CN101315135A - Rotating plate type pneumatic digital valve - Google Patents

Abstract

A rotating plate type pneumatic digital valve comprises a rotating plate, a valve cavity and a driving motor. The rotating plate is positioned at one side of the valve cavity, the other side of the valve cavity is fixedly connected with the driving motor, the output shaft of the driving motor passes through the valve cavity, the rotating plate is installed on the output shaft of the driving motor, a gas transfer port is formed on the side face of the valve cavity, a gas inlet port and a gas exhaust port with the same size are formed on the end surface of the side of the valve cavity close to the rotating plate, the circle centers of the gas inlet port and the gas exhaust port are positioned on a concentric circle with the center of the rotating plate as a center of the circle, one half of the outer profile of the rotating plate is in the shape of a semicircle, the other half of the outer profile of the rotating plate is in the shape of an Archimedean spiral, one end of the Archimedean spiral is connected with one end of the semicircle, the other end of the Archimedean spiral is connected with the other end of the semicircle via an auxiliary semicircle, the opening of the auxiliary semicircle toward the Archimedean spiral, and the diameter of the auxiliary semicircle is equal to the diameter of the gas inlet port. The inventive rotating plate type pneumatic digital valve has the advantages of simple structure and low cost; and can directly realize digital control.

Description

Rotating plate type pneumatic digital valve

Technical field

The present invention relates to Pneumatic Digital Servo Valve, be applicable to the pneumatic control occasion.

Background technique

Pneumatics development in recent years is rapid, and foreign enterprises improves constantly own product competitive ability and seeks to achieve success through good quality in the process of developing new product.Original traditional pneumatic element is owing to reasons such as structure falls behind, volume is big, poor reliability are replaced by emerging pneumatic element gradually.

For high speed, highi degree of accuracy pneumatic control field, traditional Electromagnetic Drive servovalve involves great expense, to the environmental requirement height, and delivery pressure is little, can not realize Direct Digital control in control, therefore, as the pneumatic control components of experimental system certain defective is arranged with traditional servovalve.

Summary of the invention

For the complex structure, the cost height that overcome the existing digital servovalve, can not directly realize numerically controlled deficiency, the invention provides a kind of simple in structure, cheap, can directly realize numerically controlled rotating plate type pneumatic servovalve.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of rotating plate type pneumatic digital valve, comprise flap, valve pocket and drive motor, flap is positioned at a side of valve pocket, the opposite side of described valve pocket is fixedlyed connected with drive motor, the output shaft of described drive motor passes valve pocket, described flap is installed on the output shaft of drive motor, side at described valve pocket has transfer port, have size identical input hole and exhaust port at the valve pocket end face that is positioned near the flap side, it is on the concentric circle in the center of circle that the center of circle of described input hole and exhaust port is positioned at the flap center, half semicircular in shape of described flap external frame, second half of described flap external frame is Archimedes spiral, one end of described Archimedes spiral is connected with a described semicircular end, the other end of described Archimedes spiral is connected with the described semicircular the other end by auxiliary semicircle, the opening of described auxiliary semicircle is towards described Archimedes spiral, and the equal diameters of the diameter of described auxiliary semicircle and input hole.

Further, the line in the center of circle of described input hole and the center of circle of exhaust port is by the center of circle of described flap, and for this structural type, the cambered surface that described Archimedes spiral covers is slightly less than semicircle.

Further again, described valve pocket comprises cylinder and valve seat, and described valve seat and cylinder are tightly connected, and is provided with exhaust port and input hole on described valve seat, is provided with transfer port on cylinder.

Technical conceive of the present invention is: rotating plate type pneumatic digital valve mechanical structure part, mainly form by motor, flap and valve pocket three parts.Motor can adopt stepper motor, various motors such as direct current generator, and it is worked under the effect of control signal and drives flap and rotates.

Flap and motor shaft link, and its shape is made up of the different curve of the right and left, and the left side is a semicircular structure, and its diameter is than cylinder bore smaller (belonging to Spielpassung); The right is that curve and one section circular arc through particular design constitutes, wherein, curve is the Archimedes spiral that obtains through after a series of mathematical derivation and the experiment correction, is characterized in, according to the size of corner, to realize the linearity control of input hole (or exhaust port) degree of opening.And the radius of semi-circle is identical with input hole (and exhaust port).

Valve pocket is made up of valve seat and cylinder, plays to connect and the effect of sealing, can be equipped with the sealing configuration of rubber or other pattern between the three, and is connected and fix with corresponding screw or nut.Valve seat is provided with exhaust port and input hole, and the position at its center, hole is as the criterion with flap, and requirement is when flap turns to any position, to have and have only a hole and valve pocket to connect.Cylinder is provided with delivery outlet, as the delivery outlet of working gas.

Beneficial effect of the present invention mainly shows: 1, simple for structure, compact, and cheap; 2, in control, realize Direct Digital control, can strict control valve mouth pressure output, providing of pressurized gas that rule is controlled is provided.

Description of drawings

Fig. 1 is the structural representation of rotating plate type pneumatic digital valve.

Fig. 2 is the partial sectional view of Fig. 1.

Fig. 3 is the A-A sectional view of Fig. 1.

Fig. 4 is the schematic representation of flap.

Embodiment

Below in conjunction with accompanying drawing the present invention is further described.

With reference to Fig. 1～Fig. 4, a kind of rotating plate type pneumatic digital valve, comprise flap, valve pocket and drive motor 4, flap is positioned at a side of valve pocket, the opposite side of described valve pocket is fixedlyed connected with drive motor 4, the output shaft of described drive motor 4 passes valve pocket, described flap is installed on the output shaft of drive motor 4, have delivery outlet 5 in the side of described valve pocket, have size identical input hole 6 and exhaust port 7 at the cylinder end face that is positioned near the flap side, it is on the concentric circle in the center of circle that the center of circle of described input hole 6 and exhaust port 7 is positioned at the flap center, half semicircular in shape of described flap external frame, second half of described flap external frame is Archimedes spiral, one end of described Archimedes spiral is connected with a described semicircular end, the other end of described Archimedes spiral is connected with the described semicircular the other end by auxiliary semicircle, and the opening of described auxiliary semicircle is towards described Archimedes spiral, and the equal diameters of the diameter of described auxiliary semicircle and input hole.

In accompanying drawing 1, the center of circle of the center of circle of input hole 6 and exhaust port 7 is that the cambered surface in the center of circle is slightly less than semicircle with the flap center, when input hole is positioned at Archimedes spiral one end, input hole begins to import gas, exhaust port is positioned at the Archimedes spiral the other end and is connected on the semicircle, i.e. relief opening complete closed just.

Or: the line in the center of circle of the center of circle of described input hole 6 and exhaust port 7 is by the center of circle of described flap, and for this structural type, the cambered surface that described Archimedes spiral covers is slightly less than semicircle.

Described valve pocket comprises cylinder 8 and valve seat 2, and described valve seat 2 and cylinder 8 are tightly connected, and is connected by screw 1 between valve seat 2 and the cylinder 8 and fixes, and is provided with exhaust port and input hole on described valve seat 2, is provided with transfer port on cylinder 8.

Fig. 1 is a rough schematic of rotating plate type pneumatic valve, and Fig. 4 is a work schematic representation of present embodiment (flap).In real work, by the motor among Fig. 1, drive the flap rotation by motor shaft, because the special construction of flap, input hole and exhaust port have only one to be connected with air chamber, and air chamber directly links to each other with pneumatic apparatus by delivery outlet, and at synchronization, the working state of valve has only one: ventilation or venting.

In Fig. 4, A～F is respectively flap and rotates the different moment, the unlimited size (shown in shadow area) of pore.To the E position, along with flap turns over different angles, the unlimited size of pore is linear change, reaches the purpose of control gaseous flow with this from the A position.

The Archimedes spiral equation is the equation that is positioned under the polar coordinates, and its general representation is ρ=a θ.In the curve design on flap, this general representation is expanded, increased quadratic term and constant term, its representation becomes ρ=a θ ²+ b θ+c (formula 1).In concrete mathematical derivation, carried out certain mathematical processing, promptly adopted flap not change, the rotate method of plate center rotation of input hole and exhaust port.As in Fig. 4, setting up with the center of circle is the right angled coordinates of initial point, and then the representation of input hole is (x-x ₀) ²+ (y-y ₀) ²=R ²(formula 2), wherein (x ₀, y ₀) be the centre coordinate in hole, satisfy equation of a circle under the right angled coordinates, x is promptly arranged ₀ ²+ y ₀ ²=r ²(formula 3).Archimedes spiral equation after will expanding simultaneously is rewritten into the form under the right angled coordinates.Can solve curve and two round intersecting point coordinate (x behind the three formula simultaneous ₁, y ₁) and (x ₂, y ₂).At last it is carried out can getting behind the integration relation equation of area and angle value θ.After obtaining this relation equation, after the process actual tests is carried out process of fitting treatment and rational the modification to it again, can obtain the linear equation that is used to control.As, work as R=175, during r=25, curvilinear equation is $\mathrm{\ρ}=\frac{50}{\mathrm{\π}}\mathrm{\θ}+175,$ The relation equation of area and angle value θ (promptly be used to control linear equation) is s=-13.782 θ+1011.7.

Claims (3)

1, a kind of rotating plate type pneumatic digital valve, it is characterized in that: described pneumatic digital valve comprises flap, valve pocket and drive motor, flap is positioned at a side of valve pocket, the opposite side of described valve pocket is fixedlyed connected with drive motor, the output shaft of described drive motor passes valve pocket, described flap is installed on the output shaft of drive motor, side at described valve pocket has transfer port, have size identical input hole and exhaust port at the valve pocket end face that is positioned near the flap side, it is on the concentric circle in the center of circle that the center of circle of described input hole and exhaust port is positioned at the flap center, half semicircular in shape of described flap external frame, second half of described flap external frame is Archimedes spiral, one end of described Archimedes spiral is connected with a described semicircular end, the other end of described Archimedes spiral is connected with the described semicircular the other end by auxiliary semicircle, the opening of described auxiliary semicircle is towards described Archimedes spiral, and the equal diameters of the diameter of described auxiliary semicircle and input hole.

2, step type pneumatic digital valve as claimed in claim 1 is characterized in that: the line in the center of circle of described input hole and the center of circle of exhaust port is by the center of circle of described flap.

3, step type pneumatic digital valve as claimed in claim 1 or 2 is characterized in that: described valve pocket comprises cylinder and valve seat, and described valve seat and cylinder are tightly connected, and is provided with exhaust port and input hole on described valve seat, is provided with transfer port on cylinder.

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