Nitrogen purge device and method for using the nitrogen purge device

Abstract

The present invention provides a nitrogen purge device for purging the mirror surface of a spectrometer detector, the nitrogen purge device comprising a nitrogen bottle, an air inlet pipe connected to the nitrogen bottle, a one-inlet-two-outlet valve whose air inlet end is connected to the air inlet pipe, a purge air path connected to one air outlet end of the one-inlet-two-outlet valve, and a pressure-limiting check valve connected to the other air outlet end of the one-inlet-two-outlet valve, wherein the purge air path is arranged away from one end of the one-inlet-two-outlet valve toward the mirror surface of the spectrometer detector. The nitrogen purge device of the present invention can start the spectrometer detector after the air in the air inlet pipe is exhausted by arranging the one-inlet-two-outlet valve and the pressure-limiting check valve. The nitrogen purge device of the present invention can better protect the spectrometer detector, while saving the time of the staff and avoiding the waste of nitrogen.

Description

Technical Field

[0001] The invention relates to a nitrogen purge device and a method for using the nitrogen purge device. Background Art

[0002] Currently, the full-spectrum ICP spectrometers on the market that use CCD and CID as detectors need to purge the detector mirror with 99.999% nitrogen for more than one hour before measurement before the mirror can be cooled. Otherwise, the detector will be damaged due to condensation of residual water vapor on the mirror. Most of the spectrometers on the market are purged manually or use a purge delay after startup. The detector mirror is often damaged due to operator errors. At the same time, purging for one hour after startup and re-purging after changing the gas cylinder wastes the operator's time and energy. In addition, each time the purge is performed, the residual air in the original air pipe will be blown onto the mirror, which is also easy to damage the detector.

[0003] In view of this, it is necessary to improve the existing nitrogen purge device to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a nitrogen purge device to solve the problem that the existing device is easy to damage the detector and needs to be purged again after replacing the gas cylinder, which wastes time.

[0005] To achieve the above-mentioned purpose, the present invention provides a nitrogen purge device for purging the mirror surface of a spectrometer detector, the nitrogen purge device comprising a nitrogen bottle, an inlet pipe connected to the nitrogen bottle, a one-inlet-two-outlet valve whose inlet end is connected to the inlet pipe, a purge gas path connected to one outlet end of the one-inlet-two-outlet valve, and a pressure-limiting check valve connected to the other outlet end of the one-inlet-two-outlet valve, wherein the purge gas path is arranged with one end away from the one-inlet-two-outlet valve toward the mirror surface of the spectrometer detector.

[0006] As a further improvement of the present invention, the nitrogen purging device also includes an air pressure sensor for detecting the pressure in the intake pipe, and a controller electrically connected to the air pressure sensor and the one-inlet-two-outlet valve, and the controller is used to control the operation of the one-inlet-two-outlet valve according to the air pressure detected by the air pressure sensor.

[0007] As a further improvement of the present invention, the controller is electrically connected to the spectrometer detector to control the operation of the spectrometer detector.

[0008] As a further improvement of the present invention, the nitrogen purge device further includes a battery, and the battery is electrically connected to the controller and the one-inlet-two-outlet valve to provide power.

[0009] As a further improvement of the present invention, the battery is a rechargeable battery.

[0010] As a further improvement of the present invention, the nitrogen purge device also includes a mainboard electrically connected to the rechargeable battery and the controller.

[0011] The present invention also provides a method for using the nitrogen purge device, wherein the nitrogen purge device further comprises a pressure sensor for detecting the pressure in the intake pipe, a controller electrically connected to the pressure sensor and the one-inlet-two-outlet valve, and the controller is electrically connected to the spectrometer detector. The method for using the nitrogen purge device comprises the following steps:

[0012] S1: Nitrogen cylinder supplies gas, and nitrogen enters the one-inlet-two-outlet valve through the inlet pipe;

[0013] S2: The controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the pressure-limiting check valve for a period of time T1;

[0014] S3: The controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the purge gas path;

[0015] S4: After a period of time T2, the controller controls the spectrometer detector to perform cooling and data measurement.

[0016] As a further improvement of the present invention, the method for using the nitrogen purge device further includes step S5 performed when the nitrogen bottle is replaced, and step S5 includes the following steps:

[0017] S51: the controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the pressure-limiting check valve;

[0018] S52: within a period of time T3, the air pressure sensor detects that the air pressure in the air inlet pipe first decreases and then increases, and at this time it is determined that the nitrogen bottle has been replaced. After a period of time T4, the controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the purge air path, and the controller controls the spectrometer detector to perform cooling and data measurement;

[0019] S53: After a period of time T3, the air pressure sensor detects that the air pressure in the intake pipe first decreases and then increases. At this time, it is determined that the replacement of the nitrogen bottle is completed. After a period of time T4, the controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the purge air path. After a period of time T5, the controller controls the spectrometer detector to perform cooling and data measurement.

[0020] As a further improvement of the present invention, the controller is electrically connected to the nitrogen bottle. After the nitrogen bottle supplies gas for a period of time T6, the spectrometer detector does not perform cooling or data measurement, and the controller controls the nitrogen bottle to stop supplying gas.

[0021] As a further improvement of the present invention, the controller controls the nitrogen cylinder, the one-inlet-two-outlet valve and the spectrometer detector to work or stop working at any time.

[0022] The beneficial effect of the present invention is that the nitrogen purge device of the present invention can start the spectrometer detector after the air in the air intake pipe is exhausted by setting a one-inlet and two-outlet valve and a pressure-limiting check valve. The nitrogen purge device of the present invention can better protect the spectrometer detector, while saving the time of the staff and avoiding the waste of nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the nitrogen purge device and the spectrometer detector of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 As shown, the nitrogen purge device of the present invention is used to purge the mirror surface of the spectrometer detector 10.

[0026] The nitrogen purging device includes a nitrogen cylinder 1, an air inlet pipe 2 connected to the nitrogen cylinder 1, a one-inlet-two-outlet valve 3 whose air inlet end is connected to the air inlet pipe 2, a purge air path 4 connected to one air outlet end of the one-inlet-two-outlet valve 3, a pressure-limiting check valve 5 connected to the other air outlet end of the one-inlet-two-outlet valve 3, an air pressure sensor 6 for detecting the pressure in the air inlet pipe 2, a controller 7 electrically connected to the air pressure sensor 6 and the one-inlet-two-outlet valve 3, a battery 8, and a mainboard 9 electrically connected to the battery 8 and the controller 7.

[0027] The nitrogen cylinder 1 can be replaced after use, and the air inlet pipe 2 is used to connect the nitrogen cylinder 1 and the one-inlet-two-outlet valve 3 .

[0028] The battery 8 is electrically connected to the controller 7 and the one-in-two-outlet valve 3 to provide power for the controller 7. In this embodiment, the battery 8 is a rechargeable battery, so that the operation of the controller 7 can be continued in the case of power failure. When the controller 7 detects that there is no external circuit, it automatically enters a low power consumption mode; further, when the power of the battery 8 is low, the controller 7 can also cut off the connection with the battery 8 after recording the state, thereby avoiding excessive discharge of the battery 8 and damaging the battery 8, and restarting after the battery 8 is connected to an external power source.

[0029] The end of the purge gas path 4 away from the one-inlet-two-outlet valve 3 is arranged toward the mirror surface of the spectrometer detector 10. After the purge gas path 4 purges the mirror surface for a period of time, the spectrometer detector 10 performs cooling and data measurement, which can prevent water vapor from condensing on the mirror surface and causing damage to the spectrometer detector 10. Generally, in actual operation, the purge needs to be performed for more than one hour.

[0030] The pressure-limiting check valve 5 can prevent air from flowing back into the one-in-two-outlet valve 3. Before starting to purge the mirror, nitrogen is passed into the pressure-limiting check valve 5 for a period of time to discharge the residual air in the intake pipe 2, thereby preventing the residual air in the intake pipe 2 from damaging the mirror surface.

[0031] The one-inlet-two-outlet valve 3 can be electrically controlled by the controller 7. The controller 7 can control from which outlet the one-inlet-two-outlet valve 3 outputs nitrogen. In this embodiment, the one-inlet-two-outlet valve 3 is connected to the battery 8 and the external AC power at the same time to drive the one-inlet-two-outlet valve 3 to switch the gas path. In this embodiment, the one-inlet-two-outlet valve 3 is a two-position three-way self-holding solenoid valve, which can maintain the switched state without continuing to power the gas path.

[0032] The controller 7 is also electrically connected to the spectrometer detector 10 to control the operation of the spectrometer detector 10. After blowing for one hour, the spectrometer detector 10 can be started and the mirror surface can continue to be purged.

[0033] By setting a controller 7 to control the one-inlet-two-outlet valve 3, when the nitrogen cylinder 1 is replaced, the one-inlet-two-outlet valve 3 is connected to the pressure-limiting check valve 5 to prevent air backflow. After the nitrogen cylinder 1 is replaced, the controller 7 controls the one-inlet-two-outlet valve 3 to be connected to the purge air path 4, so that the spectrometer detector 10 can be started directly without waiting for a period of time to be purged again, thereby improving the detection efficiency.

[0034] The air pressure sensor 6 shown is a high-speed air pressure sensor, which can determine the nitrogen state in real time. If a change in air pressure occurs, the information is transmitted to the main board 9 or the controller 7 in a timely manner.

[0035] In this embodiment, the main board 9 is electrically connected to the controller 7 to control the operation of the controller 7 according to different working conditions, especially the controller 7 can control the operation of the one-inlet-two-outlet valve 3 according to the air pressure data detected by the air pressure sensor 6. The main board 9 has a timing function, and can be connected to the controller 7 to control the nitrogen cylinder 1, the one-inlet-two-outlet valve 3 and the spectrometer detector 10 to work at any time. This setting can start the mirror of the spectrometer detector 10 to be purged in advance before the staff go to work, and the staff can directly use the spectrometer detector 10 for detection after going to work.

[0036] The method for using the nitrogen purge device of the present invention comprises the following steps:

[0037] S1: Nitrogen cylinder 1 supplies gas, and nitrogen enters the one-inlet-two-outlet valve 3 through the inlet pipe 2;

[0038] S2: the controller 7 controls the one-inlet-two-outlet valve 3 to allow nitrogen to enter the pressure-limiting check valve 5 for a period of time T1. In this embodiment, T1 is 30 seconds. The purpose of this step is to ensure that the residual air in the original intake pipe 2 is removed;

[0039] S3: the controller 7 controls the one-inlet-two-outlet valve 3 so that nitrogen enters the purge gas path 4;

[0040] S4: After a period of time T2, the controller 7 controls the spectrometer detector 10 to perform cooling and data measurement. In this embodiment, T2 is 1 hour. The spectrometer detector 10 is used for cooling and data measurement after purging for 1 hour, which can effectively prevent residual water vapor from condensing on the mirror surface.

[0041] The method for using the nitrogen purge device further includes step S5 performed when the nitrogen cylinder 1 is replaced, and step S5 includes the following steps:

[0042] S51: the controller 7 controls the one-inlet-two-outlet valve 3 so that the nitrogen enters the pressure-limiting check valve 5;

[0043] S52: within a period of time T3, the air pressure sensor 6 detects that the air pressure in the air inlet pipe 2 first decreases and then increases, and at this time it is determined that the nitrogen bottle 1 has been replaced. After a period of time T4, the controller 7 controls the one-inlet-two-outlet valve 3 to allow nitrogen to enter the purge air path 4, and the controller 7 controls the spectrometer detector 10 to perform cooling and data measurement;

[0044] S53: After a period of time T3, the air pressure sensor 6 detects that the air pressure in the air inlet pipe 2 first decreases and then increases. At this time, it is judged that the replacement of the nitrogen bottle 1 is completed. After a period of time T4, the controller 7 controls the one-inlet-two-outlet valve 3 to allow nitrogen to enter the purge air path 4. After a period of time T5, the controller 7 controls the spectrometer detector 10 to perform cooling and data measurement.

[0045] In this embodiment, T3 is ten minutes, T4 is 30 seconds, and generally, the replacement of the nitrogen bottle 1 can be completed within 10 minutes. If the replacement of the nitrogen bottle 1 is completed within 10 minutes, after the air in the intake pipe 2 is cleared, the mirror of the spectrometer detector 10 is directly purged, and the spectrometer detector 10 is controlled to perform cooling and data measurement. On the contrary, if it is not completed within more than 10 minutes, it is judged that there is a risk of condensation of water vapor on the mirror surface, so it is necessary to purge the mirror surface again for a period of time after clearing the air in the intake pipe 2, and then start the spectrometer detector 10 for cooling and data measurement. Among them, T6 is 1 hour, or it can be shortened for a period of time according to actual conditions.

[0046] The nitrogen purging device of the present invention also has an intelligent stop function. Specifically, after the nitrogen cylinder 1 supplies gas for a period of time T6, the spectrometer detector 10 does not perform cooling or data measurement, and the controller 7 controls the nitrogen cylinder 1 to stop supplying gas.

[0047] The nitrogen purging device of the present invention is provided with a one-inlet-two-outlet valve 3 and a pressure-limiting check valve 5, so that the spectrometer detector 10 can be started after the air in the air inlet pipe 2 is exhausted; in addition, the pressure-limiting check valve 5 can be connected when the nitrogen bottle 1 is replaced to prevent air backflow, and the spectrometer detector 10 can be used directly after the replacement is completed without purging again. The use method of the nitrogen purging device of the present invention can ensure the purging time, and at the same time, the pressure-limiting check valve 5 can be connected when the nitrogen bottle 1 is replaced to save the detection time. In addition, the nitrogen tank can be closed when the spectrometer detector 10 is not started after purging for a period of time to avoid nitrogen waste. The nitrogen purging device of the present invention and the use method of the nitrogen purging device can better protect the spectrometer detector 10, while saving the time of the staff and avoiding the waste of nitrogen.

[0048] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A nitrogen purge device for purging the mirror surface of a spectrometer detector, characterized in that: The nitrogen purge device comprises a nitrogen cylinder, an air inlet pipe connected to the nitrogen cylinder, a one-inlet-two-outlet valve whose air inlet end is connected to the air inlet pipe, a purge air path connected to one air outlet end of the one-inlet-two-outlet valve, and a pressure-limiting check valve connected to the other air outlet end of the one-inlet-two-outlet valve, wherein one end of the purge air path away from the one-inlet-two-outlet valve is arranged toward the mirror surface of the spectrometer detector; When replacing the nitrogen cylinder, control the one-inlet and two-outlet valves to allow the nitrogen to enter the pressure-limiting check valve; If the pressure in the air inlet pipe first drops and then rises within a period of time T3, the nitrogen bottle is replaced, and after a period of time T4, the one-inlet and two-outlet valves are controlled to allow nitrogen to enter the purge gas path, and the spectrometer detector is controlled to perform cooling and data measurement; If the pressure in the air inlet pipe first drops and then rises after a period of time T3, the nitrogen bottle is replaced, and after a period of time T4, the one-inlet and two-outlet valves are controlled to allow the nitrogen to enter the purge air path, and after a period of time T5, the spectrometer detector is controlled to perform cooling and data measurement; the nitrogen purge device also includes an air pressure sensor for detecting the pressure in the air inlet pipe, and a controller electrically connected to the air pressure sensor and the one-inlet and two-outlet valves, and the controller is used to control the operation of the one-inlet and two-outlet valves according to the air pressure detected by the air pressure sensor.

2. The nitrogen purge device according to claim 1, characterized in that: The controller is electrically connected to the spectrometer detector to control the operation of the spectrometer detector.

3. The nitrogen purge device according to claim 1, characterized in that: The nitrogen purge device further includes a battery, and the battery is electrically connected to the controller and the one-inlet-two-outlet valve to provide power.

4. The nitrogen purge device according to claim 3, characterized in that: The battery is a rechargeable battery.

5. The nitrogen purge device according to claim 4, characterized in that: The nitrogen purge device also includes a mainboard electrically connected to the rechargeable battery and the controller.

6. A method for using the nitrogen purge device according to any one of claims 1 to 5, wherein the nitrogen purge device further comprises a pressure sensor for detecting the pressure in the intake pipe, a controller electrically connected to the pressure sensor and the one-inlet-two-outlet valve, and the controller is electrically connected to the spectrometer detector, characterized in that: The method for using the nitrogen purge device comprises the following steps: S1: Nitrogen cylinder supplies gas, and nitrogen enters the one-inlet-two-outlet valve through the inlet pipe; S2: The controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the pressure-limiting check valve for a period of time T1; S3: The controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the purge gas path; S4: After a period of time T2, the controller controls the spectrometer detector to perform cooling and data measurement; The method for using the nitrogen purge device further includes step S5 performed when the nitrogen bottle is replaced, and step S5 includes the following steps: S51: the controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the pressure-limiting check valve; S52: within a period of time T3, the air pressure sensor detects that the air pressure in the air inlet pipe first decreases and then increases, and at this time it is determined that the nitrogen bottle has been replaced. After a period of time T4, the controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the purge air path, and the controller controls the spectrometer detector to perform cooling and data measurement; S53: After a period of time T3, the air pressure sensor detects that the air pressure in the intake pipe first decreases and then increases. At this time, it is determined that the replacement of the nitrogen bottle is completed. After a period of time T4, the controller controls the one-inlet and two-outlet valves to allow nitrogen to enter the purge air path. After a period of time T5, the controller controls the spectrometer detector to perform cooling and data measurement.

7. The method for using the nitrogen purge device according to claim 6, wherein the controller is electrically connected to the nitrogen bottle, and is characterized in that: After the nitrogen cylinder supplies gas for a period of time T6, the spectrometer detector does not perform cooling or data measurement, and the controller controls the nitrogen cylinder to stop supplying gas.

8. The method for using the nitrogen purge device according to claim 7, characterized in that: The controller controls the nitrogen cylinder, the one-inlet-two-outlet valve and the spectrometer detector to work or stop working at any time.

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