Portable gas concentration in-situ calibration detection device

Abstract

The utility model relates to the technical field of gas concentration detection, and particularly discloses a portable gas concentration in-situ calibration detection device which comprises a fusiform cavity, the fusiform cavity comprises a main cavity and a conical cover, one end of the conical cover is in threaded connection with the main cavity, and the other end of the conical cover is in threaded connection with a Y-shaped pipe. The other end of the main cavity is in threaded connection with a connecting port, the other end of the connecting port is in threaded connection with a double-thread conversion connector, the connecting port is in threaded connection with a gas concentration sensor through the double-thread conversion connector, nitrogen or other gases are filled, and the fusiform cavity is cleaned, so that the sensor or an instrument is in a state that the reading is 0 scale; the fusiform cavity is filled with standard gas with set concentration, so that the fusiform cavity is completely filled with the standard gas with stable pressure and concentration, the accurate measured sensor and instrument can display the reading meeting the error requirement with the standard gas concentration, and the inaccurate reading of the measured sensor and instrument exceeds the required range; therefore, the purposes of calibration and detection are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas concentration detection technical field, concretely is portable gas concentration in situ calibration detection device. BACKGROUND

[0002] The gas concentration calibration detection device is a physical performance testing instrument integrating calibration and detection functions, mainly used for accurate measurement and calibration of specific gas concentration. Through the device, the accuracy and reliability of gas concentration measurement results can be ensured, providing scientific basis for decision-making and action in related fields, which plays an important role in environmental science, industrial safety, agriculture and other fields.

[0003] At present, the gas concentration calibration detection device is easily affected by the outside during use, which affects the calibration and detection of gas concentration, so it is necessary to provide a portable gas concentration in situ calibration detection device to solve the above problems. UTILITY MODEL CONTENT

[0004] The utility model aims at providing portable gas concentration in situ calibration detection device, which connects the measured instrument or sensor to the device, so that the measured instrument or sensor is placed inside a cavity full of gas, unaffected by the outside, thereby achieving the purpose of calibration and detection.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a portable gas concentration in situ calibration detection device, comprising a shuttle-shaped cavity, the shuttle-shaped cavity comprises a main cavity and a conical cover threadedly connected to one end of the main cavity, the other end of the conical cover is threadedly connected with a Y-shaped tube, the other end of the main cavity is threadedly connected with a connecting port, the other end of the connecting port is threadedly connected with a double-thread conversion joint, and the connecting port is threadedly connected with a gas concentration sensor through the double-thread conversion joint.

[0006] A pressure gauge and an exhaust valve are installed on the outer wall of the connecting port.

[0007] In order to fill the entire shuttle-shaped cavity with gas, as the portable gas concentration in situ calibration detection device of the utility model, the inside of the main cavity is threadedly connected with a shunt plate.

[0008] In order to control the standard gas for testing and calibration, 99.9% nitrogen gas is input into the shuttle-shaped cavity, as the portable gas concentration in situ calibration detection device of the utility model, the two connecting pipes on the Y-shaped tube are nitrogen inlet pipe and standard gas inlet pipe respectively, and the outer walls of the nitrogen inlet pipe and the standard gas inlet pipe are both provided with air valves.

[0009] In order to make the shuttle-shaped cavity form a shuttle-shaped structure, and facilitate complete filling of gas, as the portable gas concentration in-situ calibration detection device of the utility model preferably, the end of the main cavity away from the conical cover is conical.

[0010] In order to make the gas entering from the Y-shaped pipe form approximate laminar flow and facilitate filling of the entire shuttle-shaped cavity, as the portable gas concentration in-situ calibration detection device of the utility model preferably, the flow splitter plate is a grid plate structure or a laminar flow plate structure.

[0011] Compared with the prior art, the utility model has the beneficial effects as follows:

[0012] The utility model discloses first connect the measured instrument or sensor with the device, so that the measured instrument or sensor is placed in a cavity filled with gas, is not influenced by the outside world, thereby achieving the purpose of calibration and detection. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is the overall three-dimensional structure diagram of the utility model;

[0014] Fig. 2 It is the overall split structure diagram of the utility model;

[0015] Fig. 3 It is the overall split structure diagram of the utility model;

[0016] In the drawing: 1, shuttle-shaped cavity;101, conical cover;102, connecting port;103, flow splitter plate;104, main cavity;2, Y-shaped pipe;201, air valve;3, pressure gauge;4, exhaust valve;5, double-thread conversion joint;6, gas concentration sensor. DETAILED DESCRIPTION

[0017] Please refer to Figs. 1 to 3 The portable gas concentration in-situ calibration detection device includes a shuttle-shaped cavity 1, the shuttle-shaped cavity 1 includes a main cavity 104 and a conical cover 101 threadedly connected with one end of the main cavity 104, the other end of the conical cover 101 is threadedly connected with a Y-shaped pipe 2, the other end of the main cavity 104 is threadedly connected with a connecting port 102, the other end of the connecting port 102 is threadedly connected with a double-thread conversion joint 5, and the connecting port 102 is threadedly connected with a gas concentration sensor 6 through the double-thread conversion joint 5.

[0018] The outer wall of the connecting port 102 is provided with a pressure gauge 3 and an exhaust valve 4.

[0019] In the embodiment, the shuttle-shaped cavity 1 is formed by the main cavity 104 and the conical cover 101, the interior of the shuttle-shaped cavity 1 is completely smooth without steps, the shuttle-shaped structure is beneficial to the complete filling of the gas, and there is no part that cannot be reached by the gas, the concentration of the gas in the cavity is consistent with the concentration of the gas entering the Y-shaped pipe 2 (the Y-shaped pipe 2 can be a U-shaped pipe, or two pipes separately connected with the conical cover 101 and serving as a nitrogen gas inlet pipe and a standard gas inlet pipe), the opening of the connecting port 102 is large, the gas in the shuttle-shaped cavity 1 can be fully contacted with the probe of the gas concentration sensor 6 to be measured, the pressure gauge 3 can be used to monitor the pressure of the gas, and whether the pressure is in a stable state is observed to verify whether the gas fills the shuttle-shaped cavity 1, and the exhaust valve 4 is used to exhaust the gas in the shuttle-shaped cavity 1.

[0020] In the specific work, the device is connected with a measured instrument or sensor, the ventilation valve 201 on the nitrogen gas inlet pipe is opened to fill the shuttle-shaped cavity 1 with nitrogen gas, the shuttle-shaped cavity 1 is flushed, the gas concentration sensor 6 is in a state of reading 0 scale, and other gases in the shuttle-shaped cavity 1 are exhausted, then the ventilation valve 201 on the standard gas inlet pipe is opened after the shuttle-shaped cavity 1 is flushed for a period of time, the standard gas is filled into the shuttle-shaped cavity 1, the exhaust valve 4 on the shuttle-shaped cavity 1 is closed after the standard gas is filled for a period of time, the value of the pressure gauge 3 is stable, the shuttle-shaped cavity 1 is filled with the standard gas, at this time, the reading on the gas concentration sensor 6 can be observed to obtain the experimental result, the reading of the accurate measured sensor and instrument is consistent with the standard gas concentration within the error requirement, and the reading of the inaccurate measured sensor and instrument is beyond the required range, so that the calibration and detection purposes are achieved.

[0021] As a technical optimization scheme of the utility model, the interior of the shuttle-shaped cavity 1 is threadedly connected with the shunt plate 103.

[0022] In the embodiment, the gas entering from the Y-shaped pipe 2 can form approximate laminar flow through the shunt plate 103 to facilitate the filling of the entire shuttle-shaped cavity 1, and the shunt plate 103 can be installed in or removed from the interior of the shuttle-shaped cavity 1 according to actual use requirements.

[0023] As a technical optimization scheme of the utility model, the two connecting pipes on the Y-shaped pipe 2 are a nitrogen gas inlet pipe and a standard gas inlet pipe, and the outer walls of the nitrogen gas inlet pipe and the standard gas inlet pipe are both provided with the ventilation valve 201.

[0024] In the embodiment, the standard gas inlet pipe and the nitrogen gas inlet pipe can be respectively connected with the interfaces connected with high-pressure or low-pressure gas hoses, and are connected with the gas cylinders of the standard gas and the nitrogen gas through the gas hoses, and the ventilation valve 201 is used to control the input of the standard gas and the 99.9% nitrogen gas into the shuttle-shaped cavity 1 for testing and calibration.

[0025] As a technical optimization scheme of the utility model, the end of the shuttle-shaped cavity 1 far from the conical cover 101 is conical.

[0026] In this embodiment, the end of the shuttle-shaped cavity 1 far from the conical cover 101 is conical, so that the shuttle-shaped cavity 1 forms a shuttle-shaped structure, which is beneficial to complete filling of the gas.

[0027] As a technical optimization scheme of the utility model, the shunt plate 103 is a grid plate structure or a laminar flow plate structure.

[0028] In this embodiment, the shunt plate 103 is set to a grid plate structure or a laminar flow plate structure (not limited to a grid plate or a laminar flow plate structure, and different structures can be customized according to actual requirements), so that the gas entering from the Y-shaped pipe 2 forms approximate laminar flow and is beneficial to fill the entire shuttle-shaped cavity 1.

[0029] Working principle: first, the gas valve 201 on the nitrogen inlet pipe can be opened to fill nitrogen into the shuttle-shaped cavity 1, flush the shuttle-shaped cavity 1, and discharge other gases in the shuttle-shaped cavity 1; second, after the shuttle-shaped cavity 1 is flushed for a period of time, the gas valve 201 on the nitrogen inlet pipe is closed, the gas valve 201 on the outer wall of the standard gas inlet pipe is opened, and standard gas is filled into the shuttle-shaped cavity 1; after a period of time, the exhaust valve 4 on the shuttle-shaped cavity 1 is closed, and the value of the pressure gauge 3 is stable, indicating that the shuttle-shaped cavity 1 has been stably filled with standard gas; at this time, the reading on the gas concentration sensor 6 (the oxygen concentration sensor probe is generally M20 x 1.5) can be observed to obtain the experimental results; the accurate measured sensor and instrument will display a reading that meets the error requirement with the standard gas concentration, and the reading of the inaccurate measured sensor and instrument is beyond the required range, so as to achieve the purposes of calibration and detection.

[0030] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A portable gas concentration in-situ calibration detection device comprising a shuttle-shaped cavity (1), characterized in that: The shuttle-shaped cavity (1) comprises a main cavity (104) and a conical cover (101) threadedly connected with one end of the main cavity (104), the other end of the conical cover (101) is threadedly connected with a Y-shaped pipe (2), the other end of the main cavity (104) is threadedly connected with a connecting port (102), the other end of the connecting port (102) is threadedly connected with a double-thread conversion joint (5), and the connecting port (102) is threadedly connected with a gas concentration sensor (6) through the double-thread conversion joint (5). A pressure gauge (3) and an exhaust valve (4) are mounted on the outer wall of the connecting port (102).

2. The portable in-situ gas concentration calibration detection device according to claim 1, characterized in that: The inside of the main cavity (104) is threadedly connected with a shunt plate (103).

3. The portable in-situ gas concentration calibration detection device according to claim 1, characterized in that: Two connecting pipes on the Y-shaped pipe (2) are a nitrogen inlet pipe and a standard gas inlet pipe, and the outer walls of the nitrogen inlet pipe and the standard gas inlet pipe are both mounted with air valves (201).

4. The portable in situ gas concentration calibration detection device of claim 1, wherein: The end of the main cavity (104) away from the conical cover (101) is conical.

5. The portable in situ gas concentration calibration detection device of claim 2, wherein: The shunt plate (103) is a grid plate structure or a laminar flow plate structure.

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