JPS6041887Y2 - vacuum cleaner - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a vacuum cleaner.

Conventionally, when cleaning with a vacuum cleaner, the exhaust filter captures fine dust that could not be captured by the suction side filter and carbon abrasion dust caused by commutator wear of the electric blower. If the exhaust filter becomes clogged, exhaust air is prevented from being discharged, causing the electric blower to overheat and be damaged.

This invention was devised in view of these points, and the object is to provide a vacuum cleaner that can prevent the electric blower from overheating even if the exhaust filter becomes clogged.

This invention provides a vacuum cleaner body in which a dust collection chamber having a dust collection filter is disposed in the front stage, and an electric blower chamber in which the electric blower is housed in the rear stage and an exhaust port equipped with an exhaust filter are formed. An exhaust bypass air path is formed on the wall surface of the electric blower room to communicate the exhaust side of the electric blower room with the outside air, and the exhaust bypass air path is normally closed by a spring. A leak valve is provided to open the exhaust bypass air passage when internal pressure increases.

Therefore, even if the exhaust filter becomes clogged and the internal pressure in the electric blower room becomes high, the leak valve moves and opens the exhaust bypass air passage to allow the electric blower's exhaust air to escape, causing the vacuum cleaner to overheat. It is designed to prevent this.

A first embodiment of this invention will be explained based on FIGS. 1 to 4.

First, a dust collection case 2 is provided on the front part of the vacuum cleaner body 1, and a dust collection chamber 4 with a suction port 3 communicating therewith is formed in this dust collection case 2. A filter 5 as a filter is housed.

In addition, a main body case 6 constituting the rear part of the vacuum cleaner main body 1
is provided.

This main body case 6 is formed by combining a pair of left and right split cases, and this main body case 6 is formed with a suction bypass air passage 9 whose one end communicates with the ventilation lower and the other end communicates with the dust meter 8. An electric blower 11 housing an electric blower 10 is formed, the suction side communicating with the suction bypass air passage 9 and housing the electric blower 10 therein.

An exhaust air passage 12 communicating with the exhaust side of this electric blower 11 is formed, and at the other end of this exhaust air passage an exhaust port 14 is provided with a primary exhaust filter 13 having a rough comparative tune, which is an exhaust filter, provided on the inner surface. Further, an exhaust cover 15 covering the exhaust port 14 is detachably attached.

The exhaust port 1 has a fine secondary exhaust filter 16, which is an internal exhaust filter, attached to the exhaust cover 15 in a removable manner.
7 is formed.

Therefore, the main body case 6 has an exhaust bypass air passage 18.
is formed.

Openings 19 are formed on the outer circumferential surface of both sides of the main body case 6, which serve as one end of the exhaust bypass air passage 18.
9 is covered with a cover 21 having a through hole 20.

Further, a vent 22 communicating with the exhaust side of the electric blower chamber 11 is formed at the other end of the exhaust bypass air passage 18, and this vent 22 is biased inward of the electric blower chamber 11 by a spring 23. The leak valve 24 is slidably provided in the exhaust bypass air passage 18 and is closed.

The urging force of the spring 23 is applied to the secondary exhaust filter 1.
3. When the internal pressure of the electric blower chamber 11 rises above a predetermined level due to clogging in 16, the leak valve 24 is closed to the opening 19.
It is designed to be moved to the side.

Semicircular recesses 25 are formed on the outer peripheral surface of both sides of the main body case 6, and wheels 26 are rotatably held by bearings 27 in these recesses 25.

In such a configuration, when the electric blower 10 is driven after connecting an accessory (not shown) such as a suction hose to the suction port 3, dust accumulates in the dust collection chamber 4, and the suction purified by the filter 5 is removed. The wind flows into the electric blower chamber 11 through the suction bypass air passage 9, cools the electric blower 10, and then is exhausted.

This exhaust air passes through primary and secondary exhaust filters 13, 16, and is discharged from the exhaust port 17 to the outside of the cleaner body 1.

When dust accumulates in the dust collection chamber 4 where the filter 5 is clogged, the indicator tube 8a of the dust meter 8 moves to indicate the clogging of the dust and supplies outside air to the suction bypass air path 9.

Outside air is supplied to the electric blower room 11 from this suction bypass air passage 9, and overheating of the electric blower 10 is prevented.

Next, fine dust that could not be captured by the filter 5 and carbon abrasion dust from the commutator of the motor of the electric blower 10 are filtered through the primary exhaust filter 13 and the secondary exhaust filter 13 .
16, the primary exhaust filter 13 and the secondary exhaust filter 16 gradually become clogged, preventing exhaust air from being discharged from the electric blower 10 and increasing the internal pressure of the electric blower chamber 11. When the internal pressure reaches the internal pressure of 1 Discharge outside.

As a result, exhaust air is maintained in a state around the electric blower 10 to circulate, preventing overheating, and damage to the electric blower 10 due to this overheating is prevented.

Therefore, there is no need to pay attention to clogging of the primary exhaust filter 13, especially the secondary exhaust filter 16, and it is possible to use a very fine mesh especially for the secondary exhaust filter 16.

Next, a second embodiment of this invention will be explained based on FIG.

The same reference numerals are used for the same parts as in the previous embodiment, and the description thereof will be omitted.

This embodiment has a semicircular recess 25 on the outer peripheral surface of the main body case 6.
A shaft portion 27 for rotatably holding the wheel 26 is formed in the wheel 2 , and an opening 19 of the exhaust bypass air passage 18 is formed in the wheel 2 .
It is arranged at a position opposite to the inner surface of 6.

Therefore, the cover 21 can be omitted and the opening 19 cannot be viewed directly, thereby improving the appearance.

Since this device is configured as described above, even if the exhaust filter becomes clogged, the exhaust air from the electric blower can be discharged from the exhaust bypass air path to the vacuum cleaner body, thereby preventing the electric blower from overheating. can improve durability,
Further, a very fine exhaust filter can be used without worrying about clogging of the exhaust filter, and this has the effect of making it possible to capture fine dust and enhancing the sound deadening effect.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of the vacuum cleaner main body showing the first embodiment of this invention, Fig. 2 is a perspective view showing the state in which the wheels etc. are separated from one side of the main case, and Fig. 3. is an enlarged horizontal sectional view of the exhaust bypass air passage taken along line A-A in Fig. 2, Fig. 4 is an exploded perspective view showing the exhaust bypass air passage enlarged, and Fig. FIG. 3 is a partially exploded perspective view showing a second embodiment of the invention. 1... Vacuum cleaner body, 4... Dust collection chamber, 5
...Filter (dust collection filter), 10...
...Electric blower, 11...Electric blower room, 13
...Primary exhaust filter (exhaust filter), 14
...Exhaust port, 16...Secondary exhaust filter (exhaust filter), 17...Exhaust port, 18...Exhaust bypass air path, 23... ... Spring, 24 ... Leak valve, 26 ... Wheel.

Claims (1)

[Scope of utility model registration request] In a vacuum cleaner body in which a dust collection chamber having a dust collection filter is disposed in a front stage, and an electric blower chamber for housing an electric blower and an exhaust port provided with an exhaust filter are formed in a rear stage, a wall surface of the electric blower chamber is provided. An exhaust bypass air path is formed that communicates the exhaust side of the electric blower room with outside air, and the exhaust bypass air path is normally closed by a spring, so that the internal pressure of the electric blower room increases. A vacuum cleaner characterized in that a leak valve is provided to open the exhaust bypass air path.