Sampler convenient for liquefied petroleum gas detection
By designing a liquefied petroleum gas sampler with a check valve and a pressure gauge, the inconvenience of sampling and safety hazards are solved, and a uniform mixing and safe and reliable sampling process is achieved, which improves the accuracy of the detection data.
Patent Information
- Application Number
- CN202421442681.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-06-24
AI Technical Summary
During the existing liquefied petroleum gas testing process, sampling is inconvenient and easy to leak, resulting in inaccurate data and safety hazards, and uneven mixing leads to large fluctuations in experimental results.
A sampler including a sampling bottle, inlet tube, sample outlet tube, connector, check valve, pressure gauge and sealing cap is designed. The pressure is monitored using a check valve and pressure gauge to prevent reflux and overpressure, ensuring uniform mixing and safe operation.
A uniform sampling of liquefied petroleum gas is achieved, data accuracy and safety are improved, and the dangers caused by sampler rupture and excessive pressure are avoided.
Smart Images
Figure CN223272242U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical inspection, in particular to a sampler which is convenient for detecting liquefied petroleum gas. Background Art
[0002] Liquefied petroleum gas (LPG) is a colorless, volatile liquid obtained by pressurizing and cooling natural gas or petroleum to liquefy it. Its main components are propane, butane, propylene, and small amounts of hydrocarbons such as acetylene and ethylene. It also contains small amounts of methyl tert-butyl ether (MTBE) and methanol. LPG is a gas at room temperature and pressure, but it can be liquefied into a liquid under pressurized or cooled conditions. It is typically transported or stored in steel cylinders, where it appears as a mixture of gas and liquid.
[0003] In the field of chemical inspection, gas chromatography is a common tool for analyzing MTBE and methanol content in liquefied petroleum gas (LPG). Currently, inspectors generally use sampling bags for sampling. During the sampling process, inspectors place the bag over the outlet of the LPG cylinder, leveraging the high pressure within the cylinder to rapidly flow the LPG, both in a gaseous and liquid state, into the bag. However, improper handling, such as failure to close the valve promptly, can lead to overinflation and rupture of the bag, resulting in LPG leakage and posing a health risk to inspectors.
[0004] Furthermore, although the LPG compounds in the gas bag will vaporize after being heated on the hot plate, the methanol and MTBE in the LPG may not be mixed evenly. This uneven mixing of LPG will lead to large fluctuations in experimental data and non-parallel results in subsequent gas chromatograph analysis. Utility Model Content
[0005] In order to solve the deficiencies in the prior art, the utility model provides a sampler that is convenient for detecting liquefied petroleum gas.
[0006] To achieve the above-mentioned purpose, the technical solution of the utility model is: a sampler that is convenient for liquefied petroleum gas detection, comprising a sampling bottle, one end of the sampling bottle is detachably connected to a sampling tube, a sampling outlet tube is provided at the bottom of the sampling bottle, the other end of the sampling tube is detachably connected to a connector, an injection valve is provided on the sampling tube, a pressure relief valve is provided on the sampling outlet tube, a sampling port is provided on the top of the sampling bottle, and a sealing cover matching the sampling port is provided on the top of the sampling port.
[0007] Furthermore, a one-way valve is provided in the injection tube, and the one-way valve is provided between the injection valve and the sampling bottle.
[0008] Furthermore, a pressure gauge is provided on the sampling tube, and the pressure gauge is provided between the one-way valve and the sampling bottle.
[0009] Furthermore, a silicone pad is provided between the sealing cover and the sampling port.
[0010] Furthermore, a sampling hole is provided on the end cover of the sealing cover.
[0011] Furthermore, the sampling hole has a structure that is wide at the top and narrow at the bottom.
[0012] Furthermore, the connector and the sampling tube, the sampling tube and the sampling bottle, and the sealing cover and the sampling port are all threaded connections.
[0013] Furthermore, the sampling bottle is a pressure-resistant steel cylinder.
[0014] Furthermore, the connector is a quick connector.
[0015] Furthermore, the injection valve and the pressure relief valve are both angle valves.
[0016] The beneficial effects achieved by the utility model are:
[0017] 1. The utility model is connected to the gas outlet of the liquefied petroleum gas cylinder through a connector. The liquefied petroleum gas in the liquefied petroleum gas cylinder enters the sampling bottle under the action of pressure and is mixed with the butanone previously filled in the sampling bottle to a saturated solution. The liquefied petroleum gas is evenly mixed under the action of butanone, ensuring uniform sampling of the liquefied petroleum gas and significantly improving the accuracy and reliability of the data.
[0018] 2. The sampling bottle in the utility model is a pressure-resistant steel cylinder, which will not be damaged by excessive pressure. It overcomes the problems of high pressure of liquefied petroleum gas and difficulty in sampling in the existing technology, and provides a strong guarantee for safe and efficient sampling.
[0019] 3. A one-way valve is provided in the sampling tube of the utility model to prevent the butanone in the sampling bottle from flowing back into the liquefied petroleum gas cylinder and contaminating the liquefied petroleum gas; the pressure gauge can monitor the pressure inside the sampling bottle at any time to prevent the pressure inside the sampling bottle from being too high, which may push out the sealing cover and cause safety hazards. When the sampling bottle is pressurized too quickly and exceeds the expected range, in order to avoid danger, the staff can quickly open the pressure relief valve for safe pressure relief to ensure the safety and reliability of the operation process. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0021] Figure 2 This is a diagram of the connection between the sampling port and the sealing cover.
[0022] Explanation of the markings in the figure: 1. Connector; 2. Injection tube; 3. Injection valve; 4. One-way valve; 5. Pressure gauge; 6. Sampling bottle; 7. Sampling port; 8. Silicone pad; 9. Sealing cap; 10. Sampling hole; 11. Sample outlet tube; 12. Pressure relief valve. DETAILED DESCRIPTION
[0023] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of a sampler for liquefied petroleum gas detection of the present invention in conjunction with the accompanying drawings.
[0024] like Figures 1 to 2 As shown, a sampler convenient for liquefied petroleum gas detection includes a sampling bottle 6, one end of the sampling bottle 6 is threadedly connected to a sampling tube 2, the other end of the sampling tube 2 is threadedly connected to a connector 1, an injection valve 3 is provided on the sampling tube 2, a one-way valve 4 is provided inside the sampling tube 2 between the injection valve 3 and the sampling bottle 6, a pressure gauge 5 is also provided on the sampling tube 2, the pressure gauge 5 is arranged between the one-way valve 4 and the sampling bottle 6, a sample outlet tube 11 is provided at the bottom of the sampling bottle 6, a pressure relief valve 12 is provided on the sample outlet tube 11, a sampling port 7 is provided on the top of the sampling bottle 6, a sealing cover 9 is threadedly connected to the sampling port 7, a silicone pad 8 is provided on the inside of the sealing cover 9, the silicone pad 8 plays a sealing role to prevent sample leakage at the connection between the sampling port 7 and the sealing cover 9, a sampling hole 10 is provided at the center of the sealing cover 9, the sampling hole 10 is a structure that is wide at the top and narrow at the bottom, and the sampling hole 10 as a whole is an inverted frustum structure.
[0025] Sampling bottle 6 typically uses a pressure-resistant steel cylinder, which can withstand the pressure of liquefied petroleum gas and will not be damaged by excessive pressure. Connector 1 is a quick-connect connector compatible with the liquefied petroleum gas cylinder. This connector allows inspectors to quickly connect the sampling bottle 6 to the liquefied petroleum gas cylinder, improving work efficiency. Both the injection valve 3 and the pressure relief valve 12 are angle valves, which are relatively easy to control and can quickly close the corresponding pipelines.
[0026] When in use, the utility model is first cleaned with butanone and leak tested. After checking that everything is normal, the utility model is assembled and the butanone waste liquid in the sampling bottle 6 is discharged from the sampling bottle 6 through the sample outlet tube 11. After the preparation work is completed, unscrew the sealing cap 9, use a pipette to add a standard volume of butanone into the sampling bottle 6, tighten the sealing cap 9, connect the connector 1 to the air outlet of the liquefied petroleum gas cylinder, open the valve and the air inlet valve of the liquefied petroleum gas cylinder in turn, and the liquefied petroleum gas flows into the sampling bottle 6 through the one-way valve 4 under the action of pressure. Observe the reading of the pressure gauge 5. When the reading of the pressure gauge 5 reaches the expected pressure, close the injection valve 3 and the valve of the liquefied petroleum gas cylinder in turn. After the sampling is completed, put the sampling bottle 6 into the refrigerator and freeze it at 4°C for 10 minutes to mix the liquefied petroleum gas evenly in the butanone. Finally, the inspector uses a flat-head micro-injector to pass through the sampling hole 10 and the silica gel pad 8 for sampling, and injects the sampled flat-head micro-injector into the gas chromatograph for component analysis of the liquefied petroleum gas.
[0027] The end of the sample outlet tube 11 is connected to a sampling gas bag. When the liquefied petroleum gas flow rate is too fast, causing the pressure in the sampling bottle 6 to rise too quickly, and the reading of the pressure gauge 5 exceeds the expected pressure, in order to avoid danger, the inspector needs to close the injection valve 3 in time and open the pressure relief valve 12 to relieve the pressure. After the pressure relief is completed, re-sample.
[0028] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.
Claims
1. A sampler for liquefied petroleum gas detection, characterized by: The invention comprises a sampling bottle (6), one end of the sampling bottle (6) is detachably connected to a sampling tube (2), a sampling outlet tube (11) is provided at the bottom of the sampling bottle (6), the other end of the sampling tube (2) is detachably connected to a connector (1), the sampling tube (2) is provided with an injection valve (3), the sampling outlet tube (11) is provided with a pressure relief valve (12), the top of the sampling bottle (6) is provided with a sampling port (7), and the top of the sampling port (7) is provided with a sealing cover (9) that matches the sampling port (7).
2. A sampler for liquefied petroleum gas detection according to claim 1, characterized in that: A one-way valve (4) is provided in the injection tube (2), and the one-way valve (4) is provided between the injection valve (3) and the sampling bottle (6).
3. A sampler for liquefied petroleum gas detection according to claim 2, characterized in that: The sample injection tube (2) is provided with a pressure gauge (5), and the pressure gauge (5) is provided between the one-way valve (4) and the sampling bottle (6).
4. The sampler for liquefied petroleum gas detection according to claim 1, characterized in that: A silica gel pad (8) is provided between the sealing cover (9) and the sampling port (7).
5. The sampler for liquefied petroleum gas detection according to claim 4, characterized in that: The end cover of the sealing cover (9) is provided with a sampling hole (10).
6. The sampler for liquefied petroleum gas detection according to claim 5, characterized in that: The sampling hole (10) has a structure that is wide at the top and narrow at the bottom.
7. The sampler for liquefied petroleum gas detection according to claim 1, characterized in that: The connector (1) and the sampling tube (2), the sampling tube (2) and the sampling bottle (6), and the sealing cover (9) and the sampling port (7) are all threadedly connected.
8. The sampler for liquefied petroleum gas detection according to claim 1, characterized in that: The sampling bottle (6) is a pressure-resistant steel bottle.
9. The sampler for liquefied petroleum gas detection according to claim 1, characterized in that: The connector (1) is a quick connector.
10. The sampler for liquefied petroleum gas detection according to claim 1, characterized in that: The injection valve (3) and the pressure relief valve (12) are both angle valves.