JPH07106193B2 - Vacuum cleaner dust collector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collector for an electric vacuum cleaner.

[0002]

2. Description of the Related Art Conventionally, as this kind of dust collecting meter, for example, one disclosed in Japanese Utility Model Laid-Open No. 55-88754 is known.

That is, this dust collecting meter notifies the clogging of the filter by a float operated by the atmospheric pressure and the pressure difference between the filter in the cleaner body and the front part of the fan motor, and the fan motor in the cleaner body. It also has the function of allowing cooling air to flow into the section to prevent overheating.

On the other hand, in the dust collector of the above type, since the float inside the transparent tube which is urged by the coil spring is operated by the pressure difference between the atmospheric pressure P0 and the internal pressure P1 of the cleaner body, the float rising air volume, It is important in the design to reduce the difference between the air intake volume for the floor and the air volume that the float restores when the fan motor overspeeds the float motor and the floor intake port is separated from the carpet after this. It will be a point. If this difference is large, the recovery of the float will be delayed even though there is suction force, resulting in a loss of suction force.

Particularly in an electric vacuum cleaner having a built-in powerful motor having a large suction force, it is a technical subject to reduce this difference.

Further, in Japanese Utility Model Laid-Open No. 55-153047, a transparent tube having one end communicating with the low pressure side of the cleaner body and the other end communicating with the atmosphere side is inserted into the tube body. Although there is disclosed a configuration in which a float that slides on, a coil spring that presses and urges the float toward the atmosphere side, and a lid body that is provided at the atmospheric pressure side open end of the tube body and that has an air introduction port are provided. Since there is no front pressure receiving surface that closes the air inlet of the lid, the cooling air will not flow unless the float moves to the state shown in FIG. 2, so the motor is cooled sufficiently. I don't know. Furthermore, at this point, the pressure acting on the float changes from the control pressure caused by the front and back of the float to the dynamic pressure caused by the cooling air flow hitting the float surface, so that the movement of the float rises. There is a big difference in the air volume when returning. Therefore, it is impossible to accurately display the amount of dust collected by the meter. Further, in order for the float to slide sufficiently, a clearance (gap) is required between the inner and outer walls of the transparent tube and the float, so that the filter is not clogged at all, that is, the float. Since the cooling air flows even when is not moving at all, the efficiency of the vacuum cleaner is reduced.

[0007] Furthermore, Japanese Utility Model Publication No. 38-5346 and Japanese Utility Model Publication No. 45-
27833 discloses a float that closes the air inlet, but the cooling air only flows through the gap between the inner and outer walls of the transparent tube and the float, and sufficient cooling air cannot flow in. . Also, the filter is heavily clogged,
When a large amount of cooling air is required for the motor, both prior arts use the throttle hole 14 or the vent hole 8 communicating with the low pressure side.
The float is closed, and no cooling air flows in.
For this reason, both prior arts require a separate safety valve for motor cooling.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and provides an electric vacuum cleaner in which the clogging of a filter can be easily seen, and the response is good and the cooling efficiency of a motor is improved. An object is to provide a dust collection meter.

[0009]

According to the present invention, a transparent tube having one end communicating with a low pressure side of a cleaner body and an air introducing port communicating with the atmosphere side at the other end, and inserted into the tube. A float that slides in the tubular body and a spring that urges the float toward the atmosphere side, and the float has a front pressure receiving surface that closes the air inlet and receives pressure from the inflowing air. It is formed between the cooling air inlet formed at the downstream side position of the front pressure receiving surface and the front pressure receiving surface and the inner surface of the pipe, and when the air inlet of the front pressure receiving surface is opened, the air introduction port and the cooling An air passage communicating with the air inlet and a downstream pressure receiving surface that is formed substantially parallel to the upstream pressure receiving surface are provided at the downstream opening edge of the cooling air inlet.

[0010]

[0011]

According to the present invention, since the float has the two-stage receiving surfaces of the front-stage pressure receiving surface and the rear-stage pressure receiving surface on the atmosphere side, and the cooling air inflow port is provided between both receiving surfaces, the float moves. Simultaneously with the start of the operation, the air flowing in from the air introduction port always acts on the front pressure receiving surface and the rear pressure receiving surface of the float, and a pressure proportional to the inflowing air amount always acts on both pressure receiving surfaces. Also,
After the float moves, cooling air is always introduced into the motor section to prevent the motor from overheating.

[0012]

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a cleaner body, which has a fan motor portion 3 built in via a cushioning member 2 at a rear portion thereof, and a filter 5 provided at a front portion thereof in communication with a suction port 4. A dust collecting meter 6 is provided on the upper part of the cleaner body 1 for displaying a clogging state of the filter 5 and for introducing a cooling air flow into the fan motor section 3 when the filter is clogged.

One end of the dust collecting meter 6 communicates with the low pressure space 7 between the filter 5 and the fan motor unit 3,
The transparent resin-made transparent tube body 8 having a rectangular cross-section whose other end communicates with the atmosphere side, the float 10 having a rectangular cross-section inserted into the tube body 8 and having the atmosphere-side pressure receiving surface 9, and the float 10. It is configured by a coil spring 11 that presses and biases to the atmosphere side.

Further, the structure of the dust collecting meter 6 will be described in detail with reference to FIGS. 2 to 14.

A plurality of ribs 21, 21 are formed on the inner surface of the transparent tube body 8 in the axial direction, and one of the ribs 21 corresponds to a cooling air inlet 17 of the float 10 which will be described later. It is arranged in a position. Further, the transparent tube body 8 is shown in FIG.
As is apparent from the bottom view and the right side view of FIG. 5, a reinforcing rib 13 also serving as a guide for the coil spring 11 is provided in the opening 12 at one end.
A spring receiving rib 15 of the coil spring 11 is integrally formed on the vertical wall surface 14.

The float 10 has a spring receiving portion 16 of a coil spring 11 as shown in FIGS.
At the green float part G, which is pressure biased toward the atmosphere at
10a and a red-colored float R10b fitted and connected to the float G10a.
In the float portion R10b, a front pressure receiving surface 9a as an atmosphere side pressure receiving surface 9 for closing an air introduction port 18 described later,
A two-stage receiving surface of a rear-stage pressure receiving surface 9b is formed on the downstream side of the front-stage pressure receiving surface 9a substantially parallel to the front-stage pressure receiving surface 9a. A cooling air inlet 17 is formed over the surface 9b, and when the air inlet 18 of the front pressure receiving surface 9a is opened between the front pressure receiving surface 9a and the inner surface of the transparent tube 8, the cooling air flow from the air inlet 18 is opened. An air passage for guiding air is formed at the inlet 17.

A packing (cover) 19 having an air inlet 18 is fitted into the opening of the transparent tube 8 on the atmosphere side to form a contact surface of the float R10b.

With the above construction, when the filter 5 is not clogged, the intake of cooling air is prevented as shown in FIG. 2, and when clogged, the cooling air indicated by the arrow in FIG. 3 flows in. That is, when the float 10 is actuated, the green-colored float portion G10a can be seen from the window 21 of the main body cover 20, and the red-colored float portion R10b can be seen when the filter is clogged.

Incidentally, in the above description, the rising air volume of the float 10 depends on the clogging of the filter 5 (P0
-P1) represents the suction air volume (square meters / minute) of the cleaner body 1 when the float 10 of the transparent tube 8 rises (when it starts moving) due to the differential pressure, and is transparent to the air volume when the float 10 returns. When the float 10 of the tube 8 is used with a vacuum cleaner, the floor suction port is closed with a vinyl bag or the like to activate the float 10 and become clogged, and then the vinyl bag is removed and the float 10 returns to its original state. 2 shows the suction air volume of the cleaner body 1.

In particular, when the cooling air flows into the fan motor section 3 when the filter 5 is clogged,
Due to the influence of this intake air flow, the air volume when the float 10 returns increases, but in the present invention, the float 10
The atmosphere side pressure receiving surface 9, the front pressure receiving surface 9a and the rear pressure receiving surface 9b have a two-stage structure and a cooling air inflow port 17 is provided between the both receiving surfaces 9a and 9b to prevent a rise and a return. The air volume can be made closer. Further, by forming the ribs 21 near the position corresponding to the cooling air inflow port on the inner surface of the transparent tubular body 8, the space between the float 10 and the tubular body 8 is maintained, and the air is cooled from the cooling air inflow port 17. The inclination of the float 10 due to the inflow can be prevented to improve the slidability of the float 10, and the ribs 21 can prevent the rattling of the float 10 by rectifying the cooling air. Although the ribs 21 are formed on the inner surface of the tube body 8 in the above embodiment, axial ribs may be formed on the outer peripheral surface of the float 10.

[0023]

Since the dust collector of the electric vacuum cleaner according to the present invention is constructed as described above, the float starts to move due to the clogging of the filter, and at the same time, the air flowing in from the air introduction port flows into the cooling air inflow port. Since it flows through to the motor side, overheating of the motor is prevented. Further, since the air flowing in from the air inlet always flows by hitting the front and rear pressure receiving surfaces, the float receives a pressure proportional to the amount of the inflowing air, and the float moves smoothly. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an electric vacuum cleaner showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the dust collection meter in a normal state.

FIG. 3 is a cross-sectional view of essential parts when the dust collecting meter is clogged.

FIG. 4 is a bottom view of a transparent tube body that constitutes the dust collecting meter.

FIG. 5 is a right side view of the transparent tube body.

FIG. 6 is a left side view of the float part G.

FIG. 7 is a cross-sectional view of the float part G.

FIG. 8 is a front view of the float portion G.

FIG. 9 is a right side view of the float portion G.

FIG. 10 is a bottom view of the float part G.

FIG. 11 is a cross-sectional view of the float portion R.

FIG. 12 is a front view of the float portion R.

FIG. 13 is a right side view of the float portion R.

FIG. 14 is a bottom view of the float portion R.

[Explanation of symbols]

 1 Vacuum cleaner main body 8 Transparent tube body 9 Atmospheric pressure receiving surface 9a Front pressure receiving surface 9b Rear pressure receiving surface 10 Float 10a Float part G 10b Float part 11 Coil spring (spring) 17 Cooling air inlet

Claims (2)

[Claims] 1. The one end communicates with the low pressure side of the cleaner body,
A transparent tube body having an air introduction port communicating with the atmosphere side at the other end, and a float inserted into the tube body and sliding in the tube body,
The float comprises a spring for urging the float toward the atmosphere side. The float is formed at a front pressure receiving surface that closes the air introduction port and receives pressure from the inflowing air, and at a position downstream of the front pressure receiving surface. A cooling air inlet, and an air passage formed between the front pressure receiving surface and the inner surface of the pipe, which communicates the air inlet and the cooling air inlet when the air inlet of the front pressure receiving surface is opened. A dust collecting meter for an electric vacuum cleaner, comprising: a downstream pressure receiving surface that is formed substantially parallel to the upstream pressure receiving surface at an opening edge of a downstream side of the cooling air inlet. 2. The dust collecting meter for an electric vacuum cleaner according to claim 1, wherein the float is formed by joining two members having different color tones.