Range hood air volume testing method and air volume testing device

Abstract

The present invention relates to a range hood air volume test method, comprising the following steps: S0, for different orifice plates n, n is the orifice plate number; when the fan is controlled to rotate at a fixed speed R0, under the condition that each orifice plate n is installed in a standard manner, the relationship function between the fan current I0n and the orifice plate number n is I0n=f(n); S1, after replacing the orifice plate i on the air volume test device, i∈n, the fan is controlled to rotate at the fixed speed R0, and the fan current Ii under the current orifice plate i test condition is obtained; S2, calculating ΔIi=|Ii-I0i|; S3, judging whether ΔIi>A, where A is the current deviation threshold; if so, judging that there is a deviation in the installation of the orifice plate i on the air volume test device, otherwise it is considered that the orifice plate i is installed in a standard manner on the air volume test device. The range hood air volume test method can determine the orifice plate positioning deviation, so as to facilitate parameter adjustment during the test process. The present invention also relates to an air volume test device using the range hood air volume test method.

Description

Technical Field

[0001] The invention relates to a range hood air volume testing method and also relates to an air volume testing device applying the range hood air volume testing method. Background Art

[0002] Range hoods are widely used in kitchens. The quality of range hoods is directly related to the performance of the fans installed inside them. The most direct manifestation of the performance of the fans is the air volume of the range hoods. Therefore, the air volume test of range hoods is an important part of the range hood working parameter test.

[0003] The Chinese utility model patent "A Range Hood Air Volume Test Device" with the authorization announcement number CN202024791U (application number 201020691808.6) discloses a range hood test device connected to the range hood for use, including a fairing, a pressure reducing cylinder, a control cabinet and a computer. The fairing is connected to the range hood through an air duct, and the fairing is connected to one end of the pressure reducing cylinder through a diffusion cylinder. The other end of the pressure reducing cylinder is provided with an orifice plate, and at least four sampling points are provided in the pressure reducing cylinder. The sampling points are connected to the control cabinet through a connecting hose, and the control cabinet is connected to the computer through a communication cable. In the process of testing, it is necessary to replace the orifice plate with different apertures, repeatedly measure the instantaneous air pressure value, and input the average value into the computer. The computer analyzes and processes these average values ​​through the internal module to obtain the results. At present, the orifice plate is mainly replaced manually. When the orifice plate is replaced, the center of the circular hole in the orifice plate needs to correspond to the center of the hole in the pressure reducing cylinder. However, manual replacement of the orifice plate will inevitably result in large positioning errors, which will in turn affect the accuracy of the air volume test. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a range hood air volume testing method capable of determining the position deviation of the orifice plate in view of the above-mentioned prior art.

[0005] The first technical problem to be solved by the present invention is to provide a range hood air volume testing method that can automatically adjust test data in the case of orifice plate positioning deviation to obtain accurate fan operating parameters in response to the above-mentioned prior art.

[0006] The third technical problem to be solved by the present invention is to provide an air volume testing device using the aforementioned range hood air volume testing method in response to the above-mentioned prior art.

[0007] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a range hood air volume testing method, characterized in that it comprises the following steps:

[0008] S0, for different orifice plates n, n is the orifice plate number;

[0009] When the fan is controlled to rotate at a fixed speed R0, under the condition that each orifice plate n is installed in a standard manner, the relationship function between the fan current I0n and the orifice plate number n is I0n=f(n);

[0010] S1. After replacing the orifice plate i on the air volume test device, i∈n, the fan is controlled to rotate at a fixed speed R0, and the fan current Ii under the current orifice plate i test condition is obtained;

[0011] S2, calculate ΔIi=|Ii-I0i|;

[0012] S3. Determine whether ΔIi>A, where A is the current deviation threshold; if so, determine that there is a deviation in the installation of the orifice plate i on the air volume test device, otherwise it is considered that the orifice plate i is installed standardly on the air volume test device.

[0013] The technical solution adopted by the present invention to solve the above second technical problem is: initializing the target air volume parameter Q0n and the target static pressure parameter P0n corresponding to each orifice plate;

[0014] After determining the installation condition of the orifice plate i on the air volume test device, when there is a deviation in the installation of the orifice plate i on the air volume test device, the target air volume parameter Q0n' and the target static pressure parameter P0n' corresponding to the corresponding orifice plate are adjusted according to ΔIi;

[0015] Then, for the current orifice plate i, the control starts to test the air volume of the range hood;

[0016] The fan is controlled to work with an initial current Ia. After the fan speed stabilizes, the current air volume value Q and static pressure value P are detected and obtained. The air volume difference ΔQ of Q relative to the target air volume parameter of the current orifice plate i is calculated. The static pressure difference ΔP of P relative to the target static pressure parameter of the current orifice plate i is calculated. The current and speed of the fan are controlled and adjusted until ΔQ and ΔP reach the corresponding allowable error range, and then the fan current and speed parameters corresponding to the current orifice plate i are obtained.

[0017] Preferably, the relationship between ΔIi and Q0n' and P0n' is: Q0n'=Q0n+ΔIi*Mn, where Mn is a constant, and Mn is the proportional coefficient for calculating the target air volume preset for orifice plate n; P0n'=P0n+ΔIi*Kn, where Kn is a constant, and Kn is the proportional coefficient for calculating the target static pressure preset for orifice plate n.

[0018] Preferably, I0n=f(n)=K*n+C, wherein K and C are preset constants.

[0019] The technical solution adopted by the present invention to solve the third technical problem is: an air volume test device, comprising a hollow air volume test cylinder and an orifice plate with a circular hole, wherein the first end of the air volume test cylinder is connected to the air outlet of the range hood, and characterized in that: it also comprises a control circuit board, a control screen, a communication module, an air volume sensor and a static pressure sensor arranged on the air volume test cylinder, wherein the control circuit board is respectively connected to the control screen, the communication module, the air volume sensor and the static pressure sensor by electrical signals, and the communication module matches and communicates with the communication module in the range hood;

[0020] The air volume testing device applies the aforementioned range hood air volume testing method.

[0021] In order to realize automatic driving of the orifice plate, a driving mechanism for driving the orifice plate is also included, and the driving mechanism is connected to the control circuit board via an electrical signal.

[0022] In order to facilitate the clamping of the orifice plate, the driving mechanism includes a driving source and a manipulator connected to the driving source, the manipulator includes a driving arm and a clamping claw connected to the end of the driving arm, and the driving source is connected to the control circuit board by electrical signals.

[0023] In order to facilitate the installation of the orifice plate, a magnet is provided on the clamping jaw.

[0024] Preferably, the air volume test tube includes a fairing, a diffuser and a pressure reducing tube connected in sequence, one end of the fairing is connected to the air outlet of the range hood, and the inner diameter of the diffuser gradually increases from the connection end with the fairing to the connection end with the pressure reducing tube.

[0025] Compared with the prior art, the advantages of the present invention are: the range hood air volume testing method of the present invention can effectively identify whether there is a deviation in the installation of the orifice plate on the air volume testing device according to the current value of the fan at a fixed speed R0, and then the tester can readjust the installation position of the orifice plate to the standard state, or adjust the test parameters based on the situation, so as to obtain more accurate test results.

[0026] The air volume testing device using the range hood air volume testing method can effectively detect deviations in the installation of the orifice plate on the air volume testing device, thereby improving the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the air volume testing device in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] The air volume testing device in this embodiment is applied to the air volume testing of a range hood.

[0030] like Figure 1 As shown, the air volume test device includes a hollow air volume test tube 1, an orifice plate 2 with a circular hole in the center, and a driving mechanism 3. It also includes a control circuit board, a control screen, a communication module, an air volume sensor and a static pressure sensor arranged on the air volume test tube 1. The control circuit board is respectively connected with the control screen, the communication module, the air volume sensor, and the static pressure sensor by electrical signals, and the communication module of the air volume test device matches and communicates with the communication module in the range hood. In this way, the control circuit board can transmit signals with the communication module in the range hood through the communication module, so that when the communication module in the range hood receives the control signal, the control module in the range hood controls the fan in the range hood to work based on the control signal, and at the same time, the fan working data obtained by the control module in the range hood can also be transmitted to the control circuit board through the signal connection between the communication module in the range hood and the communication module in the air volume test device, and then the control circuit board realizes the air volume test of the range hood.

[0031] As in the prior art, when testing the air volume of a range hood, it is necessary to replace the orifice plates 2 with different apertures, and these orifice plates 2 are circular orifice plates. In order to facilitate the test, these orifice plates 2 are usually numbered, and then the air volume test of the range hood is performed in sequence for orifice plates 2 with different numbers. Usually, the orifice plates 2 are numbered 0, 1, 2, ... x. In this embodiment, n is used to represent the number of the orifice plate 2, which is referred to as orifice plate n for short, and n is one of 0, 1, 2, ... x.

[0032] The orifice plate 2 is installed on the port at the end of the air volume test tube 1 to perform an air volume test, and then the working data of the oil fume suction fan is obtained according to the test structure test of the orifice plate 2 with different apertures.

[0033] The air volume test tube 1 in this embodiment includes a fairing 11, a diffuser 12 and a pressure reducing tube 13 which are connected in sequence. The first end of the air volume test tube 1 is connected to the air outlet of the range hood, that is, one end of the fairing 11 is connected to the air outlet of the range hood, and the inner diameter of the diffuser 12 gradually increases from the connection end with the fairing 11 to the connection end with the pressure reducing tube 13.

[0034] Specifically, the orifice plate 2 can be manually installed on the air volume test tube 1, specifically installed at the opening of the pressure reducing tube 13. In this embodiment, the orifice plate 2 is installed on the air volume measuring tube 1 by electric means, which can achieve high installation accuracy and minimize the deviation of the center of the orifice plate 2 relative to the air volume measuring tube 1.

[0035] The driving mechanism 3 includes a driving source 31 and a manipulator 32 connected to the driving source 31, and the driving source 32 is connected to the control circuit board by electrical signals, so that the driving source 32 works based on the control signal of the control circuit board. Under the power of the driving source 31, the manipulator 32 can perform three-dimensional movement relative to the air volume test tube 1. The manipulator 32 includes a driving arm 321 and a clamping claw 322 connected to the end of the driving arm 321. The driving arm 321 can be provided with multiple transmission sections as needed, or it can be provided with one transmission section. The clamping claw 322 is fixedly connected to the front end of the driving arm 321. The clamp 322 is used to grab the orifice plate 2. When in use, the orifice plate 2 can be placed in a box body, and a limiting mechanism is set in the box body, so that after the clamp 322 grabs the orifice plate 2, the center of the clamp 322 and the center of the orifice plate 2 are on the same axis. During installation, the position of the clamp 322 relative to the air volume test tube 1 is accurately controlled so that the center of the installed orifice plate 2 is as close to the center of the air volume test tube 1 as possible, thereby making the measurement result more accurate.

[0036] Because the orifice plate 2 is usually made of metal, in order to facilitate the grabbing of the orifice plate 2 and the installation of the orifice plate 2, a magnet can be provided on the outer end surface of the clamping jaw 322, so that the orifice plate 2 can be conveniently adsorbed on the front end of the clamping jaw 322, and the clamping jaw 322 drives the orifice plate 2 to move. The driving mechanism 3 uses the clamping jaw 322 to grab the orifice plate 2, and drives the orifice plate 2 to be installed on the port of the second end of the air volume test cylinder 1, that is, the drive orifice plate 2 is installed on the port of the pressure reducing cylinder 13.

[0037] The air volume test of the range hood is performed by the aforementioned air volume test device, and the air volume test device specifically adopts the following range hood air volume test method to perform air volume test work on the range hood. The range hood air volume test method includes the following steps.

[0038] S0, for different orifice plates n, n is the orifice plate number;

[0039] When the fan in the range hood is controlled to rotate at a fixed speed R0, when each orifice plate n is installed in a standard manner, the relationship function between the fan current I0n and the orifice plate number n is I0n=f(n); the target air volume parameter Q0n and the target static pressure parameter P0n corresponding to each orifice plate are initialized. The target air volume parameter Q0n and the target static pressure parameter P0n are the air volume parameters and static pressure parameters corresponding to the fan achieving the required optimal performance.

[0040] I0n=f(n), the target air volume parameter Q0n and the target static pressure parameter P0n can all be collected and plotted when the center of the orifice plate n and the center of the air volume test tube 1 are completely on the same axis.

[0041] In this embodiment, I0n=f(n)=K*n+C, wherein K and C are preset constants. When orifice plate No. 0 is installed, the air volume test tube 1 is in a fully open state, so C=I00, where I00 is the fan current when the fan in the range hood rotates at a fixed speed R0 when orifice plate No. 0 is installed in a standard manner.

[0042] S1. After replacing the last orifice plate i on the air volume test device, that is, installing the orifice plate i on the port at the second end of the air volume test tube 1, i∈n, control the fan in the range hood to rotate at a fixed speed R0, and obtain the fan current Ii under the current orifice plate i test condition. If the center of the orifice plate i and the center of the air volume test tube 1 are not on the same axis after the orifice plate i is installed on the air volume test device, it will inevitably cause a relative change in the working parameters of the fan in the range hood. In this way, the change in the fan working parameters can be used to determine whether there is a deviation in the installation of the orifice plate i.

[0043] S2. Calculate ΔIi=|Ii-I0i|, and use ΔIi to determine whether there is any deviation in the installation of the orifice plate i on the air volume test device.

[0044] S3, determine whether ΔIi>A, where A is the current deviation threshold, which is the normal fluctuation threshold of the fan current under the standard normal state of orifice plate i; if so, it is determined that there is a deviation in the installation of orifice plate i on the air volume test device, and S4 is performed accordingly; otherwise, it is considered that the orifice plate i is installed standardly on the air volume test device, and S5 is performed.

[0045] S4. After determining the installation condition of orifice plate i on the air volume test device, when there is a deviation in the installation of orifice plate i on the air volume test device, adjust the target air volume parameter Q0n' and the target static pressure parameter P0n' corresponding to the corresponding orifice plate according to ΔIi; the relationship between ΔIi and Q0n' and P0n' is: Q0n'=Q0n+ΔIi*Mn, where Mn is a constant, and Mn is the proportional coefficient for calculating the target air volume preset for orifice plate n; P0n'=P0n+ΔIi*Kn, where Kn is a constant, and Kn is the proportional coefficient for calculating the target static pressure preset for orifice plate n.

[0046] S5. Then, for the current orifice plate i, the control starts to perform the range hood air volume test.

[0047] Specifically, the range hood air volume test works as follows: the fan is controlled to work with an initial current Ia, and the current air volume value Q and static pressure value P are detected and obtained after the fan speed stabilizes, the air volume difference ΔQ of Q relative to the target air volume parameter of the current orifice plate i is calculated, and the static pressure difference ΔP of P relative to the target static pressure parameter of the current orifice plate i is calculated, and the current and speed of the fan are controlled and adjusted until ΔQ and ΔP reach the corresponding allowable error range, thereby obtaining the fan current and speed parameters corresponding to the current orifice plate i.

[0048] S1 to S5 are performed in a loop until the range hood air volume test is completed when all the orifice plates of the range hood are installed on the air volume test tube 1 .

[0049] The range hood air volume testing method of the present invention can effectively identify whether there is a deviation in the installation of the orifice plate on the air volume testing device according to the current value of the fan at a fixed speed R0. If there is a deviation, a more accurate test result can be obtained by adjusting the test parameters. The air volume testing device using the range hood air volume testing method can effectively detect the situation where there is a deviation in the installation of the orifice plate on the air volume testing device, thereby improving the accuracy of the test results.

Claims

1. A range hood air volume testing method, implemented based on an air volume testing device, characterized in that: The air volume test device comprises a hollow air volume test cylinder (1) and an orifice plate (2) with a circular hole, wherein the first end of the air volume test cylinder (1) is connected to the air outlet of the range hood, and is characterized in that it also comprises a control circuit board, a control screen, a communication module, an air volume sensor and a static pressure sensor arranged on the air volume test cylinder (1), and a driving mechanism (3) for driving the orifice plate (2), wherein the control circuit board is respectively connected to the control screen, the communication module, the air volume sensor, the static pressure sensor, and the driving mechanism (3) by electrical signals, and the communication module communicates with the communication module in the range hood in a matching manner; the air volume test cylinder (1) comprises a fairing (11), a diffuser (12), and a decompression cylinder (13) connected in sequence, wherein one end of the fairing (11) is connected to the air outlet of the range hood, and the inner diameter of the diffuser (12) gradually increases from the end connected to the fairing (11) to the end connected to the decompression cylinder (13); The range hood air volume test method includes the following steps: S0, for different orifice plates n, n is the orifice plate number; When the fan is controlled to rotate at a fixed speed R0, when each orifice plate n is installed in a standard manner, the relationship function between the fan current I0n and the orifice plate number n is I0n=f(n); initialize the target air volume parameter Q0n and the target static pressure parameter P0n corresponding to each orifice plate; S1. After replacing the orifice plate i on the air volume test device, i∈n, the fan is controlled to rotate at a fixed speed R0, and the fan current Ii under the current orifice plate i test condition is obtained; S2. Calculate ΔIi=|Ii-I0i|; S3, judging whether ΔIi>A, where A is the current deviation threshold; if so, judging that there is a deviation in the installation of the orifice plate i on the air volume test device, otherwise judging that the orifice plate i is installed in the air volume test device in a standard manner; S4. After determining the installation condition of the orifice plate i on the air volume test device, when there is a deviation in the installation of the orifice plate i on the air volume test device, adjust the target air volume parameter Q0n' and the target static pressure parameter P0n' corresponding to the corresponding orifice plate according to ΔIi; S5, then control to start the range hood air volume test for the current orifice plate i; The fan is controlled to work with an initial current Ia. After the fan speed stabilizes, the current air volume value Q and static pressure value P are detected and obtained. The air volume difference ΔQ of Q relative to the target air volume parameter of the current orifice plate i is calculated. The static pressure difference ΔP of P relative to the target static pressure parameter of the current orifice plate i is calculated. The current and speed of the fan are controlled and adjusted until ΔQ and ΔP reach the corresponding allowable error range, and then the fan current and speed parameters corresponding to the current orifice plate i are obtained.

2. The range hood air volume testing method according to claim 1, characterized in that: The relationship between ΔIi and Q0n' and P0n' is: Q0n'=Q0n+ΔIi*Mn, where Mn is a constant and Mn is the proportional coefficient for the target air volume calculated for orifice plate n; P0n'=P0n+ΔIi*Kn, where Kn is a constant and Kn is the proportional coefficient for the target static pressure calculated for orifice plate n.

3. The range hood air volume testing method according to claim 1 or 2, characterized in that: I0n=f(n)=K*n+C, where K and C are preset constants.

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