Noise control methods, media and electrical equipment for fan systems

Abstract

This invention relates to a noise control method, medium, and electrical equipment for a fan system. It calculates the noise difference between the average noise value and the total noise value within one-third octave bands of the noise frequency range at the motor's operating position. When this noise difference exceeds a preset noise difference threshold, and the current value of the area of ​​each sub-inlet area at the volute's rear cover is greater than or equal to the initial value of the corresponding sub-inlet area area, the absolute value of the noise difference between the average total noise value within one-third octave bands of the noise frequency range and the obtained average noise value is calculated. When this absolute value exceeds a preset threshold, all noise frequency bands exceeding the average total noise value within the sub-inlet area are taken as the total frequency range of the sensitive frequency band. Noise reduction is then applied to each sub-inlet area sequentially within the preset total frequency range of the sensitive frequency band, thereby enabling real-time detection of noise in the inlet area and targeted noise reduction.

Description

Technical Field

[0001] This invention relates to the field of household appliances, and more particularly to a method, medium, and electrical equipment for controlling noise in a fan system. Background Technology

[0002] Integrated cooktops are household appliances that combine the functions of a range hood, cooktop, and disinfection cabinet in one unit, and are popular among users because they save kitchen space.

[0003] The existing integrated stove's range hood system mainly consists of an air duct and a fan system. The air duct includes front and rear panels, left and right side panels, a bottom plate, and a top cover. The fan system includes a motor, which is mounted on the front and rear panels via a motor bracket. The air intake of the range hood system is generally either front-to-back or top-to-bottom. After the power is turned on, the fan system's motor drives the impeller to rotate at high speed, drawing the fumes into the air duct. Simultaneously, an air pressure difference is created between the inside and outside of the air inlet and outlet, causing the fumes to rotate and accelerate along with the air inside the volute, before being exhausted through the flue to a common flue or outdoors. During the fume extraction process, some high-temperature oil particles in the fumes are thrown onto the inner wall of the volute by the centrifugal force of the impeller, condensing into oil droplets. These droplets then flow back to the oil collection device on the bottom plate under gravity.

[0004] However, due to the limited internal space of integrated cooktops, the front-to-back or top-to-bottom dimensions of integrated cooktops are constantly being compressed, resulting in cramped space in the rear or lower air intake area of ​​the range hood system, obstructed airflow, and noise or even abnormal sounds.

[0005] Chinese invention patent application CN111456946A discloses a centrifugal fan and an oil fume purification device. The centrifugal fan includes a volute, a motor bracket, an impeller, and an external rotor motor. Air inlets are located on opposite sides of the volute. The impeller is housed within the volute and includes a mounting plate and multiple blades arranged around its circumference. The motor bracket is mounted at one of the air inlets of the volute. The external rotor motor includes a stator and a rotor rotatably disposed around the stator. The end face of the stator is fixedly connected to the motor bracket, and the rotor is fixedly connected to the mounting plate. This centrifugal fan can reduce its size, thus preventing blockage of the air duct and increasing its airflow.

[0006] However, the aforementioned invention patent application CN111456946A has shortcomings: it cannot perform real-time noise detection for each air intake area of ​​the fan system, so it cannot perform targeted noise reduction based on the noise situation of the air intake area. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is to provide a method for controlling the noise of a fan system, which is in contrast to the above-mentioned prior art.

[0008] The second technical problem to be solved by the present invention is to provide a readable storage medium. This readable storage medium stores a computer program, which, when executed by a processor, implements the aforementioned wind turbine system noise control method.

[0009] The third technical problem to be solved by the present invention is to provide an electrical device. This electrical device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the aforementioned fan system noise control method.

[0010] The technical solution adopted by this invention to solve the first technical problem is: a noise control method for a wind turbine system, characterized by comprising the following steps:

[0011] Step 1: Collect the noise frequency range at the location of the motor running at the target operating speed selected by the user, and obtain the one-third octave band spectrum of the noise within the noise frequency range; wherein, the fan system includes a motor, an impeller and a volute, the motor is mounted on the rear cover of the volute through a motor bracket and multiple sub-air intake areas are formed on the rear cover of the volute.

[0012] Step 2: Calculate the average noise value and total noise value of the motor in the frequency band corresponding to the obtained one-third octave band spectrum, and calculate the noise difference between the total noise value and the average noise value.

[0013] Step 3: Make a judgment based on the obtained noise difference value and the preset noise difference threshold:

[0014] If the noise difference is greater than or equal to the preset noise difference threshold, proceed to step 4; otherwise, determine that the motor is operating normally and proceed to step 1.

[0015] Step 4: Detect the current value of the area of ​​each sub-air intake area at the rear cover of the volute;

[0016] Step 5: Compare the current value of the detected area of ​​each sub-air inlet area with the corresponding initial value of the sub-air inlet area.

[0017] If the current value of the area of ​​each sub-air intake area is greater than or equal to the initial value of the area of ​​its corresponding sub-air intake area, proceed to step 6; otherwise, clean the volute and proceed to step 4.

[0018] Step 6: Collect the noise frequency range of each sub-air intake area under the current target operating level and the noise one-third octave spectrum within the corresponding noise frequency range.

[0019] Step 7: Calculate the total average noise value of all sub-inlet areas within the frequency band corresponding to the one-third octave band spectrum collected, and calculate the absolute value of the noise difference between the total average noise value and the obtained average noise value.

[0020] Step 8: Make a judgment based on the absolute value of the obtained noise difference and the preset threshold:

[0021] If the absolute value of the noise difference is greater than the preset threshold, proceed to step 9; otherwise, proceed to step 6.

[0022] Step 9: Extract all frequency segments corresponding to noise exceeding the average total noise value in each sub-air intake area as the sensitive frequency segments of the corresponding sub-air intake area, and take all extracted sensitive frequency segments as the total frequency range of sensitive frequency segments of all sub-air intake areas.

[0023] Step 10: Compare the total frequency range of the sensitive frequency band with the preset total frequency range of the sensitive frequency band.

[0024] When the total frequency range of the sensitive frequency band is within the preset total frequency range of the sensitive frequency band, noise reduction measures are implemented for each sub-air intake area in sequence; otherwise, it is determined that there is abnormal noise at the rear cover of the motor bracket, and a maintenance prompt is issued.

[0025] Improvedly, in the noise control method for the fan system, the motor bracket includes:

[0026] The left bracket is located on the left side of the rear cover of the volute, and its two ends are fixed in the positioning grooves of the rear cover of the volute.

[0027] The right bracket is located on the right side of the rear cover of the volute, and its two ends are fixed in the positioning grooves of the rear cover of the volute.

[0028] The disc support is fixed to the left and right supports;

[0029] The first end of the left side bracket is fixed to the left bracket, and the second end of the left side bracket is fixed to the left side of the volute rear cover.

[0030] The first end of the right side bracket is fixed to the right bracket, and the second end of the right side bracket is fixed to the right side of the volute rear cover.

[0031] Furthermore, in the noise control method for the fan system, the positioning groove of the volute rear cover is an annular groove formed by an arc segment as a whole.

[0032] Improved, in the noise control method for the wind turbine system, the noise reduction measure is active noise reduction.

[0033] In a further improvement, in the noise control method for the wind turbine system, in step 2, the average noise value of the motor within the frequency band corresponding to the acquired one-third octave band spectrum is calculated as follows:

[0034]

[0035] In step 2, the total noise value of the motor within the frequency band corresponding to the acquired one-third octave band spectrum is calculated as follows:

[0036]

[0037] Among them, SNR n SNR is the average noise value of the motor within the frequency band corresponding to the acquired one-third octave band spectrum, M is the total number of noise values ​​collected when the motor is running at the current target operating gear n, and SNR is the noise level of the motor. m This represents the m-th noise value collected.

[0038] Furthermore, in the noise control method for the fan system, in step 7, the average total noise value of all sub-inlet areas within the frequency band corresponding to the collected one-third octave band spectrum is calculated as follows:

[0039]

[0040] in, This represents the average total noise value of all sub-inlet areas within the frequency band corresponding to the collected one-third octave band spectrum, where K is the total number of all sub-inlet areas. This represents the average noise value of the k-th sub-inlet area within the frequency band corresponding to one-third octave band of the collected spectrum; where:

[0041]

[0042] Where J represents the total number of noise values ​​collected in the k-th sub-air intake area when the motor is running at the current target operating gear n, and snr j Let j be the j-th noise value collected.

[0043] The technical solution adopted by the present invention to solve the second technical problem is: a readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the wind turbine system noise control method described in any one of the claims.

[0044] The technical solution adopted by the present invention to solve the third technical problem is: an electrical device, characterized in that it includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the fan system noise control method described in any one of the claims.

[0045] Furthermore, in this invention, the electrical appliance is an integrated stove.

[0046] Compared with the prior art, the advantages of the present invention are as follows: The noise control method of the fan system of the present invention calculates the noise difference between the average noise value and the total noise value in the frequency band corresponding to one-third octave band spectrum of the noise frequency range at the motor operating position. When the noise difference exceeds a preset noise difference threshold, and when it is determined that the current value of the area of ​​each sub-air intake region at the volute rear cover is greater than or equal to the initial value of the area of ​​its respective sub-air intake region, one-third of the noise in each sub-air intake region is collected in the noise frequency range of the current target operating position. The average total noise value within the frequency band corresponding to the one octave band spectrum is calculated. The absolute value of the noise difference between the average total noise value and the obtained average noise value is calculated. If the absolute value of this noise difference is greater than a preset threshold, all frequency bands corresponding to noise exceeding the average total noise value in the sub-inlet area are extracted as the sensitive frequency bands of the corresponding sub-inlet area and used as the total frequency range of sensitive frequency bands for all sub-inlet areas. When the total frequency range of sensitive frequency bands is within the preset total frequency range of sensitive frequency bands, noise reduction measures are implemented for each sub-inlet area in sequence; otherwise, it is determined that abnormal noise has occurred at the rear cover of the motor bracket, and a maintenance prompt is issued. In this way, not only can the noise at each inlet area of ​​the fan system be detected in real time, but also targeted noise reduction treatment can be carried out based on the noise situation of the inlet area. Attached Figure Description

[0047] Figure 1 This is a flowchart illustrating the noise control method for a wind turbine system in an embodiment of the present invention.

[0048] Figure 2 This is a schematic diagram illustrating the arrangement of the motor bracket and volute in an embodiment of the present invention. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0050] This embodiment provides a method for noise detection in the air intake area of ​​a fan system, specifically for the fan system of an integrated stove. See also... Figure 1 As shown, the noise control method for the wind turbine system in this embodiment includes the following steps:

[0051] Step 1: Collect the noise frequency range at the location of the motor running at the target operating speed selected by the user, and obtain the one-third octave band spectrum of the noise within this noise frequency range; for example, assume that the target operating speed selected by the user is n, 1≤n≤N, where N is the total number of operating speeds of the motor.

[0052] The fan system includes a motor, an impeller, and a volute. The motor is mounted on the rear cover of the volute via a motor bracket, and multiple sub-air intake areas are formed on the rear cover of the volute.

[0053] See Figure 2 As shown, the motor bracket here includes a left bracket 11, a right bracket 12, a disc bracket 13, a left side bracket, and a right side bracket 15. The left bracket 11 is located on the left side of the rear cover of the volute 2, and its two ends are fixed in the positioning groove 20 of the rear cover of the volute 2. The positioning groove 20 is an annular groove formed by arc segments as a whole. The right bracket 12 is located on the right side of the rear cover of the volute 2, and its two ends are fixed in the positioning groove 20 of the rear cover of the volute 2. The disc bracket 13 is fixed on the left side of the volute 2. On bracket 11 and right bracket 12; the first end of the left side bracket 14 is fixed to the left bracket 11, and the second end of the left side bracket 14 is fixed to the left side of the rear cover of the volute 2; the first end of the right side bracket 15 is fixed to the right bracket 12, and the second end of the right side bracket 15 is fixed to the right side of the rear cover of the volute 2; with this arrangement, 6 sub-air intake areas can be formed on the rear cover of the volute, and these 6 sub-air intake areas are respectively marked as sub-air intake area Q1, sub-air intake area Q2, ..., sub-air intake area Q6;

[0054] Step 2: Calculate the average noise value and total noise value of the motor within the frequency band corresponding to the acquired one-third octave spectrum, and calculate the noise difference between the total noise value and the average noise value; it should be noted that acquiring the one-third octave spectrum is a conventional technique in this field, and will not be elaborated here.

[0055] For example, in step 2, the average noise value of the motor within the frequency band corresponding to the obtained one-third octave band spectrum is calculated as follows:

[0056]

[0057] In step 2, the total noise value of the motor within the frequency band corresponding to the obtained one-third octave band spectrum is calculated as follows:

[0058]

[0059] Wherein, SNR is the total noise value of the motor within the frequency band corresponding to the acquired one-third octave band spectrum. SNR is the average noise value of the motor within the frequency band corresponding to the acquired one-third octave band spectrum, M is the total number of noise values ​​collected when the motor is running at the current target operating gear n, and SNR is the noise level of the motor. m This represents the m-th noise value collected.

[0060] The total noise value (SNR) and the average noise value obtained in step 2 are... The noise difference between them is marked as △1.

[0061] Step 3: Make a judgment based on the obtained noise difference value and the preset noise difference threshold:

[0062] When the noise difference is greater than or equal to the preset noise difference threshold, i.e., Δ1 ≥ Δ TH1 If the motor is determined to be malfunctioning, proceed to step 4; otherwise, if the motor is determined to be malfunctioning, proceed to step 1; where △ TH1 The preset noise difference threshold is used;

[0063] Step 4: Detect the current value of the area of ​​each sub-air intake area at the rear cover of the volute;

[0064] Step 5: Compare the current value of the detected area of ​​each sub-air inlet area with the corresponding initial value of the sub-air inlet area.

[0065] When the current value of the area of ​​each sub-air intake area is greater than or equal to the initial value of the area of ​​its corresponding sub-air intake area, it means that there are no excessive oil particles accumulated on the inner wall of the volute corresponding to each sub-air intake area, and proceed to step 6; otherwise, it means that the oil particles accumulated on the inner wall of the volute corresponding to each sub-air intake area have exceeded the standard, affecting the air intake effect, then the volute is cleaned and proceed to step 4.

[0066] Step 6: Collect the noise frequency range of each sub-air intake area under the current target operating level and the noise one-third octave spectrum within the corresponding noise frequency range.

[0067] Step 7: Calculate the total average noise value of all sub-inlet areas within the frequency band corresponding to the one-third octave band spectrum collected, and calculate the absolute value of the noise difference between the total average noise value and the obtained average noise value.

[0068] In step 7, the average total noise value of all sub-inlet areas within the frequency band corresponding to the collected one-third octave band spectrum is calculated as follows:

[0069]

[0070] in, This represents the average total noise value of all sub-inlet areas within the frequency band corresponding to the collected one-third octave band spectrum, where K is the total number of all sub-inlet areas. This represents the average noise value of the k-th sub-inlet area within the frequency band corresponding to one-third octave band of the collected spectrum; where:

[0071]

[0072] Where J represents the total number of noise values ​​collected in the k-th sub-air intake area when the motor is running at the current target operating gear n, and snr j This represents the j-th noise value collected.

[0073] The average total noise value obtained in step 7 Compared with the obtained average noise value The absolute value of the noise difference between them is marked as Δ2.

[0074] Step 8: Make a judgment based on the absolute value of the obtained noise difference and the preset threshold:

[0075] When the absolute value of the noise difference is greater than the preset threshold, i.e., △2>△ TH2 Proceed to step 9; otherwise, proceed to step 6; where △ TH2 The preset threshold;

[0076] Step 9: Extract all frequency bands corresponding to noise exceeding the average total noise value within each sub-inlet air region as the sensitive frequency bands of the corresponding sub-inlet air region, and use all extracted sensitive frequency bands as the total frequency range of sensitive frequency bands for all sub-inlet air regions; assuming the extraction process is as follows:

[0077] The sensitive frequency band corresponding to the first sub-inlet air region Q1 is marked as f(Q1); the sensitive frequency band corresponding to the second sub-inlet air region Q2 is marked as f(Q2); and so on for the sensitive frequency bands corresponding to the other sub-inlet air regions.

[0078] Thus, all the extracted sensitive frequency bands are taken as the total frequency range of sensitive frequency bands in all sub-air intake areas. Then, the total frequency range of sensitive frequency bands is marked as f(Q), f(Q)={f(Q1),f(Q2),f(Q3),f(Q4),f(Q5),f(Q6)};

[0079] Step 10: Compare the total frequency range of the sensitive frequency band with the preset total frequency range of the sensitive frequency band.

[0080] When the total frequency range of the sensitive frequency band is within the preset total frequency range of the sensitive frequency band, noise reduction measures are implemented sequentially for each sub-air intake area; otherwise, it is determined that abnormal noise has occurred at the rear cover of the motor bracket, and a maintenance prompt is issued. Among these measures, active noise reduction may be used as needed.

[0081] This embodiment provides a readable storage medium. Specifically, the readable storage medium stores a computer program, which, when executed by a processor, implements the aforementioned fan system noise control method. The readable storage medium may include various storage media capable of storing program code, such as a Universal Serial Bus flash drive (USB), a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0082] This embodiment also provides an electrical device. The electrical device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the aforementioned fan system noise control method. For example, the electrical device here is an integrated stove. Of course, it can also be a range hood, depending on the need.

[0083] Although preferred embodiments of the present invention have been described in detail above, it should be clearly understood that various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of noise control for a fan system, the method comprising: The method comprises the following steps: Step 1, collecting the noise frequency range at the position of the motor running at the target running gear selected by the user, and obtaining the noise one-third octave spectrum in the noise frequency range; wherein, the fan system comprises a motor, an impeller and a volute, the motor is installed on the rear cover of the volute through a motor support and forms a plurality of sub-inlet areas on the rear cover of the volute; Step 2, calculating the average noise value and the total noise value of the motor in the frequency range corresponding to the obtained one-third octave spectrum, and calculating the noise difference value between the total noise value and the average noise value; Step 3, judging according to the noise difference value and the preset noise difference value threshold: When the noise difference value is greater than or equal to the preset noise difference value threshold, step 4 is entered; otherwise, it is determined that the motor is running normally, and step 1 is entered; Step 4, detecting the current value of the area of each sub-inlet area at the rear cover of the volute; Step 5, judging the detected current value of the area of each sub-inlet area and the corresponding initial value of the area of each sub-inlet area: When the current value of the area of each sub-inlet area is greater than or equal to the corresponding initial value of the area of each sub-inlet area, step 6 is entered; otherwise, the volute is cleaned, and step 4 is entered; Step 6, respectively collecting the noise frequency range of each sub-inlet area at the current target running gear and the noise one-third octave spectrum in the corresponding noise frequency range; Step 7, calculating the average total noise value of all sub-inlet areas in the frequency range corresponding to the collected one-third octave spectrum, and calculating the absolute value of the noise difference value between the average total noise value and the obtained average noise value; Step 8, judging according to the noise difference value absolute value and the preset threshold: When the noise difference value absolute value is greater than the preset threshold, step 9 is entered; otherwise, step 6 is entered; Step 9, extracting all frequency ranges corresponding to the noise exceeding the average total noise value in each sub-inlet area as the sensitive frequency range of the corresponding sub-inlet area, and extracting all sensitive frequency ranges as the total sensitive frequency range of all sub-inlet areas; Step 10, judging the total sensitive frequency range and the preset total sensitive frequency range: When the total sensitive frequency range is within the preset total sensitive frequency range, noise reduction measures are sequentially performed on each sub-inlet area; otherwise, it is determined that abnormal noise occurs at the rear cover of the motor support, and a maintenance prompt is given.

2. The fan system noise control method of claim 1, wherein, The motor support comprises: A left support (11) located in the left area of the rear cover of the volute (2), both ends of the left support (11) are fixed in the positioning groove (20) of the rear cover of the volute (2); A right support (12) located in the right area of the rear cover of the volute (2), both ends of the right support (12) are fixed in the positioning groove (20) of the rear cover of the volute (2); A disc support (13) fixed on the left support (11) and the right support (12); A left side support (14) with a first end fixed to the left support (11), a second end of the left side support (14) fixed to the left side of the rear cover of the volute (2); A right side edge support (15) is fixed at a first end to the right support (12) and at a second end to a right side of the back cover of the volute (2).

3. The fan system noise control method of claim 2, wherein, The positioning groove (20) of the back cover of the volute (2) is an annular groove formed by a circular arc segment as a whole.

4. The fan system noise control method of claim 1, wherein, The noise reduction measure is active noise reduction.

5. The fan system noise control method of any of claims 1-4, wherein, In step 2, the average noise value of the motor in the frequency range corresponding to the obtained one-third octave spectrum is calculated as follows: In step 2, the total noise value of the motor in the frequency range corresponding to the obtained one-third octave spectrum is calculated as follows: wherein, is the average noise value of the motor in the frequency range corresponding to the obtained one-third octave spectrum, M is the total number of noise values collected for the motor running at the current target operating gear n, SNR m is the mth noise value collected.

6. The fan system noise control method of claim 5, wherein, In step 7, the average total noise value of all sub-inlet areas in the frequency range corresponding to the collected one-third octave spectrum is calculated as follows: wherein, represents the average noise total value of all sub-inlet areas in the frequency range corresponding to the collected one-third octave spectrum, K is the total number of all sub-inlet areas, represents the average noise value of the kth sub-inlet area in the frequency range corresponding to the collected one-third octave spectrum; wherein: Wherein, J is the total number of noise values collected corresponding to the kth sub-inlet air area when the motor is running at the current target operating gear n, snr j is the jth noise value collected.

7. A readable storage medium having stored thereon a computer program, characterized in that The computer program is executed by a processor to implement the fan system noise control method of any one of claims 1-6.

8. An electric appliance device characterized by The computer program is executed by a processor to implement the fan system noise control method of any one of claims 1-6.

9. The electrical appliance of claim 8, wherein, The electrical appliance is an integrated cooker.

Images