Gas cylinder cleaning device and method with gas pressure detection and emptying functions

Abstract

The invention provides a gas cylinder cleaning device and method with gas pressure detection and emptying functions, the device comprises a gas cylinder and a cleaning assembly, and further comprises a connecting pipe connected with an exhaust port of the gas cylinder, the connecting pipe is provided with a pressure sensor, the pressure sensor is connected with a suction pipe and an emptying pipe, and the suction pipe is connected with the cleaning assembly. A first valve is arranged on the suction pipe, the suction pipe is connected with the cleaning assembly, and a second valve and a flow controller are arranged on the emptying pipe. The pressure in the gas cylinder is detected through the pressure sensor, opening and closing of the second valve can be controlled accordingly, gas in the gas cylinder is safely emptied in cooperation with the flow controller, and therefore the problems that high-pressure gas impacts the molecular pump, the molecular pump is damaged, and potential safety hazards are caused to personnel are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas standard substances, and in particular to a gas cylinder cleaning device and method with gas pressure detection and emptying functions. Background Art

[0002] As a measuring instrument, gas standard materials play an important role in ensuring the value of measurement in analysis, detection and calibration. Therefore, gas standard materials have high uniformity, stability and value accuracy. Before preparing gas standard material samples, it is necessary to ensure that there will be no chemical reaction between the various components of the mixed gas and the container materials, valves and transfer systems used. Therefore, when gas cylinders are used as containers for storing gas standard material samples, ensuring that there is no residual gas, impurities, moisture and adsorption inside the gas cylinders is a basic prerequisite for making high-quality gas standard samples. Cleaning and handling of gas cylinders are key steps to ensure the quality of gas standard samples.

[0003] At present, the cleaning device for the gas cylinder 10 mainly adopts a pump-based air extraction method, including a mechanical pump 20 and a molecular pump 30, such as Figure 1 As shown, the mechanical pump 20 is connected to the gas cylinder 10, and the molecular pump 30 is connected to the mechanical pump 20. The mechanical pump 20 draws the vacuum degree in the gas cylinder 10 to 10 -2 hPa, and then the molecular pump 30 draws the vacuum degree in the gas cylinder 10 to 10 -6 hPa.

[0004] However, the current cleaning device lacks pressure detection and early warning. In actual operation, some unused gas cylinders will be mistakenly mixed into the gas cylinders to be cleaned. The internal pressure of the unused gas cylinders is high. After connecting them to the pump, on the one hand, the high-pressure gas will impact the molecular pump, causing damage to the molecular pump. On the other hand, the high-pressure gas is also likely to cause safety hazards to personnel. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a gas cylinder cleaning device and method with gas pressure detection and emptying functions, which can detect the pressure of the gas cylinder, reduce damage to the equipment, and reduce safety hazards.

[0006] The present invention is achieved in that:

[0007] In the first aspect, the present invention provides a gas cylinder cleaning device with gas pressure detection and emptying functions, including a gas cylinder and a cleaning component, and also including a connecting pipe connected to the exhaust port of the gas cylinder, the connecting pipe is provided with a pressure sensor, the pressure sensor is connected to a suction pipe and an emptying pipe, the suction pipe is provided with a first valve, the suction pipe is connected to the cleaning component, and the emptying pipe is provided with a second valve and a flow controller.

[0008] Furthermore, the cleaning component includes a mechanical pump and a molecular pump, the mechanical pump is connected to the suction tube, and the molecular pump is connected to the mechanical pump.

[0009] Furthermore, it also includes a control module, which is connected to the pressure sensor, the first valve, the second valve, the flow controller and the cleaning component.

[0010] In a second aspect, the present invention provides a gas cylinder cleaning method with gas pressure detection and emptying functions, comprising the following steps:

[0011] S1. Before the gas cylinder is connected to the connecting pipe, the control system closes the first valve;

[0012] S2. After opening the valve of the gas cylinder, the pressure sensor detects the pressure in the gas cylinder. If the internal pressure of the gas cylinder is greater than or equal to the safety value, the control module controls the second valve to open, and the gas inside the gas cylinder is discharged through the exhaust pipe until the internal pressure of the gas cylinder is less than the safety value. Subsequently, the control module controls the second valve to close, the first valve to open, and starts the cleaning component to clean the gas cylinder;

[0013] If the internal pressure of the gas cylinder is lower than the safety value, the control module controls the second valve to close, the first valve to open, and starts the cleaning component to clean the gas cylinder.

[0014] Furthermore, in step S2, the safety value is set to 0.2 MPa.

[0015] Furthermore, in step S2, when the second valve is opened, the control system gradually increases the opening of the second valve according to data fed back by the pressure sensor.

[0016] Furthermore, in step S2, when the second valve is opened, the control system adjusts the opening of the flow controller according to data fed back by the pressure sensor.

[0017] The advantages of the present invention are: the pressure inside the gas cylinder is detected by the pressure sensor, and the opening and closing of the second valve can be controlled thereby, and the gas in the gas cylinder can be safely emptied in cooperation with the flow controller, thereby preventing the high-pressure gas from impacting the molecular pump, causing damage to the molecular pump and causing safety hazards to personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0019] Figure 1 The present invention is a schematic diagram of the structure of a gas cylinder cleaning device for gas standard substances in the prior art.

[0020] Figure 2 The present invention is a schematic structural diagram of a gas cylinder cleaning device with gas pressure detection and emptying functions.

[0021] Description of the numbers in the figure:

[0022] 1. Gas cylinder; 2. Cleaning assembly; 21. Mechanical pump; 22. Molecular pump; 3. Connecting pipe; 4. Pressure sensor; 5. First valve; 6. Second valve; 7. Flow controller; 8. Control module. DETAILED DESCRIPTION

[0023] For example, see Figure 1 to Figure 2 The present invention provides a gas cylinder cleaning device with gas pressure detection and emptying functions, including a gas cylinder 1 and a cleaning component 2, and also including a connecting pipe 3 connected to the exhaust port of the gas cylinder 1, a pressure sensor 4 is arranged on the connecting pipe 3, the pressure sensor 4 is connected to a suction pipe and an emptying pipe, a first valve 5 is arranged on the suction pipe, the suction pipe is connected to the cleaning component 2, and a second valve 6 and a flow controller 7 are arranged on the emptying pipe. In the initial state, the first valve 5 is in a closed state. When the internal pressure of the gas cylinder 1 is greater than or equal to 0.2MPa, the first valve 5 remains closed, the second valve 6 is opened, and the high-pressure gas stored in the gas cylinder 1 is gradually emptied through the emptying pipe. The flow controller 7 can control the emptying flow rate for safe discharge. It is worth mentioning that during emptying, as the internal pressure of the gas cylinder 1 decreases, the opening of the second valve 6 and the flow controller 7 gradually increases.

[0024] When the internal pressure of the gas cylinder 1 is less than 0.2 MPa, the first valve 5 is opened, the second valve 6 is closed, and the cleaning component 2 evacuates the gas cylinder 1 .

[0025] Specifically, the cleaning assembly 2 includes a mechanical pump 21 and a molecular pump 22. The mechanical pump 21 is connected to a suction pipe, and the molecular pump 22 is connected to the mechanical pump 21. The mechanical pump 21 draws the vacuum degree inside the gas cylinder 1 to 10 -2 hPa, and then the molecular pump 22 draws the vacuum degree in the gas cylinder 1 to 10 -6 hPa. The vacuum degree inside the gas cylinder 1 reaches 10 -6 hPa, the interior of the gas cylinder 1 is deemed to contain no gaseous substances, and the cleaning of the gas cylinder 1 is completed.

[0026] Specifically, a control module 8 is also included, and the control module 8 is connected to the pressure sensor 4, the first valve 5, the second valve 6, the flow controller 7 and the cleaning component 2. Through the data fed back by the pressure sensor 4, the control module 8 can control the first valve 5, the second valve 6, the flow controller 7 and the cleaning component 2 to operate.

[0027] For example 2, please refer to Figure 1 to Figure 2 The present invention provides a method for cleaning a gas cylinder 1 with gas pressure detection and emptying functions, comprising the following steps:

[0028] S1. Before the gas cylinder 1 is connected to the connecting pipe 3, the control system closes the first valve 5; that is, in the initial state, the first valve 5 is in a closed state to prevent the operator from mistakenly connecting the unused gas cylinder 1 to the connecting pipe 3. After the valve of the gas cylinder 1 is opened, the high-pressure gas impacts the molecular pump 22, causing damage to the molecular pump 22.

[0029] S2. After opening the valve of the gas cylinder 1, the pressure sensor 4 detects the pressure inside the gas cylinder 1. If the internal pressure of the gas cylinder 1 is greater than or equal to the safety value, the control module 8 controls the second valve 6 to open, and the gas inside the gas cylinder 1 is discharged through the exhaust pipe until the internal pressure of the gas cylinder 1 is less than the safety value. When the gas cylinder 1 is emptied, as the internal pressure of the gas cylinder 1 decreases, the opening of the second valve 6 and the flow controller 7 gradually increases. After the internal pressure of the gas cylinder 1 is less than the safety value, the control module 8 controls the second valve 6 to close, the first valve 5 to open, and starts the cleaning component 2 to clean the gas cylinder 1;

[0030] If the internal pressure of the gas cylinder 1 is lower than the safety value, the control module 8 controls the second valve 6 to close, the first valve 5 to open, and starts the cleaning component 2 to clean the gas cylinder 1 .

[0031] During cleaning, the mechanical pump 21 draws the vacuum degree inside the gas cylinder 1 to 10 -2 hPa, and then the molecular pump 22 draws the vacuum degree in the gas cylinder 1 to 10 -6 hPa.

[0032] Specifically, in step S2, the safety value is set to 0.2 MPa.

[0033] Specifically, in step S2 , when the second valve 6 is opened, the control system gradually increases the opening of the second valve 6 according to data fed back by the pressure sensor 4 .

[0034] Specifically, in step S2 , when the second valve 6 is opened, the control system adjusts the opening of the flow controller 7 according to the data fed back by the pressure sensor 4 .

[0035] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A gas cylinder cleaning device with gas pressure detection and emptying functions, comprising a gas cylinder and a cleaning assembly, characterized in that: It also includes a connecting pipe connected to the exhaust port of the gas cylinder, the connecting pipe is provided with a pressure sensor, the pressure sensor is connected to a suction pipe and an emptying pipe, the suction pipe is provided with a first valve, the suction pipe is connected to a cleaning component, and the emptying pipe is provided with a second valve and a flow controller.

2. A gas cylinder cleaning device with gas pressure detection and emptying functions as claimed in claim 1, characterized in that: The cleaning component comprises a mechanical pump and a molecular pump, wherein the mechanical pump is connected to a suction pipe, and the molecular pump is connected to the mechanical pump.

3. A gas cylinder cleaning device with gas pressure detection and emptying functions as claimed in claim 1, characterized in that: The device also includes a control module, which is connected to the pressure sensor, the first valve, the second valve, the flow controller and the cleaning component.

4. A gas cylinder cleaning method with gas pressure detection and emptying functions, characterized in that: The steps include: S1. Before the gas cylinder is connected to the connecting pipe, the control system closes the first valve; S2. After opening the valve of the gas cylinder, the pressure sensor detects the pressure in the gas cylinder. If the internal pressure of the gas cylinder is greater than or equal to the safety value, the control module controls the second valve to open, and the gas inside the gas cylinder is discharged through the exhaust pipe until the internal pressure of the gas cylinder is less than the safety value. Subsequently, the control module controls the second valve to close, the first valve to open, and starts the cleaning component to clean the gas cylinder; If the internal pressure of the gas cylinder is lower than the safety value, the control module controls the second valve to close, the first valve to open, and starts the cleaning component to clean the gas cylinder.

5. A gas cylinder cleaning method with gas pressure detection and emptying functions as claimed in claim 4, characterized in that: In step S2, the safety value is set to 0.2 MPa.

6. A gas cylinder cleaning method with gas pressure detection and emptying functions as claimed in claim 4, characterized in that: In step S2, when the second valve is opened, the control system gradually increases the opening of the second valve according to data fed back by the pressure sensor.

7. A gas cylinder cleaning method with gas pressure detection and emptying functions as claimed in claim 4, characterized in that: In step S2, when the second valve is opened, the control system adjusts the opening of the flow controller according to the data fed back by the pressure sensor.

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