KR0111191Y1 - Noise control apparatus of an airconditioner the attaching structure of seat braket - Google Patents

Abstract

The present invention relates to a noise control device for an air conditioner for actively attenuating noise generated during operation of an air conditioner, comprising: a noise sensing means (10) for detecting noise generated during operation of an air conditioner; And a control means 20 for receiving a noise signal sensed by the noise sensing means 10 and outputting a noise control signal having the same amplitude and opposite phase to the noise signal so as to control the noise, and the control means 20. Control sound generating means 30 for generating a control sound to attenuate the noise by receiving the noise control signal output from the) and the noise detected by the noise detecting means 10 in the control sound generating means (30) It is characterized in that it consists of error sound detection means 40 for detecting the error sound attenuated by the generated control sound and outputting the detected error sound signal to the control means 20, the adaptation to changes in the control environment Ability By actively attenuating random noise in the low frequency band, the performance of the device can be improved and a pleasant indoor environment can be provided.

Description

Noise control device of air conditioner

1 is a schematic control block diagram of a conventional air conditioner.

Figure 2 is a schematic side cross-sectional view showing the indoor unit of the air conditioner according to an embodiment of the present invention.

Figure 3 is a schematic side cross-sectional view showing an indoor unit of the air conditioner according to another embodiment of the present invention.

Figure 4 is a schematic block diagram of the noise control device of the air conditioner according to an embodiment of the present invention.

Figure 5 is a detailed control block diagram of the noise control device of the air conditioner according to an embodiment of the present invention.

6 is a block diagram for generating an acoustic feedback compensation unit and an acoustic propagation filter unit applied to the present invention.

7 is a noise spectrum showing a noise control state according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10: noise detection means 11: noise detection

20: control means 21: acoustic feedback compensation unit

23: main control unit 25: acoustic propagation filter unit

27: error compensator 28: random signal generator

29: minimum error compensation unit 30: control sound generating means

33: control sound generator 40: error sound detection means

41: error sound detector

The present invention relates to a noise control device of an air conditioner for actively attenuating noise generated during operation of the air conditioner.

In general, in the conventional noise control device for an air conditioner, there is Korean Patent Publication No. 93-7959 filed on December 19, 1990 by Geumseong.

As shown in FIG. 1, the air conditioner disclosed in the publication has a noise detector 60 for detecting vibration noise which varies with temperature and rotational speed of a fan motor, and the noise detector 60 is detected by the noise detector 60. The transfer function is obtained by database noise spectrum according to the selected strong, medium, and weak air volume selected by the selected vibration noise and air volume selection button, and the reverse phase is the same as the vibration noise and the indoor unit. The controller 62 synthesizes the parameterized database of the signal and amplifies the signal into an antiphase signal, and the antiphase signal output from the controller 62 interferes with the original noise exhausted by the exhaust grid of the air conditioner. Control noise source generating means 64 for reducing noise by generating a noise, and detecting the reduced noise according to the control sound generated by the control noise source generating means 64 and outputting it to the controller 62. Consists of the monitoring microphone 66, which.

In the noise control operation of the air conditioner configured as described above, first, the motor starts driving according to the selection of the strong, medium, and weak air volume, and the centrifugal fan rotates according to the driving of the motor to suck in the hot air of the room Suction in the forcibly moved to the exhaust grid side.

The passage of the indoor air passes through the heat exchanger in the suction grid, and takes heat from the air while the heat exchanged cold air is discharged into the room through the exhaust grid to start cooling the room.

At this time, the noise detection unit 60 detects the vibration noise according to the rotation of the motor during the operation of the air conditioner, the controller 62 in advance the various noise spectrum, the transfer function and parameters based on the detected vibration signal The transfer function is obtained by adjusting the gain from the difference between the vibration signal sensed by the noise detection unit 60 and the database-based noise spectrum.

On the other hand, the temperature distribution data of the room is obtained from the database based on the signal detected by another temperature sensor of the noise detection unit 60, and then the control noise source according to the synthesized anti-phase signal based on the obtained parameters. By generating the control noise source in the generating means 64, the original noise is reduced.

The controller 62 reads the noise reduction state at this time through the monitoring microphone 66, memorizes the noise level and the parameters of the previous stage, and compares the results to continuously adjust the parameters to exhaust the exhaust air. The original noise emitted to the grid can be attenuated.

However, in the conventional noise control method, since the vibration noise detected by the noise detector is judged by using a database, it is difficult to control random noise that does not exist in the database. Even if the noise detected by the noise detector is similar to the noise spectrum in the database, it is difficult to completely match, so the stability of the control system is destroyed, which causes abnormal sound or effectively absorbs and attenuates the noise. there was.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to improve the adaptive capacity of the control environment by using the adaptive control algorithm of the control means to actively suppress random noise in the low frequency band. The present invention provides a noise control device for an air conditioner that can improve the performance of the device and can provide a comfortable indoor environment.

In order to achieve the above object, the noise control apparatus of an air conditioner according to the present invention includes a noise sensing means for sensing noise generated when the air conditioner is operated in the air conditioner and the noise sensing means. A control means for outputting a noise control signal having the same amplitude and opposite phase as the noise signal to control the noise by receiving the noise signal, and generating a control sound to attenuate the noise by receiving the noise control signal output from the control means; A control sound generating means for detecting the error sound attenuated by the control sound generated by the control sound generating means, and outputting the detected error sound signal to the control means. Characterized in that the sound detection means.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described in detail.

As shown in FIGS. 2 to 3, the front surface of the main body 1 forms the appearance of an air conditioner, and a cover member 8 having a driving operation unit is fixed to a predetermined position, and the main body 1 is fixed. The inlet port 2 is formed in the lower part of the front surface, and the discharge port 3 is formed in the upper part of the front surface of the said main body 1. As shown in FIG.

In addition, an upper part of the main body 1 is equipped with an evaporator 4 for heat-exchanging indoor air sucked through the suction port 2 with cold air, and a lower part of the main body 1 with the suction port 2. Blowing fan (6) is installed in the fan motor (5) to suck the indoor air through the air at the same time to discharge the cold air heat exchanged in the evaporator (4) to the room through the discharge port (3).

The rear of the suction port 2 is equipped with a noise detector 11 made of a microphone to detect the noise generated by the driving of the fan motor 5 and the blowing fan 6, the noise detector 11 The front surface is attached to the wind screen 11a or the tube (11b) to remove the pressure pulsation caused by the turbulence caused by the movement of the fluid.

In addition, the rear of the discharge port 3 is a control sound generator 33 made of a speaker to generate a control sound of the same amplitude and opposite phase to the noise signal detected by the noise detector 11, the noise detector 11 ) Is installed at a certain distance.

On the other hand, the control sound generator 33 is such that the front of the main body 1 to the front so that the sound power emitted through the discharge port 3 is greater than the sound power emitted through the suction port (2) It is mounted inclined toward the discharge port (3).

In addition, according to another embodiment of the present invention, as shown in FIG. 3, the control sound generator 33 is mounted on the front lower end of the discharge port 3 so that the acoustic power emitted through the discharge port 3 is The front surface of the main body 1 is mounted to be inclined in the direction of the discharge port 3 so as to be larger than the acoustic power emitted through the suction port 2.

In addition, in the drawing, at the lower end of the front of the discharge port 3 so that the noise detected by the noise detector 11 is a result of attenuated by the control sound generated by the control sound generator 33 to detect an error sound. An error sound detector 41 made of a microphone is mounted at a predetermined distance from the noise detector 11 to measure noise in a wide frequency band, and is generated due to the movement of a fluid in front of the error sound detector 41. A wind screen 41a or a tube 41b is attached to remove pressure pulsations caused by turbulent flow.

A block diagram for controlling noise generated when the air conditioner is configured as described above will be described in detail with reference to FIGS. 4 to 5.

As shown in FIGS. 4 to 5, the noise detecting means 10 detects noise generated by driving the blower fan 6 and the fan motor 5 when the air conditioner is operated. The noise detecting means 10 includes a noise detector 11 made of a microphone so as to detect vibration noise generated by the driving of the blower fan 6 and the fan motor 5, and the noise detector 11. A first amplifier 12 for amplifying the detected noise signal into an electrical signal for A / D conversion and a first A / D for converting analog data of the noise signal amplified by the first amplifier 12 into digital; The converter 13 is comprised.

The control means 20 receives the noise signal detected by the noise detection means 10 and the error sound signal detected by the error sound detection means described later, and is generated according to the driving of the fan motor and the blowing fan 6. By controlling the noise, the control means 20 includes an acoustic feedback compensator 21 for removing the control sound fed back from the control sound generator 33 to the noise detector 11, and the noise sensing means ( A main control unit 23 which receives the original noise signal from which the control sound fed back to the noise detector 11 is removed from the noise detected by 10) and outputs a noise control signal having the same amplitude and opposite phase as the noise signal; Acoustic propagation filter unit 25 for removing an acoustic signal generated while the noise signal sensed by the noise sensing means 10 is propagated to the control sound generator 33, and the acoustic propagation filter unit 25 Noise signal and image which removed acoustic signal by It consists of a negative error detector 41, error correction unit 27 that outputs the compensation signal to minimize the error obtained and an error is detected the sound signal to the main control section 23 by the.

The control sound generating means 30 generates the control sound according to the noise control signal (signal having the same amplitude and opposite phase as the noise signal) output from the control means 20, thereby generating the control sound. 30 is a D / A converter 31 for converting digital data of the noise control signal output from the noise control means 20 into an analog signal, and the noise control signal converted by the D / A converter 31. A second amplifier 32 for amplifying the analog data into a control sound signal, and a control sound generator configured to generate a control sound by modulating the noise control signal amplified by the second amplifier 32 into a control sound signal. It consists of 33.

In addition, the error sound detecting means 40 receives the noise signal detected by the noise detecting means 10 and at the same time receives the control sound signal generated from the control sound generating means 30 and compared them as a result As a result, the noise detected by the noise detecting means 10 detects an error sound attenuated by the control sound generated from the control sound generating means 30, and transmits the detected error sound signal to the control means 20. By outputting, the error sound detecting means 40 detects the error sound attenuated by the control sound signal generated by the control sound generating means 30 from the noise signal detected by the noise detecting means 10. An error sound detector 41 made of a microphone, a third amplifier 42 for amplifying the error sound signal detected by the error sound detector 41 into an electrical signal for A / D conversion, and the third Increase by amplifier 42 The may converts the analog data into digital sound signal of the OPA is composed of the 2A / D converter 43 for output to the control means 20.

Next, a process of updating the coefficient values of the acoustic feedback compensator 21 and the acoustic wave filter 25 of the control means 20 will be described with reference to FIG.

As shown in FIG. 6, the random signal generator 28 checks a specific bit of a specific register inside a digital signal processor (not shown) and selects the highest signal level according to the state of the specific bit. Pseudo-Random Binary Signal generator which randomly generates the minimum signal level for each sampling. This signal has the characteristics of white noise signal.

The operation continues for a predetermined time under the control of the main controller 23.

The random signal generated by the random signal generator 28 is transmitted to the inside of the air conditioner as a random control sound through the control sound generator 33, and the remaining random control sound is detected by the noise detector 11. To be detected).

The minimum error compensator 29 calculates a filter coefficient so as to minimize an error amount in consideration of the control sound signal detected by the noise detector 11 and converts the calculated filter coefficient into an acoustic feedback compensator 21. The sound feedback compensation unit 21 is generated while updating to).

In addition, the error sound detector 41 detects a random control sound transmitted to the inside of the air conditioner through the control sound generator 33.

The minimum error compensator 29 calculates a filter coefficient so as to minimize an error amount in consideration of the control sound signal detected by the error sound detector 41 and converts the calculated filter coefficient into an acoustic propagation filter unit ( The sound propagation filter unit 25 is generated while updating to 25.

Hereinafter, the effect of the noise control device of the air conditioner configured as described above will be described.

First, when the user turns on the operation switch (not shown), the blowing fan 6 is driven in accordance with the driving of the fan motor 5 to suck in the hot air of the room through the suction port 2.

The hot air of the room sucked through the suction port 2 is cooled while passing through the evaporator 4 and heat-exchanged with cold air. The heat-exchanged cold air is discharged into the room through the discharge port 3 so that the user Maintain the desired temperature.

When the air conditioner is operated as described above, the control means 20 receives the DC voltage supplied from the DC power supply means (not shown) and starts to operate while controlling the overall operation of the air conditioner.

When the control means 20 starts to operate, the random signal generator 28 checks a specific bit of a specific register inside the digital signal processor, and according to the state of the specific bit, the highest signal level and minimum value. Randomly generate a signal level of? To generate a white noise signal.

The random signal generated by the random signal generator 28 is transmitted to the inside of the air conditioner as a random control sound through the control sound generator 33, and the transmitted random control sound is detected by the noise detector 11. ) And the error sound detector 41.

In addition, the minimum error compensator 29 calculates a filter coefficient to minimize an error amount in consideration of the control sound signal detected by the noise detector 11 and the error sound detector 41, and calculates the calculated filter coefficient. The sound feedback compensator 21 and the sound feedback compensator 21 are generated while updating the sound feedback compensator 21 and the acoustic propagation filter unit 25.

On the other hand, during operation of the air conditioner as described above, the noise generated by the vibration of the driving of the fan motor 5 and the blowing fan 6 starts to emit the fluid noise generated during the movement of the fluid. When the noise is radiated as described above, the fan motor (5) and the blowing fan by removing the pressure pulsation caused by the movement of the fluid in the wind screen (11a) or tube (11b) attached to the front of the noise sensor (11). Only noise generated by driving of 6 is detected by the noise sensor 11.

The minute noise signal sensed by the noise detector 11 is amplified into an electrical analog signal through the first amplifier 12, and the amplified analog noise signal is converted into digital data by the first A / D converter 13. It is converted and input to the control means 20.

At this time, the sound feedback compensation unit 21 of the control means 20 removes the control sound signal generated from the control sound generator 33 and fed back to the noise sensor 11.

Therefore, in the main control unit 23 of the control means 20, the first signal is fed back to the noise detector 11 in the noise signal converted into digital by the first A / D converter 13 of the noise detection means 10 Receives the original noise signal from which the speech signal is removed, and outputs to the control sound generating means 30 a noise control signal having the same amplitude and opposite phase as the noise signal.

Accordingly, the control sound generating means 30 converts the digital data of the noise control signal output from the main controller 23 into analog data in the D / A converter 31.

The analog data of the noise control signal converted by the D / A converter 31 is amplified by the second amplifier 32, and the amplified noise control signal is modulated by the control sound generator 33 into a control sound signal. The noise detected by the noise detector 11 generates a control sound having the same amplitude and opposite phase.

Therefore, the noise generated by the driving of the fan motor 5 and the blowing fan 6 is interfered by the control sound generated through the control sound generator 33 and the original noise starts to be attenuated.

At this time, if the noise detected by the noise detector 11 and the control sound generated through the control sound generator 33 are completely matched with each other, the noise can be most effectively removed, but the operation state of the air conditioner is changed. And as the environment changes indoors, the noise and the control sound are not completely matched, and some error occurs.

Accordingly, the noise signal detected by the noise detector 11 is superimposed on the noise detector 11 by overlapping the noise detected by the noise detector 11 and the control sound generated through the control sound generator 33. The error sound detector 41 detects an error sound interfering with the noise signal from which the control sound signal is fed back.

At this time, by removing the pressure pulsation caused by the movement of the fluid in the wind screen (41a) or the tube (41b) attached to the front of the error sound detector 41, the error sound detector 41 in the fan motor (5) And only the error noise attenuated by the control noise generated by the control sound generator 33 and the vibration noise generated by the driving of the blower fan 6 are detected by the error sound detector 11. The error sound signal detected by the error sound detector 41 is amplified into an electrical analog signal through the third amplifier 42, and the error sound signal of the amplified analog is transmitted through the second A / D converter 43. The data is converted into digital data and input to the error compensator 27 of the control means 20.

Accordingly, the error compensator 27 calculates a filter coefficient of the main controller 23 according to the noise signal detected by the noise detector 11 and the error sound signal detected by the error sound detector 41. The main controller 23 outputs a compensation signal for minimizing the sound error signal.

Accordingly, in the main control unit 24, the error sound detected by the error sound detector 41 is minimum (ideally, the noise detected by the noise detector and the control sound generated from the control sound generator coincide). Outputs a noise control signal to the control sound generating means 30 so as to be.

Accordingly, in the control sound generating means 30 according to the noise control signal output from the main control unit 23, the control sound generator having the same amplitude and opposite phase as the noise detected by the noise detector 11. As it occurs through (33), the error sound begins to decrease gradually.

As the error sound gradually decreases as described above, the noise generated by the driving of the blower fan 6 and the fan motor 5 can be more effectively attenuated after the noise control than before the noise control, as shown in FIG. 7. .

According to the noise control device of the air conditioner according to the present invention as described above, by using the adaptive control algorithm of the control means to improve the adaptive ability to change the control environment to actively attenuate random noise in the low frequency band It is possible to improve not only the performance of the device, but also to provide a comfortable indoor environment.

Claims (12)

In the air conditioner, the noise detection means for detecting the noise generated during operation of the air conditioner and the noise signal detected by the noise detection means 10 to receive the noise signal to control the noise A control means 20 for outputting a noise control signal having the same amplitude and opposite phase as that of the control unit; and a control sound generating means for generating a control sound to attenuate the noise by receiving the noise control signal output from the control means 20 ( 30) and the noise detected by the noise detecting means 10 detects an error sound attenuated by the control sound generated by the control sound generating means 30 and outputs the detected error sound signal to the control means ( Noise control device of the air conditioner, characterized in that consisting of the error sound detection means for outputting to (40). According to claim 1, wherein the noise detection means 10 is a noise detector 11 for detecting the noise generated by the driving of the blower fan 6, and the noise signal detected by the noise detector 11 A And a first A / D converter 13 for converting analog data of the noise signal amplified by the first amplifier 12 into digital. Noise control device for air conditioners. The method of claim 1, wherein the control means 20 is an acoustic feedback compensation unit 21 for removing the control sound fed back to the noise detector 11 from the control sound generating means 30, and the noise detection means ( A main control unit 23 which receives the original noise signal from which the control sound fed back to the noise detector 11 is removed from the noise detected by 10) and outputs a noise control signal having the same amplitude and opposite phase as the noise signal; In addition, the acoustic signal filter 25 for removing the sound signal generated while the noise signal sensed by the noise detection means 10 is propagated to the control sound generator 33, and to the acoustic wave filter unit 25 The error signal from which the acoustic signal is removed by the error signal and the error sound signal detected by the error sound detecting means 40, and outputs a compensation signal to the main controller 23 to minimize the error sound. Air tank characterized in that it is configured Fire noise control device. 2. The air as claimed in claim 1, wherein the control means (20) comprises a random signal generator (28) for generating a random signal to minimize the error sound detected by the error sound detection means (40). Noise control device of harmonics. 2. The D / A converter (31) according to claim 1, wherein the control sound generating means (30) converts digital data of the noise control signal output from the control means (20) into an analog signal, and the D / A converter. A second amplifier 32 for amplifying the analog data of the noise control signal converted by (31) and a noise control signal amplified by the second amplifier 32 into a control sound signal to generate a control sound. Noise control device of an air conditioner, characterized in that the control sound generator (33). The method of claim 1, wherein the error sound detecting means 40 detects the error sound attenuated by the control sound generated from the control sound generating means 30 is the noise sensed by the noise detection means (10) An error sound detector 41, a third amplifier 42 for amplifying the error sound signal detected by the error sound detector 41 for A / D conversion, and amplified by the third amplifier 42. And a second A / D converter (43) for converting analog data of an error sound signal into digital. The noise control device of claim 2, wherein the noise detector (11) has a wind screen (11a) attached to its front surface to remove pressure pulsations caused by the movement of the fluid. The noise control device of claim 2, wherein the noise detector (11) has a tube (11b) attached to its front surface to remove pressure pulsations caused by the movement of the fluid. 6. The control sound generator (33) according to claim 5, wherein the control sound generator (33) is inclined toward the discharge port (3) in order to make the acoustic power emitted through the discharge port (3) larger than the acoustic power emitted through the suction port (2). Noise control device of the air conditioner, characterized in that. 7. The noise control device of an air conditioner according to claim 6, wherein the error sound detector (41) has a wind screen (11a) attached to its front surface to remove pressure pulsations caused by the movement of the fluid. 6. The noise control device of an air conditioner according to claim 5, wherein the error sound detector (41) has a tube (41b) attached to its front surface to remove pressure pulsations caused by the movement of the fluid. 6. The noise control apparatus of an air conditioner according to claim 5, wherein the error sound detector (41) is mounted at a predetermined distance away from the center of the lowest end of the discharge port (3) to measure noise in a wide frequency band.