A special detection device for alcohol resistance of biomass methanol fuel engine oil

Abstract

This invention belongs to the field of engine oil testing technology, specifically a dedicated testing device for the alcohol resistance of biomass methanol fuel engine oil, including a gas chromatograph; a pusher plate is slidably connected to the gas chromatograph; a heater is fixed inside the pusher plate; the device extracts headspace gas by pressing and sealing a metal cylinder with a sealing cover, replacing the traditional sampling needle and quantitative loop, simplifying the sampling steps, and the entire process is closed, reducing gas leakage and improving detection accuracy. At the same time, the separator component enables simultaneous heating and sequential extraction of multiple samples, reducing waiting time and improving detection efficiency. In addition, oil and water samples can be placed separately in the same metal cylinder, with the oil sample used for testing and the water sample used to generate water vapor for steam cleaning of the pipeline. After one test, residual impurities on the inner wall can be removed without disassembly for cleaning, reducing workload and the risk of cross-contamination, and ensuring the reliability of multiple test results.

Description

Technical Field

[0001] This invention belongs to the field of engine oil testing technology, specifically a special testing device for the alcohol resistance performance of biomass methanol fuel engine oil. Background Technology

[0002] Biomass methanol fuel engine oil is a special lubricant designed specifically for engines that use methanol as fuel. Unlike ordinary engine oil, it needs to address the challenge of methanol fuel easily seeping into the oil pan and causing the engine oil to be diluted. Therefore, its formula contains highly efficient viscosity index improvers and special anti-corrosion additives, which can maintain stable oil film strength even under the erosion of methanol and water, reducing problems such as wear, rust and sludge deposits on engine parts.

[0003] The core task of the gas chromatograph used in the traditional biomass methanol fuel engine oil alcohol resistance test is to heat the oil sample through headspace injection to evaporate the mixed methanol into a gaseous state, and then carry it into the chromatographic column by the carrier gas for separation. Finally, the FID detector is used to determine the amount of methanol residue in the engine oil diluted by methanol fuel, thereby quantitatively evaluating the oil's ability to resist fuel dilution.

[0004] When testing the alcohol resistance of biomass methanol fuel engine oil using a dedicated gas chromatograph, the engine oil sample is first sealed in a headspace vial and heated to 70-80°C to allow the mixed methanol to evaporate until the gas and liquid phases reach equilibrium. Then, the headspace sampler injects the headspace gas into the gas chromatograph inlet through a high-temperature transfer line. Traditional gas chromatographs require inserting a sampling needle into the headspace vial to inject carrier gas, followed by the use of a quantitative loop to extract the headspace gas. This not only makes the sampling process cumbersome, but also makes it easy for some headspace gas to leak out when injecting carrier gas and switching quantitative loops.

[0005] Therefore, the present invention provides a dedicated testing device for the alcohol resistance performance of biomass methanol fuel engine oil. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A special testing device for the alcohol resistance performance of biomass methanol fuel engine oil, comprising a gas chromatograph; a push plate slidably connected to the gas chromatograph; a heater fixedly connected inside the push plate; three metal cylinders mounted on the heater; an electric cylinder fixedly connected inside the gas chromatograph; a pressure plate fixedly connected to the output end of the electric cylinder; three sealing covers fixedly connected to the bottom end of the pressure plate, and the sealing covers corresponding to the metal cylinders; a first connecting pipe fixedly connected inside the sealing covers; a second connecting pipe connected to the transmission line inside the gas chromatograph via an electronic control valve, and the second connecting pipe corresponding to the first connecting pipe; a separating component is provided inside the metal cylinders, the separating component being used to separate different test samples.

[0008] Preferably, the partition assembly includes a first partition plate, a double-hole plate, a second partition plate, and a first solenoid valve; the first partition plate is fixed inside the metal cylinder; the double-hole plate is fixed to the bottom end of the sealing cover plate; the two second partition plates are fixed between the sealing cover plate and the double-hole plate; and the first solenoid valve is fixed to the second partition plate.

[0009] Preferably, a three-way block is fixedly connected between the electronic control valve on the gas chromatograph transmission line and the second connecting pipe; a second solenoid valve is fixedly connected to the three-way block; and a multi-way pipe is fixedly connected to the second solenoid valve.

[0010] Preferably, a liquid storage tank is fixedly connected to the end of the multi-port pipe away from the second solenoid valve, and the liquid storage tank is fixedly connected inside the gas chromatograph; a water pump is fixedly connected to the liquid storage tank, and the output end of the water pump is connected to the multi-port pipe, while the input end of the water pump is located inside the liquid storage tank; a refrigerator is fixedly connected inside the liquid storage tank; and a condenser tube is fixedly connected to the output end of the refrigerator.

[0011] Preferably, a sealing plate is fixed between the two second partition plates, and the sealing plate is located above the center of the double-hole plate; a funnel groove is formed on the upper surface of the sealing plate, and a third solenoid valve is fixed to the bottom of the funnel groove.

[0012] Preferably, three heat-conducting plates are fixedly connected inside the push plate, and the heat-conducting plates are located on one side of the metal cylinder; a heat-conducting ring is fixedly connected to one end of each heat-conducting plate, and the heat-conducting ring is sleeved on the outside of the metal cylinder.

[0013] Preferably, a first heat-conducting block is fixedly connected to the heat-conducting plate; a heat-concentrating cylinder is fixedly connected to the second connecting pipe; a second heat-conducting block is fixedly connected to the bottom end of the heat-concentrating cylinder, and the second heat-conducting block corresponds to the first heat-conducting block.

[0014] Preferably, a telescopic tube is fixedly connected to the carrier gas delivery tube inside the gas chromatograph, and the other end of the telescopic tube is fixedly connected to the pressure plate; a gas guide tube is fixedly connected inside the pressure plate and the sealing cover plate; a one-way valve is fixedly connected to one end of the gas guide tube near the first connecting pipe, and the telescopic tube can be connected to the pressure plate, the gas guide tube, the one-way valve and the first connecting pipe.

[0015] Preferably, a water collection box is fixedly connected inside the liquid storage tank, and a sedimentation tank is provided in the middle of the water collection box; a first filter layer and a second filter layer are fixedly connected from bottom to top in the sedimentation tank of the water collection box, and the input end of the water pump is located below the first filter layer.

[0016] Preferably, a metal bend is fixed to the bottom of the condenser tube, and multiple metal bends are provided; multiple guide plates are fixed to the inside of the liquid storage tank near the metal bends, and the multiple guide plates are inclined.

[0017] The beneficial effects of this invention are as follows: 1. The present invention discloses a dedicated testing device for the alcohol resistance of biomass methanol fuel engine oil. Multiple biomass methanol fuel engine oil samples are poured into three metal cylinders, which are divided into multiple storage areas by a separator. A pusher plate pushes the metal cylinders into a gas chromatograph and seals them. An electric cylinder drives a pressure plate to press down three sealing covers, sealing the metal cylinders. At this time, a first connecting pipe is connected to the transmission line of an electronic control valve through a second connecting pipe. A heater heats the metal cylinders and the samples inside to a set temperature, causing methanol to evaporate into a gaseous state. The headspace gas enters the transmission line through the connecting pipe and is carried by the carrier gas into the chromatographic column for separation. Finally, the methanol residue is determined by an FID detector. This device quantitatively assesses the fuel dilution tolerance of oil products. It extracts headspace gas using a sealed metal cylinder and cap, replacing traditional sampling needles and metering loops. This simplifies sampling and reduces gas leakage, improving detection accuracy. The separator allows for simultaneous heating and sequential extraction of multiple samples, reducing waiting time and increasing detection efficiency. Furthermore, oil and water samples can be placed separately in the same metal cylinder; the oil sample is used for testing, while the water sample generates steam for cleaning the pipeline. This removes residual impurities from the inner wall after a single test, eliminating the need for disassembly and cleaning, reducing workload and the risk of cross-contamination, and ensuring the reliability of multiple test results.

[0018] 2. The biomass methanol fuel engine oil alcohol resistance testing equipment of the present invention simultaneously stores oil samples and pure water in a metal cylinder, and a heater causes both to vaporize synchronously. During testing, the No. 1 solenoid valve and electronic control valve corresponding to the oil sample are first opened, and the headspace gas of the oil sample is sent to the transmission line for testing through the pipeline. After the test is completed, the above valves are closed, and the previously closed No. 1 solenoid valve and No. 2 solenoid valve are opened, allowing water vapor to be discharged through the pipeline, No. 2 solenoid valve, and multi-port pipe. The water vapor is used to flush away the residual oil sample volatiles on the inner wall of the pipeline. This method can achieve efficient cleaning without disassembling the equipment, avoids interference from residual components to subsequent tests, and ensures the accuracy and stability of multiple batches of continuous test results. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the sealing cover plate in this invention; Figure 3 This is a schematic diagram of the structure of the second heat-conducting block in this invention; Figure 4 This is a schematic diagram of the structure of the first heat-conducting block in this invention; Figure 5 This is a partial structural cross-sectional view of the metal cylinder in this invention; Figure 6 This is a schematic diagram of the heat-conducting ring in this invention; Figure 7 This is a schematic diagram of the structure of the double-hole plate in this invention; Figure 8 This is a schematic diagram of the structure of the second partition plate in this invention; Figure 9 This is a partial structural cross-sectional view of the liquid storage tank in this invention.

[0021] In the diagram: 1. Gas chromatograph; 11. Push plate; 13. Heater; 14. Metal cylinder; 15. Electric cylinder; 16. Pressure plate; 17. Sealing cover plate; 18. Connecting pipe No. 1; 19. Connecting pipe No. 2; 2. Separator plate No. 1; 21. Double-hole plate; 22. Separator plate No. 2; 23. Solenoid valve No. 1; 3. T-junction block; 31. Solenoid valve No. 2; 32. Multi-port pipe; 4. Liquid storage tank; 41. Water pump; 42. Refrigerator; 43. Condenser tube; 5. Sealing plate; 51. Solenoid valve No. 3; 6. Heat-conducting plate; 61. Heat-conducting ring; 7. Heat-conducting block No. 1; 71. Heat-conducting block No. 2; 72. Heat-concentrating cylinder; 8. Telescopic tube; 81. Gas guide tube; 82. One-way valve; 9. Water collection box; 91. Filter layer No. 1; 92. Filter layer No. 2; 93. Metal bend; 94. Guide plate. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 8 As shown in the embodiment of the present invention, a special testing device for the alcohol resistance of biomass methanol fuel engine oil includes a gas chromatograph 1; a pusher plate 11 is slidably connected to the gas chromatograph 1; a heater 13 is fixedly connected inside the pusher plate 11; three metal cylinders 14 are installed on the heater 13; an electric cylinder 15 is fixedly connected inside the gas chromatograph 1; a pressure plate 16 is fixedly connected to the output end of the electric cylinder 15; three sealing covers 17 are fixedly connected to the bottom end of the pressure plate 16, and the sealing covers 17 correspond to the metal cylinders 14; a first connecting pipe 18 is fixedly connected inside the sealing cover 17; a second connecting pipe 19 is provided on the transmission line inside the gas chromatograph 1 through an electronic control valve, and the second connecting pipe 19 can correspond to the first connecting pipe 18; a separating component is provided inside the metal cylinders 14, which is used to separate different test samples; when using the gas chromatograph 1 to test the alcohol resistance of biomass methanol fuel engine oil... First, various biomass methanol fuel engine oil samples are poured into the interior of three metal cylinders 14. The separator can divide the three metal cylinders 14 into multiple sample storage areas. Then, the pusher plate 11 is pushed into the interior of the gas chromatograph 1 for sealing. The output end of the electric cylinder 15 drives the pressure plate 16 and the three sealing cover plates 17 to extend downward until the three sealing cover plates 17 seal the three metal cylinders 14. At this time, the first connecting pipe 18 can be connected to the transmission line connected to the electronic control valve through the second connecting pipe 19. The heater 13 starts to heat the metal cylinders 14 and the samples inside the metal cylinders 14. The temperature is heated to 70-80°C to make the mixed methanol evaporate into a gaseous state. The gaseous headspace gas reaches the transmission line connected to the electronic control valve through the first connecting pipe 18 and the second connecting pipe 19. It is carried by the carrier gas into the chromatographic column of the gas chromatograph 1 for separation. Finally, the residual amount of methanol diluted by methanol fuel in the engine oil is determined by the FID detector, thereby quantitatively evaluating the oil's ability to resist fuel dilution.

[0024] The present invention improves upon the basic detection principle of the existing gas chromatograph by using a metal cylinder 14 and a sealing cover plate 17 to extract headspace gas, replacing the traditional method of using a sampling needle and quantitative loop to extract headspace gas. This simplifies the sampling process and aims to improve the efficiency and accuracy of detecting the alcohol resistance of biomass methanol fuel engine oil. The entire extraction process is completed in a closed space, reducing the probability of headspace leakage and ensuring the accuracy of the detection results. Meanwhile, by separating the three metal cylinders 14 with the separator component, multiple different samples can be heated and extracted sequentially at the same time, reducing the waiting time for multiple samplings and improving detection efficiency. Furthermore, an oil sample and a water sample can be placed in a metal cylinder 14 respectively. The oil sample is used for testing, while the water sample is used to generate steam to clean the first connecting pipe 18 and the second connecting pipe 19. After one test is completed, the residual impurities on the inner wall of the pipe can be cleaned by steam without the need for additional disassembly of the cleaning device. This reduces the workload and prevents residual impurities from interfering with the testing of the next set of samples, thus ensuring the reliability of multiple test results.

[0025] The separation assembly includes a first separator plate 2, a double-hole plate 21, a second separator plate 22, and a first solenoid valve 23. The first separator plate 2 is fixed inside the metal cylinder 14. The double-hole plate 21 is fixed to the bottom end of the sealing cover plate 17. The two second separator plates 22 are fixed between the sealing cover plate 17 and the double-hole plate 21. The first solenoid valve 23 is fixed to the second separator plate 22. When storing multiple samples in the metal cylinder 14, the first separator plate 2 is fixed at the center inside the metal cylinder 14, dividing each metal cylinder 14 into two. In the sample storage area, the sealing cover 17 extends downward with the output end of the electric cylinder 15, driving the double-hole plate 21 to be pressed into the interior of the metal cylinder 14. Two second-order partition plates 22 are fixed on the double-hole plate 21, corresponding to the two sample storage areas. Two first-order solenoid valves 23 control the discharge of headspace gas generated in the two sample storage areas respectively, realizing the sequential export of headspace gas of a single component. This prevents the headspace gas of different samples from mixing and crossing in the extraction pipeline, reducing the possibility of component confusion interfering with the detection results, and ensuring the accuracy of the results when multiple batches of samples are detected simultaneously.

[0026] like Figures 1 to 3 , Figure 5 , Figure 6 , Figure 8As shown, a three-way block 3 is fixedly connected between the electronic control valve and the second connecting pipe 19 on the transmission line of the gas chromatograph 1; a second solenoid valve 31 is fixedly connected to the three-way block 3; a multi-port pipe 32 is fixedly connected to the second solenoid valve 31; when an oil sample and a pure water are stored inside the metal cylinder 14, the heater 13 simultaneously heats the oil sample and the pure water to vaporize them. The headspace gas extracted from the oil sample is sent to the transmission line to cooperate with the carrier gas for detection. At this time, the first solenoid valve 23 and the electronic control valve corresponding to the oil sample are open, while the second solenoid valve 31 and another first solenoid valve 23 are in the closed state. After the detection is completed, the inside of the first connecting pipe 18 and the second connecting pipe 19 are cleaned, and the heated... Pure water is vaporized into water vapor. The previously closed solenoid valves 23 and 31 are opened, and the previously opened solenoid valve 23 and electronic control valve are closed. The water vapor is discharged through connecting pipe 18, connecting pipe 19, solenoid valve 31, and multi-port pipe 32. The water vapor is used to flush and clean the oil sample volatiles remaining on the inner wall of the pipeline, removing residual impurities and reducing interference from residual components to subsequent oil sample testing. No additional disassembly of equipment is required for cleaning in a short time, simplifying the pipeline cleaning process after testing. At the same time, it ensures that the results of the next test are not affected by the components of the previous test, and the accuracy of the results of multiple batches of continuous testing is guaranteed.

[0027] like Figures 1 to 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9As shown, the end of the multi-port pipe 32 furthest from the second solenoid valve 31 is fixedly connected to a liquid storage tank 4, and the liquid storage tank 4 is fixedly connected inside the gas chromatograph 1; a water pump 41 is fixedly connected to the liquid storage tank 4, and the output end of the water pump 41 is connected to the multi-port pipe 32, while the input end of the water pump 41 is located inside the liquid storage tank 4; a cooler 42 is fixedly connected inside the liquid storage tank 4; a condenser tube 43 is fixedly connected to the output end of the cooler 42; when water vapor is used to clean the first connecting pipe 18 and the second connecting pipe 19, the water vapor is sent through the first connecting pipe 18 and the second connecting pipe 19 to the liquid storage tank 4 connected by the multi-port pipe 32, and the cooler 42 works to cool the condenser tube 43. The water vapor sent to the liquid storage tank 4 can be condensed and temporarily stored on the condenser tube 43. After cleaning, the impurity-containing condensate is precipitated, which plays a role in the recovery of water vapor; when a After prolonged use, a significant amount of condensate accumulates in connecting pipes 18 and 19. This condensate is used for backwashing and cleaning. Pump 41 extracts the clean upper layer of condensate and returns it to the multi-way pipe 32. The condensate then passes through the multi-way pipe 32, solenoid valve 31, tee block 3, connecting pipe 19, and connecting pipe 18 to backwash and clean the interior of connecting pipes 18 and 19. The backwashed condensate can be sent to the empty metal cylinder 14 for external removal, thus reducing the consumption of external water resources and lowering the equipment's operating costs. The condensate is pumped back into the multi-way pipe 32 by pump 41 for backwashing and usually does not need to be discharged. When it is necessary to clean the long-term accumulated cooling water in the lower layer, simply pull out the push plate 11 and remove the metal cylinder 14 to pour out the cooling water. During the alcohol resistance test of biomass methanol fuel engine oil, solenoid valve 31 is closed. At this time, connecting pipe 18 is connected to the transmission line of the electronic control valve via connecting pipe 19. Heater 13 heats the sample inside the metal cylinder 14, causing the mixed methanol to evaporate into a gaseous state. The gaseous headspace gas passes through connecting pipe 18, connecting pipe 19, and the three-way valve 3 to reach the transmission line connected to the electronic control valve. It is then carried by the carrier gas into the chromatographic column of the gas chromatograph 1 for separation. The gas is then detected at the FID detector. During pipeline cleaning, the electronic control valve is closed, while the second solenoid valve 31 is open. Water vapor passes through the first connecting pipe 18, the second connecting pipe 19, and the three-way block 3 to the second solenoid valve 31, and then through the multi-way pipe 32 to the storage tank 4. Only one of the detection flow path and the cleaning flow path is open at any given time. Water vapor is only used for steam cleaning of the pipeline and does not enter the detection system of the gas chromatograph 1 at all, thereby reducing the impact of water vapor on the detection accuracy of the gas chromatograph 1.

[0028] like Figures 1 to 3 , Figure 5 , Figure 8As shown, a sealing plate 5 is fixed between the two second-level partition plates 22, and the sealing plate 5 is located above the center of the double-hole plate 21; a funnel groove is opened on the upper surface of the sealing plate 5, and a third-level solenoid valve 51 is fixed at the bottom of the funnel groove; when backwashing with recycled condensate, the water pump 41 draws the settled condensate and sends it into the second connecting pipe 19 and the first connecting pipe 18 for backwashing. The condensate after backwashing reaches the sealing plate 5. At this time, the two first-level solenoid valves 23 are in the closed state, and the third-level solenoid valve 51 is in the open state. The condensate flows along the funnel groove and the third-level solenoid valve 51 into the space between the double-hole plate 21 and the sealing plate 5 for temporary storage, waiting for subsequent cleaning, thus serving as a temporary storage for the backwashed condensate.

[0029] Three heat-conducting plates 6 are fixedly connected inside the push plate 11, and the heat-conducting plates 6 are located on one side of the metal cylinder 14. A heat-conducting ring 61 is fixedly connected to one end of each heat-conducting plate 6, and the heat-conducting ring 61 is sleeved on the outside of the metal cylinder 14. When the heater 13 heats the three metal cylinders 14, the heat-conducting ring 61, in conjunction with the heat-conducting plates 6, is fixed around the metal cylinders 14. When the sealing cover 17 is pressed over the metal cylinders 14, the end of the heat-conducting plate 6 away from the heat-conducting ring 61 can adhere to the high-temperature area around the FID detector. The heat-conducting plate 6, in conjunction with the heat-conducting ring 61, can conduct some of the heat around the FID detector to the metal cylinders 14. It can preheat the metal cylinder 14 and the sample inside the metal cylinder 14, reduce the waiting time for the heater 13 to heat up the metal cylinder 14, and balance the temperature around the FID detector, reducing the impact of local heat accumulation on the detection accuracy of the FID detector. It should be noted that in the above embodiment, the heat-conducting plate 6 only fits the high-temperature area around the FID detector and does not contact the detector body. The heat-conducting plate 6 and the heat-conducting ring 61 are installed at the metal cylinder 14. The heat-conducting plate 6 and the heat-conducting ring 61 slide with the push plate 11 to reach the vicinity of the FID detector and can absorb and conduct heat near the detector. It should be noted that the local heat accumulation described in the above embodiments refers to the redundant heat around the FID detector, not the temperature control heat of the detector itself. When the FID detector operates under stable temperature control, redundant residual heat and local hot spots can be generated outside its chamber. The heat-conducting plate 6 and heat-conducting ring 61 made of metal material remove the redundant heat around the FID detector to the room temperature metal cylinder 14. They do not conduct the temperature control heat of the detector body. The heat-conducting plate 6 only acts on the high temperature area around the detector and does not contact the detector body. The purpose is to balance the surrounding temperature, not to cool the detector, thereby ensuring the stability of the detector temperature control.

[0030] A first heat-conducting block 7 is fixedly attached to the heat-conducting plate 6; a heat-collecting cylinder 72 is fixedly attached to the second connecting pipe 19; a second heat-conducting block 71 is fixedly attached to the bottom end of the heat-collecting cylinder 72, and the second heat-conducting block 71 corresponds to the first heat-conducting block 7; when headspace gas is sent into the transmission line through the first connecting pipe 18 and the second connecting pipe 19, the heat-collecting cylinder 72 is fixed to the outside of the second connecting pipe 19. After the first heat-conducting block 7 and the second heat-conducting block 71 are attached to each other, the first heat-conducting block 7 can conduct some of the heat on the heat-conducting plate 6 to the heat-collecting cylinder 72 through the second heat-conducting block 71. The heat-collecting cylinder 72 absorbs heat and can keep the headspace gas passing through the second connecting pipe 19 warm, reduce the occurrence of temperature drop in the headspace gas during the transportation process, avoid the pre-condensation of some gaseous components due to temperature drop, ensure the stability of the headspace gas components entering the FID detector, and ensure the accuracy of the detection results; When testing the alcohol resistance of biomass methanol fuel engine oil, the output end of the electric cylinder 15 drives the pressure plate 16 and three sealing cover plates 17 to extend downwards until the three sealing cover plates 17 seal the three metal cylinders 14. The metal cylinders 14 and the sealing cover plates 17 are pressed together to form a fully enclosed headspace. The materials of the metal cylinders 14 and the sealing cover plates 17 are both rigid, so the headspace formed is a rigid structure with a fixed volume. The testing pipeline is rigidly connected to the first connecting pipe 18 and the second connecting pipe 19. The inner diameter and length of the pipeline are fixed, and the volume is also constant. The volume of the sample gas is a fixed value of the closed volume of the metal cylinder 14 and the fixed volume of the connecting pipe, which replaces the traditional quantitative ring and realizes constant volume gas quantitative measurement. In addition, the heater 13, together with the heat-conducting plate 6, the heat-conducting ring 61 and the heat-concentrating cylinder 72, conducts heat and can form a full-area heating and heat preservation structure, so that the sample is in gas-liquid equilibrium at a constant temperature of 70-80℃, the gas phase concentration is stable, and the quantitative consistency is guaranteed.

[0031] like Figures 1 to 3 , Figures 5 to 7As shown, a telescopic tube 8 is fixedly connected to the carrier gas delivery tube inside the gas chromatograph 1, and the other end of the telescopic tube 8 is fixedly connected to the pressure plate 16; a gas guide tube 81 is fixedly connected inside the pressure plate 16 and the sealing cover plate 17; a one-way valve 82 is fixedly connected to one end of the gas guide tube 81 near the first connecting tube 18, and the telescopic tube 8 can be connected to the pressure plate 16, the gas guide tube 81, the one-way valve 82 and the first connecting tube 18; after cleaning the inside of the first connecting tube 18 and the second connecting tube 19 with steam or condensate, moisture easily adheres to the inner walls of the first connecting tube 18 and the second connecting tube 19. By connecting the telescopic tube 8 to the carrier gas delivery tube inside the gas chromatograph 1, carrier gas is introduced into the inside of the telescopic tube 8. The carrier gas is sent to the first connecting tube 18 and the second connecting tube 19 through the gas guide tube 81 and the one-way valve 82 to purge, and then blown out through the multi-port tube 32 to remove the residual moisture adhering to the inner wall. The air is blown out and dried to reduce residual moisture from forming water vapor after the temperature rises, which would then enter the FID detector along with the headspace gas and interfere with the detection results. This further ensures the reliability of the detection results after cleaning the first connecting tube 18 and the second connecting tube 19. The carrier gas path is formed by the telescopic tube 8, the gas guide tube 81 and the one-way valve 82. The carrier gas is delivered into the sealed cavity under constant pressure to stabilize the injection pressure and reduce the injection deviation caused by pressure fluctuations. Moreover, the output end of the electric cylinder 15 drives the pressure plate 16 and the three sealing cover plates 17 to be rigidly pressed onto the three metal cylinders 14 for sealing. The metal cylinders 14 and the sealing cover plates 17 are pressed together to form a fully enclosed headspace cavity. The materials of the metal cylinders 14 and the sealing cover plates 17 are both rigid. This method of pressing and sealing, rigid docking and full-process sealing can reduce gas leakage, control the loss of injection gas, and ensure the balance of injection volume and pressure for each injection. During detection, solenoid valve 23 in the oil sample chamber is open, the electronic control valve is open, and the other valves are closed. The sample gas passes through connecting pipe 18 and connecting pipe 19, and enters the chromatographic column through the open electronic control valve. During cleaning, solenoid valves 23 in the water sample chamber and 31 in the water sample chamber are open, while the electronic control valve is closed. Water vapor passes through connecting pipe 18, connecting pipe 19, and solenoid valve 31 before being discharged into the storage tank 4. During purging, solenoid valves 23 in the water sample chamber and 31 in the water sample chamber are open, while the electronic control valve is closed. The carrier gas dries the passing pipeline. During backwashing, solenoid valves 23 in the water sample chamber and the electronic control valve are closed, while solenoid valve 31 in the water sample chamber is closed. When solenoid valves 31 and 51 are opened, water pump 41 extracts the clean condensate from the upper layer after sedimentation and returns it to the multi-port pipe 32. The condensate passes through the multi-port pipe 32, solenoid valve 31, three-way block 3, connecting pipe 19, and connecting pipe 18 to backwash and clean the inside of connecting pipe 18 and connecting pipe 19. The backwashed condensate can be sent to the empty metal cylinder 14. Through the coordinated control of solenoid valves 23, 31, 51, and the electronic control valve of the transmission line, the headspace gas can be extracted sequentially, and the gas path can be switched controllably. The conduction time, gas path path, and closing time of each injection can be consistent to ensure sample repeatability. During normal testing of the alcohol resistance performance of biomass methanol fuel engine oil, the carrier gas path (column supply) involves the carrier gas flowing through the existing carrier gas delivery main pipeline inside the gas chromatograph 1, via the transmission line, electronic control valve, No. 2 connecting pipe 19, and No. 1 connecting pipe 18 into the metal cylinder 14. This is used for headspace gas injection to supply the chromatographic column and FID detection. The electronic control valve is open, and the purge branch has no additional drive, only pushing sample gas normally. However, during purge, the carrier gas is directly taken from the carrier gas delivery pipeline, passing through the telescopic pipe 8, pressure plate 16, gas guide pipe 81, and one-way valve 82 to No. 1 connecting pipe 18, forming an independent purge branch. The electronic control valve is closed, and No. 2 solenoid valve 31 is open, allowing all the carrier gas to enter the purge branch and be discharged into the liquid storage tank 4 through the multi-port pipe 32. The two paths are not opened simultaneously, and the carrier gas will not be split, ensuring the normal gas supply process of the chromatographic column. The purge is performed independently after the detection, and the exhaust gas flows directly to the liquid storage tank 4, reducing the probability of any back pressure affecting the detection system.

[0032] like Figures 1 to 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9As shown, a water collection box 9 is fixedly connected inside the liquid storage tank 4, and a sedimentation tank is provided in the middle of the water collection box 9. A first filter layer 91 and a second filter layer 92 are fixedly connected from bottom to top in the sedimentation tank of the water collection box 9, and the input end of the water pump 41 is located below the first filter layer 91. After the water vapor cleans the first connecting pipe 18 and the second connecting pipe 19, the water vapor is discharged into the interior of the liquid storage tank 4 and condenses. The condensed water falls into the interior of the water collection box 9 and is then filtered by the second filter layer 92 and the first filter layer 91 at different levels. Finally, the condensed water settles in the sedimentation tank. Large particles of impurities are first filtered by the second filter layer 92, and then filtered by the first filter layer 91. Fine residual impurities are intercepted. Finally, the condensed water settles in the sedimentation tank. The condensed water below the first filter layer 91 can be backflushed and used to reduce the situation of impurities clogging the water pump 41 and the pipeline.

[0033] The bottom of the condenser tube 43 is fixedly connected to a metal bend 93, and multiple metal bends 93 are provided. Multiple guide plates 94 are fixedly connected inside the liquid storage tank 4 near the metal bends 93, and these guide plates 94 are inclined. When water vapor enters the liquid storage tank 4, the cooler 42 operates to cool the condenser tube 43. The multiple metal bends 93 absorb the temperature of the condenser tube 43 and simultaneously condense the water vapor. The multiple guide plates 94 are inclined at different angles to guide the incoming water vapor, directing it to the multiple metal bends 93, increasing the contact area between the water vapor and the metal bends 93, improving the efficiency of water vapor condensation, and reducing the accumulation of uncondensed water vapor at the top of the liquid storage tank 4. Simultaneously, the inclined guide plates 94 can guide the condensed water downwards along the slope, preventing condensate from accumulating on the surface of the guide plates 94 and affecting the subsequent guiding effect on the water vapor.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dedicated testing device for the alcohol resistance performance of biomass methanol fuel engine oil, characterized in that: The system includes a gas chromatograph; a pusher plate is slidably connected to the gas chromatograph; a heater is fixedly connected inside the pusher plate; three metal cylinders are mounted on the heater; an electric cylinder is fixedly connected inside the gas chromatograph; a pressure plate is fixedly connected to the output end of the electric cylinder; three sealing covers are fixedly connected to the bottom end of the pressure plate, and the sealing covers correspond to the metal cylinders; a first connecting pipe is fixedly connected inside the sealing cover; a second connecting pipe is provided on the transmission line inside the gas chromatograph through an electronic control valve, and the second connecting pipe corresponds to the first connecting pipe; a separator is provided inside the metal cylinder, which is used to separate different detection samples.

2. The specialized testing equipment for the alcohol resistance performance of biomass methanol fuel engine oil according to claim 1, characterized in that: The separation assembly includes a first separation plate, a double-hole plate, a second separation plate, and a first solenoid valve; the first separation plate is fixed inside the metal cylinder; the double-hole plate is fixed to the bottom end of the sealing cover plate; the two second separation plates are fixed between the sealing cover plate and the double-hole plate; and the first solenoid valve is fixed to the second separation plate.

3. The specialized testing equipment for the alcohol resistance performance of biomass methanol fuel engine oil according to claim 2, characterized in that: A three-way block is fixed between the electronic control valve on the gas chromatograph transmission line and the second connecting pipe; a second solenoid valve is fixed to the three-way block; and a multi-way pipe is fixed to the second solenoid valve.

4. The dedicated testing equipment for the alcohol resistance performance of biomass methanol fuel engine oil according to claim 3, characterized in that: The end of the multi-port pipe furthest from the second solenoid valve is fixedly connected to a liquid storage tank, which is also fixedly connected inside the gas chromatograph. A water pump is fixedly connected to the liquid storage tank, and the output end of the water pump is connected to the multi-port pipe. The input end of the water pump is located inside the liquid storage tank. A refrigerator is fixedly connected inside the liquid storage tank. A condenser tube is fixedly connected to the output end of the refrigerator.

5. A special testing device for the alcohol resistance performance of biomass methanol fuel engine oil according to claim 4, characterized in that: A sealing plate is fixed between the two No. 2 partition plates, and the sealing plate is located above the center of the double-hole plate; a funnel groove is opened on the upper surface of the sealing plate, and a No. 3 solenoid valve is fixed at the bottom of the funnel groove.

6. The dedicated testing equipment for the alcohol resistance performance of biomass methanol fuel engine oil according to claim 1, characterized in that: The pusher plate has three heat-conducting plates fixed inside, and the heat-conducting plates are located on one side of the metal cylinder; one end of each heat-conducting plate is fixed with a heat-conducting ring, and the heat-conducting ring is sleeved on the outside of the metal cylinder.

7. A special testing device for the alcohol resistance performance of biomass methanol fuel engine oil according to claim 6, characterized in that: A first heat-conducting block is fixedly attached to the heat-conducting plate; a heat-concentrating cylinder is fixedly attached to the second connecting pipe; a second heat-conducting block is fixedly attached to the bottom end of the heat-concentrating cylinder, and the second heat-conducting block corresponds to the first heat-conducting block.

8. A special testing device for the alcohol resistance performance of biomass methanol fuel engine oil according to claim 3, characterized in that: A telescopic tube is fixedly connected to the carrier gas delivery tube inside the gas chromatograph, and the other end of the telescopic tube is fixedly connected to the pressure plate; a gas guide tube is fixedly connected inside the pressure plate and the sealing cover plate; a one-way valve is fixedly connected to one end of the gas guide tube near the first connecting tube, and the telescopic tube can be connected to the pressure plate, the gas guide tube, the one-way valve and the first connecting tube.

9. A special testing device for the alcohol resistance performance of biomass methanol fuel engine oil according to claim 4, characterized in that: The liquid storage tank is internally fixed with a water collection box, and a sedimentation tank is provided in the middle of the water collection box; a first filter layer and a second filter layer are fixedly connected from bottom to top in the sedimentation tank of the water collection box, and the input end of the water pump is located below the first filter layer.

10. A special testing device for the alcohol resistance performance of biomass methanol fuel engine oil according to claim 4, characterized in that: The bottom of the condenser tube is fixedly connected to a metal bend, and multiple metal bends are provided; multiple guide plates are fixedly connected to the inside of the liquid storage tank near the metal bends, and the multiple guide plates are inclined.

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