Air conditioner and manufacturing method thereof

Abstract

The present invention provides an air conditioner and a manufacturing method thereof, the manufacturing method comprising a muffler installation step: installing the muffler into the fluid path of the compression refrigeration cycle system in the outdoor unit; a peak noise detection step: detecting the peak noise frequency corresponding to the peak noise in the outdoor unit when the compressor in the compression refrigeration cycle system is working; a refrigerant ratio determination step: determining the ratio of the refrigerant to be filled in the compression refrigeration cycle system according to the peak noise frequency, wherein the refrigerant to be filled is selected to be composed of at least two different types of refrigerants; a refrigerant filling step: filling the refrigerant with the determined ratio into the compression refrigeration cycle system. The advantages of the present invention are that the working noise in the outdoor unit can be significantly reduced, and the user's comfort experience can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a manufacturing method thereof. Background Art

[0002] In recent years, with the continuous development of science and technology and the continuous improvement of living standards, users have also put forward higher requirements for the comfort of air conditioners. In existing air conditioners, especially parking air conditioners, the compressor in the compression refrigeration cycle system produces a lot of working noise in the outdoor unit when working, which has caused users to complain for a long time. Although the compression refrigeration cycle system is also equipped with a single expansion chamber muffler, the single expansion chamber muffler has a poor muffler effect on narrowband frequencies, so it needs to be improved. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an air conditioner and a manufacturing method thereof. The manufacturing method can significantly reduce the working noise in the outdoor unit and improve the user's comfort experience.

[0004] According to a first aspect of the present invention, the present invention provides a manufacturing method for an air conditioner, the air conditioner comprising a compression refrigeration cycle system partially located in an outdoor unit of the air conditioner, the manufacturing method comprising:

[0005] Installation steps of the silencer: Install the silencer into the fluid path of the compression refrigeration cycle system in the outdoor unit;

[0006] Peak noise detection step: Detect the peak noise frequency corresponding to the peak noise in the outdoor unit when the compressor in the compression refrigeration cycle system is working. The peak noise is defined as: for the working noise generated by the compressor during operation, if its maximum peak intensity is at least 20% greater than its average intensity, then the working noise corresponding to the maximum peak intensity is the peak noise;

[0007] Refrigerant ratio determination step: determining a ratio scheme of the refrigerant to be charged in the compression refrigeration cycle system according to the peak noise frequency, wherein the refrigerant to be charged is selected to be composed of at least two different types of refrigerants;

[0008] Refrigerant charging steps: Charge the refrigerant with the determined ratio into the compression refrigeration cycle system.

[0009] Optionally, in the refrigerant ratio determination step, the refrigerant to be filled in the compression refrigeration cycle system is further selected to consist of two or three of R32 refrigerant, R125 refrigerant, R134a refrigerant and R143a refrigerant.

[0010] Optionally, in the refrigerant ratio determination step, the ratio of the refrigerant to be charged is determined according to the following rules:

[0011] If the peak noise frequency is in any of the intervals of (0Hz, 350Hz], (550Hz, 650Hz], (1200Hz, 1300Hz], and (1600Hz, 1850Hz], the ratio of the refrigerant to be charged is a mixed refrigerant consisting of 44% R125 refrigerant, 4% R134a refrigerant, and 52% R143a refrigerant;

[0012] If the peak noise frequency is in any of the intervals of (350Hz, 400Hz], (650Hz, 750Hz], (950Hz, 1050Hz], and (1450Hz, 1600Hz], the ratio of the refrigerant to be charged is 50% R32 refrigerant and 50% R125 refrigerant to form a mixed refrigerant;

[0013] If the peak noise frequency is in any of the intervals of (400Hz, 550Hz], (750Hz, 950Hz], (1050Hz, 1200Hz], and (1300Hz, 1450Hz], the ratio of the refrigerant to be filled is a mixed refrigerant consisting of 23% R32 refrigerant, 25% R125 refrigerant, and 52% R134a refrigerant.

[0014] Optionally, the compressor working program setting step: setting the compressor working program so that the exhaust temperature of the compressor is set to 60°C ~ 70°C and the exhaust pressure is set to 3.0Mpa ~ 4.0Mpa.

[0015] Optionally, in the silencer installation step, the silencer is selected as a series silencer, which is connected between the exhaust end of the compressor and any heat exchanger of the compression refrigeration cycle system.

[0016] Optionally, the tandem silencer comprises a first single expansion chamber silencer and a second single expansion chamber silencer connected end to end; and

[0017] The expansion chamber diameter of the first single expansion chamber muffler is greater than the expansion chamber diameter of the second single expansion chamber muffler, and the expansion chamber length of the first single expansion chamber muffler is less than the expansion chamber length of the second single expansion chamber muffler.

[0018] Optionally, the peak noise detection step comprises:

[0019] Obtain the noise data inside the outdoor unit when the compressor is working;

[0020] Analyzing the noise data to obtain spectrum data of the noise data; and

[0021] Determine whether peak noise exists based on the frequency spectrum data of the noise data; if it exists, further determine the corresponding peak noise frequency.

[0022] According to a second aspect of the present invention, the present invention provides an air conditioner, which is manufactured by any one of the above manufacturing methods.

[0023] According to a third aspect of the present invention, the present invention provides an air conditioner, comprising:

[0024] A compression refrigeration cycle system is partially located in an outdoor unit of an air conditioner, the compression refrigeration cycle system is filled with a mixed refrigerant consisting of two or three of refrigerant R32, refrigerant R125, refrigerant R134a and refrigerant R143a, and a peak noise generated in the outdoor unit when a compressor in the compression refrigeration cycle system is operating has a peak noise frequency; and

[0025] The series muffler is connected between the exhaust end of the compressor and any heat exchanger in the compression refrigeration cycle system.

[0026] Optionally, the compression refrigeration cycle system is further configured such that:

[0027] The peak noise frequency is in any of the intervals of (0 Hz, 350 Hz], (550 Hz, 650 Hz], (1200 Hz, 1300 Hz], and (1600 Hz, 1850 Hz], and the refrigerant charged in the compression refrigeration cycle system is a mixed refrigerant consisting of 44% R125 refrigerant, 4% R134a refrigerant, and 52% R143a refrigerant; or

[0028] The peak noise frequency is in any of the intervals of (350Hz, 400Hz], (650Hz, 750Hz], (950Hz, 1050Hz], and (1450Hz, 1600Hz], and the refrigerant charged in the compression refrigeration cycle system is a mixed refrigerant consisting of 50% R32 refrigerant and 50% R125 refrigerant; or

[0029] The peak noise frequency is in any of the intervals of (400Hz, 550Hz], (750Hz, 950Hz], (1050Hz, 1200Hz], and (1300Hz, 1450Hz]. The refrigerant filled in the compression refrigeration cycle system is a mixed refrigerant consisting of 23% R32 refrigerant, 25% R125 refrigerant, and 52% R134a refrigerant.

[0030] The air conditioner and its manufacturing method of the present invention first install a silencer in the fluid path of the compression refrigeration cycle system in the outdoor unit, then detect the peak noise frequency corresponding to the peak noise in the outdoor unit when the compressor in the compression refrigeration cycle system is working, then determine the ratio of the refrigerant to be filled in the compression refrigeration cycle system according to the peak noise frequency, and finally fill the refrigerant with the determined ratio into the compression refrigeration cycle system. Innovatively, at least two different types of refrigerants are mixed and filled into the fluid path of the compression refrigeration cycle system according to the peak noise frequency, thereby minimizing the working noise in the outdoor unit and improving the user experience.

[0031] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 is a structural schematic diagram of an air conditioner according to an embodiment of the present invention;

[0034] Figure 2 is a schematic structural diagram of a series muffler according to an embodiment of the present invention;

[0035] Figure 3 It is the silencer transmission loss curve of the series silencer under different refrigerant ratio schemes;

[0036] Figure 4 is a flow chart of a method for manufacturing an air conditioner according to an embodiment of the present invention;

[0037] Figure 5 is a flow chart of peak noise detection according to one embodiment of the present invention. DETAILED DESCRIPTION

[0038] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] The embodiment of the present invention first provides an air conditioner 10. Figure 1 is a schematic diagram of the structure of an air conditioner 10 according to an embodiment of the present invention, referring to Figure 1 The air conditioner 10 may be a split-type air conditioner 10, which generally includes an indoor unit 110, an outdoor unit 120 and a compression refrigeration cycle system 200, wherein the compression refrigeration cycle system 200 is partially located in the outdoor unit 120 of the air conditioner 10, and includes at least a compressor 210, a heat exchanger 220, a refrigerant pipeline 230 and other components. Since the working principle of the compression refrigeration cycle system 200 is well known to those skilled in the art, it will not be repeated here.

[0040] The air conditioner 10 of the present invention further includes a silencer 300 , which can be a series silencer connected between the exhaust end of the compressor 210 and any heat exchanger of the compression refrigeration cycle system 200 .

[0041] Figure 2 is a schematic diagram of the structure of a series muffler according to an embodiment of the present invention, referring to Figure 2 The tandem muffler at least includes a first single expansion chamber muffler 310 and a second single expansion chamber muffler 320, wherein the first single expansion chamber muffler 310 and the second single expansion chamber muffler 320 are connected end to end, wherein the expansion chamber diameter of the first single expansion chamber muffler 310 is greater than the expansion chamber diameter of the second single expansion chamber muffler 320, and the expansion chamber length of the first single expansion chamber muffler 310 is less than the expansion chamber length of the second single expansion chamber muffler 320. In other words, the first single expansion chamber muffler 310 is a short and thick muffler, and the second single expansion chamber muffler 320 is a slender muffler.

[0042] In this embodiment, the first single expansion chamber muffler 310 and the second single expansion chamber muffler 320 are an integrated structure. For the first single expansion chamber muffler 310, the diameter of its expansion chamber is about 12 to 16 times the diameter of the connecting pipes at both ends, and the length of the expansion chamber is about 20 mm to 60 mm. For the second single expansion chamber muffler 320, the diameter of its expansion chamber is about 4 to 8 times the diameter of the connecting pipes at both ends, and the length of the expansion chamber is about 80 to 120 mm.

[0043] Through actual tests, compared with the use of a single single expansion chamber muffler, at the same muffler frequency, the muffler volume of the series muffler composed of the first single expansion chamber muffler 310 and the second single expansion chamber muffler 320 is greatly improved, and it has a significant muffler effect on both broadband frequency noise and narrowband frequency noise, especially for parking air conditioners, it can effectively reduce the frequency noise of parking air conditioners within 1500Hz, improve the user's driving environment, and enhance the user's driving experience.

[0044] During an in-depth study of the muffler effect of the series muffler, the inventor unexpectedly discovered that when at least two different types of refrigerants are mixed and charged into the refrigerant pipeline 230, there are large differences in the maximum muffler volume and the bandwidth of the muffler frequency band of the series muffler.

[0045] In this embodiment, in order to eliminate the working noise in the outdoor unit 120 when the compressor 210 is working to the maximum extent, three commonly used refrigerants are finally determined after a large number of experiments, namely: R410a refrigerant, R407c refrigerant and R404a refrigerant. The composition, ratio and price of the three refrigerants can be referred to the following table:

[0046]

[0047] Using the CAE acoustic simulation platform, the three refrigerants are respectively charged into the fluid path of the compression refrigeration cycle system 200, and the following results can be obtained: Figure 3 The silencer transmission loss curve of the series silencer under different refrigerant ratio schemes is shown. From this, it can be seen that for silencers of the same structural form, when using different types of mixed refrigerants, there are differences in the maximum silencer volume and the bandwidth of the silencer frequency band.

[0048] For the air conditioner 10 in the embodiment of the present invention, an acoustic microphone can be used to measure the noise data in the outdoor unit 120 when the compressor 210 is working, and then a spectrum analyzer can be used to analyze the noise data to obtain a spectrum graph. Based on the spectrum graph, the peak noise frequency in the outdoor unit 120 when the air conditioner 10 is working is determined, and the refrigerant to be filled is reasonably selected according to the noise frequency, thereby minimizing the working noise in the outdoor unit 120.

[0049] Combination Figure 3 , the proportion of the refrigerant to be charged can be selected according to the following logic:

[0050] (1) If the peak noise frequency in the outdoor unit 120 is in any of the intervals of (0 Hz, 350 Hz], (550 Hz, 650 Hz], (1200 Hz, 1300 Hz], and (1600 Hz, 1850 Hz], it is recommended that the refrigerant filled in the compression refrigeration cycle system 200 be a mixed refrigerant consisting of 44% R125 refrigerant, 4% R134a refrigerant, and 52% R143a refrigerant, that is, R404a refrigerant.

[0051] (2) If the peak noise frequency in the outdoor unit 120 is in any of the ranges of (350 Hz, 400 Hz], (650 Hz, 750 Hz], (950 Hz, 1050 Hz], and (1450 Hz, 1600 Hz], it is recommended that the refrigerant filled in the compression refrigeration cycle system 200 be a mixed refrigerant consisting of 50% R32 refrigerant and 50% R125 refrigerant, that is, R410a refrigerant.

[0052] (3) If the peak noise frequency in the outdoor unit 120 is in any of the ranges of (400 Hz, 550 Hz], (750 Hz, 950 Hz], (1050 Hz, 1200 Hz], and (1300 Hz, 1450 Hz], it is recommended that the refrigerant filled in the compression refrigeration cycle system 200 be a mixed refrigerant consisting of 23% R32 refrigerant, 25% R125 refrigerant, and 52% R134a refrigerant, that is, R407c refrigerant.

[0053] The present invention further provides a method for manufacturing an air conditioner 10. It should be noted that the air conditioner 10 of the above embodiment can be manufactured by, but is not limited to, this manufacturing method. Figure 4 is a flowchart of a method for manufacturing an air conditioner 10 according to an embodiment of the present invention, referring to Figure 4 The manufacturing method at least includes the following steps S102 to S108.

[0054] S102 is a step of installing the silencer 300 , in which the silencer 300 is installed in the fluid path of the compression refrigeration cycle system 200 in the outdoor unit 120 .

[0055] S104 is a peak noise detection step, which detects the peak noise frequency corresponding to the peak noise in the outdoor unit 120 when the compressor 210 in the compression refrigeration cycle system 200 is working. The peak noise is defined as: for the working noise generated by the compressor 210 during operation, if its maximum peak intensity is at least 20% greater than its average intensity, then the working noise corresponding to the maximum peak intensity is the peak noise.

[0056] S106 is a step of determining a ratio of refrigerant to be charged into the compression refrigeration cycle system 200 according to the peak noise frequency, wherein the refrigerant to be charged is selected to be composed of at least two different types of refrigerants.

[0057] S108 is a refrigerant filling step, in which the refrigerant with the determined proportioning scheme is filled into the compression refrigeration cycle system 200.

[0058] The manufacturing method for the air conditioner 10 of the present invention first installs the silencer 300 into the fluid path of the compression refrigeration cycle system 200 in the outdoor unit 120, then detects the peak noise frequency corresponding to the peak noise in the outdoor unit 120 when the compressor 210 in the compression refrigeration cycle system 200 is working, then determines the ratio of the refrigerant to be filled in the compression refrigeration cycle system 200 according to the peak noise frequency, and finally fills the refrigerant with the determined ratio into the compression refrigeration cycle system 200. Innovatively, at least two different types of refrigerants are mixed and filled into the fluid path of the compression refrigeration cycle system 200 according to the peak noise frequency, thereby minimizing the working noise in the outdoor unit 120 and improving the user experience.

[0059] In the refrigerant ratio determination step, the refrigerant to be filled in the compression refrigeration cycle system 200 may be composed of two or three of R32 refrigerant, R125 refrigerant, R134a refrigerant and R143a refrigerant.

[0060] Specifically, the ratio of the refrigerant to be charged can be determined according to the following rules:

[0061] 1. If the peak noise frequency is in any of the intervals of (0Hz, 350Hz], (550Hz, 650Hz], (1200Hz, 1300Hz], and (1600Hz, 1850Hz], the ratio of the refrigerant to be charged is a mixed refrigerant consisting of 44% R125 refrigerant, 4% R134a refrigerant and 52% R143a refrigerant.

[0062] 2. If the peak noise frequency is in any of the intervals of (350Hz, 400Hz], (650Hz, 750Hz], (950Hz, 1050Hz], and (1450Hz, 1600Hz], the ratio of the refrigerant to be charged is a mixed refrigerant of 50% R32 refrigerant and 50% R125 refrigerant.

[0063] 3. If the peak noise frequency is in any of the intervals of (400Hz, 550Hz], (750Hz, 950Hz], (1050Hz, 1200Hz], and (1300Hz, 1450Hz], the ratio of the refrigerant to be charged is a mixed refrigerant consisting of 23% R32 refrigerant, 25% R125 refrigerant and 52% R134a refrigerant.

[0064] As mentioned above, the mixed refrigerant composed of 44% R125 refrigerant, 4% R134a refrigerant and 52% R143a refrigerant is also called R404a refrigerant, the mixed refrigerant composed of 50% R32 refrigerant and 50% R125 refrigerant is also called R410a refrigerant, and the mixed refrigerant composed of 23% R32 refrigerant, 25% R125 refrigerant and 52% R134a refrigerant is also called R407c refrigerant. R404a refrigerant, R410a refrigerant and R407c are all commonly used refrigerants on the market. The present invention makes a reasonable selection of commonly used refrigerants, thereby reducing the working noise in the outdoor unit 120 and improving the user's comfort experience.

[0065] In an optional embodiment, the manufacturing method may further include a step of setting the working program of the compressor 210 at S110, that is, setting the working program of the compressor 210 so that the exhaust temperature of the compressor 210 is set to 60°C to 70°C and the exhaust pressure is set to 3.0Mpa to 4.0Mpa. Since this step is an electronically controlled step, it can be executed at any link without affecting the execution of steps S102 to S108.

[0066] In the refrigerant charging step, the charging amount and charging pressure of the refrigerant can be controlled so that the normal pipeline pressure of the compression refrigeration cycle system 200 in the non-operating state is ≤4.5Mpa.

[0067] Figure 5 is a flowchart of peak noise detection according to an embodiment of the present invention, referring to Figure 5 , S104 peak noise frequency detection step may include:

[0068] S1041, obtaining noise data in the outdoor unit 120 when the compressor 210 is working.

[0069] In this step, noise data may be measured by an acoustic microphone.

[0070] S1042, analyzing the noise data to obtain frequency spectrum data of the noise data.

[0071] In this step, the spectrum data may be generated by a spectrum analyzer.

[0072] S1043, determining whether peak noise exists according to the frequency spectrum data of the noise data.

[0073] S1044: If it exists, further determine its corresponding peak noise frequency.

[0074] By analyzing the above data, in order to solve the problem of frequency noise within 1500Hz generated by the parking air conditioner 10, a series muffler is used with mixed refrigerant noise reduction technology to minimize the working noise in the outdoor unit 120 when the compressor 210 is working, thereby improving the user's driving environment, improving driving safety and comfort experience.

[0075] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A method for manufacturing an air conditioner, the air conditioner comprising a compression refrigeration cycle system partially located in an outdoor unit of the air conditioner, the method comprising: The silencer installation step includes: installing the silencer into the fluid path of the compression refrigeration cycle system in the outdoor unit, wherein the silencer is selected as a series silencer connected between the exhaust end of the compressor of the compression refrigeration cycle system and any heat exchanger of the compression refrigeration cycle system; Peak noise detection step: detecting the peak noise frequency corresponding to the peak noise in the outdoor unit when the compressor in the compression refrigeration cycle system is working, wherein the peak noise is defined as follows: for the working noise generated by the compressor during operation, if its maximum peak intensity is at least 20% greater than its average intensity, then the working noise corresponding to the maximum peak intensity is the peak noise; Refrigerant ratio determination step: determining a ratio scheme of the refrigerant to be charged into the compression refrigeration cycle system according to the peak noise frequency, wherein the refrigerant to be charged is selected to be composed of two or three of R32 refrigerant, R125 refrigerant, R134a refrigerant and R143a refrigerant; Refrigerant filling step: Filling the refrigerant with a determined ratio into the compression refrigeration cycle system, wherein the ratio of the refrigerant to be filled is determined according to the following rules: If the peak noise frequency is in any of the intervals of (0 Hz, 350 Hz], (550 Hz, 650 Hz], (1200 Hz, 1300 Hz], and (1600 Hz, 1850 Hz], the ratio of the refrigerant to be charged is a mixed refrigerant consisting of 44% R125 refrigerant, 4% R134a refrigerant, and 52% R143a refrigerant; If the peak noise frequency is in any of the intervals of (350Hz, 400Hz], (650Hz, 750Hz], (950Hz, 1050Hz], and (1450Hz, 1600Hz], the ratio of the refrigerant to be charged is 50% R32 refrigerant and 50% R125 refrigerant to form a mixed refrigerant; If the peak noise frequency is in any of the intervals of (400Hz, 550Hz], (750Hz, 950Hz], (1050Hz, 1200Hz], and (1300Hz, 1450Hz], the ratio of the refrigerant to be filled is a mixed refrigerant consisting of 23% R32 refrigerant, 25% R125 refrigerant, and 52% R134a refrigerant.

2. The manufacturing method according to claim 1, further comprising: The compressor working program setting step is to set the working program of the compressor so that the exhaust temperature of the compressor is set to 60°C~70°C and the exhaust pressure is set to 3.0Mpa~4.0Mpa.

3. The manufacturing method according to claim 1, wherein: In the silencer installation step, the silencer is selected as a series silencer, which is connected between the exhaust end of the compressor and any heat exchanger of the compression refrigeration cycle system.

4. The manufacturing method according to claim 1, wherein: The tandem muffler comprises a first single expansion chamber muffler and a second single expansion chamber muffler connected end to end; and The expansion chamber diameter of the first single expansion chamber muffler is greater than the expansion chamber diameter of the second single expansion chamber muffler, and the expansion chamber length of the first single expansion chamber muffler is less than the expansion chamber length of the second single expansion chamber muffler.

5. The manufacturing method according to claim 1, wherein: The peak noise detection step comprises: Acquiring noise data in the outdoor unit when the compressor is working; Analyzing the noise data to obtain frequency spectrum data of the noise data; and Determine whether the peak noise exists according to the frequency spectrum data of the noise data; if it exists, further determine the corresponding peak noise frequency.

6. An air conditioner manufactured by the manufacturing method according to any one of claims 1 to 5.

7. An air conditioner, comprising: A compression refrigeration cycle system is partially located in the outdoor unit of the air conditioner, the compression refrigeration cycle system is filled with a mixed refrigerant consisting of two or three of refrigerant R32, refrigerant R125, refrigerant R134a and refrigerant R143a, and the peak noise generated in the outdoor unit when the compressor in the compression refrigeration cycle system is working has a peak noise frequency; as well as A series muffler connected between the exhaust end of the compressor and any heat exchanger of the compression refrigeration cycle system; Wherein, the compression refrigeration cycle system is further configured such that: The peak noise frequency is in any one of the intervals of (0 Hz, 350 Hz], (550 Hz, 650 Hz], (1200 Hz, 1300 Hz], and (1600 Hz, 1850 Hz], and the refrigerant filled in the compression refrigeration cycle system is a mixed refrigerant consisting of 44% R125 refrigerant, 4% R134a refrigerant and 52% R143a refrigerant; or The peak noise frequency is in any one of the intervals of (350 Hz, 400 Hz], (650 Hz, 750 Hz], (950 Hz, 1050 Hz], and (1450 Hz, 1600 Hz], and the refrigerant filled in the compression refrigeration cycle system is a mixed refrigerant consisting of 50% R32 refrigerant and 50% R125 refrigerant; or The peak noise frequency is in any one of the intervals of (400 Hz, 550 Hz], (750 Hz, 950 Hz], (1050 Hz, 1200 Hz], and (1300 Hz, 1450 Hz]. The refrigerant filled in the compression refrigeration cycle system is a mixed refrigerant consisting of 23% R32 refrigerant, 25% R125 refrigerant, and 52% R134a refrigerant.

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