Liquefied petroleum gas sampling device with extremely simple structure and recovery supporting function

Abstract

The utility model provides a liquefied petroleum gas sampling device which is extremely simple in structure and supports recovery. The liquefied petroleum gas sampling device aims at solving the problems that a traditional sampling device is low in efficiency, large in potential safety hazard, inconvenient in sampling amount adjustment and the like. The device consists of a tubular pressure-resistant container, an inlet valve, an outlet valve, a quantitative discharge pipe, a filling head and a stainless steel braided hose, the filling head is specially designed, so that connection and recovery are facilitated, the sampling process is simplified, and operation is simple, safe and reliable. According to the device, the sampling efficiency is remarkably improved, the labor intensity is reduced, and the safety is enhanced; meanwhile, waste liquid recovery is supported, and environmental pollution is prevented.

Description

Technical Field

[0001] This utility model relates to the field of detection equipment technology, and in particular to a liquefied petroleum gas sampling device with a minimal structure that supports recycling. Background Technology

[0002] Liquefied petroleum gas (LPG) is an important energy source for daily life, and accurate quality testing during its production and distribution is crucial. Currently, LPG sampling mainly occurs at residential LPG refueling stations, and the sampling is carried out according to the petrochemical industry standard SH / T0233-92 "Liquefied Petroleum Gas Sampling Method". However, traditional dual-valve sampling devices have significant design shortcomings in this application scenario.

[0003] First, the traditional sampling device consists of a three-way valve, two valves, and three stainless steel braided hoses combined into a sampling tube connected to a dual-valve sampler (see reference). Figure 3 This method relies on up to four valves to control the sampling process. This is not only inefficient, requiring operators to spend a lot of time and effort manually operating each valve in a complex environment, which can easily lead to sampling failure due to operational errors; but also because there are too many connection points for the sampling tube, which are prone to loosening and causing equipment damage.

[0004] Secondly, the sampler needs to be flushed before sampling. When flushing the dual-valve sampler with liquefied petroleum gas, the sampler outlet valve needs to be opened to release the gaseous sample. At this time, the liquefied gas released into the atmosphere is only an arm's length away from the operator, without any protection, which brings great safety hazards.

[0005] Finally, the traditional dual-valve sampler relies on weighing to adjust the sampling volume, which requires multiple operations to complete the adjustment and is also inconvenient. Utility Model Content

[0006] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a liquefied petroleum gas sampling device with a minimal structure that supports recovery, thereby solving the problems mentioned in the background art.

[0007] To achieve the above technical objectives, the present invention provides a liquefied petroleum gas sampling device with a minimally shaped structure that supports recycling. The device includes a sampler 1, which is a tubular pressure-resistant container with an inlet valve 2 and an outlet valve 3 at its two ends. A metering discharge pipe 4 is provided at the connection end of the inlet valve 2 and the sampler 1. A filling head 5 is provided at the inlet of the inlet valve 2, and a stainless steel braided hose 6 is provided at the outlet of the outlet valve 3. The filling head 5 is compatible with the dispensing nozzle of an LPG refueling station. The length of the stainless steel braided hose 6 ensures that dispensing does not pose a safety threat to operators.

[0008] Furthermore, the filling head 5 includes a connector 501, a reducing pipe 502, and a connecting nut 503. The two ends of the reducing pipe 502 are connected to the connector 501 and the connecting nut 503, respectively. The connecting nut 503 is matched with the inlet of the inlet valve 2. The connector 501 is a special angle valve for liquefied petroleum gas cylinders with the handle and corresponding connecting rod removed, and the connecting rod part is sealed with a blind hole nut, and it is only used as a hollow internal connection port.

[0009] Furthermore, the sampling process includes the following steps:

[0010] S1: The filling gun of the liquefied petroleum gas filling station is connected to the filling head 5;

[0011] S2: Close the outlet valve 3, open the inlet valve 2, fill the sampler 1 with liquid phase sample, close the inlet valve 2, open the outlet valve 3, discharge a portion of the gas phase sample, then invert the sampler to discharge the remaining liquid phase sample through the outlet valve 3. Repeat the above rinsing operation at least three times.

[0012] S3: After the liquid residue in the sampler is drained during the last rinse, immediately close the outlet valve 3, open the inlet valve 2, fill the container with the liquid sample, close the inlet valve 2, and disconnect the filling head 5 connected to the inlet valve 2 and the stainless steel braided hose 6 connected to the outlet valve 3.

[0013] S4: Place sampler 1 in an upright position, connect inlet valve 2 to stainless steel braided hose 6, slightly open inlet valve 2, and discharge liquid sample accounting for 20% of the sampler's capacity through metering discharge tube 4. As soon as vapor appears, close inlet valve 2.

[0014] S5: Disassemble the stainless steel braided hose 6 and immerse both ends of the sampler 1 in a water bath to check for leaks.

[0015] Furthermore, the sampling process includes the following steps:

[0016] S1: The filling head 5 is set on the outlet valve 3, the stainless steel braided hose 6 is set on the inlet valve 2, and the filling gun of the liquefied petroleum gas filling station is connected to the filling head 5.

[0017] S2: Close inlet valve 2, open outlet valve 3, fill sampler 1 with liquid sample, then close outlet valve 3, remove liquid filling gun, connect filling head 5 to the residual liquid recovery equipment of civilian liquefied gas tank at gas station, and let residual liquid be recovered through outlet valve 3. Repeat the above flushing operation at least three times.

[0018] S3: After the liquid residue in the sampler is drained during the last rinse, immediately close the outlet valve 3, disconnect the recovery device connected to the filling head 5, and then connect the liquid dosing gun; open the outlet valve 3 and fill the container with the liquid sample, close the outlet valve 3, and then disconnect the filling head 5;

[0019] S4: Place the sampler 1 in an upright position with the inlet valve 2 facing upwards, slightly open the inlet valve 2, and discharge the liquid sample, which accounts for 20% of the sampler's capacity, through the quantitative discharge tube 4. As soon as the vapor appears, close the inlet valve 2.

[0020] S5: Disassemble the stainless steel braided hose 6 and immerse both ends of the sampler 1 in a water bath to check for leaks.

[0021] Compared with the prior art, the beneficial effects of this utility model include:

[0022] 1. This utility model simplifies the structure of the sampling device, reducing connection points, valves, and pipelines. Sampling requires only the operation of one cylinder valve, and discharging requires only the operation of another. This design significantly improves sampling efficiency and reduces the workload of operators. Furthermore, the design using only the cylinder's own valve ensures easy maintenance of the sampling process. Even in the event of valve failure, simply replacing one cylinder effectively prevents sampling interruptions, thus guaranteeing the continuity of sampling work.

[0023] 2. This utility model improves the safety and reliability of liquefied petroleum gas samplers by installing an exhaust hose at the sampler outlet valve 3, which combines the release of gas phase samples during sampling and the discharge of waste liquid during sampler rinsing into a single pipeline; it also standardizes the emission of toxic and harmful gases during the sampling process, thereby enhancing personnel safety.

[0024] 3. This utility model features a quantitative discharge tube inside the dual-valve sampler. Adjusting the sampling volume simply requires placing the sampler in an upright position, slightly opening inlet valve 2 to discharge the liquid, and closing inlet valve 2 as soon as steam appears. The entire process is completed in a single step. This simple and effective process ensures the validity of the sampling work.

[0025] 4. If the gas station is equipped with a residual liquid recovery device for civilian liquefied gas tanks, the special structure of the filling head can be properly connected to the recovery device, so that the waste liquid generated during the sampling process can be recovered, preventing the emission of toxic and harmful gases from causing environmental damage. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a liquefied petroleum gas sampling device with a minimal structure that supports recycling, provided by this utility model;

[0027] Figure 2 This is a schematic diagram of the filling head of a liquefied petroleum gas sampling device with a minimally shaped structure that supports recycling, provided by this utility model.

[0028] Figure 3This is a diagram of the sampling device shown in the petrochemical industry standard SH / T0233-92 "Liquefied Petroleum Gas Sampling Method". Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] Reference Figure 1 This utility model provides a liquefied petroleum gas sampler, which mainly includes a filling head 5 and a sampler 1. The sampler 1 is mostly made of pressure-resistant steel cylinder, and an inlet valve 2 and an outlet valve 3 are installed at its two ends respectively. A quantitative discharge pipe 4 is installed in the inlet valve 2 of the sampler 1, and a stainless steel braided hose 6 is installed at the outlet of the outlet valve 3.

[0031] Reference Figure 2 The filling head 5 includes a connector 501 modified from a liquefied petroleum gas cylinder angle valve, a reducing pipe fitting 502, and a connecting nut 503 that mates with the inlet valve 2 or the outlet valve 3. During the modification, the handle and corresponding connecting rod of the special angle valve of the liquefied petroleum gas cylinder are removed, and the connecting rod part is sealed with a blind hole nut, and it is only used as a hollow internal connection port. One end of the reducing pipe fitting 502 is connected to the connector 501, and the other end is connected to the connecting nut 503.

[0032] To facilitate understanding of this utility model, the following is combined with... Figure 1 - Figure 2 The working principle of this solution will be explained in detail:

[0033] According to the petrochemical industry standard SH / T0233-92 "Liquefied Petroleum Gas Sampling Method", the complete liquefied gas sampling procedure consists of five steps: 1. Flushing the sampling tube, 2. Flushing the sampler, 3. Sampling, 4. Adjusting the sampling volume, and 5. Leakage check.

[0034] Example 1: Waste liquid generated during the sampling process is discharged into the atmosphere.

[0035] Before sampling, the inlet valve 2 of the sampler 1 is connected to the filling head 5, and the outlet valve 3 of the exhaust end is connected to a stainless steel braided hose 6. Then, the filling gun of the liquefied petroleum gas filling station is connected to the filling head 5.

[0036] The sampling tube is rinsed, but since the filling head 5 is a straight-through pipe connector, the sampling tube is omitted, and this step is skipped.

[0037] Second, rinse the sampler. Close the outlet valve 3 of sampler 1, open the inlet valve 2 to fill sampler 1 with liquid sample, close the inlet valve 2, open the outlet valve 3 to discharge a portion of the gas sample, then invert the sampler to discharge the remaining liquid sample through the outlet valve 3. Repeat the above rinsing operation at least three times.

[0038] For the third sampling, after the liquid residue in the sampler has been drained during the last rinse, immediately close the outlet valve 3, open the inlet valve 2, fill the container with the liquid sample, close the inlet valve 2, and disconnect the filling head 5 connected to the inlet valve 2 and the stainless steel braided hose 6 connected to the outlet valve 3.

[0039] Fourth, adjust the sampling volume by connecting the inlet valve 2 of sampler 1 to the stainless steel braided hose 6. Since the inlet valve 2 is equipped with a metering discharge tube 4 of appropriate length, it can ensure the discharge of liquid phase sample accounting for 20% of the sampler's capacity. With the inlet valve 2 connected to the hose 3 facing upwards, place the sampler in an upright position, slightly open the inlet valve 2, and the liquid will be discharged. As soon as the vapor appears, close the inlet valve 2.

[0040] Fifth, leak check: Disconnect the stainless steel braided hose 6 connected to the inlet valve 2, and immerse both ends of the sampler 1 in a water bath to check for leaks.

[0041] Example 2: Recycling of waste liquid generated during the sampling process

[0042] Before sampling, the exhaust outlet valve 3 of sampler 1 is connected to the filling head 5, and then the filling gun of the liquefied petroleum gas filling station is connected to the filling head 5.

[0043] The sampling tube is rinsed, but since the filling head 5 is a straight-through pipe connector, the sampling tube is omitted, and this step is skipped.

[0044] Second, flush the sampler. Close the inlet valve 2 of sampler 1, open the outlet valve 3, and fill sampler 1 with liquid sample. Then close the outlet valve 3. Disconnect the filling gun and connect the filling head 5 to the residual liquid recovery equipment of the civilian liquefied gas tank at the gas station. Allow the residual liquid to be recovered through the outlet valve 3. Repeat the above flushing operation at least three times.

[0045] For the third sampling, after the liquid residue in the sampler has been drained during the last rinse, immediately close the outlet valve 3; disconnect the liquid filling gun from the recovery equipment, open the outlet valve 3, fill the container with the liquid sample, close the outlet valve 3, and disconnect the filling head 5 connected to the outlet valve 3.

[0046] Fourth, adjust the sampling volume. Connect the inlet valve 2 of sampler 1 to the stainless steel braided hose 6. Since the inlet valve 2 is equipped with a metering discharge tube 4 of appropriate length, it can ensure that 20% of the sampler's capacity of liquid phase sample is discharged. With the inlet valve 2 of the hose 3 connected facing upwards, place the sampler in an upright position, slightly open the inlet valve 2, and the liquid will be discharged. As soon as the vapor appears, close the inlet valve 2.

[0047] Fifth, leak check: Disconnect the stainless steel braided hose 6 connected to the inlet valve 2, and immerse both ends of the sampler 1 in a water bath to check for leaks.

[0048] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A liquefied petroleum gas sampling device with a simple structure and supporting recycling, comprising a sampler which is a tubular pressure-resistant container with an inlet valve and an outlet valve arranged at two ends respectively, and a quantitative discharge pipe arranged on the connecting end of the sampler and connected with the inlet valve, characterized in that: The inlet of the inlet valve is provided with a filling head, and the outlet of the outlet valve is provided with a stainless steel braided hose, the filling head is matched with a liquid filling gun of a liquefied petroleum gas filling station, and the length of the stainless steel braided hose ensures that the operator is not threatened during discharge.

2. The LPG sampling device of claim 1, wherein: The filling head comprises a connecting head, a reducing pipe and a connecting nut, two ends of the reducing pipe are connected with the connecting head and the connecting nut respectively, the connecting nut is matched with the inlet of the inlet valve, and the connecting head is a special angle valve for a liquefied petroleum gas cylinder, the handle and the corresponding connecting rod of which are removed, the connecting rod part is closed by a blind hole nut, and the connecting head is only used as a hollow connecting port.

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