KR20140144041A - Method for controlling flow rate of liquid or gas - Google Patents

Abstract

The present invention relates to a flow rate control method for a liquid or a gas, which is capable of controlling the flow rate of liquid or gas precisely by controlling the flow rate using a module and which allows the module to be used as a pump in case of emergency, wherein the module consists of multiple diaphragm valves connected to each other and controlling the flow rate of the liquid or the gas. According to the present invention, a flow rate control method for liquid or gas comprises: a step of connecting an inlet pipe receiving liquid or gas and an outlet pipe discharging the liquid or the gas to the inlet and the outlet of at least one diaphragm valve allowing the liquid or the gas at a high temperature to flow therein, capable of sterilizing, and coupled to form a module in series; a step of controlling the flow rate of the liquid or the gas flowing into the inlet when controlling the solenoid valve of the diaphragm valve by a control signal according to a target value and a time value predetermined by the control part; a step of allowing the control part to compare the target value and the measurement value of the flow rate measured by a flowmeter or a scale connected between the diaphragm valve and the control part in order to determine whether or not the flow rate controlled by the diaphragm valve corresponds to the controlled target value predetermined by the control part and the time value operating the diaphragm valve; and a step of stopping the operation of the diaphragm valve when the comparison result values of the measurement value and the target value compared by the control part correspond to each other, or operating the diaphragm valve until the measurement value and the target value correspond to each other when the comparison result values of the measurement value and the target value compared by the control part do not correspond to each other.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a flow rate of a liquid or a gas,

More particularly, the present invention relates to a method of controlling a flow rate of a liquid or a gas, and more particularly, to a method of controlling a flow rate of a liquid or gas by connecting a plurality of diaphragm valves for controlling a flow rate of a liquid or a gas, To a method of controlling the flow rate of a liquid or a gas so that the flow rate can be controlled and the pump can also be used in case of emergency.

Flow control valves, which generally control the flow rate, are operated through pressure differentials. Of the many flow valves operated by such pressure differentials, the following prior art publications: US Nos. 2, 980, 385; No. 3,493,008 of P. J. Scaglione; S. Perez (inventor) Patent Application US No. 08 / 545,890. U.S. Patent No. 2,980,385 to Hunter discloses a valve having a hemispherical, yieldable membrane, wherein the wall of the valve is relatively thick so that even if the pressure is significantly high in the recess of the valve, Is not locked in the flow outlet. On the other hand, the excessive wall thickness prevents the valve from reacting to minute pressure differences, so that the valve can be permanently closed or only a very small flow rate can be released without the required flow rate release at the minute opening of the valve have.

U.S. Patent No. 3,493,008 to Scaglione discloses a valve having a valve-active element composed of a disk cup and a metallic weld seamed, flexible bellow. Since the metallic flexible bellows wall is easily collapsed when the inner pressure is higher than the external pressure due to the pressure difference on both sides of the wall, the bellows design with a more resistant wall is required in high pressure operation, Is obtained.

On the other hand, the disk-shaped cup is basically rigid and this disk-shaped cup sealing device loses efficiency with the valve seat when the flow rate in the conduit carries impurities. In addition, a substantial loss of load due to the valve structure is created.

Most valves in the prior art, operated by pressure differentials, have a complicated structure with considerable load loss and are very inflexible with regard to hydraulic pressure in the conduit. In other words, these valves are designed to regulate flow within a smaller range of pressures, losing efficiency for significant pressure changes within the conduit.

U.S. Patent Application No. 08 / 545,890 to Perez discloses a differential type valve which is sensitive to minute pressure changes and which is resistant to significant operating pressures, which allows for a very simple design with few components. The differential valve shows a rigid valve body having an opening for the flow inlet and a flow outlet which is located in an approximately intersecting manner with respect to the inlet opening. The valve body has a main cavity between the flow inlet and the outlet and a valve seat at the boundary of the main cavity and the flow inlet. The valve body is also provided with a control flow outlet conduit connected to the control flow transfer means of the valve. The valve has an elastomeric body located inside the main cavity of the valve, said elastomer being hollow and having one of its axial ends open and a central opening provided at the other end.

The central opening transfers the control flow inlet to the cavity, which is of the same nature as the flow rate of the network in which the valve is operating.

Although this last kind of valve is a useful and simple design, it is not possible to use a control flow that is different from the flow rate of the network, which is essential in automatic controls or in devices where a large amount of control flow must be controlled through fine signals . The present invention has several components disclosed in U.S. Patent Application No. 08 / 545,890, except that it has an inlet means for control flow which can be independent of the main flow of the network, Lt; RTI ID = 0.0 > valve < / RTI >

However, the above-mentioned configuration has a problem that the flow rate can not be changed because the hole located in the sealing wall of the elastomer of the valve has a constant cross-section, and even if the flow rate can be changed, it is difficult to control the minute flow rate.

In the present invention, a plurality of diaphragm valves for controlling the flow rate of a liquid or a gas are connected to form a single module, thereby controlling the flow rate of the liquid or gas, thereby controlling a minute flow rate. The flow rate of the liquid or gas is controlled.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems.

According to another aspect of the present invention, there is provided a method for controlling a flow rate of a liquid or a gas, comprising: forming a module by connecting one or more diaphragm valves in series, Connecting an inlet pipe and a discharge pipe through which liquid or gas flows to an inlet and a discharge port of the diaphragm valve and controlling a solenoid valve of the diaphragm valve by a control signal according to a target value and a time value set by the controller, Controlling a flow rate of a liquid or a gas flowing through the inlet port; controlling a flow rate of the liquid or gas controlled through the diaphragm valve to a controlled flow rate target value set in the controller and a time value for operating the diaphragm valve Or the flow rate between the diaphragm valve and the control unit Comparing the measurement value of the flow rate of the liquid or gas and the target value measured through the balance with the control unit; and comparing the measured value and the target value with each other, And operating the diaphragm valve until the measured value and the target value coincide with each other if the comparison result of the measured value and the target value compared by the control unit does not match each other.

Specifically, the diaphragm valve is formed of a metal material and can open / close the flow of a high temperature liquid or gas.

The diaphragm valves may be connected in series to each other to form a module, and other diaphragm valves may be coupled in parallel to the diaphragm valve composed of the modules.

The controller may control the flow rate target value and the time value inputted through an external input device to pump the liquid or gas into which the diaphragm valve is introduced to operate the diaphragm valve as a pump.

As described above, according to the present invention, a plurality of diaphragm valves are combined to form a module, and then the flow rate of the liquid or gas to be controlled is controlled by controlling the flow rate of the diaphragm valve. Therefore, a small amount of flow rate can be controlled, The diaphragm valve can be connected in parallel to control the flow rate of the large capacity.

1 is a flowchart showing a method of controlling a flow rate of a liquid or a gas according to an embodiment of the present invention.
2 is a configuration diagram of a flow rate control method of a liquid or a gas according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference symbols whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 shows a method of controlling the flow rate of a liquid or gas according to an embodiment of the present invention, in which one or more diaphragm valves 10 capable of flowing a high temperature liquid or gas and capable of sterilizing are connected in series to form a module Connecting an inlet pipe and a discharge pipe into which the liquid or gas flows into the inlet port 11 and the outlet port 12 of the diaphragm valve 10 and connecting the inlet pipe and the outlet pipe to each other through a liquid value or a time value, Controlling the flow rate of the gas, measuring the flow rate of the liquid or gas to be flowed and comparing the flow rate to a set target value, and maintaining or stopping the operation of the solenoid valve through the compared value.

As shown in FIG. 2, the diaphragm valve 10 may be a commercially available diaphragm valve 10, and may include one or more diaphragm valves 10 connected in series, ) Is connected to at least one solenoid valve to form one module.

When the diaphragm valve 10 is connected to the diaphragm valve 10 in a module form, an inlet pipe for injecting liquid or gas into the inlet 11 and the outlet 12 of the diaphragm valve 10, And the discharge pipe for discharging is connected.

A control unit 20 is connected to the solenoid valve of the diaphragm valve 10 and a flow meter or balance is connected between the control unit 20 and the discharge port 12 of the diaphragm valve 10.

In the step of controlling the flow rate of the liquid or gas, when the diaphragm valve 10 is installed in a facility for controlling the flow rate through the step of connecting the inlet pipe and the discharge pipe with the diaphragm valve 10 as a module, The target value of the target flow rate and the time value for controlling the operation time of the diaphragm valve 10 in order to achieve the target value are transmitted to the control unit 20 through the external input device connected to the control unit 20 ).

The control unit 20 operates the solenoid valve to operate the diaphragm valve 10 based on the target value and the time value set in the controller 20.

When the diaphragm valve 10 is operated, the flow rate of the fluid flowing through the flow meter or the balance connected between the control unit 20 and the discharge port 12 of the diaphragm valve 10 is measured through the step of controlling the flow rate of the liquid or gas, And the control unit 20 compares the measured flow rate measured value with the target value set in the controller 20.

The control unit 20 transmits the control signal to the solenoid valve of the diaphragm valve 10 and controls the diaphragm valve 10 to be controlled by the diaphragm valve 10 with the flow rate value thus compared in the control unit 20 When the result of the comparison reaches the target value, the operation of the diaphragm valve 10 is stopped to block the flow of the liquid or gas.

On the contrary, if the comparison result obtained by comparing the measured value and the target value compared by the controller 20 does not match, the diaphragm valve 10 is controlled until the measured value matches the target value.

Hereinafter, a method of operating the present invention will be described with reference to an embodiment.

A solenoid valve connected to each diaphragm valve 10 of the module in which one or more diaphragm valves 10 are coupled in series is controlled by the control unit 20 so that the diaphragm valve 10 at the front end is opened and connected to the inlet 11 The diaphragm valve 10 of the next stage is opened by the operation of the solenoid valve so that the liquid or gas introduced through the inlet port 11 is introduced.

Thereafter, the diaphragm valve 10 of the first stage is shut off, the last diaphragm valve 10 connected to the next stage of the middle stage is opened, and then the diaphragm valve 10 of the middle stage is shut off, So that the liquid or gas introduced into the first chamber 10 is discharged to the last stage.

By controlling the opening time of each end of the diaphragm valve 10 controlled in this manner, a small amount of flow rate can be controlled.

If the flow rate is controlled by connecting the diaphragm valve 10 to the same module or each end in parallel to the diaphragm valve 10 constituted by the module individually, the flow rate of the liquid or gas can be controlled with a more organic and smooth flow Also, it is possible to control a large amount of flow rate.

The present invention configured as described above controls a flow rate of a liquid or gas flowing by controlling a flow of the diaphragm valve by combining a plurality of diaphragm valves and controlling the flow rate. Therefore, it is possible to control a small amount of flow rate and use a diaphragm valve as a pump, There is an advantage that a large-capacity flow rate can be controlled by connecting a diaphragm valve.

The method of controlling the flow rate of the liquid or gas is not limited to the configuration and the operation of the embodiments described above. The embodiments may be configured so that all or some of the embodiments may be selectively combined so that various modifications may be made.

10: diaphragm valve 11: inlet
12:
20:

Claims (4)

Wherein the diaphragm valve comprises at least one diaphragm valve connected in series to at least one of the inlet and outlet of the at least one diaphragm valve in series, Connecting the tubes;
Controlling a flow rate of the liquid or gas flowing through the inlet by controlling the solenoid valve of the diaphragm valve through a control signal according to a target value and a time value set by the controller;
The flow rate of the liquid or gas controlled through the diaphragm valve is measured through a flowmeter or a balance connected between the diaphragm valve and the control unit so that the flow rate of the liquid or gas controlled by the diaphragm valve coincides with the controlled flow rate target value set in the control unit and the time value for operating the diaphragm valve Comparing the flow measurement value and the target value of the liquid or gas at the control unit; And
And stopping the operation of the diaphragm valve when the comparison result of the comparison between the measured value and the target value is equal to the comparison result in the control unit and when the comparison result of the comparison between the measured value and the target value, And operating the diaphragm valve until the value and the target value coincide with each other.
The method according to claim 1,
Wherein the diaphragm valve is formed of a metal and is capable of opening and closing a flow of a high temperature liquid or gas.
The method according to claim 1,
Wherein the diaphragm valves are connected in series to each other to form a module, and the diaphragm valves are coupled in parallel to the diaphragm valve composed of the modules.
The method according to claim 1,
Wherein the control unit controls the flow rate target value and the time value input through an external input device to pump the liquid or gas into which the diaphragm valve is introduced to operate the diaphragm valve as a pump.

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