Method and system for controlling automatic quantitative fluid supply

• US 9,766,631 B2
• Filed: 04/08/2013
• Issued: 09/19/2017
• Est. Priority Date: 02/25/2013
• Status: Expired due to Fees

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Bu, Bin, Li, Tailiang, Chen, Yimin, Xiao, Lei
• Primary Examiner(s): Fristoe, Jr., John K
• Assistant Examiner(s): Trinidad-Borges, Josephine
• Application Number:
  US14/360,128
• Publication Number:
  US 20150220087A1
• Time in Patent Office: 1,625 Days
• Field of Search: 137206, 137209, 118691, 118692, 118684, 118696, 118699
• CPC Class Codes: G01F 13/006 measuring volume in function of time
• CPC Class Codes: G05D 7/00 Control of flow level control G05D9/00; control of flow ratio G05D11/00
• CPC Class Codes: G05D 7/0635 by action on throttling means G05D7/0688, G05D7/0694 take precedence
• CPC Class Codes: Y10T 137/0396 Involving pressure control
• CPC Class Codes: Y10T 137/3115 Gas pressure storage over or displacement of liquid
• CPC Class Codes: Y10T 137/3127 With gas maintenance or application
• CPC Class Codes: Y10T 137/86389 Programmer or timer

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.

Claims

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

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.