An engine bench test oil sampling device

Abstract

The present invention relates to the technical field of engine fault detection, and in particular to an engine bench test oil sampling device. The device comprises: a weighing unit, which comprises an oil weighing barrel, and the oil weighing barrel is connected to the oil pan pipeline to transfer the oil in the oil pan to the oil weighing barrel; a sampling unit, which comprises a sampling bottle, a sampling oil pump and a sampling solenoid valve, and the sampling bottle, the sampling oil pump and the oil weighing barrel pipeline are connected to obtain sampled oil, and the sampling bottle, the sampling oil pump and the oil weighing barrel form a sampling circulation loop, or the sampling bottle, the sampling oil pump, the oil weighing barrel and the oil pan form a sampling circulation loop. The sampling bottle, the sampling oil pump and the oil weighing barrel pipeline are connected to obtain sampled oil, which can prevent the accuracy of the physical and chemical test of the oil from being affected by the dead zone oil, and can also prevent frequent shutdown of the bench test due to sampling.

Description

Technical Field

[0001] The invention relates to the technical field of engine fault detection, and in particular to an engine bench test oil sampling device. Background Art

[0002] The engine oil needs to be monitored during the engine bench test. Currently, some engine bench tests that specifically assess the performance of lubricating oil also require regular sampling and testing of the engine oil. The engine oil test items include engine oil viscosity, total base number, total acid number, oxidation number, nitration number, soot content, fuel dilution, engine oil additive elements, and engine parts wear elements. Sampling and testing of engine oil can effectively reflect the operating status of the engine and oil, and play an important role in the performance evaluation of the engine and oil.

[0003] However, there are some problems with oil sampling during bench tests. First, there is no bench test with a special oil sampling device. When taking oil samples, the engine needs to be shut down, the oil pan drain bolts need to be removed, or the pressure tube of the main oil channel pressure sensor of the engine body needs to be removed for sampling. This has the disadvantages of inaccurate sampling volume and inability to ensure sample uniformity, resulting in frequent interruptions of engine bench tests and complicated operations. Second, the engine bench test can be connected to an oil external circulation device for oil sampling, but there is dead oil in the oil sampling pipeline. The dead oil needs to be drained first, and then poured back into the engine oil circulation system before sampling. The amount of dead oil released is difficult to fix in actual operation. If the amount of dead oil is not enough, the sampling result will deviate from the actual oil result, affecting the accuracy of the physical and chemical test of the test oil. At the same time, it is dangerous to manually go to the operating bench laboratory for sampling.

[0004] Therefore, there is an urgent need for an engine bench test oil sampling device to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide an engine bench test oil sampling device, which can sample the oil in a flowing state and ensure the accuracy of physical and chemical testing of the oil.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Provided is an engine bench test oil sampling device, comprising:

[0008] A weighing unit, comprising an oil weighing barrel, the oil weighing barrel being connected to an oil pan pipeline for transferring the oil in the oil pan to the oil weighing barrel;

[0009] A sampling unit comprises a sampling bottle, a sampling oil pump and a sampling solenoid valve. The sampling bottle and the sampling oil pump are connected to the oil weighing barrel pipeline to obtain sampled oil. The sampling bottle, the sampling oil pump and the oil weighing barrel form a sampling circulation loop, or the sampling bottle, the sampling oil pump, the oil weighing barrel and the oil pan form a sampling circulation loop.

[0010] As an optimal technical solution of the above-mentioned engine bench test oil sampling device, the sampling solenoid valve is a three-way valve, the three-way valve is located at the top of the sampling bottle, the first channel of the three-way valve is connected to the bottle mouth of the sampling bottle, the second channel of the three-way valve is connected to the oil outlet of the oil weighing barrel, the third channel of the three-way valve is connected to the oil inlet of the oil weighing barrel or the oil pan inlet hole of the oil pan, and the three-way valve selectively connects the first channel and the second channel or the second channel and the third channel.

[0011] As an optimal technical solution of the above-mentioned engine bench test oil sampling device, the oil outlet is connected to the three-way valve through the sampling oil pump, the oil pan oil inlet and the oil outlet are connected through a first oil pump, and the oil inlet and the oil pan oil outlet of the oil pan are connected through a second oil pump.

[0012] As an optimal technical solution of the above-mentioned engine bench test oil sampling device, the oil outlet is connected to the second channel of the three-way valve through the sampling oil pump, the third channel of the three-way valve is connected to the oil inlet hole of the oil pan, and the oil inlet is connected to the oil outlet hole of the oil pan through a second oil pump.

[0013] As a preferred technical solution of the above-mentioned engine bench test oil sampling device, the sampling bottle and the three-way valve are connected via a conversion joint cover, and the conversion joint cover is threadedly connected to the sampling bottle and the three-way valve respectively.

[0014] As a preferred technical solution of the above-mentioned engine bench test oil sampling device, a vent hole is provided on the conversion joint cover.

[0015] As an optimal technical solution of the above-mentioned engine bench test oil sampling device, the solenoid valve is a two-way valve, the oil outlet of the oil weighing barrel is connected to the sampling bottle through the sampling oil pump, the sampling bottle is connected to the oil return port of the oil weighing barrel through the oil return pump, the oil pan oil inlet hole and the oil outlet of the oil pan are connected through a first oil pump, and the oil inlet of the oil weighing barrel and the oil pan oil outlet hole of the oil pan are connected through a second oil pump.

[0016] As a preferred technical solution of the above-mentioned engine bench test oil sampling device, the weighing unit also includes a weighing bracket for supporting the oil weighing barrel.

[0017] As a preferred technical solution of the above-mentioned engine bench test oil sampling device, the bottom of the oil weighing barrel is a conical structure.

[0018] As a preferred technical solution of the above-mentioned engine bench test oil sampling device, the engine bench test oil sampling device also includes a controller, and the controller is electrically connected to the sampling solenoid valve and the sampling oil pump respectively.

[0019] Beneficial effects of the present invention:

[0020] The engine bench test oil sampling device provided in the present invention has a sampling bottle, a sampling oil pump and an oil weighing barrel connected by a pipeline to obtain sampled oil, and the sampling bottle, the sampling oil pump and the oil weighing barrel form a sampling circulation loop, or the sampling bottle, the sampling oil pump, the oil weighing barrel and the oil pan form a sampling circulation loop. The sampling bottle takes samples during the oil circulation process, which can prevent the accuracy of the physical and chemical test of the oil from being affected by the dead zone oil, and can also prevent the bench test from being frequently shut down due to sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an engine oil sampling device for an engine bench test provided in Embodiment 1 of the present invention;

[0022] Figure 2 is a schematic structural diagram of a conversion joint cover provided by an embodiment of the present invention;

[0023] Figure 3 It is a structural schematic diagram of an engine oil sampling device for an engine bench test provided by a second embodiment of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the engine bench test oil sampling device provided in Example 3 of the present invention.

[0025] In the figure:

[0026] 1. Engine oil weighing barrel; 2. Weighing bracket; 3. Sampling bottle; 4. Sampling oil pump; 5. Sampling solenoid valve; 51. First channel; 52. Second channel; 53. Third channel; 6. First oil pump; 7. Second oil pump; 8. Conversion joint cover; 81. Air vent; 82. External threaded column; 9. Oil return pump; 10. Controller; 11. Weight display; 100. Oil pan; 101. Oil inlet hole of oil pan; 102. Oil outlet hole of oil pan. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] Embodiment 1

[0032] The present embodiment provides an engine bench test oil sampling device, which can directly sample the oil during its flow, thereby preventing the accuracy of the physical and chemical test of the oil from being affected by dead zone oil.

[0033] like Figure 1As shown, the engine bench test oil sampling device includes a load-bearing unit and a sampling unit, wherein the weighing unit includes an oil weighing barrel 1, which is connected to the oil pan 100 by a pipeline to transfer the oil in the oil pan 100 to the oil weighing barrel 1; the sampling unit includes a sampling bottle 3, a sampling oil pump 4 and a sampling solenoid valve 5, and the sampling bottle 3, the sampling oil pump 4 and the oil weighing barrel 1 are connected to the pipeline to obtain the sampled oil, and the sampling bottle 3, the sampling oil pump 4 and the oil weighing barrel 1 form a sampling circulation loop, or the sampling bottle 3, the sampling oil pump 4, the oil weighing barrel 1 and the oil pan 100 form a sampling circulation loop.

[0034] In the engine bench test oil sampling device provided in this embodiment, the sampling bottle 3, the sampling oil pump 4 are connected to the oil weighing barrel 1 through a pipeline to obtain the sampled oil. The sampling bottle 3, the sampling oil pump 4 and the oil weighing barrel 1 form a sampling circulation loop, or the sampling bottle 3, the sampling oil pump 4, the oil weighing barrel 1 and the oil pan 100 form a sampling circulation loop. The sampling bottle 3 takes samples during the oil circulation process, which can prevent the accuracy of the physical and chemical test of the oil from being affected by the dead zone oil, and can also prevent the bench test from being frequently shut down due to sampling. At the same time, the sampling unit and the load-bearing unit are connected through a pipeline, so the sampling bottle 3 in the sampling unit can be set outside the bench test room, thereby reducing the time for the sampling personnel to enter the running bench test room.

[0035] Preferably, the two sampling solenoid valves 5 of this embodiment are three-way valves, wherein the three-way valve is located at the top of the sampling bottle 3 so that the oil can flow into the sampling bottle 3 by gravity, and dead zone oil is prevented from forming in the three-way valve. Further, the first channel 51 of the three-way valve in this embodiment is connected with the bottle mouth of the sampling bottle 3, and specifically, the extension direction of the first channel 51 overlaps with the height direction of the sampling bottle 3, so that the oil can flow into the sampling bottle 3. The second channel 52 of the three-way valve is connected with the oil outlet of the oil weighing barrel 1, and the third channel 53 of the three-way valve is connected with the oil inlet of the oil weighing barrel 1 or the oil inlet hole 101 of the oil pan 100. The three-way valve selectively connects the first channel 51 and the second channel 52 or the second channel 52 and the third channel 53. When the engine oil needs to be sampled, the first channel 51 and the second channel 52 of the three-way valve are connected to allow the engine oil to flow into the sampling bottle 3. At this time, the third channel 53 is in a blocked state. When the engine oil is not sampled, the second channel 52 and the third channel 53 of the three-way valve are connected, and the first channel 51 is in a blocked state to ensure that the engine oil is in a flowing state and prevent the formation of dead zone oil in the three-way valve.

[0036] Preferably, in this embodiment, the oil outlet is connected to the three-way valve through a sampling oil pump 4, and the sampling oil pump 4 provides power so that the oil can enter the three-way valve. The oil inlet hole 101 of the oil pan and the oil outlet are connected through the first oil pump 6, and the oil inlet is connected to the oil pan outlet hole 102 of the oil pan 100 through the second oil pump 7. The functions of the first oil pump 6 and the second oil pump 7 are the same as those of the sampling oil pump 4, which can provide power for the oil flow so that the oil will not stagnate and dead oil will not appear in various places of the engine bench test oil sampling device. The first oil pump 6 and the second oil pump 7 are powered by different motors, and the pumping rate of the second oil pump 7 should be greater than the pumping rate of the first oil pump 6. Thereby ensuring that the oil pan liquid level remains stable during the operation of the engine, that is, the oil pan oil level remains near the lower end point of the oil pan inlet hole 101.

[0037] Preferably, in this embodiment, the sampling bottle 3 is connected to the three-way valve via a conversion joint cover 8, such as Figure 2 As shown, the conversion joint cover 8 is threadedly connected to the sampling bottle 3 and the three-way valve respectively. The top of the conversion joint cover 8 is provided with an external thread column 82, which is threadedly connected to the internal thread of the three-way valve; and the inner circle of the conversion joint cover 8 is provided with an internal thread, which is threadedly connected to the external thread of the sampling bottle 3. In order to allow the engine oil to flow smoothly into the sampling bottle 3, a vent hole 81 is provided on the conversion joint cover 8 in this embodiment.

[0038] Preferably, in this embodiment, the weighing unit further comprises a weighing bracket 2 for supporting the engine oil weighing barrel 1. The weighing bracket 2 provides support for the engine oil weighing barrel 1, so that the engine oil outlet provided in the engine oil weighing barrel 1 is connected with other components. Preferably, in order to facilitate the engine oil to flow out of the engine oil weighing barrel 1, the bottom of the engine oil weighing barrel 1 is a conical structure.

[0039] Preferably, a weight display 11 is provided at the bottom of the engine oil weighing barrel 1 to facilitate the test personnel to read the data.

[0040] In this embodiment, the engine bench test oil sampling device further includes a controller 10, which is electrically connected to the sampling solenoid valve 5 and the sampling oil pump 4. Of course, the controller 10 is also electrically connected to the first oil pump 6 and the second oil pump 7, and controls each oil pump to work in an orderly manner.

[0041] The sampling bottle 3 is made of PP (high temperature resistant) material, with a volume of 250ml, and the oil inlet and outlet oil pipes are made of Teflon hose, with an inner diameter of 9.5mm and a wall thickness of 1.5mm. The pumping flow rate of the sampling oil pump 4 can be 3L / min±0.5L.

[0042] The oil in the engine oil pan 100 is introduced into the oil weighing barrel 1 through the oil pan oil outlet hole 102. The position of the oil pan oil outlet hole 102 should be appropriately selected to ensure that during the operation of the engine, the lowest position of the oil vortex in the oil pan 100 when the engine oil suction pan sucks oil is higher than the position of the oil suction pan, that is, the actual liquid level of the oil must ensure that the oil can be stably sucked from the engine oil suction pan without sucking in air.

[0043] All the oil between the oil outlet hole 102 of the oil pan and the initial liquid level of the engine oil pan 100 is transported to the oil weighing barrel 1 by the second oil pump, so the oil inside the engine will remain constant. The amount of oil in the oil weighing barrel 1 will change with the consumption of oil in the engine bench test, so the weighing bracket 2 of the oil weighing barrel 1 can effectively and dynamically monitor the change of the oil amount in the bench test.

[0044] The first oil pump 6 is connected to the pipeline to extract the oil from the lowest point at the bottom center of the oil weighing barrel 1, that is, the oil outlet. The upper end point of the oil pan oil inlet hole 101 is more than 5 cm lower than the upper end point of the oil pan oil outlet hole 102 in vertical distance. The distance between the center point of the oil pan oil inlet hole 101 and the center point of the oil pan oil outlet hole 102 is not less than 15 cm to prevent the interference of the inlet and return oil. The inner diameter of the oil pipe of the oil pan oil outlet hole 102 should be larger than the inner diameter of the oil pipe of the oil pan oil inlet hole 101, so as to ensure that the actual liquid level of the oil pan 100 is stable and the oil in the oil weighing barrel 1 does not overflow.

[0045] The capacity of the engine oil weighing barrel 1 is 10L-13L, the inner diameter is 15cm, the barrel bottom taper is 3, and the material is stainless steel, which can meet the bench test requirements of light engines to heavy engines. The inner diameter of the oil pipe of the oil pan oil outlet hole 102 is 13mm, and the inner diameter of the oil pan oil inlet hole 101 is 10mm. The oil pipe connected to the oil pan oil inlet hole 101 and the oil pan oil outlet hole 102 is made of Teflon steel wire hose, and the joint is made of stainless steel.

[0046] During sampling, the sampling oil pump 4 extracts part of the oil from the outlet pipe at the lower end of the oil weighing barrel 1 and flows back to the inlet at the upper end of the oil weighing barrel 1 through the sampling solenoid valve 5. The valve port at the lower end of the sampling solenoid valve 5 (i.e., the first channel 51) is directly connected to the conversion joint cover 8 that matches the thread of the sampling bottle 3. The sampling bottle 3 can be directly installed and tightened on the conversion joint cover 8. The upper end of the conversion joint cover 8 has a vent 81. When the engine bench test is running, the sampling oil pump 4 starts to run, and the oil also flows continuously in the sampling unit pipeline without dead zone oil. At this time, the sampling solenoid valve 5, the second channel 52 and the third channel 53 are open, and the first channel 51 is closed; when oil sampling is required, the sampling solenoid valve 5 is controlled by the controller 10 to open the first channel 51 and the second channel 52 and close the third channel 53. The engine oil directly flows into the sampling bottle 3. After the sampling is completed, the controller 10 controls the second channel 52 and the third channel 53 of the sampling solenoid valve 5 to open and the first channel 51 to close. At this time, the sampling is completed.

[0047] It should be noted that the sampling solenoid valve 5 and the sampling bottle 3 can be fixed outside the laboratory to ensure the safety of personnel. After the sampling is completed, the test personnel remove the sampling bottle 3, cover the bottle cap and label it to complete the sampling work, and replace the automatic sampler with a new sampling bottle 3. The sampling process does not require the operation of removing dead zone oil and pouring back dead zone oil. The sampling method is scientific and effective, and the sample is in a flowing state, uniform and representative.

[0048] Embodiment 2

[0049] This embodiment is different from the first embodiment in that:

[0050] like Figure 3 As shown, the engine oil outlet is connected to the second channel 52 of the three-way valve through the sampling oil pump 4, the third channel 53 of the three-way valve is connected to the oil pan oil inlet 101, and the engine oil inlet is connected to the oil pan oil outlet 102 of the oil pan 100 through the second oil pump 7.

[0051] The controller 10 is connected to the sampling solenoid valve 5, the sampling oil pump 4 and the second oil pump 7 respectively. The sampling oil pump 4 can realize the oil flow back to the oil pan 100 and provide power for the oil entering the sampling bottle 3. Compared with the first embodiment, the structure is simpler. However, the sampling bottle 3 requires the test personnel to enter the test room to take it out.

[0052] Embodiment 3

[0053] like Figure 4As shown, the engine bench test oil sampling device includes a load-bearing unit and a sampling unit, wherein the weighing unit includes an oil weighing barrel 1, which is connected to the oil pan 100 by a pipeline to transfer the oil in the oil pan 100 to the oil weighing barrel 1; the sampling unit includes a sampling bottle 3, a sampling oil pump 4 and a sampling solenoid valve 5, and the sampling bottle 3, the sampling oil pump 4 and the oil weighing barrel 1 are connected to the pipeline to obtain the sampled oil, and the sampling bottle 3, the sampling oil pump 4 and the oil weighing barrel 1 form a sampling circulation loop, or the sampling bottle 3, the sampling oil pump 4, the oil weighing barrel 1 and the oil pan 100 form a sampling circulation loop.

[0054] In the engine bench test oil sampling device provided in this embodiment, the sampling bottle 3, the sampling oil pump 4 are connected to the oil weighing barrel 1 through a pipeline to obtain the sampled oil. The sampling bottle 3, the sampling oil pump 4 and the oil weighing barrel 1 form a sampling circulation loop, or the sampling bottle 3, the sampling oil pump 4, the oil weighing barrel 1 and the oil pan 100 form a sampling circulation loop. The sampling bottle 3 takes samples during the oil circulation process, which can prevent the accuracy of the physical and chemical test of the oil from being affected by the dead zone oil, and can also prevent the bench test from being frequently shut down due to sampling. At the same time, the sampling unit and the load-bearing unit are connected through a pipeline, so the sampling bottle 3 in the sampling unit can be set outside the bench test room, thereby reducing the time for the sampling personnel to enter the running bench test room.

[0055] In the present embodiment, the sampling solenoid valve 5 is a two-way valve, the oil outlet of the oil weighing barrel 1 is connected to the sampling bottle 3 through the sampling oil pump 4, and the sampling bottle 3 is connected to the oil return port of the oil weighing barrel 1 through the return oil pump 9, wherein the oil inlet pipe mouth connected to the sampling oil pump 4 is located at the bottom of the sampling bottle 3, and the return oil pipe mouth connected to the return oil pump 9 is located at the upper part of the sampling bottle 3, and the bottle cap of the sampling bottle 3 is provided with an air vent 81 through which the oil enters the sampling bottle 3, the oil pan oil inlet hole 101 of the oil pan 100 and the oil outlet are connected through the first oil pump 6, and the oil inlet port of the oil weighing barrel 1 is connected to the oil pan oil outlet hole 102 of the oil pan 100 through the second oil pump 7.

[0056] In this embodiment, the engine bench test oil sampling device also includes a controller 10, which is electrically connected to the sampling solenoid valve 5, the sampling oil pump 4 and the return oil pump 9, the first oil pump 6 and the second oil pump 7, respectively, to control each oil pump to work in an orderly manner.

[0057] The length of the return oil pipe is smaller than that of the inlet pipe, the inlet pipe opening is located at the bottom of the sampling bottle 3, and the return oil pipe opening is located at the upper part of the sampling bottle 3, both of which are located inside the sampling bottle 3, and both of which ensure that the oil in the sampling bottle 3 maintains dynamic flow and that the oil in the sampling bottle 3 does not overflow. After the sampling is completed, the controller 10 controls the sampling solenoid valve 5 and the sampling oil pump 4 to close, and the sampling bottle 1 can be taken out, covered with a lid, and labeled to complete the sampling. Finally, replace the new sampling bottle 1 and screw it onto the conversion joint cover 8, and open the sampling solenoid valve 5 and the sampling oil pump 4 oil pump through the controller 10.

[0058] Preferably, in this embodiment, the weighing unit further comprises a weighing bracket 2 for supporting the engine oil weighing barrel 1. The weighing bracket 2 provides support for the engine oil weighing barrel 1, so that the engine oil outlet provided in the engine oil weighing barrel 1 is connected with other components. Preferably, in order to facilitate the engine oil to flow out of the engine oil weighing barrel 1, the bottom of the engine oil weighing barrel 1 is a conical structure.

[0059] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An engine bench test oil sampling device, characterized in that: include: A weighing unit, comprising an engine oil weighing barrel (1), the engine oil weighing barrel (1) being connected to an oil pan (100) pipeline for transferring the engine oil in the oil pan (100) to the engine oil weighing barrel (1); A sampling unit, comprising a sampling bottle (3), a sampling oil pump (4) and a sampling solenoid valve (5); the sampling bottle (3), the sampling oil pump (4) and the engine oil weighing barrel (1) are connected by pipeline to obtain sampled engine oil; the sampling bottle (3), the sampling oil pump (4) and the engine oil weighing barrel (1) form a sampling circulation loop, or the sampling bottle (3), the sampling oil pump (4), the engine oil weighing barrel (1) and the oil pan (100) form a sampling circulation loop. The sampling solenoid valve (5) is a three-way valve, which is located at the top of the sampling bottle (3). The first channel (51) of the three-way valve is connected to the bottle mouth of the sampling bottle (3), the second channel (52) of the three-way valve is connected to the oil outlet of the oil weighing barrel (1), and the third channel (53) of the three-way valve is connected to the oil inlet of the oil weighing barrel (1) or the oil pan oil inlet hole (101) of the oil pan (100). The three-way valve selectively connects the first channel (51) and the second channel (52) or the second channel (52) and the third channel (53). The engine oil outlet is connected to the three-way valve via the sampling oil pump (4), the oil sump oil inlet (101) and the engine oil outlet are connected via a first oil pump (6), and the engine oil inlet is connected to the oil sump oil outlet (102) of the oil sump (100) via a second oil pump (7). The engine oil outlet is in communication with the second channel (52) of the three-way valve via the sampling oil pump (4), the third channel (53) of the three-way valve is in communication with the oil sump oil inlet (101), and the engine oil inlet is in communication with the oil sump oil outlet (102) of the oil sump (100) via a second oil pump (7); The bottom of the engine oil weighing barrel (1) is a conical structure.

2. The engine bench test oil sampling device according to claim 1, characterized in that: The sampling bottle (3) and the three-way valve are connected via a conversion joint cover (8), and the conversion joint cover (8) is threadedly connected to the sampling bottle (3) and the three-way valve respectively.

3. The engine bench test oil sampling device according to claim 2, characterized in that: The conversion joint cover (8) is provided with a vent hole (81).

4. The engine bench test oil sampling device according to claim 1, characterized in that: The sampling solenoid valve (5) is a two-way valve; the oil outlet of the oil weighing barrel (1) is connected to the sampling bottle (3) through the sampling oil pump (4) and the sampling solenoid valve (5); the sampling bottle (3) is connected to the oil return port of the oil weighing barrel (1) through the oil return pump (9); the oil pan oil inlet (101) of the oil pan (100) and the oil outlet are connected through the first oil pump (6); the oil inlet of the oil weighing barrel (1) and the oil pan oil outlet (102) of the oil pan (100) are connected through the second oil pump (7).

5. The engine bench test oil sampling device according to claim 1, characterized in that: The weighing unit further comprises a weighing bracket (2) for supporting the engine oil weighing barrel (1).

6. The engine bench test oil sampling device according to claim 1, characterized in that: The engine bench test oil sampling device further comprises a controller (10), wherein the controller (10) is electrically connected to the sampling solenoid valve (5) and the sampling oil pump (4), respectively.

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