Device for testing characteristics of tumble air passage of engine with flatwise placed cylinder cover

Abstract

The invention discloses an engine tumble airway characteristic testing device with a flatwise cylinder cover, which is structurally characterized in that a simulation cylinder sleeve is flatwise placed on a test bed, and a horizontal shaft type anemograph is mounted in the tumble simulation cylinder sleeve and is perpendicular to the axis of the tumble simulation cylinder sleeve. The round blade is installed on the blade shaft and rotates in the tumble simulation cylinder sleeve to convert energy of engine air channel tumble into mechanical energy to be output. Deep groove ball bearings, bearing sleeves, end covers and bearing washers are symmetrically and sequentially arranged at the two ends of the blade shaft respectively. The deep groove ball bearing and the bearing sleeve are assembled together and used for supporting and lubricating the blade shaft, and the Hall sensor is fixedly installed on the bearing sleeve at one end of the blade shaft through threads and used for measuring rotating speed signals. The tumble simulation cylinder sleeve adopts a structure similar to that of the vortex simulation cylinder sleeve, and a certain angle is formed between the horizontal shaft type anemograph shaft and the cylinder cover valve, so that the measurement precision is improved, the arrangement structure of the device is changed, and the online detection of the cylinder cover can be met while the convenience is improved.

Description

Technical Field

[0001] The invention relates to the technical field of engine structure, and mainly relates to the testing of engine airway characteristic parameters, in particular to a cylinder head flat placement mechanism designed for testing engine airway parameters. Background Art

[0002] As the global energy crisis and environmental issues become increasingly severe, emission standards become more stringent, and people's demand for fuel economy and power increases, improving fuel economy, increasing thermal efficiency and reducing emissions will become the main research directions of the internal combustion engine industry.

[0003] The flow field in the engine cylinder has a great influence on the combustion process and emission characteristics. Improving the airway performance is one of the important ways to enhance the flow field in the cylinder. At present, the tumble simulation cylinder liner with a 90° bend is widely used in the tumble airway characteristic test of the engine cylinder head. The tested cylinder head is placed upright, and the distance from the test platform to the center of the cylinder diameter of the tumble simulation cylinder liner is relatively long, which attenuates the tumble intensity to a certain extent, resulting in small test data. In the test, the cylinder head is placed upright and connected to the tumble simulation cylinder liner. It is difficult to replace the cylinder during the test, and as the number of cylinders increases, the material strength of the tumble simulation cylinder liner will not be enough to support the cylinder head. Therefore, how to accurately and efficiently measure the tumble intensity in the engine cylinder has become an important problem that needs to be solved urgently.

[0004] The present invention provides a mechanism for laying the engine cylinder head flat for tumble flow passage characteristic testing to solve the above-mentioned problem. Summary of the invention

[0005] In view of the design defects of the current engine tumble flow passage characteristic testing device, the purpose of the present invention is to provide an engine tumble flow passage characteristic testing device with a horizontal cylinder head.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: an engine tumble airway characteristic test device with a cylinder head placed horizontally, comprising a cylinder head, a tumble simulation cylinder sleeve, and a horizontal axis anemometer, wherein the horizontal axis anemometer is installed in the tumble simulation cylinder sleeve. The tumble simulation cylinder sleeve is placed horizontally and fixed on the test bench with bolts, the axis of the horizontal axis anemometer is perpendicular to the axis of the tumble simulation cylinder sleeve, and the horizontal axis anemometer is equipped with a blade shaft and a bearing sleeve. The circular blade is installed on the blade shaft, and the circular blade rotates in the tumble simulation cylinder sleeve to convert the energy of the engine airway tumble into mechanical energy output. Deep groove ball bearings, bearing sleeves, end covers, and bearing washers are symmetrically arranged at both ends of the blade shaft in sequence. The deep groove ball bearing and the bearing sleeve are assembled together to support and lubricate the blade shaft, the bearing washer is used to adjust the axial clearance, and the Hall sensor is fixedly installed on the bearing sleeve at one end of the blade shaft through threads, and the Hall sensor is used to measure the speed signal.

[0007] The diameter of the tumble flow simulation cylinder sleeve is D, and a through hole is provided at a position 0.6D from the upper end surface of the tumble flow simulation cylinder sleeve for installing a horizontal shaft anemometer. The center of the pressure hole is 1.2D from the upper end surface of the tumble flow simulation cylinder sleeve. When the angle α between the blade shaft and the valve is 45°, it is the best angle for testing the tumble flow effect.

[0008] The characteristics and beneficial effects of the present invention are:

[0009] (1) The horizontal anemometer in the device is placed horizontally inside the tumble flow simulation cylinder liner, and the engine cylinder head is directly connected to the tumble flow simulation cylinder liner, so that the engine cylinder head can be placed flat on the test bench, which reduces the difficulty and risk factor of operation and greatly increases the application range of the test equipment.

[0010] (2) Compared with the tumble flow simulation cylinder liner test device with a 90° bend angle, the device of the present invention reduces the distance from the engine cylinder head to the center of the cylinder diameter, truly restores the tumble flow process in the cylinder, and greatly improves the accuracy of the test data. The comparative data is shown in Table 1.

[0011] type <![CDATA[Average flow coefficient C f > <![CDATA[Rolling flow ratio R t > Original test device 0.48 0.960 Testing device of the present invention 0.50 0.975

[0012] (3) The steady-state flow characteristics of the engine cylinder head airway are measured by the airway test bench. First, the tumble flow simulation cylinder sleeve is fixed on the airway test bench by bolts. During the test, the cylinder head is placed on the tumble flow simulation cylinder sleeve and positioned with a positioning plate. The angle α between the blade shaft and the valve is adjusted to the optimal value by the dial on the test bench. The pressure tapping hole is connected to the blower pipeline of the test bench. Under different valve lifts, the blower exhausts or blows air to the system, forming a certain airway pressure difference in the upstream and downstream of the cylinder head airway, thereby simulating the intake or exhaust process of the engine. After setting the position of the Hall sensor and the displacement sensor, the test is started through the computer. After the test is completed, the tumble flow test data can be directly obtained. When replacing the test cylinder, the roller table is used to lift and move the cylinder head position. The present invention can especially meet the online detection of the engine cylinder head and greatly improve the detection efficiency.

[0013] (4) The device has a simple structure and scientific design, and can accurately simulate the flow of air in the engine cylinder, meeting the requirements of engine intake duct tests for tumble intensity accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the horizontal structure for testing the tumble flow characteristics of the engine cylinder head.

[0015] Figure 2 It is a cross-sectional view of the tumble flow simulation cylinder liner of the device of the present invention.

[0016] Figure 3 It is a schematic diagram of the assembly structure of the blade shaft system in the present invention.

[0017] Figure 4 Schematic diagram of the internal structure of the device of the present invention.

[0018] Figure 5 It is a schematic diagram of the angle between the blade shaft and the valve in the device of the present invention. DETAILED DESCRIPTION

[0019] The structure of the present invention is further described in detail below with reference to the accompanying drawings and through specific embodiments. Any further limitation or replacement of equivalent functions based on the technical solution of the present invention shall fall within the protection scope of the present invention.

[0020] The structure of the engine tumble flow airway characteristic test device with the cylinder head placed horizontally is as follows: the tumble flow simulation cylinder sleeve 1 is placed horizontally and fixed on the test bench with bolts 2, the horizontal axis anemometer 3 is installed inside the tumble flow simulation cylinder sleeve, and the axis of the horizontal axis anemometer is perpendicular to the axis of the tumble flow simulation cylinder sleeve. The horizontal axis anemometer is equipped with a blade shaft 5 and a bearing sleeve 7, and a circular blade 4 is installed on the blade shaft. The outer diameter of the circular blade is slightly smaller than the diameter of the tumble flow simulation cylinder sleeve. The circular blade rotates in the tumble flow simulation cylinder sleeve to convert the energy of the engine airway tumble flow into mechanical energy output. Deep groove ball bearings 6, bearing sleeves, end covers 8, and bearing washers 9 are symmetrically arranged at both ends of the blade shaft in sequence. The deep groove ball bearings and the bearing sleeves are assembled together to support and lubricate the blade shaft, which can reduce the friction coefficient during its movement and ensure its rotation accuracy. The deep groove ball bearings, bearing washers, and end covers at both ends of the blade shaft have the same structure and specifications.

[0021] The bearing washer is used to adjust the axial clearance. The Hall sensor 10 is fixedly mounted on the bearing sleeve at one end of the blade shaft by threading, and detects the speed signal emitted by the magnetic sheet in the groove area, converts it into a square wave output signal, and then measures its speed signal.

[0022] like Figure 2 As shown, as an embodiment, the diameter of the tumble simulation cylinder sleeve D = 140mm, then a through hole is provided at a position 84mm away from the upper end surface of the tumble simulation cylinder sleeve for installing a horizontal axis anemometer. The pressure taking hole 11 is processed from a conical surface, and the center distance of the pressure taking hole is 168mm. The angle α between the blade shaft and the valve 12 will directly affect the magnitude of the tumble intensity. When α is 45°, the tumble ratio is the largest. As a preferred embodiment, α = 45° is the angle with the best tumble effect.

[0023] A groove is provided at the right end of the blade shaft, and a magnetic piece is placed in the groove. The magnetic piece rotates with the shaft to provide a speed signal to the Hall sensor.

[0024] The bearing sleeves at the left and right ends of the horizontal axis anemometer are fixed on the tumble flow simulation cylinder sleeve by welding.

[0025] The circular blade is provided with two mounting holes 13, which are connected with the mounting holes on the blade shaft and fixed by bolts. The circular blade converts the energy of the tumble flow into mechanical energy and provides a signal for measuring the tumble flow.

[0026] The distance between the Hall sensor and the magnetic sheet will affect the test signal. The closer the distance, the stronger the magnetic field strength. When the Hall sensor is close to the object to be measured (usually a rotating part with a magnetic element), it can detect a stronger magnetic field signal; if the distance is too close, the magnetic field strength may exceed the range of the Hall sensor, resulting in magnetic saturation. Once magnetic saturation occurs, the sensor output signal will no longer change linearly with the change of magnetic field strength, but tend to a constant value, which will distort the measurement result. As a preferred distance between the two, 2.5mm.

Claims

1. An engine tumble flow airway characteristic test device with a cylinder head placed horizontally comprises a cylinder head, a tumble flow simulation cylinder liner, and a horizontal axis anemometer, wherein the horizontal axis anemometer is installed in the tumble flow simulation cylinder liner, and is characterized in that: The tumble flow simulation cylinder sleeve (1) is placed horizontally and fixed on a test bench by bolts (2). The axis of the horizontal shaft anemometer (3) is perpendicular to the axis of the tumble flow simulation cylinder sleeve. The horizontal shaft anemometer is equipped with a blade shaft (5) and a bearing sleeve (7). The circular blade (4) is installed on the blade shaft. The circular blade rotates in the tumble flow simulation cylinder sleeve to convert the energy of the engine airway tumble flow into mechanical energy output. Deep groove ball bearings (6), bearing sleeves, end covers (8), and bearing washers (9) are symmetrically arranged at both ends of the blade shaft in sequence. The deep groove ball bearings and the bearing sleeves are assembled together to support and lubricate the blade shaft. The bearing washers are used to adjust the axial clearance. The Hall sensor (10) is fixedly installed on the bearing sleeve at one end of the blade shaft by threads. The Hall sensor is used to measure the speed signal.

2. The tumble flow characteristics testing device for an engine with a cylinder head placed horizontally according to claim 1, characterized in that: The diameter of the tumble flow simulation cylinder sleeve is D, and a through hole is provided at a position 0.6D away from the upper end surface of the tumble flow simulation cylinder sleeve for installing a horizontal axis anemometer, and the center distance length of the pressure taking hole (11) is 1.2D of the upper end surface of the tumble flow simulation cylinder sleeve.

3. The engine tumble flow passage characteristic testing device with a cylinder head placed horizontally according to claim 1, characterized in that: When the included angle between the blade shaft and the valve (12) is 45°, it is the best angle for testing the tumble effect.

4. The tumble flow characteristics testing device for an engine with a cylinder head placed horizontally according to claim 1, characterized in that: A groove is provided at the right end of the blade shaft, and a magnetic piece is placed in the groove. The magnetic piece rotates with the shaft to provide a speed signal for the Hall sensor.

5. The tumble flow characteristics testing device for an engine with a cylinder head placed horizontally according to claim 1, characterized in that: The bearing sleeves at the left and right ends of the horizontal axis anemometer are fixed on the tumble flow simulation cylinder sleeve by welding.

6. The tumble flow characteristics testing device for an engine with a cylinder head placed horizontally according to claim 1, characterized in that: Two mounting holes (13) are provided on the circular blade, which are butted with the mounting holes on the blade shaft and fixed by bolts.

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