Servo-valve and fluidic device

Patent metadata

Field	Value
Publication number	US-10677373-B2
Application number	US-201816229139-A
Country	US
Kind code	B2
Filing date	Dec 21, 2018
Priority date	Jun 27, 2016
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

The disclosure discloses a servo-valve that controls a fluid discharged from a discharge port of a nozzle by displacing the nozzle and drives an actuator. The servo-valve includes a receiver that includes an inflow surface provided with a first inflow port and a second inflow port into which the fluid discharged from the discharge port flows. The nozzle includes a force generation portion that includes an end surface provided with the discharge port and an outer circumferential surface formed in the periphery of the end surface. When the nozzle is displaced from a neutral position toward the first inflow port, the fluid inside the second inflow port is blown out toward the nozzle. The force generation portion collides with the fluid blown out from the second inflow port and causes an assisting force in a direction matching a nozzle displacement direction toward the first inflow port. The nozzle easily moves by the assisting force generated in the force generation portion and thus a response speed is improved.

First claim

What is claimed is:

1. A servo-valve for controlling a fluid discharged from a discharge port of a nozzle by displacing the nozzle and for driving an actuator, servo-valve comprising:
the nozzle;
a receiver that includes an inflow surface provided with a first inflow port and a second inflow port into which the fluid discharged from the discharge port flows,
a left flow path that extends from the first inflow port; and
a right flow path that extends from the second inflow port,
wherein the nozzle includes a force generation portion that includes an end surface provided with the discharge port and an outer circumferential surface formed in the periphery of the end surface,
wherein when the nozzle is displaced from a neutral position in which an extended line extended from a center of the discharge port intersects the inflow surface between the first inflow port and the second inflow port toward a position in which the extended line intersects the first inflow port, the fluid inside the second inflow port is blown out toward the nozzle,
wherein the fluid mainly flowing into the first inflow port is blown out from the second inflow port via the flow path,
wherein the left flow path and the right flow path are connected via a movable portion,
wherein the fluid mainly flowing into the first inflow port is supplied to the movable portion via the left flow path,
wherein the movable portion blows out the fluid inside the movable portion from the second inflow port by extruding the fluid to the right flow path, and
wherein the force generation portion collides with the fluid blown out from the second inflow port and causes an assisting force in a direction matching the nozzle displacement direction.

2. The servo-valve according to claim 1 ,
wherein the receiver includes a first flow path wall that forms a first flow path extended from the first inflow port and a second flow path wall that forms a second flow path extended from the second inflow port,
wherein the inflow surface divides the fluid discharged from the discharge port into a first fluid flowing into the first inflow port and a second fluid flowing into the second inflow port, and
wherein when the nozzle is displaced from the neutral position toward the first inflow port, the second fluid is reflected by the second flow path wall toward the first force generation surface.

3. The servo-valve according to claim 2 ,
wherein when the nozzle is displaced from the neutral position toward the second inflow port, the first fluid is reflected by the first flow path wall toward the second force generation surface.

4. A servo-valve that controls a fluid discharged from a discharge port of a nozzle by displacing the nozzle and drives an actuator, servo-valve comprising:
a nozzle and its discharge port;
a receiver that includes an inflow surface provided with a first inflow port and a second inflow port into which the fluid discharged from the discharge port flows,
wherein the nozzle includes a force generation portion that includes an end surface provided with the discharge port and an outer circumferential surface formed in the periphery of the end surface,
wherein when the nozzle is displaced from a neutral position in which an extended line extended from a center of the discharge port intersects the inflow surface between the first inflow port and the second inflow port toward a position in which the extended line intersects the first inflow port, the fluid inside the second inflow port is blown out toward the nozzle, and
wherein the force generation portion collides with the fluid blown out from the second inflow port and causes an assisting force in a direction matching the nozzle displacement direction;
wherein the force generation portion is a cone which protrudes toward the inflow surface and grows narrower toward the inflow surface,
wherein the outer circumferential surface includes a first force generation surface that causes an assisting force for the displacement of the nozzle toward the first inflow port and a second force generation surface that causes an assisting force for the displacement of the nozzle toward the second inflow port;
wherein the nozzle includes a facing surface that faces the inflow surface,
wherein the facing surface is formed within the first virtual plane, and
wherein the first force generation surface and the second force generation surface form a groove portion that is recessed from the first virtual plane.

5. The servo-valve according to claim 4 ,
wherein when the nozzle is displaced from the neutral position toward a position in which the extended line intersects the second inflow port, the fluid inside the first inflow port is blown out toward the nozzle, and
wherein the force generation portion collides with the fluid blown out from the first inflow port and causes an assisting force in a direction matching the nozzle displacement direction.

6. The servo-valve according to claim 5 , further comprising:
a driving unit that displaces the nozzle; and
a casing that is provided with a flow path through which the fluid flows,
wherein the casing is provided with a first outflow port connected to the first inflow port and a second outflow port connected to the second inflow port, and
wherein the driving unit displaces the nozzle between the first inflow port and the second inflow port to adjust the amount of the fluid flowing out of the first outflow port and the amount of the fluid flowing out of the second outflow port.

7. The servo-valve according to claim 6 , further comprising:
a first movable piece that moves in a reciprocating manner inside the casing by the fluid in response to the displacement of the nozzle,
wherein when the nozzle is displaced toward the first inflow port, the first movable piece is displaced by the fluid discharged to the first inflow port and extrudes the fluid from the second outflow port to blow out the fluid from the second inflow port, and
wherein when the nozzle is displaced toward the second inflow port, the first movable piece is displaced by the fluid discharged to the second inflow port and extrudes the fluid from the first outflow port to blow out the fluid from the first inflow port.

8. A fluidic device comprising:
the servo-valve according to claim 7 ; and
an actuator that includes a second movable piece operated in response to the displacement of the first movable piece.

9. A fluidic device comprising:
the servo-valve according to claim 6 ;
an actuator that includes the casing and a movable piece dividing a hollow portion formed by the casing to form the flow path,
wherein when the nozzle is displaced toward the first inflow port, the movable piece is displaced by the fluid discharged to the first inflow port and extrudes the fluid from the second outflow port to blow out the fluid from the second inflow port, and
wherein when the nozzle is displaced toward the second inflow port, the movable piece is displaced by the fluid discharged to the second inflow port and extrudes the fluid from the first outflow port to blow out the fluid from the first inflow port.

10. The servo-valve according to claim 4 ,
wherein the first force generation surface faces the second inflow port, and
wherein the second force generation surface faces the first inflow port.

11. The servo-valve according to claim 4 ,
wherein the nozzle includes a facing surface that faces the inflow surface,
wherein the facing surface is formed within the first virtual plane,
wherein the cone includes a discharge end surface that is formed within a second virtual plane defined between the first virtual plane and the inflow surface and is provided with the discha

Assignees

• Nabtesco Corp

Inventors

• Ohshio Keitaroh
• Shibata Yu
• Asada Satoshi

Classifications

• F15B13/0436 Primary

  the pilot valves being of the steerable jet type · CPC title

• F16K11/072

  with pivoted closure members · CPC title

• F16K31/423 Primary

  the actuated members consisting of multiple way valves · CPC title