Fluid injection device and fluid injection system

Patent metadata

Field	Value
Publication number	US-11098626-B2
Application number	US-202016843190-A
Country	US
Kind code	B2
Filing date	Apr 8, 2020
Priority date	Apr 22, 2019
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A fluid injection device includes a valve body of a cylindrical shape and a valve member, which is movably accommodated in the valve body and which has a valve surface portion to be seated on or separated from a valve seat portion formed in an inside of the valve body. The valve member has an inside passage through which urea aqueous solution flows and a communication port, which is opened at an outer peripheral surface of the valve member and at a position of an upstream side of the valve surface portion in a flow direction of air. An annular fluid passage, through which the air flows, is formed between an inner peripheral surface of the valve body and the outer peripheral surface of the valve member. The communication port is connected to the annular fluid passage at a connecting passage portion. A cross-sectional passage area of the annular fluid passage at the connecting passage portion is smaller than a cross-sectional passage area of the annular fluid passage at an upstream-side passage portion thereof.

First claim

What is claimed is:

1. A fluid injection device comprising:
a valve body of a cylindrical shape;
a valve member movably accommodated in the valve body and having a valve surface portion, which is operatively seated on or separated from a valve seat portion formed in an inside of the valve body; and
an annular fluid passage formed between an inner peripheral surface of the valve body and an outer peripheral surface of the valve member, through which gas flows,
wherein the valve member includes;
an inside passage formed in an inside of the valve member and extending in an axial direction of the valve member, through which liquid flows; and
a communication port for communicating the inside passage to the annular fluid passage, the communication port being opened at the outer peripheral surface of the valve member at a position which is located on an upstream side of the valve surface portion in a flow direction of the gas flowing through the annular fluid passage along the axial direction of the valve member,

wherein the liquid is supplied from the inside passage to the annular fluid passage through the communication port, and the liquid supplied to the annular fluid passage from the communication port is injected together with the gas flowing through the annular fluid passage, when the valve member is in a valve opening position,
wherein injection of the liquid and the gas is terminated, when the valve surface portion is seated on the valve seat portion to close the annular fluid passage,
wherein a cross-sectional passage area of a connecting passage portion is smaller than a cross-sectional passage area of an upstream-side passage portion,
wherein the connecting passage portion is a portion of the annular fluid passage, at which the communication port is connected to the annular fluid passage, and
wherein the upstream-side passage portion is another portion of the annular fluid passage, which is located at an upstream side of the connecting passage portion.

2. The fluid injection device according to claim 1 , wherein
the communication port is opened at the outer peripheral surface of the valve member at a position neighboring to the valve surface portion.

3. The fluid injection device according to claim 1 , wherein
the valve member has an outwardly expanded portion formed in a cylindrical shape having a center at an axis line of the valve member,
the inside passage is formed in an inside of the outwardly expanded portion, and
the communication port extends from the inside passage to an outer peripheral surface of the outwardly expanded portion.

4. The fluid injection device according to claim 1 , wherein
the communication port extends from the inside passage to the outer peripheral surface of the valve member in such a way that;
the communication port is in parallel to an axis line of the valve member, or
the communication port is inclined with respect to the axis line and comes closer to the axis line in the axial direction from the inside passage to the outer peripheral surface.

5. The fluid injection device according to claim 1 , wherein
a spiral groove is formed at the outer peripheral surface of the valve member in such a way that;
the spiral groove extends from an upstream side to a downstream side in an axis line of the valve member, and
the spiral groove has a spiral center at the axis line of the valve member.

6. The fluid injection device according to claim 1 , wherein
multiple communication ports are formed in the valve member,
an annular groove is formed at the outer peripheral surface of the valve member, and
each end of the communication port, which is opened at the outer peripheral surface of the valve member, is connected to each other via the annular groove.

7. The fluid injection device according to claim 1 , wherein
a biasing member is provided in the valve body for biasing the valve member in the axial direction to its valve closing position,
a pressure receiving surface is formed in the valve member for receiving pressure of the gas in the annular fluid passage, so that the valve member is pushed in the axial direction to its valve opening position, and
the valve member is moved to the valve closing position by a biasing force of the biasing member, or the valve member is moved against the biasing force to the valve opening position by a pushing force of the gas applied to the pressure receiving surface.

8. The fluid injection device according to claim 1 , wherein
a flow restricting unit is provided in the valve body for restricting a flow of the gas in a reverse direction from a downstream side to an upstream side.

9. A fluid injection system comprising;
the fluid injection device according to claim 1 ;
a gas supply unit for supplying the gas to the fluid injection device; and
a pressure control portion for controlling an operation of the gas supply unit to regulate the pressure of the gas to be supplied to the fluid injection device.

10. The fluid injection system according to claim 9 , wherein
the valve member is moved to the valve opening position, when the pressure of the gas in the annular fluid passage becomes higher than a predetermined value, and
the pressure control portion carries out a liquid discharging control during the valve member is in the valve closing position, according to which
the gas supply unit is so controlled that the gas having a pressure lower than the predetermined value is supplied to the fluid injection device,
the gas flowing in the annular fluid passage is supplied to the communication port and the inside passage, and
the liquid is discharged from the communication port and the inside passage to an outside liquid tank, which is located at an outside of the fluid injection device.

11. The fluid injection system according to claim 10 , further comprising;
a flow rate detecting portion for detecting a flow rate of the gas supplied to the fluid injection device,
wherein the pressure control portion determines during the liquid discharging control that the gas has reached the outside liquid tank, when the pressure control portion detects that the flow rate of the gas detected by the flow rate detecting portion is increased, and
the pressure control portion terminates the liquid discharging control, when it determines that the gas has reached the outside liquid tank.

12. The fluid injection system according to claim 10 , further comprising;
a pump-out load detecting portion for detecting a pump-out load of the gas supply unit for the gas to be supplied to the fluid injection device,
wherein the pressure control portion determines during the liquid discharging control that the gas has reached the outside liquid tank, when the pump-out load for the gas detected by the pump-out load detecting portion is increased, and
the pressure control portion terminates the liquid discharging control, when it determines that the gas has reached the outside liquid tank.

13. The fluid injection system according to claim 9 , wherein
the valve member is moved to the valve opening position, when the pressure of the gas in the annular fluid passage becomes higher than a predetermined value, and
the pressure control portion carries out a liquid sucking control, when starting a liquid injection operation of the fluid injection device and when the inside passage and the communication port of the fluid injection device are not filled with the liquid, in such a way;
the gas supply unit is controlled to supply the gas having a pressure higher than the predetermined value to the fluid injection device,
negative pressure is generated in the annular fluid passage at an

Assignees

• Denso Corp

Inventors

• Matsumoto Shuichi

Classifications

• F02M37/0052

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• Y02A50/20

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• F01N2610/1453

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• F01N3/2066 Primary

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