Automatic measuring equipment for air volume and air pressure of smoke exhaust ventilator

Abstract

The invention discloses automatic measuring equipment for air volume and air pressure of a range hood. Comprising a case, a measuring unit pipe body, an exhaust fan used for measuring negative pressure generated in the measuring unit pipe body, an air volume adjusting module used for adjusting the air volume, and a first air pressure measuring module used for measuring the working air pressure of the range hood, the second air pressure measuring module is used for measuring the air pressure difference between the two sides of the air volume adjusting module, the controller is used for controlling the measuring equipment to work, the exhaust fan is connected to the air outlet of the measuring unit pipe body, negative pressure is generated on the rear section of the measuring unit pipe body, and therefore the range hood better conforms to the actual use scene when being tested; and the tested air volume and air pressure performance curve can reflect the performance of the range hood more accurately.

Description

Technical Field

[0001] The invention belongs to the technical field of range hood measuring equipment, and in particular relates to an automatic measuring device for the air volume and air pressure of a range hood. Background Art

[0002] The range hood is a common kitchen appliance that removes the fumes and odors generated during cooking and keeps the kitchen air clean. Its performance directly affects the indoor air quality and the comfort of the kitchen environment. In order to ensure the safety, effectiveness and durability of the range hood, comprehensive testing is required, so a range hood measurement system is needed.

[0003] The measurement system of the prior art is shown in the Chinese patent application document with patent application number 202210196736.5, which discloses an automatic test system for the performance of a range hood fan. The device mainly includes: a remote-controlled electric valve device, a filter amplifier, a threshold comparison circuit, a wind speed sensor and a temperature sensor, and a pressure gauge; the method adopts a new measurement and control algorithm to measure the air flow rate and pressure, and detect and compensate for the original measured flow value; filtering and other related algorithms are used for the collected sensor signals, and related values ​​are calculated, and then the fan performance under different working conditions can be calculated based on the wind speed, temperature and pipeline parameters measured by the sensor.

[0004] In the automatic test system of the above patent application, one end of the fan test pipe is used to connect the range hood fan to be tested, and the other end is provided with an electric valve, and the cross-sectional opening size of the fan test pipe is adjusted by the electric valve, so as to test the fan performance under different working conditions. However, this test system does not conform to the actual use scenario of the range hood. When the range hood is installed and used, the exhaust port of the range hood is connected to the flue, and there is often a negative pressure in the flue. Therefore, when the range hood is working, the flue connected to the exhaust port is in a negative pressure state. The automatic test system of the prior art does not set a negative pressure environment, and the data of the range hood performance test cannot reflect the performance of the range hood in the actual use scenario. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides an automatic measuring device for the air volume and air pressure of a range hood.

[0006] The technical solution adopted by the present invention to solve its technical problem is: A range hood air volume and pressure automatic measuring device comprises a chassis, a measuring unit pipe body, an exhaust fan for generating negative pressure inside the measuring unit pipe body, an air volume regulating module for regulating the air volume, a first air pressure measuring module for measuring the working air pressure of the range hood, a second air pressure measuring module for measuring the air pressure difference on both sides of the air volume regulating module, and a controller for controlling the operation of the measuring device, wherein the measuring unit pipe body is mounted on the chassis, the exhaust fan is mounted in the chassis, the air outlet of the measuring unit pipe body is connected to the exhaust fan via an air duct, the air inlet of the measuring unit pipe body is used to connect to the range hood to be measured, the exhaust fan, the air volume regulating module, the first air pressure measuring module, and the second air pressure measuring module are all connected to the controller circuit; a measuring air duct connecting the air inlet and the air outlet is provided inside the measuring unit pipe body; the air volume regulating module is mounted inside the measuring unit pipe body, and the air volume regulating module covers the cross section of the measuring air duct.

[0007] In the present invention, the air volume regulating module comprises at least three regulating nozzles, the opening adjustment range and unit opening adjustment amount of each regulating nozzle are different, and the total opening of the air volume regulating module is equal to the sum of the openings of each regulating nozzle.

[0008] In the present invention, the adjusting nozzle includes an air inlet flare, an air outlet cylinder and an adjusting push rod, the air inlet flare is connected to one end of the air outlet cylinder, the air outlet cylinder is provided with an inner cavity for gas to flow through, the outer wall of the air outlet cylinder is provided with a plurality of ventilation holes for gas to flow out, and each group of ventilation holes is arranged at intervals along the axial direction of the air outlet cylinder. A piston is provided at one end of the adjusting push rod, the piston is arranged in the inner cavity, the outer side wall of the piston is close to the inner wall of the air outlet cylinder, the other end of the adjusting push rod extends along the axial direction of the air outlet cylinder and protrudes from the other end of the air outlet cylinder, the other end of the adjusting push rod is provided with a connecting block for connecting the adjusting driving mechanism, and the adjusting push rod drives the connecting block to move axially through the adjusting driving mechanism.

[0009] In the present invention, an observation window is provided on the side wall of the measuring unit tube body, and the observation window is connected to the measuring air duct, and the position of the observation window corresponds to the position of the air volume adjustment module; at least three scale bars are also provided inside the measuring unit tube body, and each adjustment nozzle is equipped with a scale bar, and the scale bars extend along the moving direction of the adjustment push rod, and the outer side wall of the connecting block is provided with a pointer pointing to the scale bar.

[0010] In the present invention, a wind speed sensor is provided at one end of the air outlet connected to the air inlet expansion port, and the regulating nozzle and the wind speed sensor are connected to a controller through a circuit. The controller controls the air volume opening adjustment of the regulating nozzle, and the wind speed signal monitored by the wind speed sensor is transmitted to the controller. The controller obtains the air volume value measured by the range hood by calculating the air volume opening adjustment amount, wind speed and time of the regulating nozzle.

[0011] In the present invention, the measuring unit pipe body includes a range hood flange connecting plate, a front measuring pipe body, a rear measuring pipe body and an exhaust duct connecting section which are connected in sequence, wherein the range hood flange connecting plate is used to connect the range hood to be measured, and the exhaust duct connecting section is used to sleeve the air duct; the first wind pressure measurement module is arranged on the outside of the front measuring pipe body and is connected to the inside of the front measuring pipe body; the air volume adjustment module is arranged between the front measuring pipe body and the rear measuring pipe body, and the second wind pressure measurement module is provided with two wind pressure measurement points, which are respectively arranged on both sides of the air volume adjustment module.

[0012] In the present invention, the first wind pressure measurement module includes a first pressure-taking air pipe, which is arranged around the outside of the front measuring tube body and close to one end of the range hood flange connecting plate, and the first pressure-taking air pipe is connected to the interior of the front measuring tube body.

[0013] In the present invention, the controller circuit is connected to two pressure sensors, one of which is arranged inside the first pressure-taking air pipe to collect the air pressure value of the first pressure-taking air pipe; and the other pressure sensor is exposed to the external air to collect the atmospheric pressure value.

[0014] In the present invention, the second wind pressure measurement module includes a second pressure-taking air pipe and a third pressure-taking air pipe. The second pressure-taking air pipe is arranged around the outside of the front measuring tube body and close to one end of the air volume regulating module. The third pressure-taking air pipe is arranged around the outside of the rear measuring tube body and close to one end of the air volume regulating module. The second pressure-taking air pipe and the third pressure-taking air pipe are respectively connected to the front measuring tube body and the rear measuring tube body.

[0015] In the present invention, the two wind pressure measurement points of the second wind pressure measurement module are respectively arranged in the second pressure-taking air pipe and the third pressure-taking air pipe, so as to respectively collect the wind pressure values ​​inside the second pressure-taking air pipe and the third pressure-taking air pipe and transmit them to the controller.

[0016] The beneficial effects of the present invention are as follows: by connecting an exhaust fan to the air outlet of the measuring unit pipe body, a negative pressure is generated in the rear section of the measuring unit pipe body, so that the range hood test is more in line with the actual usage scenario, and the tested air volume and air pressure performance curve is more accurate; at the same time, by arranging an air volume adjustment module, a first air pressure measurement module and a second air pressure measurement module inside the measuring unit pipe body, the measuring equipment can measure the air pressure increment that the range hood can provide relative to the atmospheric pressure when working, and can also measure the change in air pressure under different air volume resistances, thereby obtaining the performance curve of the range hood, which can accurately reflect the performance of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the measuring device of this embodiment; Figure 2This is a performance curve diagram of air volume and air pressure of a range hood tested by the measuring device of this embodiment; Figure 3 This is a schematic diagram of the installation structure of the exhaust fan in this embodiment; Figure 4 This is a schematic diagram of the internal structure of the air volume adjustment module of this embodiment; Figure 5 This is a schematic diagram of the connection between the controller and various electrical components in this embodiment; Figure 6 This is a schematic diagram of the structure of the nozzle adjustment in this embodiment; Figure 7 This is a schematic diagram of the connection between the controller and various electronic devices in this embodiment; Figure 8 Schematic diagram of the structure of the support plate of this embodiment. DETAILED DESCRIPTION

[0018] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the present invention, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0021] like Figures 1 to 8As shown, this embodiment discloses an automatic measuring device for the air volume and pressure of a range hood, comprising a chassis 1, a measuring unit tube body 2, an exhaust fan 3 for generating negative pressure inside the measuring unit tube body 2, an air volume regulating module 4 for regulating the air volume, a first air pressure measuring module 5 for measuring the working air pressure of the range hood, a second air pressure measuring module 6 for measuring the air pressure difference on both sides of the air volume regulating module 4, and a controller 7 for controlling the operation of the measuring device, wherein the measuring unit tube body 2 is mounted on the chassis 1, and the exhaust fan 3 is mounted on the chassis 1, the air outlet of the measuring unit tube body 2 is connected to the exhaust fan 3 through the air duct 20, the air inlet of the measuring unit tube body 2 is used to connect the range hood to be measured, the exhaust fan 3, the air volume adjustment module 4, the first wind pressure measurement module 5 and the second wind pressure measurement module 6 are all connected to the controller 7 circuit; the measuring unit tube body 2 is provided with a measuring air duct 21 connecting the air inlet and the air outlet; the air volume adjustment module 4 is installed inside the measuring unit tube body 2, and the air volume adjustment module 4 covers the cross section of the measuring air duct 21. The measuring device of this embodiment connects the exhaust fan 3 to the air outlet of the measuring unit pipe body 2 to generate negative pressure in the rear section of the measuring unit pipe body 2, so that the range hood test is more in line with the actual use scenario and the tested air volume and air pressure performance curve is more accurate. At the same time, by arranging the air volume regulating module 4, the first air pressure measuring module 5 and the second air pressure measuring module 6 inside the measuring unit pipe body 2, the measuring device can measure the air pressure increment that the range hood can provide relative to the atmospheric pressure when it is working, and can also measure the change in air pressure under different air volume resistances, so as to obtain the performance curve of the range hood. The performance curve can accurately reflect the performance of the range hood and is not affected by the atmospheric pressure in the air. The air pressure difference on both sides of the air volume regulating module 4 can be used to calculate the influence of different air volume resistances on the performance of the range hood, so that the performance curve of the range hood can be obtained more accurately. In addition, this testing method can realize standardized testing, which is convenient for different testing units to use the same standard for comparison.

[0022] As a preferred embodiment, the air volume regulating module 4 includes at least three regulating nozzles 41, and the opening adjustment range and unit opening adjustment amount of each regulating nozzle 41 are different. The total opening of the air volume regulating module 4 is equal to the sum of the openings of each regulating nozzle 41. The air volume regulating module 4 includes at least one opening adjustment range of 0 to 10 cm 2 And the unit opening adjustment is 1cm 2 Adjustable nozzle 41, an opening adjustment range of 0 ~ 100cm 2 And the unit opening adjustment is 10cm 2 The regulating nozzle 41 and an opening adjustment range of 0 to 1000 cm 2 And the unit opening adjustment is 100cm 2At this time, the opening adjustment range of the air volume adjustment module 4 is 0 to 1110 cm 2 By setting the regulating nozzles 41 with different opening adjustment ranges, the opening adjustment range of the air volume regulating module 4 can be increased and the adjustment accuracy can be guaranteed at the same time, and when the air volume regulating module 4 is adjusted, 1cm 2 , 10cm 2 and 100cm 2 Of course, each regulating nozzle 41 configured in the air volume regulating module 4 can be configured according to the measurement requirements of the measuring equipment so that the regulating range of the air volume regulating module 4 meets the requirements.

[0023] As a preferred embodiment, the regulating nozzle 41 includes an air inlet expansion port 411, an air outlet cylinder 412 and an regulating push rod 413. The air inlet expansion port 411 is connected to one end of the air outlet cylinder 412. The air outlet cylinder 412 is provided with an inner cavity through which gas can flow. The outer wall of the air outlet cylinder 412 is provided with a plurality of groups of ventilation holes 414 through which gas can flow out. Each group of ventilation holes 414 is arranged at intervals along the axial direction of the air outlet cylinder 412. One end of the regulating push rod 413 is provided with a piston 415, which is arranged in the inner cavity. The outer wall of the piston 415 Close to the inner wall of the air outlet cylinder 412, the other end of the adjusting push rod 413 extends along the axial direction of the air outlet cylinder 412 and extends out from the other end of the air outlet cylinder 412. The other end of the adjusting push rod 413 is provided with a connecting block 416 for connecting the adjusting driving mechanism 417. The adjusting push rod 413 drives the connecting block 416 to move axially through the adjusting driving mechanism 417, thereby driving the piston 415 to move axially along the inner cavity, changing the position of the piston 415, and changing the number of ventilation holes 414 in the air outlet cylinder 412, thereby achieving the effect of air volume regulation. Preferably, the ventilation holes 414 are provided with 10 groups, and each group of ventilation holes 414 corresponds to 1 unit opening adjustment amount in the adjusting nozzle 41. When the adjusting nozzle 41 is used to adjust the air volume opening, it is only necessary to push the piston 415 axially to change the position of the piston 415, thereby controlling the connection and closing of the corresponding ventilation hole 414, simplifying the control structure, improving the accuracy, and basically no problem of adjustment failure.

[0024] As a preferred embodiment, in order to facilitate the measurement personnel to observe and determine the adjustment status of the adjustment nozzle 41, the side wall of the measuring unit tube body 2 is provided with an observation window 22, and the observation window 22 is connected to the measurement air duct 21, and the position of the observation window 22 corresponds to the position of the air volume adjustment module 4, so that the measurement personnel can clearly see through the observation window 22 whether the adjustment nozzle 41 is adjusted accordingly, whether the adjustment action is completed, etc.

[0025] As a preferred embodiment, in order to facilitate the measurement personnel to quickly understand the air volume adjustment state of each adjustment nozzle 41, at least three scale bars 8 are further provided inside the measuring unit tube body 2, each adjustment nozzle 41 is equipped with a scale bar 8, the scale bar 8 is extended along the moving direction of the adjustment push rod 413, and the outer wall of the connecting block 416 is provided with a pointer 9 pointing to the scale bar 8. The measurement personnel can see the position of the scale bar 8 pointed to by the pointer 9 corresponding to each adjustment nozzle 41 through the observation window 22, and accurately read the air volume adjustment state of the adjustment nozzle 41.

[0026] As a preferred embodiment, a wind speed sensor 10 is provided at one end of the air outlet 412 connected to the air inlet expansion port 411, and the regulating nozzle 41 and the wind speed sensor 10 are both connected to the controller 7 through a circuit. The controller 7 controls the air volume opening adjustment of the regulating nozzle 41, and the wind speed signal monitored by the wind speed sensor 10 is transmitted to the controller 7. The controller 7 obtains the air volume value measured by the range hood by calculating the air volume opening adjustment amount, wind speed and time of the regulating nozzle 41.

[0027] As a preferred embodiment, the measuring unit pipe body 2 includes a range hood flange connecting plate 23, a front measuring pipe body 24, a rear measuring pipe body 25 and an exhaust duct connecting section 26 which are connected in sequence, wherein the range hood flange connecting plate 23 is used to connect the range hood to be measured, and the exhaust duct connecting section 26 is used to socket the air duct 20; the first wind pressure measurement module 5 is arranged on the outside of the front measuring pipe body 24 and is connected to the inside of the front measuring pipe body 24; the air volume adjustment module 4 is arranged between the front measuring pipe body 24 and the rear measuring pipe body 25, and the second wind pressure measurement module 6 is provided with two wind pressure measurement points, which are respectively arranged on both sides of the air volume adjustment module 4, so as to measure the pressure difference after the gas passes through the air volume adjustment module 4, and calculate the change in the wind pressure performance of the range hood under different resistance conditions controlled by the air volume adjustment module 4.

[0028] As a preferred embodiment, the first wind pressure measurement module 5 includes a first pressure air pipe 51, which is arranged around the outside of the front measuring tube body 24 and close to one end of the range hood flange connecting plate 23, and the first pressure air pipe 51 is connected to the interior of the front measuring tube body 24; the controller 7 circuit is connected to two pressure sensors, one of which is arranged inside the first pressure air pipe 51, for collecting the air pressure value of the first pressure air pipe 51; the other pressure sensor is exposed to the outside air, for collecting the atmospheric pressure value, and by comparing the air pressure value of the first pressure air pipe 51 with the atmospheric pressure value, the wind pressure increment that the range hood can provide relative to the atmospheric pressure when working can be calculated.

[0029] As a preferred embodiment, the second wind pressure measurement module 6 includes a second pressure air pipe 61 and a third pressure air pipe 62. The second pressure air pipe 61 is arranged around the outer side of the front measuring tube body 24 and close to one end of the air volume regulating module 4. The third pressure air pipe 62 is arranged around the outer side of the rear measuring tube body 25 and close to one end of the air volume regulating module 4. The second pressure air pipe 61 and the third pressure air pipe 62 are respectively connected to the front measuring tube body 24 and the rear measuring tube body 25. The two wind pressure measurement points of the second wind pressure measurement module 6 are respectively arranged in the second pressure air pipe 61 and the third pressure air pipe 62, so as to collect the wind pressure values ​​inside the second pressure air pipe 61 and the third pressure air pipe 62 respectively, and transmit them to the controller 7. Through calculation, it can be known that the wind pressure performance change curve of the range hood under different resistance conditions.

[0030] As a preferred embodiment, in order to facilitate the installation and fixation of the measuring unit tube body 2, a plurality of support plates 30 are provided at the bottom of the measuring unit tube body 2, and the plurality of support plates 30 are arranged at intervals along the axial direction of the measuring unit tube body 2. The top of the support plate 30 is an arc structure 301 that fits with the outer side wall of the measuring unit tube body 2, and the bottom of the support plate 30 is a support plate surface 302 bent along a horizontal plane, and a vertical support plate surface 303 is provided between the arc structure 301 and the support plate surface 302. By providing the support plates 30, the measuring unit tube body 2 can be stably installed on the chassis 1 or the ground, thereby ensuring that the data of the air volume device is stable during measurement, and further ensuring the accuracy of the range hood measurement data.

[0031] As a preferred embodiment, in order to further optimize the space utilization at the top of the measuring unit tube body 2, a storage platform 40 is fixedly provided at the top of the measuring unit tube body 2, and the instruments required for measurement or the products to be tested can be placed on the storage platform 40, which is convenient for observing test data or conducting product testing. The storage platform 40 includes a storage plate 401 and a plurality of support frames 402, and the plurality of support frames 402 are arranged at intervals along the axial direction of the measuring unit tube body 2, the bottom of the support frame 402 is fixed to the outer wall of the top of the measuring unit tube body 2, and the top of the support frame 402 is fixed to the bottom of the storage plate 401. In order to facilitate processing, the structure of the support frame 402 is the same as that of the support plate 30, and it only needs to be installed and fixed relatively up and down during installation, which reduces the difficulty of installing the measuring equipment.

[0032] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means belongs to the protection scope of the present invention.

Claims

1. An automatic measuring device for the air volume and pressure of a range hood, characterized by: The invention comprises a case (1), a measuring unit tube body (2), an exhaust fan (3) for generating negative pressure inside the measuring unit tube body (2), an air volume regulating module (4) for regulating the air volume, a first air pressure measuring module (5) for measuring the working air pressure of the range hood, a second air pressure measuring module (6) for measuring the air pressure difference on both sides of the air volume regulating module (4), and a controller (7) for controlling the operation of the measuring device, wherein the measuring unit tube body (2) is mounted on the case (1), the exhaust fan (3) is mounted in the case (1), and the measuring unit tube body (2) is provided with a first air pressure measuring module (5) for measuring the working air pressure of the range hood, and a second air pressure measuring module (6) for measuring the air pressure difference on both sides of the air volume regulating module (4) is provided with a second air pressure measuring module (6) for measuring the air pressure difference on both sides of the air volume regulating module (4), and a controller (7) for controlling the operation of the measuring device, wherein the measuring unit tube body (2) is mounted on the case (1), the exhaust fan (3) is mounted in the case (1), and the measuring unit tube body (2) is provided with a second air pressure measuring module (6) for measuring the air pressure difference on both sides of the air volume regulating module (4). The air outlet is connected to the exhaust fan (3) via an air duct (20); the air inlet of the measuring unit pipe body (2) is used to connect to the range hood to be tested; the exhaust fan (3), the air volume regulating module (4), the first air pressure measuring module (5) and the second air pressure measuring module (6) are all connected to the controller (7) circuit; a measuring air duct (21) connecting the air inlet and the air outlet is provided inside the measuring unit pipe body (2); the air volume regulating module (4) is installed inside the measuring unit pipe body (2); the air volume regulating module (4) covers the cross section of the measuring air duct (21).

2. The automatic measuring device for air volume and air pressure of a range hood according to claim 1, characterized in that: The air volume regulating module (4) comprises at least three regulating nozzles (41), the opening adjustment range and unit opening adjustment amount of each regulating nozzle (41) are different, and the total opening of the air volume regulating module (4) is equal to the sum of the openings of each regulating nozzle (41).

3. The automatic measuring device for air volume and air pressure of a range hood according to claim 2, characterized in that: The regulating nozzle (41) comprises an air inlet expansion port (411), an air outlet cylinder (412) and an regulating push rod (413); the air inlet expansion port (411) is connected to one end of the air outlet cylinder (412); an inner cavity through which gas can flow is provided in the air outlet cylinder (412); a plurality of groups of ventilation holes (414) through which gas can flow out are provided on the outer wall of the air outlet cylinder (412); each group of ventilation holes (414) is spaced apart along the axial direction of the air outlet cylinder (412); a piston is provided at one end of the regulating push rod (413); (415), the piston (415) is arranged in the inner cavity, the outer wall of the piston (415) is in close contact with the inner wall of the air outlet tube (412), the other end of the adjusting push rod (413) extends along the axial direction of the air outlet tube (412) and protrudes from the other end of the air outlet tube (412), and the other end of the adjusting push rod (413) is provided with a connecting block (416) for connecting to the adjusting drive mechanism (417), and the adjusting push rod (413) drives the connecting block (416) to move along the axial direction through the adjusting drive mechanism (417).

4. The automatic measuring device for air volume and air pressure of a range hood according to claim 3, characterized in that: An observation window (22) is provided on the side wall of the measuring unit tube body (2), the observation window (22) being connected to the measuring air duct (21), and the position of the observation window (22) corresponds to the position of the air volume adjustment module (4); at least three scale bars (8) are also provided inside the measuring unit tube body (2), each adjustment nozzle (41) is provided with a scale bar (8), the scale bar (8) is extended along the moving direction of the adjustment push rod (413), and a pointer (9) pointing to the scale bar (8) is provided on the outer side wall of the connecting block (416).

5. The automatic measuring device for air volume and air pressure of a range hood according to claim 3, characterized in that: A wind speed sensor (10) is provided at one end of the air outlet tube (412) connected to the air inlet expansion port (411); the regulating nozzle (41) and the wind speed sensor (10) are both connected to a controller (7) via a circuit; the controller (7) controls the air volume opening adjustment of the regulating nozzle (41); a wind speed signal monitored by the wind speed sensor (10) is transmitted to the controller (7); and the controller (7) calculates the air volume value measured by the range hood through the air volume opening adjustment amount of the regulating nozzle (41), the wind speed and the time.

6. The automatic measuring device for air volume and air pressure of a range hood according to claim 1, characterized in that: The measuring unit pipe body (2) comprises a range hood flange connection plate (23), a front measuring pipe body (24), a rear measuring pipe body (25) and an exhaust pipe connection section (26) which are connected in sequence, wherein the range hood flange connection plate (23) is used to connect the range hood to be measured, and the exhaust pipe connection section (26) is used to sleeve the air pipe (20); the first wind pressure measurement module (5) is arranged outside the front measuring pipe body (24) and is connected to the inside of the front measuring pipe body (24); the air volume adjustment module (4) is arranged between the front measuring pipe body (24) and the rear measuring pipe body (25); the second wind pressure measurement module (6) is provided with two wind pressure measurement points, and the two wind pressure measurement points are respectively arranged on both sides of the air volume adjustment module (4).

7. The automatic measuring device for air volume and air pressure of a range hood according to claim 6, characterized in that: The first wind pressure measurement module (5) comprises a first pressure-taking air pipe (51), the first pressure-taking air pipe (51) being arranged around the outside of the front measuring tube body (24) and close to one end of the range hood flange connection plate (23), and the first pressure-taking air pipe (51) being connected to the interior of the front measuring tube body (24).

8. The automatic measuring device for air volume and air pressure of a range hood according to claim 7, characterized in that: The controller (7) circuit is connected to two pressure sensors, one of which is arranged inside the first pressure-taking air pipe (51) and is used to collect the air pressure value of the first pressure-taking air pipe (51); and the other pressure sensor is exposed to the external air and is used to collect the atmospheric pressure value.

9. The automatic measuring device for air volume and air pressure of a range hood according to claim 6, characterized in that: The second wind pressure measurement module (6) comprises a second pressure-taking air pipe (61) and a third pressure-taking air pipe (62); the second pressure-taking air pipe (61) is arranged around the outside of the front measuring tube body (24) and close to one end of the wind volume regulating module (4); the third pressure-taking air pipe (62) is arranged around the outside of the rear measuring tube body (25) and close to one end of the wind volume regulating module (4); the second pressure-taking air pipe (61) and the third pressure-taking air pipe (62) are respectively connected to the front measuring tube body (24) and the rear measuring tube body (25).

10. The automatic measuring device for air volume and air pressure of a range hood according to claim 9, characterized in that: The two wind pressure measurement points of the second wind pressure measurement module (6) are respectively arranged in the second pressure-taking air pipe (61) and the third pressure-taking air pipe (62), so as to respectively collect the wind pressure values ​​inside the second pressure-taking air pipe (61) and the third pressure-taking air pipe (62), and transmit them to the controller (7).

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