A gas output device

Abstract

The application provides a gas output device, comprising a controller, a pressure regulating circuit, a pressure stabilizing device, a gas output circuit and a button module which are electrically connected with the controller; an input end of the pressure regulating circuit is used for connecting a gas source; an output end of the pressure regulating circuit is connected with an input end of the pressure stabilizing device; and an output end of the pressure stabilizing device is used for connecting an experimental device, so that the problem that a gas flow controller cannot keep constant pressure output and cannot continuously output constant current is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automation control, in particular to a gas output device. BACKGROUND

[0002] In laboratory research experiments and actual industrial production, it is necessary to accurately control the flow (constant flow) or pressure (constant pressure) of gas output for a long time. At present, the existing technology mainly uses high-precision ISCO pump to control the constant flow or constant pressure of gas output, and there are also gas flow controllers for constant flow output of gas.

[0003] However, although the ISCO pump can control the injection rate and pressure with high precision, the ISCO pump is expensive, and the price of different models is between 200,000 and 500,000 yuan. The gas flow controller can accurately control the flow of gas, but it cannot perform constant pressure output mode and has single function. In addition, the gas flow controller has a big disadvantage that when the pressure at the output end of the gas flow controller rises, the pressure difference on both sides of the gas flow meter is lower than the working pressure difference, and the gas flow controller cannot work.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The present application discloses a gas output device, which aims to solve the problems that the gas flow controller cannot maintain constant pressure output and cannot intelligently adjust the pressure difference between the two ends of the gas flow controller for constant flow output.

[0006] The present application provides a gas output device, which comprises a controller, a pressure regulating circuit, a pressure stabilizing device, a gas output circuit and a key module electrically connected to the controller.

[0007] The input end of the pressure regulating circuit is connected to a gas source, 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 connected to an experimental device.

[0008] The controller is configured to execute the computer program stored therein to realize the following steps.

[0009] The key signal of the key module is obtained.

[0010] When it is judged according to the key signal that the device is in a constant pressure output state, the first path of the gas output circuit is opened to make the output end of the pressure stabilizing device communicate with the experimental device.

[0011] Real-time acquisition of the pressure value of the pressure stabilizing device, and when the pressure value is lower than the preset value, the pressure regulating circuit is opened to supply air to the pressure stabilizing device, so as to output a constant pressure gas flow to the experimental device;

[0012] When it is determined according to the key signal that the device is in a constant current output state, the second passage of the gas output circuit is opened, so that the output end of the pressure stabilizing device is communicated with the experimental device through the mass flow meter arranged on the second passage;

[0013] Real-time acquisition of the pressure difference value between the two ends of the mass flow meter, and dynamic opening and closing of the regulating circuit according to the pressure difference value, so as to output a constant flow gas flow to the experimental device.

[0014] Preferably, the pressure regulating circuit comprises a first three-way electromagnetic valve, a gas compressor, and a first electromagnetic valve.

[0015] The first end of the first three-way electromagnetic valve is connected with the gas source, the second end of the first three-way electromagnetic valve is connected with the input end of the first electromagnetic valve, the third end of the first three-way electromagnetic valve is connected with the input end of the gas compressor, the output end of the gas compressor is connected with the input end of the first electromagnetic valve, and the output end of the first electromagnetic valve is connected with the input end of the pressure stabilizing device.

[0016] 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 with the output end of the controller.

[0017] Preferably, the pressure stabilizing device comprises a pressure stabilizing container, a pressure gauge, and a second electromagnetic valve.

[0018] The input end of the pressure stabilizing container is connected with the output end of the first electromagnetic valve, the output end of the pressure stabilizing container is connected with the input end of the second electromagnetic valve, and the output end of the second electromagnetic valve is connected with the input end of the gas output circuit.

[0019] The pressure gauge is arranged on the pressure stabilizing container and is used for real-time acquisition of the pressure value of the pressure stabilizing container.

[0020] The pressure gauge is electrically connected with the input end of the controller, and the control end of the second electromagnetic valve is electrically connected with the output end of the controller.

[0021] Preferably, the gas output circuit comprises a second three-way electromagnetic valve, a mass flow meter, and a pressure difference sensor.

[0022] The first end of the second three-way electromagnetic valve is connected with the output end of the second electromagnetic valve, the second end of the second three-way electromagnetic valve is connected with the experimental device, the third end of the second three-way electromagnetic valve is connected with the input end of the mass flow meter, the output end of the mass flow meter is connected with the experimental device, and the differential pressure sensor is arranged on the input end and the output end of the mass flow meter.

[0023] The control end of the second three-way electromagnetic valve is electrically connected with the output end of the controller, and the differential pressure sensor is electrically connected with the input end of the controller.

[0024] Preferably, the pressure regulating circuit is configured to start or stop the gas compressor according to the key signal of the key module.

[0025] Preferably, the working differential pressure of the mass flow meter is 0.2-0.8mpa.

[0026] Preferably, the controller is a PLC controller.

[0027] Preferably, the differential pressure value between the two ends of the mass flow meter is acquired in real time, and the regulating circuit is dynamically started and stopped according to the differential pressure value, so that a constant flow of gas is output to the implementation device, specifically:

[0028] The differential pressure value between the two ends of the mass flow sensor is acquired by the differential pressure sensor, and it is judged whether the differential pressure value is less than a preset value.

[0029] If yes, the first electromagnetic valve is controlled to be started to increase the pressure in the pressure stabilizing container, and when the differential pressure value is higher than the preset value, the first electromagnetic valve is controlled to be stopped.

[0030] Based on the gas output device provided by the embodiment of the application, the controller determines the working mode required by the experimental device by receiving the key signal of the key module, controls the gas output circuit to start the first path when it is judged that constant pressure output is required, so that the output end of the pressure stabilizing device is communicated with the experimental device, the pressure value of the pressure stabilizing device is acquired in real time, and the pressure regulating circuit is started to supplement gas to the pressure stabilizing device when the pressure value is lower than the preset value, so that a constant pressure of gas is output to the implementation device.

[0031] When it is judged that constant current output is needed, the gas output circuit is controlled to open the second passage, so that the output end of the pressure stabilizing device is communicated with the experimental device through the mass flow meter arranged on the second passage; the differential pressure value between the two ends of the mass flow meter is acquired in real time, and the adjusting circuit is dynamically opened and closed according to the differential pressure value, so that the gas flow with constant flow output by the experimental device is solved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the gas output device provided by the present application;

[0033] Figure 2 is a schematic diagram of the gas output device provided by the present application in constant pressure mode. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0035] The specific embodiments of the present application will be described in detail below with reference to the drawings.

[0036] The present application discloses a gas output device, which aims to solve the problems that a gas flow controller cannot maintain constant pressure output and cannot perform continuous constant current output.

[0037] Please refer to Figure 1 The present application provides a gas output device, which comprises a controller 8, and a pressure adjusting circuit, a pressure stabilizing device, a gas output circuit and a key module electrically connected with the controller 8.

[0038] The input end of the pressure adjusting circuit is used for connecting a gas source 1, the output end of the pressure adjusting circuit is connected with the input end of the pressure stabilizing device, and the output end of the pressure stabilizing device is used for connecting an experimental device 14.

[0039] It should be noted that in the embodiment, the pressure regulating circuit is configured to be connected to the gas source 1, wherein the gas source 1 can be a high-pressure gas cylinder of different gas types or air, and the pressure regulating circuit can increase the gas pressure input by the gas source 1 or directly guide the gas output by the gas source 1 to the rear end.

[0040] In a possible embodiment of the present application, the pressure regulating circuit comprises a first three-way electromagnetic valve 2, a gas compressor 3, and a first electromagnetic valve 4; the first end of the first three-way electromagnetic valve 2 is connected to the gas source 1, the second end of the first three-way electromagnetic valve 2 is connected to the input end of the first electromagnetic valve 4, the third end of the first three-way electromagnetic valve 2 is connected to the input end of the gas compressor 3, the output end of the gas compressor 3 is connected to the input end of the first electromagnetic valve 4, and the output end of the first electromagnetic valve 4 is connected to the input end of the pressure stabilizing device; 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.

[0041] It should be noted that in the embodiment, if the gas pressure value of the gas source 1 is low and cannot meet the experimental requirements, the gas compressor 3 needs to be turned on to pressurize the gas and then guide the gas to the rear circuit, specifically, the button module is provided with a first button 10, wherein the first button is used to switch the first three-way electromagnetic valve 2, so that the other gas of the gas source 1 can pass through the gas compressor 3 and then pass 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 does not pass through the gas compressor 3.

[0042] In the embodiment, the pressure stabilizing device is used to stabilize the gas output by the gas source 1, so as to avoid the pressure change caused by the gas of the gas source 1 entering the system, and affect the experimental results of the experimental device 14.

[0043] In a possible embodiment of the present application, the pressure stabilizing device comprises a pressure stabilizing container 6, a pressure gauge 5, and a second electromagnetic valve 7.

[0044] The input end of the pressure stabilizing container 6 is connected to the output end of the first electromagnetic valve 4, the output end of the pressure stabilizing container 6 is connected to the input end of the second electromagnetic valve 7, and the output end of the second electromagnetic valve 7 is connected to the input end of the gas output circuit.

[0045] The pressure gauge 5 is arranged on the pressure stabilizing container 6 and is used to collect the pressure value of the pressure stabilizing container 6 in real time; the pressure gauge 5 is electrically connected to the input end of the controller 8, and the control end of the second electromagnetic valve 7 is electrically connected to the output end of the controller 8.

[0046] It is to be noted that the pressure container 6 is initially in an atmospheric pressure state, the pressure gauge 5 is used to monitor the pressure in the pressure container 6, and the first electromagnetic valve 4 is first opened and the second electromagnetic valve 7 is closed by the control, the gas output by the gas source 1 continuously enters the pressure container 6, the first electromagnetic valve 4 is closed and the second electromagnetic valve 7 is opened when the pressure in the pressure container 6 reaches the required working pressure of the device, and the gas is output to the next module, and the pressure in the pressure container 6 decreases as the gas is continuously output, and the first electromagnetic valve 4 is opened to input gas by the controller 8 when the pressure is lower than the set range, and the first electromagnetic valve 4 is closed again after the pressure is increased to the set pressure, so that the pressure in the pressure container 6 is dynamically balanced.

[0047] In the embodiment, the gas output circuit is used to switch the passage of the gas output circuit according to the required gas output state of the experimental device 14.

[0048] In a possible embodiment of the application, the gas output circuit can include a second three-way electromagnetic valve 9, a mass flow meter 13, and a differential pressure sensor 12.

[0049] The first end of the second three-way electromagnetic valve 9 is connected with the output end of the second electromagnetic valve 7, the second end of the second three-way electromagnetic valve 9 is connected with the experimental device 14, the third end of the second three-way electromagnetic valve 9 is connected with the input end of the mass flow meter 13, the output end of the mass flow meter 13 is connected with the experimental device 14, the differential pressure sensor 12 is arranged on the input end and the output end of the mass flow meter 13, the control end of the second three-way electromagnetic valve 9 is electrically connected with the output end of the controller 8, and the differential pressure sensor 12 is electrically connected with the input end of the controller 8.

[0050] It is to 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, and the third end of the second three-way electromagnetic valve 9, the mass flow meter 13 and the interface of the experimental device 14 form a second passage; specifically, the experimental device 14 connected after the mass flow meter 13 is monitored and adjusted in real time by the controller 8 under the condition of pressure change, so that the working pressure difference on both sides of the mass flow meter 13 is kept constant (usually 0.3-0.6MPA), and the mass flow meter 13 is kept in normal working state. When the pressure at the rear end of the mass flow meter 13 continuously increases and the differential pressure of the mass flow meter 13 is lower than the preset differential pressure through the differential pressure gauge, the first electromagnetic valve 4 is opened in real time by the controller 8 to increase the pressure in the pressure container 6, and the first electromagnetic valve 4 is closed when the differential pressure value on both sides of the mass flow meter 13 returns to the preset differential pressure requirement range of the mass flow meter 13, so as to perform a dynamic control to ensure the stable working of the flow controller 8.

[0051] It should be noted that different brands of gas flow meters have different working pressure difference ranges, and in the present embodiment, a D07-11C mass flow meter 13 of Qixing Huachuang can be used, the flow range is 0-5 SCCM, the pressure resistance is 10 MPA, and the working pressure difference range of the instrument is required to be 0.2-0.8 MPA. The pressure adjusting circuit, the pressure stabilizing device, and the controller 8 can be adjusted to keep the pressure difference between the two ends of the instrument within the required range, and the gas can be stably and constantly output. When the outlet pressure of the gas flow controller 8 increases, the pressure difference between the two sides of the gas flow meter is lower than the working pressure difference, and the gas flow meter cannot work. In other embodiments, the mass flow meter 13 can also have other working pressure difference ranges, which are not limited here, but these solutions are within the protection scope of the present application.

[0052] When constant pressure gas output is required in laboratory scientific experiments and actual industrial production, the second button 11 can be pressed to switch the mode, the second three-way electromagnetic valve 9 is adjusted to make the gas switch channel directly enter (i.e., the second end of the second three-way electromagnetic valve 9 is connected with the experimental device 14) the experimental device 14 to input the gas under stable pressure condition. When the gas in the pressure stabilizing container 6 continuously flows out and enters the experimental device 14, the pressure in the pressure stabilizing container 6 will decrease. At this time, the controller 8 dynamically monitors the pressure in the pressure stabilizing container 6 through the pressure gauge 5. When the monitored pressure is lower than the set value, the first electromagnetic valve 4 is opened to supplement the gas, so that the pressure in the pressure stabilizing container 6 is kept stable at all times, and constant pressure output is ensured.

[0053] In a possible embodiment of the present application, the controller 8 can be a PLC controller 8.

[0054] It should be noted that in an industrial environment, the PLC controller 8 has strong anti-interference ability and will not be disturbed by the noisy industrial environment. Of course, in other embodiments, a single-chip microcomputer can also be used for control, which is not limited here, but these solutions are within the protection scope of the present application.

[0055] Compared with the prior art, the present embodiment has at least one of the following advantages: the present embodiment designs a method for controlling gas constant flow or constant pressure mode output by combining PLC, differential pressure gauge, and flow control instrument, which can realize constant flow or constant pressure mode output of wide pressure range, large flow range, and different gas types under the condition of low cost. At the same time, the present embodiment has higher cost performance than the prior art while realizing the function. The cost of the constant flow experimental system built by the D07-11C mass flow meter 13 of Qixing with a flow range of 0-5 SCCM and a pressure resistance of 10 MPA is estimated.

[0056] The controller 8 is configured to realize the following steps by executing the computer program stored therein.

[0057] S101, acquiring a key signal of the key module;

[0058] S102, when judging that the device is in a constant voltage output state according to the key signal, controlling the gas output circuit to open a first passage, so that the output end of the voltage stabilizing device is communicated with the experimental device 14, as shown in the figure; Figure 2

[0059] S103, acquiring a pressure value of the voltage stabilizing device in real time, and when the pressure value is lower than the preset value, opening the pressure regulating circuit to supplement gas for the voltage stabilizing device, so as to output a constant pressure gas flow to the experimental device;

[0060] S104, when judging that the device is in a constant current output state according to the key signal, controlling the gas output circuit to open a second passage, so that the output end of the voltage stabilizing device is communicated with the experimental device 14 through the mass flow meter 13 arranged on the second passage;

[0061] S105, acquiring a pressure difference value between the two ends of the mass flow meter 13 in real time, and dynamically opening and closing the regulating circuit according to the pressure difference value, so as to output a constant flow gas flow to the experimental device. Specifically:

[0062] acquiring the pressure difference value between the two ends of the mass flow sensor through the pressure difference sensor 12, and judging whether the pressure difference value is less than a preset value;

[0063] If yes, the first electromagnetic valve 4 is controlled to be opened to increase the pressure in the voltage stabilizing container 6, and when the pressure difference value is higher than the preset value, the first electromagnetic valve 4 is closed.

[0064] Based on the gas output device provided by the embodiment of the application, the controller 8 receives the key signal of the key module to determine the working mode required by the experimental device 14, controls the gas output circuit to open the first passage when judging that constant voltage output is required, so that the output end of the voltage stabilizing device is communicated with the experimental device 14, and acquires 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 regulating circuit to supplement gas for the voltage stabilizing device, so as to output a constant pressure gas flow to the experimental device;

[0065] ​When it is judged that constant current output is needed, the gas output circuit is controlled to open the second passage, so that the output end of the pressure stabilizing device communicates with the experimental device 14 through the mass flow meter 13 arranged on the second passage; the pressure difference between the two ends of the mass flow meter 13 is acquired in real time, and the adjusting circuit is dynamically opened and closed according to the pressure difference, so that the constant flow gas flow output by the experimental device solves the problems that the gas flow controller 8 cannot maintain constant pressure output and cannot perform continuous constant current output.

[0066] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiment. Any technical solution falling within the concept of the present application belongs to the protection scope of the present application.

Claims

1. A gas output device, characterized in that, include: The controller, and a pressure regulating circuit, a pressure stabilizing device, a gas output circuit, and a key module electrically connected to the controller; 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 pressure stabilizing device, and the output end of the pressure stabilizing device is used to connect to the experimental apparatus. 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 of the second three-way solenoid valve is connected to the input end of the mass flow meter, and the output end of the mass flow meter is connected to the experimental device; the differential pressure sensor is connected to both the input and output ends of the mass flow meter. The control terminal of the second three-way solenoid valve is electrically connected to the output terminal of the controller, and the differential pressure sensor is electrically connected to the input terminal of the controller; 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 solenoid valve is connected to the gas source, the second end of the first three-way solenoid valve is connected to the input end of the first solenoid valve, the third end of the first three-way solenoid 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 solenoid valve, and the output end of the first solenoid valve is connected to the input end of the pressure stabilizing device. The control terminals of the first three-way solenoid valve, the gas compressor, and the first solenoid valve are electrically connected to the output terminal of the controller. The controller is configured to perform the following steps by executing a computer program stored internally: Obtain the key signals from the key module; When the device is determined to be in a constant pressure output state based on the button signal, the first path of the gas output circuit is opened so that the output terminal of the pressure stabilizing device is connected to the experimental device. The pressure value of the pressure stabilizing device is acquired in real time, and when the pressure value is lower than the preset value, the pressure regulation circuit is activated to replenish the pressure stabilizing device, so as to output a constant pressure airflow to the experimental device. When the device is determined to be in constant current output state based on the button signal, the second channel of the gas output circuit is opened so that the output end of the pressure stabilizing device is connected to the experimental device through the mass flow meter configured on the second channel. The pressure difference across the mass flow meter is acquired in real time, and the regulating loop is dynamically opened and closed based on the pressure difference to ensure a constant flow rate of air is output to the experimental device. Specifically: The differential pressure sensor obtains the differential pressure value across the mass flow sensor and determines whether the differential pressure value is less than a preset value. If so, the first solenoid valve is opened to increase the pressure inside the pressure stabilizing container, and the first solenoid valve is closed when the pressure difference value is higher than the preset value.

2. The gas output device according to claim 1, characterized in that, 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 solenoid valve, the output end of the pressure stabilizing container is connected to the input end of the second solenoid valve, and the output end of the second solenoid valve is connected to the input end of the gas output circuit. The pressure gauge is mounted 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 terminal of the controller, and the control terminal of the second solenoid valve is electrically connected to the output terminal of the controller.

3. A gas output device according to claim 1, characterized in that, The pressure regulating circuit is configured to turn the gas compressor on or off according to the button signal from the button module.

4. A gas output device according to claim 1, characterized in that, The operating differential pressure of the mass flow meter is 0.2-0.8 MPa.

5. A gas output device according to claim 1, characterized in that, The controller is a PLC controller.

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