JPH0160252B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a suction port body for a vacuum cleaner.

Technical Background and Problems First, conventional general examples are shown in FIGS. 1 to 5. Reference numeral 1 denotes a vacuum cleaner, to which a suction hose 3 and an extension pipe 4 are sequentially connected to a dust collection part 2, and a main body case 6 is provided to rotatably hold a rotary pipe 5 connected to the extension pipe 4. ing. This main case 6
The upper case 8 and the lower case 9 are assembled with the rotary tube 5 and bumper 7 sandwiched therebetween. The interior of the main body case 6 is divided into a brush chamber 1 by forming partition walls 10, 11, and 12 in the lower case 9 and the upper case 8 whose edges are connected to each other in a vertical relationship.
3, a suction air passage 14, and a transmission chamber 15. That is, the suction air passage 14 is formed into a closed space by the main body case 6 and the partition walls 10 and 11, and the rotary tube 5 is opened at one side of the suction air passage 14. Brush room 13
The bottom is open toward the floor, and there is a brush 1 inside.
A turbine 17 and a brush 16 are connected to each other by a belt 18 in the transmission chamber 15. A blowing ventilation hole 19 and a detour ventilation hole 20 are formed in the partition wall 10 to communicate the brush chamber 13 and the suction air passage 14 . One of the blowing ventilation holes 19 is for narrowing the intake airflow and blowing it against the turbine 17,
The other bypass ventilation hole 20 is for bypassing the turbine 17 and directing the intake airflow toward the rotary tube 5 without greatly restricting the intake airflow.

Next, an opening/closing plate 21 is slidably provided on the partition wall 10. The operation part 22 of this opening/closing plate 21 is connected to a guide rib 23 formed on the lower case 9.
The knob 24 of the operating section 22 protrudes from a window 25 formed in the upper case 8. A protrusion 26 is formed on the operating portion 22, and a recess 27 that elastically engages with the protrusion 26,
A plate 29 having 28 is attached to said lower case 9.

Therefore, when cleaning a carpet, the operating part 22 is pulled outward to engage the protrusion 26 in one of the recesses 27, and the opening/closing plate 21 opens the larger detour ventilation hole 20.
Close and clean. That is, the suction airflow is narrowed and sucked into the blowing ventilation hole 19, and the turbine 17 is driven by the suction airflow with a high wind speed, and the brush 16
The brush 16 also rotates, and the brush 16 releases fine dust adhering to the bristles of the carpet and promotes the dust-picking action.

Since the rotating brush 16 causes fine scratches on hard floors other than carpets, the rotation of the brush 16 is stopped. That is, the operating portion 22 is slid toward the center to engage the protrusion 26 with the recess 28 . As a result, the opening/closing plate 21 closes the blowing ventilation hole 19 and opens the large bypass ventilation hole 29. Therefore, the suction airflow is not so restricted, the wind speed is weakened, and the airflow bypasses the turbine 17, so that the turbine 17 is not driven. However, in this case, since the blowing ventilation hole 19 is closed, a space is formed that opens only on this flow path side with respect to the flow path of the suction airflow, and this space on the side where the turbine 17 is stored serves as a resonance box. This will increase the noise level. Further, a vortex is created on the turbine 17 side, which causes noise.

OBJECT OF THE INVENTION The present invention has been made in view of the above points, and provides a vacuum cleaner that can reduce noise generation when the turbine is not driven and can prevent dust from accumulating on the turbine side in the suction air path. The purpose is to obtain a suction port body.

Embodiments of the Invention The present invention will be described with reference to embodiments shown in FIGS. 6 to 9. Components that are the same as those shown based on FIGS. 1 to 5 are designated by the same reference numerals, and description thereof will be omitted. First, a turbine 17 is disposed offset to one side of the suction air passage 14, and a detour air passage 30a is formed on the other side. This detour wind path 3
A rotary tube 5 is provided on the rear side of Oa. Next, a small blowing ventilation hole 1 is provided in the partition wall 10 of the lower case 9 to restrict the intake airflow and blow it to the turbine 17.
9, and a large bypass ventilation hole 30 that bypasses the turbine 17 and flows toward the rotating tube 5 without restricting the intake airflow too much. An opening/closing plate 31 is slidably provided along the partition wall 10 to selectively restrict the entire intake airflow and adjust the wind speed and air path by opening and closing the bypass ventilation hole 30. Operation section 2 of this opening/closing plate 31
2 is slidably held by a guide rib 23 formed in the lower case 9, and the knob 24 protrudes from a window 25 formed in the upper case 8, but the amount of protrusion is determined to be within the upper surface of the upper case 8. Also, window 2
Both ends of the opening/closing plate 31 are in contact with the knob 24.
Stoppers 32 and 33 determine the stroke of the stroke.

Therefore, the opening/closing plate 31 is biased in a direction that reduces the air passage area between the brush chamber 13 and the suction air passage 14 (toward the center of the main body case 6). That is, as shown in FIG.
A tension spring 36 is tensioned between 5 and 5. Operation unit 2
The opening/closing plate 31 is resiliently engaged with a flexible locking pawl 37 integrally molded on the stopper 3 to resist the biasing force.
A locking portion 38 that is held on the second side is provided upright from the bottom of the lower case 9. The engagement force between the flexible locking pawl 37 and the locking portion 38 is set to be greater than the tension of the tension spring 36 at its maximum deflection.

In such a configuration, when cleaning a carpet, by pushing the knob 24 in the direction in which the tension of the tension spring 36 is applied, the flexible locking pawl 37 is elastically bent and released from the locking portion 38. , opening/closing plate 3
1 slides by the force of the tension spring 36 and comes to rest at the normal switching position where the knob 24 abuts against the stopper 33, and the detour ventilation hole 30 is closed as shown in FIG. In this state, the protruding height of the knob 24 is low, eliminating the risk of touching furniture, etc., and the opening/closing plate 31 is urged by the force of the tension spring 36, so that the stopper 3
3, the ventilation hole 30 is maintained in a securely closed state by being stabilized at the normal switching position in contact with the
The smaller blowing ventilation hole 19 throttles the suction airflow and increases the wind speed, thereby making it possible to drive the turbine efficiently. In addition, there is no possibility that lint or the like becomes entangled on the turbine side, and there is no risk of the turbine becoming locked.

When cleaning hard floors other than carpets, use knob 2.
4 against the force of the tension spring 36 to elastically engage the flexible locking pawl 37 with the locking portion 38. In this state, the opening/closing plate 31 is stabilized at the normal switching position where the large-diameter bypass ventilation hole 30 is fully opened, as shown in FIGS. 7 and 8. As a result, most of the suction airflow is gently sucked in through the bypass ventilation hole 30 while bypassing the turbine 17 . Some of the suction airflow blows through the ventilation hole 19
It is also sucked in from the wind, but since the wind is weak, there is no power to drive the turbine. In this case, the turbine 1
The space on the storage side 7 is not a closed space that opens only to the suction airflow side, but is a space in which the blowing ventilation hole 19 is opened, so that it no longer functions as a resonance box.
Therefore, the noise level is prevented from increasing. Further, since the suction airflow is also sucked in from the blowing ventilation hole 19, vortices are less likely to be generated in the space on the turbine 17 side. Therefore, the generation of noise caused by this eddy current is also suppressed.

Effects of the Invention Since the present invention is configured as described above, the speed of the flow of the intake air through the normally open blowing ventilation hole is controlled by opening and closing the detour ventilation hole, so that the turbine can be driven. The blowing vents are open even when the blowing vents are not installed, so the space on the turbine housing side is not a closed space that opens only to the intake airflow side, but is a space that is also open to the outside through the blowing vents. The function as a resonance box does not decrease and the noise level does not increase, and since the airflow passing through the blowing ventilation hole passes through the space on the turbine storage side, there is little chance of generating vortices in that space. This has effects such as being able to suppress the generation of noise caused by the generation of eddy currents, and also being able to prevent dust from accumulating on the turbine side in the suction air path.

[Brief explanation of drawings]

Fig. 1 is a side view showing a conventional example, with the whole reduced in size;
Figure 2 is a perspective view with a part of the main case cut away, Figure 3 is a plan view of the lower case, and Figure 4 is a section of the main case taken along line A-A in Figure 3. FIG. 5 is a perspective view with a part of the main case cut away, and FIG. 6 is a perspective view with a part of the main case cut away showing an embodiment of the present invention. Figure 7 is a partially cutaway perspective view of the main case with one of the ventilation holes open;
9 is a plan view of the lower case, and FIG. 9 is a longitudinal sectional front view showing a part of the main case in cross section taken along the line B--B in FIG. 8. 2...Dust collection section, 6...Main case, 10...Partition wall, 13...Brush room, 14...Suction air path, 1
6...Brush, 17...Turbine, 19...Blowing ventilation hole, 30...Detour ventilation hole, 30a...Detour air path, 31...Opening/closing plate.

Claims (1)

[Claims] 1. A suction air passage is formed in the main body case that runs on the floor and is partitioned by a partition wall to form a closed space, and a turbine is disposed offset to one side of this suction air passage, and A detour air path is formed on the other side, and the rear side of the detour air path is connected to a dust collection section that is in a negative pressure state, and a brush chamber with an opening on the bottom side that stores brushes connected to the turbine is connected to the partition wall. A blowing ventilation hole that is provided adjacent to the suction air passage through the partition wall and that is always open facing the turbine in the partition wall that partitions the brush chamber and the suction air passage, and a bypass ventilation hole that does not face the turbine. and an opening/closing plate that opens and closes only the detour ventilation hole is provided along the partition wall so as to reciprocate between an open position and a closed position of the detour ventilation hole. Vacuum cleaner suction body.