JPS62194829A - Electric cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a vacuum cleaner equipped with an overage prevention device for an electric blower.

(b) Prior art As a technology prior to the present invention, for example, Japanese Patent Application Laid-Open No. 55-15
There is a 1933 publication. The first thing disclosed here is that a stopper having a hole is provided in the middle of one pipe, and one end of the pipe is placed on the intake side of an electric blower built into the vacuum cleaner body, and the other end is placed on the atmosphere side. A pressure intake port is provided on the fire communication side near the stopper, and a pressure intake port is provided between the coarse dust collection filter and the fine dust collection filter in the collection box A, and two pressure intake ports are provided before and after the stopper. A set of slidable pointers is installed together with a spring that applies a biasing force to the pointers.

With this configuration, the pointer is operated by the differential pressure between the atmosphere and the back of the coarse dust collection filter, or the pressure difference between the back of the fine dust collection filter and the two filters. This indicates that the filter is clogged and encourages you to throw away the trash or remove the filter.

However, disposing of trash and removing dust is troublesome, and vacuum cleaners that have some suction power tend to be used as is. In such a case, due to the filter being clogged, there is almost no air circulation in the electric blower, leading to abnormal overheating of the electric blower, resulting in deformation of the internal resin parts of the vacuum cleaner body, and causing ignition. There is a risk of

In order to prevent this danger, some proposals have been made to prevent overheating by providing a small hole in the vacuum cleaner body that communicates the dust collection part with the atmosphere, but this method reduces the degree of vacuum and significantly increases the ).

(/1 Problems to be Solved by the Invention The present invention has been made in view of the above-mentioned points, and is intended to prevent overheating of electric blowers caused by clogging of filters, etc., while displaying the degree of accumulation of dust. The purpose is to

B) Means for Solving the Problems The present invention provides a vacuum cleaner in which the intake side of an electric blower disposed behind a filter device and the outside air side communicate with each other via a valve body that opens and closes depending on the pressure difference. A plurality of the valve bodies are provided, and the pressure difference when each valve body is opened is set to be different.

(E) Function According to the structure of the present invention, since the plurality of valve bodies open in stages, even if the filter becomes clogged, overheating of the electric blower is prevented without causing a sudden decrease in the degree of vacuum. .

(f) Example (1) is a vacuum cleaner that has an electric blower (2) built in at the rear and a dust collection box storage chamber (4) with an opening at the top and an intake port (3) for connecting a hose at the front. A pair of rear wheels +51151 are attached to both rear sides of the main body, and a flexible front wheel (61) is attached to the bottom of the front part.

(7) is a dust collection box that is detachably installed in the dust collection box storage chamber (4), and the front wall (8) of the dust collection box has an air inlet gasket that airtightly contacts the air intake port (3). (9) Suction port α equipped with
0, a coarse dust collecting filter 07J is provided on the rear wall (111), and a fine dust collecting filter 1'3 is removably attached to the rear wall (111) through a filter gasket (141). In addition, an annular dust collection box seal packing (1
A mark is attached. .

αη is a dust collection lid that freely opens and closes the upper openings of the dust collection box storage chamber (4) and the dust collection box (7), and the lid is composed of a hollow double wall of an outer plate αl and an inner plate 09. At the same time, a handle part (2) is integrally formed at the front. (2) is an airtight shock absorber that holds the front part of the electric blower (2).

Reference symbol (2) denotes a first pressure fluctuation valve body disposed inside the dust collection lid αη, and one end of the valve body is provided at the air circulation elbow (2) and the upper opening periphery of the dust collection box (7). through hole ff14
), the other end of which communicates with the atmosphere by fitting a plug (end) with a through hole; A valve (end) that is slidably provided to open and close the through hole (5) of the plug body (1), and a valve (support) that is also provided inside the cylinder body and that always closes the valve (toward the right in the figure). It consists of a coil spring that biases the body. (2) is an air intake port provided in front of the outer plate surface of the dust collecting lid 0η.

OD is a second
One end of the pressure fluctuation valve body communicates with the intake side of the electric blower (2) via the air circulation elbow 4, and the other end communicates with the air intake side of the electric blower (2).
a pipe-shaped transparent cylindrical body (2) into which a stopper (B) having a hole (2) is fitted and communicates with the atmosphere; It is composed of a valve (to) that also serves as a dust amount display pointer, and a coil spring that is also provided inside the transparent cylinder body (to) and always biases the valve (to) in the closing direction (toward the right in the figure). ing.

(to) indicates the operation of the air intake slit provided on the top surface of the vacuum cleaner body (1), and the line indicates the operation of the second pressure fluctuation valve body C31).

In particular, there is a display window for viewing the operation of the valve (to), which also serves as a pointer, from the outside, and around the display window there is a part indicating the need for cleaning and a part indicating the need for trash disposal (see Figure t).

In the above configuration, in order to maximize the power of the vacuum cleaner, the operating timing of the pressure fluctuation valve must be set so that it is operated when the wind is below a certain level on the W (power) - Q (air volume) curve. Must be.

However, if the pressure fluctuation valve does not operate even after the peak power period has passed, the pressure in front of the electric blower will decrease due to clogging of the filter in the dust collection box, and the degree of vacuum will increase, but the air volume will decrease. . In other words, the ventilation is reduced and the temperature of the electric blower increases.

Therefore, in the present invention, in order to prevent the electric blower (2) from overheating, and to
In order to notify of clogging of z1αj, the second pressure varying valve body Gυ is also used as a dust collection amount display pointer, and when the pressure in front of the electric blower (2) becomes Pl, the valve (to) A force Fb (
= 5b(p2-pl) on.

Therefore, by appropriately setting the load fb when installing the coil spring (b), the pressure difference p becomes F1)) f1)
When 2-p occurs, the valve (to) operates, allowing fresh air to flow from the outside in front of the electric blower (2) and indicating that dirt has accumulated.

However, even if the valve (to) that also serves as the dust collection amount display indicator notifies the user of the accumulation of dust, the user may not necessarily throw away the dust immediately.

If the electric blower (2) continues to be used in this state, the air volume will further decrease and the electric blower (2) will become overheated further.

Therefore, in the present invention, a first pressure fluctuation valve body (2) is further provided, and the operation timing of this valve body is set to operate at a higher pressure P, and fresh air is further introduced to the electric blower (2). We are trying to cool down the area.

For this purpose, when installing the coil spring □□□ on the first pressure fluctuation valve body, the load ifa is set to fa)fb, and when the pressure in front of the electric blower (2) becomes P'1 (<Pt), I'm trying to get it to work. However, the area of the through hole (to) of the stopper (2) is s a = S b.

The above situation is shown in the characteristic curve of FIG.

That is, when the filter 1 (13) is clogged and the air volume is reduced to some extent, the i2 pressure fluctuation valve element 6υ opens.

In this case, although the degree of vacuum (P1) decreases to some extent, the power is still sufficient and it can be used.

When the degree of vacuum further increases to P'1 and the air volume decreases, the first pressure fluctuation valve element (2) is opened to obtain a sufficient air volume to prevent burnout of the electric blower (2).

(G1 Effects of the Invention Since the vacuum cleaner according to the present invention is constructed as described above, it is possible to display the amount of collected dust due to filter clogging.
, the electric blower can be prevented from overheating by making full use of its dust suction ability.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of the main part of the vacuum cleaner according to the present invention, FIGS. 2 and 3 are cross-sectional side views of the main part in different operating states, and FIG. 4 is a plane view of the display window in FIG. 2. 5 are characteristic curve diagrams showing the relationship between the degree of vacuum and the air volume, and between the power and the air volume in the vacuum cleaner of the present invention. (2)...Electric blower, O2...Coarse dust collection filter, αj...Fine dust collection filter, ■...First
Pressure fluctuation valve body, 6D...Second pressure fluctuation valve body.

Claims (3)

[Claims] (1) In a vacuum cleaner in which the intake side and the outside air side of an electric blower disposed behind a filter device communicate with each other via a valve body that opens and closes depending on the pressure difference, a plurality of the valve bodies are provided, and each of the valves A vacuum cleaner characterized by having different air pressure differences when the body is opened. (2) The vacuum cleaner according to claim 1, wherein one of the valve bodies also serves as a dust collection amount display. (3) The vacuum cleaner according to claim 2, wherein the valve body which also serves as a dust collection amount display is opened first.