An outer circulation cooling air supplementing structure of an electric scroll compressor

Abstract

The present application relates to the technical field of air conditioning electric scroll compressor for vehicle, in particular to an external circulation cooling air supplement structure of electric scroll compressor, which comprises a lower shell, an external circulation air channel of the lower shell, a lower sealing steel gasket, an external circulation air channel of a middle shell, the middle shell, an upper shell sealing steel gasket, an external circulation air channel of the upper shell, the upper shell, a static disc, a winding, a stator circumferential mounting surface, a stator, a lower shell bottom surface, an IGBT mounting surface, an IGBT, a compressor air inlet, an air supplement hole, a guide vane, a plug and an upper shell air outlet hole; the structure further reduces the heat generated by the IGBT by using the guide vane; the heat generated by the motor is reduced by using the external circulation heat exchange mode; a brand new refrigerant flow channel is formed, so that the overall temperature of the compressor is more stable; the sealing steel gasket with adjustable flow; the compressor air inlet flow is increased, and the compressor performance is improved; thereby solving the problem that the electric scroll compressor has no active cooling measures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric scroll compressor for vehicle air conditioner, and particularly relates to an external circulation cooling and air supplement structure of electric scroll compressor. BACKGROUND

[0002] At present, with the large application of new energy vehicles in various vehicle models, the displacement of the corresponding air conditioner compressor is also larger and larger, and the IGBT of the controller part and the motor are the main sources of heat, and the heat generated will directly affect the reliability of the compressor. The temperature generated by the IGBT (usually multiple IGBTs or an IPM) will cause the temperature in the whole controller cavity to rise, directly affecting the safety of the PCB board and the safety of the components on it. At the same time, the IGBT itself will also be burned out due to the excessive temperature. The space formed by the assembly relationship, gap and the like between the parts is not too much heat taken away by the refrigerant entering the space, resulting in that as the power of the IGBT continuously increases, the temperature in the whole controller cavity also continuously rises, causing the controller to abnormally stop and the probability of burning out to greatly increase. This way is a passive cooling way, and the motor in the compressor is another heat source of the electric control part. At present, the heat dissipation of the motor is also a passive heat dissipation, which only uses the small gap naturally formed according to the structure and assembly relationship of the motor. The refrigerant takes away the heat generated by the motor in the flow process, and no targeted active cooling way is formed. SUMMARY

[0003] The present application aims to provide an external circulation cooling and air supplement structure of electric scroll compressor, and aims to solve the problem that the electric scroll compressor has no active cooling measures.

[0004] To achieve the above-mentioned purpose, the present application provides an external circulation cooling and air supplement structure of electric scroll compressor, which comprises a lower shell, a lower shell external circulation air duct, a lower sealing steel gasket, a middle shell external circulation air duct, a middle shell, an upper shell sealing steel gasket, an upper shell external circulation air duct, an upper shell, a static disc, a winding, a stator circumferential mounting surface, a stator, a lower shell bottom surface, an IGBT mounting surface, an IGBT, a compressor air inlet, an air supplement hole, a guide vane, a plug and an upper shell air outlet.

[0005] The lower shell outer circulation air passage is arranged on one side of the lower shell, the lower sealing steel gasket is connected with the lower shell and located on one side of the lower shell close to the lower shell outer circulation air passage, the middle shell outer circulation air passage is communicated with the lower shell outer circulation air passage and located on one side of the lower shell outer circulation air passage, the middle shell is connected with the lower shell and located on one side of the lower shell, the upper shell sealing steel gasket is connected with the middle shell and located on one side of the middle shell, the upper shell outer circulation air passage is communicated with the middle shell outer circulation air passage and located on the side of the middle shell outer circulation air passage, the upper shell is arranged on the side of the upper shell outer circulation air passage, the static disc is arranged on one side of the upper shell, the winding is arranged on the side of the lower shell, the stator circumferential mounting surface is arranged on the side of the lower shell outer circulation air passage, the stator is connected with the stator circumferential mounting surface and located on one side of the stator circumferential mounting surface, the lower shell bottom surface is connected with the lower shell and located on one side of the lower shell, the IGBT mounting surface is arranged on the side of the lower shell, the IGBT is connected with the IGBT mounting surface and located on one side of the IGBT mounting surface away from the lower shell, the compressor air inlet is arranged on the side of the lower shell, the air supplementing hole is arranged on one side of the compressor air inlet, the guide vane is arranged on one side of the lower shell, the plug is connected with the upper shell and located on one side of the upper shell, and the upper shell air outlet is arranged on the side of the upper shell outer circulation air passage.

[0006] The electric scroll compressor outer circulation cooling air supplementing structure further comprises a bolt, which is threadedly connected with the lower shell and located on one side of the lower shell.

[0007] The application discloses an outer circulation cooling air supplementing structure of an electric scroll compressor, adopts a segmented shell combined with an outer circulation heat exchange mode, designs a bearing seat bottom cooling combined with a surrounding cooling of guide vanes in terms of IGBT heat dissipation, and enables refrigerant to enter the bearing seat bottom and further cool the surrounding area of the bearing seat in a heat exchange form (convection heat exchange) along the flow direction of the guide vanes when passing through the bottom of the lower shell. The heat dissipation of the motor is achieved through the outer circulation heat exchange mode, that is, cooling flow channels are designed on the lower shell, the middle shell, the upper shell and a sealing steel gasket, and a branch air inlet is newly designed at the air inlet of the compressor. After entering the branch air inlet of the compressor, the refrigerant enters the cooling flow channels of the segmented shell, and the heat of the motor stator is taken away through the cooling flow channels in a heat exchange form, so that the motor is cooled. The sealing steel gasket is newly designed in the segmented shell, and the opening position and the number of the sealing steel gasket have a direct influence on the air supplementing amount of the compressor, therefore, professional calculation and evaluation are needed. The outer circulation heat exchange cooling flow channel is finally the same as the fixed scroll, and a new air inlet (air supplementing inlet) is formed. According to calculation and experiment, under the condition that the air inlet amount is constant, several air inlets with the same area are less than multiple air inlets with small areas, that is, increasing the number of air inlets can directly help to improve the air inlet amount of the fixed scroll of the compressor and further improve the performance of the compressor. When the compressor works, the refrigerant enters the air inlet of the compressor and directly reaches the bottom of the lower shell. The other side of the bottom of the lower shell is the position where the IGBT is installed. The refrigerant enters the heat dissipation and cooling of the middle part (the bottom of the bearing seat) and the outer peripheral part (the area of the guide vanes) of the IGBT through the gap designed in the bottom of the bearing seat and the guide vanes. Two gaps are designed on the circumference of the bearing seat and used for the refrigerant entering the bottom of the bearing seat to directly flow out through the gap between the motor components. The guide vanes can effectively reduce the heat generated by the IGBT through three times of local acceleration and flow guiding when the refrigerant flows through the area of the guide vanes, so that the reliability of the IGBT is ensured. A refrigerant branch is additionally designed at the air inlet, and the branch is distributed outside the lower shell, the middle shell and the upper shell. The main purpose is that the refrigerant passes through the position of the motor stator, and the low temperature of the refrigerant takes away the heat of the motor stator in a convection heat exchange mode, so that the heat of the motor stator is reduced. The shells are sealed by the steel gasket, and the flow of the refrigerant can be controlled by the exhaust hole of the steel gasket, so that the flow is optimized. The refrigerant enters the upper shell through the air supplementing inlet, and the upper shell is designed with the same air inlet hole as the fixed scroll, so that a new cooling and pressurizing path in the compressor is completed.The air supplement path not only effectively cools the motor stator of the compressor, but also supplements air to the compressor, thereby forming a brand new independent air supplement path; the guide vane is further adopted to reduce the heat generated by the IGBT; an external circulation heat exchange mode is adopted to reduce the heat generated by the motor; a brand new refrigerant flow channel is formed, so that the overall temperature of the compressor is more stable; the sealing steel gasket with adjustable flow rate is adopted; the air inlet flow rate of the compressor is increased, and the performance of the compressor is improved; the heat radiation of the compressor shell to the outside is reduced; the split shell helps to improve the assembly process of the internal components; the structure has a significant effect on the heat dissipation and cooling of the controller part (motor + IGBT, etc.) of the large displacement compressor; and the problem that the electric scroll compressor has no active cooling measures is solved. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the present application or the prior art, the drawings needed to be used in the description of the present application or the prior art will be briefly introduced below.

[0009] Figure 1 is a front view of an electric scroll compressor external circulation cooling air supplement structure according to the present application.

[0010] Figure 2 is an A-A sectional view of an electric scroll compressor external circulation cooling air supplement structure according to the present application.

[0011] Figure 3 is a left view of an electric scroll compressor external circulation cooling air supplement structure according to the present application.

[0012] Figure 4 is a B-B sectional view of an electric scroll compressor external circulation cooling air supplement structure according to the present application.

[0013] Figure 5 is an A view of an electric scroll compressor external circulation cooling air supplement structure according to the present application.

[0014] Figure 6 is an A view of an electric scroll compressor external circulation cooling air supplement structure according to the present application, with the motor components being added or removed.

[0015] Figure 7 is a sealing steel gasket and shell external circulation air channel schematic diagram of an electric scroll compressor external circulation cooling air supplement structure according to the present application.

[0016] Figure 8 is a C-C sectional view of an electric scroll compressor external circulation cooling air supplement structure according to the present application.

[0017] 1 - lower housing, 2 - lower housing outer circulation airway, 3 - lower sealing steel gasket, 4 - middle housing outer circulation airway, 5 - middle housing, 6 - upper housing sealing steel gasket, 7 - upper housing outer circulation airway, 8 - upper housing, 9 - static disc, 10 - bolt, 11 - winding, 12 - stator circumferential mounting surface, 13 - stator, 14 - lower housing bottom surface, 15 - IGBT mounting surface, 16 - IGBT, 17 - compressor air inlet, 18 - air supplement hole, 19 - guide vane, 20 - plug, 21 - upper housing air outlet. DETAILED DESCRIPTION

[0018] Please refer to Figures 1-8 , Figure 1 is a front view of an external circulation cooling air supplement structure of an electric scroll compressor of the present application, Figure 2 is an A-A sectional view of an external circulation cooling air supplement structure of an electric scroll compressor of the present application, Figure 3 is a left view of an external circulation cooling air supplement structure of an electric scroll compressor of the present application, Figure 4 is a B-B sectional view of an external circulation cooling air supplement structure of an electric scroll compressor of the present application, Figure 5 is an A-direction view of an external circulation cooling air supplement structure of an electric scroll compressor of the present application, Figure 6 is an A-direction view of an external circulation cooling air supplement structure of an electric scroll compressor of the present application with motor components removed, Figure 7 is a sealing steel gasket and housing outer circulation airway schematic view of an external circulation cooling air supplement structure of an electric scroll compressor of the present application, Figure 8 is a C-C sectional view of an external circulation cooling air supplement structure of an electric scroll compressor of the present application,

[0019] An external circulation cooling air supplement structure of an electric scroll compressor of the present application includes a lower housing 1, a lower housing outer circulation airway 2, a lower sealing steel gasket 3, a middle housing outer circulation airway 4, a middle housing 5, an upper housing sealing steel gasket 6, an upper housing outer circulation airway 7, an upper housing 8, a static disc 9, a winding 11, a stator circumferential mounting surface 12, a stator 13, a lower housing bottom surface 14, an IGBT mounting surface 15, an IGBT 16, a compressor air inlet 17, an air supplement hole 18, a guide vane 19, a plug 20, an upper housing air outlet 21, and a bolt 10. The foregoing solution solves the problem of no active cooling measures for an electric scroll compressor.

[0020] For this specific embodiment, the lower shell external circulation air passage 2 is arranged on one side of the lower shell 1, the lower sealing steel gasket 3 is connected with the lower shell 1 and located on the side of the lower shell 1 close to the lower shell external circulation air passage 2, the middle shell external circulation air passage 4 is communicated with the lower shell external circulation air passage 2 and located on the side of the lower shell external circulation air passage 2, the middle shell 5 is connected with the lower shell 1 and located on the side of the lower shell 1, the upper shell sealing steel gasket 6 is connected with the middle shell 5 and located on the side of the middle shell 5, the upper shell external circulation air passage 7 is communicated with the middle shell external circulation air passage 4 and located on the side of the middle shell external circulation air passage 4, the upper shell 8 is arranged on the side of the upper shell external circulation air passage 7, the static disc 9 is arranged on the side of the upper shell 8, the winding 11 is arranged on the side of the lower shell 1, the stator circumferential mounting surface 12 is arranged on the side of the lower shell external circulation air passage 2, the stator 13 is connected with the stator circumferential mounting surface 12 and located on the side of the stator circumferential mounting surface 12, the lower shell bottom surface 14 is connected with the lower shell 1 and located on the side of the lower shell 1, the IGBT mounting surface 15 is arranged on the side of the lower shell 1, the IGBT 16 is connected with the IGBT mounting surface 15 and located on the side of the IGBT mounting surface 15 away from the lower shell 1, the compressor air inlet 17 is arranged on the side of the lower shell 1, the air supplement hole 18 is arranged on the side of the compressor air inlet 17, the guide vane 19 is arranged on the side of the lower shell 1, the plug 20 is connected with the upper shell 8 and located on the side of the upper shell 8, and the upper shell air outlet 21 is arranged on the side of the upper shell external circulation air passage 7.

[0021] In this embodiment, an IGBT 16 is installed on the other side of the bottom surface 15 of the compressor lower housing 14. The heat emitted by the IGBT 16 is conducted to the bottom surface 14 of the lower housing 1 through the bottom surface 15. The low-temperature refrigerant flows through the compressor inlet 17 and across the bottom surface 14 of the lower housing 1, carrying away the heat. Analysis suggests that a notch is made at the inlet corresponding to the bearing housing. The angle X of this notch relative to the compressor inlet should be between 45 and 55 degrees. This angle allows the refrigerant, after entering the bottom surface 14 of the housing, to enter the area where the heat is most concentrated in the IGBT 16 under the influence of pressure difference and inertia, thus carrying away a large amount of heat. Secondly, guide vanes 19 are designed at the position where the bottom surface 14 of the lower housing 1 connects to the bearing seat. The relative relationship of each guide vane 19 is Y, Z, S. In the analysis and experiment, it was found that when the opening between the guide vanes 19 is Y: (50-55 degrees), Z: (85-90 degrees), S: (26-32 degrees), the lengths M, P, and K of the guide vanes 19 need to be designed to be one long and one short. Under the guidance of the guide vanes 19, the refrigerant continuously exhibits local acceleration between the two vanes, which can improve the refrigerant flow of the lower housing 1. The bottom surface 14 has a high flow velocity throughout, thus carrying away the heat generated by the entire IGBT 16 area through heat exchange. Regarding comprehensive motor cooling, the motor windings 11 generate heat, which is transferred to the motor stator 13 via heat conduction. The refrigerant flows through the newly designed refrigerant flow channel on the lower housing 1. The length of the lower housing external circulation channel 2 must be greater than or equal to the length H of the motor stator 13. After passing through the lower housing external circulation channel 2 designed around the stator 13, the refrigerant exchanges heat with it, carrying away the heat generated by the stator 13, thus achieving the purpose of cooling. The lower sealing steel gasket 3 is used to seal the connection between the lower housing 1 and the middle housing 5. The lower sealing steel gasket 3 and the upper housing sealing steel gasket 6 can be structurally adjusted according to the actual state of the compressor to control flow rate, noise, etc. This is mainly reflected in the design of openings at different positions on the sealing steel gasket. Openings at different positions can change the refrigerant's movement path, speed, and noise. This method can also improve the strength of the sealing steel gasket. However, it should be noted that the closed sealing steel gasket area must ensure a passage area of ​​≥50% of the area of ​​the outer circulation channel of the housing to guarantee sufficient flow. The middle shell 5 and the upper shell 8 are respectively designed with the middle shell external circulation air passage 4 and the upper shell external circulation air passage 7. The two shells are sealed with the upper shell sealing steel gasket 6. The upper shell 8 is designed with an air outlet 21 and a plug 20, thus forming a complete external circulation air passage.The refrigerant enters the upper housing 8 through the lower, middle, and upper circulation channels and the sealing gaskets, then further passes through the outlet 21 and finally enters the inlet of the stationary plate 9 for compression and work, thus completing the gas supply function for the compressor. When the compressor is working, the refrigerant enters the inlet 17 and flows in two paths. One path enters the bottom 14 of the lower housing 1. Due to the bearing seat notch and guide vanes 19 designed in the bottom 14, the refrigerant passes through the area where the IGBT 16 heats up the most and the surrounding area under the action of the bearing seat notch and guide vanes 19. The refrigerant flow velocity is accelerated three times in this area, carrying away a large amount of high temperature to achieve the purpose of cooling. At the same time, the other path of refrigerant enters from the gas supply hole 18 into the external circulation channels 2, 4, 7 designed on the lower housing 1, middle housing 5, and upper housing 8, and enters the stationary plate 9 through the lower sealing gasket 3 and the upper housing sealing gasket 6, completing the purpose of heat dissipation for the motor stator 13 and the gas supply function for the compressor. The housing sealing gaskets 3 and 6 play an important role in regulating compressor performance and NVH (noise, vibration, and harshness). Analysis shows that... Figure 7 The enclosed area of ​​the housing sealing gasket in the views and other diagrams can achieve a high performance level. Generally speaking, the enclosed area of ​​the housing gasket should not exceed 70% of the total area; otherwise, NVH (Noise, Vibration, and Harshness) may deteriorate. According to experimental results, with the housing gasket at its maximum opening, compressor performance improved by 11.7%, while NVH remained comparable to the original state, significantly enhancing the compressor's overall competitiveness.

[0022] The bolt 10 is threadedly connected to the lower housing 1 and is located on one side of the lower housing 1.

[0023] In this embodiment, connecting lugs are designed on the lower shell 1 and the upper shell 8 respectively, and they are connected by long bolts 10. Since the connection of the split shell has high requirements for sealing, the torque of the bolts 10 needs to be confirmed by the maximum burst pressure in the compression chamber and taking into account a safety factor of 1.5.

[0024] The present invention discloses an external circulation cooling and gas supply structure for an electric scroll compressor. The lower housing external circulation duct 2 is located on one side of the lower housing 1. The lower sealing steel gasket 3 is connected to the lower housing 1 and located on the side of the lower housing 1 near the lower housing external circulation duct 2. The middle housing external circulation duct 4 communicates with the lower housing external circulation duct 2 and is located on one side of the lower housing external circulation duct 2. The middle housing 5 is connected to the lower housing 1 and is located on one side of the lower housing 1. The upper housing sealing steel gasket 6 is connected to the middle housing 5 and is located on one side of the middle housing 5. The upper housing external circulation duct 7 communicates with the middle housing external circulation duct 4 and is located on the side of the middle housing external circulation duct 4. The upper housing 8 is located on the side of the upper housing external circulation duct 7. The stationary disc 9 is located on one side of the upper housing 8. The winding 11 is located on the lower housing 1. On the side, the stator circumferential mounting surface 12 is disposed on the side of the lower housing external circulation air passage 2, the stator 13 is connected to the stator circumferential mounting surface 12 and is located on one side of the stator circumferential mounting surface 12, the bottom surface 14 of the lower housing is connected to the lower housing 1 and is located on one side of the lower housing 1, the IGBT mounting surface 15 is disposed on the side of the lower housing 1, the IGBT 16 is connected to the IGBT 15 mounting surface and is located on the side of the IGBT mounting surface 15 away from the lower housing 1, the compressor air inlet 17 is disposed on the side of the lower housing 1, the air replenishment hole 18 is disposed on one side of the compressor air inlet 17, the guide vane 19 is disposed on one side of the lower housing 1, the plug 20 is connected to the upper housing 8 and is located on one side of the upper housing 8, and the upper housing air outlet 21 is disposed on the side of the upper housing external circulation air passage 7.

[0025] In this embodiment, an IGBT 16 is installed on the other side of the bottom surface 15 of the compressor lower housing 14. The heat emitted by the IGBT 16 is conducted to the bottom surface 14 of the lower housing 1 through the bottom surface 15. The low-temperature refrigerant flows through the compressor inlet 17 and across the bottom surface 14 of the lower housing 1, carrying away the heat. Analysis suggests that a notch is made at the inlet corresponding to the bearing housing. The angle X of this notch relative to the compressor inlet should be between 45 and 55 degrees. This angle allows the refrigerant, after entering the bottom surface 14 of the housing, to enter the area where the heat is most concentrated in the IGBT 16 under the influence of pressure difference and inertia, thus carrying away a large amount of heat. Secondly, guide vanes 19 are designed at the position where the bottom surface 14 of the lower housing 1 connects to the bearing seat. The relative relationship of each guide vane 19 is Y, Z, S. In the analysis and experiment, it was found that when the opening between the guide vanes 19 is Y: (50-55 degrees), Z: (85-90 degrees), S: (26-32 degrees), the lengths M, P, and K of the guide vanes 19 need to be designed to be one long and one short. Under the guidance of the guide vanes 19, the refrigerant continuously exhibits local acceleration between the two vanes, which can improve the refrigerant flow of the lower housing 1. The bottom surface 14 has a high flow velocity throughout, thus carrying away the heat generated by the entire IGBT 16 area through heat exchange. Regarding comprehensive motor cooling, the motor windings 11 generate heat, which is transferred to the motor stator 13 via heat conduction. The refrigerant flows through the newly designed refrigerant flow channel on the lower housing 1. The length of the lower housing external circulation channel 2 must be greater than or equal to the length H of the motor stator 13. After passing through the lower housing external circulation channel 2 designed around the stator 13, the refrigerant exchanges heat with it, carrying away the heat generated by the stator 13, thus achieving the purpose of cooling. The lower sealing steel gasket 3 is used to seal the connection between the lower housing 1 and the middle housing 5. The lower sealing steel gasket 3 and the upper housing sealing steel gasket 6 can be structurally adjusted according to the actual state of the compressor to control flow rate, noise, etc. This is mainly reflected in the design of openings at different positions on the sealing steel gasket. Openings at different positions can change the refrigerant's movement path, speed, and noise. This method can also improve the strength of the sealing steel gasket. However, it should be noted that the closed sealing steel gasket area must ensure a passage area of ​​≥50% of the area of ​​the outer circulation channel of the housing to guarantee sufficient flow. The middle shell 5 and the upper shell 8 are respectively designed with the middle shell external circulation air passage 4 and the upper shell external circulation air passage 7. The two shells are sealed with the upper shell sealing steel gasket 6. The upper shell 8 is designed with an air outlet 21 and a plug 20, thus forming a complete external circulation air passage.The refrigerant enters the upper housing 8 through the lower, middle, and upper circulation channels and the sealing gaskets, then further passes through the outlet 21 and finally enters the inlet of the stationary plate 9 for compression and work, thus completing the gas supply function for the compressor. When the compressor is working, the refrigerant enters the inlet 17 and flows in two paths. One path enters the bottom 14 of the lower housing 1. Due to the bearing seat notch and guide vanes 19 designed in the bottom 14, the refrigerant passes through the area where the IGBT 16 heats up the most and the surrounding area under the action of the bearing seat notch and guide vanes 19. The refrigerant flow velocity is accelerated three times in this area, carrying away a large amount of high temperature to achieve the purpose of cooling. At the same time, the other path of refrigerant enters from the gas supply hole 18 into the external circulation channels 2, 4, 7 designed on the lower housing 1, middle housing 5, and upper housing 8, and enters the stationary plate 9 through the lower sealing gasket 3 and the upper housing sealing gasket 6, completing the purpose of heat dissipation for the motor stator 13 and the gas supply function for the compressor. The housing sealing gaskets 3 and 6 play an important role in regulating compressor performance and NVH (noise, vibration, and harshness). Analysis shows that... Figure 7 The enclosed area of ​​the housing sealing gasket in the views and other diagrams can achieve a high performance level. Generally speaking, the enclosed area of ​​the housing gasket should not exceed 70% of the total area; otherwise, NVH (Noise, Vibration, and Harshness) may deteriorate. According to experimental results, with the housing gasket at its maximum opening, compressor performance improved by 11.7%, while NVH remained comparable to the original state. The overall competitiveness of the compressor was significantly improved, thus solving the problem of the lack of active cooling measures in electric scroll compressors.

[0026] The above-disclosed inventions are merely one or more preferred inventions of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above inventions and equivalent variations made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. An external circulation cooling and gas supply structure for an electric scroll compressor, characterized in that, Includes the lower housing, lower housing external circulation air passage, lower sealing steel gasket, middle housing external circulation air passage, middle housing, upper housing sealing steel gasket, upper housing external circulation air passage, upper housing, stationary plate, winding, stator circumferential mounting surface, stator, lower housing bottom surface, IGBT mounting surface, IGBT, compressor inlet, air supply hole, guide vanes, plug and upper housing outlet; The lower housing external circulation duct is located on one side of the lower housing. The lower sealing steel gasket is connected to the lower housing and located on the side of the lower housing close to the lower housing external circulation duct. The middle housing external circulation duct communicates with the lower housing external circulation duct and is located on one side of the lower housing external circulation duct. The middle housing is connected to the lower housing and is located on one side of the lower housing. The upper housing sealing steel gasket is connected to the middle housing and is located on one side of the middle housing. The upper housing external circulation duct communicates with the middle housing external circulation duct and is located on the side of the middle housing external circulation duct. The upper housing is located on the side of the upper housing external circulation duct. The stator plate is located on one side of the upper housing. The winding is located on the side of the lower housing. The stator circumferential mounting surface is located on the lower housing external circulation duct. The stator is connected to the stator circumferential mounting surface and located on one side of the stator circumferential mounting surface. The bottom surface of the lower housing is connected to the lower housing and located on one side of the lower housing. The IGBT mounting surface is located on the side of the lower housing. The IGBT is connected to the IGBT mounting surface and located on the side of the IGBT mounting surface away from the lower housing. The compressor air inlet is located on the side of the lower housing. The air replenishment hole is located on one side of the compressor air inlet. The guide vane is located on one side of the lower housing. The plug is connected to the upper housing and located on one side of the upper housing. The upper housing air outlet is located on the side of the upper housing external circulation air passage. The upper housing external circulation air passage is connected to the stationary plate. The air replenishment hole is connected to the lower housing external circulation air passage. A guide vane is designed at the position where the bottom surface of the lower housing connects to the bearing housing. The relative relationship of each guide vane is Y, Z, S. When the opening between the guide vanes is Y: 50-55 degrees, Z: 85-90 degrees, S: 26-32 degrees, the lengths M, P, and K of the guide vanes are designed to be one long and one short. Under the guidance of the guide vane, the refrigerant continuously exhibits local acceleration between the two vanes, which can achieve a high flow velocity across the entire bottom surface of the lower housing, thereby carrying away the heat generated by the entire IGBT area in the form of heat exchange.

2. The external circulation cooling and gas supply structure for an electric scroll compressor as described in claim 1, characterized in that, The external circulation cooling and gas replenishment structure of the electric scroll compressor also includes bolts, which are threadedly connected to the lower housing and located on one side of the lower housing.

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