阅读说明：本技术 冷媒流动声检测装置、系统及方法 (Refrigerant flow sound detection device, system and method ) 是由 叶翔 龙书成 谢然 李智 秦望 常文瑞 于 2020-05-19 设计创作，主要内容包括：本发明公开了一种冷媒流动声检测装置。该冷媒流动声检测装置包括检测高压管、检测低压管和检测机构；所述检测高压管的两端分别连接空调高压管的输出端和膨胀阀的高压入口；所述检测低压管的两端分别连接空调低压管的输出端和膨胀阀的低压入口；所述检测机构,设置在所述检测高压管和所述检测低压管上,用于采集空调系统的信号数据,基于所述信号数据获取冷媒流动声的检测分析结果。该冷媒流动声检测装置可实现辅助分析空调系统冷媒流动声的目的,提高测试效率。(The invention discloses a refrigerant flowing sound detection device. The refrigerant flowing sound detection device comprises a detection high-pressure pipe, a detection low-pressure pipe and a detection mechanism; the two ends of the detection high-pressure pipe are respectively connected with the output end of the air-conditioning high-pressure pipe and the high-pressure inlet of the expansion valve; two ends of the detection low-pressure pipe are respectively connected with the output end of the air-conditioning low-pressure pipe and the low-pressure inlet of the expansion valve; the detection mechanism is arranged on the detection high-voltage tube and the detection low-voltage tube and used for acquiring signal data of an air conditioning system and acquiring a detection and analysis result of flowing sound of a refrigerant based on the signal data. The refrigerant flow sound detection device can achieve the purpose of auxiliary analysis of the refrigerant flow sound of the air conditioning system, and improves the test efficiency.)

1. The refrigerant flow sound detection device is characterized by comprising a detection high-pressure pipe, a detection low-pressure pipe and a detection mechanism; the two ends of the detection high-pressure pipe are respectively connected with the output end of the air-conditioning high-pressure pipe and the high-pressure inlet of the expansion valve; two ends of the detection low-pressure pipe are respectively connected with the output end of the air-conditioning low-pressure pipe and the low-pressure inlet of the expansion valve; the detection mechanism is arranged on the detection high-voltage tube and the detection low-voltage tube and used for acquiring signal data of an air conditioning system and acquiring a detection and analysis result of flowing sound of a refrigerant based on the signal data.

2. The acoustic detection apparatus for detecting a flow of refrigerant according to claim 1, further comprising a pipe connector and an expansion valve connector, wherein the pipe connector is used for connecting an output end of the high pressure pipe of the air conditioner with the detection high pressure pipe, and for connecting an output end of the low pressure pipe of the air conditioner with the detection low pressure pipe, and the expansion valve connector is used for connecting the detection high pressure pipe with a high pressure inlet of the expansion valve, and for connecting the detection low pressure pipe with a low pressure inlet of the expansion valve.

3. The refrigerant flow sound detection apparatus according to claim 2, wherein the detection mechanism includes a data collector, and a pressure sensor assembly and a temperature sensor assembly connected to the data collector; the pressure sensor assembly is arranged on the detection high-pressure pipe and the detection low-pressure pipe, is close to one side of the pipeline connecting piece, and is used for detecting the pressure of a refrigerant; the temperature sensor assembly is arranged on the detection high-pressure pipe and the detection low-pressure pipe, is close to one side of the expansion valve connecting piece and is used for detecting the temperature of the refrigerant.

4. The refrigerant flow sound detecting apparatus as claimed in claim 3, wherein the pressure sensor assembly includes a high pressure sensor and a low pressure sensor; the high-pressure sensor is arranged on the detection high-pressure pipe and used for collecting the refrigerant pressure of the detection high-pressure pipe; the low-pressure sensor is arranged on the detection high-pressure pipe and used for collecting the steam pressure of the detection low-pressure pipe;

the temperature sensor assembly comprises a high-pressure temperature sensor array and a low-pressure temperature sensor array; the high-pressure temperature sensor array is uniformly distributed along the radial direction of the detection high-pressure pipe and is used for collecting the distribution of the temperature of a refrigerant in the detection high-pressure pipe; the low-pressure temperature sensor array is uniformly distributed along the radial direction of the low-pressure detection pipe and is used for collecting the distribution of the temperature of a refrigerant in the low-pressure detection pipe.

5. The refrigerant flow sound detecting apparatus according to claim 2, wherein the detecting mechanism further includes a vibration sensor connected to the data collector; the vibration sensor is arranged on the expansion valve connecting piece and used for detecting a vibration signal of the expansion valve.

6. The refrigerant flow sound detecting device as claimed in claim 2, wherein the pipe connection member includes a connection body, a first connection member and a second connection member provided on the connection body; the first connecting piece is provided with a first connecting hole and a first reaming hole; the first connecting hole is used for connecting the output end of the air conditioner high-voltage tube and the detection high-voltage tube; the first counterbore is used to fill a first seal; the second connecting piece is provided with a second connecting hole and a second reaming hole; the second connecting hole is used for connecting the output end of the air conditioner low-voltage pipe and the detection low-voltage pipe; the second counterbore is used to fill a second seal.

7. A refrigerant flow sound detection system, comprising an air conditioner high pressure pipe, an air conditioner low pressure pipe, an expansion valve and a refrigerant flow sound detection device according to any one of claims 1 to 6; one end of the detection high-voltage tube is connected with the output end of the air conditioner high-voltage tube, and the other end of the detection high-voltage tube is connected with the high-voltage inlet of the expansion valve; one end of the detection low-pressure pipe is connected with the output end of the air conditioner low-pressure pipe, and the other end of the detection low-pressure pipe is connected with the low-pressure inlet of the expansion valve.

8. A refrigerant flow sound detection method is characterized by comprising the following steps:

receiving signal data collected by a detection mechanism; the signal data comprises pressure data and temperature data, or vibration data;

performing data analysis on the pressure data and the temperature data to obtain a detection and analysis result of refrigerant flow sound; or carrying out data analysis on the vibration data to obtain a detection and analysis result of the refrigerant flowing sound.

9. The method for detecting refrigerant flow noise according to claim 8, wherein the performing data analysis on the vibration data to obtain a result of detection and analysis of refrigerant flow noise includes:

dividing according to a preset bandwidth segment based on a signal bandwidth corresponding to the vibration data to obtain at least one bandwidth segment;

calculating the vibration data in the frequency band segments to obtain acoustic parameters corresponding to each frequency band segment;

and analyzing based on the acoustic parameters to obtain the detection and analysis result of the flowing sound of the refrigerant.

10. The method for detecting flowing refrigerant noise according to claim 8, wherein the performing data analysis on the pressure data and the temperature data to obtain a detection analysis result of flowing refrigerant noise includes:

acquiring a refrigerant saturation temperature corresponding to the pressure data according to the pressure data;

and analyzing the supercooling degree and/or the superheat degree of the inlet of the expansion valve based on the temperature data and the saturation temperature of the refrigerant to obtain a detection and analysis result of the flowing sound of the refrigerant.

Technical Field

The invention relates to the technical field of vehicle NVH, in particular to a refrigerant flow sound detection device, system and method.

Background

The NVH problem of the automobile air conditioning system has great influence on vibration noise in an automobile in an idling state. The NVH performance of the air conditioning system not only relates to the single part, system matching and software calibration of parts, but also relates to the matching of an engine system and the heat management of a front-end cooling module, and has close relation with the temperature and the humidity of the environment, complex influence factors and strong comprehensiveness.

Refrigerant flow sound is the vibration noise problem which has the strongest comprehensiveness and is most closely related to the thermodynamic state of the idle air conditioning system. Because the frequency range is wide, the frequency is high, and the noise is transmitted through a refrigerant pipeline and does not belong to air sound or structural sound, the traditional automobile NVH detection method has limitation on detection of refrigerant flowing sound and has poor effect.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the current refrigerant flow sound detects has the problem of limitation and poor effect.

In order to solve the above technical problem, an embodiment of the present invention provides a refrigerant flow sound detection apparatus, including a detection high-pressure pipe, a detection low-pressure pipe, and a detection mechanism; the two ends of the detection high-pressure pipe are respectively connected with the output end of the air-conditioning high-pressure pipe and the high-pressure inlet of the expansion valve; two ends of the detection low-pressure pipe are respectively connected with the output end of the air-conditioning low-pressure pipe and the low-pressure inlet of the expansion valve; the detection mechanism is arranged on the detection high-voltage tube and the detection low-voltage tube and used for acquiring signal data of an air conditioning system and acquiring a detection and analysis result of flowing sound of a refrigerant based on the signal data.

Preferably, the refrigerant flow sound detection device provided by the embodiment of the present invention further includes a pipeline connection member and an expansion valve connection member, the pipeline connection member is configured to connect the output end of the air-conditioning high-pressure pipe and the detection high-pressure pipe, and is also configured to connect the output end of the air-conditioning low-pressure pipe and the detection low-pressure pipe, and the expansion valve connection member is configured to connect the detection high-pressure pipe and a high-pressure inlet of the expansion valve, and is also configured to connect the detection low-pressure pipe and a low-pressure inlet of the expansion valve.

Preferably, the detection mechanism comprises a data collector, and a pressure sensor assembly and a temperature sensor assembly which are connected with the data collector; the pressure sensor assembly is arranged on the detection high-pressure pipe and the detection low-pressure pipe, is close to one side of the pipeline connecting piece, and is used for detecting the pressure of a refrigerant; the temperature sensor assembly is arranged on the detection high-pressure pipe and the detection low-pressure pipe, is close to one side of the expansion valve connecting piece and is used for detecting the temperature of the refrigerant.

Preferably, the pressure sensor assembly comprises a high pressure sensor and a low pressure sensor; the high-pressure sensor is arranged on the detection high-pressure pipe and used for collecting the refrigerant pressure of the detection high-pressure pipe; the low-pressure sensor is arranged on the detection high-pressure pipe and used for collecting the steam pressure of the detection low-pressure pipe;

the temperature sensor assembly comprises a high-pressure temperature sensor array and a temperature sensor array; the high-pressure temperature sensor array is uniformly distributed along the radial direction of the detection high-pressure pipe and is used for collecting the distribution of the temperature of a refrigerant in the detection high-pressure pipe; the low-pressure temperature sensor array is uniformly distributed along the radial direction of the low-pressure detection pipe and is used for collecting the distribution of the temperature of a refrigerant in the low-pressure detection pipe.

Preferably, the detection mechanism further comprises a vibration sensor connected with the data acquisition unit; the vibration sensor is arranged on the expansion valve connecting piece and used for detecting a vibration signal of the expansion valve.

Preferably, the pipeline connecting piece comprises a connecting body, a first connecting piece and a second connecting piece, wherein the first connecting piece and the second connecting piece are arranged on the connecting body; the first connecting piece is provided with a first connecting hole and a first reaming hole; the first connecting hole is used for connecting the output end of the air conditioner high-voltage tube and the detection high-voltage tube; the first counterbore is used to fill a first seal; the second connecting piece is provided with a second connecting hole and a second reaming hole; the second connecting hole is used for connecting the output end of the air conditioner low-voltage pipe and the detection low-voltage pipe; the second counterbore is used to fill a second seal.

The invention provides a refrigerant flowing sound detection device, which comprises a detection high-pressure pipe, a detection low-pressure pipe and a detection mechanism, wherein the detection high-pressure pipe is connected with the detection low-pressure pipe; the two ends of the detection high-pressure pipe are respectively connected with the output end of the air-conditioning high-pressure pipe and the high-pressure inlet of the expansion valve, and the two ends of the detection low-pressure pipe are respectively connected with the output end of the air-conditioning low-pressure pipe and the low-pressure inlet of the expansion valve, so that the signal data of the air-conditioning system are collected through the detection mechanism arranged on the detection high-pressure pipe and the detection low-pressure pipe, the detection and analysis result of the flowing sound of the refrigerant is obtained based on the signal data, and the purpose of auxiliary analysis of the flowing sound of the refrigerant of the air-conditioning system is achieved.

The embodiment of the invention provides a refrigerant flowing sound detection system, which comprises an air conditioner high-pressure pipe, an air conditioner low-pressure pipe, an expansion valve and a refrigerant flowing sound detection device; one end of the detection high-voltage tube is connected with the output end of the air conditioner high-voltage tube, and the other end of the detection high-voltage tube is connected with the high-voltage inlet of the expansion valve; one end of the detection low-pressure pipe is connected with the output end of the air conditioner low-pressure pipe, and the other end of the detection low-pressure pipe is connected with the low-pressure inlet of the expansion valve.

The invention discloses a refrigerant flowing sound detection system, which comprises an air conditioner pipeline, an expansion valve and a refrigerant flowing sound detection device in the embodiment; the air conditioner pipeline is connected with the pipeline connecting piece; the expansion valve is connected with the expansion valve connecting piece to synchronously acquire and detect vibration signals at the expansion valve, the pressure of the refrigerant, the temperature distribution of the refrigerant in all directions of the pipe wall and the like, so that the vibration parameters and the thermodynamic parameters of the refrigerant in the refrigerant flow sound test are subjected to linkage test analysis, and the accuracy of refrigerant flow sound detection is greatly improved.

The embodiment of the invention provides a refrigerant flowing sound detection method, which comprises the following steps:

receiving signal data collected by a detection mechanism; the signal data comprises pressure data and temperature data, or vibration data;

performing data analysis on the pressure data and the temperature data to obtain a detection and analysis result of refrigerant flow sound; or carrying out data analysis on the vibration data to obtain a detection and analysis result of the refrigerant flowing sound.

Preferably, the performing data analysis on the vibration data to obtain a detection analysis result of refrigerant flow sound includes:

dividing according to a preset bandwidth segment based on a signal bandwidth corresponding to the vibration data to obtain at least one bandwidth segment;

calculating the vibration data in the frequency band segments to obtain acoustic parameters corresponding to each frequency band segment;

and analyzing based on the acoustic parameters to obtain the detection and analysis result of the flowing sound of the refrigerant.

Preferably, the performing data analysis on the pressure data and the temperature data to obtain a detection analysis result of the refrigerant flow sound includes:

acquiring a refrigerant saturation temperature corresponding to the pressure data according to the pressure data;

and analyzing the supercooling degree and/or the superheat degree of the inlet of the expansion valve based on the temperature data and the saturation temperature of the refrigerant to obtain a detection and analysis result of the flowing sound of the refrigerant.

The refrigerant flowing sound detection method disclosed by the invention integrates the refrigerant thermodynamic parameters and the acoustic parameters of the vibration data at the expansion valve, so that the refrigerant thermodynamic parameters and the acoustic parameters are combined to be comprehensively analyzed, the existence, the sound type, the flowing condition and the occurrence reason of the refrigerant flowing sound are accurately judged to be analyzed, a tester is assisted to test, and the test efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic view of a refrigerant flow sound detection apparatus according to an embodiment of the present invention;

fig. 2 is a schematic view of a refrigerant flow sound detection device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a temperature sensor array in the acoustic refrigerant flow detection apparatus according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a refrigerant flow sound detection method according to an embodiment of the invention;

FIG. 5 is a detailed diagram of step S20 in FIG. 4;

FIG. 6 is another detailed diagram of step S20 in FIG. 4;

wherein, 1, pipeline connecting piece; 11. a connecting body; 111. a first connecting member; 1111. a first connection hole; 1112. first reaming; 121. a second connecting member; 1211. a second connection hole; 1212. second reaming; 2. an expansion valve connection; 21. a high voltage connection end; 22. a low voltage connection terminal; 23. an expansion valve connection hole; 3. detecting a high-pressure pipe; 4. detecting a low-pressure pipe; 51. a high pressure sensor; 52. a low pressure sensor; 61. a high-pressure temperature sensor array; 62. a low-voltage temperature sensor array; 7. a transparent member.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The invention provides a refrigerant flow sound detection device, as shown in figure 1, comprising a detection high-pressure pipe 3, a detection low-pressure pipe 4 and a detection mechanism (not shown in the figure); the two ends of the detection high-voltage tube 3 are respectively connected with the output end of the air-conditioning high-voltage tube and the high-voltage inlet of the expansion valve; two ends of the detection low-pressure pipe 4 are respectively connected with the output end of the air-conditioning low-pressure pipe and the low-pressure inlet of the expansion valve; and the detection mechanism is arranged on the detection high-pressure pipe 3 and the detection low-pressure pipe 4 and is used for acquiring signal data of the air conditioning system and acquiring a detection and analysis result of refrigerant flowing sound based on the signal data.

The refrigerant flowing sound detection device can be used for detecting in a whole vehicle, and is convenient to detect under the actual operation condition of an air conditioning system; the method can also be applied to detection on a rack and is compatible with different application scenes. If the detection is carried out on the whole vehicle, the air conditioner pipeline needs to be modified, namely, the part of the air conditioner pipeline, which is connected with the expansion valve, is cut short, and an access space of the refrigerant flowing sound detection device is reserved, so that the refrigerant flowing sound detection device is installed in the whole vehicle for detection. If the detection device is applied to the bench for detection, the device can be directly installed. It should be noted that the installation method of the refrigerant flow sound detection device is the same as the connection method of the expansion valve and the air conditioning pipeline (including the air conditioning high pressure pipe and the air conditioning low pressure pipe) in the normal air conditioning system.

Specifically, the refrigerant flow sound detection device further comprises a pipeline connecting piece 1 and an expansion valve connecting piece 2, wherein the pipeline connecting piece 1 is connected with the output end of an air conditioning pipeline in the air conditioning system, namely the pipeline connecting piece 1 is respectively connected with the output end of an air conditioning high-pressure pipe and the output end of an air conditioning low-pressure pipe; the expansion valve connector 2 is connected with the input end of the expansion valve, namely, one end of the detection high-pressure pipe 3 connected with the expansion valve connector 2 extends out of the expansion valve connector 2 to be used as a high-pressure connecting end 21 and is correspondingly connected with the high-pressure inlet of the expansion valve. One end of the detection low-pressure pipe 4, which is connected with the expansion valve connecting piece 2, extends out of the expansion valve connecting piece 2 to serve as a low-pressure connecting end 22 and is correspondingly connected with a low-pressure inlet of the expansion valve, and then is fixedly connected with the expansion valve through an expansion valve connecting hole 23 on the expansion valve connecting piece 2, so that the refrigerant flowing sound detection device is directly installed in an air conditioning system for testing, and the installation is simple and the operation is easy. It should be noted that the air conditioning pipeline and the expansion valve may be system components in an actual air conditioning system, or may be system components in a bench test, which is not limited herein.

The invention provides a refrigerant flow sound detection device, which comprises a detection high-pressure pipe 3, a detection low-pressure pipe 4 and a detection mechanism; the two ends of the high-pressure detection pipe 3 are respectively connected with the output end of the high-pressure air conditioner pipe and the high-pressure inlet of the expansion valve, the two ends of the low-pressure detection pipe 4 are respectively connected with the output end of the low-pressure air conditioner pipe and the low-pressure inlet of the expansion valve, so that signal data of the air conditioner system are collected through detection mechanisms arranged on the high-pressure detection pipe 3 and the low-pressure detection pipe 4, detection and analysis results of flowing sound of a refrigerant are obtained based on the signal data, and the purpose of auxiliary analysis of the flowing sound of the refrigerant of the air conditioner system is achieved.

In one embodiment, as shown in fig. 1, the detection mechanism includes a data collector, and a pressure sensor assembly and a temperature sensor assembly connected to the data collector; the pressure sensor assembly is arranged on the detection high-pressure pipe 3 and the detection low-pressure pipe 4, is close to one side of the pipeline connecting piece 1, and is used for detecting the pressure of a refrigerant; the temperature sensor assembly is arranged on the detection high-pressure pipe 3 and the detection low-pressure pipe 4, is close to one side of the expansion valve connecting piece 2, and is used for detecting the temperature of the refrigerant.

The data acquisition unit is electrically connected with the pressure sensor assembly and the temperature sensor assembly to acquire analog signals output by the pressure sensor assembly and the temperature sensor assembly and analyze the flowing sound of a refrigerant of the air conditioning system according to the analog signals.

Specifically, the expansion valve in the air conditioning system functions as: when the high-pressure normal-temperature refrigerant liquid is output to the expansion valve through the high-pressure pipe of the air conditioner, the refrigerant liquid which is changed into low-temperature low-pressure refrigerant liquid is output to the low-pressure pipe of the air conditioner from the output end of the expansion valve to be quickly evaporated, so that the purpose of absorbing heat to the outside is achieved. It is understood that in the air conditioning system, the output ends of the high and low pressure pipes of the air conditioner are connected to the high and low pressure input ends of the expansion valve, and the operation process is that the high pressure refrigerant liquid is output from the high pressure pipe of the air conditioner to the input end of the expansion valve, and the high pressure refrigerant liquid is changed into the low pressure refrigerant liquid and then is output from the output end of the expansion valve to the low pressure pipe of the air conditioner.

Specifically, the pressure sensor subassembly sets up on detecting high-pressure tube 3 and detecting low-pressure tube 4, be close to one side of tube coupling 1, with gather and detect the refrigerant pressure on high-pressure tube 3 and detecting low-pressure tube 4, simultaneously because this pressure sensor subassembly sets up in one side that is close to tube coupling 1, when solving current refrigerant condensation pressure test, set up pressure sensor in air conditioner high-pressure tube filler, because the input distance of air conditioner high-pressure tube filler to expansion valve is far away, there is the pressure drop, lead to the inaccurate problem of test result. In this embodiment, the pressure sensor assembly is disposed at a side close to the pipe connection member 1 to accurately detect the pressure of the refrigerant at the inlet (i.e., input end) and the pressure of the steam at the outlet (i.e., output end) of the expansion valve, thereby improving the accuracy of the detection of the refrigerant flow noise.

In the embodiment, the pressure sensor assembly is arranged on one side, close to the pipeline connecting piece 1, of the detection high-pressure pipe 3 and the detection low-pressure pipe 4 so as to accurately test the pressure of the refrigerant of the detection high-pressure pipe 3 and the detection low-pressure pipe 4, and thus the accuracy of the detection of the flowing sound of the refrigerant is improved; meanwhile, the temperature sensor assembly is arranged on one side, close to the expansion valve connecting piece 2, of the detection high-pressure pipe 3 and the detection low-pressure pipe 4, so that the temperatures of the detection high-pressure pipe 3 and the detection low-pressure pipe 4 can be synchronously tested, and the degree of supercooling/superheat of the expansion valve can be analyzed.

In one embodiment, as shown in fig. 1 and 3, the pressure sensor assembly includes a high pressure sensor 51 and a low pressure sensor 52; the high-pressure sensor 51 is arranged on the detection high-pressure pipe 3 and used for collecting and detecting the refrigerant pressure of the high-pressure pipe 3; the low-pressure sensor 52 is arranged on the detection high-pressure pipe 3 and is used for collecting and detecting the steam pressure of the low-pressure pipe 4; the temperature sensor assembly comprises a high pressure temperature sensor array 61 and a low pressure temperature sensor array 62; the high-pressure temperature sensor array 61 is uniformly arranged on the inner surface of the pipe wall of the high-pressure pipe 3 and is used for collecting and detecting the temperature distribution of a refrigerant in the high-pressure pipe 3; the low-pressure temperature sensor array 62 is uniformly arranged on the inner surface of the pipe wall of the low-pressure pipe 4 and is used for collecting and detecting the temperature distribution of the refrigerant in the low-pressure pipe 4.

Specifically, in the current refrigerant temperature test, a temperature sensor is generally arranged on the surface of the pipe wall of the high-pressure pipe of the air conditioner, and the temperature difference between the pipe walls of the high-pressure pipe cannot be eliminated, so that a test error is caused. However, when obvious bubbles exist in the refrigerant, the temperatures of different positions of the pipe wall are different, and especially when the refrigerant in the high-pressure pipe of the air conditioner flows in a layered manner, a larger test error is caused. The temperature difference of the pipe wall is not only an important source of the testing error of the supercooling degree and the superheat degree, but also an important parameter of the change of refrigerant flow sound and flowing water sound in the air conditioning system, so that the error of the collected temperature data needs to be reduced.

In this embodiment, the high-pressure temperature sensor array 61 is uniformly arranged on the inner surface of the pipe wall of the low-pressure pipe 4, and the low-pressure temperature sensor array 62 is uniformly arranged on the inner surface of the pipe wall of the low-pressure pipe 4, so that the distribution of the refrigerant temperature in the high-pressure pipe 3 and the low-pressure pipe 4 can be conveniently collected and detected, the analysis of the supercooling degree and the superheat degree of the refrigerant can be conveniently carried out, the defect of the current refrigerant temperature test can be effectively overcome, and the test error can be reduced.

Exemplarily, as shown in fig. 3, it shows a high pressure temperature sensor array 61, the high pressure temperature sensor array 61 is uniformly arranged on the inner surface of the pipe wall of the high pressure pipe 3, i.e. a temperature sensor is arranged at 45 ° intervals along the radial direction of the high pressure pipe 3, so as to form an annular array, i.e. the high pressure temperature sensor array 61; the low-voltage temperature sensor array 62 is arranged in the same manner as the high-voltage temperature sensor array 61, and is not described herein again to avoid repetition.

In this embodiment, the high-pressure sensor 51 is disposed on the high-pressure detection pipe 3, and the low-pressure sensor 52 is disposed on the low-pressure detection pipe 4, so as to synchronously acquire the pressure of the refrigerant (at this time, the refrigerant is in a liquid state) of the high-pressure detection pipe 3 and the steam pressure (at this time, the refrigerant is in a gaseous state) of the low-pressure detection pipe 4; meanwhile, the high-pressure temperature sensor array 61 is uniformly arranged on the inner surface of the pipe wall of the high-pressure pipe 3, and the low-pressure temperature sensor array 62 is uniformly arranged on the inner surface of the pipe wall of the low-pressure pipe 4, so that the distribution of the temperature of the refrigerant in the high-pressure pipe 3 and the low-pressure pipe 4 can be conveniently acquired and detected, the analysis of the supercooling degree and the superheat degree of the refrigerant can be conveniently carried out, the defect of the current refrigerant temperature test can be effectively overcome, and the test error can be reduced.

In one embodiment, as shown in fig. 1, the detection mechanism further includes a vibration sensor connected to the data collector; the vibration sensor is arranged on the expansion valve connecting piece 2 and is used for detecting a vibration signal of the expansion valve.

Specifically, the detection mechanism further comprises a vibration sensor (not shown in the figure) connected with the data acquisition unit; the vibration sensor is arranged on the expansion valve connecting piece 2, so that the vibration signal of the expansion valve is synchronously acquired while the pressure of the refrigerant of the high-pressure pipe 3 and the steam pressure and the temperature of the refrigerant of the low-pressure pipe 4 are acquired and detected, and the flowing sound of the refrigerant is analyzed according to the vibration signal.

In one embodiment, as shown in fig. 1, the high-pressure test pipe 3 and the low-pressure test pipe 4 are both provided with a transparent member 7.

In this embodiment, this transparency 7 specifically can be the hyaline tube that high pressure resistant glass made, this hyaline tube setting is detecting high-pressure tube 3 and detecting low-pressure tube 4 inside, and a week that detects high-pressure tube 3 and detecting low-pressure tube 4 evenly is equipped with the opening, expose this hyaline tube in the external world through this opening, so that the tester can look over the flow state of refrigerant (like refrigerant layering mobile state, the state that mix with the bubble in the refrigerant gaseous state liquid and the state that the refrigerant completely liquid flows), characteristics such as bubble size and distribution directly perceivedly, be convenient for carry out the secondary to the detection and analysis result of the refrigerant mobile sound that refrigerant mobile sound detection device obtained and confirm, reliability and the accuracy of detection are improved.

In one embodiment, as shown in fig. 1 and 2, the pipeline connector 1 includes a connector body 11, a first connector 111 and a second connector 121 provided on the connector body 11; the first connecting piece 111 is provided with a first connecting hole 1111 and a first counterbore 1112; the first connection hole 1111 is used for connecting an air conditioner pipeline and the detection high-pressure pipe 3; first counterbore 1112 is for filling the first seal; the second connecting member 121 is provided with a second connecting hole 1211 and a second counterbore 1212; the second connection hole 1211 is for connecting the air conditioning pipe and the detection low pressure pipe 4; second counterbore 1212 is used to fill the second seal.

Specifically, in order to completely simulate the connection condition of an air conditioning pipeline and an expansion valve in an actual air conditioning system, the actual condition is met, and the authenticity of the test is ensured. In this embodiment, the pipeline connector 1 completely simulates the input end of the expansion valve, so the connector body 11 includes a first through hole and a second through hole, and in order to ensure sealing and ensure that the test environment is not interfered, the through hole needs to be sealed.

In this embodiment, the pipeline connector 1 includes a connector body 11, a first connector 111 and a second connector 121 disposed on the connector body 11, the first connector 111 is provided with a first connection hole 1111 and a first counterbore 1112; the first connection hole 1111 is used for connecting a high-pressure pipe of an air conditioner pipeline and the detection high-pressure pipe 3, and the first counterbore 1112 can be aligned with the first through hole on the pipeline connection member 1 and filled with a first sealing member to realize sealing. Similarly, the second connecting member 121 is provided with a second connecting hole 1211 and a second counterbore 1212; the second connection hole 1211 is used for connecting a low-pressure pipe of the air-conditioning pipeline and the detection low-pressure pipe 4; the first counterbore 1112 can be connected to the second through hole of the pipe connection member 1 and is filled with the first sealing member to achieve sealing, so as to completely simulate the connection condition between the air conditioning pipe and the expansion valve in the air conditioning system, ensure the authenticity of the test, and simultaneously ensure that the test environment is not interfered.

The invention provides a refrigerant flowing sound detection system, which comprises an air conditioner high-pressure pipe, an air conditioner low-pressure pipe, an expansion valve and a refrigerant flowing sound detection device; one end of the detection high-pressure pipe 3 is connected with the output end of the air-conditioning high-pressure pipe, and the other end of the detection high-pressure pipe is connected with the high-pressure inlet of the expansion valve; one end of the detection low-pressure pipe 4 is connected with the output end of the low-pressure pipe of the air conditioner, and the other end of the detection low-pressure pipe is connected with the low-pressure inlet of the expansion valve.

The refrigerant flowing sound detection system provided by the embodiment of the invention comprises an air conditioner high-pressure pipe, an air conditioner low-pressure pipe, an expansion valve and the refrigerant flowing sound detection device; one end of the detection high-pressure pipe 3 is connected with the output end of the air-conditioning high-pressure pipe, and the other end of the detection high-pressure pipe is connected with the high-pressure inlet of the expansion valve; one end of the detection low-voltage tube 4 is connected with the output end of the air conditioner low-voltage tube, and the other end of the detection low-voltage tube is connected with the low-voltage inlet of the expansion valve, so that signal data of the air conditioning system are collected through a detection mechanism arranged on the detection high-voltage tube 3 and the detection low-voltage tube 4, a detection and analysis result of refrigerant flowing sound is obtained based on the signal data, and the purpose of auxiliary analysis of the refrigerant flowing sound of the air conditioning system is achieved. Specifically, vibration signals, refrigerant pressure, temperature distribution of refrigerants in all directions of the pipe wall and the like at the expansion valve can be synchronously acquired and detected through the detection mechanism, so that vibration parameters and refrigerant thermodynamic parameters in refrigerant flowing sound test are subjected to linkage test analysis, and the accuracy of refrigerant flowing sound detection is greatly improved.

The present invention also provides a method for detecting refrigerant flow noise, as shown in fig. 4, including:

s10: receiving signal data collected by a detection mechanism; the signal data includes pressure data and temperature data, or vibration data.

The refrigerant flowing sound detection method can be applied to a data collector of a detection mechanism, and is convenient for analyzing the refrigerant flowing sound in the air conditioning system according to signal data output by the pressure sensor assembly, the temperature sensor assembly and the vibration sensor.

In addition, in the present embodiment, the refrigerant flow sound in the air conditioning system in the vehicle is detected under the idle condition. By way of example, testing may be performed in the following test environment:

it should be noted that the above test environment examples are only for illustration and do not limit the present invention.

Specifically, the installed refrigerant flow sound detection device operates in the test environment, and signal data are acquired, so that the data acquisition unit receives the signal data acquired by the detection mechanism in the refrigerant flow sound detection device, and the signal data include pressure data and temperature data, or vibration data.

S20: performing data analysis on the pressure data and the temperature data to obtain a detection and analysis result of the flowing sound of the refrigerant; or carrying out data analysis on the vibration data to obtain a detection and analysis result of the refrigerant flowing sound.

As an example, the data acquisition unit may perform data analysis on the pressure data and the temperature data to analyze the supercooling degree and/or the superheat degree of the inlet of the expansion valve, determine the occurrence reason of the refrigerant flow sound, and obtain the detection and analysis result of the refrigerant flow sound, so as to assist a tester to analyze the refrigerant flow sound and take a processing measure in time.

As an example, the data acquisition unit may perform data analysis on the vibration data, so as to determine whether the refrigerant flow sound exists and the sound type thereof according to the vibration at the expansion valve, and obtain a detection analysis result of the refrigerant flow sound, thereby assisting a tester in analyzing the refrigerant flow sound and taking a processing measure in time.

It should be noted that the data acquisition unit may perform data analysis on the vibration data to obtain a detection analysis result of the refrigerant flow sound; the pressure data and the temperature data can also be subjected to data analysis to obtain a detection and analysis result of the flowing sound of the refrigerant; or the two are linked, namely, the vibration data is subjected to data analysis, the acoustic parameters are extracted, and the existence of refrigerant flowing sound and the sound type of the refrigerant flowing sound are judged according to the acoustic parameters; and then analyzing the supercooling degree and/or the superheat degree of the inlet of the expansion valve according to the pressure data and the temperature data, judging the occurrence reason of the refrigerant flow sound, and acquiring a detection and analysis result of the refrigerant flow sound, wherein the detection and analysis result is not limited in the specification.

In the implementation, the refrigerant thermodynamic parameters and the acoustic parameters of the vibration data at the expansion valve are integrated, so that the refrigerant thermodynamic parameters and the acoustic parameters are comprehensively analyzed, the existence, the sound type, the flow condition and the occurrence reason of refrigerant flowing sound are accurately analyzed, a tester is assisted to test, and the test efficiency is improved.

In an embodiment, as shown in fig. 5, step S20 specifically includes the following steps:

s211: and dividing the signal bandwidth corresponding to the vibration data according to a preset bandwidth segment to obtain at least one bandwidth segment.

Specifically, when processing vibration data, the vibration data may correspond to a signal bandwidth (e.g., 10000Hz) and a frequency resolution (e.g., 1 Hz). Where frequency resolution is used to describe the ability of a digital signal processing system to distinguish between two frequency components that are closest together. The preset bandwidth segment is a preset frequency band segment used for dividing the vibration data, for example, two frequency band segments of 2000Hz to 4000Hz and 5000Hz to 7000 Hz. It is understood that the predetermined band segments may be selected to simulate human hearing range, and are not limited herein. In this embodiment, two frequency band segments of 2000Hz to 4000Hz and 5000Hz to 7000Hz are used as the preset frequency band segments, that is, the parts with concentrated noise energy are collected, so that the effectiveness of the vibration data involved in the calculation can be ensured while the data processing amount is reduced.

In this embodiment, the signal data is divided according to the preset bandwidth segment to obtain at least one bandwidth segment, so as to remove the vibration data of other frequency bands except the preset bandwidth segment, and reduce the data processing amount, so that the subsequent calculation is performed based on the vibration data in the bandwidth segment, and the acoustic parameters are extracted.

S212: and calculating the vibration data in the frequency band segments to obtain the acoustic parameters corresponding to each frequency band segment.

The acoustic parameters include, but are not limited to, the total value and loudness of the vibration data corresponding to the band segment. Specifically, the total value and loudness of the vibration data corresponding to each frequency band can be calculated by adopting an acoustic parameter processing algorithm so as to perform subsequent analysis.

S213: and analyzing based on the acoustic parameters to obtain the detection and analysis result of the flowing sound of the refrigerant.

In this embodiment, the analysis is performed based on the acoustic parameters to obtain the detection and analysis result of the flowing sound of the refrigerant, that is, whether the flowing sound of the refrigerant exists and the sound type thereof can be determined by analyzing the acoustic parameters according to the preset total threshold and the preset loudness threshold.

As an example, the acoustic parameters obtained in step S212 include a total value and loudness of vibration data corresponding to a frequency band, where the frequency band includes a first frequency band and a second frequency band, the vibration data corresponding to the first frequency band is a first total value and a first loudness, and the vibration data corresponding to the second frequency band is a second total value and a second loudness; a target loudness is determined based on the first loudness and the second loudness. In this example, the target loudness is the first loudness for subsequent analysis. It is to be understood that the target loudness may select the loudness of the vibration data corresponding to a certain frequency band segment as the target loudness for analysis according to actual needs, and is not limited herein.

Exemplarily, assuming that the frequency bands obtained in step S212 are 2000Hz to 4000Hz and 5000Hz to 7000Hz, the total value of the vibration data corresponding to the frequency band of 2000Hz to 4000Hz is a first total value, the total value of the vibration data corresponding to the frequency band of 5000Hz to 7000Hz is a second total value, the loudness of the vibration data corresponding to the frequency band of 2000Hz to 4000Hz is a target loudness, and the preset total value threshold includes a first preset total value threshold of 0.3m/S2, a second preset total value threshold of 0.22m/S2, and a preset loudness threshold of 13. The first preset total value threshold is used for judging the first total value, the second preset total value threshold is used for judging the second total value, and the preset loudness threshold is used for judging the target loudness.

The specific judging steps are as follows:

s2131: the target loudness is compared to a preset loudness threshold.

S2132: if the target loudness is greater than the preset loudness threshold (e.g., 13), the cold detection analysis result that the refrigerant flowing sound exists and the sound type is the boiling sound is obtained.

S2133: if the target loudness is not greater than the preset loudness threshold, judging whether the second total value is greater than a second preset total value threshold (namely 0.22m/s 2); and if the second total value is greater than a second preset total value threshold value, obtaining a detection and analysis result of the refrigerant flowing sound which exists at the moment and the sound type of which is high-frequency jet sound.

S2134: if the second total value is not greater than the second preset total value threshold, judging whether the first total value is greater than the first preset total value threshold; if the first total value is greater than a first preset total value threshold (i.e. 0.3m/s2), a detection analysis result that the refrigerant flowing sound exists at the moment and the sound type of the refrigerant flowing sound is low-frequency flowing water sound is obtained.

S2135: and if the first total value is not greater than the first preset total value threshold, obtaining a detection analysis result of the refrigerant flowing sound which does not exist at the moment.

In the embodiment, the acoustic parameters in the vibration data are extracted for detection, so that the existence and the sound type of the refrigerant flowing sound at the moment are judged in an auxiliary test, a tester can conveniently take control measures according to the refrigerant flowing sound, and the test efficiency is improved. Furthermore, on the basis of judging the existence of the sound, the reason of the sound generation can be analyzed through the pressure data and the temperature data so as to take corresponding control measures.

In an embodiment, as shown in fig. 6, step S20 specifically includes the following steps:

s221: and acquiring the saturation temperature of the refrigerant corresponding to the pressure data according to the pressure data.

S222: and analyzing the supercooling degree and/or the superheat degree of the inlet of the expansion valve based on the temperature data and the saturation temperature of the refrigerant to obtain a detection and analysis result of the flowing sound of the refrigerant.

The pressure data comprises high pressure data collected by a high pressure sensor and low pressure data collected by a low pressure sensor.

In this embodiment, the analyzing the supercooling degree and/or the superheat degree of the inlet of the expansion valve based on the temperature data and the saturation temperature of the refrigerant to obtain the detection and analysis result of the refrigerant flow sound specifically includes: analyzing the supercooling degree of the inlet of the expansion valve based on the temperature data and the saturation temperature of the refrigerant to obtain a detection and analysis result of the flowing sound of the refrigerant; and/or analyzing the superheat degree of the inlet of the expansion valve to obtain a detection and analysis result of the flowing sound of the refrigerant.

The method comprises the following steps of analyzing the supercooling degree of an inlet of an expansion valve based on temperature data and the saturation temperature of a refrigerant, and obtaining a detection and analysis result of refrigerant flowing sound, wherein the detection and analysis result comprises the following steps:

s301: and inquiring a refrigerant saturation vapor pressure comparison table according to the high-pressure data acquired by the high-pressure sensor to obtain the refrigerant saturation temperature of the refrigerant adopted in the test under the high-pressure data.

S302: and taking the difference value between the saturation temperature of the refrigerant under the high-pressure data and the temperature data acquired by the temperature sensor corresponding to each point in the inner surface of the pipe wall of the detected high-pressure pipe as the supercooling degree of the inlet of the expansion valve corresponding to the point.

Specifically, the calculation process is expressed as X by formula_i＝Y-Z_iWherein X is_iShowing the degree of subcooling at the inlet of the expansion valve at point i; y represents a refrigerant saturation temperature corresponding to the high-pressure data; z_iAnd the temperature data which are acquired by the temperature sensor which is used for detecting the inner surface of the high-pressure pipe and corresponds to the point are represented.

S303: drawing an envelope curve according to the supercooling degree of the expansion valve inlet corresponding to each point in the inner surface of the pipe wall of the high-pressure pipe, and calculating the area of the area surrounded by the envelope curve.

Specifically, the area of the region can be obtained by performing an integration operation on the region surrounded by the envelope.

S304: taking the quotient of the area and the test time as the average temperature difference of the supercooling degree of the high-pressure pipe; and carrying out average value calculation on the supercooling degree of the inlet of the expansion valve corresponding to each point to obtain the average supercooling degree.

Specifically, the quotient of the area of the region divided by the test time is taken as the average temperature difference for detecting the supercooling degree of the high-pressure pipe. And summing the supercooling degrees of the inlets of the expansion valves corresponding to the N points, and calculating the average value to obtain the average supercooling degree. Wherein N is the number of temperature sensors included in the high-pressure temperature sensing array.

S305: and judging according to the average temperature difference and the average supercooling degree to obtain a detection and analysis result of the flowing sound of the refrigerant.

Specifically, the judging steps are as follows:

(1) if the average supercooling degree is larger than the upper limit (for example, 20 ℃) of the preset supercooling degree range and the average temperature difference is larger than the preset temperature difference threshold (for example, 10 ℃), indicating that the refrigerant flows in a foam shape at the moment, wherein the generation reason of the flowing sound of the refrigerant is as follows: the foam and the liquid refrigerant impact the expansion valve at the same time, so that the opening of the expansion valve is unstable and hoarse refrigerant flowing sound is generated.

(2) If the average supercooling degree is in a preset supercooling degree range (such as 10-20 ℃) and the average temperature difference is larger than a preset temperature difference threshold value, indicating that larger bubbles appear in the refrigerant flow, wherein the generation reason of the refrigerant flow sound is as follows: the large bubbles form foam-broken boiling water sound when meeting the expansion valve or the sudden change of the shape in the refrigerant pipeline.

It is understood that if the average subcooling degree is within the predetermined subcooling degree range (e.g., 10 ℃ -20 ℃) and the average temperature difference is not greater than the predetermined temperature difference threshold, no indication is given.

(3) If the evaluation supercooling degree is smaller than the lower limit (such as 10 ℃) of the preset supercooling degree range and the average temperature difference is larger than the preset temperature difference threshold value, indicating that the layered flow phenomenon of the refrigerant occurs, wherein the flow sound of the refrigerant is caused by: the lower layer liquid refrigerant forms waves to impact the expansion valve to emit water flowing sound.

(4) And if the average supercooling degree is larger than the lower limit of the preset supercooling degree range and the average temperature difference is not larger than the preset temperature difference threshold value, prompting that the flowing sound of the refrigerant does not occur.

(5) If the average supercooling degree is smaller than the lower limit of the preset supercooling degree range and the average temperature difference is not larger than the preset temperature difference threshold value, the supercooling degree of the refrigerant is insufficient, small bubbles exist in the liquid pipeline, and the flowing sound of the refrigerant is generated because the bubbles impact the expansion valve to generate hoarse sound.

The method comprises the following steps of analyzing the superheat degree of an inlet of an expansion valve based on temperature data and the saturation temperature of a refrigerant, and obtaining a detection analysis result of refrigerant flowing sound, wherein the detection analysis result comprises the following steps:

s401: inquiring a saturated vapor pressure comparison table of the refrigerant according to low-pressure data acquired by the low-pressure sensor to obtain the refrigerant saturation temperature of the refrigerant adopted in the test under the low-pressure data;

s402: taking the difference value of the refrigerant saturation temperature under the low-pressure data and the temperature data acquired by the temperature sensor corresponding to each point in the inner surface of the pipe wall of the low-pressure pipe as the superheat degree of the outlet of the expansion valve corresponding to the point;

specifically, the calculation process is expressed as P_i＝M-Q_iWherein P is_iIndicating the superheat degree of the outlet of the expansion valve at the ith point; m represents a refrigerant saturation temperature corresponding to the low pressure data; q_iAnd the temperature data which are acquired by the temperature sensor which is corresponding to the point and detects the inner surface of the low-pressure pipe are represented.

S403: and carrying out average calculation on the superheat degree of the outlet of the expansion valve corresponding to each point to obtain the average superheat degree.

Specifically, the superheat degree of the outlet of the expansion valve corresponding to the M point is summed and averaged, and the average supercooling degree can be obtained. Where M is the number of temperature sensors included in the low-voltage temperature sensing array.

S404: and analyzing according to the average superheat degree and a preset superheat degree threshold value to obtain a detection analysis result of the refrigerant flowing sound.

Specifically, the judging steps are as follows:

(1) if the average superheat degree is larger than a first preset superheat degree threshold value (for example, 5 ℃), the matching opening degree of the expansion valve is prompted to be too small, and the problem of refrigerant flowing sound is possibly caused.

(2) If the average superheat degree is smaller than a second preset superheat degree threshold value (0 ℃), the expansion valve is prompted to be too large in matching opening degree, and the problem of refrigerant flowing sound is possibly caused.

It will be appreciated that if the average superheat is between the first and second predetermined superheat thresholds, then no indication is made.

In this embodiment, the reason for the occurrence of the refrigerant flow sound is determined by analyzing the pressure data and the temperature data, so as to assist a tester in analyzing the refrigerant flow sound, and measures can be taken in time according to the prompted reason for the occurrence of the refrigerant flow sound.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.