Active air intake grille sealing performance test system

Abstract

The present invention relates to an active air intake grille sealing performance test system, comprising a fan and an air duct interconnected with each other, the air duct comprising a pipe section, a bell mouth section with increasing diameter and a diameter expansion section which are sequentially interconnected along the axial direction, the fan is connected to the pipe section, and the active air intake grille to be tested is connected to the diameter expansion section; wherein pressure metering devices are respectively arranged in the pipe section and the diameter expansion section of the air duct. The active air intake grille sealing performance test system of the present invention uses the pressure difference at both ends of the active grille to be tested as a target parameter, and adjusts the frequency of the first fan and the second fan so that the target parameter is always equal to a preset value, thereby measuring the actual leakage rate of the active grille to be tested; through the combination of the dual fans, the test requirements of a larger flow range can be met.

Description

Technical Field

[0001] The invention relates to the field of vehicle active air intake grille sealing performance testing, and more specifically to an active air intake grille sealing performance testing system. Background Art

[0002] At present, in order to improve vehicle stability and fuel economy, more and more cars are using active grille designs. Active grilles are shutters that can control the opening and closing angles. They can automatically control the opening and closing angles through a controller to maximize the car's air intake efficiency and heat dissipation efficiency, thereby reducing fuel consumption. When designing an active grille, it is necessary to meet the requirements that when the blades are closed, the air intake of the air inlet can be blocked; when the blades are open, sufficient air intake can be obtained from the air inlet. The airflow leakage of the blade housing and the grille system when the blades are closed must not be higher than the corresponding proportion of the airflow leakage when the blades are open. This proportion needs to be calculated after obtaining the airflow leakage when the blades are open and closed through experiments. This test data plays a very critical role in the design and function realization of the active grille, and is a parameter that all OEMs focus on.

[0003] In the prior art, there are two main methods for testing the sealing performance of active air intake grilles. One is to indirectly examine the effect of active air intake grilles on the drag coefficient by relying on the wind tunnel test of the whole vehicle; the other is to calculate by CFD simulation. These two methods obtain the leakage of active air intake grilles by indirect means or simulation, but cannot measure the actual leakage, so it will inevitably produce large errors. Summary of the invention

[0004] The purpose of the present invention is to provide a system for testing the sealing performance of an active air intake grille, which can directly measure the leakage of the active air intake grille and provide a more accurate result.

[0005] The present invention provides a system for testing the sealing performance of an active air intake grille, comprising: a fan and an air duct which are interconnected, wherein the air duct comprises a pipe section, a bell mouth section with a gradually increasing diameter, and a diameter expansion section which are sequentially interconnected along the axial direction, the fan is connected to the pipe section, and the active air intake grille to be tested is connected to the diameter expansion section; wherein,

[0006] Pressure measuring devices are respectively arranged in the pipe section and the diameter-enlarged section of the air duct.

[0007] Furthermore, the fan includes a first fan and a second fan respectively connected to the pipe section.

[0008] Furthermore, the flow rate of the first fan is 0-9000m 3 / h, the flow rate of the second fan is 0-16000m 3 / h.

[0009] Furthermore, the diameter expansion section includes an airflow rectification section and an airflow stabilization section which are interconnected, and a turbulent flow net and a honeycomb are arranged in the airflow rectification section.

[0010] Furthermore, the airflow rectifying section and the airflow stabilizing section are connected via screws.

[0011] Furthermore, a reinforcement structure is provided on the outer side of the diameter-enlarged section.

[0012] Furthermore, the reinforcement structure is a reinforcement rib, a quick clamp or a pneumatic clamping device.

[0013] Furthermore, the diameter-enlarged section is made of steel or high-strength plastic.

[0014] Furthermore, the pressure measuring device in the pipe section is a differential pressure sensor, and the pressure measuring device in the diameter-enlarged section is a total pressure probe.

[0015] Furthermore, it also includes a control device, which is electrically connected to the fan and the pressure metering device respectively.

[0016] The active air intake grille sealing performance testing system of the present invention uses the pressure difference at both ends of the active grille to be tested as the target parameter, and adjusts the frequency of the first fan and the second fan so that the target parameter is always equal to the preset value, thereby measuring the actual leakage rate of the active grille to be tested; through the combination of dual fans, it can meet the testing requirements of a larger flow range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of an active air intake grille sealing performance test system provided by an embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a diameter expansion section of an active air intake grille sealing performance test system and an active grille to be tested provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings and described in detail.

[0020] It should be noted that the “left” and “right” in the present invention are based on the directions in the drawings and are only for the convenience of description, rather than limiting the present invention.

[0021] like Figure 1As shown, an embodiment of the present invention provides an active air intake grille sealing performance test system, including a fan and an air duct 2, the fan is connected to the left end of the air duct 2, and the active grille 3 to be tested is connected to the right end of the air duct 2. The fan serves as a power source for the test system and can provide airflow to the air duct 2. The airflow enters the active grille 3 to be tested through the air duct 2 to complete the test.

[0022] The fan can be set as a double fan combination, which includes a first fan 11 and a second fan 12, and the first fan 11 and the second fan 12 are respectively connected to the left end of the air duct 2. For example, the flow rate of the first fan 11 can be 0-9000m 3 / h, the flow rate of the second fan 12 can be 0~16000m 3 / h. The airflow rate required by the air duct 2 can be selected according to the size of the active grille 3 to be tested and the target vehicle speed. When the required flow rate is small (the flow rate range is 0~9000m 3 / h), the first fan 11 can be used as a power source to provide flow; when the required flow is medium (the flow range is 9000~16000m 3 / h), the second fan 12 can be used as a power source to provide flow; when the required flow is large (the flow range is 16000~25000m 3 / h), the first fan 11 and the second fan 12 work simultaneously. Through the dual fan combination of the first fan 11 and the second fan 12, the test requirements of a larger flow range can be met.

[0023] It should be noted that the number of fans may be one, three or more, as long as the flow requirements of the test can be met, and the present invention does not limit this.

[0024] The air duct 2 includes a pipe section 20, a bell-mouth section 23 with increasing diameter, and a diameter-enlarged section 24, which are axially interconnected from left to right, wherein the left end of the pipe section 20 is connected to the fan, and the right end of the diameter-enlarged section 24 is connected to the active air intake grille 3 to be tested.

[0025] The pipe section 20 includes a confluence section 21 and a flow measurement section 22 which are interconnected from left to right, wherein the confluence section 21 receives the airflow generated by the first fan 11 and the second fan 12, and the airflow enters the flow measurement section 22 after being evenly mixed in the confluence section 21. The flow measurement section 22 is used to measure the leakage of the active grille 3 to be measured, and is provided with a pressure metering device (not shown in the figure), such as a differential pressure sensor, which is used to measure the difference between the total pressure and the static pressure of the airflow in the flow measurement section 22. The velocity of the airflow can be calculated according to the Bernoulli equation, and then the velocity and the cross-sectional area of ​​the flow measurement section 22 are integrated to obtain the flow rate per unit time, which is the leakage of the active air intake grille. The specific calculation method is as follows:

[0026] Q = ∫υdS;

[0027] Among them, P 1 is the total pressure, P 2 is the static pressure, ρ is the air density, υ is the air flow velocity in the flow measurement section 22, Q is the flow rate per unit time in the flow measurement section 22, and S is the cross-sectional area of ​​the flow measurement section 22.

[0028] In order to ensure that the airflow entering the active grille 3 to be tested is uniform, a diameter expansion section 24 needs to be placed in front of the active grille to be tested, and the cross-sectional area of ​​the diameter expansion section 24 is much larger than the cross-sectional area of ​​the pipe section 20. Therefore, the bell-mouth section with increasing diameter functions as airflow distribution, which is used to distribute the airflow from the small cross-section of the pipe section 20 to the large cross-section of the diameter expansion section 24 roughly evenly, so as to stabilize the airflow in the diameter expansion section 24. The cross-sectional area of ​​the bell-mouth section 23 with increasing diameter gradually increases from left to right, and the cross-sectional area of ​​the left end is the same as the cross-sectional area of ​​the flow measurement section 22, and the cross-sectional area of ​​the right end is the same as the cross-sectional area of ​​the diameter expansion section 24.

[0029] The diameter expansion section 24 is used to stabilize the airflow, and a pressure metering device is also provided therein, such as a total pressure probe 4. The total pressure probe 4 is located at one end of the diameter expansion section 24 close to the active grille 4 to be tested, and is used to measure the total pressure of the airflow. The strength of the diameter expansion section 24 needs to meet the design requirements of the maximum wind pressure of the test system. For example, the maximum wind pressure requirement of the present invention is 4000Pa. Considering the corresponding safety factor (for example, 3), the corresponding diameter expansion section 24 is designed to withstand a pressure of 12000Pa. Through CAE simulation calculation, a steel plate of corresponding thickness is selected as the material of the diameter expansion section 24 to meet the strength requirements. At the same time, a reinforcing structure can be set outside the diameter expansion section 24 to ensure its rigidity.

[0030] Specifically, the material of the diameter-enlarged section 24 may also be high-strength plastic, and the reinforcement structure may be a reinforcing rib, a quick clamp or a pneumatic clamping device, etc., which is not limited in the present invention.

[0031] like Figure 2 As shown, the diameter expansion section 24 can adopt a two-stage split structure, which is connected by screw fastening, which is convenient for transportation and installation and commissioning. Specifically, the diameter expansion section 24 includes an airflow rectification section 241 and an airflow stabilization section 242 which are interconnected from left to right. The airflow rectification section 241 adopts a turbulent net and a honeycomb (not shown in the figure) to rectify the airflow delivered from the bell mouth section 23 with increasing diameter, and then stabilize the airflow in the airflow stabilization section 242. The total pressure probe 4 is located in the airflow stabilization section 242 to accurately measure the total pressure of the airflow.

[0032] The airflow straightening section 241 and the airflow stabilizing section 242 both use reinforcing ribs 243 as reinforcing structures to increase rigidity.

[0033] Preferably, the active air intake grille sealing performance test system of the present invention also includes a control device (not shown in the figure), which is electrically connected to the first fan 11, the second fan 12, the pressure difference sensor and the total pressure probe 4, respectively, for controlling the entire process of the test system.

[0034] Specifically, the specific process of the test system of the present invention is as follows:

[0035] The pressure difference between the left and right ends of the active grille 3 to be tested (i.e., the difference between the total pressure in the air duct 2 and the atmospheric pressure) is taken as the target parameter. During the test, the target parameter is always kept unchanged and its value is equal to the preset value. The control means is to adjust the driving frequency of the first fan 11 and the second fan 12 through the control device. During the test, according to the speed required by the active grille 3 to be tested (i.e., the running speed of the car), the preset value of the pressure difference between the left and right ends of the active grille 3 to be tested is calculated by the Bernoulli equation, that is, the preset value is equal to 1 / 2*air density*speed*speed. The total pressure probe 4 measures the total pressure in the air duct 2 in real time and sends the measured value to the control device. The control device obtains the real-time atmospheric pressure based on the real-time collected air. The difference between the measured value of the total pressure and the real-time atmospheric pressure is the measured pressure difference, which is the target parameter. The control device compares the measured pressure difference with the preset value. If they are different, the difference is calculated, and the frequency of the first fan 11 and the second fan 12 is adjusted according to the difference so that the measured pressure difference is equal to the preset value. The specific adjustment method is common knowledge in the art and will not be repeated in the present invention. When the measured pressure difference is always equal to the preset value, the flow of the flow measurement section 22 is calculated according to the method described above, which is the leakage amount. The test is performed once when the blades of the active grille 3 to be tested are opened and closed, respectively, to obtain the leakage amount when the blades are opened and the leakage amount when the blades are closed, and the ratio of the two is the leakage rate.

[0036] The active air intake grille sealing performance testing system provided by the embodiment of the present invention takes the pressure difference at both ends of the active grille 3 to be tested as the target parameter, and adjusts the frequency of the first fan 11 and the second fan 12 so that the target parameter is always equal to the preset value, thereby measuring the actual leakage rate of the active grille 3 to be tested; through the combination of dual fans, it can meet the testing requirements of a larger flow range.

[0037] The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The above embodiment of the present invention can also be modified in various ways. That is, all simple, equivalent changes and modifications made according to the claims and the description of the present invention fall within the scope of protection of the claims of the present invention. The contents not described in detail in the present invention are all conventional technical contents.

Claims

1. A method for measuring the leakage of an active air intake grille by using an active air intake grille sealing performance test system, It is characterized in that The active air intake grille sealing performance test system comprises a fan and an air duct which are interconnected, wherein the air duct comprises a pipe section, a bell mouth section with a gradually increasing diameter, and a diameter expansion section which are sequentially interconnected along the axial direction, the fan is connected to the pipe section, and the active air intake grille to be tested is connected to the diameter expansion section; wherein, The pipe section includes a merging section and a flow measurement section which are interconnected from left to right, and the flow measurement section is used to measure the leakage of the active grid to be measured; Pressure measuring devices are respectively arranged in the flow measurement section and the diameter expansion section; The control device is electrically connected to the fan and the pressure metering device respectively; The method includes: According to the speed of the active air intake grille, a preset value of the pressure difference of the active air intake grille is calculated by the Bernoulli equation; The pressure metering device in the diameter expansion section measures the total pressure in the air duct in real time and sends the measured value to the control device. The control device obtains the real-time atmospheric pressure based on the real-time collected air. The difference between the measured value of the total pressure and the real-time atmospheric pressure is the measured pressure difference. The control device compares the measured pressure difference with the preset value. If they are different, the difference is calculated and the frequency of the fan is adjusted according to the difference so that the measured pressure difference is equal to the preset value. When the measured pressure difference is always equal to the preset value, the difference between the total pressure and the static pressure of the airflow in the flow measurement section is measured by the pressure metering device in the flow measurement section, and the velocity of the airflow is calculated according to the Bernoulli equation. The leakage of the active air intake grille is then obtained by integrating the velocity and the cross-sectional area of ​​the flow measurement section.

2. The method according to claim 1, It is characterized in that The fan comprises a first fan and a second fan respectively connected to the pipe sections.

3. The method according to claim 2, It is characterized in that The flow rate of the first fan is 0-9000m 3 / h, the flow rate of the second fan is 0-16000m 3 / h.

4. The method according to claim 1, It is characterized in that The diameter expansion section comprises an airflow rectification section and an airflow stabilization section which are interconnected, and a turbulent flow net and a honeycomb are arranged in the airflow rectification section.

5. The method according to claim 4, It is characterized in that The airflow rectifying section and the airflow stabilizing section are connected via screws.

6. The method according to claim 1, It is characterized in that A reinforcement structure is arranged on the outer side of the diameter-enlarged section.

7. The method according to claim 6, It is characterized in that The reinforcement structure is a reinforcement rib, a quick clamp or a pneumatic clamping device.

8. The method according to claim 1, It is characterized in that The diameter enlarged section is made of steel or high-strength plastic.

9. The method according to claim 1, It is characterized in that The pressure metering device in the flow measurement section is a differential pressure sensor, and the pressure metering device in the diameter expansion section is a total pressure probe.

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