An improved shop vacuum with wet/dry capability uses a vacuum tube that terminates in a space between the canister and the vacuum compartment such that the fluid and content exiting the vacuum tube is not directly opposed the negative pressure source. This allows the fluid to drain into the canister in a more controlled and less volatile condition, reducing splashing and entrainment of the fluid. Moreover, a second exit for the vacuum has been added to the canister to improve the efficiency of the vacuum and the overall performance of the device.

A suction tool for a vacuum cleaner includes an outlet for connection to a vacuum cleaner; a main inlet in fluid communication with the outlet via a main suction passage; and an auxiliary inlet in fluid communication with the outlet via an auxiliary suction passage. The auxiliary suction passage includes a flow limiting device which is movable between first and second configurations, the flow limiting device obstructing air flow through the auxiliary suction passage to a greater extent when in the second configuration than when in the first configuration. The flow limiting device is configured to move to the second position in response to the pressure within the main suction passage dropping beneath a predetermined threshold.

An apparatus for a vacuum cleaner for compensating air pressure surges, where a first air flow is flowable in a first flow direction through the apparatus and a second air flow is flowable in a second flow direction through the apparatus, includes a main body having a first cross-sectional area of flow and a flow resistance element. A free end of the flow resistance element projects from the main body and produces a second cross-sectional area of flow. The first cross-sectional area of flow is larger than the second cross-sectional area of flow such that the second air flow flowable in the second flow direction is reduced.

An apparatus for a vacuum cleaner for compensating air pressure fluctuations includes a main body through which an air flow is flowable in a flow direction, where the main body contains a passage opening, and a separating element, where the passage opening is separated from ambient air by the separating element. The separating element is movable such that, as a result of a movement of the separating element in a radial direction, a reservoir which receives an air volume is produced between the main body and the separating element such that a vacuum produced in the main body by the air flow is at least partially maintained.

A dust suction device includes: a main body composed of a bottom plate and a footboard, wherein a dust suction part is formed in the bottom plate, and the footboard seals the dust suction part and has suction holes formed on the upper part thereof to allow the dust to be sucked to the dust suction part; a number of springs provided on the bottom inside the bottom plate matching the number of suction holes; balls which are provided on the upper part of the springs and which are in close contact with the suction holes of the footboard and open and close the suction holes; and a suction part which is connected to a side portion of the main body through a hose and sucks the dust through the suction holes toward the dust suction part when the suction holes are open.

A cleaner according to the present invention includes a cleaner main body, and a suction unit provided with a nozzle portion configured to suck air containing foreign substances on a floor into the cleaner main body, and a brush assembly detachably mounted on the nozzle portion, wherein the brush assembly includes a frame coupled to the nozzle portion and provided with an opening that is open toward the front and positioned adjacent to the floor, a brush rotation bar accommodated in the frame and having at least one end portion rotatably supported on the frame, and a variable shutter rotatably mounted on the frame, and configured to close a part of the opening by being rotated by pressing force upon being brought into contact with the floor, whereby air suction force can be varied to correspond to a state of the floor, thereby improving cleaning performance.

Provided is a vacuum cleaner. The switching valve apparatus of the vacuum cleaner includes an outer casing and a counterflow air passage. The outer casing is provided with a first vent opening and a second vent opening arranged side by side along the circumferential direction of the outer casing. In the case where the counterflow air passage is at the first angular position, the outer casing seals the counterflow air outlet of the counterflow air passage; in the case where the counterflow air passage is at the second angular position, the counterflow air outlet communicates with the first vent opening and is staggered with the second vent opening; and in the case where the counterflow air passage is at the third angular position, the counterflow air outlet communicates with the second vent opening and is staggered with the first vent opening.

A relief valve for portable, industrial dust collectors is provided that includes actuating means for actuating the valve between a closed position and an open position. The valve may further include retaining means for maintaining the valve in the open position. A hose device for a cleaner of a dust collector a dust collector is also provided. The hose device may be arranged such that it covers the bottom of the grid means in the cleaner when the dust collector operates and falls down when the vacuum in the dust collector is released. A cleaner, a dust collector, a grinding machine and a method for operating a dust collector are also provided. These are in conjunction with the relief valve and/or the hose device. Additionally, a dust collector with cleaner means, a relief valve, and an inlet valve and synchronization means may be arranged to govern that the actuation of the inlet valve is synchronized with actuation of the relief valve.

A cyclonic separator device for removing dust or debris from dirt-laden air, the device having a separating chamber, an inlet, an outlet, and a shroud that is connected to the separating chamber at one end, and provides a plurality of openings for the passage of air to the outlet. The device further includes a dirt collection chamber in communication with the separating chamber. The separating chamber includes an airflow directing formation which is connected to an inner surface of a generally cylindrical portion and which extends inwardly towards a central axis of the generally cylindrical portion. The airflow directing formation provides a surface which follows a substantially helical path that extends away from the inlet as it extends circumferentially around the inner surface of the generally cylindrical portion.

An improved shop vacuum with wet/dry capability uses a vacuum tube that terminates in a space between the canister and the vacuum compartment such that the fluid and content exiting the vacuum tube is not directly opposed the negative pressure source. This allows the fluid to drain into the canister in a more controlled and less volatile condition, reducing splashing and entrainment of the fluid. Moreover, a second exit for the vacuum has been added to the canister to improve the efficiency of the vacuum and the overall performance of the device.