Air outlet air volume testing device and air outlet air volume testing method

Abstract

The invention discloses an air outlet air volume testing device and method, and the device comprises an air volume collection unit which is provided with a first cavity and a first opening, and the first opening is suitable for being communicated with an air outlet; and the air volume testing unit is connected with the air volume collecting unit, a plurality of testing flow channels are formed in the air volume testing unit, each testing flow channel can be communicated with the first cavity, and an anemograph is arranged in each testing flow channel. According to the air outlet air volume testing device, the multiple testing flow channels are arranged, the anemograph is arranged in each testing flow channel, the accuracy of air volume testing is improved, the influence of static pressure testing errors on air volume calculation is reduced, the deformable air volume collecting unit is arranged, the air outlet air volume testing device is suitable for air outlets of various shapes, and the testing accuracy is improved. The test efficiency is improved, the work of manufacturing the air volume collection unit is saved, and the test cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle manufacturing, and in particular to an air outlet air volume testing device and an air outlet air volume testing method. Background Art

[0002] It is pointed out in the related art that the internal circulation air volume of the vehicle HVAC is one of the key parameters for the design and evaluation of the vehicle HVAC thermal management performance and NVH performance. Testing this parameter is of great significance to the design of the vehicle HVAC.

[0003] The test of the internal circulation air volume of the vehicle HVAC outlet has always been a difficult point in the test. It has difficulties in collecting air volume, large differences in test values, and it is difficult to control the impact of the collected air volume on the original flow field. In addition, because collecting air volume generally requires tooling, the cost of this test is relatively high.

[0004] In terms of air volume collection, currently, customized collection tooling is generally used. This tooling needs to be customized according to the area and shape of the air outlet, and is disposable and has a high cost. In addition, this tooling will inevitably cause pressure loss and change the flow field, and the impact on the test results is also difficult to control. In terms of air volume conversion, the nozzle pressure difference method is generally used to convert the air volume. This method converts the air volume passing through the nozzle according to the pressure difference through the nozzle's pressure-flow curve. This method can only guarantee accuracy within a very small air volume range, and this air volume range has a great relationship with air temperature, density, wind speed distribution, etc., so it is difficult to guarantee accuracy. In terms of pressure difference measurement, a probe-type static pressure meter is usually used. This type of instrument is affected by the angle between the probe and the air flow direction, and the error is large. The static pressure value on the windward side is usually larger, and the static pressure on the leeward side is smaller. In addition, it is also affected by air temperature, density, etc., and the error is large. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an air outlet air volume test device, which is suitable for air outlets of various shapes and has high test efficiency and test results.

[0006] The invention also provides a method for testing the air volume at an air outlet.

[0007] According to the first aspect of the present invention, an air outlet air volume testing device includes: an air volume collecting unit, the air volume collecting unit is formed with a first cavity and a first opening connected to the first cavity, the first opening is suitable for connecting with the air outlet; an air volume testing unit, the air volume testing unit is connected to the air volume collecting unit, a plurality of test flow channels are formed in the air volume testing unit, each of the test flow channels can be connected to the first cavity, the air volume testing unit includes an anemometer, and an anemometer is provided in each of the test flow channels.

[0008] According to the air outlet air volume testing device of the present invention, by setting up multiple test flow channels and arranging an anemometer in each test flow channel, the accuracy of the air outlet volume test is improved, the influence of the static pressure test error on the air volume calculation is reduced, and a deformable air volume collection unit is provided to adapt to air outlets of various shapes, thereby improving the test efficiency, saving the work of manufacturing the air volume collection unit, and reducing the test cost.

[0009] In some embodiments, the air volume test unit further includes: a static pressure test assembly, wherein the static pressure test assembly is formed with a static pressure channel and a plurality of static pressure air holes, and each of the static pressure air holes is connected to the static pressure channel.

[0010] In some embodiments, the air volume test unit further includes: a wind shield door, which is openably disposed in the test flow channel and is located upstream of the anemometer in the airflow direction.

[0011] In some embodiments, the air volume test unit has a shell, the shell forms a second cavity and a second opening connected to the second cavity, the second cavity is provided with a rectifying grid extending along the airflow direction, and the rectifying grid defines a plurality of the test flow channels.

[0012] In some embodiments, the static pressure test assembly includes: a first test piece, the first test piece extends along the circumference of the second opening and is arranged on the inner circumferential wall of the second opening, and a plurality of static pressure air holes are formed on the first test piece; a second test piece, the second test piece extends along the circumference of the second opening and is arranged on the circumferential outer side of the second opening, the static pressure channel is formed on the second test piece, and the static pressure channel is connected to each of the static pressure air holes; a static pressure sensor, the static pressure sensor is arranged on the first test piece and / or the second test piece.

[0013] In some embodiments, the air outlet air volume testing device also includes: a boosting device, which is connected to the air volume testing unit, and the boosting device includes an air cylinder and an air flow driving component, and the air flow driving component is arranged in the air cylinder, and the air flow driving component is used to drive the air flow in the air outlet air volume testing device.

[0014] In some embodiments, the airflow driving member includes: a blade and a driver, wherein the driver is connected to the blade to drive the blade to rotate.

[0015] In some embodiments, the air outlet air volume testing device further includes: a calculation module, and the calculation module is electrically connected to the air volume testing unit.

[0016] The method for testing the air volume at an air outlet according to the second aspect of the present invention is applied to the device for testing the air volume at an air outlet according to the first aspect of the present invention, and the testing method comprises:

[0017] Step S1, adjusting the device under test to the target mode;

[0018] Step S2, determining whether the static pressure sensor in the air volume test device reaches a preset value;

[0019] Step S3: if the static pressure sensor reaches the preset value, the boost device is turned on;

[0020] Step S4, adjusting the boost device until the state of the air volume collection unit is stable and the value of the static pressure sensor is within a preset range within a preset time;

[0021] Step S5, determining whether the values ​​of all anemometers are within the target range, if not, adjusting the wind shield door until the values ​​of all anemometers are within the target range;

[0022] Step S6: Calculate the air volume test value according to a preset formula.

[0023] The method for testing the air volume at an air outlet according to the present invention is applied to the air volume testing device at an air outlet of the first aspect, thereby improving the testing accuracy of the air volume testing device at an air outlet and reducing the influence of the static pressure test error on the air volume calculation.

[0024] Furthermore, the preset formula is:

[0025]

[0026] Where Q is the air volume test value, n is the number of open test channels, v k is the value of the anemometer in the kth open test channel, S k is the area of ​​the kth open test flow channel.

[0027] Furthermore, the target mode is: the compressor is not working, the blower is working, the gear is the lowest air volume gear, full cold air blows on the surface and it is an internal circulation mode.

[0028] Furthermore, the preset value is not less than 70Pa.

[0029] Furthermore, the preset time is 1 min, and the preset range is 0-10 Pa.

[0030] Furthermore, the target range is 15m / s-35m / s.

[0031] Furthermore, the testing method also includes: step S0, sealingly connecting the air volume collection unit to the periphery of the air outlet.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of an air outlet air volume testing device according to an embodiment of the present invention;

[0034] Figure 2 yes Figure 1 A schematic diagram of an air volume test unit shown in;

[0035] Figure 3 yes Figure 2 A front view schematic diagram of the air volume test unit shown in ;

[0036] Figure 4 yes Figure 1 Schematic diagram of the booster device shown in .

[0037] Reference numerals:

[0038] 100. Air outlet air volume test device;

[0039] 1. Air volume collection unit;

[0040] 2. Air volume test unit; 21. Test flow channel; 22. First test piece; 221. Static pressure air hole; 23. Second test piece; 24. Shell; 25. Rectification grille; 26. Anemometer;

[0041] 3. Pressurizing device; 31. Air cylinder; 32. Air flow driving part; 321. Blade. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0043] Reference below Figure 1-Figure 4 An air outlet air volume testing device 100 according to an embodiment of the first aspect of the present invention is described.

[0044] like Figure 1-Figure 4 As shown, an air outlet air volume testing device 100 according to an embodiment of the first aspect of the present invention includes: an air volume collecting unit 1 and an air volume testing unit 2.

[0045] Specifically, the air volume collection unit 1 is formed with a first cavity and a first opening connected to the first cavity, and the first opening is suitable for connecting to the air outlet. As shown in the figure, the air volume collection unit 1 can be a cylindrical soft plastic material, the first cavity is formed in the soft plastic material and both ends are opened to connect to the outside world, and the first opening can be deformed, so that the first opening can be matched with an air outlet of any shape. In this way, it is ensured that all the air volume at the air outlet is collected and introduced into the air volume test device, and the airflow pressure in the air outlet air volume test device 100 can be adjusted by prompting the bulging or concave state change of the air volume collection unit 1.

[0046] Furthermore, the air volume test unit 2 is connected to the air volume collection unit 1, and a plurality of test channels 21 are formed in the air volume test unit 2, each of which can be connected to the first cavity, and each of which is provided with an anemometer 26. Figure 1 As shown, the air volume test unit 2 is connected to the end of the air volume collection unit 1 away from the first opening, each test channel is connected to the first cavity, and multiple test channels 21 extend along the air flow direction. Each test channel 21 is formed as a narrow and long rectangular channel. The airflow enters the test channel 21 and becomes laminar flow, which is convenient for the anemometer 26 located in the test channel 21 to measure, thereby improving the measurement accuracy.

[0047] The air outlet air volume test device 100 is mainly used to collect and test the circulating air volume in the air outlet of the vehicle's air conditioner, and is used for the air volume test of the vehicle's HVAC (heating, ventilation and air conditioning system) so as to evaluate the thermal comfort and NVH (noise, vibration and harshness) performance. When using the air outlet air volume test device 100, the air outlet air volume test device 100 is connected to each air outlet of the automobile air conditioner in turn, and the air volume of each air outlet is tested in turn. The sum of the air volume is the circulating air volume in the automobile HVAC, and the air volume can be further reasonably allocated to each air outlet according to the total air volume. Specifically, a wind volume collection unit 1 made of soft plastic material is first placed at the position of the air outlet to collect the air volume, and cloth-based adhesive can be used for bonding and sealing. After the air volume is collected, the airflow is distributed to each test channel 21. The airflow in each test channel 21 is measured by the anemometer 26 and the air volume is calculated by the calculation module. The air volume is calculated by multiplying the air flow velocity by the area of ​​the test channel 21. Compared with the traditional nozzle pressure difference test method, the influence of static pressure test error on the air volume calculation is reduced.

[0048] According to the air outlet air volume testing device 100 of the embodiment of the present invention, by setting up multiple test flow channels 21 and setting up an anemometer 26 in each test flow channel 21, the accuracy of the air outlet volume test is improved, the influence of the static pressure test error on the air volume calculation is reduced, and a deformable air volume collection unit 1 is set to adapt to air outlets of various shapes, thereby improving the test efficiency, saving the work of manufacturing the air volume collection unit 1, and reducing the test cost.

[0049] Preferably, the anemometer 26 is a hot wire anemometer 26. The working principle of the hot wire anemometer 26 is: a thin metal wire (called a hot wire) that is electrically heated is placed in the airflow. The heat dissipated by the hot wire in the airflow is related to the flow velocity. The heat dissipation causes the temperature of the hot wire to change, which causes the resistance to change. The flow velocity signal is converted into an electrical signal. It has two working modes: 1. Constant current mode: the current passing through the hot wire remains unchanged. When the temperature changes, the resistance of the hot wire changes, and thus the voltage at both ends changes, thereby measuring the flow velocity; 2. Constant temperature mode: the temperature of the hot wire remains unchanged, such as 150°C, and the flow velocity can be measured according to the current required to be applied.

[0050] Specifically, a hot wire is set in each test flow channel 21. During the test, a voltage is applied to the hot wire to heat the hot wire. After heating, the resistance of the hot wire increases. The current decreases. If wind blows through the hot wire, the hot wire will cool down, the resistance will decrease, and the current will increase. The data processing system can infer the wind speed based on the current value at a certain voltage. The above-mentioned anemometer 26 is a mature product with the characteristics of small sensor terminal, small impact on the flow field, and fast response.

[0051] In some embodiments of the present invention, the air volume test unit 2 further includes: a static pressure test assembly, the static pressure test assembly is formed with a static pressure channel and a plurality of static pressure air holes 221, each static pressure air hole 221 is connected to the static pressure channel. Figure 2 and Figure 3 As shown, a plurality of static pressure air holes 221 are formed on both the windward side and the leeward side. The different static pressures in each static pressure air hole 221 are fully balanced in the static pressure channel to obtain an average static pressure value, and the rotation speed of the airflow driving member 32 is judged and adjusted by the average static pressure value.

[0052] In some embodiments of the present invention, the air volume test unit 2 further includes: a wind shield door, which is openably disposed on the test flow channel 21 and is located upstream of the anemometer 26 in the air flow direction. Specifically, when the measured air volume is small, at least half of the test flow channel 21 can be retained to ensure that the wind speed near the hot wire anemometer 26 can reach the accurate measurement range of the anemometer 26.

[0053] In some embodiments of the present invention, the air volume test unit 2 has a housing 24, the housing 24 is formed with a second cavity and a second opening connected to the second cavity, and a rectifying grid extending along the airflow direction is provided in the second cavity, and the rectifying grid defines a plurality of test flow channels 21. Figure 2 As shown, the rectifying grid 25 divides the second cavity into a plurality of test flow channels 21, each of which is in a rectangular shape. The gas flows through the rectifying grid 25 and becomes laminar flow, which is convenient for the hot wire anemometer 26 to measure and improves the accuracy of the measurement.

[0054] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the static pressure test assembly includes: a first test piece 22, a second test piece 23 and a static pressure sensor, the first test piece 22 extends along the circumference of the second opening and is arranged on the inner circumferential wall of the second opening, a plurality of static pressure air holes 221 are formed on the first test piece 22, the second test piece 23 extends along the circumference of the second opening and is arranged on the circumferential outer side of the second opening, a static pressure channel is formed in the second test piece 23, the static pressure channel is connected with each static pressure air hole 221, and the static pressure sensor is arranged on the first test piece 22 and / or the second test piece 23. Thus, effective and accurate measurement of the static pressure of the fluid is achieved.

[0055] In some embodiments of the present invention, the air outlet air volume test device 100 further includes: a booster device 3, the booster device 3 is connected to the air volume test unit 2, the booster device 3 includes a wind tube 31 and an air flow driving member 32, the air flow driving member 32 is arranged in the wind tube 31, and the air flow driving member 32 is used to drive the air flow in the air outlet air volume test device 100. Specifically, the air flow driving member 32 is preferably a fan with stepless speed adjustment, and the air flow at the air outlet is appropriately boosted by adjusting the speed of the air flow driving member 32 to offset the influence of the wind resistance in the test device, thereby improving the accuracy of the test and ensuring the test results.

[0056] Furthermore, the airflow driving member 32 includes: a blade 321 and a driver, and the driver is connected to the blade 321 to drive the blade 321 to rotate. Therefore, the arrangement of the blade 321 and the driver is simple, easy to assemble, and reduces the difficulty of assembly and production cost.

[0057] In some embodiments of the present invention, the air outlet air volume test device 100 further includes: a calculation module, which is electrically connected to the air volume test unit 2. In this way, the air outlet air volume can be accurately measured, which reduces manual operations and reduces deviations.

[0058] The method for testing the air volume at an air outlet according to the second aspect of the present invention is applied to the air volume testing device 100 according to the first aspect of the present invention. The testing method includes:

[0059] Step S1, adjusting the device under test to the target mode;

[0060] Step S2, determining whether the static pressure sensor in the air volume test device reaches a preset value;

[0061] Step S3: if the static pressure sensor reaches a preset value, the boost device 3 is turned on;

[0062] Step S4, adjusting the boost device 3 until the state of the air volume collection unit 1 is stable and the value of the static pressure sensor is within a preset range within a preset time;

[0063] Step S5, determining whether the values ​​of all anemometers 26 are within the target range, if not, adjusting the wind shield door until the values ​​of all anemometers 26 are within the target range;

[0064] Step S6: Calculate the air volume test value according to a preset formula.

[0065] The method for testing the air volume at the air outlet according to an embodiment of the present invention is applied to the air volume testing device 100 of the first aspect of the embodiment, thereby improving the testing accuracy of the air volume testing device 100 and reducing the influence of the static pressure test error on the air volume calculation.

[0066] Specifically, the preset formula is:

[0067]

[0068] Wherein, Q is the air volume test value, n is the number of open test channels 21, and v k is the value of the anemometer 26 in the kth open test flow channel 21, S k is the area of ​​the kth opened test flow channel 21 .

[0069] Specifically, the target mode is: the compressor is not working, the blower is working, the gear is the lowest air volume gear, full cold air is blowing on the face and it is an internal circulation mode.

[0070] Specifically, the preset value is not less than 70Pa, the preset time is 1min, and the preset range is 0-10Pa.

[0071] Specifically, the target range is 15m / s-35m / s.

[0072] Furthermore, the testing method also includes: step S0, sealingly connecting the air volume collection unit 1 to the periphery of the air outlet.

[0073] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air outlet air volume testing device, characterized in that: include: An air volume collecting unit, wherein the air volume collecting unit is formed with a first cavity and a first opening communicating with the first cavity, wherein the first opening is adapted to communicate with the air outlet; An air volume testing unit, wherein the air volume testing unit is connected to the air volume collecting unit, wherein a plurality of testing flow channels are formed in the air volume testing unit, wherein each of the testing flow channels can be connected to the first cavity, and wherein the air volume testing unit includes an anemometer, wherein each of the testing flow channels is provided with an anemometer.

2. The air outlet air volume testing device according to claim 1, characterized in that: The air volume test unit further includes: a static pressure test assembly, wherein the static pressure test assembly is formed with a static pressure channel and a plurality of static pressure air holes, and each of the static pressure air holes is connected to the static pressure channel.

3. The air outlet air volume testing device according to claim 2, characterized in that: The air volume test unit further includes: a wind shield door, which is openably disposed on the test flow channel and is located upstream of the anemometer in the airflow direction.

4. The air outlet air volume testing device according to claim 3, characterized in that: The air volume test unit has a shell, the shell is formed with a second cavity and a second opening connected to the second cavity, a rectifying grid extending along the airflow direction is arranged in the second cavity, and the rectifying grid defines a plurality of the test flow channels.

5. The air outlet air volume testing device according to claim 4, characterized in that: The static pressure test assembly comprises: A first test piece, the first test piece extending along the circumference of the second opening and arranged on the inner circumferential wall of the second opening, a plurality of the static pressure air holes being formed on the first test piece; a second test piece, the second test piece extending along the circumference of the second opening and arranged outside the circumference of the second opening, the static pressure channel being formed in the second test piece, and the static pressure channel being connected to each of the static pressure air holes; A static pressure sensor is provided on the first test piece and / or the second test piece.

6. The air outlet air volume testing device according to claim 4, characterized in that: Also includes: A boosting device, wherein the boosting device is connected to the air volume test unit, and the boosting device comprises an air cylinder and an air flow driving component, wherein the air flow driving component is arranged in the air cylinder, and the air flow driving component is used to drive the air flow in the air outlet air volume test device.

7. The air outlet air volume testing device according to claim 6, characterized in that: The airflow driving member comprises: blades and a driver, wherein the driver is connected to the blades to drive the blades to rotate.

8. The air outlet air volume testing device according to claim 4, characterized in that: Also includes: A calculation module is electrically connected to the air volume testing unit.

9. A method for testing the air volume at an air outlet, characterized in that: The air outlet air volume testing device applied to any one of claims 1 to 8, wherein the testing method comprises: Step S1, adjusting the device under test to the target mode; Step S2, determining whether the static pressure sensor in the air volume test device reaches a preset value; Step S3: if the static pressure sensor reaches the preset value, the boost device is turned on; Step S4, adjusting the boost device until the state of the air volume collection unit is stable and the value of the static pressure sensor is within a preset range within a preset time; Step S5, determining whether the values ​​of all anemometers are within the target range, if not, adjusting the wind shield door until the values ​​of all anemometers are within the target range; Step S6: Calculate the air volume test value according to a preset formula.

10. The testing method according to claim 9, characterized in that: The preset formula is: Where Q is the air volume test value, n is the number of open test channels, v k is the value of the anemometer in the kth open test channel, S k is the area of ​​the kth open test flow channel.

11. The testing method according to claim 10, characterized in that: The target mode is: the compressor is not working, the blower is working, the gear is the lowest air volume gear, full cold air is blowing on the surface and it is an internal circulation mode.

12. The testing method according to claim 10, characterized in that: The preset value is not less than 70Pa.

13. The testing method according to claim 10, characterized in that: The preset time is 1 min, and the preset range is 0-10 Pa.

14. The testing method according to claim 10, characterized in that: The target range is 15m / s-35m / s.

15. The testing method according to claim 10, characterized in that: Also includes: Step S0, sealingly connecting the air volume collection unit to the periphery of the air outlet.

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