CN113007869B - Method for testing abnormal sound of air conditioner indoor unit caused by thermal expansion and cold contraction - Google Patents
Method for testing abnormal sound of air conditioner indoor unit caused by thermal expansion and cold contraction Download PDFInfo
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- CN113007869B CN113007869B CN202110304460.3A CN202110304460A CN113007869B CN 113007869 B CN113007869 B CN 113007869B CN 202110304460 A CN202110304460 A CN 202110304460A CN 113007869 B CN113007869 B CN 113007869B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention belongs to the technical field of air conditioner testing, and particularly discloses a method capable of accurately testing the abnormal sound condition of an air conditioner indoor unit caused by thermal expansion and cold contraction. The testing method includes the steps that an indoor unit of the air conditioner to be tested is installed in a testing chamber and is connected with an external outdoor unit of the air conditioner, a sound pick-up is placed at a proper position, the air conditioner is started to enable the running state of the air conditioner to be consistent, the air conditioner is placed in a standing mode through simulation of the actual using environment of the indoor unit of the air conditioner, then the environment temperature is increased, low-wind heating running of the indoor unit of the air conditioner is controlled to conduct thermal expansion noise testing, the indoor unit of the air conditioner is closed, the environment temperature is reduced, cold contraction noise testing is conducted, after the testing is completed, a thermal expansion noise curve and a cold contraction noise curve are drawn according to noise data collected by the sound pick-up, finally, noise sharp points of the two noise curves, which are 2-4 dB (A) higher than respective background noise curves of the two noise curves, can be effectively detected, and the testing result is high in accuracy.
Description
Technical Field
The invention belongs to the technical field of air conditioner testing, and particularly relates to a method for testing the abnormal sound of an air conditioner indoor unit caused by thermal expansion and cold contraction.
Background
In the process of starting up or stopping an indoor unit of an air conditioner for a long time, due to dimensional change of air conditioner parts caused by expansion and contraction of structural parts, the positions of connecting points or contact surfaces generate friction vibration to cause abnormal sound. The abnormal sounds have the characteristics of weak regularity, strong randomness of sound magnitude and occurrence time, and reduction and weakening of sound after the air conditioner operates stably. The phenomenon belongs to a long-term common problem in the industry, so that similar descriptions of 'sound produced by plastic parts of an indoor unit when the indoor unit is in cooling or heating operation' can be caused by temperature change on the use specifications of various brands of air conditioners, and after-sales personnel explain the natural phenomenon of expansion with heat and contraction with cold when the user does not evaluate well and complains, the user can generally accept the phenomenon. However, as the structure of the product is complicated and the quality requirement of the product is increased, abnormal sounds generated by expansion with heat and contraction with cold of the structural members of the individual air-conditioning product cause the user to experience worse, and particularly the complaint rate of using a newly-installed air conditioner in winter is higher. In order to improve the quality of the product, improve the size and frequency of abnormal sounds generated by the product due to expansion with heat and contraction with cold, improve the user experience of the product and enhance the market competitiveness of the product, the abnormal sounds generated by expansion with heat and contraction with cold need to be effectively tested so as to be optimized in a targeted manner. At present, no objective test method is used for judging the abnormal sound condition of the indoor unit of the air conditioner caused by thermal expansion and cold contraction, the abnormal sound caused by thermal expansion and cold contraction is generally heard by human ears, and the method has high subjectivity and is not accurate enough and is not beneficial to improvement and optimization of the air conditioner.
Disclosure of Invention
The invention aims to provide a method for accurately testing the abnormal sound condition of the air conditioner indoor unit caused by thermal expansion and cold contraction.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for testing the abnormal sound of the indoor unit of the air conditioner after expansion with heat and contraction with cold comprises the following steps:
selecting a semi-anechoic chamber with background noise not higher than 20dB (A) as a test chamber, wherein the semi-anechoic chamber comprises an indoor noise chamber, and indoor working condition equipment for adjusting the internal environmental conditions of the indoor noise chamber is arranged in the indoor noise chamber;
step two, installing the tested air conditioner indoor unit in an indoor noise room, and connecting the tested air conditioner indoor unit with a matched air conditioner outdoor unit;
thirdly, arranging a sound pick-up in the indoor noise room, placing the sound pick-up in the position 0.5-8 m right ahead of an air outlet of the indoor unit of the air conditioner, and keeping the height of the sound pick-up and the ground of the indoor noise room at 0.5-1 m;
step four, starting the indoor unit of the air conditioner, and enabling the indoor unit of the air conditioner to alternately and circularly operate for 1-8 hours, wherein the indoor unit of the air conditioner operates at the lowest refrigerating temperature when refrigerating, and the indoor unit of the air conditioner operates at the highest heating temperature when heating;
step five, after the circulation operation of the indoor unit of the air conditioner is finished, starting indoor working condition equipment to enable the ambient temperature inside the indoor noise room to be 10 +/-2 ℃, and then enabling the indoor unit of the air conditioner to stand for 1 +/-0.2 h;
step six, testing thermal expansion noise: after the standing of the indoor unit of the air conditioner is finished, the indoor working condition equipment is used for increasing the ambient temperature inside the indoor noise room; then starting a heating mode of an indoor unit of the air conditioner, adjusting the mode to be low-wind-gear air outlet, heating at the highest heating temperature, simultaneously starting a pickup to start recording thermal expansion noise, and stopping the recording of the thermal expansion noise after testing for 30 +/-5 min;
step seven, testing the cold contraction noise: after the thermal expansion noise test is finished, an indoor unit of the air conditioner is closed, meanwhile, the ambient temperature inside an indoor noise chamber is reduced through indoor working condition equipment, a pickup is started to record cold contraction noise, and the recording of the cold contraction noise is stopped after the test is carried out for 15 +/-3 min;
step eight, deriving and drawing a thermal expansion noise curve of the noise value of the air-conditioning indoor unit with respect to time in the heating and starting process and a cold contraction noise curve of the noise value of the air-conditioning indoor unit with respect to time in the heating and stopping process according to the noise data collected by the sound pick-up;
and step nine, counting noise sharp points which are 2-4 dB (A) higher than respective background noise curves in the thermal expansion noise curve and the cold contraction noise curve.
Furthermore, in the first step, the semi-anechoic chamber further comprises an outdoor noise chamber, and outdoor working condition equipment for adjusting the internal environmental conditions of the outdoor noise chamber is arranged in the outdoor noise chamber; and step two, the air conditioner outdoor unit is arranged inside the outdoor noise room.
Further, in the fourth step, one operation cycle of the indoor unit of the air conditioner is as follows: refrigerating for 30 + -10 min, and heating for 30 + -10 min.
Further, in the fifth step, when the indoor working condition equipment is started, the outdoor working condition equipment is also started to enable the ambient temperature inside the outdoor noise room to be 6 +/-2 ℃.
Further, in step five, the ambient temperature is measured using a dry bulb thermometer.
Further, the testing method also comprises the step of evaluating the thermal expansion and cold contraction abnormal sound degree of the indoor unit of the air conditioner according to the statistical noise cusp so as to guide the optimization and improvement process of the air conditioner.
The invention has the beneficial effects that: the testing method comprises the steps of installing the tested air-conditioning indoor unit in a testing chamber, connecting the tested air-conditioning indoor unit with an external air-conditioning outdoor unit, arranging a sound pick-up at a proper position, starting the air conditioner to enable the running state of the air-conditioning indoor unit to be consistent, standing the air-conditioning indoor unit by simulating the actual using environment of the air-conditioning indoor unit, then increasing the ambient temperature, controlling the low-wind heating running of the air-conditioning indoor unit to perform thermal expansion noise test, closing the air-conditioning indoor unit, simultaneously reducing the ambient temperature to perform cold contraction noise test, drawing a thermal expansion noise curve and a cold contraction noise curve according to noise data collected by the sound pick-up after the test is finished, finally counting two noise sharp points of which the noise curves are 2-4 dB (A) higher than respective background noise curves of the two types, effectively detecting the thermal expansion and cold contraction abnormal sound condition of the air-conditioning indoor unit, enabling the test result to be hardly influenced by testers, being higher in accuracy and having objective reference, the method is beneficial to providing guidance for improving and optimizing the air conditioner.
Drawings
FIG. 1 is a schematic diagram of the arrangement of the equipment during the test of the indoor unit of the air conditioner;
FIG. 2 is a thermal expansion noise plot of an embodiment;
FIG. 3 is a cold-shrink noise curve of an embodiment;
labeled as: sound collector 1, air conditioning indoor unit 2, air conditioning outdoor unit 3.
Detailed Description
The invention is further described below with reference to the figures and examples.
The method for testing the abnormal sound of the indoor unit of the air conditioner after expansion with heat and contraction with cold comprises the following steps:
selecting a semi-anechoic chamber with background noise not higher than 20dB (A) as a test chamber, wherein the semi-anechoic chamber comprises an indoor noise chamber, and indoor working condition equipment for adjusting the internal environmental conditions of the indoor noise chamber is arranged in the indoor noise chamber; db (a) in (a) denotes a weighting value a, which is a standard weight curve for audio measurement to reflect response characteristics of human ears; the environmental conditions generally comprise temperature, humidity and the like, the indoor working condition equipment generally comprises a refrigerating machine and a heating machine, the refrigerating machine generally adopts a 7.5P refrigerating machine, and the heating machine adopts a 24KW electric heating device;
step two, installing the tested air conditioner indoor unit 2 in an indoor noise room, and connecting the tested air conditioner indoor unit with a matched air conditioner outdoor unit 3, as shown in fig. 1;
thirdly, arranging a sound pick-up 1 in the indoor noise room, placing the sound pick-up 1 in the position 0.5-8 m right ahead of an air outlet of an indoor unit 2 of the air conditioner, and keeping the height of the sound pick-up 1 and the ground of the indoor noise room at 0.5-1 m; the sound pick-up 1 is a device used for collecting abnormal sound of the indoor unit of the air conditioner after expansion with heat and contraction with cold and then transmitting the abnormal sound to rear-end equipment, and consists of a microphone and an audio amplification circuit; the sound pickup 1 is generally divided into a digital sound pickup and an analog sound pickup, and the digital sound pickup is a sound sensing device which converts an analog audio signal into a digital signal through a digital signal processing system and performs corresponding digital signal processing; the analog sound pick-up just amplifies the sound collected by the microphone by using a common analog circuit;
step four, starting the indoor air-conditioning unit 2, and enabling the indoor air-conditioning unit to alternately and circularly operate for 1-8 hours, wherein the indoor air-conditioning unit 2 operates at the lowest refrigerating temperature when refrigerating, and the indoor air-conditioning unit 2 operates at the highest heating temperature when heating; the step is mainly used for enabling the indoor unit 2 of the air conditioner to achieve the consistency of the running state by enabling the indoor unit 2 of the air conditioner to run in a cooling and heating alternate circulation mode so as to accurately test the indoor unit;
step five, after the circulation operation of the indoor unit 2 of the air conditioner is finished, starting indoor working condition equipment to enable the ambient temperature inside an indoor noise room to be 10 +/-2 ℃, and then enabling the indoor unit 2 of the air conditioner to stand for 1 +/-0.2 h; in the step, a dry bulb thermometer is generally adopted to measure the ambient temperature; standing the indoor air conditioner indoor unit 2 at the indoor noise indoor environment temperature of 10 +/-2 ℃, wherein the indoor noise indoor environment temperature is mainly used for simulating the real use environment of the indoor air conditioner indoor unit 2 so as to improve the authenticity of the test result;
step six, testing thermal expansion noise: after the standing of the indoor unit 2 of the air conditioner is finished, the indoor working condition equipment is used for increasing the ambient temperature inside the indoor noise room; then, starting a heating mode of the indoor unit 2 of the air conditioner, adjusting the mode to be low-wind-gear air outlet, heating at the highest heating temperature, simultaneously starting the pickup 1 to record thermal expansion noise, and stopping the recording of the thermal expansion noise after testing for 30 +/-5 min; in this step, the ambient temperature inside the indoor noise room is generally raised to the test set temperature of the indoor unit 2 of the air conditioner, for example: 30 ℃, 32 ℃ and the like; the indoor working condition equipment is used for increasing the ambient temperature inside the indoor noise chamber, so that the heating speed of the indoor unit 2 of the air conditioner can be increased, the process of expansion with heat and contraction with cold is accelerated, and the testing efficiency is improved; the test time is generally selected to be an integer number of minutes, for example: 25min, 30min, 35min and the like; according to the step, a plurality of weighted values A can be obtained by testing for 30 +/-5 min, so that a curve of the weighted value A of the thermal expansion noise sound pressure level with respect to time can be obtained, and the testing accuracy is further improved;
step seven, testing the cold contraction noise: after the thermal expansion noise test is finished, closing the indoor unit 2 of the air conditioner, simultaneously reducing the ambient temperature inside an indoor noise chamber through indoor working condition equipment, starting the pickup 1 to record cold contraction noise, and stopping the recording of the cold contraction noise after the test is carried out for 15 +/-3 min; in this step, the ambient temperature inside the indoor noise room is generally lowered to the test set temperature of the indoor unit 2 of the air conditioner, for example: 20 ℃, 18 ℃, 16 ℃ and the like; the environmental temperature in the indoor noise room is reduced through the indoor working condition equipment, the cooling speed of the indoor unit 2 of the air conditioner can be increased, the process of expansion with heat and contraction with cold is accelerated, and the testing efficiency is improved; because the process of blowing the waste heat exists after the air-conditioning indoor unit 2 is shut down, the cooling speed is higher, and the auxiliary cooling of indoor working condition equipment is started, so the test time is shorter than the thermal expansion noise test time, namely 12-18 min;
step eight, deriving and drawing a thermal expansion noise curve of the noise value of the indoor unit 2 of the air conditioner with respect to time in the heating startup process and a cold contraction noise curve of the noise value of the indoor unit 2 of the air conditioner with respect to time in the heating shutdown process according to the noise data acquired by the sound pickup 1;
and step nine, counting noise sharp points which are 2-4 dB (A) higher than respective background noise curves in the thermal expansion noise curve and the cold contraction noise curve. Noise peaks 2db (a) and below above the background noise may be caused by the fluctuation of the operation of the indoor unit 2 of the air conditioner under test, and are normal fluctuation, so that abnormal noise statistics are not included.
Specifically, as shown in fig. 1, in the first step, the semi-anechoic chamber further includes an outdoor noise chamber, and outdoor operating condition equipment for adjusting internal environmental conditions of the outdoor noise chamber is arranged in the outdoor noise chamber; the outdoor noise chamber and the indoor noise chamber are generally separated by a partition wall to isolate the sound of the outdoor unit 3 of the air conditioner; outdoor operating equipment generally includes refrigerators and heaters; in the second step, the outdoor unit 3 is generally installed inside the outdoor noise room to prevent the noise generated by the operation of the outdoor unit 3 from interfering with the test.
On the basis, in order to further provide a test effect, in the fifth step, the indoor working condition equipment is started, and meanwhile, the outdoor working condition equipment is also started, so that the ambient temperature inside the outdoor noise chamber is 6 +/-2 ℃. When the thermal expansion noise test and the cold contraction noise test are performed, the environmental conditions of the outdoor unit 3 of the air conditioner are generally kept unchanged.
In order to improve the consistency of the air conditioner operation state, in the fourth step, one operation cycle of the indoor unit 2 of the air conditioner is preferably controlled as follows: refrigerating for 30 + -10 min, and heating for 30 + -10 min.
As a preferred scheme of the invention, the method for testing the abnormal sound caused by thermal expansion and cold contraction of the indoor unit of the air conditioner further comprises the step of evaluating the abnormal sound caused by thermal expansion and cold contraction of the indoor unit 2 of the air conditioner according to the counted noise peak point so as to guide the optimization and improvement process of the air conditioner.
Generally, the process of evaluating the thermal expansion and cold contraction abnormal sound degree of the indoor unit 2 of the air conditioner is to classify noise peaks according to the noise level higher than the background noise level, and then perform weighted scoring to obtain an evaluation value representing the thermal expansion and cold contraction abnormal sound condition of the indoor unit 2 of the air conditioner. Finally, engineers can perform optimization and improvement of different degrees on the indoor unit 2 of the air conditioner according to the obtained evaluation value.
For example, the degree of the abnormal sound caused by thermal expansion and cold contraction of the air conditioning indoor unit 2 may be evaluated as follows:
s1, marking the noise peak which is 4dB (A) higher than the background noise but not more than 7dB (A) of the background noise as a small noise point, marking the noise peak which is 7dB (A) higher than the background noise but not more than 10dB (A) of the background noise as a medium noise point, and marking the noise peak which is 10dB (A) higher than the background noise as a large noise point;
and S2, recording 0.5 minute of each small noise point, 1.2 minutes of each medium noise point and 2 minutes of each large noise point, and carrying out weighted scoring on the counted noise sharp points to obtain an evaluation numerical value representing the thermal expansion and cold contraction abnormal sound condition of the indoor unit 2 of the air conditioner. According to the evaluation mode, for the wall-mounted air conditioner indoor unit, the optimization can be carried out according to the suggestion of more than 60 points, and whether the optimization is actually carried out according to the product positioning or not is judged; as for the cabinet type air conditioner indoor unit, because the room and other wide spaces are usually prevented, the acceptance of the abnormal sound caused by expansion and contraction can be enlarged to 100 minutes, namely more than 100 minutes, and the optimization can be suggested.
The air-conditioning indoor unit 2 is optimized and improved by the following modes: 1) flocking is pasted and the like to buffer and absorb sound; 2) the face-to-face contact is changed into line-to-face contact through a reinforcement mode; 3) and (5) carrying out dermatoglyph treatment.
Examples
The method for testing the abnormal sound caused by expansion with heat and contraction with cold of the indoor unit 2 of the air conditioner comprises the following steps:
selecting a semi-anechoic chamber with background noise not higher than 20dB (A) as a test chamber, wherein the semi-anechoic chamber comprises an indoor noise chamber and an outdoor noise chamber, indoor working condition equipment for adjusting the internal environmental conditions of the indoor noise chamber is arranged in the indoor noise chamber, and outdoor working condition equipment for adjusting the internal environmental conditions of the outdoor noise chamber is arranged in the outdoor noise chamber; the indoor working condition equipment comprises an indoor 7.5P refrigerator and an indoor 24KW electric heating device;
step two, installing the tested indoor air conditioner 2 inside an indoor noise room, installing an outdoor air conditioner 3 matched with the indoor air conditioner 2 inside an outdoor noise room, and connecting the indoor air conditioner 2 and the outdoor air conditioner 3 together, as shown in fig. 1;
thirdly, arranging a sound pick-up 1 in the indoor noise room, placing the sound pick-up 1 in front of an air outlet of an indoor unit 2 of the air conditioner, and keeping the height of the sound pick-up 1 and the ground of the indoor noise room at 0.8 m;
step four, starting the indoor unit 2 of the air conditioner, and enabling the indoor unit 2 of the air conditioner to alternately circulate and operate for 2 hours in a refrigerating and heating mode, wherein the indoor unit 2 of the air conditioner operates at the lowest refrigerating temperature when refrigerating, and the indoor unit 2 of the air conditioner operates at the highest heating temperature when heating; the operation cycle of the indoor unit 2 of the air conditioner is preferably controlled as follows: cooling for 30min, and heating for 30 min;
step five, after the circulation operation of the indoor air-conditioning unit 2 is finished, starting indoor working condition equipment to enable the ambient temperature inside the indoor noise chamber to be 10 ℃, starting outdoor working condition equipment to enable the ambient temperature inside the outdoor noise chamber to be 6 ℃, and then enabling the indoor air-conditioning unit 2 to stand for 1 hour; the method comprises the following steps of measuring the ambient temperature by using a dry bulb thermometer;
step six, testing thermal expansion noise: after the air-conditioning indoor unit 2 is placed still, an indoor 24KW electric heating device is started to assist in heating so as to improve the ambient temperature inside an indoor noise room; then, starting a heating mode of the indoor unit 2 of the air conditioner, adjusting the mode to be low-wind-gear air outlet, heating at the highest heating temperature, simultaneously starting the pickup 1 to record thermal expansion noise, and stopping recording the thermal expansion noise after testing for 30 min;
step seven, testing the cold contraction noise: after the thermal expansion noise test is finished, closing the indoor unit 2 of the air conditioner, simultaneously opening an indoor 7.5P cold machine to reduce the ambient temperature inside an indoor noise chamber, opening the sound pick-up 1 to start recording cold contraction noise, and stopping recording the cold contraction noise after the test is carried out for 15 min;
step eight, deriving and drawing a thermal expansion noise curve of the noise value of the indoor unit 2 of the air conditioner with respect to time in the heating startup process according to the noise data collected by the sound pickup 1, as shown in fig. 2, and a cold contraction noise curve of the noise value of the indoor unit 2 of the air conditioner with respect to time in the heating shutdown process, as shown in fig. 3; in fig. 2 and 3, the unit of measurement of the abscissa is s (seconds), and the unit of measurement of the ordinate is db (a);
step nine, counting noise sharp points which are higher than the respective background noise curves by 3dB (A) in the thermal expansion noise curve and the cold contraction noise curve to obtain 61 noise sharp points;
step ten, evaluating the thermal expansion and cold contraction abnormal sound degree of the air conditioner indoor unit 2 according to the counted noise peak to guide the optimization and improvement process of the air conditioner;
the method comprises the following steps of evaluating the thermal expansion and cold contraction abnormal sound degree of the air-conditioning indoor unit 2 in the following mode:
s1, marking the noise peak which is 4dB (A) higher than the background noise but not more than 7dB (A) of the background noise as a small noise point, marking the noise peak which is 7dB (A) higher than the background noise but not more than 10dB (A) of the background noise as a medium noise point, and marking the noise peak which is 10dB (A) higher than the background noise as a large noise point; 28 small noise points, 11 medium noise points and 22 large noise points are obtained;
s2, taking 0.5 minute for each small noise point, 1.2 minutes for each medium noise point and 2 minutes for each large noise point, and carrying out weighted scoring on the counted noise sharp points: 28 × 0.5+11 × 1.2+22 × 2=71.2 points.
After flocking or liner addition optimization is carried out on the joint of the part with large temperature change of the indoor unit 2 of the air conditioner, the evaluation value which represents the abnormal sound condition of the indoor unit 2 of the air conditioner after thermal expansion and cold contraction is tested again in the same way as the embodiment is 32 minutes, and the optimization way is effective.
Claims (6)
1. The method for testing the abnormal sound of the indoor unit of the air conditioner after expansion with heat and contraction with cold is characterized by comprising the following steps:
selecting a semi-anechoic chamber with background noise not higher than 20dB (A) as a test chamber, wherein the semi-anechoic chamber comprises an indoor noise chamber, and indoor working condition equipment for adjusting the internal environmental conditions of the indoor noise chamber is arranged in the indoor noise chamber;
step two, the tested air conditioner indoor unit (2) is arranged in an indoor noise room and is connected with a matched air conditioner outdoor unit (3);
thirdly, arranging a sound pick-up (1) in the indoor noise room, placing the sound pick-up (1) at a position 0.5-8 m right in front of an air outlet of the indoor unit (2) of the air conditioner, and keeping the height of the sound pick-up (1) and the ground of the indoor noise room at 0.5-1 m;
step four, starting the air-conditioning indoor unit (2), and enabling the air-conditioning indoor unit to alternately and circularly operate for 1-8 hours, wherein the air-conditioning indoor unit (2) operates at the lowest refrigeration temperature when refrigerating, and the air-conditioning indoor unit (2) operates at the highest heating temperature when heating;
step five, after the circulation operation of the indoor air-conditioning unit (2) is finished, starting indoor working condition equipment to enable the ambient temperature inside the indoor noise room to be 10 +/-2 ℃, and then enabling the indoor air-conditioning unit (2) to stand for 1 +/-0.2 h;
step six, testing thermal expansion noise: after the air-conditioning indoor unit (2) is placed statically, the indoor working condition equipment is used for increasing the ambient temperature inside the indoor noise room; then, starting a heating mode of an indoor unit (2) of the air conditioner, adjusting the mode to be low-wind-gear air outlet, heating at the highest heating temperature, simultaneously starting a pickup (1) to start recording thermal expansion noise, and stopping recording the thermal expansion noise after testing for 30 +/-5 min;
step seven, testing the cold contraction noise: after the thermal expansion noise test is finished, closing an indoor unit (2) of the air conditioner, simultaneously reducing the ambient temperature inside an indoor noise chamber through indoor working condition equipment, starting a pickup (1) to start recording cold contraction noise, and stopping recording the cold contraction noise after the test is carried out for 15 +/-3 min;
step eight, deriving and drawing a thermal expansion noise curve of the noise value of the indoor unit (2) of the air conditioner with respect to time in the heating startup process and a cold contraction noise curve of the noise value of the indoor unit (2) of the air conditioner with respect to time in the heating shutdown process according to the noise data acquired by the sound pickup (1);
and step nine, counting noise sharp points which are 2-4 dB (A) higher than respective background noise curves in the thermal expansion noise curve and the cold contraction noise curve.
2. The air conditioner indoor unit thermal expansion and cold contraction abnormal sound testing method as claimed in claim 1, wherein: in the first step, the semi-anechoic chamber also comprises an outdoor noise chamber, and outdoor working condition equipment for adjusting the internal environmental conditions of the outdoor noise chamber is arranged in the outdoor noise chamber; and step two, the air conditioner outdoor unit (3) is arranged in the outdoor noise room.
3. The air conditioner indoor unit thermal expansion and cold contraction abnormal sound testing method as claimed in claim 1, wherein: in the fourth step, one operation cycle of the indoor unit (2) of the air conditioner is as follows: refrigerating for 30 + -10 min, and heating for 30 + -10 min.
4. The air conditioner indoor unit thermal expansion and cold contraction abnormal sound testing method as claimed in claim 2, wherein: and step five, starting the indoor working condition equipment and starting the outdoor working condition equipment to enable the ambient temperature inside the outdoor noise room to be 6 +/-2 ℃.
5. The air conditioning indoor unit thermal expansion and cold contraction abnormal sound testing method as set forth in claim 4, characterized in that: and step five, measuring the ambient temperature by using a dry bulb thermometer.
6. The method for testing the abnormal noise caused by expansion with heat and contraction with cold of the indoor unit of the air conditioner as claimed in any one of claims 1 to 5, wherein: the method also comprises the step of evaluating the thermal expansion and cold contraction abnormal sound degree of the indoor unit (2) of the air conditioner according to the statistical noise cusp so as to guide the optimization and improvement process of the air conditioner.
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