing of the auxiliary opening 29, The turbine torque is large, and the carpet can be brushed well, and since the vacuum cleaner suction port 100 is in close contact with the cleaning surface, the flow velocity of the fluid colliding with the turbine blades 7 is small and the air volume is also small. The rotation noise of the turbine blade 7 is low.

On the other hand, when the vacuum cleaner suction port 100 is separated from the cleaning surface, the negative pressure in the brush chamber 2 decreases, and the upper lid 23 returns to its original position due to the elastic effect of the upper lid 23 itself, and accordingly. The pressure detection unit 23d also moves upward, the valve body 30 rotates clockwise, and the auxiliary opening 29 opens. Therefore, at this time, the area of the turbine vent port 17 is
Since it will be increased by the amount equivalent to 29, the ventilation port 17
The flow velocity of the fluid passing through can be reduced, the rotation noise of the turbine blades 7 is low, and the noise emitted from the suction port 4 to the surroundings is also low.

In the above embodiment, by providing the bypass hole 9 in the upper wall surface of the casing 6 forming the turbine chamber 5, when the cleaner suction port 100 is separated from the cleaning surface, the suction case 1 tilts forward, Communicate the chamber 5 with the outside air,
The case where the present invention is applied to an electric vacuum cleaner of a type that reduces the amount of air impinging on the turbine blades 7 to reduce turbine torque and noise is illustrated. According to this, the vacuum cleaner suction port 100 is cleaned. After the surface is separated from the surface, not only until the turbine chamber 5 and the outside air communicate with each other through the bypass hole 9, but also after that, the area of the turbine vent hole 17 is equal to the area of the auxiliary opening 29. Therefore, the sliding operation between the casing 6 forming the turbine chamber 5 and the suction case 1 is always performed smoothly. Therefore, the power of this type of vacuum cleaner is increased, and the high speed of the turbine blades 7 is increased. Vacuum cleaner suction port 100
The miniaturization can be easily achieved without impairing the operability of the vacuum cleaner.

FIG. 8 shows another embodiment of the present invention, and in FIG.
1 to 7, the same reference numerals are given to the same parts, that is, 1 is a suction case that forms the main frame of the cleaner suction port 100, 2 is a brush chamber, 5 is a turbine chamber formed by a casing 6, and 6a, 6a. Is an annular shaft of the casing 6, 7 is a turbine blade, 10 is a shaft of the turbine blade 7, 15 is a partition wall for partitioning the brush chamber 2 from the turbine chamber 5, and 16 and 17 are turbines provided on the partition wall 15, respectively. A ventilation port and a floor ventilation port, and 18 denotes a switching lever for opening and closing the floor ventilation port 17.

Therefore, in the embodiment shown in FIG.
The pressure detecting unit 31 is provided in a part of the partition wall 15 in opposition to the pressure detecting unit 31, and the pressure detecting unit 31 is provided with an auxiliary opening 32. In the normal state, the auxiliary opening 32 is built in the pressure detecting unit 31. It is closed by the valve element 33 via the opened spring 34.

In the above configuration, when cleaning the floor with the vacuum cleaner suction port 100 in close contact with the cleaning surface, the switching lever 18 is slid in the direction in which the floor ventilation port 17 is opened. It is performed in the same manner as in the case of.

On the other hand, when brushing the carpet with the rotating brush 3, the switching lever 18 is slid in the direction to close the floor ventilation hole 17, as in the first embodiment.
When the vacuum cleaner suction port 100 is brought into close contact with the cleaning surface, a negative pressure is generated in the brush chamber 2, so that the auxiliary opening 32 is always closed by the valve body 33, and the auxiliary opening 32 is closed so that the first embodiment is performed. Similar to, you can brush a carpet with a large turbine torque.

On the other hand, when the vacuum cleaner suction port 100 is separated from the cleaning surface, the pressure in the turbine chamber 5 becomes lower than that in the brush chamber 2. Therefore, due to this pressure difference, the valve body 33 that has previously closed the auxiliary opening 32 is closed. Moves away from the auxiliary opening 32. Therefore,
At this time, since the area of the turbine vent 16 is increased by the amount corresponding to the auxiliary opening 32, the flow velocity of the fluid passing through the vent 16 can be reduced, and as a result, the first embodiment Similar to, the rotation noise of the turbine blades 7 is low,
The noise emitted from the suction port 4 is also small.

In addition, as shown in the illustrated embodiment, a pressure detector for detecting the pressure in the brush chamber 2 (reference numeral 23d in the first embodiment).
Further, if the reference numeral 31) in the second embodiment is operated by the differential pressure between the brush chamber 2 and the turbine chamber 5, the configuration is extremely simple, and this type of vacuum cleaner is easy to manufacture. It contributes to cost reduction.

〔The invention's effect〕

As described above, according to the present invention, when the suction body of the electric vacuum cleaner is separated from the cleaning surface and the negative pressure becomes small, the valve body rotates to reduce the flow velocity of the air passing through the opening. Therefore, noise can be automatically reduced when the vacuum cleaner suction port is separated from the floor surface.

Further, according to the present invention, when the suction body is brought into contact with the cleaning surface and the negative pressure is increased, the flow velocity of the fluid flowing into the turbine chamber is increased, so that the turbine torque is increased. You can

[Brief description of drawings]

1 to 7 show an embodiment of the electric vacuum cleaner according to the present invention, and FIG. 1 shows the valve body 3 with the vacuum cleaner suction port 100 separated from the cleaning surface.
Fig. 5 is a longitudinal sectional view of the main part taken along the line AA in Fig. 5 in which 0 is in an inoperative state, and Fig. 2 is a state in which the valve body 30 is in an operating state with the cleaner suction port 100 closely attached to the cleaning surface 5 is a vertical cross-sectional view of the main part corresponding to FIG. 3, FIG. 3 is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 4 is a perspective view of the entire cleaner with the upper lid 23 removed from the mouthpiece case 1,
FIG. 6 is a transverse sectional view of FIG. 4, FIG. 6 is a sectional view taken along line CC of FIG. 5, FIG. 7 is a sectional view taken along line DD of FIG. 5, and FIG. 8 is another embodiment of the vacuum cleaner of the present invention. It is a cross-sectional view of the main part showing an example. 1 ... Suction case, 1a ... Rib receiving part, 2 ... Brush chamber, 3 ... Rotating brush, 4 ... Suction port, 5 ... Turbine chamber, 6 ... Casing, 6a ... Annular shaft, 6b, 6c ... front rib, 6d ... side rib, 6e ... peripheral rib, 7 ... turbine blade, 8 ... suction joint, 9 ... bypass hole, 10 ... shaft, 11
…… Annular bearing, 12 …… Belt, 13 …… Bearing, 14 …… Brush, 15 …… Partition wall, 16 …… Turbine vent, 17 …… Floor vent, 18 …… Switching lever, 19 …… Front wheel, 20 …… rear wheel,
21 …… Membrane, 22 …… Shock absorbing bumper, 23 …… Top lid, 23
a …… L-shaped rib, 23b …… peripheral part, 23c …… stop rib, 23d …… pressure detection part, 24 …… fitting hole, 25 …… pick, 2
6 …… Engagement hole, 27 …… Guide hole, 28 …… Pin shaft, 29 ……
Auxiliary opening, 30 ... Valve element, 31 ... Pressure detecting part, 32 ... Auxiliary opening, 33 ... Valve element, 34 ... Spring, δ ... Gap, 100 ...
Vacuum cleaner sucker.

Claims (1)

[Claims] 1. A main body case, a brush chamber which is a front portion of the main body case and accommodates a rotating brush therein, and has a suction port on a lower surface thereof, and a rear portion of the main body case which communicates with the brush chamber. And a suction chamber of an electric vacuum cleaner having a turbine chamber for accommodating turbine blades for driving the rotating brush and an elastic upper lid covering an upper surface of the brush chamber, the rotating shaft being in the same axial direction as the rotating brush. And a valve body that is provided in an opening that communicates the brush chamber and the turbine chamber so as to rotate with suction air, and a rib body that protrudes below the upper lid and is movable in the vertical direction together with the upper lid. A rib receiving portion provided on the main body case so as to stop the downward movement of the rib body at an arbitrary position, and the rib body that moves together with the rib body and projects into the opening portion under predetermined conditions. When the negative pressure becomes large by bringing the suction body of the electric vacuum cleaner into contact with the cleaning surface, the upper lid moves downward and When the rib body and the rib receiving portion are in contact with each other, the pressure detecting portion projects into the opening portion, the rotation of the rotating valve body is stopped to cover the upper surface of the opening portion, and the suction body of the vacuum cleaner is The suction body of an electric vacuum cleaner, wherein when the negative pressure becomes small away from the cleaning surface, the upper lid moves upward and the valve body rotates to open the opening.