Air volume testing device and testing method thereof

Abstract

The present invention provides an air volume test device and a test method thereof, which relate to the field of air volume detection technology, in order to alleviate the technical problems that the measurement result error of the air volume test device existing in the prior art is large and the measurement accuracy is not high. The air volume test device includes a housing and an air volume meter, the housing has an air inlet and an air outlet, and a plurality of pitot tubes are arranged in the housing; each pitot tube includes a total pressure flow channel and a static pressure flow channel that are not connected to each other, the total pressure inlet of the total pressure flow channel faces the air inlet, and the axis of the total pressure inlet is parallel to the air flow direction, and the total pressure outlets of the plurality of total pressure flow channels are all connected to a first pressure taker, and the first pressure taker is connected to the air volume meter; the axis of the static pressure inlet of the static pressure flow channel is perpendicular to the air flow direction, and the static pressure outlets of the plurality of static pressure flow channels are all connected to a second pressure taker, and the second pressure taker is connected to the air volume meter.

Description

Technical Field

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

[0002] As one of the indispensable appliances in modern kitchens, range hoods bear the important responsibility of purifying the kitchen environment. Air volume, or exhaust volume, refers to the total amount of air absorbed and discharged by the range hood per unit time, which is an important indicator to measure its exhaust performance.

[0003] The "air volume" index marked on the product label of the existing range hood actually refers to the air volume when the static pressure value is zero. In actual use, the air volume is difficult to achieve.

[0004] At present, there are many devices for measuring the air volume of range hoods in users' homes, but most of them have large measurement errors and low measurement accuracy. Summary of the invention

[0005] The first purpose of the present invention is to provide an air volume testing device to alleviate the technical problems existing in the prior art of large measurement error and low measurement accuracy of the air volume testing device.

[0006] The air volume testing device provided by the present invention comprises: a shell and an air volume meter, wherein the shell has an air inlet and an air outlet, and a plurality of pitot tubes are arranged inside the shell.

[0007] Each of the pitot tubes includes a total-pressure flow channel and a static-pressure flow channel that are not connected to each other. The total-pressure inlet of the total-pressure flow channel faces the air inlet, and the axis of the total-pressure inlet is parallel to the airflow direction. The total-pressure outlets of the plurality of total-pressure flow channels are connected to a first pressure taking device, and the first pressure taking device is connected to the air volume meter.

[0008] The axis of the static pressure inlet of the static pressure flow channel is perpendicular to the airflow direction, and the static pressure outlets of the plurality of static pressure flow channels are all connected to the second pressure taking device, and the second pressure taking device is connected to the air volume meter.

[0009] Furthermore, the first pressure taking device has a first cavity, and a first air inlet and a first air outlet are provided on the side wall of the first pressure taking device. The first air inlet is connected to the total pressure outlet through a pipeline, and the first air outlet is connected to the air volume meter through a pipeline.

[0010] The second pressure taking device has a second cavity, and a second air inlet and a second air outlet are provided on the side wall of the second pressure taking device. The second air inlet is connected to the static pressure outlet through a pipeline, and the second air outlet is connected to the air volume meter through a pipeline.

[0011] Furthermore, the plurality of pitot tubes are arranged in a circumferential manner at intervals within the housing; or, the plurality of pitot tubes are arranged in a rectangular array.

[0012] Furthermore, a plurality of rectifying plates are provided in the shell, and the plurality of rectifying plates divide the space in the shell into a plurality of rectifying areas. The pitot tube is connected to the rectifying plates, and at least one pitot tube is arranged in each rectifying area.

[0013] The plurality of fairing areas are arranged circumferentially, and a pitot tube is arranged in each of the fairing areas. The pitot tubes in the plurality of fairing areas are arranged circumferentially at intervals in the casing.

[0014] Furthermore, a mounting piece is provided in the shell, and one end of each rectifier plate is clamped with the shell, and the other end is clamped with the mounting piece.

[0015] Furthermore, the mounting member is configured as a long rod-shaped structure, and the end portion thereof close to the air inlet is configured as a cone.

[0016] Furthermore, the first pressure taking device and the second pressure taking device are both trough structures with one end open.

[0017] The first opening of the first pressure taking device is connected to the mounting member, and the first opening is blocked by the mounting member. The first pressure taking device is also provided with an air inlet and an air outlet.

[0018] The first pressure taking device is connected to the second pressure taking device and can block the second opening of the second pressure taking device. The second pressure taking device is also provided with an air inlet and an air outlet.

[0019] Furthermore, the first pressure taking device, the second pressure taking device and the mounting member are coaxially arranged, and the first pressure taking device is located between the second pressure taking device and the mounting member; the distance between the second pressure taking device and the plane where the air inlet is located is 80 to 100 mm.

[0020] Furthermore, the shell is a rectangular cylindrical structure in which the air inlet and the air outlet are arranged opposite to each other.

[0021] Furthermore, the height of the shell is 250-350 mm.

[0022] Furthermore, a trumpet-shaped interface is provided at the air outlet, and the opening size of the trumpet-shaped interface can be adjusted.

[0023] Furthermore, the main body of the trumpet-shaped interface is made of cloth; a drawstring capable of adjusting the size of the opening is provided at the opening of the trumpet-shaped interface, and the trumpet-shaped interface is sealed to the inlet of the range hood to be tested through a connecting piece.

[0024] Beneficial effects:

[0025] It should be noted that, when in use, the air outlet of the shell is arranged directly opposite to the oil net of the range hood.

[0026] The present invention provides an air volume testing device, which is provided with multiple pitot tubes, wherein the total pressure inlet of each pitot tube faces the air inlet, and the axis of the total pressure inlet is parallel to the air flow direction to ensure the accuracy of the subsequent total pressure value test. Similarly, the axis of the static pressure inlet of the static pressure channel is perpendicular to the air flow direction to ensure the accuracy of the subsequent static pressure value test; furthermore, since the total pressure outlets of multiple total pressure channels are all connected to the first pressure taking device, when the airflow in each total pressure channel flows into the first pressure taking device, the first pressure taking device can play a role of averaging the pressure, so that the air volume meter can test the total pressure value after multi-point averaging; similarly, since the static pressure outlets of multiple static pressure channels are all connected to the second pressure taking device, when the airflow in each static pressure channel flows into the second pressure taking device, the second pressure taking device can also play a role of averaging the pressure, so that the air volume meter can test the static pressure value after multi-point averaging.

[0027] From the above, it can be seen that the air volume testing device adopts multi-point testing to obtain the average total pressure value and static pressure value of multiple points. Compared with the single-point testing adopted in the prior art, the result is more accurate, effectively reduces the error and improves the accuracy of the air volume test.

[0028] The second purpose of the present invention is to provide a testing method for an air volume testing device to alleviate the technical problems existing in the prior art of large measurement error and low measurement accuracy of the air volume testing device.

[0029] The test method of the air volume test device provided by the present invention comprises the following steps:

[0030] Test environment temperature T and test environment atmospheric pressure S, according to the formula Calculate the air density ρ in the current environment;

[0031] The total pressure value P in the first pressure taker is obtained by the wind pressure sensor t and the static pressure value P in the second pressure taker s , where P t With P s The difference is P, according to the formula P = KQ 2 ρ, calculate the air volume Q, where K is a constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A first structural schematic diagram of an air volume test device provided in an embodiment of the present invention;

[0034] Figure 2 is a cross-sectional view of the pitot tube;

[0035] Figure 3 for Figure 1 The air volume test device shown can show a right side view of the internal structure;

[0036] Figure 4 for Figure 3 A local enlarged schematic diagram of point A shown;

[0037] Figure 5 for Figure 1 A front view of the air volume test device shown;

[0038] Figure 6 for Figure 1 The air volume test device shown does not show the schematic diagram of the structure of the housing;

[0039] Figure 7 It is a schematic diagram of the disassembled structure of the first pressure taking device, the second pressure taking device and the mounting member;

[0040] Figure 8 for Figure 1 The schematic diagram of the installation structure of the air volume test device and the top suction range hood is shown;

[0041] Fig. 9 A second structural schematic diagram of the air volume test device provided in an embodiment of the present invention;

[0042] Fig.10 for Fig. 9 The schematic diagram of the air volume test device and the installation structure of the side-suction range hood is shown;

[0043] Fig.11 This is a schematic diagram of the structure of the air volume meter.

[0044] icon:

[0045] 100-housing; 110-rectifier plate; 120-rectifier area; 130-mounting part;

[0046] 200-air flow meter;

[0047] 300-pitot; 310-full pressure inlet; 320-full pressure outlet; 330-static pressure inlet; 340-static pressure outlet;

[0048] 400-first pressure taking device; 500-second pressure taking device; 600-ceiling range hood; 700-trumpet-shaped interface; 800-side range hood. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Example

[0051] This embodiment provides an air volume test device, such as Figures 1 to 3 As shown, the air volume testing device includes: a housing 100 and an air volume meter 200, the housing 100 has an air inlet and an air outlet, and a plurality of pitot tubes 300 are arranged in the housing 100; each pitot tube 300 includes a total pressure flow channel and a static pressure flow channel that are not connected to each other, the total pressure inlet 310 of the total pressure flow channel faces the air inlet, and the axis of the total pressure inlet 310 is parallel to the air flow direction, the total pressure outlets 320 of the plurality of total pressure flow channels are all connected to the first pressure taking device 400, and the first pressure taking device 400 is connected to the air volume meter 200; the axis of the static pressure inlet 330 of the static pressure flow channel is perpendicular to the air flow direction, the static pressure outlets 340 of the plurality of static pressure flow channels are all connected to the second pressure taking device 500, and the second pressure taking device 500 is connected to the air volume meter 200.

[0052] It should be noted that, when in use, the air outlet of the housing 100 is arranged directly opposite to the oil net of the range hood.

[0053] The present embodiment provides an air volume test device, which is provided with a plurality of pitot tubes 300, wherein the total pressure inlet 310 of each pitot tube 300 faces the air inlet, and the axis of the total pressure inlet 310 is parallel to the air flow direction to ensure the accuracy of the subsequent test total pressure value. Similarly, the axis of the static pressure inlet 330 of the static pressure channel is perpendicular to the air flow direction to ensure the accuracy of the subsequent test static pressure value. Furthermore, since the total pressure outlets 320 of the plurality of total pressure channels are all connected to the first pressure taking device 400, when When the airflow in each total pressure channel flows into the first pressure taking device 400, the first pressure taking device 400 can play the role of averaging the pressure, so that the air volume meter 200 can test the total pressure value after multi-point averaging; similarly, since the static pressure outlets 340 of multiple static pressure channels are all connected to the second pressure taking device 500, when the airflow in each static pressure channel flows into the second pressure taking device 500, the second pressure taking device 500 can also play the role of averaging the pressure, so that the air volume meter 200 can test the static pressure value after multi-point averaging.

[0054] From the above, it can be seen that the air volume testing device adopts multi-point testing to obtain the average total pressure value and static pressure value of multiple points. Compared with the single-point testing adopted in the prior art, the result is more accurate, effectively reduces the error and improves the accuracy of the air volume test.

[0055] It should be noted that the pitot tube 300 in this embodiment can be directly purchased on the market.

[0056] In this embodiment, if Figure 4 As shown, the total pressure outlets 320 of multiple total pressure channels are connected to the first pressure taking device 400 through pipelines, and the first pressure taking device 400 is connected to the air volume meter 200 through pipelines; similarly, the static pressure outlets 340 of multiple static pressure channels are connected to the second pressure taking device 500 through pipelines, and the second pressure taking device 500 is connected to the air volume meter 200 through pipelines.

[0057] Among them, the first pressure taking device 400 and the second pressure taking device 500 can both play the role of averaging pressure. Therefore, the first pressure taking device 400 is connected to the air meter 200, so that the air meter 200 can directly obtain the total pressure value after multi-point averaging; the second pressure taking device 500 is connected to the air meter 200, so that the air meter 200 can directly obtain the static pressure value after multi-point averaging.

[0058] In this embodiment, the plurality of pitot tubes 300 may be arranged in various forms for testing the total pressure value and the static pressure value at different points.

[0059] (1) A first arrangement of the plurality of pitot tubes 300 : The plurality of pitot tubes 300 are arranged in a circumferential manner at intervals within the housing 100 .

[0060] (2) Second arrangement of multiple pitot tubes 300: Multiple pitot tubes 300 are arranged in a rectangular array (not shown in the drawings). In this structural form, multiple pitot tubes 300 can be arranged in a rectangular array structure in the housing 100 through a connecting plate.

[0061] In the first and second arrangements of the plurality of pitot tubes 300 , a plurality of rectifying plates 110 are provided in the housing 100 , and the plurality of rectifying plates 110 divide the space in the housing 100 into a plurality of rectifying areas 120 . The pitot tubes 300 are connected to the rectifying plates 110 , and at least one pitot tube 300 is arranged in each rectifying area 120 .

[0062] Among them, in the first arrangement, Figure 5 and Figure 6 As shown, specifically, the plurality of fairing areas 120 are arranged in a circumference, and a pitot tube 300 is arranged in each fairing area 120 , and the pitot tubes 300 in the plurality of fairing areas 120 are arranged in a circumferential manner at intervals in the housing 100 .

[0063] For example, a plurality of pitot tubes 300 are arranged in a M shape or a cross shape.

[0064] In the second arrangement form, one implementation is: a plurality of rectifying areas 120 are arranged in a grid; or, a plurality of rectifying plates 110 are arranged in parallel, and a plurality of pitot tubes 300 are arranged on each rectifying plate 110 at intervals, and a plurality of rows are arranged in total.

[0065] It should be noted that there is no limit to the number of the plurality of pitot tubes 300 , for example, four, six, eight, etc.

[0066] In this embodiment, the first arrangement of the plurality of pitot tubes 300 will be described in detail, and the specific description is as follows.

[0067] In one structural form, a mounting member 130 is disposed in the housing 100 , and one end of each rectifier plate 110 is snap-fitted to the housing 100 , and the other end is snap-fitted to the mounting member 130 .

[0068] In this embodiment, the first pressure taking device 400 has a first cavity, and a first air inlet and a first air outlet are provided on the side wall of the first pressure taking device 400. The first air inlet is connected to the total pressure outlet 320 through a first pipeline, and the first air outlet is connected to the air volume meter 200 through a pipeline; the second pressure taking device 500 has a second cavity, and a second air inlet and a second air outlet are provided on the side wall of the second pressure taking device 500. The second air inlet is connected to the static pressure outlet 340 through a pipeline, and the second air outlet is connected to the air volume meter 200 through a second pipeline.

[0069] In one structural form, the first pressure taking device 400 and the second pressure taking device 500 are both trough structures with one end open; the first opening of the first pressure taking device 400 is connected to the mounting member 130, and the first opening is blocked by the mounting member 130 to form a first cavity; the first pressure taking device 400 is clamped to the second pressure taking device 500, and can block the second opening of the second pressure taking device 500 to form a second cavity.

[0070] The first pipeline passes through the second pressure taking device 500 from the rear of the second pressure taking device 500 and is communicated with the first air outlet on the first pressure taking device 400 .

[0071] Please continue to refer to Figure 7 The mounting member 130 is configured as a long rod-shaped structure, and its end near the air inlet is configured as a cone. The advantage of this configuration is that it can reduce resistance, so that the direction of the airflow coming from the front of the cone does not change too drastically, thereby ensuring the test effect.

[0072] Among them, a first boss is provided at the end of the mounting member 130 away from the cone, and the first boss is inserted into the first opening of the first pressure taking device 400 to achieve a clamping connection between the two; a second boss is provided at one end of the first pressure taking device 400 away from the mounting member 130, and the second boss is inserted into the second opening of the second pressure taking device 500 to achieve a clamping connection between the two.

[0073] It should be noted that the positions of the first pressure taking device 400 , the second pressure taking device 500 and the mounting member 130 and the connection forms therebetween can be various and are not limited to the specific structural forms described above.

[0074] In this embodiment, if Figure 3 As shown, the first pressure device 400, the second pressure device 500 and the mounting member 130 are coaxially arranged, and the first pressure device 400 is located between the second pressure device 500 and the mounting member 130; the distance between the second pressure device 500 and the plane where the air inlet is located is 80-100 mm.

[0075] Preferably, the distance between the second pressure taking device 500 and the plane where the air inlet is located is 100 mm, so as to adapt to the oil net structure or the inverted triangle structure in the smoke collecting chamber of the top suction range hood 600.

[0076] On the basis of the above embodiment, the housing 100 is a rectangular cylindrical structure with an air inlet and an air outlet arranged opposite to each other, and the size of the air volume detection device should be slightly larger than the size of the oil net, specifically a square structure, and the inner diameter size of the housing 100 is 340mm×340mm. Of course, other structural forms are also possible, as long as the structural forms that can meet the requirements of air volume testing are within the protection scope of the present invention.

[0077] In this embodiment, considering that the test site of the air volume test device is mostly a range hood in the user's home, since the range hood is limited to the stove below, generally 650-750mm, the height of the housing 100 should also be limited. At the same time, in order to ensure stable airflow and accurate measurement, a certain margin should be left at the air inlet front end of the housing 100. At the same time, considering factors such as the operation of the tester, the height of the housing 100 is 250-350mm. As a preferred embodiment, the height of the housing 100 is 250mm (see Figure 1 ).

[0078] It should be noted that the above-mentioned air volume test device is mainly used for the top suction range hood 600, and is used to test the actual air volume of the top suction range hood 600 when it is in use. Figure 8 Install as shown.

[0079] The working process of the air volume test device is:

[0080] The air outlet of the shell 100 is installed on the top-suction range hood 600. Since the size of the air volume detection device (i.e. the size of the shell 100) is slightly larger than the size of the oil net of the top-suction range hood 600, there will be no air leakage between the two. Under the action of the fan in the top-suction range hood 600, the air flow enters from the air inlet of the shell 100, and a part of the air flow passes through the shell 100 and is finally discharged through the air duct outlet in the top-suction range hood 600. At the same time, a part of the air flow enters the total pressure flow channel through the total pressure inlet 310, and enters the first pressure taking device 400 through the total pressure outlet 320, so that the air volume meter 200 obtains the corresponding total pressure value. At the same time, the air flow inside the shell 100 enters the static pressure flow channel through the static pressure inlet 330 perpendicular to the direction of the incoming air flow, and enters the second pressure taking device 500 through the static pressure outlet 340, so that the air volume meter 200 obtains the corresponding static pressure value.

[0081] This embodiment also provides another air volume test device, which is different from the above-mentioned air volume test device in that: Fig. 9 As shown, a trumpet-shaped interface 700 is provided at the air outlet, wherein the opening size of the trumpet-shaped interface 700 can be adjusted.

[0082] Among them, this kind of air volume test device can be used according to Fig.10 The device shown is applied to a side-suction range hood 800 to test the actual air volume of the side-suction range hood 800 when in use. It can also be applied to other range hoods, such as: a top-suction range hood 600; and the working process of this air volume testing device is the same as above, which will not be repeated here.

[0083] One implementation method in which the opening size of the trumpet-shaped interface 700 can be adjusted is as follows: the body of the trumpet-shaped interface 700 is cloth; a pull rope capable of adjusting the opening size is provided at the opening of the trumpet-shaped interface 700, and the trumpet-shaped interface 700 is sealed to the inlet of the range hood to be tested through a connector.

[0084] The fabric may be canvas.

[0085] In actual operation, the tester wraps the entire range hood with canvas, tightens the opening of the trumpet-shaped interface 700 by pulling a rope, and further seals the opening with the air inlet of the range hood with tape, so that the air outlet of the air volume test device should face the air inlet of the range hood as much as possible. The operation diagram of the side suction machine is as follows.

[0086] This embodiment also provides a testing method using the above-mentioned air volume testing device, comprising the following steps:

[0087] Test environment temperature T and test environment atmospheric pressure S, according to the air density calculation formula Calculate the air density ρ in the current environment;

[0088] The total pressure value P in the first pressure collector 400 is obtained by the wind pressure sensor. t and the static pressure value P in the second pressure collector 500 s , where P t With P s The difference is P, according to the formula P = KQ 2 ρ, calculate the air volume Q, where K is a constant.

[0089] in, Fig.11 It is the operating system of the air volume meter 200, which includes a power module, a button module, a micro-wind pressure sensor, a temperature and humidity sensor, an air pressure sensor, an air volume meter control module and a LCD display module, etc. This structure has not been improved relative to the prior art, and its specific structure and working principle are clear and achievable to technicians in this field, so they will not be repeated here.

[0090] Among them, the selection of K value can be carried out through a higher precision air volume test device for value selection and calibration. Generally, the range hood to be tested can be placed on the air volume test bench, with the outlet connected to the air volume test bench and the inlet connected to the air volume detection device. Since the air inlet volume is equal to the air outlet volume, the K value can be inferred according to the formula.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air volume test device for a range hood, characterized in that: include: A housing (100) and an air volume meter (200), wherein the housing (100) has an air inlet and an air outlet, and a plurality of pitot tubes (300) are arranged inside the housing (100); Each of the pitot tubes (300) comprises a total pressure flow channel and a static pressure flow channel that are not connected to each other, the total pressure inlet (310) of the total pressure flow channel faces the air inlet, and the axis of the total pressure inlet (310) is parallel to the air flow direction, and the total pressure outlets (320) of the plurality of total pressure flow channels are all connected to a first pressure taking device (400), and the first pressure taking device (400) is connected to the air volume meter (200); The axis of the static pressure inlet (330) of the static pressure flow channel is perpendicular to the airflow direction, and the static pressure outlets (340) of the plurality of static pressure flow channels are all connected to the second pressure taking device (500), and the second pressure taking device (500) is connected to the air volume meter (200); A trumpet-shaped interface (700) is provided at the air outlet, and the opening size of the trumpet-shaped interface (700) is adjustable; The body of the trumpet-shaped interface (700) is made of cloth; The trumpet-shaped interface (700) is provided with a drawstring capable of adjusting the size of the opening at its opening, and the trumpet-shaped interface (700) is sealed with the inlet of the range hood to be tested via a connecting piece, and the opening is used to be sealed with the range hood via an adhesive tape; A mounting member (130) and a plurality of rectifying plates (110) are provided in the housing (100); one end of each rectifying plate (110) is clamped to the housing (100), and the other end is clamped to the mounting member (130); The mounting member (130) is configured as a long rod-shaped structure, and the end portion thereof close to the air inlet is configured as a cone; The first pressure taking device (400) and the second pressure taking device (500) are both trough structures with one end open; The first opening of the first pressure taking device (400) is connected to the mounting member (130), and the first opening is blocked by the mounting member (130); The first pressure taking device (400) is clamped to the second pressure taking device (500) and is capable of blocking the second opening of the second pressure taking device (500); The first pressure taking device (400), the second pressure taking device (500) and the mounting member (130) are coaxially arranged, and the first pressure taking device (400) is located between the second pressure taking device (500) and the mounting member (130).

2. The air volume testing device according to claim 1, characterized in that: The first pressure taking device (400) has a first cavity, and a first air inlet and a first air outlet are provided on a side wall of the first pressure taking device (400), the first air inlet is connected to the total pressure outlet (320) through a pipeline, and the first air outlet is connected to the air volume meter (200) through a pipeline; The second pressure taking device (500) has a second cavity, and a second air inlet and a second air outlet are provided on a side wall of the second pressure taking device (500); the second air inlet is connected to the static pressure outlet (340) via a pipeline, and the second air outlet is connected to the air volume meter (200) via a pipeline.

3. The air volume testing device according to claim 1, characterized in that: A plurality of pitot tubes (300) are arranged in a circumferential manner and spaced apart in the housing (100); Alternatively, a plurality of the pitot tubes (300) are arranged in a rectangular array.

4. The air volume testing device according to claim 3, characterized in that: The plurality of rectifying plates (110) divide the space inside the housing (100) into a plurality of rectifying areas (120); the pitot tube (300) is connected to the rectifying plates (110), and at least one pitot tube (300) is arranged in each rectifying area (120).

5. The air volume testing device according to claim 4, characterized in that: The plurality of straightening areas (120) are arranged in a circumferential manner, and a pitot tube (300) is arranged in each straightening area (120). The pitot tubes (300) in the plurality of straightening areas (120) are arranged in a circumferential manner at intervals in the housing (100).

6. The air volume testing device according to claim 5, characterized in that: The distance between the second pressure taking device (500) and the plane where the air inlet is located is 80-100 mm.

7. The air volume test device according to any one of claims 1 to 6, characterized in that: The housing (100) is a rectangular cylindrical structure in which the air inlet and the air outlet are arranged opposite to each other.

8. The air volume testing device according to claim 1, characterized in that: The height of the housing (100) is 250-350 mm.

9. A testing method using the air volume testing device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Test environment temperature and test environment atmospheric pressure , according to the formula , calculate the air density in the current environment ; The total pressure value in the first pressure sensor is obtained respectively and the static pressure value in the second pressure sensor ,in, and The difference is , according to the formula , calculate the air volume ,in, is a constant.

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