CN103076815A

CN103076815A - High-accuracy linear control device for fluid flow

Info

Publication number: CN103076815A
Application number: CN2012105710455A
Authority: CN
Inventors: 郭庆; 张大为; 胡鸿志; 徐翠锋; 胡锦泉; 贾楠
Original assignee: Guilin University of Electronic Technology
Current assignee: Guilin University of Electronic Technology
Priority date: 2012-12-26
Filing date: 2012-12-26
Publication date: 2013-05-01
Anticipated expiration: 2032-12-26
Also published as: CN103076815B

Abstract

The invention discloses a high-accuracy linear control device for fluid flow, comprising a fluid input pipeline with an electronic control valve, a closed fluid buffer container, a pressure sensor, a fluid pressure control system, a piston type fluid linear valve component and a fluid output port. The fluid flows through the input pipeline and the fluid buffer container, and flows out through the fluid output port, the control system controls the switching value of the electronic control valve through collecting a signal from the pressure sensor mounted on the buffer container, so as to stabilize the fluid pressure inside the buffer container, so that the fluid flow linear control with small flow rate, high accuracy and stable instantaneous flow rate is realized.

Description

The high-precision linear control device of fluid flow

Technical field

The present invention relates to the flow control field of fluid, be specifically related to a kind of high-precision linear control device of fluid flow.

Background technology

Existing fluid flow control generally all is adoption rate adjustment type or switching mode electric control valve control fluid flow, because the hydrodynamic pressure of controlling is unstable, cause the unstable of institute's flow control body output flow velocity, although can reach by the state of autocontrol valve the stable output of average discharge, be difficult to accomplish the particularly stable output during low discharge of instantaneous delivery.For some special dimensions, require to accomplish low discharge, high precision, the stable fluid flow control of instantaneous delivery, existing electric control valve and volume control device or do not reach requirement, or the cost price of paying is too high.

Summary of the invention

The object of the invention is to provides a solution for above-mentioned the deficiencies in the prior art, reaches low discharge, high precision, the stable fluid flow Linear Control of instantaneous delivery, that is: a kind of high-precision linear control device of fluid flow.

Fluid flow high-precision linear control device of the present invention comprises the fluid input tube road with electric control valve, airtight fluid cushion container, pressure transducer, hydrodynamic pressure control system, piston type fluid Linear valve assembly.

Described fluid input tube road with electric control valve is connected with the fluid cushion seal of vessel, and the electric control valve control signal comes from the hydrodynamic pressure control system.

It is the plane that described airtight fluid cushion container has the outside of a sidewall at least, has the elongated rectangular through-hole of a level on this sidewall, is provided with the gas outlet pipe of a belt switch device at the top of fluid cushion container highest point.

Described pressure transducer hermetically passing also is fixed on the fluid cushion chamber wall, and the pressure transducer probe stretches in the interior fluid of fluid cushion container, and the pressure transducer output signal is delivered to the hydrodynamic pressure control system.

Described piston type fluid Linear valve assembly is comprised of stepper motor, spindle gear, piston, piston/cylinder.It is the plane that piston/cylinder has the outside of a sidewall at least, has the elongated rectangular through-hole of a level on this sidewall, the xsect congruence of the rectangular through-hole on this rectangular through-hole and the fluid cushion container side wall.Piston length is greater than the long limit of rectangular through-hole xsect, and piston and piston/cylinder bore seal are slidingly matched, and piston is driven by spindle gear by stepper motor, and stepper motor is controlled by the hydrodynamic pressure control system.The inner chamber all-pass of piston/cylinder, an end opening of inner chamber is used for the piston driver transmission torque, and the other end is as fluid outlet.

The piston/cylinder of described piston type fluid Linear valve assembly is fixedly connected with and makes the rectangular through-hole on this piston/cylinder sidewall to dock with the rectangular through-hole sealing on the fluid cushion container side wall with the fluid cushion container.

Described hydrodynamic pressure control system is made of programmable logic controller (PLC) spare, perhaps adopts other to have the control system of identical function.

Description of drawings

Fig. 1 is the high-precision linear control device structural representation of fluid flow.Among the figure:

1. fluid input tube road; 2. fluid cushion container; 3. pressure transducer; 4. gas outlet pipe

5. stepper motor; 6. spindle gear; 7. piston; 8. piston/cylinder; 9. fluid outlet.

Embodiment

The invention will be further described below in conjunction with drawings and Examples.

Described piston type fluid Linear valve assembly is comprised of stepper motor, spindle gear, piston, piston/cylinder.It is the plane that piston/cylinder has the outside of a sidewall at least, has the elongated rectangular through-hole of a level on this sidewall, the xsect congruence of the rectangular through-hole on this rectangular through-hole and the fluid cushion container side wall.Piston length is greater than the long limit of rectangular through-hole xsect, and piston and piston/cylinder bore seal are slidingly matched, and piston can be opened or complete shutoff or part shutoff piston/cylinder rectangular through-hole fully, reaches the Linear Control of flow.Piston is driven by spindle gear by stepper motor.The inner chamber all-pass of piston/cylinder, an end opening of inner chamber is used for the piston driver transmission torque, and the other end is as fluid outlet.

In this example, inner chamber one end of piston/cylinder has a tank circuit, for the spindle gear driven plunger of another kind of form designed.

Fluid enters airtight fluid cushion container by the fluid input tube road with electric control valve, the complete shutoff piston/cylinder of piston this moment rectangular through-hole, after fluid is filled buffer container, internal fluid pressure reaches setting value, the signal controlling electric control valve control that the hydrodynamic pressure control system is sent according to pressure transducer is closed, if having residual gas to discharge by gas outlet pipe in the buffer container.

According to need of work, hydrodynamic pressure control system output control signal, stepper motor drives piston to the precalculated position by spindle gear, the buffer container inner fluid flows out by the piston/cylinder rectangular through-hole of opening, the buffer container fluid pressure reduces, the signal controlling electric control valve fluid replacement that the hydrodynamic pressure control system is sent according to pressure transducer, electric control valve is under the control action of hydrodynamic pressure control system, all the time follow the variation of piston/cylinder rectangular through-hole fluid flow and adjust, keep setting value to keep the buffer container fluid pressure.

Because it is constant that the buffer container fluid pressure is kept, the rate of flow of fluid that flows out the piston/cylinder rectangular through-hole is also constant when the via openings degree is constant, reaches low discharge, high precision, the stable fluid flow Linear Control of instantaneous delivery.

Claims

1. A high-precision linear control device for fluid flow, including a fluid pressure control system, a fluid input pipeline with an electronically controlled valve, characterized in that it also includes a closed fluid buffer container, a pressure sensor, and a piston-type fluid linear valve assembly The fluid input pipeline with the electric control valve is sealed and connected with the fluid buffer container, and the control signal of the electric control valve comes from the fluid pressure control system; the pressure sensor is sealed and fixed on the wall of the fluid buffer container, and the pressure sensor probe Extending into the fluid in the fluid buffer container, the output signal of the pressure sensor is sent to the fluid pressure control system; each side wall of the closed fluid buffer container and the piston type fluid linear valve assembly has a horizontal slender rectangle with the same cross section The through hole, the airtight fluid buffer container and the piston type fluid linear valve assembly are sealed butted through the through holes on the respective walls.

2. The high-precision linear control device as claimed in claim 1, characterized in that: the outside of at least one side wall of the airtight fluid buffer container is a plane, and a horizontal elongated rectangular through hole is opened on the plane side wall , At the highest point of the upper part of the closed fluid buffer container, there is an air discharge pipe with a switch device.

3. The high-precision linear control device according to claim 1 or 2, wherein the piston-type fluid linear valve assembly is composed of a stepping motor, a screw drive, a piston, and a piston cylinder, and the piston cylinder The exterior of at least one side wall of the body is a plane, and a horizontal slender rectangular through hole is opened on the plane side wall. The inner cavity of the cylinder body is fully open, one end of the inner cavity is used for the torque transmission of the piston drive device, and the other end is used as a fluid output port, and the piston is driven by a stepping motor through a screw drive device.