Machine for the preparation of beverages, in particular espresso coffee, and device for self-priming which can be used in said machine

A machine for the preparation of beverages, comprising a hydraulic circuit including:

• a brewing unit;
• a water tank;
• a pump having its inlet connected in fluid communication with the water tank and its outlet or delivery connected in fluid communication with the brewing unit;
• a heating device for heating water forced by the pump towards the brewing unit;
• a device for self-priming, which comprises a hollow housing structure, having an inlet in fluid communication with the outlet or delivery of the pump, and an outlet for spillage of water towards a collecting space;
• wherein the device for self-priming comprises a spillage member that is set between the inlet and the outlet,
• wherein the spillage member comprises a body formed with a material permeable to water and to air, said body suitable to be passed through by water and air when the pump is active,
• wherein the housing structure comprises an axially hollow tubular body, within which the body of the spillage member is housed, and at least one closing element coupled to a corresponding end of the tubular body, the at least one closing element defining one of the inlet or the outlet of the housing structure.

A machine for the preparation of beverages, comprising a hydraulic circuit including:

• a brewing unit;
• a water tank;
• a pump having its inlet connected in fluid communication with the water tank and its outlet or delivery connected in fluid communication with the brewing unit;
• a heating device for heating water forced by the pump towards the brewing unit;
• a device for self-printing, which comprises a hollow housing structure, having an inlet in fluid communication with the outlet or delivery of the pump, and an outlet for spillage of water towards a collecting space;
• wherein the device for self-printing comprises a spillage member that is set between the inlet and the outlet;
• wherein the spillage member comprises a body formed with a material permeable to water and to air, said body suitable to be passed through by water and air when the pump is active,
• wherein the housing structure has a positioning seat for the body of the spillage member;
• wherein the body of the spillage member has a cross-sectional dimension or diameter that is greater than a corresponding cross-sectional dimension or diameter of at least one from among the inlet, the outlet or the positioning seat of the housing structure.

A machine for the preparation of beverages, comprising a hydraulic circuit including:

• a brewing unit;
• a water tank;
• a pump having its inlet connected in fluid communication with the water tank and its outlet or delivery connected in fluid communication with the brewing unit;
• a heating device for heating water forced by the pump towards the brewing unit;
• a device for self-priming, which comprises a hollow housing structure, having an inlet in fluid communication with the outlet or delivery of the pump, and an outlet for spillage of water towards a collecting space;
• wherein the device for self-priming comprises a spillage member that is set between the inlet and the outlet,
• wherein the spillage member comprises a body formed with a material permeable to water and to air, said body suitable to be passed through by water and air when the pump is active,
• wherein the housing structure is configured as an insert prearranged for insertion into a tubular duct belonging to a hydraulic member of the machine.

A machine for the preparation of beverages, comprising a hydraulic circuit including:

• a brewing unit;
• a water tank;
• a pump having its inlet connected in fluid communication with the water tank and its outlet or delivery connected in fluid communication with the brewing unit;
• a heating device for heating water forced by the pump towards the brewing unit;
• a device for self-priming, which comprises a hollow housing structure, having an inlet in fluid communication with the outlet or delivery of the pump, and an outlet for spillage of water towards a collecting space;
• wherein the device for self-priming comprises a spillage member that is set between the inlet and the outlet,
• wherein the spillage member comprises a substantially porous body formed with a material permeable to water and to air, said substantially porous body being suitable to be passed through by water and air when the pump is active,
• wherein the housing structure has a positioning seat for the body of the spillage member,
• wherein the positioning seat for the body of the spillage member defines an abutment surface for at least one longitudinal end or face of the body of the spillage member.