Device and method for testing separation efficiency of centrifugal ventilator of lubricating oil system

Abstract

The invention discloses a device and a method for testing the separation efficiency of a centrifugal ventilator of a lubricating oil system. The testing device comprises a low-pressure air source, an air storage tank, a first valve, an air heater, an air flow meter, an air inlet pressure sensor, an air inlet temperature sensor, an air outlet pressure sensor, a second valve, a third valve, a paper filter element, a movable oil tank, a lubricating oil heater, a lubricating oil flow meter, a fourth valve, a fifth valve, a sixth valve and a lubricating oil pressure sensor. The device comprises a lubricating oil temperature sensor, an atomizing nozzle, a lubricating oil collector, an electronic scale, an electric spindle, a coupler and a rotating speed sensor. According to the method, the mass of the lubricating oil collected by the lubricating oil collector and the mass of the lubricating oil collected by the paper filter element within the set time are measured, and the separation efficiency of the centrifugal ventilator of the lubricating oil system can be obtained through calculation. The problems that in the separation efficiency testing process of the centrifugal ventilator of the lubricating oil system, lubricating oil is difficult to atomize, and the separation efficiency testing data accuracy is poor are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating oil systems, and in particular relates to a separation efficiency testing device and a testing method for a centrifugal ventilator of a lubricating oil system. Background Art

[0002] The separation efficiency test of the centrifugal ventilator in the lubricating oil system has always faced problems such as difficulty in atomizing the lubricating oil and test accuracy. To solve the above problems, the applicant submitted a Chinese utility model patent in 2022 (CN217845962U, 2022.11.18, a device for testing oil mist separation efficiency), and provided an atomization efficiency test device and test method in the patent. However, the scheme still has the following problems during operation:

[0003] 1. Lubricating oil is difficult to atomize, and the test needs to simulate the mixture of atomized lubricating oil and air generated when the engine is working. Due to the high density and viscosity of lubricating oil, and the lack of a dedicated lubricating oil atomizing nozzle, it is difficult to achieve efficient atomization of lubricating oil in the test, and the oil mist generated is quite different from the actual working conditions.

[0004] 2. The separation efficiency test results have large errors and low accuracy. The oil mass accounts for a small proportion, the oil flow rate is difficult to control during the test, and the oil mass in the air is difficult to collect. Summary of the invention

[0005] The present invention aims to provide a device and method for testing the separation efficiency of a centrifugal ventilator in a lubricating oil system, so as to solve the problem of testing the separation efficiency of a centrifugal ventilator in a lubricating oil system mentioned in the background technology and accurately measure the separation efficiency of the centrifugal ventilator in a lubricating oil system.

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

[0007] A device for testing separation efficiency of a centrifugal ventilator of a lubricating oil system, comprising:

[0008] A transmission system for driving the centrifugal ventilator of the lubricating oil system to be tested;

[0009] a first air pipeline and a first lubricating oil pipeline connected to the inlet of the centrifugal ventilator of the lubricating oil system to be tested;

[0010] a second air pipeline connected to the air outlet of the centrifugal ventilator of the lubricating oil system to be tested;

[0011] A second lubricating oil pipeline connected to the lubricating oil outlet of the centrifugal ventilator of the lubricating oil system to be tested;

[0012] The first air pipeline is connected in sequence with a low-pressure air source, an air storage tank, a first valve, an air heater and an air flow meter, the outlet of the air flow meter is connected to the inlet of a centrifugal ventilator of the lubricating oil system to be tested, and an air inlet pressure sensor and an air inlet temperature sensor are arranged between the outlet of the air flow meter and the inlet of the centrifugal ventilator of the lubricating oil system to be tested;

[0013] The first lubricating oil pipeline includes a main pipeline and a branch pipeline, wherein the main pipeline is connected in sequence to a mobile oil tank with an oil pump, a lubricating oil heater, a lubricating oil flow meter, a sixth valve, a lubricating oil pressure sensor, a lubricating oil temperature sensor and an atomizing nozzle, the branch pipeline is connected in parallel to a fourth valve and a fifth valve, and the inlets of the fourth valve and the fifth valve are connected to the inlet of the sixth valve, and the outlets of the fourth valve and the fifth valve are connected to the inlet of the mobile oil tank, and the first lubricating oil pipeline is connected to the outlet of the air flow meter of the first air pipeline via the atomizing nozzle;

[0014] The second air pipeline includes a first branch pipeline and a second branch pipeline, wherein the first branch pipeline is sequentially connected to an air outlet pressure sensor and a second valve, the second branch pipeline is sequentially connected to a third valve and a paper filter element, the inlet of the second valve is connected to an air outlet of a centrifugal ventilator of the lubricating oil system to be tested, the outlet of the second valve is connected to the atmospheric environment, the inlet of the third valve is connected to an air outlet of a centrifugal ventilator of the lubricating oil system to be tested, and the outlet of the paper filter element is connected to the atmospheric environment;

[0015] The second lubricating oil pipeline is provided with a lubricating oil collector, and the lubricating oil collector is provided with a valve.

[0016] As a solution, the transmission system includes an electric spindle and a coupling.

[0017] As a solution, the separation efficiency test device of the lubricating oil system centrifugal ventilator also includes a rotation speed sensor, which is installed on the lubricating oil system centrifugal ventilator to be tested and is used to monitor the rotation speed of the lubricating oil system centrifugal ventilator to be tested.

[0018] As a solution, the separation efficiency test device of the lubricating oil system centrifugal ventilator also includes an electronic scale, which is used to measure the weight change of the lubricating oil collector and the weight change of the paper filter element.

[0019] As a solution, the air flow meter, air inlet pressure sensor, air inlet temperature sensor, air outlet pressure sensor, lubricating oil flow meter, lubricating oil pressure sensor and lubricating oil temperature sensor are connected to a paperless recorder.

[0020] As a solution, the lubricating oil injection direction at the outlet of the atomizing nozzle is in a straight line and in opposite directions with the air flow direction at the outlet of the air flow meter.

[0021] As a solution, the low-pressure gas source is a gas source with a supply pressure not greater than 0.8 MPa.

[0022] A method for testing the separation efficiency of a centrifugal ventilator of a lubricating oil system adopts the above-mentioned testing device and comprises the following steps:

[0023] Step 1: connect the inlet of the centrifugal ventilator of the lubricating oil system to be tested to the first air pipeline and the first lubricating oil pipeline of the test device, connect the outlet of the centrifugal ventilator of the lubricating oil system to be tested to the second air pipeline and the second lubricating oil pipeline of the test device, connect the centrifugal shaft of the centrifugal ventilator of the lubricating oil system to be tested to the transmission system, and measure the initial weight m1 of the paper filter element and the initial weight M1 of the lubricating oil collector;

[0024] Step 2, opening the first valve and the second valve, closing the third valve, and adjusting the opening of the first valve so that the reading of the air flow meter reaches the value specified by the technical requirements;

[0025] Step 3: When the reading of the air flow meter reaches the value specified by the technical requirements, start the air heater so that the reading of the air inlet temperature sensor reaches the value specified by the technical requirements. During the heating process of the air heater, close the sixth valve, open the fourth valve and the fifth valve, start the oil pump of the mobile oil tank, so that the lubricating oil circulates in the first lubricating oil pipeline, and then start the lubricating oil heater to adjust the lubricating oil temperature to the set value (the lubricating oil heater has a built-in temperature sensor, which can observe the temperature of the lubricating oil in the first lubricating oil pipeline during the heating circulation process, and a temperature sensor can also be set at the outlet of the lubricating oil heater to monitor the lubricating oil temperature);

[0026] Step 4: When the lubricating oil temperature in the first lubricating oil pipeline reaches the set value, the fourth valve is closed, the sixth valve is opened, and the opening of the fifth valve is adjusted so that the reading of the lubricating oil pressure sensor reaches the set value. At this time, the lubricating oil is atomized by the atomizing nozzle and mixed with the low-pressure air at the outlet of the air flow meter in the first air pipeline, and then enters the inlet of the centrifugal ventilator of the lubricating oil system to be tested to start separation;

[0027] Step 5: when the lubricating oil flows out evenly and continuously from the lubricating oil outlet of the centrifugal ventilator of the lubricating oil system to be tested, open the third valve and quickly close the second valve, and at the same time close the valve of the lubricating oil collector;

[0028] Step 6, after the centrifugal ventilator of the lubricating oil system to be tested is stably operated for a period of time, the second valve is opened and the third valve is quickly closed, and the fourth valve is opened and the sixth valve is closed at the same time, and then the weight m2 of the paper filter element and the weight M2 of the lubricating oil collector are respectively measured;

[0029] Step 7: Calculate the separation efficiency η of the centrifugal ventilator of the lubricating oil system to be tested according to the following formula:

[0030] η=(M2-M1) / [(m2-m1)+(M2-M1)].

[0031] As a solution, in step three, the opening of the fourth valve or the fifth valve is adjusted, or the openings of the fourth valve and the fifth valve are adjusted simultaneously, so that the reading of the lubricating oil flow meter reaches a preset value.

[0032] As a solution, in step 4, the lubricating oil temperature in the first lubricating oil pipeline is set to 150±20° C., and the lubricating oil pressure sensor is set to 0.4±0.1 MPa.

[0033] The present invention provides a device for testing the separation efficiency of a centrifugal ventilator of a lubricating oil system, comprising a low-pressure air source for an air pipeline, an air storage tank, a first valve, an air heater, an air flow meter, an air inlet pressure sensor, an air inlet temperature sensor, an air outlet pressure sensor, a second valve, a third valve and a paper filter element, a mobile oil tank for a lubricating oil pipeline, a lubricating oil heater, a lubricating oil flow meter, a fourth valve, a fifth valve, a sixth valve, a lubricating oil pressure sensor, a lubricating oil temperature sensor, an atomizing nozzle, a lubricating oil collector and an electronic scale and a transmission system electric spindle, a coupling, a speed sensor and a connecting tool.

[0034] The present invention provides air through a low-pressure air source, heats the air through an air heater, and then passes the product into it; provides lubricating oil through a mobile oil tank, heats the lubricating oil through a lubricating oil heater, and then atomizes it through an atomizing nozzle; drives the product to operate at a specified speed through a transmission system; finally, the atomized lubricating oil is mixed with air and then enters a centrifugal ventilator of the lubricating oil system for testing; the mass of lubricating oil collected by the lubricating oil collector and the mass of lubricating oil collected by the paper filter element within a specified time are measured, and the separation efficiency of the product can be obtained by calculation.

[0035] Compared with the prior art, the device and method for testing the separation efficiency of the centrifugal ventilator of the lubricating oil system of the present invention have the following advantages and effects:

[0036] (1) The measuring device and method solve the problems of difficult atomization of lubricating oil and inaccurate testing during the test. The high-temperature and high-pressure lubricating oil is efficiently atomized through the atomizing nozzle, then sprayed into the air pipe in the direction against the wind, fully mixed with the air, and finally separated by the centrifugal ventilator of the lubricating oil system; during the test, it is weighed and then calculated, which reduces the measurement error and can provide accurate separation efficiency data. The measuring device uses two different heating methods, self-circulation heating and heater heating, to ensure that the lubricating oil temperature rises steadily, and the lubricating oil pressure is increased by the valve opening, which ultimately improves the atomization effect and solves the problem of difficult atomization of lubricating oil. Among them, the self-circulation heating has the effects of mixing, stirring and heating, and the combination of valves (the fourth valve and the fifth valve) in the lubricating oil bypass can not only accurately control the flow rate, but also have the effect of lubricating oil pressurization.

[0037] (2) The measuring device and method are safe and simple. While increasing the temperature and pressure of the lubricating oil before atomization, the lubricating oil temperature is controlled with a large margin from the flash point temperature of the lubricating oil. The atomized lubricating oil and air collide in reverse and are fully mixed, so that the oil and gas state entering the centrifugal ventilator of the lubricating oil system is closer to the actual working condition. The test method is simple to operate. During the test, the parameters of the paperless recorder are observed and the corresponding valve opening and heater power are adjusted.

[0038] (3) The measuring device uses a common fuel atomizing nozzle (e.g., a nozzle with a 0.1 mm aperture) in combination with high-temperature and high-pressure lubricating oil to atomize the lubricating oil. Due to the characteristics of lubricating oil at low and normal temperatures, the lubricating oil is heated to (150±20)°C, pressurized to (0.4±0.1)MPa, and then passed through a common fuel nozzle to achieve efficient atomization of the lubricating oil, without the need to design a special atomizing nozzle.

[0039] (4) The test method uses the oil mass collected from the outlet air and the oil outlet mass to calculate the oil mass entering the centrifugal ventilator of the oil system, which reduces the error of calculating the oil mass by a single oil flow rate, thereby improving the accuracy of the separation efficiency test. The high-temperature and high-pressure oil is atomized by the atomizing nozzle and then sprayed into the air pipeline for mixing, which is closer to the actual working conditions and avoids large particles of oil directly participating in the separation, resulting in large errors in the separation efficiency test.

[0040] (5) The measuring device is designed with two pipelines at the air outlet of the centrifugal ventilator of the lubricating oil system, one of which has a valve and a paper filter element, and the other has only a valve. The two pipelines can be quickly switched between the test state and the non-test state, so as to accurately use the paper filter element to collect and separate the lubricating oil in the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of a separation efficiency test device for a centrifugal ventilator of a lubricating oil system in the present invention;

[0042] Figure 2 is a schematic diagram of the atomizing nozzle entering the first air pipeline in the present invention;

[0043] In the figure: 1-first valve, 2-second valve, 3-third valve, 4-fourth valve, 5-fifth valve, 6-sixth valve. DETAILED DESCRIPTION

[0044] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0045] like Figure 1 and Figure 2 As shown, a lubricating oil system centrifugal ventilator separation efficiency test device designed by the present invention includes a three-way system (air system, lubricating oil system and transmission system), the air system includes an inlet air pipeline and an outlet air pipeline, the lubricating oil system includes an inlet lubricating oil pipeline and an outlet lubricating oil pipeline, and the transmission system includes an electric spindle and a coupling.

[0046] The air pipeline connected to the inlet of the centrifugal ventilator of the lubricating oil system is connected in sequence with a low-pressure air source, an air storage tank, a first valve 1, an air heater, an air flow meter, an air inlet pressure sensor and an air inlet temperature sensor;

[0047] The lubricating oil pipeline connected to the inlet of the centrifugal ventilator of the lubricating oil system is connected in sequence with a mobile oil tank, a lubricating oil heater, a lubricating oil flow meter, a fourth valve 4, a fifth valve 5, a sixth valve 6, a lubricating oil pressure sensor, a lubricating oil temperature sensor and an atomizing nozzle (a 0.1 mm fuel atomizing nozzle is used in this embodiment);

[0048] An air outlet pressure sensor, a second valve 2, a third valve 3 and a paper filter element are sequentially connected to the air pipeline connected to the air outlet of the centrifugal ventilator of the lubricating oil system;

[0049] The lubricating oil pipe connected to the lubricating oil outlet of the centrifugal ventilator of the lubricating oil system is equipped with a lubricating oil collector with a valve.

[0050] In addition, there are electronic scales for measuring the weight of paper filters and oil collectors.

[0051] like Figure 2 As shown, the oil injection direction at the outlet of the atomizing nozzle is in a straight line and opposite to the air flow direction at the outlet of the air flow meter. This mixing method of air and atomized oil is not only closer to the actual working conditions, but also has good mixing uniformity. It can also avoid large particles of oil directly participating in the separation, resulting in large errors in the separation efficiency test.

[0052] The low-pressure air source in the separation efficiency test device of the lubricating oil system centrifugal ventilator provides low-pressure air to enter the air storage tank, and then the air is heated by the heating device, mixed with the atomized lubricating oil before entering the lubricating oil system centrifugal ventilator, and then passed into the lubricating oil system centrifugal ventilator for testing. The mass of lubricating oil collected by the lubricating oil collector and the mass of lubricating oil collected by the paper filter element within the specified time are measured, and the separation efficiency of the lubricating oil system centrifugal ventilator can be obtained by calculation.

[0053] Among them, the low-pressure air source can continuously provide air at 0 to 0.8 MPa.

[0054] As an option, when it is necessary to test the flow resistance of the centrifugal ventilator of the lubricating oil system, a pressure sensor is set at the air outlet of the centrifugal ventilator of the lubricating oil system. The flow resistance of the centrifugal ventilator of the lubricating oil system is measured by the air inlet pressure sensor and outlet pressure sensor signals of the centrifugal ventilator of the lubricating oil system through a paperless recorder. After the test parameters are stable, the inlet and outlet pressures are recorded, and then the product flow resistance under different working conditions is calculated.

[0055] The air flow is measured by observing the air flow meter signal measured by the paperless recorder, manually adjusting the opening of the first valve 1, and controlling the air flow to reach the value specified by the technical requirements.

[0056] The air temperature is controlled by observing the air inlet temperature sensor signal measured by the paperless recorder, manually adjusting the power of the air heater, and controlling the air inlet temperature to reach the value specified by the technical requirements.

[0057] The speed of the centrifugal ventilator of the lubricating oil system is controlled to reach the value specified by the technical requirements by observing the speed sensor signal measured by the paperless recorder and manually adjusting the frequency of the electric spindle.

[0058] The lubricating oil flow rate is controlled by observing the lubricating oil flow meter signal measured by the paperless recorder, manually adjusting the opening of the fourth valve 4, the fifth valve 5, the sixth valve 6 and the flow of the mobile oil tank, and controlling the lubricating oil mass ratio to reach the value specified by the technical requirements.

[0059] The lubricating oil atomization measures the lubricating oil temperature sensor signal through a paperless recorder, and manually adjusts the power of the lubricating oil heater to control the lubricating oil temperature within the range of (150±20)℃; then measures the lubricating oil pressure sensor signal through a paperless recorder, and manually adjusts the opening of the fourth valve 4, the fifth valve 5, and the sixth valve 6 to control the lubricating oil pressure within the range of (0.4±0.1)MPa.

[0060] The second valve 2 and the third valve 3 are used to switch the air exhaust from the outlet of the centrifugal ventilator of the lubricating oil system and the lubricating oil collection into the paper filter element during test commissioning and test testing.

[0061] The fourth valve 4, the fifth valve 5 and the sixth valve 6 are used to cut off the lubricating oil from entering the atomizing nozzle during test and debugging, so as to enable self-circulation for heating; during test and testing, the lubricating oil is switched to enter the atomizing nozzle, and the lubricating oil pressure entering the atomizing nozzle is adjusted.

[0062] The air flow meter, air inlet pressure sensor, air inlet temperature sensor, air outlet pressure sensor, lubricating oil flow meter, lubricating oil pressure sensor and lubricating oil temperature sensor are connected to the paperless recorder to test and record the test data.

[0063] The method for testing the separation efficiency of the centrifugal ventilator of the lubricating oil system using the above-mentioned separation efficiency testing device comprises the following steps:

[0064] Step 1: Install the centrifugal ventilator of the lubricating oil system to be tested on the transmission system through a coupling and a connecting tool, and install a speed sensor on the centrifugal ventilator of the lubricating oil system; connect the air inlet of the centrifugal ventilator of the lubricating oil system to be tested to the inlet air pipeline, and then install the first valve 1, the air flow meter, the air inlet pressure sensor and the air inlet temperature sensor on the inlet air pipeline; connect the air outlet of the centrifugal ventilator of the lubricating oil system to be tested to the outlet air pipeline, and then install the second valve 2, the third valve 3 and the paper filter element on the outlet air pipeline; connect the lubricating oil inlet of the product to be tested to the inlet lubricating oil pipeline, and then install the lubricating oil flow meter, the fourth valve 4, the fifth valve 5, the sixth valve 6, the lubricating oil pressure sensor, the lubricating oil temperature sensor and the atomizing nozzle on the inlet lubricating oil pipeline; connect the lubricating oil outlet of the product to be tested to the outlet lubricating oil pipeline, and install the lubricating oil collector on the outlet lubricating oil pipeline;

[0065] Step 2: adjust the first valve 1 so that the air flow rate reaches the value specified by the technical requirements; at this time, the second valve 2 is in the open state, and the third valve 3 is closed;

[0066] Step 3: After the air flow rate reaches the requirement, start the air heater power supply and adjust the inlet air temperature to the value specified by the technical requirements;

[0067] Step 4: When the air is heated, close the sixth valve 6, open the fourth valve 4 and the fifth valve 5, start the mobile oil tank power supply, adjust the oil flow and circulate the oil; then start the oil heater power supply and adjust the oil temperature to (150±20)°C;

[0068] Step 5: After the lubricating oil temperature reaches the required value, close the fourth valve 4, open the sixth valve 6, and then slowly adjust the opening of the fifth valve 5 to make the lubricating oil pressure reach (0.4±0.1)MPa; at this time, the high-temperature and high-pressure lubricating oil can be efficiently atomized through the atomizing nozzle, and then sprayed into the air pipeline in the reverse direction of the wind, fully mixed with the air, and finally enter the product for separation;

[0069] Step 6, weigh the initial weights m1 and M1 of the paper filter element and the lubricating oil collector using an electronic scale;

[0070] Step 7: Observe the state of the lubricating oil at the lubricating oil outlet at this time. After the lubricating oil flows out evenly, open the third valve 3, quickly close the second valve 2, and close the lubricating oil collector valve at the same time;

[0071] Step 8: After 10 minutes of stable operation, open the second valve 2 and quickly close the third valve 3; at the same time, open the fourth valve 4 and close the sixth valve 6;

[0072] Step nine, use an electronic scale to weigh the weights m2 and M2 of the paper filter element and the lubricating oil collector at this time;

[0073] Step 10, calculate the separation efficiency η of the centrifugal ventilator according to the following formula:

[0074] η=(M2-M1) / [(m2-m1)+(M2-M1)].

[0075] During the separation efficiency test, it is necessary to observe the air temperature, flow rate, lubricating oil temperature and pressure in real time, and adjust the power of the first valve 1, the fifth valve 5 and the sixth valve 6 as well as the two heaters in time to meet the technical index requirements.

[0076] The following is the actual process of testing the separation efficiency of a centrifugal ventilator in a lubricating oil system:

[0077] a. After installing the centrifugal ventilator of the lubricating oil system on the test bench, start the power supply and check whether the air heater, air flow meter, air inlet pressure sensor, air inlet temperature sensor, air outlet pressure sensor, lubricating oil flow meter, lubricating oil pressure sensor, speed sensor and electronic scale are working properly;

[0078] b. Open the first valve 1 and adjust the air flow to (60±2) kg / h;

[0079] c. After the air flow meets the requirements, start the air heater power supply and adjust the inlet air temperature to (70±5)℃;

[0080] d. When the air is heated, close the sixth valve 6, open the fourth valve 4 and the fifth valve 5, start the mobile oil tank power supply, adjust the oil flow and circulate the oil; then start the oil heater power supply and adjust the oil temperature to (150±20)℃;

[0081] e. When the lubricating oil temperature reaches the required value, close the fourth valve 4, open the sixth valve 6, and then slowly adjust the opening of the fifth valve 5 to make the lubricating oil pressure reach (0.4±0.1)MPa; at this time, the high-temperature and high-pressure lubricating oil can be efficiently atomized through the atomizing nozzle, and then sprayed into the air pipeline against the wind direction, fully mixed with the air, and finally enter the lubricating oil system centrifugal ventilator for separation;

[0082] f. Use an electronic scale to weigh the initial weights m1 and M1 of the paper filter element and the lubricating oil collector;

[0083] g. Observe the state of the lubricating oil at the lubricating oil outlet at this time. After the lubricating oil flows out evenly, open the third valve 3, quickly close the second valve 2, and close the lubricating oil collector valve at the same time;

[0084] h. After 10 minutes of stable operation, open the second valve 2 and quickly close the third valve 3; at the same time, open the fourth valve 4 and close the sixth valve 6;

[0085] i. Use an electronic scale to weigh the weights of the paper filter element and the oil collector at this time, m2 and M2;

[0086] j. Calculate the separation efficiency η of the centrifugal ventilator according to the following formula:

[0087] η=(M2-M1) / [(m2-m1)+(M2-M1)];

[0088] h. After the test, turn off the air heating and lubricating oil heating. When the air and lubricating oil temperatures drop below 60°C, turn off the power supply of the mobile oil tank to stop the oil circulation, and then close the first valve 1 to cut off the low-pressure air source.

[0089] Compared with the applicant's previous proposal, the above proposal has the following characteristics:

[0090] 1) While ensuring that there is still enough oil to reach the flash point after atomization, increase the atomized oil pressure to (0.4±0.1)MPa and the atomized oil temperature to (150±20)℃. As the lubricating oil temperature and pressure are increased, the atomization effect is better when it enters the atomizing nozzle;

[0091] 2) The atomized lubricating oil is sprayed into the inlet air pipeline in reverse direction for mixing. This collision mixing method has a good mixing effect, greater collision kinetic energy, and the resulting mixed oil and gas is closer to the actual working condition;

[0092] 3) The oil mass entering the product is calculated by using the oil mass of the collected outlet air and the oil outlet mass, which reduces the error of calculating the oil mass by a single oil flow rate, thereby improving the accuracy of the separation efficiency test;

[0093] 4) By adding a lubricating oil bypass (returning to the lubricating oil tank via the fourth valve 4 or the fifth valve 5) for self-circulation heating, the scheme of returning the un-atomized lubricating oil in the oil mist generating system of the original test device to the lubricating oil tank is cancelled, thereby solving the shortcoming that the original test device cannot stably and continuously raise the lubricating oil temperature to above 100°C, and improving the atomization efficiency (it has been verified by experiments that lubricating oil below 100°C can hardly be atomized, and increasing the lubricating oil temperature and pressure is conducive to improving the atomization effect, and the temperature needs to be kept stable during the atomization process of the lubricating oil, and there should not be large fluctuations or cooling). In the present invention, the lubricating oil heated by the lubricating oil heater is divided into two paths, one of which returns to the mobile oil tank via the lubricating oil bypass, is evenly mixed with the lubricating oil in the oil tank and its temperature is raised, so that the lubricating oil entering the lubricating oil heater from the mobile oil tank continues to heat up, which is equivalent to using two different heating methods to heat the lubricating oil in the mobile oil tank, and the other path enters the atomizing nozzle and then mixes with the air to ensure the atomization effect of the lubricating oil during the test.

[0094] Professionals and technicians in this field can make various adjustments to this application according to actual conditions. The general principles defined in this application can be implemented in other implementations without departing from the content. Therefore, this application will not be limited to the structures shown in the specific implementation methods, but should conform to the widest scope consistent with the principles and features set forth in the claims of this application.

Claims

1. A device for testing the separation efficiency of a centrifugal ventilator in a lubricating oil system, characterized in that: include: A transmission system for driving the centrifugal ventilator of the lubricating oil system to be tested; a first air pipeline and a first lubricating oil pipeline connected to the inlet of the centrifugal ventilator of the lubricating oil system to be tested; a second air pipeline connected to the air outlet of the centrifugal ventilator of the lubricating oil system to be tested; A second lubricating oil pipeline connected to the lubricating oil outlet of the centrifugal ventilator of the lubricating oil system to be tested; The first air pipeline is connected in sequence to a low-pressure air source, an air storage tank, a first valve (1), an air heater and an air flow meter, the outlet of the air flow meter is connected to the inlet of a centrifugal ventilator of the lubricating oil system to be tested, and an air inlet pressure sensor and an air inlet temperature sensor are arranged between the outlet of the air flow meter and the inlet of the centrifugal ventilator of the lubricating oil system to be tested; The first lubricating oil pipeline comprises a main pipeline and a branch pipeline, wherein the main pipeline is connected in sequence to a mobile oil tank with an oil pump, a lubricating oil heater, a lubricating oil flow meter, a sixth valve (6), a lubricating oil pressure sensor, a lubricating oil temperature sensor and an atomizing nozzle, and the branch pipeline is connected in parallel to a fourth valve (4) and a fifth valve (5), and the inlets of the fourth valve (4) and the fifth valve (5) are connected to the inlet of the sixth valve (6), and the outlets of the fourth valve (4) and the fifth valve (5) are connected to the inlet of the mobile oil tank, and the first lubricating oil pipeline is connected to the outlet of the air flow meter of the first air pipeline via the atomizing nozzle; The second air pipeline comprises a first branch pipeline and a second branch pipeline, wherein the first branch pipeline is connected in sequence to an air outlet pressure sensor and a second valve (2), and the second branch pipeline is connected in sequence to a third valve (3) and a paper filter element, the inlet of the second valve (2) is connected to an air outlet of a centrifugal ventilator of the lubricating oil system to be tested, the outlet of the second valve (2) is connected to the atmospheric environment, the inlet of the third valve (3) is connected to an air outlet of a centrifugal ventilator of the lubricating oil system to be tested, and the outlet of the paper filter element is connected to the atmospheric environment; The second lubricating oil pipeline is provided with a lubricating oil collector, and the lubricating oil collector is provided with a valve.

2. A device for testing separation efficiency of a centrifugal ventilator in a lubricating oil system according to claim 1, characterized in that: The transmission system comprises an electric spindle and a coupling.

3. The separation efficiency test device of a lubricating oil system centrifugal ventilator according to claim 1, characterized in that: It also includes a rotation speed sensor, which is installed on the centrifugal ventilator of the lubricating oil system to be tested and is used to monitor the rotation speed of the centrifugal ventilator of the lubricating oil system to be tested.

4. The device for testing separation efficiency of a centrifugal ventilator in a lubricating oil system according to claim 1, characterized in that: The utility model also comprises an electronic scale, which is used for measuring the weight change of the lubricating oil collector and the weight change of the paper filter element.

5. The device for testing separation efficiency of a centrifugal ventilator in a lubricating oil system according to claim 1, characterized in that: The air flow meter, air inlet pressure sensor, air inlet temperature sensor, air outlet pressure sensor, lubricating oil flow meter, lubricating oil pressure sensor and lubricating oil temperature sensor are connected to the paperless recorder.

6. The device for testing separation efficiency of a centrifugal ventilator in a lubricating oil system according to claim 1, characterized in that: The lubricating oil spraying direction at the outlet of the atomizing nozzle and the air flow direction at the outlet of the air flow meter are on a straight line and in opposite directions.

7. The device for testing separation efficiency of a centrifugal ventilator in a lubricating oil system according to claim 1, characterized in that: The low-pressure gas source is a gas source with a gas supply pressure not greater than 0.8 MPa.

8. A method for testing the separation efficiency of a centrifugal ventilator in a lubricating oil system, characterized in that: The test device according to claim 1 is used, and comprises the following steps: Step 1: connect the inlet of the centrifugal ventilator of the lubricating oil system to be tested to the first air pipeline and the first lubricating oil pipeline of the test device, connect the outlet of the centrifugal ventilator of the lubricating oil system to be tested to the second air pipeline and the second lubricating oil pipeline of the test device, connect the centrifugal shaft of the centrifugal ventilator of the lubricating oil system to be tested to the transmission system, and measure the initial weight m1 of the paper filter element and the initial weight M1 of the lubricating oil collector; Step 2, opening the first valve (1) and the second valve (2), closing the third valve (3), and adjusting the opening of the first valve (1) so that the reading of the air flow meter reaches the value specified by the technical requirements; Step 3: when the reading of the air flow meter reaches the value specified in the technical requirements, start the air heater so that the reading of the air inlet temperature sensor reaches the value specified in the technical requirements. During the heating process of the air heater, close the sixth valve (6), open the fourth valve (4) and the fifth valve (5), start the oil pump of the mobile oil tank, so that the lubricating oil circulates in the first lubricating oil pipeline, and then start the lubricating oil heater to adjust the lubricating oil temperature to the set value; Step 4: When the lubricating oil temperature in the first lubricating oil pipeline reaches the set value, the fourth valve (4) is closed, the sixth valve (6) is opened, and the opening of the fifth valve (5) is adjusted so that the reading of the lubricating oil pressure sensor reaches the set value. At this time, the lubricating oil is atomized by the atomizing nozzle and mixed with the low-pressure air at the outlet of the air flow meter in the first air pipeline, and then enters the inlet of the centrifugal ventilator of the lubricating oil system to be tested and begins to separate; Step 5: when the lubricating oil flows out evenly and continuously from the lubricating oil outlet of the centrifugal ventilator of the lubricating oil system to be tested, the third valve (3) is opened and the second valve (2) is quickly closed, and the valve of the lubricating oil collector is closed at the same time; Step 6: After the centrifugal ventilator of the lubricating oil system to be tested is stably operated for a period of time, the second valve (2) is opened and the third valve (3) is quickly closed, and at the same time, the fourth valve (4) is opened and the sixth valve (6) is closed, and then the weight m2 of the paper filter element and the weight M2 of the lubricating oil collector are respectively measured; Step 7: Calculate the separation efficiency η of the centrifugal ventilator of the lubricating oil system to be tested according to the following formula: η=(M2-M1) / [(m2-m1)+(M2-M1)].

9. A method for testing separation efficiency of a centrifugal ventilator in a lubricating oil system according to claim 8, characterized in that: In the step three, the opening of the fourth valve (4) or the fifth valve (5) is adjusted, or the openings of the fourth valve (4) and the fifth valve (5) are adjusted simultaneously, so that the reading of the lubricating oil flow meter reaches a preset value.

10. A method for testing separation efficiency of a centrifugal ventilator in a lubricating oil system according to claim 8, characterized in that: In the step 4, the lubricating oil temperature in the first lubricating oil pipeline is set to 150±20° C., and the lubricating oil pressure sensor is set to 0.4±0.1 MPa.

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