Cleaning attachment for fluid dispenser nozzles and fluid dispensers using same

A nozzle attachment for attachment to a dispensing nozzle to deliver a discharge gas stream across a face of a discharge nozzle to remove residual material therefrom comprising:

• a retainer on the nozzle attachment for releasably attaching to a nozzle;
• an outer nozzle component in the attachment device;
• an inner nozzle component nested in the outer nozzle component and cooperating therewith to define a gas passageway therebetween and being separable in an axial direction therefrom for cleaning;
• the inner and outer nozzle components being mounted by the retainer on the nozzle and being axially separable from one another for cleaning of the inner and outer nozzle components;
• and
• inclined, spaced discharge surfaces at discharge ends of the nested inner and outer components to direct inclined inwardly and downwardly to create a discharging gas and a shearing force on the residue at the discharge end of the nozzle to remove residual material from the nozzle.

A method of providing and cleaning a nozzle attachment for removing residual material from a dispensing nozzle comprising:

• providing a nozzle attachment having an air inlet to receive pressurized air, wherein the nozzle attachment comprises nested inner and outer components which are separable in an axial direction without the use of a tool for cleaning of the components, and wherein the nested components define therebetween an internal gas passageway for gas to flow through the nozzle attachment and a discharge for discharging gas to create shear forces to remove residual material from the nozzle;
• encircling the nozzle with a clamping device on the nozzle attachment device;
• manually operating a quick connect and disconnect device to attach the nozzle attachment to the nozzle;
• dispensing material through the nozzle and flowing gas through the gas internal passageways and discharging gas to create the shear forces to remove residual material from the nozzle;
• and
• manually operating the quick connect and disconnect to detach the nozzle attachment from the nozzle for cleaning.

A fluid dispenser for use in intermittent dispensing operations, comprising:

• a dispenser body including a fluid inlet communicating with a fluid passageway;
• a discharge nozzle having a discharge end from which fluid is dispensed;
• a valve stem positioned within the fluid passageway adapted to be controllably moved vertically up and down within the fluid passageway by an actuator;
• a valve head located in the discharge end of the discharge nozzle, wherein the valve head is positionable in a sealing relationship with interior walls of the fluid passageway in the discharge end of the nozzle during non-dispensing operational times, and adapted to be moved vertically downward by the valve stem out of sealing relationship with the fluid passageway in the discharge nozzle during dispensing operational times such that fluid fed into fluid passageway can pass by the valve head and exit from the discharge end of the nozzle;
• a nozzle attachment attached to the nozzle, comprising (a) a retainer adapted to releasably attach the nozzle attachment to a dispensing nozzle, and (b) a pair of hollow-bodied nozzle attachment components that define, when nested together, an intervening space operable as a gas passageway into which pressurized gaseous fluid can be introduced and directed to a discharge opening provided at a lower axial end of the nested nozzle attachment components, wherein the gas passageway is adapted to emit gas introduced into the gas passageway as a gas stream in a direction angled inwardly and downwardly relative to a discharge end of the dispensing nozzle effective to create a shearing force at the discharge end of the nozzle that dislodges and blows off any residual material clinging to the discharge end after a prior dispensing operation or cycle.

A fluid dispenser for use in intermittent dispensing operations, comprising:

• a dispenser body including a fluid inlet communicating with a fluid passageway, and a discharge nozzle having a discharge end from which fluid is dispensed;
• a valve stem positioned within the fluid passageway adapted to be controllably moved vertically up and down within the fluid passageway by an actuator;
• a valve head located in the discharge end of the discharge nozzle, wherein the valve head has a truncated cone shape having increasing diameter axially nearer the discharge end of the nozzle and smaller diameter axially further from the discharge end of the nozzle, wherein the valve head has a first diameter adapted to seal with the passageway to stop fluid flow out of the discharge end of the nozzle when the valve stem is sufficiently vertically upraised, and a second diameter, smaller than the first diameter, in which a gap is provided between the second diameter and passageway when the valve stem is sufficiently vertically lowered to permit flow of fluid out of the discharge end of the nozzle;
• a nozzle attachment releasably attached to the nozzle, and concentrically surrounding the nozzle, wherein the nozzle attachment including an internal gas passageway for receiving pressurized gas and a discharge opening in fluid communication with the gas passageway adapted to direct the pressurized gas at an inward and downward angle relative to the discharge end of the nozzle.

A method for cleaning a discharge nozzle of a fluid dispenser, comprising:

• 1) providing a dispenser, including:
• a dispenser body having a fluid inlet communicating with a fluid passageway, and a discharge nozzle having a discharge end from which fluid is dispensed;
• a valve stem positioned within the fluid passageway adapted to be controllably moved vertically up and down within the fluid passageway by an actuator;
• a valve head located in the discharge end of the discharge nozzle, wherein the valve head has a truncated cone shape having increasing diameter axially nearer the discharge end of the nozzle and smaller diameter axially further from the discharge end of the nozzle, wherein the valve head has a first diameter adapted to seal with the passageway to stop fluid flow out of the discharge end of the nozzle when the valve stem is sufficiently vertically upraised, and a second diameter, smaller than the first diameter, in which a gap is provided between the second diameter and passageway when the valve stem is sufficiently vertically lowered to permit flow of fluid out of the discharge end of the nozzle;
• a nozzle attachment releasably attached to the nozzle, and concentrically surrounding the nozzle, wherein the nozzle attachment comprises (a) a retainer adapted to releasably attach the nozzle attachment to a dispensing nozzle, and (b) a pair of hollow-bodied nozzle attachment components that define, when nested together, an intervening space operable as a gas passageway into which pressurized gaseous fluid can be introduced and directed to a discharge opening provided at a lower axial end of the nested nozzle attachment components, wherein the gas passageway is adapted to emit gas introduced into the gas passageway as a gas stream in a direction inwardly and downwardly relative to a discharge end of the dispensing nozzle;
• 2) dispensing fluid from the dispenser via the discharge end of the nozzle;
• 3) removing residual fluid from the discharge end of the nozzle by introducing pressurized air into the gas passageway of the nozzle attachment effective to be emitted from the discharge opening of the nozzle attachment and creates a sufficient shearing force at the discharge end of the nozzle to dislodge the residual fluid from the discharge end of the nozzle.

A nozzle attachment for removing residual material from the discharge end of a nozzle and for quick attachment and detachment from the nozzle, the attachment comprising:

• an attachment assembly of components being separable for cleaning;
• an internal gas passageway in the attachment assembly between adjacent assembled components thereof and having an inlet to receive an incoming gas stream;
• a discharge end on the attachment assembly to emit a gas stream from the internal gas passageway in a direction angled inwardly and downwardly relative to the discharge end of the nozzle to remove residual material from the nozzle;
• and
• a clamping retainer for clamping onto a clamp attaching portion of the nozzle, wherein the clamping retainer is provided with substantially annular surfaces for cooperating with the annular clamp attaching portion on the dispensing nozzle, and wherein the clamping retainer being operable manually without the use of a tool to connect and disconnect the nozzle attachment from the nozzle.