JP2007097807A - Vacuum cleaner separating dust by physical force such as gravity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner directly separating dust from air by making a physical force such as a gravity act while the dust and air are flowing from an inlet to an outlet of a dust separation part, and exhausting only the air. <P>SOLUTION: The gravity acts despite of the flow velocity of air and becomes an effective means by elongating the acting time. The flow of a mainstream 1 is diffused by a diffuser 2 to delay the flow velocity. The air is guided by an air guide plate 3 spirally provided from the inlet 5 to the outlet 6 to be circulated horizontally. The detention time in the dust separation part is elongated to act the gravity for a long period time and improve the dust separation effect. The flow rate of the mainstream 1 is delayed to suppress the generation of peeling and reduce the inhibition force by viscosity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In a vacuum cleaner, the physical flow such as gravity while the flow of air containing dust sucked from the suction port (omitted) through the suction hose (omitted) flows from the inlet 5 to the outlet 6 of the dust separator. The present invention relates to a vacuum cleaner in which dust and air are directly separated by applying a special force so that only air is discharged from the outlet 6 of the dust separator.

  Conventionally, some vacuum cleaners use paper packs and filters. However, as dust is collected, the dust collection ability decreases due to clogging and the like, and replacement of the paper packs and cleaning of the filters are necessary.

Although there are cyclone type vacuum cleaners, the structure is complicated and it cannot be said that centrifugal force is effectively used to separate dust.
Special table 2002-532178 Introduction to Fluid Mechanics, Morikita Publishing, Ryozo Asbestos

  Without using a paper pack or filter in the vacuum cleaner, the flow of air including dust 7 sucked from the suction port (omitted) through the suction hose (omitted) is directed from the inlet 5 of the dust separator toward the outlet 6. A physical force is applied during the flow so that the dust 7 is taken out of the flow and separated, and then only air is discharged from the outlet 6 of the dust separation portion by the suction fan 9.

  In hydrodynamics, air is not an ideal fluid but a viscous Newtonian fluid, and its characteristics must be considered in vacuum cleaners. In a vacuum cleaner, the Mach number (Mach number) is not considered to be 0.3 or more, and the influence of compressibility is small, and it can be regarded as an incompressible fluid.

  In the vacuum cleaner, if the cross-sectional area of the suction hose is compared with the cross-sectional area of the dust separation part, the cross-sectional area is greatly different. In the flow of the pipeline system, the vacuum cleaner can be said to be a rapidly expanding pipe whose cross-sectional area changes greatly in steps.

In a sudden expansion tube, separation occurs immediately after expansion.
Separation refers to a state in which a streamline is separated from the wall surface and a circulation region with a backflow is formed behind it.
(Introduction to Fluid Mechanics, cited by Morikita Publishing and Ryozo Asbestos)

  If the flow of air introduced from the inlet 5 of the dust separator and flowing toward the outlet 6 of the dust separator is called the main flow 1, the sucked dust 7 is contained in the main flow 1 and carried.

  The main stream 1 has a high pressure near the inlet 5 and a low pressure near the outlet 6 sucked by the suction fan 9, and flows downstream from the inlet 5 toward the outlet 6 depending on the pressure gradient. This is a flow where the pressure drops.

In a vacuum cleaner that is a sudden expansion tube, separation occurs with the flow of the main flow 1 in the Newtonian fluid such as air depending on the viscosity, etc., but this occurs outside the flow of the main flow 1 in the Newtonian fluid. It is a secondary flow and is not directly related to dust separation.

The separation region is generated outside the main flow 1 flow and is driven by the main flow 1 flow, does not enhance the effect of dust separation, and positively separates the separation region outside the main flow 1 flow. Rotating is not taken because dust 7 trapped in the bottom of the dust container 8 is disturbed.

  Dust 7 having a large specific gravity difference from air is easily separated due to the effective physical force. However, how to separate dust 7 having a small specific gravity difference is an issue and the main focus is placed on.

Air is a viscous Newtonian fluid, and in a vacuum cleaner that is a rapidly expanding tube, an optimum physical force with little separation is selected as a physical force for dust separation.

  Dust 7 with a large specific gravity difference from large dust or air can be easily separated by effectively applying physical force, but dust 7 having a small specific gravity difference from air that is difficult to separate due to the physical force is difficult to separate. Focus on things.

  In order to use centrifugal force or inertial force as a physical force that acts on the flow of the main flow 1 for dust separation in the dust separation unit, it is necessary to rotate or rotate the main flow 1 at a high speed. It is possible to provide a curved plate that is convex with respect to the flow of the main flow 1 between them, but it is possible to rotate the flow of the main flow 1 determined by the positions of the inlet 5 and the outlet 6 one or more times due to the structure. Is difficult.

In order to use centrifugal force and inertial force as the physical force of dust separation acting on the mainstream 1 in a vacuum cleaner, which is a sudden expansion tube, a fast flow and rotation are required, but this causes separation and physical The force acts on the mass of the dust 7, while the inhibiting force due to the viscosity acts on the surface area of the dust 7, so that the physical force is difficult to act on the light dust 7 in particular, whereas the inhibiting force due to the viscosity is strong and the effect is offset. The inertial force and centrifugal force are not necessarily optimal as the physical force of dust separation, and the rotation of the main stream 1 that can be realized by the dust separation unit is only limited.

  On the other hand, gravity acts as a physical force of dust separation that acts on the dust 7 of the mainstream 1, and it works regardless of the flow velocity of the mainstream 1. If there is a means that can slow down the flow velocity and increase the residence time in the dust separation section, the gravity is applied to the dust 7 It is possible to lengthen the time for which the pressure is applied, to reduce the inhibition force due to viscosity, to suppress the generation of the separation region, and to be an effective means of dust separation.

Large dust 7 contained in the main stream 1 can be dropped into a dust container 8 disposed downward by inertia force from an inlet 5 provided downward on the side surface of the dust separation portion.

In order to use gravity for dust separation, it is necessary to slow down the flow velocity of the main flow 1 in the dust separation section to lengthen the residence time and lengthen the time for gravity to work on the dust 7, but the flow of the main flow 1 is directed downstream. Thus, the flow is a pressure drop and the cross-sectional area perpendicular to the flow does not widen.

In order to lengthen the residence time of the main flow 1 in the dust separation part, it is necessary to slow down the flow velocity of the main flow 1 by diffusing the main flow 1 and widening the cross-sectional area perpendicular to the flow.

The diffusion plate 2 having small holes provided around the introduction port 5 diffuses the flow of the main flow 1 and widens the cross-sectional area perpendicular to the flow, thereby reducing the flow velocity.

As a means for lengthening the residence time of the main flow 1 in the dust separation section and causing gravity to act on the dust 7 for a long time, the main flow 1 is swirled in a horizontal plane by a spiral air guide plate 3 from the inlet 5 to the outlet 6. It is made to flow toward the exit 6 provided in the upper surface center part from the inlet 5.

It is also possible to provide a small hole in the upper part of the spiral air guide plate 3 so as to lower the dust 7 by gravity and to guide the upper air with less dust toward the outlet 6 at the center of the upper surface.

  Although it is difficult to separate by applying physical force to extremely light dust that has a small specific gravity difference with air and floats in the air, it can be handled by opening the window after cleaning and replacing the air in the room, etc. If necessary, auxiliary means such as a filter is provided on the outlet 6 side.

Gravity that works regardless of the flow velocity of the main flow 1 is used as a physical force of the dust separation, and the main flow 1 entering from the inlet 5 of the dust separation portion is diffused by the diffusion plate 2 so that a cross-sectional area perpendicular to the flow of the main flow 1 is obtained. The flow speed is slowed by spreading, and the main flow 1 is swirled by the air guide plate 3 provided in a spiral shape, so that the residence time is lengthened and the time for the gravity to work on the dust 7 is lengthened and used for dust separation. Peeling, etc. can be suppressed, the hindrance due to viscosity can be reduced, and the structure of the vacuum cleaner can be simplified.

  In order to use inertial force or centrifugal force as the physical force of dust separation, a fast mainstream 1 flow or rotation is required, but the rotation of the mainstream 1 that can be realized in the dust separation unit is limited, causing separation and viscosity. It is not necessarily optimal because of its strong inhibitory power.

  On the other hand, gravity works regardless of the flow velocity of the main flow 1, slows the flow velocity, and lengthens the residence time in the dust separation section, so that the time that the gravity works on the dust 7 can be lengthened and becomes an effective means of dust separation, suppressing delamination. It is possible to reduce the inhibition force due to viscosity.

After dropping large dust 7 contained in the main flow 1 introduced from the inlet 5 provided downward on the side surface of the dust separator into the dust container 8 disposed below by inertia force, the surroundings of the inlet 5 A diffusion plate 2 having a small hole is provided at the center to diffuse the flow of the main flow 1 and widen the cross-sectional area perpendicular to the flow to slow down the flow velocity.

A spiral air guide plate 3 that leads from the inlet 5 to the outlet 6 is provided on the upper surface of the dust separator, and the main flow 1 is guided to the outlet 6 in the center while swirling in the horizontal plane, and the residence time in the dust separator of the main flow 1 is increased. The time for working on the gravity dust 7 is lengthened and used for dust separation, and the separated dust 7 is dropped by gravity into the dust container 8 below.

A small hole 11 may be provided in the upper part of the air guide plate 3 to lower the dust 7 so that the main flow 1 in the upper part where the dust 7 is reduced can be guided toward the outlet 6 in the central part.

  FIG. 1 is a transverse cross-sectional view of FIG. 2A-A of a dust separation unit according to a first embodiment in which the present invention is applied to a cylindrical vacuum cleaner. Air containing dust 7 is sucked from a suction port (omitted) and a suction hose (omitted) ) Through the inlet 5 provided downward on the side of the dust separator.

The large dust 7 contained in the main flow 1 introduced from the introduction port 5 is dropped from an introduction port 5 provided downward on the side surface of the dust separation portion into a dust container 8 disposed downward by inertia force.

The flow of the main flow 1 is a flow whose pressure decreases toward the downstream, and the cross-sectional area perpendicular to the flow does not widen, but the diffusion plate 2 provided with the small holes 11 diffuses the main flow 1 and has a cross-sectional area perpendicular to the flow. Spreads to slow down the mainstream 1 flow velocity.

The main flow 1 having a slow flow velocity flows toward the outlet 6 at the center of the upper surface while swirling along the air guide plate 3 spirally provided on the upper surface of the dust separation portion, so that the residence time in the dust separation portion can be increased. The dust 7 contained by applying gravity to the dust 7 for a long time is separated out of the flow of the main stream 1, and the separated dust 7 falls into the dust container 8 disposed below by gravity.

Further, a small hole 11 can be provided in the upper part of the air guide plate 3 to provide a function of guiding the main stream 1 in the upper part where the dust 7 is lowered by gravity and the dust 7 is reduced to the outlet 6 provided in the center part of the upper surface.

The outlet protection plate 4 is a plate provided with a small hole and serves to protect the outlet 6 and prevent air from concentrating on a part.

The outlet protection plate 4 can also be a filter with low ventilation resistance.

  Since the lower side of the air guide plate 3 is open, it is necessary to consider that the width of the main flow 1 does not flow from the inlet 5 to the outlet 6 directly over the lower end of the air guide plate 3.

  In order to lengthen the residence time in the dust separation section, the main flow 1 is diffused by the diffusion plate 2 to slow down the flow velocity, and the main flow 1 is swirled by the spirally provided air guide plate 3 to cause gravity to act on the dust 7 for a long time. Can improve the effect of dust separation.

Separation can be suppressed by slowing the flow velocity of the main flow 1, and the obstructive force due to the viscosity of the air can be reduced, and the structure can be simplified.

  It can be used in a dust collector that separates a viscous Newtonian fluid and solid particles.

FIG. 2A-A is a cross-sectional view of the dust separator in the first embodiment of the vacuum cleaner of the present invention. The longitudinal cross-sectional view of the dust separation part in Example 1 of this invention vacuum cleaner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main flow 2 Diffusion plate 3 Air guide plate 4 Outlet protection plate 5 Inlet 6 Outlet 7 Dust 8 Dust container 9 Suction fan 10 Motor 11 Small hole
(Suction port and suction hose are omitted from the drawing)

Claims (3)

  Considering that air is not an ideal fluid but a viscous Newtonian fluid, the vacuum cleaner is a rapidly expanding pipe in the flow of the pipeline system, and it causes peeling by the high-speed flow of the main flow 1, but the main flow 1 Gravity that works regardless of the flow velocity of the main flow is mainly used for dust separation, and the residence time is increased by slowing the flow velocity of the main flow 1 entering from the inlet 5 and swirling it horizontally in the dust separation section. Thus, the dust 7 of the mainstream 1 is devised so that the working time of gravity becomes longer, and is used for dust separation. The mainstream 1 introduced from the inlet 5 directed downward on the side surface of the dust separator is large. After the dust 7 is dropped to the dust container 8 disposed below by inertial force, the mainstream 1 is provided by the air guide plate 3 provided in a spiral shape leading from the inlet 5 to the outlet 6 on the upper surface of the central portion on the upper surface of the dust separator. Exit at the center of the top surface while the flow of water swirls in a horizontal plane The main stream 1 stays in the dust separating section so that the time of gravity is increased in the dust 7 by separating the dust 7 out of the main stream 1 and the separated dust 7. Is a vacuum cleaner in which the water is dropped into a dust container 8 disposed below by gravity. A number of small holes are provided in the upper portion of the air guide plate 3 provided in a spiral shape on the upper surface of the dust separating portion from the inlet 5 toward the outlet 6 in the center portion. The vacuum cleaner according to claim 1, further comprising an air guide plate (3) having a function of guiding the reduced main stream (1) toward the outlet (6) provided in the center. A diffusion plate 2 having a small hole is provided around the introduction port 5 directed downward in the dust separation portion to diffuse the flow of the main flow 1 and widen the cross-sectional area perpendicular to the flow, thereby reducing the flow speed and dust 7 The vacuum cleaner according to claim 1 or 2, wherein the dust separation effect is enhanced by increasing the working time of gravity.

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