Electric compressor, air conditioning system and vehicle

Abstract

The application discloses an electric compressor, an air conditioning system and a vehicle, and relates to the technical field of compressors. The electric compressor comprises a shell assembly and a compression mechanism. The shell assembly comprises a first shell and a support. The axial two ends of the first shell are respectively a first end and a second end. The support is arranged at the first end of the first shell, so that an accommodating cavity is formed between the support and the first shell. An oil separation cavity and a refrigerant discharge port are formed on the first shell. The oil separation cavity is arranged close to the second end relative to the first end. An oil separation outlet of the oil separation cavity is communicated with the refrigerant discharge port. The compression mechanism is arranged in the accommodating cavity. A first sound attenuation cavity is formed between the compression mechanism and the support. The compression mechanism has a first exhaust port. The first exhaust port is communicated with the first sound attenuation cavity. The first sound attenuation cavity is communicated with an oil separation inlet of the oil separation cavity. According to the electric compressor, the noise and vibration during operation can be improved, and the structure is compact and has good versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an electric compressor, an air-conditioning system and a vehicle. Background Art

[0002] Electric compressors are core components of vehicle refrigeration systems. Their operation generates vibration and noise, which impacts vehicle noise and can cause subjective auditory issues. In related technologies, high-pressure refrigerant discharged from the compressor's compression mechanism passes through an oil separator chamber for gas-liquid separation before leaving the compressor through the refrigerant outlet. The exhaust airflow noise and pressure pulsations generated by the electric compressor's operation can easily stimulate resonance in various components of the vehicle's thermal management system, leading to vehicle noise and vibration issues. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention is to provide an electric compressor that can reduce noise and vibration during operation.

[0004] The present invention further provides an air conditioning system having the electric compressor.

[0005] The present invention also provides a vehicle having the above air conditioning system.

[0006] According to the first aspect of the present invention, the electric compressor includes: a shell assembly, the shell assembly includes a first shell and a bracket, the axial ends of the first shell are respectively a first end and a second end, the bracket is arranged at the first end of the first shell, so that an accommodating chamber is formed between the bracket and the first shell, an oil separation chamber and a refrigerant discharge port are formed on the first shell, the oil separation chamber is arranged close to the second end relative to the first end, and the oil separation outlet of the oil separation chamber is connected to the refrigerant discharge port; a compression mechanism, the compression mechanism is arranged in the accommodating chamber, a first silencer chamber is formed between the compression mechanism and the bracket, the compression mechanism has a first exhaust port, the first exhaust port is connected to the first silencer chamber, and the first silencer chamber is connected to the oil separation inlet of the oil separation chamber.

[0007] According to the electric compressor of the present invention, the operating noise and vibration of the electric compressor can be reduced, the space utilization rate inside the electric compressor is high, and it is beneficial to reduce the volume of the electric compressor.

[0008] In some embodiments, the second end of the first shell is closed, and the oil separation chamber is formed in the end shell of the second end.

[0009] In some embodiments, a first communication channel is formed in the side shell of the first housing, and the first communication channel connects the first muffler chamber and the oil separation inlet of the oil separation chamber.

[0010] Furthermore, a first communicating hole is provided at the connection between the first shell and the bracket, the first communicating channel and the first muffler chamber are communicated through the first communicating hole, and a flow area of ​​the first communicating hole is smaller than a flow area of ​​the first communicating channel.

[0011] Specifically, the first communicating hole is formed on the bracket, or formed on the first shell, or is defined by an inserting tube inserted into the first shell or the bracket.

[0012] Preferably, the minimum flow area of ​​the first communicating hole is S1, and the volume of the first muffler cavity is V1, wherein 0.06≤S1 / V1≤2.0.

[0013] In some embodiments, the compression mechanism has a second silencer chamber therein, and the second silencer chamber is connected to the first silencer chamber.

[0014] Furthermore, the second muffler chamber and the first muffler chamber are spaced apart from each other along the axial direction of the compression mechanism, and a second communicating channel is formed on the compression mechanism, and the second communicating channel connects the second muffler chamber and the first muffler chamber.

[0015] Preferably, the minimum flow area of ​​the second communicating channel is S2, and the volume of the second muffler cavity is V2, wherein 0.08≤S2 / V2≤2.2.

[0016] In some embodiments, a high-pressure chamber is formed between the chamber wall of the accommodating chamber and the compression mechanism, and the high-pressure chamber is connected to the first muffler chamber and the oil separator inlet of the oil separator chamber.

[0017] Furthermore, the compression mechanism has a second silencer chamber in it, the second silencer chamber is connected to the first silencer chamber, and the compression mechanism has a second communicating hole, the second communicating hole is connected to the second silencer chamber and the high-pressure chamber.

[0018] In some specific embodiments, the compression mechanism is a rotary compression mechanism or a scroll compression mechanism.

[0019] An air conditioning system according to a second aspect of the present invention includes the electric compressor according to any one embodiment of the first aspect of the present invention.

[0020] According to the air conditioning system of the present invention, by providing the electric compressor of the first aspect, exhaust noise and vibration of the electric compressor can be reduced, thereby reducing the operating noise and vibration of the entire air conditioning system.

[0021] A vehicle according to a third aspect of the present invention includes a vehicle body and an air conditioning system mounted on the vehicle body, wherein the air conditioning system is the air conditioning system according to the second aspect of the present invention.

[0022] According to the vehicle of the present invention, by setting the air-conditioning system of the second aspect mentioned above, the resonance problem of various components in the vehicle thermal management system caused by the exhaust airflow noise and pressure pulsation of the electric compressor can be improved, thereby improving the noise and vibration caused to the vehicle.

[0023] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0025] Figure 1 is a perspective view of a first housing of an electric compressor according to a first embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A cross-sectional view of the electric compressor shown in ;

[0027] Figure 3 yes Figure 1 A sectional view of the shaft of the electric compressor shown in ;

[0028] Figure 4 is a cross-sectional view of an electric compressor according to a second embodiment of the present invention;

[0029] Figure 5 is a cross-sectional view of a motor-driven compressor according to a third embodiment of the present invention;

[0030] Figure 6 is a cross-sectional view of a motor-driven compressor according to a fourth embodiment of the present invention;

[0031] Figure 7 is a cross-sectional view of a motor-driven compressor according to a fifth embodiment of the present invention;

[0032] Figure 8 is a schematic diagram of a vehicle according to an embodiment of the present invention;

[0033] Figure 9 is a graph showing the relationship between S2 / V2 and the pressure pulsation amplitude according to the first embodiment of the present invention.

[0034] Reference numerals:

[0035] Electric compressor 100,

[0036] Shell assembly 1,

[0037] Accommodating chamber 10, first muffler chamber 101, high pressure chamber 102,

[0038] The first housing 11,

[0039] The first end 111, the second end 112,

[0040] Oil separation chamber 113, oil separation outlet 1131, oil separation inlet 1132, exhaust pipe 1133,

[0041] Refrigerant outlet 114,

[0042] The first communication channel 115,

[0043] Bracket 12,

[0044] Gasket 13,

[0045] Compression mechanism 2, first exhaust port 21, second muffler chamber 22, second communication channel 23, second communication hole 24, first cylinder 251, second cylinder 252, first piston 261, second piston 262, partition 27, first bearing 281, second bearing 282, second exhaust port 283, muffler 29,

[0046] First communicating hole 3, driving shaft 4,

[0047] Air conditioning system 200,

[0048] Vehicle 300. DETAILED DESCRIPTION

[0049] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0050] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will appreciate the applicability of other processes and / or the use of other materials.

[0051] Hereinafter, a motor-driven compressor 100 , an air-conditioning system 200 , and a vehicle 300 according to embodiments of the present invention will be described with reference to the accompanying drawings.

[0052] like Figure 1-Figure 3 As shown, the electric compressor 100 according to an embodiment of the present invention includes: a housing assembly 1 and a compression mechanism 2, and the compression mechanism 2 is used to compress low-pressure refrigerant into high-pressure refrigerant.

[0053] The shell assembly 1 includes a first shell 11 and a bracket 12. The axial ends of the first shell 11 are respectively a first end 111 and a second end 112. The bracket 12 is arranged at the first end 111 of the first shell 11 so that an accommodating cavity 10 is formed between the bracket 12 and the first shell 11. An oil separation cavity 113 and a refrigerant discharge port 114 are formed on the first shell 11, that is, the oil separation cavity 113 and the refrigerant discharge port 114 are both integrally formed structures on the first shell 11.

[0054] The compression mechanism 2 is disposed within the accommodating chamber 10. A first muffler chamber 101 is formed between the compression mechanism 2 and the bracket 12. The compression mechanism 2 has a first exhaust port 21, which communicates with the first muffler chamber 101. The first muffler chamber 101 communicates with an oil separation inlet 1132 of an oil separation chamber 113. An oil separation outlet 1131 of the oil separation chamber 113 communicates with a refrigerant discharge port 114. The oil separation chamber 113 is used to separate gas from liquid in the high-pressure refrigerant, allowing the gas to be discharged from the refrigerant discharge port 114.

[0055] For example, when the electric compressor 100 is powered on and operates normally, it can inhale low-pressure refrigerant. The low-pressure refrigerant is compressed by the compression mechanism 2 to form high-pressure refrigerant, and is discharged into the first muffler chamber 101 through the first exhaust port 21 of the compression mechanism 2. The high-pressure refrigerant in the first muffler chamber 101 enters the oil separator chamber 113 through the oil separator inlet 1132 to realize gas-liquid separation, and the separated gaseous refrigerant is finally discharged to the outside of the shell assembly 1 through the refrigerant discharge port 114.

[0056] The oil separation chamber 113 is positioned closer to the second end 112 relative to the first end 111. That is, the axial distance between the oil separation chamber 113 and the second end 112 is smaller than the axial distance between the oil separation chamber 113 and the first end 111. Since the first muffler chamber 101 is formed by the compression mechanism 2 and the bracket 12, and the bracket 12 is located at the first end 111 of the first housing 11, the first muffler chamber 101 is closer to the first end 111 relative to the second end 112. That is, the axial distance between the first muffler chamber 101 and the first end 111 is smaller than the axial distance between the first muffler chamber 101 and the second end 112. Thus, the first muffler chamber 101 and the oil separation chamber 113 on the first housing 11 are separated by a certain axial distance. It should be noted that the axial direction of the first housing 11 is the same as the axial direction of the compression mechanism 2.

[0057] In the electric compressor 100 of the embodiment of the present invention, the oil separation chamber 113 is spaced a certain distance from the first muffler chamber 101. This increases the distance that high-pressure refrigerant flows from the first muffler chamber 101 to the oil separation chamber 113, thereby reducing the flow noise and pressure pulsation of the high-pressure refrigerant, and thus reducing the operating noise and vibration of the electric compressor 100. Furthermore, the first muffler chamber 101 is formed between the compression mechanism 2 and the bracket 12, eliminating the need for additional muffler components outside the first housing 11 or bracket 12. This reduces the cost of installing muffler components and eliminates the installation process of muffler components to the first housing 11 or bracket 12, thereby improving production efficiency. Furthermore, the overall structure of the electric compressor 100 is more compact, which helps reduce the volume and space occupied by the electric compressor 100 and enhances its versatility. Furthermore, locating the compression mechanism 2 within the accommodating chamber 10 further enhances the compactness of the electric compressor 100, achieving more efficient utilization of the space within the electric compressor 100 within the limited volume of the electric compressor 100 and further reducing the volume and space occupied by the electric compressor 100.

[0058] Specifically, as a core component of vehicle refrigeration systems, the size and weight of electric compressors are strictly controlled to ensure optimal vehicle range and other key performance characteristics. Within these constraints, the internal volume of the compressor is very limited. After ensuring space for the compression and motor components, the cavity volume available for refrigerant buffering and noise reduction is even smaller. The exhaust solution proposed in this invention provides an effective solution for utilizing limited volume to enhance noise reduction.

[0059] In some embodiments, as Figure 1-Figure 3 As shown, the second end 112 of the first housing 11 is closed, and the oil separation chamber 113 is formed in the end shell of the second end 112. In this structure, the oil separation chamber 113 and the first muffler chamber 101 are respectively located at the second end 112 and the first end 111 of the first housing 11. The distance between the two is large, which increases the flow distance of the high-pressure refrigerant from the first muffler chamber 101 to the oil separation chamber 113, thereby better reducing the flow noise and pressure pulsation of the high-pressure refrigerant, thereby further reducing the operating noise and vibration of the electric compressor 100.

[0060] Furthermore, configuring the second end 112 of the first housing 11 as a closed structure simplifies the structure of the housing assembly 1 and eliminates the cost and process of using additional components to seal the second end 112. Furthermore, forming the oil separation chamber 113 within the end shell of the second end 112 prevents the oil separation chamber 113 from excessively occupying the space of the accommodating chamber 10, ensuring sufficient capacity for the accommodating chamber 10. This also alleviates issues such as interference between the oil separation chamber 113 and the compression mechanism 2 within the accommodating chamber 10, thereby improving general performance.

[0061] In some embodiments, as Figure 1 、 Figure 3 As shown, a first connecting channel 115 is formed within the side shell of the first housing 11. The first connecting channel 115 connects the first muffler chamber 101 with the oil separator inlet 1132 of the oil separator chamber 113. As a result, the high-pressure refrigerant within the first muffler chamber 101 flows into the first connecting channel 115 and then flows into the oil separator chamber 113 through the oil separator inlet 1132. This improves exhaust efficiency and, when an oil pool is present within the accommodating chamber 10, prevents the first muffler chamber 101 from exhausting into the accommodating chamber 10, thereby preventing other adverse effects caused by an unstable oil pool level. Furthermore, with this structure, the first connecting channel 115 is formed within the side shell of the first housing 11, preventing it from occupying space within the accommodating chamber 10. Furthermore, the structural strength of the first connecting channel 115 is enhanced, making it less likely to deform under the pressure of the high-pressure refrigerant, thereby improving the reliability of the electric compressor 100.

[0062] The method for forming the first communication channel 115 on the first housing 11 is not limited. For example, the first communication channel 115 can be directly formed during casting or injection molding of the first housing 11. In another example, the first communication channel 115 can be formed by punching a hole in the first housing 11. In addition, it should be noted that the first communication channel 115 can extend along a straight line or a curve, and the specific extension method is not limited.

[0063] In the present invention, there is no limitation on the number of first communicating channels 115. The first communicating channel 115 may be one or multiple channels independently connecting the first muffler chamber 101 and the oil separation chamber 113. It should be noted that when there are multiple first communicating channels 115, the sum of the flow areas of all first communicating channels 115 may be set to be the same as the flow area when there is only one first communicating channel 115.

[0064] In some embodiments, as Figure 4 、 Figure 5As shown, a first connecting hole 3 is provided at the connection between the first housing 11 and the bracket 12. The first connecting channel 115 communicates with the first muffler chamber 101 through the first connecting hole 3. The flow area of ​​the first connecting hole 3 is smaller than the flow area of ​​the first connecting channel 115. Therefore, since the flow area of ​​the refrigerant path from the first muffler chamber 101 to the oil separation chamber 113 is not constant, the first connecting channel 115 with a relatively large flow area can be used to ensure exhaust efficiency. At the same time, the first connecting hole 3 with a relatively small flow area can be used to design the relevant dimensional proportions to improve the noise reduction effect. In addition, as the high-pressure refrigerant in the first muffler chamber 101 flows into the first connecting channel 115 through the first connecting hole 3, the flow area first decreases and then increases. This further helps to reduce the flow noise and pressure pulsation of the high-pressure refrigerant in the first housing 11, further reducing the operating noise and vibration of the electric compressor 100.

[0065] It should be noted that those skilled in the art can match and calculate the specific dimensions that the flow areas of the first connecting hole 3 and the first connecting channel 115 need to meet respectively according to the specific requirements of different working conditions. Therefore, the present invention does not limit the specific dimensions.

[0066] In the present invention, the location and shape of the first communication hole 3 are not limited. For example, the first communication hole 3 can be formed on the bracket 12, or on the first housing 11, or defined by a cannula inserted into the first housing 11 or the bracket 12. Thus, the location of the first communication hole 3 is relatively flexible and can be located on the bracket 12 or the first housing 11 according to the structural requirements of the device, or it can be provided as a separate structure.

[0067] For example, in Figure 4 In the example, the first communication hole 3 is formed on the bracket 12, and a passage with a flow area smaller than the flow area of ​​the first communication channel 115 is formed at the connection between the bracket 12 and the first communication channel 115, and this passage constitutes the first communication hole 3. For another example, Figure 5 In the example, the first communication hole 3 is formed on the first housing 11. In this case, the first communication hole 3 can be configured as a passage between the first communication channel 115 and the first muffler chamber 101, and the flow area of ​​the first communication hole 3 is smaller than the flow area of ​​the first communication channel 115. For another example, a gasket 13 is further provided between the first housing 11 and the bracket 12. In this case, the first communication hole 3 can be a cannula provided on the gasket 13 and corresponding to the first communication channel 115. The cannula can be inserted into the first communication channel 115, or inserted into the first muffler chamber 101, or inserted into both the first communication channel 115 and the first muffler chamber 101.

[0068] Preferably, the minimum flow area of ​​the first communicating hole 3 is S1, and the volume of the first muffler cavity 101 is V1, wherein 0.06≤S1 / V1≤2.0, for example, 0.06, 0.1, 0.5, 1, 1.5, 1.9, 2.0, etc. In such a structure, the noise reduction effect is better.

[0069] It should be noted that when there are multiple first communication channels 115 , the number of first communication holes 3 can be the same as that of the first communication channels 115 , which is also multiple. In this case, the total flow area of ​​the multiple first communication holes 3 is S1 .

[0070] In some embodiments, as Figure 3 As shown, the compression mechanism 2 may further include a second silencer chamber 22, which is in communication with the first silencer chamber 101. Thus, the high-pressure refrigerant compressed by the compression mechanism 2 is discharged into the first silencer chamber 101 and the second silencer chamber 22. By providing the second silencer chamber 22 in communication with the first silencer chamber 101, the total volume of the silencer chambers in the electric compressor 100 can be increased. After being discharged into the first silencer chamber 101 and the second silencer chamber 22, the high-pressure refrigerant is accommodated in a larger space, which reduces the pressure of the high-pressure refrigerant and reduces the pressure on the inner walls of the first silencer chamber 101 and the second silencer chamber 22, thereby reducing the flow noise and pressure pulsation caused by the high-pressure refrigerant.

[0071] In addition, a second silencer chamber 22 is provided in the compression mechanism 2, eliminating the need for additional silencer components in the accommodating chamber 10, thereby improving the space utilization rate in the accommodating chamber 10 and achieving better noise reduction and vibration reduction effects while making the electric compressor 100 compact.

[0072] For example Figure 3 As shown, the second muffler chamber 22 and the first muffler chamber 101 are spaced apart from each other along the axial direction of the compression mechanism 2, and a second connecting channel 23 is formed on the compression mechanism 2, which connects the second muffler chamber 22 with the first muffler chamber 101. As a result, the high-pressure refrigerant compressed by the compression mechanism 2 is discharged into the first muffler chamber 101 and then enters the second muffler chamber 22 along the second connecting channel 23. The high-pressure refrigerant entering the second muffler chamber 22 can then flow back into the first muffler chamber 101 through the second connecting channel 23. Subsequently, the high-pressure refrigerant in the first muffler chamber 101 enters the oil separator chamber 113 through the oil separator inlet 1132, and the separated gaseous refrigerant is finally discharged to the outside of the shell assembly 1 through the refrigerant discharge port 114.

[0073] Under such a structure, since the second silencer chamber 22 and the first silencer chamber 101 are arranged at an axial interval along the compression mechanism 2, there is a certain axial distance between the second silencer chamber 22 and the first silencer chamber 101, so the high-pressure refrigerant has a certain flow distance in the second connecting channel 23, thereby better reducing the flow noise and pressure pulsation of the high-pressure refrigerant, and reducing the working noise and vibration of the electric compressor 100.

[0074] Of course, the present invention is not limited thereto. For example, in other embodiments of the present invention, for example, Figure 7 The compression mechanism 2 may also be provided with a second exhaust port 283, which may exhaust directly to the second muffler chamber 22, thereby improving the exhaust efficiency.

[0075] It can be understood that the flow space of the high-pressure refrigerant in the first silencer chamber 101 and the second silencer chamber 22 is larger than the flow area of ​​the second connecting channel 23. Therefore, in the process of the high-pressure refrigerant flowing from the second silencer chamber 22 through the second connecting channel 23 to the first silencer chamber 101, the flow noise and pressure pulsation of the high-pressure refrigerant in the first shell 11 can be further reduced, and the working noise and vibration of the electric compressor 100 can be further reduced.

[0076] In the present invention, there is no limitation on the number of second communicating channels 23. The second communicating channel 23 may be one or multiple channels that independently connect the first muffler chamber 101 and the second muffler chamber 22. It should be noted that when there are multiple second communicating channels 23, the sum of the flow areas of all the second communicating channels 23 is the same as the flow area when there is only one second communicating channel 23.

[0077] Preferably, if Figure 9 As shown, the minimum flow area of ​​the second communication channel 23 is S2, and the volume of the second muffler chamber 22 is V2, wherein 0.08≤S2 / V2≤2.2, for example, 0.08, 0.1, 0.5, 1, 1.5, 1.9, 2.2, etc. In this structure, both exhaust efficiency and noise reduction effect can be taken into account.

[0078] It should be noted that, when a plurality of second communication channels 23 are provided, the total flow area of ​​the plurality of second communication channels 23 is S2.

[0079] Through analysis and testing, we found that traditional designs generally consider pressure loss and design the compressor's exhaust-side cavity and flow passages as large cavities and large flow areas. However, this design is not optimal for refrigerant pulsation attenuation and noise reduction. Regarding the operating conditions and common noise issues of electric compressors, if specific noise frequency bands are encountered, such as difficult-to-solve low-frequency noise, the inherent flow passage topology of the compressor can be used to control the "cavity-tube-cavity-tube" distribution ratio and optimize the flow passage area to cavity volume ratio to achieve improvements in compressor noise issues, especially low-frequency noise.

[0080] The applicant discovered that the attenuation characteristics of fluid pulsation differ significantly from those of acoustic pulsation, and that the acoustic plane wave propagation formula alone cannot achieve optimal fluid pulsation attenuation. Simulation combined with experimental testing can determine the optimal ratio range for the flow area of ​​each flow channel and the volume of the buffer chamber.

[0081] When the electric compressor 100 is used in the vehicle 300, the operating state of the electric compressor 100 is affected by the working condition of the vehicle 300. Since the attenuation characteristics of fluid pulsation are significantly different from the attenuation characteristics of acoustic pulsation, through simulation combined with experimental testing, it is obtained that Figure 9 The data shown is from Figure 9 It can be seen that when the vehicle is in idling condition, the amplitude of pressure pulsation is small within the range of 0.08≤S2 / V2≤0.8, and the attenuation and noise reduction effects of fluid pulsation are optimal. When the vehicle is in low-speed cooling condition, the amplitude of pressure pulsation is small within the range of 0.4≤S2 / V2≤2.2, and the attenuation and noise reduction effects of fluid pulsation are optimal. When the vehicle is in dehumidification condition, it is preferably between the above two ranges, so that within the range of 0.08≤S2 / V2≤2.2, it has a better effect of reducing pressure pulsation and noise.

[0082] In some embodiments, as Figure 6 、 Figure 7 As shown, a high-pressure chamber 102 is formed between the cavity wall of the accommodating chamber 10 and the compression mechanism 2. The high-pressure chamber 102 connects the first muffler chamber 101 and the oil separator inlet 1132 of the oil separator chamber 113. As a result, the high-pressure refrigerant in the first muffler chamber 101 flows into the high-pressure chamber 102 and then flows into the oil separator chamber 113 through the oil separator inlet 1132. In this structure, the high-pressure chamber 102 is formed by the cavity wall of the accommodating chamber 10 and the compression mechanism 2. There is no need to provide additional structures such as a connecting conduit between the oil separator inlet 1132 and the first muffler chamber 101 in the first housing 11. This simplifies the structure of the electric compressor 100 and eliminates the need to machine a connecting passage connecting the oil separator inlet 1132 and the first muffler chamber 101 on the first housing 11. This reduces the difficulty of machining the first housing 11, reduces the investment cost of providing the connecting structure, and improves production efficiency.

[0083] It is understood that the high-pressure chamber 102 has a certain amount of space, which can reduce the pressure of the high-pressure refrigerant flowing in the high-pressure chamber 102, thereby reducing the pressure pulsation generated by the high-pressure refrigerant. At the same time, the flow space of the high-pressure refrigerant in the first muffler chamber 101 and the high-pressure chamber 102 can be smaller than the flow space of the high-pressure chamber 102, thereby reducing the flow noise and pressure pulsation of the high-pressure refrigerant in the first housing 11, further reducing the operating noise and vibration of the electric compressor 100.

[0084] Further, combined with Figure 7 The compression mechanism 2 has a second silencer chamber 22, which is connected to the first silencer chamber 101. The compression mechanism 2 has a second connecting hole 24, which connects the second silencer chamber 22 and the high-pressure chamber 102. As a result, the high-pressure refrigerant formed by the compression mechanism 2 is discharged into the first silencer chamber 101, and then can enter the second silencer chamber 22. The high-pressure refrigerant in the first silencer chamber 101 can flow directly into the high-pressure chamber 102, and the high-pressure refrigerant in the second silencer chamber 22 flows into the high-pressure chamber 102 through the second connecting hole 24. The high-pressure refrigerant in the high-pressure chamber 102 flows into the oil separator chamber 113 through the oil separator inlet 1132. In this process, the high-pressure refrigerant can improve the exhaust efficiency while ensuring the noise reduction effect when flowing from the second silencer chamber 22 to the high-pressure chamber 102 through the second connecting hole 24.

[0085] Alternatively, for example, reference Figure 7 The compression mechanism 2 may also be provided with a second exhaust port 283, which can exhaust directly into the second muffler chamber 22, thereby further improving the exhaust efficiency. In addition, the first muffler chamber 101 is connected to the second muffler chamber 22, so that the high-pressure refrigerant can flow between the first muffler chamber 101 and the second muffler chamber 22. As a result, the high-pressure refrigerant pressure in the first muffler chamber 101 and the second muffler chamber 22 is relatively balanced, which can avoid the pressure difference between the first muffler chamber 101 and the second muffler chamber 22 causing the electric compressor 100 to vibrate.

[0086] In the present invention, the number and shape of the second communicating holes 24 are not limited. The number of the second communicating holes 24 can be one or multiple second communicating holes 24 that independently connect the second muffler chamber 22 and the high-pressure chamber 102 .

[0087] Optionally, the lower portion of the oil separation chamber 113 has an oil return hole, and the accommodating chamber 10 may have an oil pool, the oil return hole being connected to the oil pool to facilitate oil return, and the oil pool can be used to provide lubricating oil to the compression mechanism 2. Thus, the structural compactness of the electric compressor 100 can be improved.

[0088] It should be noted that the gas-liquid separation principle of the oil separator chamber 113 is not limited. For example, the oil separator inlet 1132 can extend along the tangential direction of the oil separator chamber 113. The refrigerant entering the oil separator chamber 113 from the oil separator inlet 1132 can flow circumferentially, and the oil in the refrigerant is thrown out by centrifugal force. The gaseous refrigerant separated from the oil can be discharged through the oil separator outlet 1131, thereby achieving a better gas-liquid separation effect.

[0089] In this embodiment, an exhaust pipe 1133 can also be provided in the oil separation chamber 113. The refrigerant entering the oil separation chamber 113 can flow circumferentially around the outer periphery of the exhaust pipe 1133 to achieve a more reliable gas-liquid separation effect. The separated gaseous refrigerant enters the exhaust pipe 1133 and is then discharged from the oil separation outlet 1131 through the exhaust pipe 1133.

[0090] Of course, the present invention is not limited to this. For example, a filter structure such as a filter screen can also be set in the oil separation chamber 113 to filter out the oil in the refrigerant. The gaseous refrigerant separated from the oil can pass through the filter structure and be discharged through the oil separation outlet 1131, which will not be elaborated here.

[0091] In some specific embodiments, the type of the compression mechanism 2 is not limited, and can be, for example, a rotary compression mechanism or a scroll compression mechanism.

[0092] Thus, different types of compression mechanisms 2 can be used on different electric compressors 100. For example, when the electric compressor 100 is a rotary compressor, the compression mechanism 2 is a rotary compression mechanism, which may include a cylinder, a piston, a vane, etc., and the drive shaft 4 of the motor drives the piston to roll in the cylinder. When the electric compressor 100 is a scroll compressor, the compression mechanism 2 is a scroll compression mechanism, which may include a fixed scroll and an orbiting scroll, and the drive shaft drives the orbiting scroll to rotate, etc.

[0093] It should be noted that the specific type of the electric compressor 100 is not limited. For example, it can be a horizontal compressor with a central axis extending horizontally or slightly inclined to the horizontal line, or a vertical compressor with a central axis extending vertically or slightly inclined to the vertical line, etc.

[0094] It should be noted that when the compression mechanism 2 is a rotary compression mechanism, it can be a single-cylinder compression mechanism or a multi-cylinder compression mechanism. Figure 7 In the example shown, the compression mechanism 2 is a two-cylinder compression mechanism, including: a first bearing 281 , a second bearing 282 , a first cylinder 251 , a second cylinder 252 , a first piston 261 , a second piston 262 , a partition 27 and a muffler 29 .

[0095] The first cylinder 251 and the second cylinder 252 are arranged axially at intervals, and the first cylinder 251 is located on the side of the second cylinder 252 close to the bracket 12, the partition 27 is clamped between the first cylinder 251 and the second cylinder 252, the first bearing 281 is located on the side of the first cylinder 251 away from the partition 27, and the second bearing 282 is located on the side of the second cylinder 252 away from the partition 27.

[0096] A first compression chamber is formed between the first cylinder 251, the partition 27 and the first bearing 281. The first piston 261 is rotatably adapted to the first compression space. The first bearing 281 has a first exhaust port 21 connected to the exhaust chamber of the first compression space. A first silencer chamber 101 is formed between the first bearing 281 and the bracket 12. The first exhaust port 21 is connected to the first silencer chamber 101.

[0097] A second compression chamber is formed between the second cylinder 252, the partition 27 and the second bearing 282. The second piston 262 can be rolled to fit in the second compression space. The second bearing 282 has a second exhaust port 283 connected to the exhaust chamber of the second compression space. The muffler 29 is arranged on the side of the second bearing 282 away from the second cylinder 252. A second muffler chamber 22 is formed between the second bearing 282 and the muffler 29. The second exhaust port 283 is connected to the second muffler chamber 22. A second connecting hole 24 connecting the second muffler chamber 22 and the accommodating chamber 10 is formed on the muffler 29.

[0098] The second communication passage 23 passes through the first bearing 281, the first cylinder 251, the partition plate 27, the second cylinder 252 and the second bearing 282 to connect the first muffler chamber 101 and the second muffler chamber 22. Thus, the structure of the compression mechanism 2 is simple and compact.

[0099] The air conditioning system 200 according to an embodiment of the present invention includes the electric compressor 100 according to any of the above-described embodiments. Thus, by adopting the above-described electric compressor 100, the electric compressor 100 has a compact structure, which helps to reduce the volume of the air conditioning system 200. At the same time, it can reduce the exhaust noise and vibration of the electric compressor 100, thereby reducing the overall operating noise and vibration of the air conditioning system 200.

[0100] It should be noted that the specific application scenarios of the air-conditioning system 200 according to the embodiment of the present invention are not limited, such as indoor air conditioning, indoor refrigerators, vehicle air conditioning, etc. Once the application scenario is determined, those skilled in the art will be able to know the other components of the air-conditioning system 200. For example, when used for indoor air conditioning or indoor refrigerators, it may also include an evaporator, a condenser, a throttling element, etc. For example, when used for vehicle air conditioning, it may also include at least one of an in-vehicle condenser, an in-vehicle evaporator, an outdoor condenser, an outdoor evaporator, and a throttling component, etc., which will not be repeated here.

[0101] like Figure 8 As shown, a vehicle 300 according to an embodiment of the present invention includes: a vehicle body and an air conditioning system 200 mounted on the vehicle body. The air conditioning system 200 is any of the air conditioning system 200 described above. Because the exhaust noise and pressure pulsation of the electric compressor 100 included in the air conditioning system 200 described above can be improved, when the air conditioning system 200 is used in the vehicle 300, the resonance problem of various components in the thermal management system of the vehicle 300 caused by the exhaust airflow noise and pressure pulsation of the electric compressor 100 can be alleviated, thereby reducing the noise and vibration caused to the vehicle 300.

[0102] Furthermore, since the use of the electric compressor 100 can reduce the volume of the air conditioning system 200 , the installation location of the air conditioning system 200 in the vehicle 300 can be more flexible.

[0103] It should be noted that the specific type of vehicle 300 according to the embodiment of the present invention is not limited. For example, it can be a new energy vehicle, which can include pure electric vehicles, hybrid vehicles, etc., which are not described in detail here. In addition, once the type of vehicle 300 is specifically determined, those skilled in the art will be able to understand other components of vehicle 300, which are not described in detail here.

[0104] The electric compressor 100 according to some specific embodiments of the present invention is described below.

[0105] First embodiment

[0106] like Figure 1-Figure 3 As shown, the exemplary electric compressor 100 is a rotary electric compressor, comprising a housing assembly 1 and a compression mechanism 2. The compression mechanism 2 is used to compress low-pressure refrigerant into high-pressure refrigerant.

[0107] Among them, the shell component includes a first shell 11 and a bracket 12. The axial ends of the first shell 11 are respectively a first end 111 and a second end 112. The bracket 12 is arranged at the first end 111 of the first shell 11 and cooperates with the first shell 11 to form a accommodating cavity 10. An oil separation cavity 113 and a refrigerant discharge port 114 are provided at the second end 112 of the first shell 11, and the oil separation outlet 1131 of the oil separation cavity 113 is connected to the refrigerant discharge port 114.

[0108] In addition, the compression mechanism 2 in this example is a rotary compression mechanism, which is arranged in the accommodating chamber 10. A first silencer chamber 101 is formed between the compression mechanism 2 and the bracket 12. The first silencer chamber 101 is connected to the oil separator inlet 1132 of the oil separator chamber 113 through a first connecting channel 115.

[0109] The first exhaust port 21 of the compression mechanism 2 is in communication with the first muffler chamber 101. A second muffler chamber 22 is further provided in the compression mechanism 2. The second muffler chamber 22 is spaced apart from the first muffler chamber 101 along the axial direction of the compression mechanism 2 and the two are in communication with each other through a second communication channel 23. Furthermore, the compression mechanism 2 may further include a second exhaust port 283 in communication with the second muffler chamber 22.

[0110] like Figure 3 As shown, when the electric compressor 100 is powered and operates normally, the low-pressure refrigerant is converted into high-pressure refrigerant in the compression mechanism 2. The high-pressure refrigerant is discharged into the first silencer chamber 101 and the second silencer chamber 22 through the first exhaust port 21 and the second exhaust port 283 respectively. The high-pressure refrigerant in the second silencer chamber 22 flows into the first silencer chamber 101 through the second connecting channel 23. Subsequently, the high-pressure refrigerant in the first silencer chamber 101 enters the oil separator chamber 113 from the oil separator inlet 1132 through the first connecting channel 115. The separated gaseous refrigerant is finally discharged to the outside of the shell assembly 1 through the refrigerant discharge port 114.

[0111] As a result, the flow noise and pressure pulsation of the high-pressure refrigerant in the housing assembly 1 can be reduced, and the operating noise and vibration of the electric compressor 100 can be reduced.

[0112] Second embodiment

[0113] like Figure 4 As shown, the differences between the second embodiment and the first embodiment include: a first connecting hole 3 is provided at the connection between the first shell 11 and the bracket 12, the first connecting hole 3 is formed on the bracket 12, the first connecting channel 115 is connected to the first silencer chamber 101 through the first connecting hole 3, and the flow area of ​​the first connecting hole 3 is smaller than the flow area of ​​the first connecting channel 115.

[0114] Third embodiment

[0115] like Figure 5 As shown, the difference between the third embodiment and the second embodiment includes: the first communication hole 3 is formed on the first shell 11 .

[0116] Fourth embodiment

[0117] like Figure 6 As shown, the difference between the fourth embodiment and the second embodiment includes: the first shell 11 in the fourth embodiment does not have the first communication channel 115 .

[0118] like Figure 6As shown, in this fourth embodiment, a high-pressure chamber 102 is formed between the wall of the accommodating chamber 10 and the compression mechanism 2. The high-pressure chamber 102 communicates with the first muffler chamber 101 and the oil separator inlet 1132 of the oil separator chamber 113. As a result, the high-pressure refrigerant in the first muffler chamber 101 flows into the high-pressure chamber 102 and then flows into the oil separator chamber 113 through the oil separator inlet 1132.

[0119] Fifth embodiment

[0120] like Figure 7 As shown, the fifth embodiment differs from the fourth embodiment described above in that the second muffler chamber 22 and the high-pressure chamber 102 are further connected via a second connecting hole 24. In this case, the high-pressure refrigerant in the second muffler chamber 22 can also flow into the high-pressure chamber 102 through the second connecting hole 24, thereby ensuring noise reduction while improving exhaust efficiency.

[0121] In the description of the present invention, it should be understood that the terms "center", "up", "vertical", "lateral", "horizontal", "inside", "outside", "axial", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0122] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0123] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0124] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0125] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0126] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An electric compressor, characterized in that include: A housing assembly, the housing assembly comprising a first housing and a bracket, the first housing having a first end and a second end at its axial ends, the bracket being disposed at the first end of the first housing so as to form a receiving cavity between the bracket and the first housing, an oil separation cavity and a refrigerant discharge port being formed on the first housing, the oil separation cavity being disposed near the second end relative to the first end, and the oil separation port of the oil separation cavity being in communication with the refrigerant discharge port; a compression mechanism, the compression mechanism being disposed in the accommodating chamber, a first silencing chamber being formed between the compression mechanism and the bracket, the compression mechanism having a first exhaust port, the first exhaust port being in communication with the first silencing chamber, and the first silencing chamber being in communication with the oil separation inlet of the oil separation chamber; A first communication channel is formed in the side shell of the first housing, and the first communication channel connects the first muffler chamber and the oil separation inlet of the oil separation chamber; A first communicating hole is provided at the connection between the first shell and the bracket, the first communicating channel is connected to the first muffler chamber through the first communicating hole, and the flow area of ​​the first communicating hole is smaller than the flow area of ​​the first communicating channel; A high-pressure chamber is formed between the chamber wall of the accommodating chamber and the compression mechanism, and the high-pressure chamber is connected to the first muffler chamber and the oil separator inlet of the oil separator chamber.

2. The electric compressor according to claim 1, characterized in that The second end of the first shell is closed, and the oil separation chamber is formed in the end shell of the second end.

3. The electric compressor according to claim 1, characterized in that The first communication hole is formed on the bracket, or formed on the first shell, or defined by an insertion tube inserted into the first shell or the bracket.

4. The electric compressor according to claim 1, characterized in that The minimum flow area of ​​the first communicating hole is S1, and the volume of the first muffler cavity is V1, wherein 0.06≤S1 / V1≤2.

0.

5. The electric compressor according to claim 1, characterized in that The compression mechanism has a second silencing chamber therein, and the second silencing chamber is communicated with the first silencing chamber.

6. The electric compressor according to claim 5, characterized in that The second muffler chamber and the first muffler chamber are spaced apart from each other along the axial direction of the compression mechanism. A second communication channel is formed on the compression mechanism, and the second communication channel connects the second muffler chamber and the first muffler chamber.

7. The electric compressor according to claim 6, characterized in that The minimum flow area of ​​the second communicating channel is S2, and the volume of the second muffler cavity is V2, wherein 0.08≤S2 / V2≤2.

2.

8. The electric compressor according to claim 1, characterized in that The compression mechanism has a second silencer chamber in it, which is communicated with the first silencer chamber. The compression mechanism has a second communicating hole, which is communicated with the second silencer chamber and the high-pressure chamber.

9. The electric compressor according to any one of claims 1 to 8, characterized in that: The compression mechanism is a rotary compression mechanism or a scroll compression mechanism.

10. An air conditioning system, characterized in that: The invention comprises an electric compressor according to any one of claims 1 to 9.

11. A vehicle, characterized in that: include: A vehicle body and an air conditioning system mounted on the vehicle body, wherein the air conditioning system is the air conditioning system according to claim 10.

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