Hydraulic oil shear stability evaluation device

Abstract

The utility model belongs to the technical field of hydraulic oil product performance evaluation equipment, and particularly relates to a hydraulic oil shearing stability evaluation device which comprises a hydraulic oil tank, a shearing module and a sampling module. And an oil outlet path is connected between the oil outlet end of the shearing module and the hydraulic oil tank. The testing principle of the shearing stability is that the hydraulic oil sample is circularly sheared within the testing time, and the viscosity of the hydraulic oil sample is measured after the testing time is up. According to the hydraulic oil shear stability evaluation device, the hydraulic oil tank, the oil inlet oil way, the shearing unit and the oil outlet oil way form the hydraulic oil way, in other words, the evaluation process of the shear stability is directly conducted in the hydraulic oil way, running-in of components for testing is not needed, and it can be seen that the test efficiency is greatly improved. And the test period of the shear stability is obviously shortened so as to realize rapid judgment of the shear stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic oil product performance evaluation equipment, and particularly relates to a hydraulic oil shear stability evaluation device. BACKGROUND

[0002] Viscosity is one of important indexes for evaluating the use performance of hydraulic oil. If the viscosity of oil is too low, the hydraulic system equipment will leak and the wear will increase, and the volumetric efficiency will decrease. If the viscosity of oil is too high, the hydraulic system equipment will have difficulty in starting at low temperature, causing cavitation. Shear stability is the ability of hydraulic oil to resist shear and keep the viscosity and viscosity-related properties unchanged. In other words, the shear stability of hydraulic oil is one of key physical and chemical properties of hydraulic oil.

[0003] In the prior art, the conical roller bearing shear determination method is used to evaluate the shear stability of hydraulic oil. According to the above related technology, the conical roller bearing shear determination method has high requirements for bearing running-in, and the running-in process is long, resulting in a long test period. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the application is to provide a hydraulic oil shear stability evaluation device, which can quickly judge the shear stability of hydraulic oil.

[0005] In order to achieve the above purpose, the application provides a hydraulic oil shear stability evaluation device, which comprises:

[0006] A hydraulic oil tank containing hydraulic oil samples;

[0007] A shear module, an oil inlet oil path being connected between the oil inlet end of the shear module and the hydraulic oil tank, an oil outlet oil path being connected between the oil outlet end of the shear module and the hydraulic oil tank, and the shear module comprising a plurality of shear units;

[0008] A sampling module connected with the oil outlet oil path and used for sampling the hydraulic oil samples.

[0009] In some embodiments, the plurality of shear units are arranged in series.

[0010] In some embodiments, the shear opening of one of the shear units arranged relatively close to the oil inlet oil path is greater than that of the other one arranged relatively close to the oil outlet oil path.

[0011] In some embodiments, the plurality of shear units are arranged in parallel.

[0012] In some embodiments, the number of shear units is at least three, and the plurality of shear units are arranged in a mixed manner.

[0013] In some embodiments, the shearing unit comprises a shearing oil path and an opening adjusting member arranged on the shearing oil path, the opening adjusting member being used to adjust the size of the cross-sectional passage of the shearing oil path.

[0014] In some embodiments, the opening adjusting member comprises a stop valve.

[0015] In some embodiments, the opening adjusting member comprises a steel plate with a shearing hole.

[0016] In some embodiments, the sampling module comprises a sampling oil path and a sampling valve arranged on the sampling oil path, the oil inlet end of the sampling oil path being connected with the oil outlet oil path, and the oil outlet end of the sampling oil path being open.

[0017] In some embodiments, the hydraulic oil tank is provided with a thermometer.

[0018] In some embodiments, the hydraulic oil tank is provided with an air filter.

[0019] In some embodiments, the oil inlet oil path is provided with a motor oil pump set.

[0020] In some embodiments, the oil inlet oil path is provided with an overflow valve.

[0021] By means of the above technical solution, the hydraulic oil shearing stability evaluation device provided by the present application has the following advantages

[0022] Advantages:

[0023] The evaluation principle of the shearing stability is to perform cyclic shearing on the hydraulic oil sample within a test time, to measure the viscosity of the hydraulic oil sample after reaching the test time, to repeatedly measure for several test times, to stop repeating when the percentage of the measured viscosity reaches a preset percentage, and to record the total time required for the viscosity to decrease by 10%, and to evaluate the shearing stability of the hydraulic oil sample according to the total time. In the present application, the hydraulic oil shearing stability evaluation device comprises a hydraulic oil tank, an oil inlet oil path, a shearing unit and an oil outlet oil path to form a hydraulic oil path, in other words, the evaluation process of the shearing stability is directly performed in the hydraulic oil path, without the need for the running-in of the test components, and therefore the test cycle of the shearing stability is significantly shortened to realize the rapid evaluation of the shearing stability.

[0024] Other features and advantages of the embodiments of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0026] Fig. 1 This is a schematic diagram of the hydraulic oil shear stability evaluation device according to the first embodiment of this application;

[0027] Fig. 2 This is a schematic diagram of the hydraulic oil shear stability evaluation device according to the second embodiment of this application;

[0028] Fig. 3 This is a schematic diagram of the hydraulic oil shear stability evaluation device according to the third embodiment of this application.

[0029] Explanation of reference numerals in the attached figures

[0030] 100. Hydraulic oil shear stability evaluation device; 1. Hydraulic oil tank; 2. Oil inlet circuit; 3. Shearing module; 4. Oil outlet circuit; 5. Sampling valve; 6. Sampling circuit; 7. Thermometer; 8. Air filter; 9. Motor oil pump set; 10. Relief valve. Detailed Implementation

[0031] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0032] The terminology of the hydraulic oil shear stability evaluation device 100 according to this application is described below with reference to the accompanying drawings.

[0033] Viscosity: The resistance a fluid exhibits to flow. Viscosity is one of the important indicators for evaluating the performance of hydraulic oil. If the oil viscosity is too low, it will cause increased leakage and wear in hydraulic system equipment, and reduce volumetric efficiency. If the oil viscosity is too high, it will make it difficult for hydraulic system equipment to start at low temperatures and cause cavitation.

[0034] Viscosity index: The degree to which a fluid's viscosity changes with temperature. Fluids with a high viscosity index exhibit a greater degree of viscosity change with temperature, while fluids with a low viscosity index show a smaller degree of viscosity change. During the evaluation of shear stability, the fluid's temperature changes. For fluids with a high viscosity index, the accuracy of the shear stability assessment is easily affected by temperature. In other words, the shear stability assessment of fluids with a high viscosity index needs to be completed quickly.

[0035] Shear stability: The ability of a petroleum product to resist shear and maintain its viscosity and viscosity-related properties.

[0036] like Figs. 1 to 3 As shown in the figure, a specific embodiment of this application provides a hydraulic oil shear stability evaluation device 100, including a hydraulic oil tank 1, a shearing module 3, and a sampling module. The hydraulic oil tank 1 contains a hydraulic oil sample. The oil inlet end of the shearing module 3 is connected to the hydraulic oil tank 1 by an oil inlet passage 2, and the oil outlet end of the shearing module 3 is connected to the hydraulic oil tank 1 by an oil outlet passage 4. The shearing module 3 includes multiple shearing units. The sampling module is connected to the oil outlet passage 4 and is used to sample the hydraulic oil sample.

[0037] Shear stability is one of the key physicochemical properties of hydraulic oil. Hydraulic oil is subjected to shearing as it passes through multiple valves and components in a hydraulic system. This shearing disrupts the oil's macromolecular chains, leading to a decrease in viscosity. Excessively low viscosity can cause leaks, increased wear, and reduced volumetric efficiency in the hydraulic system. Therefore, shear stability must be evaluated before hydraulic oil leaves the factory. In this application, the hydraulic oil sample flows from the hydraulic oil tank 1 through the inlet oil line 2 into multiple shearing units to complete the shearing process, and then flows back to the hydraulic oil tank 1 through the outlet oil line 4. Furthermore, the viscosity of the hydraulic oil is measured by a sampling module after the test time has elapsed. In other words, the shear stability test of the hydraulic oil is completed within the hydraulic circuit consisting of the hydraulic oil tank 1, the inlet oil line 2, the shearing units, and the outlet oil line 4, without the need for preheating or break-in of the testing equipment. This significantly shortens the testing cycle for the shear stability of the hydraulic oil, thus enabling rapid evaluation of the shear stability of the hydraulic oil sample.

[0038] Furthermore, the application environment of hydraulic oil is the hydraulic system. In this application, the evaluation process of the shear stability of hydraulic oil is directly completed in the hydraulic circuit consisting of hydraulic oil tank 1, oil inlet circuit 2, shear unit and oil outlet circuit 4, which is conducive to simulating the viscosity change of hydraulic oil in the actual application environment, and thus makes the test results more consistent with the actual application.

[0039] It should be noted that, in the specific embodiments of this application, the hydraulic oil tank 1 includes an oil outlet and an oil return port. The oil inlet passage 2 is connected to the oil outlet of the hydraulic oil tank 1, and the oil outlet passage 4 is connected to the oil return port of the hydraulic oil tank 1. The side relatively closer to the oil outlet along the flow direction of the hydraulic oil sample is the "upstream side", and the side relatively closer to the oil return port along the flow direction of the hydraulic oil sample is the "downstream side".

[0040] In some implementations, at least two shearing units have different shearing openings.

[0041] In reality, the shearing degree of each valve and hydraulic component in a hydraulic system is different. In other words, the shearing opening degree of each valve and hydraulic component is different, and different shearing opening degrees will lead to different degrees of viscosity reduction. In this application, multiple shearing units with different shear opening degrees are set to simulate different valves and hydraulic components in a hydraulic system, so that the test results are more in line with the actual situation.

[0042] like Fig. 1 As shown, in the first embodiment, multiple shearing units are arranged in series.

[0043] Specifically, after being sheared by a single shearing unit, the viscosity of the hydraulic oil sample decreases very little, or even undetectably. In other words, a large number of cycles are required during the test to achieve a viscosity reduction until the viscosity reduction percentage reaches a preset percentage. However, this increased number of cycles leads to a longer test cycle. In this application, multiple shearing units arranged in series are used to increase the number of times the hydraulic oil sample is sheared in a single cycle, i.e., to increase the shearing frequency. This reduces the number of cycles during the test, thereby shortening the test cycle and enabling rapid determination of the shear stability of the hydraulic oil sample.

[0044] Furthermore, in any two shearing units, the one relatively closer to the inlet oil passage 2 has a greater shear opening than the one relatively closer to the outlet oil passage 4. That is, the shearing unit with a larger shear opening is located upstream of the shearing unit with a smaller shear opening. The shearing unit with a smaller shear opening exerts a greater degree of shearing on the hydraulic oil sample, while the shearing unit with a larger shear opening exerts a lesser degree of shearing on the hydraulic oil sample. In this application, by arranging all shearing units in series sequentially according to their shear opening from largest to smallest, the degree of shearing on the hydraulic oil sample is arranged from smallest to largest, thereby maximizing the shearing effect of each shearing unit and further shortening the test cycle.

[0045] like Fig. 2 As shown, in the second embodiment, multiple shearing units are arranged in parallel with each other.

[0046] Specifically, after being sheared by a single shearing unit, the viscosity of the hydraulic oil sample decreases very little, or even undetectably. In other words, a large number of cycles are required during the test to achieve a viscosity reduction in the hydraulic oil sample until the viscosity reduction percentage reaches a preset percentage. This increase in the number of cycles leads to a longer test cycle. Multiple shearing units arranged in parallel can divide the hydraulic oil sample into multiple portions. These portions are sheared by different shearing units and then converge into the outlet oil path 4. In this application, multiple shearing units arranged in parallel increase the number of times the hydraulic oil sample is sheared, thereby reducing the number of cycles during the test and shortening the test cycle to quickly determine the shear stability of the hydraulic oil sample.

[0047] Furthermore, the shearing opening of each shearing unit is unrestricted; in other words, there is no need to adjust the shearing opening of each shearing unit sequentially before the test begins. As a result, the test cycle is further shortened.

[0048] like Fig. 3 As shown, in the third embodiment, the number of shearing units is at least three, and multiple shearing units are arranged in a mixed configuration.

[0049] Specifically, multiple shearing units are arranged in series to form a shearing unit group, and multiple shearing unit groups are arranged in parallel. In this application, multiple shearing units arranged in a mixed manner increase the number of times the hydraulic oil sample is sheared in a single cycle, thereby reducing the number of cycles in the test process and shortening the test cycle to quickly determine the shearing stability of the hydraulic oil sample.

[0050] Furthermore, multiple shearing units within the same shearing unit group are arranged in descending order of shearing opening to achieve an ascending order of shearing degree on the hydraulic oil sample, thereby maximizing the shearing effect of each shearing unit and further shortening the testing cycle.

[0051] In some embodiments, the shearing unit includes a shearing oil passage and an opening adjustment member disposed on the shearing oil passage. The opening adjustment member is used to adjust the size of the cross-sectional channel of the shearing oil passage. The larger the size of the cross-sectional channel of the shearing oil passage, the larger the shearing opening of the shearing unit; the smaller the size of the cross-sectional channel of the shearing oil passage, the smaller the shearing opening of the shearing unit. In this application, the size of the cross-sectional channel of the shearing oil passage is adjusted by setting an opening adjustment member to achieve the adjustment of the shearing opening of the shearing unit.

[0052] Optionally, the opening adjustment component includes a steel plate with shearing holes. The steel plate is placed inside the shearing oil passage. The size of the shearing holes determines the size of the cross-sectional channel of the shearing oil passage. The steel plate is easier to manufacture and install, and the cost is lower.

[0053] Preferably, the opening adjustment component includes a shut-off valve, which has its own adjustment function. The shut-off valve has the same structure and function as the hydraulic valve in the hydraulic system, so that the test results are more consistent with the actual situation.

[0054] Those skilled in the art will understand that, in addition to the steel plate and the shut-off valve mentioned above, other opening adjustment components that can adjust the shearing opening of the shearing oil circuit also fall within the scope of protection of this application.

[0055] In some embodiments, the sampling module includes a sampling oil passage 6 and a sampling valve 5 disposed on the sampling oil passage 6. The inlet end of the sampling oil passage 6 is connected to the outlet oil passage 4, and the outlet end of the sampling oil passage 6 is open.

[0056] Specifically, when sampling is required for viscosity testing, sampling valve 5 is opened to allow a portion of the hydraulic oil sample to flow from the outlet end into the sampling container.

[0057] In some embodiments, a thermometer 7 is provided on the hydraulic oil tank 1. The thermometer 7 is used to detect the temperature inside the hydraulic oil sample. Since the accuracy of the shear stability determination of fluids with high viscosity index is easily affected by temperature during the evaluation of shear stability, it is necessary to monitor the temperature in real time to adjust the temperature of the hydraulic oil sample to keep it constant.

[0058] In some embodiments, the hydraulic oil tank 1 is equipped with an air filter 8.

[0059] In some embodiments, the oil inlet circuit 2 is provided with an electric motor oil pump assembly 9 and an overflow valve 10, with the electric motor oil pump assembly 9 located upstream of the overflow valve 10.

[0060] It should be noted that the structure and function of the air filter 8, the motor oil pump assembly 9, and the overflow valve 10 are well known to those skilled in the art and are not part of the core improvements of this application, so they will not be described in detail here.

[0061] A specific embodiment of this application also provides a test method using the hydraulic oil shear stability evaluation device 100 provided in this application:

[0062] First, add a hydraulic oil sample of known viscosity to the hydraulic oil tank 1; second, adjust the shearing opening of each shearing unit; then, start the motor oil pump group 9 to extract the hydraulic oil sample for cyclic shearing and record the test start time; then, open the sampling valve 5 every 4 hours to take a sample and test the viscosity; finally, when the viscosity decreases by 10%, stop the test and record the test termination time.

[0063] The time difference between the start time and the end time of the test is the indicator for evaluating the shear stability of hydraulic oil.

[0064] In this application, the determination of the shear stability of hydraulic oil is completed within the hydraulic circuit consisting of a hydraulic oil tank 1, an inlet oil line 2, a shear unit, and an outlet oil line 4, without the need for preheating and break-in of the testing device. As a result, the testing cycle for the shear stability of hydraulic oil is significantly shortened, thereby enabling rapid determination of the shear stability of hydraulic oil samples and facilitating the simulation of viscosity changes of hydraulic oil in actual application environments, thus making the test results more consistent with actual applications.

[0065] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A hydraulic oil shear stability evaluation device, characterized in that, include: Hydraulic oil tank (1), containing hydraulic oil samples; The shearing module (3) has an oil inlet passage (2) connected to the hydraulic oil tank (1) at its oil inlet end and an oil outlet passage (4) connected to the hydraulic oil tank (1) at its oil outlet end. The shearing module (3) includes multiple shearing units. The sampling module is connected to the oil outlet (4) and is used to sample the hydraulic oil.

2. The hydraulic oil shear stability evaluation device according to claim 1, characterized in that, Multiple shearing units are arranged in series.

3. The hydraulic oil shear stability evaluation device according to claim 2, characterized in that, The shearing opening of one of any two shearing units that is relatively closer to the oil inlet passage (2) is greater than that of the other that is relatively closer to the oil outlet passage (4).

4. The hydraulic oil shear stability evaluation device according to claim 1, characterized in that, Multiple shearing units are arranged in parallel with each other.

5. The hydraulic oil shear stability evaluation device according to claim 1, characterized in that, The number of shearing units is at least three, and multiple shearing units are arranged in a mixed configuration.

6. The hydraulic oil shear stability evaluation device according to claim 1, characterized in that, The shearing unit includes a shearing oil circuit and an opening adjustment member disposed on the shearing oil circuit. The opening adjustment member is used to adjust the size of the cross-sectional channel of the shearing oil circuit.

7. The hydraulic oil shear stability evaluation device according to claim 6, characterized in that, The opening adjustment component includes a shut-off valve.

8. The hydraulic oil shear stability evaluation device according to claim 6, characterized in that, The opening adjustment component includes a steel plate with shearing holes.

9. The hydraulic oil shear stability evaluation device according to claim 1, characterized in that, The sampling module includes a sampling oil circuit (6) and a sampling valve (5) installed on the sampling oil circuit (6). The oil inlet of the sampling oil circuit (6) is connected to the oil outlet of the sampling oil circuit (4), and the oil outlet of the sampling oil circuit (6) is open.

10. The hydraulic oil shear stability evaluation device according to claim 1, characterized in that, The hydraulic oil tank (1) is equipped with a thermometer (7); and / or, The hydraulic oil tank (1) is equipped with an air filter (8); and / or, The oil inlet circuit (2) is equipped with a motor-driven oil pump assembly (9); and / or, An overflow valve (10) is provided on the oil inlet circuit (2).

Images