Water purification device

A portable device (1) for water purification, the device (1) comprising a dirt water container (2) for accumulating dirt water and a purification unit (5) for purifying the dirt water, wherein the dirt water container (2) is arranged above the purification unit (5) for driving water through the purification unit (5) by gravity;

• wherein the purification unit (5) comprises a filter housing (5′) enclosing a purification medium that is separating an upstream side (52) of the purification unit (5) from a downstream side (53) of the purification unit (5) such that water in the purification unit (5) can flow from the upstream side (52) to the downstream side (53) only through the purification medium;
• the filter housing (5′) having a downstream outlet (29A) from the downstream side (53);
• wherein the purification unit (5) is a filtration unit (5) and the purification medium is a microporous filtration membrane;
• wherein the dirt water container (2) has a container outlet (10), and the filter housing (5′) has an upstream inlet (19) to the upstream side, wherein the container outlet (10) and the upstream inlet (19) are fluid-flow-connected by a first flow connector (9) for receiving dirt water from the dirt water container (2) into the upstream side of the purification unit (5);
• wherein the device comprises a clean water tank (3) fluid-flow connected to the downstream side (53) through the downstream outlet (29A) for receiving purified water from the downstream side (53), wherein the filtration unit (5) has an upstream outlet (23) in the filter housing (5′) for outlet of fluid from the upstream side, wherein a vent tube (12) is connected to the upstream outlet (23) for venting of air from the filter housing (5′) through the upstream outlet (23) and into the vent tube (12) when dirt water enters the filter housing (5′) through the upstream inlet (19), the vent tube (12) extending upwards and having a vent opening (22) into atmosphere for venting of air from the upstream side and the vent tube, and wherein the vent opening (22) is provided at a level closer to a top than to a bottom (16) of the dirt water container (2) for preventing dirt water to flow from the filter housing (5′) through the upstream outlet (23) through the vent tube (12) and out of the vent opening (2), wherein a one way check valve (54) is provided between the dirt water container (2) and the upstream side (52) of the filtration unit (5) for preventing backwash water from being pressed into the dirt water container (2) when backwash water is pressed through the filter and through the upwardly extending vent tube and into the backwash receptacle.

A portable device (1) for water purification, the device (1) comprising a dirt water container (2) for accumulating dirt water and a purification unit (5) for purifying the dirt water, wherein the dirt water container (2) is arranged above the purification unit (5) for driving water through the purification unit (5) by gravity;

• wherein the purification unit (5) comprises a filter housing (5′) enclosing a purification medium that is separating an upstream side (52) of the purification unit (5) from a downstream side (53) of the purification unit (5) such that water in the purification unit (5) can flow from the upstream side (52) to the downstream side (53) only through the purification medium;
• the filter housing (5′) having a downstream outlet (29A) from the downstream side (53);
• wherein the purification unit (5) is a filtration unit (5) and the purification medium is a microporous filtration membrane;
• wherein the dirt water container (2) has a container outlet (10), and the filter housing (5′) has an upstream inlet (19) to the upstream side, wherein the container outlet (10) and the upstream inlet (19) are fluid-flow-connected by a first flow connector (9) for receiving dirt water from the dirt water container (2) into the upstream side of the purification unit (5);
• wherein the device comprises a clean water tank (3) fluid-flow connected to the downstream side (53) through the downstream outlet (29A) for receiving purified water from the downstream side (53), and wherein the dirt water container (2) is rigid, wherein the clean water tank (3) is rigid, wherein the device (1) has a modular build-up with mutually stackable dirt water container (2), intermediate module (4), and clean water tank (3), wherein the intermediate module (4) is supported by the clean water tank (3) and, in turn, supports the dirt water container (2) when in stacked condition to form an integrated three-module system, wherein the dirt water container (2) is arranged above the clean water tank (2) and with a clearance of at least 5 cm between the clean water tank (3) and the dirt water container (2), wherein the filtration unit (5) has an upstream outlet (23) in the filter housing (5′) for outlet of fluid from the upstream side (52), wherein a vent tube (12) is connected to the upstream outlet (23) for venting of air from the filter housing (5′) through the upstream outlet (23) and into the vent tube (12) when dirt water enters the filter housing (5′) through the upstream inlet (19), the vent tube (12) extending upwards and having a vent opening (22) into atmosphere for venting of air from the upstream side and the vent tube, and wherein the vent opening (22) is provided at a level closer to a top than to a bottom (16) of the dirt water container (2) for preventing dirt water to flow from the filter housing (5′) through the upstream outlet (23) through the vent tube (12) and out of the vent opening (22).