JPH0152564B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a flow rate adjustment device.

Flow regulators with translational flow regulators are described in particular in French patents 2180484 and 2180485.
It is stated in the specification of the No. This flow regulator is
sliding in a cylindrical casing with an upstream chamber at pressure P ₁ connected to the discharge side of the pump and a downstream chamber at pressure P ₂ connected directly or indirectly to the fuel injector using a flow regulating device It consists of a piston, which itself is equipped with an adjustment part and a translational adjustment valve. This adjustment part has a function of communicating the upstream chamber and the downstream chamber through an adjustment port whose flow passage cross-sectional area is controlled by sliding of a piston, and the adjustment valve is a cylindrical casing equipped with an upstream chamber and a downstream chamber. This slide valve is formed of a slide valve that can slide inside, and as the slide valve slides due to a change in the differential pressure P ₁ - _{P 2} detected by the differential pressure detector, the flow path of the adjustment port changes. Configured to control cross-sectional area. As a result, the differential pressure P ₁ - _{P 2} is maintained at a constant value.

In the two French patent specifications mentioned above, a constant displacement positive displacement pump is used and the regulating valve is
It functions to maintain the differential pressure within the flow regulator at a constant value by directing excess fuel existing between the pump and the flow regulator to another location when an increase in differential pressure is detected.

The flow rate of fuel supplied to the fuel injector is proportional to the product of the flow passage cross-sectional area of the adjustment port and the square root of the differential pressure, so if the flow passage cross-sectional area is proportional to the amount of piston movement, then the difference Maintaining the pressure at a constant value is one condition for the flow rate of fuel supplied to the fuel injector to vary linearly with the amount of piston movement.

In the field of controlling afterburning, the above-mentioned flow rate regulating device is known which uses a centrifugal pump to deliver a pressure that is almost independent of the flow rate. In this case, a regulating valve is used to adjust the flow rate to form an auxiliary restriction that acts on the pressure upstream or downstream of the flow regulator to change the differential pressure, thereby maintaining this differential pressure at a predetermined value depending on the flow rate. By placing it in series with the regulator, the differential pressure inside the regulator is kept constant.

On the other hand, French Patent No. 2,288,866 and the like mainly describe a flow rate regulating device having a flow rate regulator and a regulating valve incorporated therein.

An object of the present invention is to provide a flow rate adjustment device that can linearly change the flow rate of fluid depending on the cross-sectional area of a flow path.

According to the present invention, the object includes a first cylindrical member, and the first cylindrical member is inserted into the first cylindrical member so as to be movable along the longitudinal direction of the first cylindrical member, and the a second cylindrical member that cooperates with the first cylindrical member to define a first annular flow path for fluid; and a second cylindrical member that is inserted into the second cylindrical member so as to be movable along the longitudinal direction. a third cylindrical member that cooperates with the second cylindrical member to define a second annular flow path for the fluid; and a third cylindrical member for introducing the fluid into the second annular flow path. an inlet provided in the second cylindrical member; a communication port provided in the second cylindrical member to communicate the second annular flow path with the first annular flow path; an outlet provided in the first cylindrical member to discharge the fluid from the annular flow path;
In order to change the first flow passage cross-sectional area of the first annular flow passage in accordance with the translational displacement of the second cylindrical member, the first a first valve means provided in the annular flow path;
In order to change the second flow passage cross-sectional area of the second annular flow passage according to the amount of translational movement of the third cylindrical member, the second a first pressure of the fluid at the inlet of the first valve means and a second pressure of the fluid at the outlet of the first valve means; a comparison means provided in the second cylindrical member to compare the differential pressure with a predetermined pressure; and when the compared pressure difference is greater than the predetermined pressure, the second valve means The third cylindrical member is moved so as to reduce the second flow passage cross-sectional area, and when the compared differential pressure is smaller than the predetermined pressure, the second valve means In order to move the third cylindrical member so as to increase the cross-sectional area of the flow path, this is achieved by a flow rate adjustment device comprising a moving means provided in the second cylindrical member.

According to the invention, the comparison means determines the first pressure of the fluid at the inlet of the first valve means and the first pressure of the fluid at the inlet of the first valve means.
and the second pressure of the fluid at the outlet of the valve means may be compared to a predetermined pressure, and by the moving means;
When the compared pressure difference is larger than the predetermined pressure, the second valve means moves the third cylindrical member so as to reduce the second flow passage cross-sectional area, and the compared pressure difference is smaller than the predetermined pressure, the second valve means moves the third cylindrical member so as to increase the cross-sectional area of the second flow path, so that the differential pressure becomes the predetermined pressure. The fluid flow path may be varied linearly in response to the first flow cross-sectional area varied by the first valve means. In addition, a first annular flow path, a second annular flow path,
Since the inlet, the communication port, and the outlet are provided in the first cylindrical member, the flow rate adjustment device can be integrated, and repair and replacement of the flow rate adjustment device can be facilitated.

The invention will now be described in detail using non-limiting examples based on the accompanying drawings.

The flow regulating device 1 has a fuel inlet 2 connected to a discharge port of a centrifugal pump 3 and a fuel outlet 4 connected to a fuel injector (not shown) using the device 1.

The device 1 has a cylindrical casing 5 as a first cylindrical member inside a casing (not shown), and a piston 6 as a second cylindrical member slides inside the cylindrical casing 5.

The fuel discharged from the centrifugal pump 3 is supplied to the inlet 2 of the cylindrical casing 5, the inlet 7 of the piston 6, and the second
The liquid is introduced into the annular upstream chamber 9 through the annular chamber 40 as an annular flow path and the communication port 8 .

The fuel fills the upstream chamber 9 at a pressure P ₁ and enters the adjustment port 10 formed between the annular protrusion 11 of the cylindrical casing 5 and the conical surface 12 of the piston 6.
through the annular downstream chamber 13 at pressure P ₂ and finally exits through the outlet 4 to be supplied to a fuel injector (not shown).

Here, the upstream chamber 9 and the downstream chamber 13 constitute a first annular flow path according to the present invention. Further, the annular protruding portion 11 and the conical surface 12 constitute a first valve means according to the present invention.

In order to linearly change the flow rate of the fuel to be adjusted in proportion to the flow path cross-sectional area of the adjustment port 10,
The differential pressure P ₁ -P ₂ between the upstream and downstream sides of the adjustment port 10 is maintained at a constant value by the adjustment valve 14, which is a third cylindrical member and is a slide valve that slides inside the piston 6. Therefore, the regulating valve 14 moves along the flow path of the annular chamber 40 while changing its position according to the output pressure described later of the detector 15 as a comparison means for detecting the differential pressure P ₁ - P ₂ between the upstream chamber 9 and the downstream chamber 13. It is configured to reduce the cross-sectional area to some extent.

The pressure P ₁ upstream of the piston 6, that is, the pressure in the upstream chamber 9, is the pressure between the passage 16 and the external connection passage 17.
passage 18 and annular chamber 1 of cylindrical casing 5
9, the passage 20 of the piston 6, and the differential pressure detector 15
is sent to a front chamber 22 in the detector 15 via a chamber 21 surrounding the detector 15 . Front chamber 2
2 is defined by the bellows 23 of the detector 15 and the longitudinal hole of the slide valve 24.

The pressure P ₂ downstream of the piston 6, i.e. the pressure in the downstream chamber 13, is transmitted to the rear chamber 28 of the detector 15 via the passage 25 of the piston 6 and the annular groove 26 and passage 27 of the outer casing of the detector 15. .

A spring 29 is mounted in the rear chamber 28 against the slide valve 24 and is calibrated to maintain a predetermined pressure difference P ₁ -P ₂ at a predetermined fuel flow rate.

When the pressure P ₁ upstream of the piston 6 and in the forward chamber 22 of the detector 15 increases, the bellows 23 expands and the slide valve 24 is pushed to the right in the figure, so that the slide valve of the detector 15 24 annular grooves 3
0 and an annular groove 31 of the sleeve 32, in which the slide valve 24 is configured to slide, communicate with each other. As a result, the pressure P ₂ downstream of the piston 6 and in the rear chamber 28 of the detector 15 is applied as the output pressure of the detector 15 to the longitudinal passage 35 formed in the sleeve 32, the bottom chamber 36, and the sliding The longitudinal passage 27 of the valve 24 and the radial passage 38 of the sliding valve 24 communicate with each other annular grooves 31 and 3.
0 and is transmitted to the chamber 33 via a passage 39 connecting the annular groove 30 to the chamber 33 to be adjusted. The transmission of the pressure P ₂ mentioned above is shown in FIG. 2 by the black arrow.

A suitably calibrated spring 34 is provided in the chamber 33 and urges the regulating valve 14 to the right.

In this way, the chamber 33 is filled with pressure P ₂ downstream of the piston 6. A pressure P ₂ is present in the upstream chamber 9 of the piston 6 and in the annular chamber 40 , in the radial passage 41 , in the longitudinal bore 42
is smaller than the pressure P ₁ which is also present in the chamber 43 via P 1 . Therefore, the regulating valve 14 has a pressure P ₁
The annular chamber 40 is squeezed by moving to the left until the pressing force caused by the spring 34 and the pressure P ₂ become equal. and the pressure thus created
The value of the pressure difference P ₁ -P ₂ inside the piston ₆ is adjusted by lowering P 1 .

Conversely, when the pressure _P1 decreases, the bellows 23 contracts, and the slide valve 24 of the detector 15 moves to the left.
As a result, the annular groove 30 of the sliding valve 24 and the sleeve 32
The passage 44 and the passage 45 connected to the longitudinal hole 46 of the slide valve 24 communicate with each other. Therefore, the pressure P ₁ in the front chamber 22 is
As the output pressure of the passages 45, 44, the annular groove 3
0, and chamber 3 to be adjusted via passage 39
3. The transmission of the pressure P ₁ mentioned above is indicated by the white arrow in FIG.

Therefore, the annular chamber 40 and the chamber 4
The pressure inside chamber 3 and the pressure in chamber 33 are both P ₁
and become equal. As a result, the regulating valve 14
The pressure difference P ₁ -P ₂ is adjusted to a predetermined value in order to increase the flow passage cross-sectional area of the annular chamber 40 by being pushed to the right by the biasing force of the spring 34 .

Chamber 33, annular chamber 40, chamber 4
3 and the spring 34 constitute a moving means according to the present invention.

The slide valve 24, the sleeve 32, the passages 38, 45 and 39 and the annular groove 30 constitute the output means according to the invention.

The chamber 33, the annular chamber 40 and the chamber 43 constitute the application means according to the invention.

Although the invention has been described above in the field of reburning, it can of course also be applied to main adjustments of fuel flow.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of one specific example of the present invention, and FIG.
The figure is an enlarged sectional view of the portion shown in FIG. 1. 1...Flow rate adjustment device, 6...Piston, 9...
Upstream chamber, 13...Downstream chamber, 14...
Regulating valve, 15...Detector, 23...Bello, 24
...Sliding valve.

Claims (1)

[Scope of Claims] 1. A first cylindrical member; the first cylindrical member is inserted into the first cylindrical member so as to be movable along the longitudinal direction of the first cylindrical member; a second cylindrical member that cooperates with the cylindrical member to define a first annular flow path for fluid, and is inserted into the second cylindrical member so as to be movable along the longitudinal direction; a third cylindrical member that cooperates with the second cylindrical member to define a second annular flow path for the fluid; and a third cylindrical member for introducing the fluid into the second annular flow path. an inlet provided in the second cylindrical member, a communication port provided in the second cylindrical member to communicate the second annular flow path with the first annular flow path, and an inlet provided in the second cylindrical member; an outlet provided in the first tubular member for discharging the fluid from the channel; and a first flow in the first annular channel responsive to translational displacement of the second tubular member. a translational movement amount of a first valve means provided in the first annular flow path between the communication port and the discharge port and the third cylindrical member in order to change the cross-sectional area of the passage; a second valve means provided in the second annular flow path between the introduction port and the communication port to change the second flow path cross-sectional area of the second annular flow path according to the second annular flow path; and a pressure difference between a first pressure of the fluid at the inlet of the first valve means and a second pressure of the fluid at the outlet of the first valve means is compared with a predetermined pressure. a comparison means provided in a cylindrical member; and when the compared pressure difference is greater than the predetermined pressure, the second valve means decreases the second flow passage cross-sectional area. While moving the third cylindrical member, the second valve means increases the cross-sectional area of the second flow path when the compared pressure difference is smaller than the predetermined pressure. A flow rate adjustment device comprising a moving means provided in the second cylindrical member to move the cylindrical member. 2. The comparison means has an inside communicated with the inlet of the first valve means, an outside communicated with the outlet of the first valve means, and one end fixed to the second cylindrical member. 2. Device according to claim 1, characterized in that it consists of a closed bellows. 3 The comparison means outputs the second pressure when the compared pressure difference is larger than the predetermined pressure, and outputs the first pressure when the compared pressure difference is smaller than the predetermined pressure. 3. The apparatus according to claim 1 or 2, comprising an output means for outputting. 4. The moving means applies a force in a predetermined direction to the third pressure according to a pressure difference between the first pressure and one of the first pressure and the second pressure outputted by the output means. 4. The apparatus according to claim 3, comprising: a means for applying force to the cylindrical member; and a spring for biasing the third cylindrical member in a direction opposite to the predetermined direction.