CN211148560U

CN211148560U - Portable oxyhydrogen calibrating device

Info

Publication number: CN211148560U
Application number: CN201921101798.3U
Authority: CN
Inventors: 邓维; 贾世奎; 高俊波; 李露; 王晓辰; 李臻; 陈博; 赵韦静; 成俊娜; 侯春彩
Original assignee: 718th Research Institute of CSIC
Current assignee: 718th Research Institute of CSIC
Priority date: 2019-07-15
Filing date: 2019-07-15
Publication date: 2020-07-31
Anticipated expiration: 2029-07-15

Abstract

The utility model provides a portable hydrogen and oxygen calibrating device, which comprises a carrier gas branch and an electrolytic gas branch which are mutually communicated; the electrolytic gas branch is provided with an electrolytic cell, a dryer, a gas chamber, a pressure sensor, a mass flow controller and a two-position three-way electromagnetic valve in sequence, the mass flow controller is connected with one input port of the two-position three-way electromagnetic valve, and a vacuum pump is arranged between the input port of the mass flow controller and the other input port of the two-position three-way electromagnetic valve. The utility model discloses can realize the gaseous preparation of hydrogen standard in oxygen/oxygen in the hydrogen of big concentration range, and adjust at any time and prepare at any time and use, the gaseous preparation concentration of standard is accurate, and the preparation method is convenient, portable.

Description

Portable oxyhydrogen calibrating device

Technical Field

The utility model relates to a portable oxyhydrogen calibrating device belongs to gaseous detection technical field.

Background

The existing standard gas of oxygen in hydrogen or hydrogen in oxygen for calibrating the detecting instrument is in the form of steel cylinder standard gas, and the standard gas below a certain concentration range can only be prepared due to technical limitation, thereby bringing great inconvenience to calibration work. The standard gas of steel bottle is carried inconveniently, uses loaded down with trivial details, if the standard gas of a plurality of concentrations of needs, need prepare a plurality of steel bottles just can cooperate and accomplish work, and the concentration that can formulate is restricted. The technical field of such portable oxygen in hydrogen/hydrogen in oxygen calibration devices is also open.

At present, both an online gas analyzer and a chromatographic analyzer need standard gas for calibration, and currently, a steel cylinder is widely used for preparing the standard gas for calibration, but due to technical limitation, only the standard gas in a certain concentration range can be prepared.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a portable oxyhydrogen calibrating device can realize the preparation of the gaseous standard of oxygen in the hydrogen/hydrogen in the oxygen of large concentration range, and adjusts at any time and prepares at any time and use, and the gaseous preparation concentration of standard is accurate, and the preparation method is convenient, portable.

Realize the technical scheme of the utility model as follows:

a portable hydrogen and oxygen calibration device comprises a carrier gas branch and an electrolytic gas branch which are communicated with each other;

the electrolytic gas branch is provided with an electrolytic cell, a dryer, a gas chamber, a pressure sensor, a mass flow controller and a two-position three-way electromagnetic valve in sequence, the mass flow controller is connected with one input port of the two-position three-way electromagnetic valve, and a vacuum pump is arranged between the input port of the mass flow controller and the other input port of the two-position three-way electromagnetic valve.

Advantageous effects

The utility model discloses in, the production process environmental protection of hydrogen oxygen, the ratio process is convenient rapid, and concentration adjustable range is big, and the standard gas accuracy of production is high, the process is stable.

The utility model discloses replaced the form of the steel bottle standard gas of production site in the past, adjusted at any time and prepared at any time and use, can provide the standard gas of multiple concentration demand for calibration work, easy operation, convenient and fast can be with solving among the prior art and prepare gas concentration singleness, can not prepare at any time, the portable problem not.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification;

FIG. 1 is an overall structure diagram of a portable hydrogen-oxygen calibration device of the present invention;

FIG. 2 is a circuit diagram of a constant current source of the portable hydrogen-oxygen calibrating device of the present invention;

FIG. 3 is a schematic diagram of a control portion of a portable hydrogen-oxygen calibration device of the present invention;

fig. 4 is a flow chart of the portable hydrogen and oxygen calibrating device of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.

The embodiment of the utility model provides a portable oxyhydrogen calibrating device, as shown in figure 1, including the gaseous preparation of standard of accomplishing of carrier gas branch road and electrolysis gas branch road two parts combined work of intercommunication each other.

A carrier gas storage and a mass flow controller are arranged on the carrier gas branch;

The electrolysis gas branch road in this embodiment adopts the SPE electrolysis trough to produce the mist of hydrogen and oxygen, gaseous output is decided by the operating current of electrolysis trough, therefore the electrolysis gas part is the flow that the SPE electrolysis trough produced gas by the current size control of adjustable constant current source, as shown in fig. 2, DA chip MCP 4821's output is adjustable analog quantity, the input of this output connection constant current source, the constant current source adopts fortune to put L M358D, according to the virtual short broken principle, thereby adjust the current of constant current source, in order to reduce fortune and put the error that itself brought, the utility model discloses in increased an fortune at the constant current source part and put AD623, carry out the difference with the current of constant current source and enlarge the error that appears in being used for the former circuit.

The embodiment of the utility model provides a carrier gas part is direct through a mass flow controller, and the flow size of output can be changed to the voltage of flow control end through control mass flow controller, and flow controller's control state divide into the valve accuse, closes, washs three state, can change flow controller's control state through the output voltage who changes the relay. Therefore, not only the flow rate of the gas flowing through the mass flow controller but also the flow state can be controlled.

The utility model discloses the mist that the electrolysis trough produced carries out dehydration through the desicator and gets into the air chamber, settles a pressure sensor in the electrolysis gas branch road and be arranged in monitoring branch road gaseous pressure, in case detect pressure and exceed and set for the threshold value, turns off the constant current source immediately, opens the air pump, takes out gas in the gas circuit, and when pressure drops below the threshold value, closes the air pump, opens the constant current source. The mass flow controller is controlled in part in the same manner as the carrier gas. And calculating the partial flow of the carrier gas and the partial flow of the electrolytic gas according to the set concentration and flow, and respectively controlling the flow of the mass flow controllers of the two branches according to the calculation result. Then controlling the output flow of the mixed gas through a mass flow controller (MFC 2); the output flow of the carrier gas is controlled by a mass flow controller (MFC1), and the output gas of the carrier gas part and the output gas of the electrolytic gas part are finally mixed and output to form the final output standard gas.

As shown in fig. 3, the control part of the device is realized by a hardware circuit board and an upper computer together, wherein the hardware circuit board is composed of a charging part, an MFC control part, a main control circuit board, keys and a screen, and STM32F103R8T6 is used as a core single chip microcomputer. The charging part comprises voltage conversion and charging of a power supply and provides required voltage for the main control board and the MFC control part. The main key part inputs required control information through the high-low level state combination of the keys. The main control circuit board generates an MFC control signal according to the control information input by the key part and outputs an AD signal (battery power, MFC flow, state of the solenoid valve and the vacuum pump). The upper computer finishes the processing of data signals by collecting the AD signals output by the main control circuit board, and designs a corresponding interface to be displayed by a screen.

The oxyhydrogen calibration process based on the portable oxyhydrogen calibration device is as follows:

as shown in fig. 4, starting to power up, closing two Mass Flow Controllers (MFCs), preheating for 15min, after preheating is completed, detecting a pressure value in a connecting gas path between the gas chamber and the mass flow controllers in real time by a pressure sensor, judging whether residual gas exists in the gas path, immediately opening a vacuum pump to perform vacuum pumping treatment if the pressure value in the gas path is not in a vacuum state, and closing the vacuum pump until the pressure state in the gas path is vacuum. And respectively calculating the flow of the carrier gas and the flow of the electrolytic gas according to the flow and the concentration of the required standard gas, and setting a mass flow controller. If the concentration is set to be zero, the needed zero gas can be obtained only by opening the MFC1 of the carrier gas branch, if the concentration is not set to be zero, whether the pressure in the gas path is within a threshold range is checked, when the pressure in the gas path exceeds the threshold value, the pressure in the pipeline is too high, damage can be caused to the branch, at the moment, the vacuum pump and the electromagnetic valve are opened for pressure relief, the electrolytic cell stops working, and the electrolytic cell continues to work until the pressure is restored to be within the threshold range, and the vacuum pump and the electromagnetic valve are closed. And when the flow rate is within the threshold range, the vacuum pump and the electromagnetic valve are closed, the electrolytic cell normally works, the mass flow controller is in a valve control state according to the setting of the upper computer, the set flow rate value is output, and the working state is maintained for 2min, so that the standard gas with the required concentration can be obtained and used for calibrating equipment.

If different concentrations or different types of standard gases are needed, the concentration and the flow rate of the standard gases can be set in the interface through key operation, and the needed standard gases can be selected in the interface, such as: oxygen in hydrogen, hydrogen in oxygen, oxygen in air, hydrogen in air. After resetting, if the standard gas type needs to be changed, the corresponding carrier gas type also needs to be changed, for example: the carrier gas for hydrogen-oxygen is hydrogen and the carrier gas for hydrogen-oxygen is oxygen. If the standard gas is not required to be replaced, the standard gas with the set concentration can be obtained after waiting for 2min after resetting.

In summary, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A portable hydrogen and oxygen calibration device is characterized by comprising a carrier gas branch and an electrolytic gas branch which are communicated with each other;