CN2118192U

CN2118192U - Fluid four-way ratio flow valve

Info

Publication number: CN2118192U
Application number: CN 91229169
Authority: CN
Inventors: 阮健
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-11-19
Filing date: 1991-11-19
Publication date: 1992-10-07

Abstract

The utility model relates to a fluid four-way ratio flow valve. The utility model comprises a valve core, a valve seat, a left and a right end covers, a coupling, and a stepping motor, or a ratio rotary electromagnet, or a handle, wherein, the valve core forms a step type cylinder, through holes which are axisymmetrical are respectively arranged in the shoulders of the left and the right ends of the valve core, both ends of the valve seat are provided with a sensitive cavity, the valve seat is hollow in the axial direction, the valve seat is provided with an atmosphere port, a high pressure port, and a load port in the radial axial direction, the left and the right ends of the inner hole of the valve seat are respectively provided with a spiral groove, the spiral grooves are respectively communicated with the left and the right sensitive cavities of the valve, and the two through holes are respectively communicated with the atmosphere port and the high pressure port. The utility model has the advantages of simple structure, low manufacture cost, good linearity, and good repeat accuracy.

Description

Fluid four-way ratio flow valve

The utility model relates to the fluid proportional Flow valve, especially relates to fluid four-way proportional flow control valve.

Traditional twin-stage Flow valve such as servovalve etc., main valve is generally guiding valve, and pilot valve is the nozzle flapper valve, two valves are made of parts such as valve seat, spool, left and right sides end cap, springs respectively.The structure of two-stage is a separated.The requirement on machining accuracy of pilot valve is higher, and contamination resistance is poor, and the structure of whole valve is very complicated, and cost is also very expensive, thus generally only be used for war industry, can't large-scale popularization in civilian industry.

The purpose of this utility model provides a kind of from fluid four-way proportional flow control valve

Be illustrated below in conjunction with accompanying drawing.

Accompanying drawing is a fluid discrete type four-way proportional flow control valve schematic representation.

Fluid discrete type four-way proportional flow control valve comprises spool 4, valve seat 5, left and right sides end cap 6, shaft coupling 7, stepper motor 8. Its spool is the stairstepping Cylinder, has axial symmetry through hole 1,2 on the end shoulder about spool, and the valve seat two ends are provided with sensitive cavity, and the axial hollow of valve seat radially has atmospheric air port Pa, high-pressure mouth P₀, load port P₁、P ₂, end has helicla flute 3 and communicates with the left and right sides sensitive cavity of valve respectively about the valve seat endoporus, through hole 1 and high-pressure mouth P₀Communicate, through hole 2 communicates with atmospheric air port Pa. Spool has two freedoms of motion in valve seat orifice, it can be by shaft coupling by stepper motor or ratio rotary magnet or handle drives rotation on the one hand, and it can axially slide under the promotion of its both ends of the surface differential pressure action on the other hand.

Just in time be in the spiral fluted both sides at quiescent conditions lower through-hole 1,2, left and right sides sensitive cavity pressure equates that spool is motionless. When the stepper motor driving made spool counterclockwise turn over an angle θ by shaft coupling, left sensitive cavity communicated with atmospheric air port Pa by the left-hand screw groove, and right sensitive cavity is by right side helicla flute and high-pressure mouth P₀Communicate. This moment valve left and right sides sensitive cavity disequilibrium to Move to left, until helicla flute is between the through hole 1,2. After spool moved to left, then gas was through P₁Mouth enters load, gets back to then P₂Mouthful and enter atmosphere. If the stepper motor driven valve core turns to an angle θ clockwise, then process is opposite therewith for the action of spool and gas flow. The action of spool is equivalent to the function of a servo screw, the displacement X of spool_VAnd following relation is arranged between the corner:

X _V＝tgβγθ

X _V＝nΔθγtgβ

β-spiral chute lift angle;

N-umber of pulse (just transferring to counterclockwise) clockwise for negative;

γ-spool land radius;

Δ θ-step pitch.

The step number and the corner 1 that need only the control step motor from following formula as can be seen can obtain proportional with it valve port opening in proportion.

This valve has following advantage:

1. owing to constitute the twin-stage valve with the dual free dimension of spool, thus its structure compare with traditional two-stage servo-valve or Proportional valve very simple, and without centralizing spring.

2. have the good linearity and repeatability.

3. directly received pulse signal work need not the D/A conversion when linking with computer.

4. compare with the discrete type Proportional valve that transforms, have good speed of response.Experiment shows, with this spool from an X _VmTo X _VmJoint is received 24 pulse signals in the whole stroke, and only be 20ms actuation time.

5. this valve also can be used as the hydrovalve use.

6. this valve is much lower than the twin-stage Flow valve cost of any structure.

Claims

1, a kind of fluid four-way proportional flow control valve, it comprises spool [4], valve seat [5], left and right sides end cap [6], it is characterized in that it has shaft coupling [7], said spool is the stepped shaft Cylinder, having axisymmetric through hole [1], [2] on the end shoulder about spool, said valve seat two ends are provided with sensitive cavity, the axial hollow of valve seat, radially have atmospheric air port Pa, high-pressure mouth P ₀, load port P ₁, P ₂, end has spiral chute [3] and communicates with the left and right sides sensitive cavity of valve respectively about the valve seat endoporus, through hole [1] and high-pressure mouth P ₀Communicate, through hole [2] communicates with atmospheric air port Pa.

2, a kind of fluid four-way proportional flow control valve according to claim 1 is characterized in that said shaft coupling is provided with stepper motor (8), or ratio rotary magnet or handle.