Air conditioners and their noise reduction methods

Abstract

This invention provides a noise reduction method for an air conditioner, wherein the air conditioner includes a compression refrigeration cycle system partially located within the outdoor unit of the air conditioner, and a silencer is installed in the fluid path of the compression refrigeration cycle system within the outdoor unit. The method includes: obtaining the noise reduction amount of the silencer corresponding to different refrigerant airflow velocities; determining multiple medium flow velocity point values ​​corresponding to the noise reduction amplitude; and controlling the refrigerant to flow according to the multiple medium flow velocity point values ​​during the variable frequency operation of the compressor. The noise reduction method of this invention fully considers the influence of refrigerant airflow velocity on the noise reduction performance of the silencer, significantly reducing the operating noise of the air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioner and its noise reduction method. Background Technology

[0002] In recent years, with the continuous development of technology and the improvement of living standards, users have placed higher demands on the comfort of air conditioners. A single-expansion muffler is installed in the fluid path of the compression refrigeration cycle system to reduce the noise generated by the compressor during operation. However, existing air conditioners still generate considerable noise, affecting user comfort and thus requiring further improvement. Summary of the Invention

[0003] To address the aforementioned problems, embodiments of the present invention provide an air conditioner that can effectively reduce noise and a noise reduction method thereof.

[0004] Specifically, the present invention provides a noise reduction method for an air conditioner, wherein the air conditioner includes a compression refrigeration cycle system partially located within the outdoor unit of the air conditioner, and a silencer is provided in the fluid path of the compression refrigeration cycle system within the outdoor unit; the method includes:

[0005] Obtain the noise reduction amount of the silencer corresponding to different airflow velocities of the cold medium;

[0006] Determine multiple medium flow velocity points corresponding to the noise reduction amplitude;

[0007] During the variable frequency operation of the compressor, the refrigerant is controlled to flow according to multiple medium flow rate points.

[0008] Optionally, the compressor is a variable frequency compressor with an operating frequency of 20Hz-60Hz;

[0009] The refrigerant flow rate range of the compression refrigeration cycle system is 3m / s-15m / s.

[0010] Optionally, in the step of controlling the refrigerant to flow according to multiple medium flow rate points during the variable frequency operation of the compressor:

[0011] During the variable frequency operation of the compressor, the higher the operating frequency of the compressor, the higher the corresponding medium flow velocity value.

[0012] Optionally, after determining the multiple medium flow velocity point values ​​corresponding to the noise reduction amplitude, the method further includes:

[0013] Calculate the difference between each medium flow velocity point value and the preset fluctuation value, and the sum of the medium flow velocity point value and the preset fluctuation value to obtain multiple medium flow velocity interval values;

[0014] During the variable frequency operation of the compressor, the refrigerant is controlled to flow according to multiple medium flow rate ranges.

[0015] Optionally, the silencing device is a single expansion silencer connected between the compressor's exhaust end and any heat exchanger in the compression refrigeration cycle system.

[0016] Optionally, the single expansion silencer includes: an expansion tube and connecting tubes connected to both ends of the expansion tube, wherein the ratio of the inner diameter of the expansion tube to the inner diameter of the connecting tube is 2:1 to 4:1; and the length of the expansion tube is 80mm to 120mm.

[0017] Optionally, the air conditioner also includes:

[0018] Airflow velocity sensor, used to detect the airflow velocity of cold medium; and

[0019] The refrigerant flow rate controller is located between the compressor's exhaust end and the silencer device, and is used to regulate the airflow speed of the refrigerant.

[0020] Optionally, the method further includes:

[0021] Acquire noise data from the outdoor unit when the compressor operates at different frequencies;

[0022] Analyze the noise data to obtain the spectrum data;

[0023] Multiple medium flow velocity values ​​were corrected based on spectral data.

[0024] Optionally, noise data is measured using an acoustic microphone;

[0025] The spectrum data is generated by a spectrum analyzer.

[0026] The present invention also provides an air conditioner, comprising:

[0027] The compression refrigeration cycle system is partially located inside the outdoor unit of the air conditioner;

[0028] A silencer is installed in the fluid path of the compression refrigeration cycle system inside the outdoor unit; and

[0029] The control device has a memory and a processor. The memory stores a machine-executable program, which, when executed by the processor, is used to implement the aforementioned noise reduction method for the air conditioner.

[0030] The noise reduction method of the air conditioner of the present invention includes a silencing device installed in the fluid path of the compression refrigeration cycle system inside the outdoor unit. By obtaining the silencing amount of the silencing device corresponding to different refrigerant airflow velocities and determining multiple medium flow velocity point values ​​corresponding to the silencing amount amplitude, and controlling the refrigerant to flow according to multiple medium flow velocity point values ​​during the variable frequency operation of the compressor, the influence of the refrigerant airflow velocity on the silencing performance of the silencing device is fully considered, so that the silencing amount is always at the amplitude and the silencing effect of the silencing device is always optimal, thereby significantly reducing the operating noise of the air conditioner.

[0031] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0033] Figure 1 This is a schematic diagram of the component configuration of the compression refrigeration cycle system and the silencer device of an air conditioner according to an embodiment of the present invention.

[0034] Figure 2 yes Figure 1 The diagram shows the structure of the silencer device in the air conditioner.

[0035] Figure 3 yes Figure 1 The flowchart shows the noise reduction method for the air conditioner.

[0036] Figure 4 yes Figure 1 The diagram shows the component composition of an air conditioner.

[0037] Figure 5 yes Figure 1 The diagram shows the component composition of the control unit of the air conditioner.

[0038] Figure 6 These are the noise reduction characteristic curves under different airflow velocities of different cooling media.

[0039] Figure 7 This is a graph showing the change in noise reduction as a function of the airflow velocity of the cooling medium. Detailed Implementation

[0040] Figure 1 This is a schematic diagram of the component configuration of the compression refrigeration cycle system 200 and the silencer 300 of the air conditioner 10 according to an embodiment of the present invention. Figure 2 yes Figure 1 The diagram shows the structure of the silencer 300 of the air conditioner 10. Figure 3 yes Figure 1 A flowchart of the noise reduction method for the air conditioner 10 shown.

[0041] This invention first provides an air conditioner 10. (Refer to...) Figure 1 The air conditioner 10 can be a split-type air conditioner 10, generally including an indoor unit 110, an outdoor unit 120, and a compression refrigeration cycle system 200, which is partially located within the outdoor unit 120 of the air conditioner 10. The air conditioner 10 of the present invention further includes a silencer 300 disposed in the fluid path of the compression refrigeration cycle system 200 within the outdoor unit 120. The compression refrigeration cycle system 200 may include a compressor 210 connected by a refrigerant pipeline 230, two heat exchangers 220, etc., one of which is a condenser and the other is an evaporator.

[0042] like Figure 3 As shown, the noise reduction method of the air conditioner 10 in this embodiment of the invention includes the following steps:

[0043] S102: Obtain the noise reduction of the silencer 300 corresponding to different airflow velocities of the cold medium;

[0044] S104: Determine multiple medium flow velocity points corresponding to the noise reduction amplitude;

[0045] S106: During the variable frequency operation of compressor 210, the refrigerant is controlled to flow according to multiple medium flow rate points.

[0046] The noise reduction method of the air conditioner 10 in this embodiment of the invention includes a silencing device 300 installed in the fluid path of the compression refrigeration cycle system 200 inside the outdoor unit 120. By obtaining the noise reduction amount of the silencing device 300 corresponding to different refrigerant airflow velocities, and determining multiple medium flow velocity point values ​​corresponding to the noise reduction amplitude, the refrigerant is controlled to flow according to multiple medium flow velocity point values ​​during the variable frequency operation of the compressor 210. The influence of the refrigerant airflow velocity on the noise reduction performance of the silencing device 300 is fully considered. Based on the influence law of the refrigerant airflow velocity on the noise reduction performance of the silencing device 300, the refrigerant flow velocity is controlled so that the noise reduction amount is always at the amplitude, and the noise reduction effect of the silencing device 300 is always optimal, thereby significantly reducing the operating noise of the air conditioner 10.

[0047] The compressor 210 of the air conditioner 10 in this embodiment of the invention is typically an inverter compressor 210 with an operating frequency of 20Hz-60Hz; the flow rate of the refrigerant in the compression refrigeration cycle system 200 is in the range of 3m / s-15m / s.

[0048] The silencer 300 of the air conditioner 10 in this embodiment of the invention is a single-expansion silencer, connected between the exhaust end of the compressor 210 and any heat exchanger 220 of the compression refrigeration cycle system 200. (Refer to...) Figure 1 A single-expansion muffler can be connected between the discharge end of the compressor 210 and the four-way valve 240 of the compression refrigeration cycle system 200. It is constructed including an expansion pipe 310 and connecting pipes 320 connected to both ends of the expansion pipe 310, with the inner diameter of the expansion pipe 310 being larger than the inner diameter of the connecting pipe 320. Typically, the ratio of the inner diameter of the expansion pipe 310 to the inner diameter of the connecting pipe 320 is 2:1 to 4:1; and the length of the expansion pipe 310 is 80mm to 120mm. For example, the ratio of the inner diameter of the expansion pipe 310 to the inner diameter of the connecting pipe 320 can be 2:1, 3:1, or 4:1. The length of the expansion pipe 310 can be, for example, 80mm, 100mm, or 120mm. The connecting pipe 320 is interference-fitted into the refrigerant line 230 in the compression refrigeration cycle system 200. Due to the limitation of the inner diameter of the refrigerant line 230, in some embodiments, the inner diameter of the expansion pipe 310 can be 24 mm, and the inner diameter of the connecting pipe 320 can be 8 mm.

[0049] When the compressor 210 of the air conditioner 10 in this embodiment of the invention operates at the maximum operating frequency of 60Hz, there is peak noise in the vicinity of 235Hz. According to the relevant design manual, the aforementioned single expansion silencer is used as the silencing device 300. Figure 6 The silencing characteristic curves of the aforementioned single-expansion muffler were calculated using finite element simulation analysis under different airflow velocities of the cooling medium. Figure 6 It can be concluded that the optimal silencing frequency decreases with increasing cold medium airflow velocity. The silencing amplitude data for different cold medium airflow velocities are extracted, such as... Figure 7 The graph shown illustrates the variation of noise reduction with the airflow velocity of the cooling medium. From... Figure 7 As can be seen, there are three medium flow velocity points corresponding to the determined noise reduction amplitude: 3 m / s, 9 m / s, and 15 m / s. Based on this, in the noise reduction method of the air conditioner 10 of this embodiment, during the variable frequency operation of the compressor 210, the refrigerant is controlled to flow according to multiple medium flow velocity points, that is, during the variable frequency operation of the compressor 210, the refrigerant is controlled to flow at 3 m / s, 9 m / s, and 15 m / s.

[0050] like Figure 5 As shown, the air conditioner 10 of this embodiment of the invention further includes: a control device 800, having a memory 801 and a processor 802. The memory 801 stores a machine-executable program 810. When the machine-executable program 810 is executed by the processor 802, it is used to implement the aforementioned noise reduction method of the air conditioner 10.

[0051] In the noise reduction method of the air conditioner 10 of this embodiment, in the step of controlling the refrigerant to flow according to multiple medium flow rate points during the variable frequency operation of the compressor 210: during the variable frequency operation of the compressor 210, the higher the operating frequency of the compressor 210, the higher the corresponding medium flow rate point value. For example, when the operating frequency of the compressor 210 is 60Hz, the corresponding medium flow rate point value is 15m / s; when the operating frequency of the compressor 210 is 20Hz, the corresponding medium flow rate point value is 3m / s.

[0052] Figure 4 yes Figure 1 The diagram shows the component configuration of the air conditioner 10. The air conditioner 10 of this embodiment further includes an airflow velocity sensor 400 and a refrigerant flow rate controller 500. The airflow velocity sensor 400 is used to detect the refrigerant flow velocity. The refrigerant flow rate controller 500 is disposed between the exhaust end of the compressor 210 and the silencer 300, and is used to adjust the refrigerant flow velocity. For example, during the change in the operating frequency of the compressor 210 from 60Hz to 20Hz, the refrigerant flow rate controller 500 controls the refrigerant flow velocity to first be 15m / s, then 9m / s, and finally 3m / s. The noise reduction method of the air conditioner 10 of this embodiment can minimize the intermediate value of the refrigerant flow velocity, so that the noise reduction of the silencer 300 is always within its amplitude range. Figure 4 As shown, the airflow velocity sensor 400 is used to monitor the flow velocity at the outlet end of the silencer 300.

[0053] In the noise reduction method of the air conditioner 10 of this embodiment, after the step of determining the multiple medium flow velocity point values ​​corresponding to the noise reduction amplitude, the method further includes:

[0054] Calculate the difference between each medium flow velocity point value and the preset fluctuation value, and the sum of the medium flow velocity point value and the preset fluctuation value to obtain multiple medium flow velocity interval values;

[0055] During the variable frequency operation of compressor 210, the refrigerant is controlled to flow according to multiple medium flow rate ranges.

[0056] By setting a preset fluctuation value, the noise reduction of the silencer 300 can be kept near its amplitude while avoiding frequent adjustments to the refrigerant flow rate. Therefore, in the noise reduction method of the air conditioner 10 of this embodiment, the noise level of the air conditioner 10 can be effectively reduced by controlling the refrigerant flow rate and reducing refrigerant flow rate fluctuations. The preset fluctuation value can be 0.2 m / s to 0.4 m / s, for example, 0.3 m / s. The refrigerant flow rate controller 500 stabilizes the refrigerant flow rate, keeping the refrigerant flow rate fluctuation range within 0.3 m / s.

[0057] The noise reduction method of the air conditioner 10 in this embodiment of the invention further includes:

[0058] Acquire noise data inside the outdoor unit 120 when the compressor 210 operates at different operating frequencies;

[0059] Analyze the noise data to obtain the spectrum data;

[0060] Multiple medium flow velocity values ​​were corrected based on spectral data.

[0061] Noise data was measured by acoustic microphone 600; spectrum data was generated by spectrum analyzer 700. For example... Figure 4 As shown, during the manufacturing process of the air conditioner 10, the noise can be tested by arranging acoustic microphones 600 at the inlet and outlet of the silencing device 300. Then, the noise spectrum curve is analyzed by a spectrum analyzer 700 and compared with the simulation analysis results. The simulation design is continuously optimized and multiple medium flow rate values ​​are corrected, thereby making the refrigerant flow rate control of the air conditioner 10 more precise and the noise reduction effect better.

[0062] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A method of reducing noise of an air conditioner, wherein, The air conditioner comprises a compression refrigeration cycle system partially in an outdoor unit of the air conditioner, a sound attenuation device is arranged in a fluid path of the compression refrigeration cycle system in the outdoor unit, and the method comprises: obtaining sound attenuation amounts of the sound attenuation device corresponding to different refrigerant medium flow velocities; determining a plurality of medium flow velocity point values corresponding to sound attenuation amount amplitudes; controlling the refrigerant to flow according to the plurality of medium flow velocity point values during frequency conversion operation of the compressor; wherein the step of determining the plurality of medium flow velocity point values corresponding to the sound attenuation amount amplitudes further comprises: calculating a difference between each of the medium flow velocity point values and a preset fluctuation value, and a sum of the medium flow velocity point values and the preset fluctuation value, to obtain a plurality of medium flow velocity interval values; controlling the refrigerant to flow according to the plurality of medium flow velocity interval values during frequency conversion operation of the compressor; the sound attenuation device is a single-expansion muffler connected between an exhaust end of the compressor and any heat exchanger of the compression refrigeration cycle system; the air conditioner further comprises: an airflow velocity sensor for detecting the refrigerant medium airflow velocity; and a refrigerant flow rate controller arranged between the exhaust end of the compressor and the sound attenuation device for adjusting the refrigerant medium airflow velocity.

2. The method according to claim 1, wherein the compressor is a frequency conversion compressor with a working frequency of 20-60 Hz; the flow rate range of the refrigerant of the compression refrigeration cycle system is 3-15 m / s.

3. The method of claim 1, wherein, in the step of controlling the refrigerant to flow according to the plurality of medium flow velocity point values during frequency conversion operation of the compressor: during frequency conversion operation of the compressor, the greater the working frequency of the compressor, the greater the corresponding medium flow velocity point value.

4. The method according to claim 3, wherein the single-expansion muffler comprises an expansion pipe and connecting pipes connected to both ends of the expansion pipe, wherein the ratio of the inner diameter of the expansion pipe to the inner diameter of the connecting pipes is 2:1-4:1, and the length of the expansion pipe is 80-120 mm.

5. The method of claim 1, wherein, further comprising: obtaining noise data in the outdoor unit when the compressor works at different working frequencies; analyzing the noise data to obtain frequency spectrum data; correcting the plurality of medium flow velocity point values according to the frequency spectrum data.

6. The method according to claim 5, wherein the noise data is measured by an acoustic microphone; the frequency spectrum data is generated by a frequency spectrum analyzer.

7. An air conditioner, comprising: a compression refrigeration cycle system partially in an outdoor unit of the air conditioner; a sound attenuation device arranged in a fluid path of the compression refrigeration cycle system in the outdoor unit; and a control device having a memory and a processor, the memory storing a machine executable program, when the machine executable program is executed by the processor, for implementing the noise reduction method of the air conditioner according to any one of claims 1-6. ​

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