Modular jetting devices
A jetting device and/or fluid module includes a nozzle with a fluid outlet, a body including a fluid chamber and a fluid inlet in fluid communication with the fluid chamber, and a valve seat disposed in the fluid chamber, where the valve seat includes an opening in fluid communication with the fluid outlet. The jetting device also includes a movable element having a top portion and a bottom portion, where the top portion is disposed external to the fluid chamber and arranged to be contacted by a reciprocating drive pin, and where the bottom portion is disposed within the fluid chamber. Finally, the jetting device also includes a sealing member contacting the movable element between the top portion and the bottom portion, where the sealing member also contacts the body, and defines a portion of a boundary of the fluid chamber to seal the fluid chamber.
1. A jetting device, comprising:
a nozzle with a fluid outlet;
a body including a fluid chamber and a fluid inlet, the fluid inlet in fluid communication with the fluid chamber;
a valve seat disposed in the fluid chamber, the valve seat including an opening in communication with the fluid outlet;
a reciprocating drive pin;
an arm mechanically coupled to the reciprocating drive pin, the arm being urged by a spring to bias the reciprocating drive pin downward;
a movable element terminating at a top portion and having a bottom portion, the top portion being disposed external to the fluid chamber and arranged to be struck by the reciprocating drive pin, the bottom portion being disposed within the fluid chamber and configured to move in a direction towards the valve seat in response to the top portion being struck by the drive pin to cause a droplet of fluid from the fluid chamber to be jetted from the fluid outlet; and
a sealing member contacting the movable element between the top portion and the bottom portion, and the sealing member defining a portion of a boundary of the fluid chamber to seal the fluid chamber.
2. The jetting device of claim 1 , wherein the bottom portion of the movable element engages the valve seat to cause the droplet of fluid from the fluid chamber to be jetted from the fluid outlet.
3. The jetting device of claim 1 , wherein a diameter of the opening of the valve seat is greater than a diameter of the fluid outlet of the nozzle.
4. The jetting device of claim 1 , wherein the bottom portion of the movable element tapers to a flat surface, the flat surface engaging with the valve seat.
5. The jetting device of claim 1 , wherein the fluid inlet comprises a fluid passageway having at least a portion that runs in a direction substantially perpendicular to a direction of movement of the bottom portion of the movable element toward the valve seat.
6. The jetting device of claim 1 , wherein the fluid inlet connects with the fluid chamber at a direction substantially perpendicular to a direction of movement of the bottom portion of the movable element toward the valve seat.
7. The jetting device of claim 1 , wherein the fluid comprises at least one of: solder flux, solder paste, adhesive, solder mask, thermal compound, oil, encapsulant, potting compound, ink, or silicone.
8. The jetting device of claim 1 , wherein the sealing member comprises a sealing ring.
9. The jetting device of claim 1 , wherein a longitudinal axis of the drive pin is the same as a longitudinal axis of the movable element.
10. The jetting device of claim 1 , wherein the movable element is configured to move away from the valve seat after the drive pin is reciprocated out of contact with the top portion of the movable element.
11. The jetting device of claim 1 , wherein the sealing member contacts a periphery of the movable element between the top portion and the bottom portion of the movable element.
12. The jetting device of claim 1 , wherein an area of contact between the top portion of the movable element and the drive pin is a contiguous flat surface which overlaps with a central longitudinal axis of the movable element.
13. The jetting device of claim 2 , wherein the bottom portion of the movable element strikes the valve seat in response to the top portion being struck by the drive pin to cause the droplet of fluid from the fluid chamber to be jetted from the fluid outlet.
14. The jetting device of claim 1 , further comprising an actuator mechanically coupled to the drive pin, the actuator being configured to cause downward reciprocation of the drive pin.
15. The jetting device of claim 14 , wherein the actuator is a piezoelectric actuator.
16. The jetting device of claim 1 , wherein the bottom portion of the movable element engages the valve seat at an inner perimeter of the valve seat.
17. The jetting device of claim 1 , wherein the fluid chamber is interposed between the movable element and the valve seat.
18. The jetting device of claim 1 , wherein a surface of the fluid chamber defining the valve seat is perpendicular to the movement direction of the movable element towards the valve seat.