WO1999024743A1 - Soupape a tiroir pour fluides possedant une sensibilite peu elevee par rapport a la puissance du flux - Google Patents

Soupape a tiroir pour fluides possedant une sensibilite peu elevee par rapport a la puissance du flux Download PDF

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Publication number
WO1999024743A1
WO1999024743A1 PCT/JP1998/004415 JP9804415W WO9924743A1 WO 1999024743 A1 WO1999024743 A1 WO 1999024743A1 JP 9804415 W JP9804415 W JP 9804415W WO 9924743 A1 WO9924743 A1 WO 9924743A1
Authority
WO
WIPO (PCT)
Prior art keywords
spool
port
fluid
valve
flow
Prior art date
Application number
PCT/JP1998/004415
Other languages
English (en)
Japanese (ja)
Inventor
Mohamed Ahmed Elgamil
Original Assignee
El-Debs, Sobhi, Fouad
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EG119897A external-priority patent/EG21968A/xx
Priority claimed from EG19098A external-priority patent/EG21969A/xx
Application filed by El-Debs, Sobhi, Fouad filed Critical El-Debs, Sobhi, Fouad
Publication of WO1999024743A1 publication Critical patent/WO1999024743A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides

Definitions

  • Controlling fluids plays an essential role in many applications in a wide range of activities from those required in everyday life to industrial activities. In the industry, the need to control fluids can be seen in power plants, distribution networks, hydraulic and aerodynamic systems.
  • the key elements that control fluid flow characteristics such as direction, pressure and Z or velocity are valves. Whichever of these properties the valve controls, it consists of a sliding, mounting, or type of valve element that splits the flow. The valve element moves to control the area through which the fluid passes according to the properties being controlled (pressure, flow rate,..., Etc.).
  • the force required to move the valve element must overcome various types of drag, such as fluid pressure, flow, friction, and inertia.
  • various types of drag such as fluid pressure, flow, friction, and inertia.
  • Spool valves are widely used in hydraulic and power control valves. When the spool is driven by a solenoid or torque motor, the flow force limits the maximum flow rate through the valve, and the flow of the motor is limited by the power of the motor, resulting in a large pressure drop. Pass with. In some cases, it may be necessary to design the valve in several stages where the first pilot valve drives the main valve through the middle valve. Multi-stage valve It is used so that the valve element can overcome huge resistance in the main stage.
  • the most accurate hydraulic and pneumatic valves are proportional and servo valves, and at least the main stage is usually a spool type. In such cases, the effect of flow force on the valve's capacity and dynamics characteristics is more important than with other types.
  • the spool valve consists of a spool with some runt 'passing through the inside of a cylindrical bore.
  • the lands are divided into ports of fluid interspersed along the holes, and as the spool moves, the chambers between the lands couple between the different ports.
  • Two combined port - one DOO generally, the gap between the land and the cylinder bore of ⁇ spool having one O orifice region controlled by the movement of the spool is small, the The flow between the chambers around the land is obstructed.
  • the driver To move the spool, the driver must overcome various types of forces, such as fluid pressure, flow, friction, and kinetic forces. Fluid force is often the dominant drag force that limits the volume i of a valve. Reducing the flow force is useful in increasing the maximum allowable flow rate and reducing the number of valve stages.
  • the third flow force is due to narrowing the flow to a narrow orifice with a land controlling the orifice. This narrowing reduces the pressure applied to this land to less than the pressure applied to the land on the other side of the chamber. This pressure difference creates a closing force that blocks the driving force. Later flows refer to the general case of static flows acting on a suburb. If the flow is reversed, that is, the chamber flows through the orifice, the first two forces exchange their actions, but the same net result of the three static forces is obtained.
  • the inserted small particles carry a second closing static flow force caused by the change in direction from radial to axial as fluid flows into the valve. Try to support yourself. The spool is then only exposed to a second static fluid force which attempts to open the valve, and a third fluid force which forces the valve. The result of these two types of forces is the third closing fluid force minus the second opening fluid force. This is due to the flow force acting in the conventional structure (third Flow force) is partially augmented, and the resulting flow force acting on the spool is reduced. For critical valve movements that depend on geometric dimensions, the resulting static flow force is zero and negative (open nature), which exceeds this important valve movement. If the ratio of the area of the orifice to the area of the cross section of the chamber is kept below a certain design limit, which is a normal practice of design, over-utilization and instability can be avoided.
  • a two-land spool is used if precautionary measures are taken to avoid over-compliance. This leads to a significant reduction in spool performance.
  • the diameter of the spool can be enlarged, and the spool itself can be made hollow. All such improvements are made by the driver (pilot pressure, electric motor).
  • Connection rods, etc.) and sensors (sensor connection rods, etc.) can be connected to the spool.
  • An electromagnetic circuit can be provided to directly control the position of the spool between the two coils. The same electromagnetic circuit can be used to sense the position of the spool. This design adjusts the slope (port width) of the return orifice area to be greater than the slope (port width) of the supply orifice area (port mismatch orifice) to improve system efficiency and static and dynamic performance. ) Is free.
  • the flow forms an ejecting jet and leaves the orifice with an axial tilt of motion.
  • the acceleration of the fluid from low to high speed in the injection is a pressure
  • the rate of change (force) of the fluid motion S equal to the third force based on the difference is linked to Min. Due to the tilt of the injection, the axial component of this force hinders the spool driver.
  • the angle of injection ranges from about 21 'for small opening lengths to 69 ° for opening lengths in which ordinary servovalves operate.
  • the length of the opening should be equal to the displacement of the spool as input in a critically wrapped valve, and should be considered as the other case in the case of overwrap or under rub.
  • the static flow force on the feed side can be reduced without affecting the positive reduction by adjusting the flow injection angle at the outlet to 90 'instead of the insert mentioned above. .
  • the adjustment is made by a piece fixed to the land of the spool facing the exit lip so that the net flow exit angle after leaving the sable is 90 °. Since the axial force depends on the axial component of the outgoing angle, the flow force on the supplied side is theoretically very small.
  • Figure 1 shows a conventional valve as the flow exits the orifice
  • the flow force acting on the spool is shown in the same manner as the flow line at.
  • the force is shown in the two figures for the same section.
  • FIG. 2 shows the flow force acting on the spool as well as the streamline in a new valve with an insert added to the conventional valve. The force is shown in the two figures for the same section.
  • FIG. 3 shows the four-way valve in actuated position 3 with an insert, with the spool displaced due to the effect of the by-pass pressure.
  • FIG. 4 shows the four-way valve in the working position 3 with the adjustment piece, with the spool displaced by the effect of the pilot force.
  • FIG. 1 shows the cross section of the valve, the streamline and the static flow force as the flow exits through the orifice.
  • the valve consists of a valve body (1) and a spool (2). The flow passes through one port into the spool area, changes direction twice and then through the spool area (3). Due to the narrow discharge area (orifice), the flow is constricted by the land of the spool.
  • the pressure applied to the land (4) is smaller than the pressure applied to (5). This pressure differential results in a fluid force trying to close the valve (the third controversial fluid force described above). The change in flow direction and the amount of interlocking flow into the spool area creates another closing flow force (in the figure,
  • FIG. 2 shows the pulp with the light inserts of the rafts and T (3) added.
  • the insert is fixed to the valve body (1) and is connected between the inflow port and the land of the rear spool.
  • the present invention is based on the force (6) (described above with reference to FIG. It is not supported by the spool land. Therefore, only the force (7) in addition to the narrowing force (5) still acts on the sub-bar. The net result of these two opposing forces is different-and the effect of static flow forces is diminished.
  • the net controversial fluid force is the sum of the three static fluid forces on each side where flow flows in and out through the two control orifices. In other words, there are six static fluid forces acting on both sides, and these static forces are reduced to five dynamic fluid forces by the insert. If the spool moves further, the flow will accelerate in this chamber. This acceleration produces a reaction force in direction similar to the static force (6) and proportional to the speed at which the spool moves. Similar to the static force (6), this dynamic destruction is shielded from acting on the spool by the insert.
  • FIG. 3 shows the working position in which the other pieces (3) have been added to support all the forces (6, 7, and negative damping) on the side where the flow enters through the orifice (return or tank side). Shows four directions bar / rev in one ⁇ 3.
  • a small piece (10) is added to cut off the passage where the flow changes its fill and acts on the spool. Exposures that are exposed over the jet from the spool are minimized, and the slope of the elbow is used to direct the flow into the changing path. This small piece (10) Is used to prevent turbulence developed after leaving the orifice from returning to the spool and affecting it.
  • the spool (2) is a hollow spool of two land.
  • This configuration reduces the inertia of the spool and allows the spool diameter to be increased. This enlargement is useful for reducing the percentage of open ports occupied on the outer perimeter of the body to prevent the land from stagnating at the ports.
  • (1) is made of non-magnetic material, and in addition to the external coil, the pieces (9), inserts (8), spool (2) and all of them for controlling the position of the spool! It can be formed in a magnetic circuit.
  • the position is sensed by the electromagnetic circuit itself or by other sensors through the coupling rod (11) described above.
  • the enlarged spool diameter should return more than the slope of the supply orifice area (port width) to improve system efficiency, static and dynamic performance (tank)
  • the slope of the orifice area (port width) Improve the possibility of adjusting to increase.
  • FIG. 4 shows the valve when the jetting angle of the flow from the supply chamber 1 is adjusted to 90 ° by the adjusting piece (12).
  • the change in the net flow momentum in the axial direction is theoretically zero, as the incoming flow leaves radially.
  • This improvement reduces the static flow force in the candy champer without changing the positive damping flow force. Therefore, the subject of the discussed negative decay is not a problem in this case, and a new driving method is applied as shown in FIG. [Industrial applicability]
  • the spool valve of the present invention is capable of reducing the fluid force acting on the spool as a resistance in erecting the valve.
  • the valve can be driven by a small driver without deteriorating the dynamic performance of the valve, and a valve system with such commercial efficiency can be achieved without incurring high costs. .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne une soupape à tiroir qui comprend un tiroir mobile axialement et comportant deux arêtes à ses deux extrémités, un corps de soupape étant disposé de manière coaxiale avec le tiroir, à l'extérieur de ce dernier. L'ouverture et la fermeture de la soupape se fait en fonction des mouvements du tiroir. La soupape à tiroir comporte également des inserts et des éléments en fragments qui interagissent avec le tiroir pour conduire le fluide et couper la puissance de flux qui déstabilise son fonctionnement. Grâce aux inserts, on coupe la puissance de flux indésirable d'un fluide traversant le corps de soupape d'un orifice à l'autre.
PCT/JP1998/004415 1997-11-12 1998-09-30 Soupape a tiroir pour fluides possedant une sensibilite peu elevee par rapport a la puissance du flux WO1999024743A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
EG1997-11-1198 1997-11-12
EG119897A EG21968A (en) 1997-11-12 1997-11-12 Spool valve of low sensitivity to flow forces
EG18998 1998-02-17
EG1998-2-189 1998-02-17
EG1998-2-190 1998-02-17
EG19098A EG21969A (en) 1998-02-17 1998-02-17 Hydrolic spool valves of rectified jet angle hybrid values and their drive

Publications (1)

Publication Number Publication Date
WO1999024743A1 true WO1999024743A1 (fr) 1999-05-20

Family

ID=27222581

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1998/004415 WO1999024743A1 (fr) 1997-11-12 1998-09-30 Soupape a tiroir pour fluides possedant une sensibilite peu elevee par rapport a la puissance du flux

Country Status (1)

Country Link
WO (1) WO1999024743A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03121277U (fr) * 1990-03-27 1991-12-12
JPH0411980U (fr) * 1990-05-21 1992-01-30

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03121277U (fr) * 1990-03-27 1991-12-12
JPH0411980U (fr) * 1990-05-21 1992-01-30

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