Gear case performance test system and method

Abstract

The invention belongs to the technical field of gearbox performance testing, and particularly relates to a gearbox performance testing system and method. The system comprises a data processing assembly and a control module. The data processing assembly comprises a data acquisition part and a data analysis part, the data acquisition part and the data analysis part are electrically connected with the control module, and the data acquisition part is installed at a target test position; and the data analysis part is electrically connected with the data acquisition part and is used for calculating the wind resistance loss and the friction loss of the gearbox in the operation process so as to ensure the accuracy and the reliability of a test result.

Description

Technical Field

[0001] The invention belongs to the technical field of gearbox performance testing, and in particular relates to a gearbox performance testing system and method. Background Art

[0002] As the core mechanical component of the high-temperature heat pump unit, the gearbox is responsible for efficiently transmitting the power generated by the generator to the centrifugal compressor and making it reach the required speed. However, during high-speed operation, the gearbox faces a series of challenges such as friction loss and windage loss. These losses not only affect the working efficiency of the gearbox, but may also cause failures, thereby affecting the operating stability and reliability of the entire heat pump unit.

[0003] In order to ensure that the performance of the gearbox meets the design requirements, it is particularly important to perform performance testing before leaving the factory. However, the existing gearbox loss measurement equipment has exposed a series of problems in practical applications, which are specifically manifested in the following aspects: (1) Due to the complexity of the internal structure of the gearbox and the variability of operating conditions, existing measurement equipment often cannot meet high-precision measurement requirements. In addition, environmental factors such as high temperature, high pressure, and vibration inside the gearbox may affect the accuracy and stability of the measurement device, and the measurement error may further increase.

[0004] (2) Traditional test equipment takes a long time to test and is costly. In addition, many parameters are required to calculate the loss, and the collection process of these parameters is cumbersome and inconvenient. This not only increases the complexity of the test work, but also increases the test cost, limiting the widespread application of the test equipment.

[0005] (3) The same test platform can often only test compressors of specific specifications and lacks versatility. This leads to repeated configuration and waste of test resources and cannot meet the needs of gearbox performance testing for heat pump units of different models.

[0006] (4) Although CFD (Computational Fluid Dynamics) simulation technology can be used to calculate windage loss, this method requires high computing resources and is expensive. At the same time, the CFD simulation process is time-consuming and the results are lagging, making it difficult to reflect the actual operating status of the gearbox in a timely manner and unable to meet the needs of real-time monitoring and fault warning.

[0007] In summary, the existing gearbox loss measurement equipment has obvious deficiencies in measurement accuracy, test efficiency, versatility, and real-time monitoring capabilities. Therefore, a new solution is urgently needed to accurately and efficiently complete the performance test of gearboxes for heat pumps of different models and working conditions to solve the above problems. Summary of the invention

[0008] In order to overcome the problems in the prior art, the present invention proposes a gearbox performance testing system and method.

[0009] The technical solution of the present invention to solve the above technical problems is as follows: In a first aspect, the present invention provides a gearbox performance testing system, including a data processing component and a control module; The data processing component includes a data acquisition component and a data analysis component, and the data acquisition component and the data analysis component are electrically connected to the control module respectively. The data acquisition component is used to be installed at the target test position to obtain required data; the data analysis component is electrically connected to the data acquisition component, and is used to calculate the windage loss and friction loss of the gearbox during operation.

[0010] Furthermore, the data acquisition component includes a pressure sensor, a temperature sensor and a mass flow sensor, which are respectively used to acquire the pressure, temperature and mass flow of the target test position.

[0011] Further, the target test position includes the connection part between the compressor and the gearbox, the inside of the gearbox, the oil mist separation device and the compressor outlet, wherein the inside of the gearbox includes a lubricating oil nozzle and a lubricating oil outlet; A first temperature sensor and a first mass flow sensor are provided at the connection part between the compressor and the gear box; a second temperature sensor and a second mass flow sensor are provided at the lubricating oil nozzle; a third temperature sensor, a third mass flow sensor, a fourth temperature sensor and a fourth mass flow sensor are provided at the oil mist separation device; a fifth temperature sensor, a fifth mass flow sensor and a first pressure sensor are provided at the lubricating oil outlet; a second pressure sensor and a sixth temperature sensor are provided in the gear box; a third pressure sensor, a seventh temperature sensor and a seventh mass flow sensor are provided at the compressor outlet.

[0012] In a second aspect, the present invention provides a gearbox performance testing method, which is implemented by the gearbox performance testing system described in the first aspect, and includes the following steps: Step 100: Acquire data of a target test position, the data including pressure, temperature and mass flow; Step 200: Calculate the total loss of the gearbox during operation according to the acquired pressure, temperature and mass flow; calculate the windage loss of the gearbox during operation and calculate the friction loss of the gearbox during operation.

[0013] Furthermore, before step 100, the method further includes: placing the gear box in an insulation assembly, and spraying lubricating oil to the meshing position of the gears through a lubricating oil nozzle.

[0014] Furthermore, the step 100 specifically includes: During the operation of the compressor, the working fluid leaks into the gearbox through the gap between the back of the compressor impeller and the gearbox under the drive of the pressure difference, and the temperature of the leaked working fluid is obtained. T 1 , mass flow m 1 ; Start the oil pump 3 to spray the lubricating oil onto the gear contact surface and record the temperature of the lubricating oil sprayed into the gear box. T 2 , mass flow m 2 ; Remove the working fluid and lubricating oil mixture deposited at the bottom of the gearbox through the oil pump and record the pressure of the mixture P 5 ,temperature T 5 , mass flow m 5 ; Start the vacuum pump and adjust it to draw the working fluid and oil mist in the gear box into the oil mist separation device to maintain negative pressure in the gear box. Record the pressure inside the gear box. P 6 ,temperature T 6 , record the physical parameters of the working fluid and lubricating oil in the oil mist separation device: working fluid temperature T 3 , working fluid mass flow m 3 , lubricating oil temperature T 4 , Lubricating oil mass flow m 4 ; Adjust the compressor to the test condition and measure the pressure of the working fluid P 7 ,temperature T 7 , mass flow m 7 , calculate various losses after the data stabilizes.

[0015] Furthermore, in step 200, the total loss of the gearbox during operation is calculated according to the acquired pressure, temperature and mass flow, including: According to the leaked working fluid temperature T 1 , mass flow m 1 , Calculate the enthalpy of the fluid leaking into the gearbox ; According to the temperature of the lubricating oil injected into the gearbox T2 , mass flow m 2 , calculate the enthalpy of the lubricating oil injected into the gearbox ; According to the working medium temperature in the oil mist separation device T 3 , working fluid mass flow m 3 , calculate the enthalpy of the working fluid in the oil mist separation device ; According to the lubricating oil temperature in the oil mist separation device T 4 , Lubricating oil mass flow m 4 , calculate the enthalpy of the lubricating oil in the oil mist separation device ; Depending on the pressure of the mixture P 5 ,temperature T 5 , mass flow m 5 , calculate the enthalpy of the working fluid in the oil circuit and the enthalpy of the lubricating oil in the oil circuit ; According to the calculated enthalpy of the working fluid leaking into the gearbox , Enthalpy of the lubricating oil injected into the gearbox , Enthalpy of the working fluid in the oil mist separation device , Enthalpy of lubricating oil in oil mist separation device , Enthalpy of the working fluid in the oil circuit and the enthalpy of the lubricating oil in the oil circuit , solve the total loss of the gearbox during operation; ; In the above formula, Indicates the gearbox input power; Indicates the output power of the gearbox; Indicates the oil pump power; Indicates the vacuum pump power; Represents the total loss of the gearbox during operation.

[0016] Furthermore, in the step 200, before calculating the windage loss of the gearbox during operation, it includes: calculating the density of the oil mist mixture and the dynamic viscosity of the oil mist mixture; ; ; In the above formula, Indicates the density of the oil mist mixture; Indicates the dynamic viscosity of the oil mist mixture; Indicates the density of lubricating oil; Indicates the density of the working fluid; C 2 is the correction factor.

[0017] Furthermore, in step 200, the windage loss of the gearbox during operation is calculated according to the density of the oil mist mixture and the dynamic viscosity of the oil mist mixture, and the windage loss includes the windage loss of the driving gear and the windage loss of the driven gear: ; ; In the above formula, Indicates the windage loss of the driving gear; Indicates the tooth width of the driving gear; Indicates the pitch circle radius of the driving gear; Indicates the speed of the driving gear; Indicates the pitch radius of the driving gear; Indicates the windage loss of the driven gear; Indicates the tooth width of the driven gear; Indicates the pitch circle radius of the driven gear; Indicates the speed of the driven gear; Indicates the pitch radius of the driven gear; C 1 is the correction factor.

[0018] Furthermore, in step 200, the friction loss of the gearbox during operation is calculated according to the total loss and windage loss of the gearbox during operation: ; In the above formula, Indicates the windage loss of the driving gear; It represents the driven windage loss; Indicates the friction loss of the gearbox during operation.

[0019] Compared with the prior art, the present invention has the following technical effects: (1) The present invention abandons the redundant components and complex architecture of the traditional test system, while ensuring the functional integrity of the system, achieving a highly simplified structure, and providing an efficient and stable foundation for subsequent test operations.

[0020] (2) The present invention comprehensively considers all the energy input to and output from the gearbox, and based on this, can accurately and effectively measure various performance parameters of the gearbox, thereby ensuring the accuracy and reliability of the test results.

[0021] (3) The present invention has excellent adaptability, can cover and accurately test gearboxes of various specifications and models, and is easy to quickly disassemble and assemble.

[0022] (4) The present invention can accurately calculate the windage loss and friction loss of the test condition based on the sensor feedback data, thereby achieving comprehensive and real-time monitoring of the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the system of the present invention; Figure 2 This is a schematic diagram of the internal structure of the thermal insulation component of the present invention; Figure 3 It is a schematic diagram of the insulation assembly and gear box structure of the present invention.

[0025] 1. Lubricating oil nozzle; 2. Lubricating oil outlet; 3. Oil pump; 4. Vacuum pump; 5. Oil mist separation device; 6. Labyrinth seal; 7. Gear box; 8. Insulation assembly; 81. Top layer; 82. Middle layer; 83. Bottom layer; 9. Impeller. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects taken by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the technical solutions proposed by the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments. The specific features, structures or characteristics in one or more embodiments may be combined in any suitable form. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention.

[0027] Reference Figure 1The gearbox 7 includes a driving gear and a driven gear. Different transmission ratios and output torques can be achieved through the gear combination of the driving gear and the driven gear. The gearbox 7 also includes a lubricating oil nozzle 1, a lubricating oil outlet 2, and an exhaust port. The lubricating oil nozzle 1 is used to accurately spray the lubricating oil onto the contact surface of the moving parts such as the gears; the lubricating oil outlet 2 is used to discharge the waste oil or the parts with excess lubricating oil; the exhaust port is used to discharge the air and oil mist inside the gearbox 7 to maintain the negative pressure state inside the gearbox 7. The oil pump 3 is connected to the lubricating oil nozzle 1 inside the gearbox 7 through a pipeline, and is used to extract the lubricating oil from the oil tank and transport it to the gear contact surface of the gearbox 7, provide sufficient lubricating oil for the gearbox 7, and ensure that the moving parts such as the gears are fully lubricated; the working medium and lubricating oil mixture deposited at the bottom of the gearbox 7 is removed by the oil pump. The vacuum pump 4 is connected to the exhaust port or the oil mist separation device 5 of the gearbox 7 through a pipeline, and is used to draw the working medium and oil mist in the gearbox 7 into the oil mist separation device 5 to maintain the negative pressure inside the gearbox 7.

[0028] In one embodiment of the present invention, referring to Figure 1 , provides a gearbox performance test system, including a data processing component and a control module; The data processing component includes a data acquisition component and a data analysis component, the data acquisition component and the data analysis component are electrically connected to the control module respectively, the data acquisition component is installed at the target test position to obtain the required data, and the data analysis component is electrically connected to the data acquisition component. The data acquisition component includes a pressure sensor, a temperature sensor and a mass flow sensor, which are respectively used to obtain the pressure, temperature and mass flow of the target test position; the target test position includes the connection between the compressor and the gearbox 7, the inside of the gearbox 7, the oil mist separation device 5 and the outlet of the compressor 7, wherein the inside of the gearbox 7 includes a lubricating oil nozzle 1 and a lubricating oil outlet 2.

[0029] Specifically, the connection part between the compressor and the gearbox 7, that is, the connection part between the labyrinth seal 6 at the last section of the compressor output shaft and the gearbox 7. The connection part between the compressor and the gearbox 7 is provided with a first temperature sensor and a first mass flow sensor for measuring the temperature of the working fluid leaked from the compressor into the gearbox 7. T 1 , mass flow m 1 .

[0030] The lubricating oil nozzle 1 is used to spray lubricating oil to moving parts such as gears and bearings to reduce friction and wear and ensure the normal operation of the gear box 7. The lubricating oil nozzle 1 is provided with a second temperature sensor and a second mass flow sensor for measuring the temperature of the lubricating oil sprayed into the gear box 7. T 2, mass flow m 2 .

[0031] The oil mist separator 5 is installed at the exhaust port of the gear box 7, and is used to separate and collect the oil mist generated inside the gear box 7. The oil mist separator 5 is provided with a third temperature sensor, a third mass flow sensor, a fourth temperature sensor and a fourth mass flow sensor, which are used to measure the physical parameters of the working fluid and lubricating oil extracted from the gear box 7: the temperature of the working fluid T 3 , mass flow m 3 , lubricating oil temperature T 4 , mass flow m 4 .

[0032] The lubricating oil outlet 2 is located at the bottom of the gear box 7, and the used lubricating oil is collected and processed through the lubricating oil outlet 2. The lubricating oil outlet 2 is provided with a fifth temperature sensor, a fifth mass flow sensor and a first pressure sensor for measuring the pressure of the working medium and lubricating oil mixture discharged from the gear box 7. P 5 ,temperature T 5 , mass flow m 5 .

[0033] The gear box 7 is provided with a second pressure sensor and a sixth temperature sensor to measure the pressure inside the gear box 7. P 6 ,temperature T 6 .

[0034] The third pressure sensor, the seventh temperature sensor and the seventh mass flow sensor are provided at the compressor outlet to measure the pressure of the working fluid. P 7 ,temperature T 7 , mass flow m 7 The compressor outlet is the impeller 9 position.

[0035] The data analysis component is used to calculate the windage loss and friction loss of the gearbox 7 during operation according to the pressure, temperature and mass flow rate acquired by the data acquisition component.

[0036] It is worth noting that the working fluid leaked from the compressor into the gear box 7 will be pumped away by the vacuum pump 4, thereby maintaining a continuous negative pressure environment inside the gear box 7, ensuring that high temperature and high pressure conditions in the traditional sense will not be formed inside the gear box 7. When the inside of the gear box 7 is in a negative pressure state, the complex airflow and oil flow phenomena inside the gear box 7 that may have been caused by pressure and temperature fluctuations are significantly suppressed. Compared with a normal pressure or positive pressure environment, the movement state of the airflow and oil flow becomes more orderly and no longer chaotic, which provides a closer and more stable measurement environment for the data acquisition component, greatly reducing the measurement error caused by the dynamic interference of the airflow and oil flow, thereby improving the overall measurement accuracy.

[0037] In addition, the negative pressure environment also changes the fluid dynamics inside the gearbox 7. Under negative pressure conditions, the flow of the fluid becomes smoother, reducing the vibration excitation source induced by factors such as fluid impact and turbulence. Not only does it extend the service life of the components, but it also significantly enhances the stability of the data acquisition components, further improving the accuracy and reliability of the measurement data. In summary, this embodiment optimizes the test conditions inside the gearbox by constructing a negative pressure environment, laying a solid foundation for accurate measurement and data analysis.

[0038] The mass sensor used in this embodiment is a Coriolis mass flowmeter. In addition, all sensors are rigidly fixed by a connector seat to avoid measurement errors caused by looseness. All sensors are regularly calibrated to ensure accuracy.

[0039] In this embodiment, refer to Figure 3 The system also includes an insulation component 8, which is used to accommodate and insulate the gear box 7; the insulation component 8 is assembled by welding insulation plates together, and the size and shape of the insulation plates can be adjusted as needed. Among them, the insulation plate includes an outer shell and an internal structure; the outer shell is Q235 steel plate; refer to Figure 2 The internal structure is divided into three layers, namely, a top layer 81, a middle layer 82 and a bottom layer 83; the top layer 81 is flaky aluminum powder, which is used to reflect incident light to reduce heat absorption; the middle layer 82 is an inert gas cavity, which is filled with inert gas argon to further reduce the efficiency of heat transfer through gas conduction and convection; the bottom layer 83 is SiO 2 The aerogel layer is used to block heat transfer through solid conduction.

[0040] The top layer of aluminum flakes has a denser structure and reflective heat insulation properties. It has a good reflection effect on the incident light, thereby reducing most of the heat generated by light absorption. 2The aerogel and the bottom layer of the inert gas cavity have extremely low thermal conductivity, which can effectively block the transfer of heat to the inside; the close combination of these three parts produces a synergistic effect and has a better thermal insulation effect. The inert gas cavity not only greatly reduces the overall weight of the insulation board, but also significantly enhances the stability and durability of its structure, providing solid support and guarantee for the practicality, reliability and wide application of the device.

[0041] Based on the same inventive concept, the embodiment of the present application also provides a gearbox performance test method for implementing the gearbox performance test system involved above. The implementation solution provided by the method is similar to the implementation solution recorded in the above system, so the specific limitations in the embodiments provided below can refer to the above limitations on a gearbox performance test system, and will not be repeated here.

[0042] In one embodiment, a gearbox performance testing method is provided, comprising the following steps: Step 100: Acquire data of a target test position, the data including pressure, temperature and mass flow.

[0043] During the operation of the compressor, the working fluid leaks into the gear box 7 through the gap between the back of the compressor impeller and the gear box 7 under the drive of the pressure difference, and the temperature of the leaked working fluid is obtained. T 1 , mass flow m 1 ; Start the oil pump to spray the lubricating oil onto the gear contact surface and record the temperature of the lubricating oil sprayed into the gear box 7. T 2 , mass flow m 2 ; Remove the working fluid and lubricating oil mixture deposited at the bottom of the gear box 7 through the oil pump 3, and record the pressure of the mixture P 5 ,temperature T 5 , mass flow m 5 ; Start the vacuum pump 4, adjust the vacuum pump 4 to draw the working fluid and oil mist in the gear box 7 into the oil mist separation device 5, so that the gear box 7 maintains a negative pressure, and record the pressure inside the gear box 7 P 6 ,temperature T 6 , record the physical parameters of the working fluid and lubricating oil in the oil mist separation device 5: working fluid temperature T 3 , working fluid mass flow m 3 , lubricating oil temperature T4 , Lubricating oil mass flow m 4 ; According to the parameters required by the test conditions, adjust the compressor inlet guide, air supply regulating valve and exhaust pressure to adjust the opening of the exhaust regulating valve, adjust the compressor to the test conditions, and measure the pressure of the working fluid. P 7 ,temperature T 7 , mass flow m 7 , calculate various losses after the data stabilizes.

[0044] Step 200: Calculate the friction loss of the gearbox 7 during operation according to the acquired pressure, temperature and mass flow.

[0045] As an example, this step may include the following steps: Step 201: Obtain the leaked working fluid temperature T 1 , mass flow m 1 , calculate the enthalpy of the working fluid leaking into the gear box 7; ; In the above formula, Indicates the enthalpy value of the working fluid leaking into the gearbox; Indicates T 1 The constant-pressure specific heat capacity of the working fluid at temperature. This parameter can be obtained by reference.

[0046] Step 202: According to the temperature of the lubricating oil injected into the gear box 7 T 2 , mass flow m 2 , calculate the enthalpy of the lubricating oil injected into the gear box 7; ; In the above formula, Indicates the enthalpy value of the lubricating oil injected into the gearbox; Indicates T 2 The constant-pressure specific heat capacity of lubricating oil at temperature.

[0047] Step 203: According to the working medium temperature in the oil mist separation device 5 T 3 , working fluid mass flow m 3 , calculate the enthalpy value of the working medium in the oil mist separation device 5; ; In the above formula, Indicates the enthalpy value of the working fluid in the oil mist separation device; Indicates T 3 The constant-pressure specific heat capacity of the working fluid at temperature.

[0048] Step 204: According to the temperature of the lubricating oil in the oil mist separation device 5 T 4 , Lubricating oil mass flow m 4 , calculate the enthalpy value of the lubricating oil in the oil mist separation device 5; ; In the above formula, Indicates the enthalpy value of the lubricating oil in the oil mist separation device; Indicates T 4 The constant-pressure specific heat capacity of lubricating oil at temperature.

[0049] Step 205: Based on the pressure of the mixture P 5 ,temperature T 5 , mass flow m 5 , calculate the enthalpy value of the working fluid in the oil circuit and the enthalpy value of the lubricating oil in the oil circuit; ; In the above formula, Indicates the enthalpy value of the working fluid in the oil circuit; Indicates T 5 The constant pressure specific heat capacity of the working fluid at the temperature; Represents the solubility of gas.

[0050] ; In the above formula, Indicates the enthalpy value of the lubricating oil in the oil circuit; Indicates T 5 The specific heat capacity of lubricating oil at constant pressure at temperature; Indicates T 5 Gas solubility at temperature. 5 and P 5 The gas solubility of the working fluid in the mixture under certain conditions. The gas solubility query has experimental results. The solubility of the gas decreases with increasing temperature and increases with increasing pressure.

[0051] Step 207: according to the calculated enthalpy value of the working medium leaking into the gear box 7, the enthalpy value of the lubricating oil injected into the gear box 7, the enthalpy value of the working medium in the oil mist separation device 5, the enthalpy value of the lubricating oil in the oil mist separation device 5, the enthalpy value of the working medium in the oil circuit and the enthalpy value of the lubricating oil in the oil circuit, the total loss of the gear box 7 during operation is solved; ; In the above formula, Indicates the gearbox input power; Indicates the output power of the gearbox; Indicates the oil pump power; Indicates the vacuum pump power; Represents the total loss of the gearbox during operation.

[0052] Step 208: Calculate the windage loss of the gearbox 7 during operation.

[0053] Before calculating the windage loss of the gearbox 7 during operation, the density of the oil mist mixture and the dynamic viscosity of the oil mist mixture are calculated; ; ; In the above formula, Indicates the density of the oil mist mixture; Indicates the dynamic viscosity of the oil mist mixture; Indicates the density of lubricating oil; Indicates the density of the working fluid; C 2 is the correction factor.

[0054] According to the density of the oil mist mixture and the dynamic viscosity of the oil mist mixture, the windage loss of the gearbox 7 during operation is calculated, and the windage loss includes the windage loss of the driving gear and the windage loss of the driven gear: ; ; In the above formula, Indicates the windage loss of the driving gear; Indicates the tooth width of the driving gear; Indicates the pitch circle radius of the driving gear; Indicates the speed of the driving gear; Indicates the pitch radius of the driving gear; Indicates the windage loss of the driven gear; Indicates the tooth width of the driven gear; Indicates the pitch circle radius of the driven gear; Indicates the speed of the driven gear; Indicates the pitch radius of the driven gear; C 1 is the correction factor.

[0055] Step 209: Calculate the friction loss of the gearbox 7 during operation according to the total loss and windage loss of the gearbox 7 during operation.

[0056] ; In the above formula, Indicates the windage loss of the driving gear; It represents the driven windage loss; Indicates the friction loss of the gearbox during operation.

[0057] Before the generator, the gearbox 7 and the compressor are put into operation, the gearbox 7 is placed in the heat-insulating assembly 8, and lubricating oil is sprayed to the gear meshing position through the lubricating oil nozzle 1.

[0058] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A gearbox performance testing system, characterized in that: Includes data processing components and control modules; The data processing component includes a data acquisition component and a data analysis component, and the data acquisition component and the data analysis component are electrically connected to the control module respectively. The data acquisition component is used to be installed at the target test position to obtain required data; the data analysis component is electrically connected to the data acquisition component, and is used to calculate the windage loss and friction loss of the gearbox during operation.

2. A gearbox performance testing system according to claim 1, characterized in that: The data acquisition component includes a pressure sensor, a temperature sensor and a mass flow sensor, which are used to obtain the pressure, temperature and mass flow of the target test position respectively.

3. A gearbox performance testing system according to claim 2, characterized in that: The target test position includes the connection part between the compressor and the gearbox, the inside of the gearbox, the oil mist separation device and the compressor outlet, wherein the inside of the gearbox includes a lubricating oil nozzle and a lubricating oil outlet; A first temperature sensor and a first mass flow sensor are provided at the connection part between the compressor and the gear box; a second temperature sensor and a second mass flow sensor are provided at the lubricating oil nozzle 1; a third temperature sensor, a third mass flow sensor, a fourth temperature sensor and a fourth mass flow sensor are provided at the oil mist separation device; a fifth temperature sensor, a fifth mass flow sensor and a first pressure sensor are provided at the lubricating oil outlet; a second pressure sensor and a sixth temperature sensor are provided in the gear box; a third pressure sensor, a seventh temperature sensor and a seventh mass flow sensor are provided at the compressor outlet.

4. A gearbox performance testing method, implemented by the gearbox performance testing system according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 100: Acquire data of a target test position, the data including pressure, temperature and mass flow; Step 200: Calculate the total loss of the gearbox during operation according to the acquired pressure, temperature and mass flow; Calculate the windage loss of the gearbox during operation and calculate the friction loss of the gearbox during operation.

5. A gearbox performance testing method according to claim 4, characterized in that: The step 100 also includes: placing the gear box in the heat-insulating assembly, and spraying lubricating oil to the gear meshing position through the lubricating oil nozzle.

6. A gearbox performance testing method according to claim 4, characterized in that: The step 100 specifically includes: During the operation of the compressor, the working fluid leaks into the gearbox through the gap between the back of the compressor impeller and the gearbox under the drive of the pressure difference, and the temperature of the leaked working fluid is obtained. T 1. Mass flow m 1; Start the oil pump 3 to spray the lubricating oil onto the gear contact surface and record the temperature of the lubricating oil sprayed into the gear box. T 2. Mass flow m 2. Remove the working fluid and lubricating oil mixture deposited at the bottom of the gearbox through the oil pump and record the pressure of the mixture. P 5. Temperature T 5. Mass flow m 5; Start the vacuum pump and adjust it to draw the working fluid and oil mist in the gear box into the oil mist separation device to maintain negative pressure in the gear box. Record the pressure inside the gear box. P 6. Temperature T 6. Record the physical parameters of the working fluid and lubricating oil in the oil mist separation device: working fluid temperature T 3. Working fluid mass flow m 3. Lubricating oil temperature T 4. Lubricating oil mass flow m 4; Adjust the compressor to the test condition and measure the pressure of the working fluid P 7. Temperature T 7. Mass flow m 7. Calculate various losses after the data stabilizes.

7. A gearbox performance testing method according to claim 6, characterized in that: In step 200, the total loss of the gearbox during operation is calculated according to the acquired pressure, temperature and mass flow, including: According to the leaked working fluid temperature T 1. Mass flow m 1, Calculate the enthalpy of the fluid leaking into the gearbox ; According to the temperature of the lubricating oil injected into the gearbox T 2. Mass flow m 2. Calculate the enthalpy of the lubricating oil injected into the gearbox ; According to the working medium temperature in the oil mist separation device T 3. Working fluid mass flow m 3. Calculate the enthalpy of the working fluid in the oil mist separation device ; According to the lubricating oil temperature in the oil mist separation device T 4. Lubricating oil mass flow m 4. Calculate the enthalpy of the lubricating oil in the oil mist separation device ; Depending on the pressure of the mixture P 5. Temperature T 5. Mass flow m 5. Calculate the enthalpy of the working fluid in the oil circuit and the enthalpy of the lubricating oil in the oil circuit ; According to the calculated enthalpy of the working fluid leaking into the gearbox , Enthalpy of the lubricating oil injected into the gearbox , Enthalpy of the working fluid in the oil mist separation device , Enthalpy of lubricating oil in oil mist separation device , Enthalpy of the working fluid in the oil circuit and the enthalpy of the lubricating oil in the oil circuit , solve the total loss of the gearbox during operation; ； In the above formula, Indicates the gearbox input power; Indicates the output power of the gearbox; Indicates the oil pump power; Indicates the vacuum pump power; Represents the total loss of the gearbox during operation.

8. A gearbox performance testing method according to claim 7, characterized in that: In the step 200, before calculating the windage loss of the gearbox during operation, the steps include: calculating the density of the oil mist mixture and the dynamic viscosity of the oil mist mixture; ； ； In the above formula, Indicates the density of the oil mist mixture; Indicates the dynamic viscosity of the oil mist mixture; Indicates the density of lubricating oil; Indicates the density of the working fluid; C2 is the correction coefficient.

9. A gearbox performance testing method according to claim 8, characterized in that: In step 200, the windage loss of the gearbox during operation is calculated according to the density of the oil mist mixture and the dynamic viscosity of the oil mist mixture, and the windage loss includes the windage loss of the driving gear and the windage loss of the driven gear: ； ； In the above formula, Indicates the windage loss of the driving gear; Indicates the tooth width of the driving gear; Indicates the pitch circle radius of the driving gear; Indicates the speed of the driving gear; Indicates the pitch radius of the driving gear; Indicates the windage loss of the driven gear; Indicates the tooth width of the driven gear; Indicates the pitch circle radius of the driven gear; Indicates the speed of the driven gear; Indicates the pitch circle radius of the driven gear; C1 is the correction coefficient.

10. A gearbox performance testing method according to claim 9, characterized in that: In step 200, the friction loss of the gearbox during operation is calculated according to the total loss and windage loss of the gearbox during operation: ； In the above formula, Indicates the windage loss of the driving gear; It represents the driven windage loss; Indicates the friction loss of the gearbox during operation.

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