CN115454159A - A gas output device - Google Patents

Abstract

The invention provides a gas output device, comprising: a controller, a pressure regulation circuit electrically connected with the controller, a voltage stabilizing device, a gas output circuit, and a key module; the input end of the pressure regulation circuit is used for Connect the gas source, the output end of the pressure regulating circuit is connected to the input end of the pressure stabilizing device, the output end of the voltage stabilizing device is used to connect the experimental device, which solves the problem that the gas flow controller cannot maintain a constant pressure output, and Continuous constant current output cannot be performed.

Description

A gas output device

technical field

The invention relates to the field of automatic control, in particular to a gas output device.

Background technique

In laboratory scientific research experiments and actual industrial production, it is necessary to accurately control the flow (constant flow) output or control the pressure (constant pressure) output of gas for a long time without interruption. At present, the existing technology mainly uses a high-precision ISCO pump to control the output of the gas at a constant flow or constant pressure, and also uses a gas flow controller to output the gas at a constant flow.

However, although ISCO pumps are used for injection rate and pressure control, although the accuracy is high, ISCO pumps are expensive. The price of ISCO pumps is between 200,000 and 500,000 depending on the model. The use of gas flow controllers can achieve precise control of gas flow. However, the constant voltage output mode cannot be performed, and the function is single. In addition, there is another big disadvantage of the gas flow controller. When the pressure at the output end of the gas flow controller rises, causing the pressure difference on both sides of the gas flow meter to be lower than its working pressure difference, it will not work.

In view of this, propose this application.

Contents of the invention

The invention discloses a gas output device, aiming at solving the problem that a gas flow controller cannot maintain a constant pressure output and cannot intelligently adjust the pressure difference at both ends of the gas flow controller to achieve continuous constant current output.

An embodiment of the present invention provides a gas output device, including: a controller, a pressure regulating circuit electrically connected to the controller, a voltage stabilizing device, a gas output circuit, and a key module;

The input end of the pressure regulating circuit is used to connect to the gas source, the output end of the pressure regulating circuit is connected to the input end of the voltage stabilizing device, and the output end of the voltage stabilizing device is used to connect to the experimental device;

Wherein, the controller is configured to implement the following steps by executing its internally stored computer program:

Obtain the key signal of the key module;

When it is determined that the device is in a constant pressure output state according to the button signal, the gas output circuit is controlled to open the first path, so that the output end of the voltage stabilizing device communicates with the experimental device;

Obtain the pressure value of the pressure stabilizing device in real time, and when the pressure value is lower than the preset value, open the pressure regulating circuit to supplement the pressure stabilizing device, so that a constant pressure is output to the realization device air flow;

When it is determined that the device is in a constant current output state according to the button signal, the gas output circuit is controlled to open the second passage, so that the output end of the voltage stabilizing device passes through the mass flow meter arranged on the second passage communicate with the experimental device;

The differential pressure value at both ends of the mass flowmeter is obtained in real time, and the regulating loop is dynamically opened and closed according to the differential pressure value, so that the airflow with a constant flow rate is output to the realization device.

Preferably, the pressure regulating circuit includes: a first three-way solenoid valve, a gas compressor, and a first solenoid valve;

The first end of the first three-way electromagnetic valve is connected to the air source, the second end of the first three-way electromagnetic valve is connected to the input end of the first electromagnetic valve, and the first three-way electromagnetic valve The third end of the valve is connected to the input end of the gas compressor, the output end of the gas compressor is connected to the input end of the first electromagnetic valve, and the output end of the first electromagnetic valve is connected to the voltage stabilizing valve. the input connection of the device;

The control end of the first three-way electromagnetic valve, the control end of the gas compressor, and the control end of the first electromagnetic valve are electrically connected to the output end of the controller.

Preferably, the pressure stabilizing device includes: a pressure stabilizing container, a pressure gauge, and a second solenoid valve;

The input end of the pressure stabilizing container is connected to the output end of the first electromagnetic valve, the output end of the voltage stabilizing container is connected to the input end of the second electromagnetic valve, and the output end of the second electromagnetic valve is connected to the output end of the second electromagnetic valve. The input end of the gas output circuit is connected;

The pressure gauge is configured on the pressure-stabilizing container, and is used to collect the pressure value of the pressure-stabilizing container in real time;

The pressure gauge is electrically connected to the input end of the controller, and the control end of the second solenoid valve is electrically connected to the output end of the controller.

Preferably, the gas output circuit includes: a second three-way solenoid valve, a mass flow meter, and a differential pressure sensor;

The first end of the second three-way solenoid valve is connected to the output end of the second solenoid valve, and the second end of the second three-way solenoid valve is connected to the experimental device; The third end is connected to the input end of the mass flow meter, the output end of the mass flow meter is connected to the experimental device, and the differential pressure sensor is connected to the input end and the output end of the mass flow meter;

The control end of the second three-way solenoid valve is electrically connected to the output end of the controller, and the differential pressure sensor is electrically connected to the input end of the controller.

Preferably, the pressure regulating circuit is configured to turn on or off the gas compressor according to a key signal of the key module.

Preferably, the working pressure difference of the mass flowmeter is 0.2-0.8mpa.

Preferably, the controller is a PLC controller.

Preferably, the pressure difference value at both ends of the mass flowmeter is obtained in real time, and the adjustment loop is dynamically opened and closed according to the pressure difference value, so that the airflow with a constant flow rate is output to the realization device, specifically :

Obtaining the differential pressure value at both ends of the mass flow sensor through the differential pressure sensor, and judging whether the differential pressure value is less than a preset value;

If so, control the opening of the first electromagnetic valve to increase the pressure in the pressure-stabilizing container, and close the first electromagnetic valve when the pressure difference value is higher than the preset value.

Based on a gas output device provided by an embodiment of the present invention, the controller determines the working mode required by the experimental device by receiving the button signal of the button module, and controls the gas when it is judged that a constant pressure output is required. The output circuit opens the first passage, so that the output end of the voltage stabilizing device communicates with the experimental device, and obtains the pressure value of the voltage stabilizing device in real time, and when the pressure value is lower than the preset value, opens The pressure regulation circuit supplies air to the pressure stabilizing device, so that the airflow of constant pressure is output to the realization device;

When it is determined that a constant current output is required, the gas output circuit is controlled to open a second passage, so that the output end of the voltage stabilizing device communicates with the experimental device through a mass flow meter arranged on the second passage; Obtain the differential pressure value at both ends of the mass flowmeter in real time, and dynamically open and close the regulating loop according to the differential pressure value, so that the air flow with a constant flow rate is output to the realization device, which solves the problem that the gas flow controller cannot To maintain a constant voltage output, and unable to carry out continuous constant current output.

Description of drawings

Fig. 1 is a schematic diagram of a gas output device provided by the present invention;

Fig. 2 is a schematic diagram of the gas output device provided by the present invention in constant pressure mode.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is some embodiments of the present invention, but not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

The invention discloses a gas output device, which aims to solve the problem that a gas flow controller cannot maintain constant pressure output and cannot perform continuous constant current output.

Please refer to FIG. 1 , an embodiment of the present invention provides a gas output device, including: a controller 8, a pressure regulating circuit electrically connected to the controller 8, a voltage stabilizing device, a gas output circuit, and a key module;

The input end of the pressure regulating circuit is used to connect to the gas source 1, the output end of the pressure regulating circuit is connected to the input end of the pressure stabilizing device, and the output end of the pressure stabilizing device is used to connect to the experimental device 14;

It should be noted that, in this embodiment, the pressure regulating circuit is configured to be connected to a gas source 1, wherein the gas source 1 can be a high-pressure gas cylinder of different gas types or air, wherein the pressure regulating circuit can be increased The gas pressure input from the atmospheric source 1 can also directly lead the gas output from the gas source 1 to the rear end.

In a possible embodiment of the present invention, the pressure regulating circuit includes: a first three-way solenoid valve 2, a gas compressor 3, and a first solenoid valve 4; the first end of the first three-way solenoid valve 2 It is connected to the air source 1, the second end of the first three-way solenoid valve 2 is connected to the input end of the first solenoid valve 4, and the third end of the first three-way solenoid valve 2 is connected to the input end of the first three-way solenoid valve 2. The input end of the gas compressor 3 is connected, the output end of the gas compressor 3 is connected with the input end of the first electromagnetic valve 4, the output end of the first electromagnetic valve 4 is connected with the input end of the voltage stabilizing device Connection; the control end of the first three-way electromagnetic valve 2, the control end of the gas compressor 3, and the control end of the first electromagnetic valve 4 are electrically connected to the output end of the controller 8;

It should be noted that, in this embodiment, if the gas pressure value of the gas source 1 is low enough to meet the experimental requirements, it is necessary to turn on the gas compressor 3 to pressurize the gas and then lead to the subsequent circuit , specifically, the button module is configured with a first button 10, wherein the first button is used to switch the first three-way solenoid valve 2, so that the other part of the gas source 1 can pass through the gas first. The compressor 3 passes through the pressure stabilizing device. Of course, if the pressure of the gas source 1 meets the maximum pressure value required by the experiment, the gas compressor 3 is not passed through.

In this embodiment, the pressure stabilizing device is used to stabilize the gas output from the gas source 1, so as to avoid the huge pressure change caused by the gas from the gas source 1 entering the system, which will affect the experimental results of the experimental device 14.

In a possible embodiment of the present invention, the pressure stabilizing device includes: a pressure stabilizing container 6, a pressure gauge 5, and a second solenoid valve 7;

The input end of the pressure stabilizing container 6 is connected with the output end of the first electromagnetic valve 4, the output end of the voltage stabilizing container 6 is connected with the input end of the second electromagnetic valve 7, and the second electromagnetic valve The output end of 7 is connected with the input end of the gas output circuit;

The pressure gauge 5 is configured on the pressure-stabilizing container 6 for real-time collection of the pressure value of the pressure-stabilizing container 6; the pressure gauge 5 is electrically connected to the input end of the controller 8, and the second The control end of the solenoid valve 7 is electrically connected to the output end of the controller 8

It should be noted that the pressure-stabilizing container 6 is initially in an atmospheric pressure state, and the pressure gauge 5 is used to monitor the pressure in the pressure-stabilizing container 6. Through the control, the first electromagnetic valve 4 is first opened, and the second electromagnetic valve 7 is closed, the gas output from the gas source 1 continuously enters the pressure-stabilizing container 6, and when the pressure in the pressure-stabilizing container 6 reaches the working pressure required by the equipment, the first electromagnetic valve 4 is closed, and the second electromagnetic valve 7 is opened, and the gas proceeds The output of the next module, along with the continuous output of the gas in the pressure-stabilizing container 6, the pressure of the pressure-stabilizing container 6 drops, and when the pressure is lower than the set range, the first solenoid valve is controlled by the controller 8 to open 4 Intake, increase to the set pressure and close again, so that the pressure in the pressure stabilizing container 6 is dynamically balanced

In this embodiment, the gas output circuit is used to switch the path of the gas output circuit according to the gas output state required by the experimental device 14 .

In a possible embodiment of the present invention, the gas output circuit may include: a second three-way solenoid valve 9, a mass flow meter 13, and a differential pressure sensor 12;

The first end of the second three-way solenoid valve 9 is connected to the output end of the second solenoid valve 7, and the second end of the second three-way solenoid valve 9 is connected to the experimental device 14; The third end of the solenoid valve 9 is connected to the input end of the mass flow meter 13, the output end of the mass flow meter 13 is connected to the experimental device 14, and the differential pressure sensor 12 is connected to the mass flow meter 13. On the input end and the output end; the control end of the second three-way solenoid valve 9 is electrically connected to the output end of the controller 8 , and the differential pressure sensor 12 is electrically connected to the input end of the controller 8 .

It should be noted that the second end of the second three-way electromagnetic valve 9 and the interface of the experimental device 14 form a second passage, the third end of the second three-way electromagnetic valve 9, the mass flow meter 13, and The interface of the experimental device 14 forms a second passage; specifically, the experimental device 14 connected after the mass flowmeter 13 monitors and adjusts the pressure of the pressure-stabilizing vessel 6 in real time through the controller 8 under the condition of pressure changes to ensure that the mass flowmeter The working pressure difference on both sides of 13 is kept constant (usually 0.3-0.6MPA), so as to maintain the normal operation of mass flow meter 13 . When the pressure at the rear end of the mass flowmeter 13 is constantly increasing, and the differential pressure of the mass flowmeter 13 is monitored by the differential pressure gauge to be lower than the preset differential pressure, the controller 8 monitors and controls to open the first solenoid valve in real time 4. Increase the pressure in the pressure stabilizing container 6, and close the first electromagnetic valve 4 after the differential pressure value at both ends of the mass flow meter 13 returns to the preset pressure difference requirement range of the mass flow meter 13, thereby A dynamic control is performed to ensure that the flow rate of the flow controller 8 is stable and works normally.

It should be noted that gas flowmeters of different brands have different working pressure ranges. In this embodiment, Qixing Huachuang D07-11C mass flowmeter 13 can be used. The working pressure difference range at the end is required to be 0.2-0.8mpa, and the pressure difference at both ends of the instrument can always be kept within the required range through the adjustment of the pressure regulating circuit, the voltage stabilizing device and the controller 8, and the gas can be stably output at a constant flow to solve the problem. When the pressure of the gas outlet end of the gas flow controller 8 rises, causing the pressure difference on both sides of the gas flow meter to be lower than its working pressure difference, it will not work. In other embodiments, it may also be a mass flow meter 13 with other working pressure differential ranges, which are not specifically limited here, but these solutions are all within the protection scope of the present invention.

When constant-pressure gas output is required in laboratory scientific research experiments and actual industrial production, the second three-way solenoid valve 9 can be adjusted by pressing the second button 11 to switch modes so that the gas switching channel can be directly passed in (that is, the second three-way The second end of the solenoid valve 9 is connected to the experimental device 14) The experimental device 14 is used for gas input under stable pressure conditions. After the gas in the pressure stabilizing vessel 6 continuously flows out into the experimental device 14, the pressure in the stabilizing vessel 6 will drop, and the controller 8 dynamically monitors the pressure approach in the stabilizing vessel 6 through the pressure gauge 5 , when it is detected that it is lower than the set value, the first electromagnetic valve 4 is controlled to open to replenish air, so that the pressure of the pressure-stabilizing container 6 is kept in a stable state at all times, ensuring a constant pressure output.

In a possible embodiment of the present invention, the controller 8 may be a PLC controller 8 .

It should be noted that in an industrial environment, the PLC controller 8 has a strong anti-interference ability and will not be disturbed by a noisy industrial environment. Of course, in other embodiments, a single-chip microcomputer can also be used for control, which is not mentioned here. Make specific limitations, but these schemes are all within the protection scope of the present invention.

Compared with the methods of the prior art, this embodiment has at least one of the following advantages: this embodiment designs a method for controlling the output of gas in constant flow or constant pressure mode through the combination of PLC, differential pressure gauge and flow controller, which can Realize wide pressure range, large flow range and constant flow or constant pressure mode output of different gas types under low cost conditions. At the same time, it has higher cost performance than that of the prior art while realizing functions. Cost estimation of the constant current experimental system built by this system with Qixing D07-11C mass flowmeter 13 with a flow range of 0-5SCCM and a pressure resistance of 10MPA.

Wherein, the controller 8 is configured to implement the following steps by executing its internally stored computer program:

S101, acquiring a key signal of the key module;

S102, when it is determined that the device is in a constant pressure output state according to the button signal, control the gas output circuit to open the first path, so that the output end of the voltage stabilizing device communicates with the experimental device 14, as shown in Figure 2 shown;

S103, obtain the pressure value of the pressure stabilizing device in real time, and when the pressure value is lower than the preset value, open the pressure regulating circuit to supplement the pressure stabilizing device, so that the output to the realization device constant pressure air flow;

S104. When it is determined according to the button signal that the device is in a constant current output state, control the gas output circuit to open the second path, so that the output end of the voltage stabilizing device passes through the mass The flow meter 13 communicates with the experimental device 14;

S105, acquire the differential pressure value at both ends of the mass flow meter 13 in real time, and dynamically open and close the regulating loop according to the differential pressure value, so that the airflow with a constant flow rate is output to the realization device. specifically:

Acquiring the differential pressure value at both ends of the mass flow sensor through the differential pressure sensor 12, and judging whether the differential pressure value is less than a preset value;

If so, control the opening of the first electromagnetic valve 4 to increase the pressure in the pressure-stabilizing container 6 , and close the first electromagnetic valve 4 when the differential pressure value is higher than the preset value.

Based on a gas output device provided by the embodiment of the present invention, the controller 8 determines the working mode required by the experimental device 14 by receiving the key signal of the key module, and controls the The gas output circuit opens the first passage, so that the output end of the pressure stabilizing device communicates with the experimental device 14, and obtains the pressure value of the stabilizing device in real time, and when the pressure value is lower than the preset value , open the pressure regulating circuit to supply air to the pressure stabilizing device, so that the airflow of constant pressure is output to the realization device;

When it is judged that a constant current output is required, the gas output circuit is controlled to open the second passage, so that the output end of the voltage stabilizing device passes through the mass flow meter 13 arranged on the second passage and the experimental device 14 communication; real-time acquisition of the differential pressure value at both ends of the mass flowmeter 13, and according to the differential pressure value, dynamically open and close the adjustment loop, so that the airflow of the constant flow rate is output to the realization device, which solves the problem of gas flow rate The controller 8 cannot maintain a constant voltage output, and cannot perform continuous constant current output.

The above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention.

Claims (8)

1. A gas output device, characterized in that it comprises: a controller, and a pressure regulating circuit electrically connected to the controller, a voltage stabilizing device, a gas output circuit, and a button module; The input end of the pressure regulating circuit is used to connect to the gas source, the output end of the pressure regulating circuit is connected to the input end of the voltage stabilizing device, and the output end of the voltage stabilizing device is used to connect to the experimental device; Wherein, the controller is configured to implement the following steps by executing its internally stored computer program: Obtain the key signal of the key module; When it is determined that the device is in a constant pressure output state according to the button signal, the gas output circuit is controlled to open the first path, so that the output end of the voltage stabilizing device communicates with the experimental device; Obtain the pressure value of the pressure stabilizing device in real time, and when the pressure value is lower than the preset value, open the pressure regulating circuit to supplement the pressure stabilizing device, so that a constant pressure is output to the realization device air flow; When it is determined that the device is in a constant current output state according to the button signal, the gas output circuit is controlled to open the second passage, so that the output end of the voltage stabilizing device passes through the mass flow meter arranged on the second passage communicate with the experimental device; The differential pressure value at both ends of the mass flowmeter is obtained in real time, and the regulating loop is dynamically opened and closed according to the differential pressure value, so that the airflow with a constant flow rate is output to the realization device. 2. A gas output device according to claim 1, wherein the pressure regulating circuit comprises: a first three-way solenoid valve, a gas compressor, and a first solenoid valve; The first end of the first three-way electromagnetic valve is connected to the air source, the second end of the first three-way electromagnetic valve is connected to the input end of the first electromagnetic valve, and the first three-way electromagnetic valve The third end of the valve is connected to the input end of the gas compressor, the output end of the gas compressor is connected to the input end of the first electromagnetic valve, and the output end of the first electromagnetic valve is connected to the voltage stabilizing valve. the input connection of the device; The control end of the first three-way electromagnetic valve, the control end of the gas compressor, and the control end of the first electromagnetic valve are electrically connected to the output end of the controller. 3. A gas output device according to claim 2, characterized in that the pressure stabilizing device comprises: a stabilizing vessel, a pressure gauge, and a second solenoid valve; The input end of the pressure stabilizing container is connected to the output end of the first electromagnetic valve, the output end of the voltage stabilizing container is connected to the input end of the second electromagnetic valve, and the output end of the second electromagnetic valve is connected to the output end of the second electromagnetic valve. The input end of the gas output circuit is connected; The pressure gauge is configured on the pressure-stabilizing container, and is used to collect the pressure value of the pressure-stabilizing container in real time; The pressure gauge is electrically connected to the input end of the controller, and the control end of the second solenoid valve is electrically connected to the output end of the controller. 4. A gas output device according to claim 3, wherein the gas output circuit comprises: a second three-way solenoid valve, a mass flow meter, and a differential pressure sensor; The first end of the second three-way solenoid valve is connected to the output end of the second solenoid valve, and the second end of the second three-way solenoid valve is connected to the experimental device; The third end is connected to the input end of the mass flow meter, the output end of the mass flow meter is connected to the experimental device, and the differential pressure sensor is connected to the input end and the output end of the mass flow meter; The control end of the second three-way solenoid valve is electrically connected to the output end of the controller, and the differential pressure sensor is electrically connected to the input end of the controller. 5 . The gas output device according to claim 2 , wherein the pressure regulating circuit is configured to turn on or off the gas compressor according to a key signal of the key module. 6. A gas output device according to claim 4, characterized in that the working pressure difference of the mass flowmeter is 0.2-0.8mpa. 7. A gas output device according to claim 1, characterized in that the controller is a PLC controller. 8. A gas output device according to claim 4, characterized in that the real-time acquisition of the differential pressure value at both ends of the mass flowmeter, and dynamically opening and closing the regulating loop according to the differential pressure value , so that the airflow of the constant flow rate is output to the realization device, specifically: Obtaining the differential pressure value at both ends of the mass flow sensor through the differential pressure sensor, and judging whether the differential pressure value is less than a preset value; If so, control the opening of the first electromagnetic valve to increase the pressure in the pressure stabilizing container, and close the first electromagnetic valve when the pressure difference value is higher than the preset value.

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