Method and system for controlling automatic quantitative fluid supply

Patent metadata

Field	Value
Publication number	US-9766631-B2
Application number	US-201314360128-A
Country	US
Kind code	B2
Filing date	Apr 8, 2013
Priority date	Feb 25, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A method and a system for controlling automatic quantitative fluid supply are disclosed, and the method and the system automatically control the quantitative fluid supply by timing a period of time t required for introducing gas ( 20 ) into a sealing tank ( 4 ) in such a way that the pressure in the sealing tank ( 4 ) reaches a default value and calculating a period of time T, required for continuously introducing the gas ( 20 ) into the sealing tank ( 4 ) to extrude a fixed volume (V) of the fluid, from the time t, in the process of automatic quantitative fluid supply, so as to automatically control the switching-on and -off of a gas passage ( 1 ), overcome the impact of the reduction of the liquid level on the quantitative supply accuracy and guarantee the accuracy requirement of repeated quantitative supply.

First claim

The invention claimed is:

1. A method for controlling automatic quantitative fluid supply, comprising the following steps:
storing a certain amount of fluid in a sealing tank; timing a period of time t required for introducing gas into the sealing tank in such a way that the pressure in the sealing tank reaches a default value; and subsequently calculating a period of time T, required for continuously introducing the gas into the sealing tank to extrude a fixed volume of the fluid, from the time t, so as to automatically control switching-on and -off of a gas passage, wherein within time t and T, fluid passage for discharging the sealing tank is switched on, and no fluid flow out within time t,
wherein the time T is calculated from the time t according to a predetermined formula, and a step of obtaining the predetermined formula comprises:
repeatedly acquiring relationship between time t i required for introducing the gas into the sealing tank in such a way that the pressure in the sealing tank reaches the default value and time T i required for continuously introducing the gas into the sealing tank in such a way that the fluid of a fixed volume can be extruded from the sealing tank, namely T i =f(t i ).

2. The method for controlling automatic quantitative fluid supply according to claim 1 , wherein the step of obtaining the predetermined formula comprises:
100 , storing another certain amount of fluid in the sealing tank and marking i=0;
101 , introducing the gas into the sealing tank for the period of time t i , so that the pressure in the sealing tank reaches the default value, and storing t i ;
102 , continuously introducing the gas into the sealing tank for a period of time T i , so that the volume of the fluid extruded from the sealing tank can be a fixed value, and storing T i ;
103 , i+1;
104 , repeating the steps 101 , 102 and 103 when i≦n, wherein n is a number of times for repeatedly acquiring the relationship; and
105 , calculating p m in

T
i

=

f
⁡

(

t
i

)

=

ɛ
⁢

∑

m
=
0

n

⁢

p
m

⁢

t
i
m

 according to a plurality of groups of the t i and the T i when i>n, in which ε refers to a constant relevant to the kinematic viscosity of the fluid and p m is a coefficient.

3. The method for controlling automatic quantitative fluid supply according to claim 2 , wherein n≧4.

4. The method for controlling automatic quantitative fluid supply according to claim 1 , wherein the gas pressure in the gas passage is regulated according to the kinematic viscosity of the fluid stored in the sealing tank before the gas is introduced into the sealing tank.

5. A system for controlling automatic quantitative fluid supply, comprising a control device and a pressure sensor, the pressure sensor being configured to detect the pressure in a sealing tank, the control device comprising a timing module and a control module,
the timing module being configured to time a period of time t required for introducing gas into the sealing tank in such a way that the pressure in the sealing tank reaches a default value,
the control module being configured to calculate a period of time T, required for continuously introducing the gas into the sealing tank to extrude a fixed volume of the fluid after introducing the gas into the sealing tank for the period of time t, from the time t, so as to automatically control the switching-on and -off of a gas passage, wherein within time t and T, fluid passage for discharging the sealing tank is switched on, and no fluid flow out within time t,
wherein the control device further includes an acquisition module configured to repeatedly acquire relationship between time t i required for introducing the gas into the sealing tank in such a way that the pressure in the sealing tank reaches the default value and time T i required for continuously introducing the gas into the sealing tank in such a way that the fluid of a fixed volume can be extruded from the sealing tank, and hence obtain a predetermined formula Ti=f(t i ) so as to calculate the time T from the time t.

6. The system for controlling automatic quantitative fluid supply according to claim 5 , further comprising a regulation module configured to regulate the gas pressure in the gas passage according to the kinematic viscosity of the fluid stored in the sealing tank.

7. The system for controlling automatic quantitative fluid supply according to claim 6 , wherein the regulation module is a pressure regulating valve disposed in a midst of the gas passage.

8. The system for controlling automatic quantitative fluid supply according to claim 5 , wherein an electromagnetic valve is disposed on the gas passage; an instruction output end of the control module is connected with the electromagnetic valve; and the control module is configured to control the switching-on and -off of the electromagnetic valve according to the time T so as to automatically control the switching-on and -off of the gas passage.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Bu Bin
• Li Tailiang
• Chen Yimin
• Xiao Lei

Classifications

• G05D7/0635 Primary

  by action on throttling means (G05D7/0688, G05D7/0694 take precedence) · CPC title

• Y10T137/0396

  Involving pressure control · CPC title

• Y10T137/3115

  Gas pressure storage over or displacement of liquid · CPC title

• Y10T137/3127

  With gas maintenance or application · CPC title

• Y10T137/86389

  Programmer or timer · CPC title