Dispenser and nozzle for discharging mixture of gas and paste material and mechanical foaming device

Patent metadata

Field	Value
Publication number	US-12496599-B2
Application number	US-201917789366-A
Country	US
Kind code	B2
Filing date	Dec 27, 2019
Priority date	Dec 27, 2019
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A dispenser used for discharging a mixture of gas and a paste material includes: a nozzle part provided in a tip end part of a body and having a tip end opening through which the mixture is discharged; a flow path extending from a mixture introduction part to the tip end opening through a hollow space of the nozzle part; a needle part movable in the flow path of the nozzle part to open and close the flow path; a driving part that drives the needle part; and a stopper part that limits an operation range of the needle part. The nozzle part has a tapered section in which an inside diameter of the flow path of the nozzle part decreases toward the tip end opening. Also provided is a stopper position adjusting part that adjusts a stop position defined by the stopper part.

First claim

The invention claimed is:

1 . A dispenser used for discharging a mixture of gas and a paste material, the dispenser comprising:
a nozzle part provided in a tip end part of the dispenser and having a tip end opening through which the mixture is discharged; a flow path for the mixture extending from an introduction part for the mixture to the tip end opening through an inside of the nozzle part; a needle part movable in the flow path of the nozzle part to open and close the flow path; and a driving part that drives the needle part, wherein the nozzle part has a tapered section in which an inside diameter of the flow path of the nozzle part decreases toward the tip end opening, the inside diameter being relative to an operation range of a tip end of the needle part, as a result of the tip end of the needle part abutting against a closed position of the tapered section, the flow path for the mixture is closed, whereas as a result of the tip end of the needle part moving away from the closed position, the flow path is opened, the dispenser further comprises a stopper part that limits a moving range of the tip end of the needle part to a range from the closed position to a stop position located rearward relative to the closed position, and a stopper position adjusting part that adjusts a position of the stopper part to change the stop position, wherein the stopper position adjusting part comprises
a rod screwed into a body of the dispenser in an axial direction, a position of the rod in the axial direction being adjusted according to an amount of being screwed into the body, the needle part being stopped as a result of a tip end part of the rod abutting against a basal end part of the needle part, and
a pressure sensor that measures a pressure of the mixture in the flow path,
wherein the stopper position adjusting part further includes any one of (i) and (ii):
(i) an electric motor disposed to rotate the rod, and a controller that controls the stop position by controlling a rotation amount of the rod rotated by the electric motor, such that the pressure measured by the pressure sensor falls in a desired pressure range with respect to a discharge flow amount of the mixture;
(ii) a mechanism that makes the rod manually rotatable, and
a display unit that displays the pressure measured by the pressure sensor
wherein the operation range of the needle part is adjustable manually by adjusting a rotation amount of the rod rotated by the mechanism while looking at the pressure level detected by the pressure sensor and displayed by the display unit, and
wherein the dispenser is configured such that the pressure of the mixture dispensed from the tip end opening is controlled by adjusting the operation range of the needle part with respect to the discharge flow amount of the mixture.

2 . The dispenser according to claim 1 , wherein
a rearmost position of the stop position adjusted by the stopper position adjusting part is a position distant from the closed position by a distance equal to or longer than four times a diameter of the tip end opening.

3 . The dispenser according to claim 2 , wherein
in the position distant rearward from the closed position by a distance four times the diameter of the tip end opening, the inside diameter of the flow path is 1.1 to 3 times larger than the diameter of the tip end opening.

4 . A mechanical foaming device that discharges a mixture of gas and a paste material, the mechanical foaming device comprising:
a gas conduit used for transporting the gas; a material conduit used for transporting the paste material; a connection part to which the gas conduit and the material conduit are connected; a mixing part that mixes together the gas and the paste material coming out of the connection part; and the dispenser according to claim 1 that receives a supply of the mixture of the gas and the paste material coming out of the mixing part.

5 . The mechanical foaming device according to claim 4 , wherein
the connection part is at least one piston pump, the gas conduit and the material conduit are connected to a cylinder of the piston pump, and into a cylinder space formed by raising a piston of the piston pump, the gas transported through the gas conduit and the paste material transported through the material conduit are supplied, so that the gas and the paste material in the cylinder space are pumped forward to the mixing part as a result of lowering the piston.

6 . The mechanical foaming device according to claim 4 , wherein
the connection part is a part in which the gas conduit is connected to the material conduit via a piston pump and an opening/closing valve, and into a cylinder space formed by raising a piston of the piston pump while the opening/closing valve is closed, the gas transported through the gas conduit is supplied, so that the gas in the cylinder space is compressed as a result of lowering the piston, and so that the compressed gas is mixed into the paste material transported through the material conduit as a result of opening the opening/closing valve.

7 . The mechanical foaming device according to claim 4 , further comprising:
a constant flow amount device that supplies, to the dispenser, the mixture of the gas and the paste material mixed by the mixing part, in a constant flow amount.

Assignees

• Sunstar Engineering Inc

Inventors

• Takada Masaharu
• Yamashita Kiichi

Classifications

• B05B12/008

  integrated in or attached to a discharge apparatus, e.g. a spray gun · CPC title

• B05B7/1481

  Spray pistols or apparatus for discharging particulate material · CPC title

• B05C11/1036

  Means for supplying a selected one of a plurality of liquids or other fluent materials, or several in selected proportions, to the applying apparatus · CPC title

• B29B7/7419

  with static or injector mixer elements · CPC title

• B29B7/7409

  with supply of gas · CPC title