A wet vacuum cleaner uses a cyclone unit for separating liquid and particles from a suction flow. A main flow inlet to a cyclone chamber is spaced internally from its respective end by a separation distance. The separation distance is at least 0.1 times (effective/equivalent) diameter of the main flow inlet, which assists in preventing formation of large droplets which follows a path to a main flow outlet.

A wet vacuum cleaner uses a cyclone unit for separating liquid and particles from a suction flow. A main flow inlet to a cyclone chamber is spaced internally from its respective end by a separation distance. The separation distance is at least 0.1 times (effective/equivalent) diameter of the main flow inlet, which assists in preventing formation of large droplets which follows a path to a main flow outlet.

An upright vacuum cleaner includes a main-body part (10) having a dust-collection chamber (14) fluidly connected to a motor chamber (13) via a coupling pipe (15). A fan (13f) and a motor (13m) are housed in the motor chamber. A cleaner head (20) is pivotably and fluidly connected to the main-body part and suctions air through a suction opening (23) when a suction force is generated by the fan and the motor in the motor chamber. A straight suction passageway (24) extends through a central portion of the interior of the cleaner head in plan view. One or more batteries (50) is/are disposed within the cleaner head spaced apart (outward) from the suction passageway in the plan view.

An upright vacuum cleaner includes a main-body part (10) having a dust-collection chamber (14) fluidly connected to a motor chamber (13) via a coupling pipe (15). A fan (13f) and a motor (13m) are housed in the motor chamber. A cleaner head (20) is pivotably and fluidly connected to the main-body part and suctions air through a suction opening (23) when a suction force is generated by the fan and the motor in the motor chamber. A straight suction passageway (24) extends through a central portion of the interior of the cleaner head in plan view. One or more batteries (50) is/are disposed within the cleaner head spaced apart (outward) from the suction passageway in the plan view.

A surface cleaning apparatus comprises an air treatment chamber, a pre-motor filter and a suction motor. The suction motor and the pre-motor filter are laterally spaced from the air treatment chamber. When the surface cleaning apparatus is positioned on a horizontal surface with the upper end of the air treatment chamber above the lower end of the air treatment chamber, the pre-motor filter is positioned at a higher elevation than the suction motor.

A surface cleaning apparatus comprises an air treatment chamber, a pre-motor filter and a suction motor. The suction motor and the pre-motor filter are laterally spaced from the air treatment chamber. When the surface cleaning apparatus is positioned on a horizontal surface with the upper end of the air treatment chamber above the lower end of the air treatment chamber, the pre-motor filter is positioned at a higher elevation than the suction motor.

An upright surface cleaning apparatus comprises rear wheels that are moveable in a longitudinal direction and/or a lateral direction, which is transverse to the longitudinal direction, upon reconfiguring the upright surface cleaning apparatus between a storage position and an floor cleaning position.

A method for adjusting at least one parameter range of a device parameter of a floor treatment device for treating a surface. The parameter range is available on the floor treatment device and depends on a floor type of the surface to be treated. The parameter range comprises a defined scope of values of the device parameter selected by the user for the treatment of the surface. The user moves the floor treatment device over the surface to be treated during an adjustment process, wherein a limiting device parameter, which is dependent on the nature of the surface and upon its use for the treatment of the surface leads to a predefined fault, is automatically determined during the movement of the floor treatment device, and wherein the parameter range is automatically adjusted based on the determined limiting device parameter which defines a range end of the parameter range.

A method for adjusting at least one parameter range of a device parameter of a floor treatment device for treating a surface. The parameter range is available on the floor treatment device and depends on a floor type of the surface to be treated. The parameter range comprises a defined scope of values of the device parameter selected by the user for the treatment of the surface. The user moves the floor treatment device over the surface to be treated during an adjustment process, wherein a limiting device parameter, which is dependent on the nature of the surface and upon its use for the treatment of the surface leads to a predefined fault, is automatically determined during the movement of the floor treatment device, and wherein the parameter range is automatically adjusted based on the determined limiting device parameter which defines a range end of the parameter range.

Disclosed is a central vacuum system. The central vacuum system comprises a first vacuum device, a second vacuum device, and a hose connected between the first vacuum device and the second vacuum device; the first vacuum device and the second vacuum are controlled by a linked switch, interior of the hose remains positive or slightly negative pressure. A self-operated differential pressure regulating valve arranged at the end of the hose is capable of generating corresponding air resistance under different airflow rate so as to maintain the interior pressure of the hose at a stable slightly positive or negative pressure.