JPH0126357Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a suction port body for a vacuum cleaner.

Conventionally, a main body case that is connected to the dust collection part of a vacuum cleaner and runs on the floor is formed with a partition wall separating the brush chamber that houses the rotating brushes and the suction air passage that houses the turbine that drives the rotating brushes. However, there is a device that sucks outside air through ventilation holes formed in the partition wall, drives a turbine, rotates a rotating brush, and thereby cleans carpets and the like.

However, when the main body case is removed from the floor during cleaning, the rotating brush becomes unloaded, and the opening surface of the brush chamber is opened and the amount of air sucked increases, so the rotation speed of the turbine and rotating brush increases. do.
This increases noise. For this reason, as described in Japanese Patent Publication No. 46-18675, a leak hole with a leak valve is formed in the suction air path of the main body case, and an operation panel for opening and closing the leak valve is provided. When driving, the operation plate is elastically pushed against the floor to close the leak valve, and when the main body case is removed from the floor, the return operation of the operation plate operates the leak valve in the opening direction, thus preventing leakage. Some devices also suck air through the holes to reduce the speed of the wind that drives the turbine, thereby reducing the rotational noise of the turbine and rotating brushes. However, since the leak valve and the operation plate must be connected and movable, this type of valve has a complicated structure, and can become clogged with dust, causing malfunction. Furthermore, since the operation plate must be elastically connected to the floor surface, running performance becomes poor. Furthermore, if the contact position of the main body case with respect to the floor changes, the leak valve opens and the rotational efficiency of the turbine decreases. Moreover, when the main body case is lifted up, the air flowing through the ventilation holes and the air flowing through the leak holes opening toward the floor interfere with each other at right angles, resulting in higher intake noise. It is something that exists.

This invention was made in view of the above points, and the purpose is to provide a suction port body for a vacuum cleaner that has a simplified structure and can significantly reduce noise.

When cleaning a carpet, the suction air is directed towards the turbine through the ventilation holes that communicate with the brush chamber and the suction air passage, but when the main case is removed from the floor during cleaning, the suction air is formed in the suction air passage. Air is also sucked through the leak hole, which drastically reduces the speed of wind blowing on the turbine from the ventilation hole, reducing rotational noise.The structure is simplified because the leak hole can be opened and closed simply by moving the main body case toward and away from the floor. In addition, by forming a flat part close to the tangent to the turbine on a part of the bottom of the suction air passage corresponding to the path of the suction airflow from the ventilation hole toward the turbine, the rotational efficiency of the turbine is improved. With the increased
An arcuate recess that protrudes downward from the flat part is formed in a part of the bottom of the suction air passage corresponding to the path of the suction airflow from the leak hole toward the turbine, and the air guide guides the suction airflow sucked in from the leak hole to the outside of the turbine. Because the wall is formed, the airflow from the ventilation holes does not cross at right angles and interfere with each other, which makes it possible to reduce intake noise.
By making the centers of the radii of the turbine and the arcuate recess substantially coincident, the area of the air passage under the turbine for the intake airflow from the leak hole is made uniform, and noise increase and the trapping of dust due to the generation of vortices are prevented. ,
The main body case is stabilized by making the outer surfaces of the bottoms of the arcuate recess and the brush chamber approximately coincide with each other, and the main case is configured to be able to slide lightly on the carpet surface due to the sledding action of the outer surface of the arcuate recess.

An embodiment of this invention will be explained based on the drawings.
Reference numeral 1 designates a vacuum cleaner, to which a suction hose 3 and an extension pipe 4 are sequentially connected to a dust collecting section 2, and a main body case 6 having a rotary pipe 5 connected to the extension pipe 4 is provided. This main body case 6 is constructed by assembling an upper case 8 and a lower case 9 with the rotary tube 5 and bumper 7 sandwiched therebetween. The interior of the main body case 6 is formed by forming partition walls 10, 11, 12 on the upper case 8 and the lower case 9, which are connected to each other by edges. It is partitioned into an air passage 14 and a transmission chamber 15. A rotating brush 16 installed in the brush chamber 13 and a turbine 17 located in the suction air passage 14 are connected by a belt 18 in the transmission chamber 15. A partition wall 19 is removably inserted in the center of the partition wall 10, and the partition wall 19 has a ventilation hole 20 with a large air passage area that bypasses the side of the turbine 17, and a ventilation hole 20 that faces the turbine 17. The ventilation holes 21 having a small air passage area are formed in communication with each other. Next, a wind speed adjusting plate 22 for opening and closing the ventilation hole 20 is provided so as to be slidable along the partition walls 10 and 19. This wind speed adjustment plate 22
The operating section 23 is slidably guided by a guide lip 24 formed on the main body case 6, and has a locking section 26 that engages with a protrusion 25 formed on the operating section 23.
An elastic locking plate 27 is provided on the lower case 9.

A horizontally elongated suction opening 28 and a leak hole 29 are formed in the bottom surface of the brush chamber 13. This leak hole 29 is located at a position adjacent to the ventilation hole 21 at the rear edge of the suction opening 28 . Further, the leak hole 29 is provided in the partition wall 19.
A wind guide wall 30 is formed to guide the airflow sucked in from the turbine 17 to the lower side of the turbine 17. moreover,
A flat portion 31 and an arcuate recess 32 are formed at the bottom of the suction air passage 14 . The plane portion 31 guides the suction airflow that has entered the suction through the ventilation holes 20 and 21 along a path close to a tangent to the turbine 17. The arcuate recess 32 guides the airflow sucked in from the leak hole 29 below the turbine 17 . Further, on the lower surface of the main body case 6, except for the flat surface portion 31 at the center, a sled portion 33 is formed which bulges out to the outer surface of the bottom portion by forming the arcuate recess 32. The center of the radius R of the arcuate recess 32 coincides with the center of the radius r of the turbine 17, and the radius R coincides with the outer surface of the bottom of the arcuate recess 32, that is, the sled portion 33.
is set to a size that matches the bottom outer surface of the brush chamber 13. Further, front wheels 34 are provided on both sides of the front portion of the bottom surface of the main body case 6, and rear wheels 35 are provided on both sides of the rear portion. These rear wheels 3
The axial center of the turbine 5 is located within a vertical plane passing through the axial center of the turbine 17. Further, a horizontally long brush 36 is provided on the lower surface of the main body case 6 and is located at the rear of the leak hole 29.

In such a configuration, when the ventilation passage 20 is open as shown in FIG.
0 and 21 into the suction air passage 14, and from the rotary tube 5 into the dust collecting section 2. At this time, most of the intake airflow is sucked in through the large ventilation hole 20 that bypasses the turbine 17, and the amount of wind that passes through the small ventilation hole 21 is extremely small and the wind speed is low.
is not driven by wind speed. This condition occurs when cleaning hard floors. When cleaning a carpet, the air speed adjusting plate 22 is slid toward the center of the main body case 6 to close the ventilation hole 20. That is, brush chamber 1
The air sucked in from the lower surface of the dust collector 3 flows through the ventilation hole 21 having a small air passage cross-sectional area while being increased in flow velocity, and heads toward the dust collecting part 2 while driving the turbine 17. The main body case 6 is often separated from the floor surface each time the direction is changed during cleaning, and at this time the leak hole 29 opens to reduce the suction amount and wind speed flowing through the ventilation hole 21.
Therefore, the rotating brush 16 becomes unloaded by moving away from the floor, and the number of rotations does not increase even though the opening surface of the brush chamber 13 is wide open.
Therefore, rotation noise is small.

Further, an arcuate recess 32 having a radius larger than the radius of the turbine 17 is formed in a part of the bottom of the suction air passage 14 so that the suction airflow from the leak hole 29 passes through the lower side of the turbine 17. Since the air guide wall is located at and protrudes toward the arcuate recess, the airflow from the leak hole 29 does not have any effect of rotating the turbine 17 in the reverse direction. In addition, a suction air path 14 corresponding to the suction path from the ventilation hole 21
By forming a flat part 31 close to the tangent of the turbine 17 on a part of the bottom of the carpet, the turbine 17 can be efficiently rotated by the suction airflow from the ventilation hole 21 when cleaning a carpet.

In particular, by making the centers of the radius of the turbine 17 and the arcuate recess 32 coincide, it becomes possible to make the cross-sectional area of the air passage under the turbine of the suction airflow from the leak hole 29 uniform, and to make the air passage under the turbine uniform. The cross-sectional area of the air passage is larger than that of the air passage in the process of being sucked in from the leak hole 29 with a small opening diameter and guided to the air guide wall 30. Therefore, it is possible to prevent an increase in noise due to the generation of swirling currents and to prevent dirt from getting caught. Further, since the outer bottom surface of the arcuate recess 32, that is, the sled portion 33 coincides with the outer bottom surface of the brush chamber 13, stability is good, and the sled portion 33 allows the main body case 6 to be smoothly moved with respect to the carpet surface. . As shown in FIG. 7, if the width of the sled part 33 is narrowed and a recess 37 is formed on the outside of the main case 6, the friction between the main case 6 and the carpet surface will be further reduced, and the running resistance of the main case 6 will be reduced. It gets even smaller.

Since this device is constructed as described above, when cleaning a carpet, the rotating brush is driven by blowing the suction airflow from the ventilation hole that communicates the brush chamber and the suction air path onto the turbine, but the main body case is The leak hole opens when the turbine is lifted off the floor, thereby reducing rotational noise as the turbine speed increases.Also, since there is no need for a mechanism to open and close the leak hole, it has good running performance and a simple structure. The rotational efficiency of the turbine can be improved by forming a flat part close to the turbine connection in a part of the bottom of the suction air passage corresponding to the path of the suction airflow from the ventilation hole toward the turbine. forming an arcuate recess projecting downward from the plane part in a part of the bottom of the suction air passage corresponding to the path of the suction airflow from the leak hole toward the turbine;
By making the centers of the radii of the arcuate recess and the turbine substantially coincident, it is possible to make the air passage cross-sectional area of the suction path from the leak hole uniform, thereby preventing an increase in noise and the trapping of dust due to the generation of vortices. Moreover, since the air guide wall is located above the leak hole and protrudes toward the arcuate recess, it is possible to eliminate interference between the intake airflow and the airflow from the leakage hole, reducing noise. The sled action of the outer surface of the bottom allows the main body case to slide smoothly on the carpet with a light force.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a side view with the whole scaled down showing the state of use.
The figure is a perspective view showing the inside of the main case with a part of the upper case cut away, Figure 3 is a plan view showing the inside of the main case with the upper case removed, and Figure 4 is a view of the main case from the back side. FIG. 5 is an enlarged longitudinal sectional side view taken along line A-A in FIG. 3, FIG. 6 is an enlarged longitudinal sectional side view taken along line BB in FIG. 3,
FIG. 7 shows a modification of the means for forming the sled portion, and is a perspective view of the main body case seen from the back side. 1...Vacuum cleaner, 2...Dust collecting section, 6...Main case, 13...Brush chamber, 14...Suction air path,
16...Rotating brush, 17...Turbine, 20~
21... Ventilation hole, 29... Leak hole, 30... Wind guide wall, 31... Plane portion, 32... Arc-shaped recess.

Claims (1)

[Scope of utility model registration request] A main body case that runs on the floor is connected to a dust collection part of a vacuum cleaner and has a turbine located therein, and a brush chamber with an opening at the bottom that houses a rotating brush connected to the turbine and driven. A partition is formed by a partition wall, and a ventilation hole is formed in the partition wall to communicate the suction air path and the brush chamber, and also faces the turbine, and corresponds to a path of the suction airflow from the ventilation hole toward the turbine. A flat part proximate to the connection of the rotating outer circumferential line of the turbine and an arcuate recess protruding downward from the flat part adjacent to the flat part are formed in a part of the bottom surface of the suction air passage, and the arcuate recess is The center of the radius is made to substantially coincide with the axis of the turbine, and the radius of the arcuate recess is set to a dimension such that the bottom outer surface of the arcuate recess substantially matches the bottom outer surface of the brush chamber, and the bottom of the main body case is placed on the floor surface. A leak hole is formed that is open toward the air and communicates with the bottom of the arcuate recess that is close to the ventilation hole, and an air guide wall that is located above the leak hole and projects toward the arcuate recess is provided in the partition wall. A suction port body for a vacuum cleaner characterized by: