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 compression component, a housing component and a first shell. The compression component comprises a cylinder, a piston and a crankshaft. The piston is arranged in the cylinder, and the crankshaft is connected with the piston for driving the piston to rotate. The housing component comprises the first shell. At least part of the compression component is arranged in the first shell. The first shell is provided with a refrigerant discharge outlet. The first shell is provided with an oil separation cavity. An oil separation inlet of the oil separation cavity is communicated with an exhaust port of the compression component. A first communication channel is formed in a shell wall of the first shell. An oil separation outlet of the oil separation cavity is communicated with the refrigerant discharge outlet through the first communication channel. According to the electric compressor, the structure is compact, the stability of exhaust can be improved, the overall oil-gas separation effect can be ensured, and the refrigerant discharge outlet and the oil separation cavity can be designed flexibly.

Description

TECHNICAL FIELD

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

[0002] The electric compressor is a core component of a refrigeration device for a vehicle, is a volumetric compressor with high efficiency, low noise and stable operation, and is widely used in automobile air conditioning systems as the third generation of vehicle-mounted compressors. In recent years, with the development of new energy vehicles, the requirements of vehicles for air conditioning compressor noise, vibration and durability are further improved. The electric compressor, such as a scroll compressor and a rolling rotor compressor, needs to provide lubricating oil to lubricate the friction pairs in the electric compressor during use to reduce the noise generated by the friction pairs during operation. In the prior art, an oil separation structure is arranged in the electric compressor, and the oil separation structure is used to separate the mixed fluid of refrigerant and lubricating oil discharged from the compression chamber of the electric compressor. However, the conventional compressor oil separation structure needs to be designed in cooperation with the size and position of the high-pressure shell exhaust port, and different refrigeration systems have inconsistent requirements for the exhaust port. At the same time, the pump body structure of part of the rotor compressor causes the compression assembly to be arranged at the center of the containing cavity, so that the oil separation cavity cannot be arranged coaxially with the exhaust port. Limited by this, the compressor oil separation structure may have problems such as being unable to be processed, being too small in diameter, and the oil separation insert pipe being unable to be installed, so as to fail to achieve the optimal oil separation efficiency, to be difficult to guarantee the oil return lubrication requirement under the condition of high load working condition, and to be prone to the gas leakage phenomenon. The refrigerant leakage causes the refrigerating capacity of the electric compressor to decrease, the compression efficiency to decrease, and even the reliability requirement of the compressor to be unable to be met. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application is directed to an electric compressor, wherein the oil separation outlet of the oil separation cavity is communicated with the refrigerant discharge port through the first communication channel formed in the shell wall of the first shell, so as to be capable of improving the stability of the exhaust, guaranteeing the overall oil-gas separation effect, and the size and position of the refrigerant discharge port can not affect the oil separation cavity, so that the refrigerant discharge port and the oil separation cavity can be designed flexibly to meet different design requirements.

[0004] The electric compressor according to the embodiments of the present application comprises a compression component, which comprises a cylinder, a piston arranged in the cylinder and a crankshaft connected with the piston for driving the piston to rotate; a housing component, which comprises a first housing, at least part of the compression component is arranged in the first housing, a refrigerant discharge port is formed on the first housing, an oil separation cavity is arranged on the first housing, an oil separation inlet of the oil separation cavity is communicated with an exhaust port of the compression component, a first communication channel is formed in a wall of the first housing, and an oil separation outlet of the oil separation cavity is communicated with the refrigerant discharge port through the first communication channel.

[0005] The electric compressor according to the embodiments of the present application has the advantages that at least part of the compression component is arranged in the first housing, so that the structure of the electric compressor is compact, the oil separation outlet of the oil separation cavity is communicated with the refrigerant discharge port through the first communication channel formed in the wall of the first housing, so that the stability of exhaust gas can be improved, the overall oil-gas separation effect is ensured, the size and position of the refrigerant discharge port do not affect the oil separation cavity, so that the refrigerant discharge port and the oil separation cavity can be designed flexibly to meet different design requirements.

[0006] The electric compressor according to some embodiments of the present application, the first housing is provided with an oil separation outer pipe, and an inner cavity of the oil separation outer pipe defines at least part of the oil separation cavity.

[0007] The electric compressor according to some embodiments of the present application, a lower end of the oil separation outer pipe has a tapered pipe, and a lower port of the tapered pipe is formed as a first oil return hole, and a hole diameter of the first oil return hole is smaller than an inner diameter of the oil separation cavity.

[0008] The electric compressor according to some embodiments of the present application, the first housing has an upper hole section and a lower hole section, and upper and lower ends of the oil separation outer pipe are respectively inserted into the upper hole section and the lower hole section.

[0009] The electric compressor according to some embodiments of the present application, an outer surface of the first housing has a mounting port which is arranged at a position spaced apart from the refrigerant discharge port, and the oil separation outer pipe is adapted to be mounted into the first housing along an axis of the oil separation outer pipe through the mounting port.

[0010] The electric compressor according to some embodiments of the present application, the first housing itself defines the oil separation cavity.

[0011] The electric compressor according to some embodiments of the present application, a lower part of the oil separation cavity is provided with an oil return device, the oil return device has a first oil return hole, and a hole diameter of the first oil return hole is smaller than an inner diameter of the oil separation cavity.

[0012] According to some embodiments of the present application, the oil separation cavity has a second oil return hole in the wall of the oil separation cavity, and the second oil return hole is in communication with the first oil return hole.

[0013] According to some embodiments of the present application, the axial distance between the upper end of the oil separation cavity and the first oil return hole is L1, the axial distance between the oil separation inlet and the first oil return hole is L2, an oil separation inner tube is arranged in the oil separation cavity, the inner cavity of the oil separation inner tube is formed as a gas outlet cavity in communication with the oil separation outlet, and the axial distance between the oil separation inner tube and the first oil return hole is L3, wherein 0.2L1

[0014] According to some embodiments of the present application, the oil separation cavity has a first oil return hole in the lower part of the oil separation cavity, the first oil return hole has a flow area S3, an oil separation inner tube is arranged in the oil separation cavity, the inner cavity of the oil separation inner tube is formed as a gas outlet cavity in communication with the oil separation outlet, the gas outlet cavity has a flow area S2, and at least one of the following three conditions is met: condition one is 0.025≤S2 / S1≤0.45, condition two is 0.015≤S3 / S1≤0.4, and condition three is 0.15≤S3 / S2≤0.65.

[0015] According to some embodiments of the present application, the oil separation inlet extends along the tangential direction of the oil separation cavity, a plane passing through the axis of the oil separation cavity and perpendicular to the axis of the oil separation inlet is a projection plane, the area of the orthographic projection of the oil separation inlet on the projection plane is A, and the area of the orthographic projection on one side of the axis of the oil separation cavity is B, wherein B / A is greater than or equal to 80%.

[0016] According to some embodiments of the present application, the oil separation outlet is arranged on one axial side of the oil separation cavity, the direction of the axis of the oil separation cavity extending towards the oil separation outlet is a positive extension direction, and the axis of the oil separation inlet intersects with the positive extension direction of the axis of the oil separation cavity at an intersection angle θ, wherein 45°≤θ≤90°.

[0017] According to some embodiments of the present application, the axis of the first communication channel is a straight line, the axial length of the first communication channel is less than the axial length of the oil separation cavity, and the axis of the first communication channel coincides with or intersects with the axis of the oil separation cavity.

[0018] According to some embodiments of the present application, the axis of the first shell extends in the transverse direction, the first communication channel is arranged in the top of the first shell and extends in the vertical direction, the upper end of the first communication channel penetrates through the top of the first shell to form the refrigerant discharge outlet, and the oil separation cavity extends downwardly and obliquely from the lower end of the first communication channel.

[0019] The application further provides an air conditioning system.

[0020] The air conditioning system according to the embodiment of the application comprises the electric compressor according to any one of the above embodiments.

[0021] The application further provides a vehicle.

[0022] The vehicle according to the embodiment of the application comprises 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 above embodiments.

[0023] The vehicle, the air conditioning system and the electric compressor according to the above embodiments have the same advantages over the prior art, which will not be repeated here.

[0024] Additional aspects and advantages of the application will be given, partially in the following description, partially become obvious from the following description, or be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a sectional view of an electric compressor according to one embodiment of the application;

[0026] Figure 2 is a sectional view of the electric compressor shown in Figure 1 ;

[0027] Figure 3 is a perspective view of the electric compressor shown in Figure 1 ;

[0028] Figure 4 is a perspective view of a housing component according to one embodiment of the application;

[0029] Figure 5 is a perspective view of a housing component according to another embodiment of the application;

[0030] Figure 6 is a sectional view of a housing component according to one embodiment of the application;

[0031] Figure 7 is a sectional view of an electric compressor according to one embodiment of the application;

[0032] Figure 8 is a sectional view of an electric compressor according to another embodiment of the application;

[0033] Figure 9 is a sectional view of an electric compressor according to yet another embodiment of the application;

[0034] Figure 10 is a sectional view of an electric compressor according to still another embodiment of the application;

[0035] Figure 11 Fig. 1 is a schematic view of a vehicle according to an embodiment of the present application.

[0036] Reference Signs:

[0037] Vehicle 1000,

[0038] Air conditioning system 1001,

[0039] Electric compressor 100,

[0040] Compression component 101, exhaust port 11, cylinder 12, piston 13, crankshaft 14,

[0041] Bearing 15; partition 16; muffler 17; communication passage 18; muffling cavity 19;

[0042] Housing component 102,

[0043] First housing 21, upper hole section 211, lower hole section 212, oil separation cavity wall 22,

[0044] Refrigerant discharge port 213, mounting port 214, accommodation cavity 215,

[0045] Oil separation cavity 30, oil separation inlet 31, first communication passage 32, oil separation outlet 33, second communication passage 34,

[0046] Oil return device 40, first oil return hole 41, second oil return hole 42,

[0047] Oil separation outer pipe 50, tapered pipe 51, oil separation inner pipe 52, gas outlet cavity 521, cyclone separation space 53, filter device 54;

[0048] Plug 60, oil passage 61, bracket 70. DETAILED DESCRIPTION

[0049] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein the same or like reference numerals and characters refer to the same or like components throughout the drawings. The embodiments described below are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0050] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the elements and arrangements of the particular examples are described in the following disclosure. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application can repeatedly refer to reference numerals and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the applicability of other processes and / or the use of other materials.

[0051] In the following, the electric compressor 100 according to an embodiment of the present application is described with reference to Figures 1-11

[0052] As shown in Figure 1 , the electric compressor 100 according to an embodiment of the present application comprises a compression component 101 and a housing component 102.

[0053] In combination Figure 2 , the compression component 101 comprises a cylinder 12, a piston 13 arranged in the cylinder 12, and a crankshaft 14 connected to the piston 13 for driving the piston 13 to rotate. It can be understood that the electric compressor 100 can further comprise a driving motor for driving the crankshaft 14 to rotate, so that the compression component 101 performs compression work.

[0054] The housing component 102 comprises a first housing 21, at least part of the compression component 101 is received in the first housing 21, so that the structural compactness of the electric compressor 100 can be improved.

[0055] The first housing 21 is provided with a refrigerant discharge port 213, and the first housing 21 is provided with an oil separation cavity 30, an oil separation inlet 31 of the oil separation cavity 30 is communicated with an exhaust port 11 of the compression component 101, a first communication passage 32 is formed in a shell wall of the first housing 21, and an oil separation outlet 33 of the oil separation cavity 30 is communicated with the refrigerant discharge port 213 through the first communication passage 32.

[0056] It should be noted that the above-mentioned "the first housing 21 is provided with the oil separation cavity 30" is understood in a broad sense, for example, it can include that the oil separation cavity 30 in Figures 1-3 is defined by an oil separation outer pipe 50 assembled on the first housing 21, that is, the first housing 21 and the oil separation outer pipe 50 are designed in a split type, so that the axis and cross-sectional area of the oil separation cavity 30 defined by the oil separation outer pipe 50 can be freely designed to meet different design requirements. Or, for example, it can also include that the oil separation cavity 30 in Figure 10 and Figure 8 ​As shown, the oil separation cavity 30 can be integrally formed on the first housing 21, so that the oil separation cavity 30 does not need to be assembled separately, which is conducive to simplifying the production steps.

[0057] Specifically, the inner cavity of the first housing 21 is formed as an accommodation cavity 215, and at least part of the compression component 101 is located in the accommodation cavity 215, wherein, as shown, Figure 2 As shown, the compression component 101 has a compression cavity, and the compression cavity has an exhaust port 11, and the compressed refrigerant in the compression cavity is adapted to be discharged through the exhaust port 11, and the exhaust port 11 is in communication with the oil separation inlet 31 of the oil separation cavity 30, and the oil separation outlet 33 of the oil separation cavity 30 is in communication with the refrigerant discharge outlet 213 through the first communication channel 32, so that the refrigerant discharged through the oil separation outlet 33 of the oil separation cavity 30 only flows to the first communication channel 32 and then is discharged from the refrigerant discharge outlet 213, and there is no case that the refrigerant discharged through the oil separation outlet 33 of the oil separation cavity 30 first enters the accommodation cavity 215 and then enters the first communication channel 32.

[0058] Among them, the compression component 101 needs to be lubricated, and the refrigerant is mixed with lubricating oil when it is discharged, and the oil separation cavity 30 can separate the mixed lubricating oil in the refrigerant, and improve the performance of the electric compressor 100.

[0059] In the actual operation process of the electric compressor 100, the mixed fluid of gaseous refrigerant and lubricating oil discharged from the compression cavity is discharged through the exhaust port 11, and the mixed fluid enters the oil separation cavity 30 through the oil separation inlet 31, and then the mixed fluid is gas-liquid separated in the oil separation cavity 30, that is, the gaseous refrigerant and the lubricating oil in the mixed fluid are separated, then the gaseous refrigerant enters the first communication channel 32 through the oil separation outlet 33, and flows through the first communication channel 32 and is discharged from the refrigerant discharge outlet 213, thereby realizing the exhaust of the electric compressor 100.

[0060] Alternatively, the accommodation cavity 215 can be used as an oil storage pool for storing lubricating oil, in which case the separated lubricating oil from the oil separation cavity 30 can be discharged into the accommodation cavity 215, and the oil storage pool provides the lubricating oil to the compression component 101, or the oil separation cavity 30 can also directly provide the separated lubricating oil to the compression component 101 through other oil discharge paths. Thus, the oil return of the electric compressor 100 can be realized to ensure the efficient and reliable operation of the electric compressor 100.

[0061] Thus, by providing the oil separation cavity 30, the mixed fluid of the refrigerant and the lubricating oil discharged from the compression cavity can be gas-liquid separated to realize the exhaust and oil return of the electric compressor 100, and ensure the efficient and reliable operation of the electric compressor 100.

[0062] Specifically, when the accommodating cavity 215 is used as an oil storage pool for storing lubricating oil, if the oil separation outlet 33 is first vented to the accommodating cavity 215 of the first shell 21, the venting pressure will be unstable due to the influence of the lubricating oil, and the venting is also easy to take away the lubricating oil stored in the accommodating cavity 215, losing the significance of the oil separation cavity 30 for gas-liquid separation in advance, and unable to ensure the efficient and reliable operation of the electric compressor 100.

[0063] In the embodiment of the present application, by arranging the first communication channel 32 in the shell wall (i.e. in the wall thickness space) of the first shell 21, and the first communication channel 32 connecting the oil separation outlet 33 and the refrigerant discharge outlet 213, the gaseous refrigerant can be directly discharged through the oil separation outlet 33, the first communication channel 32 and the refrigerant discharge outlet 213, thereby avoiding the problem that the oil separation outlet 33 is first vented to the accommodating cavity 215 of the first shell 21, and then vented by the refrigerant discharge outlet 213, and further ensuring the venting stability of the electric compressor 100, and ensuring the gas-liquid separation and oil return effect of the electric compressor 100.

[0064] Further, the first shell 21 forms an accommodating cavity 215, and at least part of the compression component 101 is located in the accommodating cavity 215, for example: the electric compressor 100 is configured as a rotary compressor, and the existing pump body structure of the rotary compressor causes the compression component 101 to be arranged at the center of the accommodating cavity 215, and the oil separation cavity 30 cannot be arranged coaxially with the refrigerant discharge outlet 213. Limited by this, the oil separation cavity 30 of the rotary compressor is prone to problems such as being unable to be processed, being too small in diameter, and being unable to be installed, etc., and cannot achieve the optimal oil separation efficiency, and it is difficult to ensure the oil return and lubrication requirements under high load conditions, and is prone to gas leakage or refrigerant leakage, thereby causing the refrigerating capacity of the electric compressor 100 to decrease, the compression efficiency to decrease, and even unable to meet the reliability requirements of the electric compressor 100.

[0065] In the embodiment of the present application, by arranging the first communication channel 32 in the shell wall (i.e. in the wall thickness space) of the first shell 21, and the first communication channel 32 connecting the oil separation outlet 33 and the refrigerant discharge outlet 213, the oil separation outlet 33 is directly connected with the refrigerant discharge outlet 213, thereby making the size and position of the refrigerant discharge outlet 213 not affecting the oil separation cavity 30, for example, the axis and cross-sectional area of the first communication channel 32 can be freely designed, and the refrigerant discharge outlet 213 can also be flexibly designed to meet different design requirements.

[0066] According to the electric compressor 100 of the embodiment of the present application, for the compact structure that at least part of the compression component 101 is accommodated in the first shell 21, by arranging the first communication channel 32 that communicates the oil separation outlet 33 and the refrigerant discharge outlet 33 in the shell wall of the first shell 21 (i.e. in the wall thickness space), on one hand, the oil separation outlet 33 can be prevented from discharging gas to the inner cavity of the first shell 21, so that the refrigerant can be directly discharged from the refrigerant discharge outlet 213 through the first communication channel 32, thereby ensuring the pressure stability of the discharged gas and ensuring the overall oil-gas separation effect, on the other hand, the oil separation outlet 33 can be prevented from directly communicating with the refrigerant discharge outlet 213, so that the size and position of the refrigerant discharge outlet 213 do not affect the oil separation cavity 30, so that the refrigerant discharge outlet 213 and the oil separation cavity 30 can be designed flexibly, so that the design of the refrigerant discharge outlet 213 and the oil separation cavity 30 can meet different design requirements. In summary, the electric compressor 100 can ensure sufficient oil return, and the structure is simple and reasonable, which is beneficial to ensure the efficient and reliable operation of the electric compressor.

[0067] In some embodiments, as shown in Figure 1 The first shell 21 is assembled with an oil separation outer pipe 50, and the inner cavity of the oil separation outer pipe 50 forms at least part of the oil separation cavity 30. That is, the oil separation outer pipe 50 and the first shell 21 are a split structure, and the oil separation outer pipe 50 is inserted into the first shell 21. In this way, the oil separation cavity 30 does not need to be processed on the first shell 21, reducing the structural requirements and wall thickness requirements of the first shell 21, so that the first shell 21 can be designed flexibly.

[0068] Further, as shown in Figure 1 , Figures 3-10 The lower end of the oil separation outer pipe 50 has a tapered pipe 51, and the lower end of the tapered pipe 51 forms a first oil return hole 41, and the hole diameter of the first oil return hole 41 is smaller than the inner diameter of the oil separation cavity 30.

[0069] For example, as shown in Figure 1 The axial cross-sectional shape of the pipe wall of the tapered pipe 51 can be configured as a straight line, or as shown in Figure 10 The axial cross-sectional shape of the pipe wall of the tapered pipe 51 can be configured as an arc, which is not limited here.

[0070] For example, the inner diameter of the end of the tapered pipe 51 connected to the oil separation outer pipe 50 is the same as the inner diameter of the oil separation outer pipe 50, that is, the inner diameter of the end of the tapered pipe 51 connected to the oil separation outer pipe 50 is the same as the inner diameter of the oil separation cavity 30, so that the lubricating oil can enter the tapered pipe 51 along the cavity wall of the oil separation cavity 30, and in the flow direction of the lubricating oil, the inner diameter of the tapered pipe 51 gradually decreases, so that the first oil return hole 41 is formed at the end of the tapered pipe 51 away from the oil separation outer pipe 50, and the hole diameter of the first oil return hole 41 is smaller than the inner diameter of the oil separation cavity 30.

[0071] Thus, by providing the tapered pipe 51, the inner wall of the tapered pipe 51 with gradually decreasing inner diameter can guide and converge the lubricating oil when the lubricating oil flows to the first oil return hole 41, so that the lubricating oil can flow towards the first oil return hole 41, improving the oil return reliability, and the refrigerant is not easy to pass through the first oil return hole 41, and can be efficiently discharged from the oil separation outlet 33.

[0072] In some embodiments, as shown in Figure 1 The first shell 21 has an upper hole section 211 and a lower hole section 212, and the upper and lower ends of the oil separation outer pipe 50 are respectively inserted into the upper hole section 211 and the lower hole section 212. For example, the upper hole section 211 and the lower hole section 212 extend towards each other along the same axial direction, and the upper hole section 211 and the lower hole section 212 are spaced apart along the same axial direction.

[0073] Thus, it is convenient to assemble the oil separation outer pipe 50 and the first shell 21, and the upper and lower ends of the oil separation outer pipe 50 are respectively inserted into the upper hole section 211 and the lower hole section 212, that is, the outer walls of the upper and lower ends of the oil separation outer pipe 50 respectively abut the inner walls of the upper hole section 211 and the lower hole section 212, which can enhance the structural stability of the oil separation outer pipe 50 and the sealing between the oil separation outer pipe 50 and the upper hole section 211 and the lower hole section 212, and on the other hand, it is beneficial to reduce the assembly difficulty of the oil separation outer pipe 50 and the first shell 21, and improve the structural compactness.

[0074] For example Figure 1 The wall surface of the lower hole section 212 has a second oil return hole 42, the second oil return hole 42 is lower than the lower end of the tapered pipe 51, and is in communication with the first oil return hole 41. Thus, it is convenient to quickly discharge the oil, and improve the oil return reliability.

[0075] For example, in the flow direction of the lubricating oil, the second oil return hole 42 is located downstream of the tapered pipe 51, and the oil separation cavity 30 is in communication with the internal space of the lower hole section 212, the second oil return hole 42 is in communication with the containing cavity 215, so that the separated lubricating oil in the oil separation cavity 30 can enter the containing cavity 215 in sequence through the first oil return hole 41 and the second oil return hole 42, and then return to the compression component 101 from the containing cavity 215, to realize the oil return of the electric compressor 100.

[0076] As shown in Figure 1 , Figures 3-5 The outer surface of the first shell 21 has a mounting port 214 spaced apart from the refrigerant discharge port 213, and the oil separation outer pipe 50 is adapted to be assembled into the first shell 21 along the axis of the oil separation outer pipe 50 through the mounting port 214.

[0077] Therefore, the oil separation outer pipe 50 in the present application does not need to be installed into the first shell 21 from the refrigerant discharge port 213, but is installed into the first shell 21 from the installation port 214 other than the refrigerant discharge port 213, so that the size of the oil separation outer pipe 50 is not limited by the size of the refrigerant discharge port 213, for example, even if the refrigerant discharge port 213 is very small, the size of the oil separation outer pipe 50 can be larger.

[0078] Therefore, the design of the oil separation outer pipe 50 and the design of the refrigerant discharge port 213 can meet different design requirements, thereby ensuring sufficient oil return of the electric compressor 100.

[0079] Optionally, a plug 60 can be arranged at the installation port 214, and the plug 60 is used to seal the installation port 214, and in some embodiments, the plug 60 can also be designed to have a pressure protection function.

[0080] In some other embodiments, as shown in Figure 8 and Figure 10 , the first shell 21 itself defines the oil separation cavity 30. That is, the oil separation cavity 30 is integrally formed on the first shell 21. Therefore, the step of assembling the oil separation outer pipe 50 is omitted, the number of parts is reduced, and the cost is reduced. Alternatively, the oil separation cavity wall 22 is integrally arranged with the first shell 21, so that the oil separation cavity 30 does not need to be separately arranged, which is beneficial to simplify the production steps and improve the production efficiency,

[0081] For example, as shown in Figure 8 and Figure 10 , the first shell 21 has an oil separation cavity wall 22, the oil separation cavity 30 is formed in the oil separation cavity wall 22, and the oil separation inlet 31 is formed on the oil separation cavity wall 22, and the oil separation inlet 31 is directly or indirectly communicated with the exhaust port 11 of the compression component 101.

[0082] Further, as shown in Figure 8 , the lower part of the oil separation cavity 30 is provided with an oil return device 40, the oil return device 40 has a first oil return hole 41, the first oil return hole 41 is communicated with the oil separation cavity 30, and the diameter of the first oil return hole 41 is smaller than the inner diameter of the oil separation cavity 30. Wherein, the oil return device 40 is arranged in the oil separation cavity 30, and the diameter of the first oil return hole 41 on the oil return device 40 is smaller than the inner diameter of the oil separation cavity 30, so that the oil return device 40 can play a guiding and converging role on the lubricating oil, so that the lubricating oil can flow towards the first oil return hole 41, and the reliability of the oil return is improved, and the refrigerant is not easy to pass through the first oil return hole 41, and can be efficiently discharged from the oil separation outlet 33.

[0083] It should be noted that the extension direction of the first oil return hole 41 on the oil return device 40 is not limited, for example, it can extend along the axial direction of the oil separation cavity 30 (for example Figure 8As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). Figure 9 As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B).

[0084] As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). Figure 8 As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). Figure 9 As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). Figure 8 As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). Figure 9 As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B).

[0085] As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). Figure 8 As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B).

[0086] As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B).

[0087] As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). Figure 10 As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B).

[0088] As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B). As shown, the oil separation cavity 30 can extend along a straight line, or can extend along a curve or a broken line, such as extending along an axial direction of the oil separation cavity 30 first, and then extending along a radial direction of the oil separation cavity 30 (for example, as shown in FIG. 2B).

[0089] Further, as shown in Figure 1 、 Figure 8 and Figure 9 , the oil separation cavity 30 has a second oil return hole 42 on the cavity wall, and the second oil return hole 42 is in communication with the first oil return hole 41. For example, whether the oil return device 40 defines the first oil return hole 41 or the oil return device 40 defines the first oil return hole, the second oil return hole 42 can be provided on the cavity wall of the oil separation cavity 30. Among them, the relative position of the first oil return hole 41 and the second oil return hole 42 is not limited, for example, when the first oil return hole 41 extends along the axial direction (for example Figure 1 and Figure 8 ), the second oil return hole 42 can be lower than the first oil return hole 41, and for example, when the first oil return hole 41 first extends along the axial direction of the oil separation cavity 30 and then extends along the radial direction of the oil separation cavity 30, the second oil return hole 42 can be opposite to the first oil return hole 41 along the radial direction, and the like. Thus, it is convenient to quickly discharge the accumulated oil and improve the oil return reliability.

[0090] For example, the second oil return hole 42 is provided on the cavity wall of the oil separation cavity 30 close to the containing cavity 215, and the second oil return hole 42 is in communication with the containing cavity 215. Thus, in the actual oil return process of the electric compressor 100, the lubricating oil separated in the oil separation cavity 30 enters the containing cavity 215 through the first oil return hole 41 and the second oil return hole 42 in turn, and then flows back to the compression component 101 from the containing cavity 215, so as to realize the oil return of the electric compressor 100.

[0091] Optionally, Figure 1 and Figure 8 , in the embodiments shown in the drawings, the extension direction of the axis of the first oil return hole 41 and the extension direction of the axis of the second oil return hole 42 can intersect, so that the lubricating oil can be buffered and slowed down when passing through the first oil return hole 41 and entering the second oil return hole 42, thereby avoiding the problem of unstable flow caused by too fast flow of the lubricating oil when entering the containing cavity 215.

[0092] As shown in Figure 6 , the axial distance between the upper end of the oil separation cavity 30 and the first oil return hole 41 is L1, the axial distance between the oil separation inlet 31 and the first oil return hole 41 is L2, the oil separation cavity 30 is provided with an oil separation inner tube 52 (i.e. at least part of the oil separation inner tube 52 is located in the oil separation cavity 30), the inner cavity of the oil separation inner tube 52 is formed as an air outlet cavity 521 in communication with the oil separation outlet 33, and the axial distance between the oil separation inner tube 52 and the first oil return hole 41 is L3.

[0093] It should be noted that the "axial distance" between the two refers to the minimum distance between the two along the axial extension direction of the oil separation cavity 30.

[0094] The axial distance between the upper end of the oil separation cavity 30 and the first oil return hole 41 is L1. It can be understood that, the first plane is perpendicular to the axis of the oil separation cavity 30, and passes through the end point of the oil separation cavity 30 in the direction parallel to the axis of the oil separation cavity 30, which is farthest from the first oil return hole 41; the second plane is perpendicular to the axis of the oil separation cavity 30, and passes through the end point of the first oil return hole 41 on the axis of the oil separation cavity 30, which is closest to the oil separation inlet 31; and the vertical distance between the first plane and the second plane is L1.

[0095] The axial distance between the oil separation inlet 31 and the first oil return hole 41 is L2. It can be understood that, the third plane is perpendicular to the axis of the oil separation cavity 30, and passes through the end point of the oil separation inlet 31 in the direction parallel to the axis of the oil separation cavity 30, which is closest to the first oil return hole 41; the second plane is perpendicular to the axis of the oil separation cavity 30, and passes through the end point of the first oil return hole 41 on the axis of the oil separation cavity 30, which is closest to the oil separation inlet 31; and the vertical distance between the third plane and the second plane is L2.

[0096] The axial distance between the oil separation inner tube 52 and the first oil return hole 41 is L3. It can be understood that, the fourth plane is perpendicular to the axis of the oil separation cavity 30, and passes through the end point of the oil separation inner tube 52 in the direction parallel to the axis of the oil separation cavity 30, which is closest to the first oil return hole 41; the second plane is perpendicular to the axis of the oil separation cavity 30, and passes through the end point of the first oil return hole 41 on the axis of the oil separation cavity 30, which is closest to the upper end of the oil separation cavity 30; and the vertical distance between the fourth plane and the second plane is L3.

[0097] In some embodiments, 0.2L1

[0098] It should be noted that the conventional design of the oil separation cavity can achieve good oil separation effect under normal working conditions, but cannot meet the requirements under the working condition with heavy oil separation load. The applicant found that the phenomenon of “secondary entrainment” would occur in the oil separation cavity 30, that is, the inlet position of the oil separation inner tube 52 is improperly set, and the lubricating oil separated in the cavity would be taken away again at the same time as the refrigerant is discharged.

[0099] Therefore, by controlling the axial distance L3 between the oil separation inner tube 52 and the first oil return hole 41 to be within the above-mentioned proportion range, the phenomenon of “secondary entrainment” in the oil separation cavity 30 can be avoided while ensuring the oil separation efficiency.

[0100] Thus, when the above relationship is satisfied among L1, L2 and L3, the discharge pressure of the electric compressor 100 is stabilized, and the electric compressor 100 has optimal discharge efficiency and oil return efficiency, thereby ensuring high efficiency and reliable operation of the electric compressor 100. For example, the outer wall of the oil separation inner tube 52 is spaced apart from the cavity wall of the oil separation cavity 30 to form the cyclone separation space 53, and the oil separation inlet 31 extends along the tangential direction of the oil separation cavity 30.

[0101] For example, the oil separation inner tube 52 is inserted into the upper region of the oil separation outer tube 50 (or the oil separation cavity wall 22), the outer wall of the oil separation inner tube 52 is spaced apart from the inner wall of the oil separation outer tube 50 (or the oil separation cavity wall 22) to form the cyclone separation space 53, the oil separation inlet 31 is provided on the oil separation outer tube 50 (or the oil separation cavity wall 22) and extends along the tangential direction, and the oil separation inlet 31 communicates with the cyclone separation space 53, the inner cavity of the oil separation inner tube 52 is formed as the gas outlet cavity 521, the upper end of the gas outlet cavity 521 communicates with the oil separation outlet 33, and the lower end of the gas outlet cavity 521 communicates with the oil separation cavity 30.

[0102] Thus, the mixed fluid of the refrigerant and the lubricating oil discharged from the compression component 101 enters the cyclone separation space 53 through the discharge port 11, and the separation of the refrigerant and the lubricating oil is achieved in the cyclone separation space 53, then the refrigerant enters the gas outlet cavity 521 along the lower end of the gas outlet cavity 521, and rises along the axial direction of the gas outlet cavity 521, and then enters the first communication passage 32 through the oil separation outlet 33, and is discharged through the refrigerant discharge port 213, thereby achieving the discharge of the electric compressor 100. For example, the separated lubricating oil directly flows downward along the axial direction of the oil separation cavity 30, and is discharged to the containing cavity 215 through the first oil return hole 41 and the second oil return hole 42, and is returned to the compression component 101 from the containing cavity 215, thereby achieving the oil return of the electric compressor 100.

[0103] In some embodiments, the oil separation cavity 30 has a flow area S1, the lower portion of the oil separation cavity 30 is provided with a first oil return hole 41, the first oil return hole 41 has a flow area S3, the oil separation cavity 30 is provided with an oil separation inner tube 52 (i.e., at least a portion of the oil separation inner tube 52 is located in the oil separation cavity 30), the inner cavity of the oil separation inner tube 52 forms an air outlet cavity 521 in communication with the oil separation outlet 33, the air outlet cavity 521 has a flow area S2, and at least one of the following three conditions is met: condition one is 0.025≤S2 / S1≤0.45, for example, 0.025, 0.035, 0.045, 0.055, 0.1, 0.15, 0.25, 0.3, 0.35, 0.45, and the like; condition two is 0.015≤S3 / S1≤0.4, for example, 0.015, 0.025, 0.03, 0.04, 0.05, 0.15, 0.2, 0.3, 0.38, 0.4, and the like; and condition three is 0.15≤S3 / S2≤0.65, for example, 0.15, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.62, 0.65, and the like.

[0104] By controlling the ratio of the flow area S2 of the air outlet cavity 521 to the flow area S1 of the oil separation cavity 30 to meet the above value range, better centrifugal separation efficiency can be achieved. Further, the use requirements of the higher oil separation load condition are met.

[0105] By controlling the ratio of the flow area S3 of the first oil return hole 41 to the flow area S1 of the oil separation cavity 30 to meet the above value range, the cross section of the first oil return hole 41 can fully utilize the influence of the centrifugal flow field pressure distribution to generate sufficient pressure driving force, so that the separated lubricating oil can be smoothly discharged through the first oil return hole 41. Further, the use requirements of the higher oil separation load condition are met.

[0106] By controlling the ratio of the flow area S3 of the first oil return hole 41 to the flow area S2 of the air outlet cavity 521 to meet the above value range, the first oil return hole 41 can be prevented from gas leakage, which can cause oil separation failure. Further, the use requirements of the higher oil separation load condition are met.

[0107] That is, the flow area S1 of the oil separation cavity 30, the flow area S2 of the air outlet cavity 521, and the flow area S3 of the first oil return hole 41 need to meet any one of the above three conditions, or two conditions, or three conditions. In this way, the exhaust pressure of the electric compressor 100 can be stabilized, and the electric compressor 100 has optimal exhaust efficiency and oil return efficiency, further meeting the use requirements of the higher oil separation load condition, and ensuring efficient and reliable operation of the electric compressor 100.

[0108] It should be noted that the oil separator inner tube 52 mentioned above may be assembled to the first housing 21, for example, the oil separator inner tube 52 may be inserted into the first housing 21, or the oil separator inner tube 52 may be connected to the oil separator outer tube 50 (assembled or as a whole), or the oil separator inner tube 52 may be as a whole with the first housing 21, etc., and no limitation is made here.

[0109] In some embodiments, the axis of the first oil return hole 41 coincides with or is parallel to the axis of the oil separator 30. This facilitates the direct flow of the separated lubricating oil along the axial direction of the oil separator 30 to the first oil return hole 41, thereby increasing the flow velocity of the lubricating oil and thus improving the oil return efficiency of the electric compressor 100.

[0110] In some embodiments, such as Figures 3-5 As shown, the oil inlet 31 extends tangentially along the oil separator cavity 30, as... Figure 1 and Figure 6 As shown, the plane passing through the axis of the oil separator chamber 30 and perpendicular to the axis of the oil separator inlet 31 is taken as the projection plane. The area of ​​the orthographic projection of the oil separator inlet 31 on the projection plane is A, and the area of ​​the orthographic projection of the oil separator inlet 31 on the projection plane located on one side of the axis of the oil separator chamber 30 is B, where B / A is greater than or equal to 80%. Therefore, ensuring sufficient inlet diameter and sufficient tangential rotational force can improve the efficiency of cyclone separation of refrigerant and lubricating oil, and improve exhaust efficiency and oil return efficiency. Furthermore, ensuring that the refrigerant flowing into the oil separator inlet 31 enters the oil separator chamber 30 tangentially in the same direction reaches the critical separation velocity of lubricating oil particles, forming an effective centrifugal separation flow field pattern, and ensuring the efficiency of cyclone separation of refrigerant and lubricating oil.

[0111] In some embodiments, such as Figures 2-3 As shown, a second connecting channel 34 is formed inside the first housing 21. One end of the second connecting channel 34 is connected to the exhaust port 11 of the compression component 101, and the other end of the second connecting channel 34 is connected to the oil separator inlet 31.

[0112] Therefore, by setting the second connecting channel 34, the mixed fluid discharged from the exhaust port 11 can be guided so that the mixed fluid of gaseous refrigerant and lubricating oil discharged from the compression component 101 flows to the oil separator inlet 31 through the second connecting channel 34 after being discharged through the exhaust port 11. Then the mixed fluid enters the oil separator chamber 30 for separation.

[0113] Of course, the present invention is not limited thereto; for example, in other embodiments, such as... Figures 7-8 As shown, the second connecting channel 34 may not be machined on the first housing 21. In this case, the exhaust port 11 of the compression component 101 can be connected to the receiving cavity 215, and the receiving cavity 215 can be connected to the oil separator inlet 31. Thus, the exhaust port 11 of the compression component 101 can also be connected to the oil separator inlet 31.

[0114] Optionally, as shown in Figure 1 The oil separation inlet 31 can be arranged on the upper hole section 211, so that the oil separation inlet 31 is arranged on the upper hole section 211 of the first shell 21, so that the oil separation inlet 31 does not need to be arranged on the oil separation outer pipe 50, and the height of the oil separation inlet 31 can be increased, the length of the oil-gas separation can be increased, and the oil-gas separation effect can be improved.

[0115] In some embodiments, as shown in Figure 4 and Figure 5 The oil separation outlet 33 is arranged on the side of the oil separation cavity 30 away from the first oil return hole 41 in the axial direction, the direction of the oil separation cavity 30 extending along the axis is the positive extension direction, and the intersection angle θ between the axial extension of the oil separation inlet 31 and the positive extension direction of the axis of the oil separation cavity 30 is 45°≤θ≤90°.

[0116] It should be noted that the lubricating oil separated by the oil separation cavity 30 adheres to the inner wall of the oil separation cavity 30 and flows and accumulates at the bottom of the oil separation cavity 30 under the influence of gravity. For a state with low flow rate or small system oil circulation rate, the oil return is not smooth, and through calculation and analysis, it is found that when the intersection angle θ is too small, the tangential component of the flow rate of the lubricating oil at the oil separation inlet 31 is also too small, so that the critical separation speed of the lubricating oil cannot be reached, and oil separation failure is easily caused.

[0117] In the present application, by controlling the intersection angle θ between the axial extension of the oil separation inlet 31 and the positive extension direction of the axis of the oil separation cavity 30, and θ satisfies: 45°≤θ≤90°, the axial component of the speed of the lubricating oil entering the oil separation inlet 31 is used to improve the oil return capacity of the inner wall surface of the oil separation cavity 30, to ensure that the separated lubricating oil can be quickly discharged from the first oil return hole 41, and to ensure reliable operation of the electric compressor 100.

[0118] For example, the intersection angle θ between the axial extension of the oil separation inlet 31 and the positive extension direction of the axis of the oil separation cavity 30 is 90° (as shown in Figure 4 ), or the intersection angle θ between the axial extension of the oil separation inlet 31 and the positive extension direction of the axis of the oil separation cavity 30 is 60°, or the intersection angle θ between the axial extension of the oil separation inlet 31 and the positive extension direction of the axis of the oil separation cavity 30 is 80° (as shown in Figure 5 ).

[0119] Therefore, when the intersection angle between the axial extension of the oil separation inlet 31 and the positive extension direction of the axis of the oil separation cavity 30 satisfies the above value range, the refrigerant can enter the gas outlet cavity 521 along the lower end of the gas outlet cavity 521, then rise along the axial direction of the gas outlet cavity 521, then enter the first communication passage 32 through the oil separation outlet 33, and then be discharged through the refrigerant discharge outlet 213, so as to realize the exhaust of the electric compressor 100 and improve the exhaust efficiency.

[0120] In some embodiments, as shown in Figure 1 , Figures 3-8 the axis of the first communication passage 32 is a straight line, and the axial length of the first communication passage 32 is less than the axial length of the oil separation cavity 30, and the axis of the first communication passage 32 coincides with or intersects with the axis of the oil separation cavity 30.

[0121] Thus, the first communication passage 32 is facilitated to be formed, and the axial length of the first communication passage 32 is less than the axial length of the oil separation cavity 30, which is conducive to the miniaturization design of the electric compressor 100, and the axis of the first communication passage 32 coincides with or intersects with the axis of the oil separation cavity 30, which is conducive to reducing the exhaust pressure loss when the electric compressor 100 exhausts, and is conducive to improving the exhaust efficiency.

[0122] In some embodiments, as shown in Figures 1-3 the axis of the first housing 21 extends in the transverse direction, the first communication passage 32 is located at the top of the first housing 21 and extends in the vertical direction, the upper end of the first communication passage 32 penetrates the top of the first housing 21 to form a refrigerant discharge port 213, and the oil separation cavity 30 extends downwardly from the lower end of the first communication passage 32.

[0123] For example, as shown in Figure 5 the upper end of the first communication passage 32 penetrates the top of the first housing 21 to form the refrigerant discharge port 213, so as to facilitate the processing and forming of the refrigerant discharge port 213, and the oil separation cavity 30 extends downwardly from the lower end of the first communication passage 32 towards a direction away from the second communication passage 34, so as to facilitate the oil separation cavity 30 to avoid the interference with the part of the compression component 101 extending into the containing cavity 215, to avoid the interference between them, to facilitate the reasonable layout, and the extension direction of the oil separation cavity 30 is substantially the same as the direction of the gravity of the lubricating oil, so as to facilitate the separated lubricating oil to flow along the oil separation cavity 30 to the first oil return hole 41 under the action of its own gravity, and to improve the oil return efficiency of the electric compressor 100.

[0124] Alternatively, as shown in Figure 4 the first communication passage 32 is located obliquely above the compression component 101 and the axis of the first communication passage 32 extends in the vertical direction, the oil separation cavity 30 extends vertically downwardly from the lower end of the first communication passage 32, and the oil separation cavity 30 is located at the side of the compression component 101, at this time, the compression component 101 can also be avoided. Thus, the extension direction of the oil separation cavity 30 is the same as the direction of the gravity of the lubricating oil, so as to facilitate the separated lubricating oil to flow along the oil separation cavity 30 to the first oil return hole 41 under the action of its own gravity, and to improve the oil return efficiency of the electric compressor 100.

[0125] It should be noted that the compression component 101 according to the embodiment of the present application is a rotary compression mechanism, but the specific structure is not limited to this, and can be a single-cylinder compression mechanism or a multi-cylinder compression mechanism. In addition, the electric compressor 100 can be a horizontal compressor whose central axis extends in the transverse direction or is slightly inclined to the horizontal line, or can be a vertical compressor whose central axis extends in the vertical direction or is slightly inclined to the vertical line, and the like.

[0126] For example, in the example shown in Figure 2 The compression component 101 is a double-cylinder compression mechanism, which includes two cylinders 12, two pistons 13, two bearings 15, a partition plate 16, and a muffler 17. The two cylinders 12 are arranged in the axial direction and are spaced apart from each other, the partition plate 16 is arranged between the two cylinders 12, and the two bearings 15 are arranged on both sides of the two bearings 15. Each cylinder 12 is provided with a piston 13, and the crankshaft 14 penetrates the two pistons 13 to drive the two pistons 13 to roll in the two cylinders 12, respectively, to achieve compression. Each bearing 15 has an exhaust port 11 that communicates with the inner cavity of the cylinder 12.

[0127] The shell component 102 further includes a bracket 70, one axial end of the first shell 21 is closed, the other axial end of the first shell 21 is open, and is closed by the bracket 70. The axial direction of the first shell 21 is the same as the axial direction of the compression component 101 and is in the transverse direction. An exhaust port 11 on one of the two bearings 15 is in communication with a muffling cavity 19 formed between the bearing 15 and the bracket 70. Another exhaust port 11 on the other bearing 15 is in communication with another muffling cavity 19 formed between the bearing 15 and the muffler 17. The two cylinders 12, the two bearings 15, and the partition plate 16 are provided with through communication passages 18. The communication passages 18 communicate the muffling cavities 19 on both sides. The muffling cavities 19 defined by the bracket 70 are in communication with the oil inlet 31 through the second communication passage 34 or the accommodating cavity 215.

[0128] The present application also provides an air conditioning system 1001.

[0129] As shown in Figure 11 The air conditioning system 1001 according to the embodiment of the present application includes the electric compressor 100 according to any one of the above embodiments.

[0130] According to an embodiment of the air conditioning system 1001 of the present invention, the electric compressor 100, by providing a first connecting channel 32, can, on the one hand, prevent the oil separator outlet 33 from exhausting into the inner cavity of the first housing 21, so that the refrigerant can be directly discharged from the refrigerant outlet 213 through the first connecting channel 32, thereby ensuring stable exhaust pressure and overall oil-gas separation effect. On the other hand, it can prevent the oil separator outlet 33 from directly communicating with the refrigerant outlet 213, so that the size and position of the refrigerant outlet 213 do not affect the oil separator chamber 30, allowing for flexible design of both the refrigerant outlet 213 and the oil separator chamber 30 to meet different design requirements. In summary, it can ensure sufficient oil return of the electric compressor 100, and the structure is simple and reasonable, which is conducive to ensuring efficient and reliable operation of the electric compressor.

[0131] The present invention also proposes a vehicle 1000.

[0132] like Figure 11 As shown, a vehicle 1000 according to an embodiment of the present invention includes: a vehicle body and an air conditioning system 1001 mounted on the vehicle body, wherein the air conditioning system 1001 is the air conditioning system 1001 described in the above embodiment.

[0133] According to an embodiment of the vehicle 1000 of the present invention, the electric compressor 100 of its air conditioning system 1001, by providing a first connecting channel 32, can, on the one hand, prevent the oil separator outlet 33 from exhausting into the inner cavity of the first housing 21, so that the refrigerant can be directly discharged from the refrigerant outlet 213 through the first connecting channel 32, thereby ensuring stable exhaust pressure and overall oil-gas separation effect. On the other hand, it can prevent the oil separator outlet 33 from directly communicating with the refrigerant outlet 213, so that the size and position of the refrigerant outlet 213 do not affect the oil separator chamber 30, allowing for flexible design of both the refrigerant outlet 213 and the oil separator chamber 30 to meet different design requirements. In summary, it can ensure sufficient oil return of the electric compressor 100, and the structure is simple and reasonable, which is conducive to ensuring the efficient and reliable operation of the electric compressor.

[0134] It should be noted that in this invention, the specific type of the vehicle 1000 is not limited. For example, the vehicle 1000 can be a traditional fuel vehicle or a new energy vehicle. The new energy vehicle includes, but is not limited to, pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0135] In some embodiments, the new energy vehicle can be a pure electric vehicle with a motor as a main driving force, and in other embodiments, the new energy vehicle can also be a hybrid vehicle with an internal combustion engine and a motor as a main driving force. Regarding the internal combustion engine and the motor mentioned in the above embodiments for providing driving force for the new energy vehicle, the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the way to provide electric energy for the motor can use power batteries, hydrogen fuel cells, etc., which are not specially limited here. It should be noted that this is only an exemplary description of the structure of the new energy vehicle, and does not limit the protection scope of the present application.

[0136] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0137] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0138] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0139] In the present disclosure, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can mean the first feature is directly above or obliquely above the second feature, or simply means the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can mean the first feature is directly below or obliquely below the second feature, or simply means the first feature is horizontally lower than the second feature.

[0140] In the description of the present disclosure, 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 disclosure. In the present disclosure, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any 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 disclosure and the features of the different embodiments or examples without contradiction.

[0141] Although the embodiments of the present disclosure 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 disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. An electric compressor characterized by, The application relates to a compressor, comprising: a compression unit, which comprises a cylinder, a piston arranged in the cylinder, and a crankshaft connected to the piston for driving the piston to rotate; a housing unit, which comprises a first housing, at least part of the compression unit is arranged in the first housing, a refrigerant discharge port is formed on the first housing, the first housing is provided with an oil separation cavity, an oil separation inlet of the oil separation cavity is communicated with an exhaust port of the compression unit, a first communication channel is formed in a shell wall of the first housing, and an oil separation outlet of the oil separation cavity is communicated with the refrigerant discharge port through the first communication channel; a second communication channel is formed in the first housing, one end of the second communication channel is communicated with the exhaust port of the compression unit, and the other end of the second communication channel is communicated with the oil separation inlet; an overflow area of the oil separation cavity is S1, a lower part of the oil separation cavity is provided with a first oil return hole, an overflow area of the first oil return hole is S3, an inner tube of the oil separation cavity is provided with an air outlet cavity which is formed in an inner cavity of the inner tube and is communicated with the oil separation outlet, an overflow area of the air outlet cavity is S2, and at least one of the following three conditions is met, condition one is 0.025<=S2 / S1<=0.45, condition two is 0.015<=S3 / S1<=0.4, and condition three is 0.15<=S3 / S2<=0.

65.

2. The electric compressor of claim 1, wherein An outer tube of the oil separation cavity is assembled on the first housing, and an inner cavity of the outer tube forms at least part of the oil separation cavity.

3. The electric compressor of claim 2, wherein A tapered tube is arranged at a lower end of the outer tube of the oil separation cavity, and a lower port of the tapered tube is formed as the first oil return hole, and a hole diameter of the first oil return hole is smaller than an inner diameter of the oil separation cavity.

4. The electric compressor of claim 3, wherein The first housing is provided with an upper hole section and a lower hole section, and upper and lower ends of the outer tube of the oil separation cavity are respectively inserted into the upper hole section and the lower hole section.

5. The electric compressor of claim 2, wherein An installation port is arranged on an outer surface of the first housing and is spaced from the refrigerant discharge port, and the outer tube of the oil separation cavity is adapted to be assembled into the first housing along an axis of the outer tube through the installation port.

6. The electric compressor of claim 1, wherein The first housing defines the oil separation cavity.

7. The electric compressor of claim 6, wherein A lower part of the oil separation cavity is provided with an oil return device, the oil return device is provided with the first oil return hole, and a hole diameter of the first oil return hole is smaller than an inner diameter of the oil separation cavity.

8. The electric compressor of claim 3 or 7, characterized in that A second oil return hole is arranged on a cavity wall of the oil separation cavity and is communicated with the first oil return hole.

9. The electric compressor of claim 3 or 7, wherein An axial distance between an upper end of the oil separation cavity and the first oil return hole is L1, an axial distance between the oil separation inlet and the first oil return hole is L2, the inner tube of the oil separation cavity is provided with an air outlet cavity which is formed in an inner cavity of the inner tube and is communicated with the oil separation outlet, and an axial distance between the inner tube of the oil separation cavity and the first oil return hole is L3, wherein 0.2L1 10. The electric compressor of claim 1, wherein The oil separation inlet extends along a tangent of the oil separation cavity, a plane which passes through an axis of the oil separation cavity and is perpendicular to an axis of the oil separation inlet is a projection plane, an area of a normal projection of the oil separation inlet on the projection plane is A, and an area of the normal projection on one side of the axis of the oil separation cavity is B, wherein B / A is greater than or equal to 80%.

11. The electric compressor of claim 1, wherein The oil separation outlet is arranged at one axial side of the oil separation cavity, the direction of the axial line of the oil separation cavity extending towards the oil separation outlet is a positive extending direction, and the axial line of the oil separation inlet intersects with the positive extending direction of the axial line of the oil separation cavity at an angle θ, wherein 45°≤θ≤90°.

12. The electric motor compressor according to claim 1, characterized in that, The axial line of the first communication passage is a straight line, and the axial length of the first communication passage is less than the axial length of the oil separation cavity, and the axial line of the first communication passage coincides with or intersects with the axial line of the oil separation cavity.

13. The electric compressor of claim 12, wherein, The axial line of the first shell extends in a transverse direction, the first communication passage is arranged at the top of the first shell and extends in a vertical direction, the upper end of the first communication passage penetrates the top of the first shell to form the refrigerant discharge outlet, and the oil separation cavity extends downwardly and obliquely from the lower end of the first communication passage.

14. An air conditioning system, characterised in that, An electric compressor comprising any one of the features of claims 1-13.

15. A vehicle characterized by comprising: An air conditioning system comprising: A vehicle body and an air conditioning system mounted on the vehicle body, the air conditioning system being the air conditioning system according to claim 14.

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