Electrically driven compressor

Abstract

The occurrence of resonance in the inverter housing during operation of the electrically driven compressor is suppressed. The electrically driven compressor 1 is equipped with: an electric motor 4, a compression mechanism 5 driven by the electric motor 4, an inverter 6 for driving the electric motor 4, a motor housing 20 for receiving the electric motor 4, and an inverter housing 7, which is attached to and fixed against the motor housing 20 and also receives the inverter 6. The motor housing 20 has a tubular main body section 24 and a first projecting section 41, which is provided on the outer circumferential surface of the main body section 24.The inverter housing 7 has an end wall 30, wherein the outer surface 30a of the end wall 30 comprises a section 30a1, which abuts an end face (a front end face 24a) of the main body section 24, and an exposed section 30a2, which is open to the outside. A second projecting section 42 is provided on the exposed section 30a2 of the outer surface 30a of the end wall 30. The first projecting section 41 is fixed directly or indirectly to the second projecting section 42.

Description

TECHNICAL AREA The present invention relates to an electrically driven compressor. STATE OF THE ART Most electrically driven compressors used to compress refrigerants in vehicle air conditioning systems have an electric motor to drive a compression mechanism and an inverter. The electric motor is driven by converting the direct current from an on-board battery into alternating current via an inverter and controlling the current supply to the electric motor. In this respect, patent document 1 discloses that a motor housing containing an electric motor and an inverter housing containing an inverter are butted together on both sides in the axial direction of an electrically driven compressor. LIST OF REFERENCE DOCUMENTS PATENT DOCUMENTS Patent document 1: JP 2022-138248 A BRIEF SUMMARY OF THE INVENTION TASKS OF INVENTION In recent years, electric vehicles have been equipped with increasingly higher voltages. Consequently, the electronic circuit boards of the inverters have become larger to ensure sufficient insulation distances at high voltages, and as a result, the inverter housings have also become larger. Therefore, the inverter housing, viewed along the axis of the electrically driven compressor, protrudes significantly beyond the contour of the motor housing. This protruding section of the inverter housing exhibits low flexural strength and a low natural frequency, creating a risk of resonance during operation of the electrically driven compressor. This resonance can lead to damage to the inverter. The present invention therefore aims to suppress the occurrence of resonance in the inverter housing during operation of the electrically driven compressor. SOLUTION OF THE TASKS According to one aspect of the present invention, an electrically driven compressor is provided. This electrically driven compressor is equipped with: an electric motor, a compression mechanism driven by the electric motor, an inverter for driving the electric motor, a motor housing for receiving the electric motor, and an inverter housing that is attached to and fixed against the motor housing and accommodates the inverter. The motor housing has a tubular main body section and a first projecting section provided on the outer circumferential surface of the main body section. The inverter housing has an end wall. The outer circumferential surface of the end wall comprises a contact section that abuts an end face of the main body section and an exposed section that is open to the outside.A second projecting section is provided on the exposed portion of the outer surface of the end wall. The first projecting section is fixed directly or indirectly to the second projecting section. EFFECTS OF THE INVENTION According to the present invention, the occurrence of resonance in the inverter housing during operation of the electrically driven compressor can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a schematic longitudinal sectional view of an electrically driven compressor in a first embodiment of the present invention. Fig. 2 shows an AA arrow view of Fig. 1. Fig. 3 shows a front view of the electrically driven compressor in the first embodiment. Fig. 4 shows a bottom view of the electrically driven compressor in the first embodiment. Fig. 5 shows a front view of a motor housing in the first embodiment. Fig. 6 shows a perspective view of a coupling element in the first embodiment of the present invention. Fig. 7 shows a perspective view of the coupling element in a second embodiment of the present invention. Fig. 8 shows a perspective view of the coupling element in a third embodiment of the present invention. Fig. 9 shows a perspective view of the coupling element in a fourth embodiment of the present invention.Figure 10 shows a rear view of the coupling element's mounting in the fourth embodiment. Figure 11 shows a bottom view of the coupling element's mounting in the fourth embodiment. Figure 12 shows a view illustrating the function of the anti-rotation device for the coupling element in the fourth embodiment. Figure 13 shows a perspective longitudinal sectional view of the electrically driven compressor in a fifth embodiment of the present invention. Figure 14 shows a BB arrow view of Figure 13. Figure 15 shows a bottom view of the electrically driven compressor in the fifth embodiment. Figure 16 shows a view illustrating a modified example of the electrically driven compressor in the fifth embodiment. Figure 17 shows a left side view of the electrically driven compressor in a sixth embodiment of the present invention.Figure 18 shows a schematic longitudinal section view of the electrically driven compressor in the sixth embodiment. Figure 19 shows a cross-sectional arrow view of Figures 17 and 18. Figure 20 shows a front view of the electrically driven compressor in the sixth embodiment. Figure 21 shows a front view of the motor housing in the sixth embodiment. Figure 22 shows a modified example of the electrically driven compressor in the sixth embodiment. DESCRIPTION OF THE EXECUTION FORMS The embodiments of the present invention are explained below with reference to the accompanying drawings. Fig. 1 shows a schematic longitudinal sectional view of the electrically driven compressor 1 in the first embodiment of the present invention. Fig. 2 shows an AA arrow view of Fig. 1. Figs. 3 and 4 each show a front view and a bottom view of the electrically driven compressor 1. Fig. 5 shows a front view of the motor housing 20. In Fig. 2, the representation of the components inside the motor housing 20 has been omitted for the sake of simplicity. For convenience, the front and rear sides, the left and right sides, and the top and bottom sides of the electrically driven compressor 1 are defined and explained below as shown in Figs. 1 and 2. The electrically driven compressor 1 can, for example, be installed in a vehicle and form part of the refrigerant circuit of a vehicle air conditioning system, and can be designed to compress and convey a refrigerant (in the present embodiment, a gaseous refrigerant). The electrically driven compressor 1 comprises: a housing 2, a rotating shaft 3, an electric motor 4 for rotating the rotating shaft 3, a compression mechanism 5 driven by the rotating shaft 3 and which compresses the refrigerant, an inverter 6 for driving the electric motor 4, and an inverter housing 7. The rotating shaft 3, the electric motor 4, and the compression mechanism 5 are housed in the housing 2. The electric motor 4 and the compression mechanism 5 are arranged in series within the housing 2 along the axis of the rotating shaft 3 (axis of the electrically driven compressor 1). The inverter 6 is housed in the inverter housing 7. In the present embodiment, the electrically driven compressor 1 is an electrically driven scroll compressor and the compression mechanism 5 is a scroll compression mechanism. The compression mechanism 5 comprises a fixed scroll 8 and a scroll 9 that pivots relative to the fixed scroll 8 (movable scroll). The fixed scroll 8 and the pivoting scroll 9 are arranged opposite each other in the axial direction of the electric compressor 1. The pivoting spiral 9 is designed such that it is driven by the rotating shaft 3 via a crank mechanism 10 and pivots relative to the fixed spiral 8, i.e., revolves around the axis of the fixed spiral 8. The crank mechanism 10 is designed to couple the rotating shaft 3 with the pivoting spiral 9 and to convert the rotary motion of the rotating shaft 3 into a pivoting motion of the pivoting spiral 9. The compression mechanism 5 is designed to draw in and compress a low-pressure refrigerant by means of the pivoting motion of the pivoting spiral 9 relative to the fixed spiral 8. The housing 2 is made of metal, for example. The housing 2 comprises a motor housing 20, also referred to as the front housing, and a rear housing 21. The motor housing 20 (hereinafter referred to as the main body section 24) accommodates the rotating shaft 3 and the electric motor 4. The rear housing 21 (hereinafter referred to as the front tubular section 25) accommodates the compression mechanism 5. The housing 2 is formed by butt-fitting the rear end face (hereinafter referred to as the rear end face 24b) of the motor housing 20 and the front end face (hereinafter referred to as the front end face 25a) of the rear housing 21 by means of tightening elements, the illustration of which is omitted. The main body section 24 of the motor housing 20 is a longitudinally extending (horizontally) tubular shape, in the present embodiment in particular a round tubular shape. The main body section 24 is closed at its front end face (one end face) 24a and open at its rear end face (the other end face) 24b. The rear housing 21 is tubular and consists of two stages: a front stage and a rear stage. The rear housing 21 has a front tubular section 25 in a round shape, the outer diameter of which corresponds to the outer diameter of the main body section 24 of the engine housing 20, and a rear tubular section 26 in a round shape, the outer diameter of which is smaller than that of the front tubular section 25. The front end face 25a of the front tubular section 25 is open. The rear end face 26b of the rear tubular section 26 is closed. The front tubular section 25 and the rear tubular section 26 can also be composed of different components. The electric motor 4 consists, for example, of a three-phase synchronous motor (brushless DC motor) and comprises a stator core unit 13 and a rotor 14. The stator core unit 13 is fixed to the inner circumferential surface of the main body section 24 of the motor housing 20. The stator core unit 13 is supplied with direct current, which is converted into three-phase alternating current by the inverter 6 from an on-board battery (not shown). The rotor 14 is arranged within the stator core unit 13 with a predetermined radial gap. Permanent magnets (not shown) are integrated into the rotor 14. The rotor 14 is formed in a round, tubular shape and is connected to the rotating shaft 3, which passes through its cavity. That is, the rotor 14 is integrated with the rotating shaft 3. When a magnetic field is generated in the stator core unit 13 by the power supply from the inverter 6, a rotational force acts on the permanent magnets of the rotor 14 in the electric motor 4 and the rotor 14 rotates, which rotates the rotating shaft 3. In the upper part of the main body section 24 of the motor housing 20, an inlet channel P1 is formed adjacent to the front end face 24a. The inlet channel P1 is connected to the (low-pressure side) of the refrigerant circuit via a connecting line (not shown) etc. As shown in Fig. 1, the electrically driven compressor 1 in the present embodiment comprises an inlet chamber H1 into which the low-pressure refrigerant flows, a compression chamber H2 in which the low-pressure refrigerant is compressed, and a delivery chamber H3 from which the refrigerant compressed in the compression chamber H2 is delivered. The inlet chamber H1 is separated by the main body section 24 of the engine housing 20. A low-pressure refrigerant from the refrigerant circuit flows into the inlet chamber H1 via the inlet channel P1. The low-pressure refrigerant in the inlet chamber H1 passes through a refrigerant channel L1 into a chamber H4 near the compression mechanism 5. The compression chamber H2 is formed within the compression mechanism 5, i.e., between the fixed spiral 8 and the pivoting spiral 9. The compression mechanism 5 is designed such that, during the formation of the compression chamber H2, it draws in the low-pressure refrigerant from space H4 and compresses this low-pressure refrigerant. The delivery chamber H3 is located in the rear tubular section 26 of the rear housing 21. A delivery bore L2 is formed on a support 8a of the fixed spiral 8, allowing communication between the compression chamber H2 and the delivery chamber H3. Therefore, the refrigerant compressed in the compression chamber H2 of the compression mechanism 5 is conveyed to the delivery chamber H3 via the delivery bore L2. A check valve 15, for example a diaphragm valve, is attached to the side of the support 8a of the fixed spiral 8 facing the delivery chamber H3. This check valve allows the flow of refrigerant from the compression chamber H2 to the delivery chamber H3, but restricts the flow of refrigerant from the delivery chamber H3 to the compression chamber H2. An oil separator 16 is arranged in the delivery chamber H3, separating the lubricating oil contained in the refrigerant (gaseous refrigerant). A delivery channel P2 is formed in the upper part of the rear tubular section 26 of the rear housing 21, which communicates with the delivery chamber H3 (oil separator 16). The delivery channel P2 is connected to the high-pressure side of the refrigerant circuit via a connecting line (not shown). Therefore, the refrigerant flowing into the delivery chamber H3 is separated from the lubricating oil by the oil separator 16 and then discharged by the delivery channel P2 to the high-pressure side of the refrigerant circuit. Consequently, the low-pressure refrigerant flows from the refrigerant circuit through inlet channel P1 into inlet chamber H1, passes through the gap of the electric motor 4, and is then routed through refrigerant channel L1 into chamber H4 near the compression mechanism 5. The low-pressure refrigerant in chamber H4 is forced into compression chamber H2 of the compression mechanism 5 by the pivoting motion of the pivoting spiral 9 and compressed. The refrigerant compressed in compression chamber H2 is conveyed through delivery bore L2 (and the check valve 15) into delivery chamber H3, where the lubricating oil is separated in oil separator 16. The refrigerant separated from the lubricating oil in oil separator 16 is then discharged into the refrigerant circuit via delivery channel P2. Here, the front end face 24a of the main body section 24 of the motor housing 20 and the electric motor 4 (stator core unit 13 and rotor 14) can be cooled by the cold refrigerant flowing into the inlet chamber H1 via the inlet channel P1. Furthermore, the compression mechanism 5, driven by the electric motor 4, is designed to compress and convey the refrigerant introduced from the inlet channel P1 into the main body section 24 of the motor housing 20 (into the inlet chamber H1). In the present embodiment, one or more nose sections 27 are provided on the upper part of the housing 2 (either on at least one of the upper parts of the engine housing 20 or the upper part of the rear housing 21). These nose sections 27 can be used to fix the housing 2 to a vehicle. The nose sections 27 project upwards from the upper part of the housing 2 (from at least one of the upper parts of the engine housing 20 and the upper part of the rear housing 21). The nose sections 27 can be, for example, cuboid (prismatic) or cylindrical. The inverter housing 7 is made of metal, for example. The inverter housing 7 is positioned in front of the main body section 24 of the motor housing 20. The inverter housing 7 is placed against the main body section 24 of the motor housing 20 and secured. The inverter housing 7 has an end wall (bottom wall) 30 and a circumferential wall 31, which rises upwards from the circumference of the end wall 30 and defines an opening opposite the end wall 30. In the present embodiment, the inverter housing 7 is a rectangular box extending vertically, with the rear end of the inverter housing 7 being formed by the end wall 30. An inverter cover 32 is attached to the front end of the inverter housing 7 for closing / removing the opening. Several bolts 33 (twelve in the present embodiment) are used to fix this inverter cover 32 to the inverter housing 7. Viewed in the axial direction of the electrically driven compressor 1, the inverter housing 7 projects upwards, downwards, left and right beyond the contour of the main body section 24 of the motor housing 20. In particular, in the present embodiment, the inverter housing 7 projects far downwards beyond the contour of the main body section 24 of the motor housing 20 when viewed in the axial direction of the electrically driven compressor 1. The outer surface 30a of the end wall 30 of the inverter housing 7 consists of a system section 30a1, which abuts the front end surface 24a of the main body section 24 of the motor housing 20, and an exposed section 30a2, which is exposed to the outside. The inverter 6, housed in the inverter casing 7, has several (in the present embodiment six) switching elements (power switching elements) 35 and a control board 36 on which a control circuit for controlling the switching elements 35 is implemented. The control board 36 is arranged in the inverter casing 7 in a position away from the end wall 30 towards the opening. The control board 36 is fixed to the inverter casing 7 by fastening elements (not shown). The switching elements 35 are arranged on the inner surface 30b of the end wall 30 of the inverter casing 7 in a portion adjacent to the system section 30a1 (in other words, a portion adjacent to the front end face 24a of the main body section 24). To fix the inverter housing 7 to the main body section 24 of the motor housing 20, several (eight in the present embodiment) first bolts 51 are used. For this purpose, several (eight in the present embodiment) through-holes 38 are formed in the end wall 30 of the inverter housing 7 for inserting the externally threaded sections of the first bolts 51. Furthermore, several (eight in the present embodiment) internally threaded sections 24c are formed in the main body section 24 (the front end face 24a) of the motor housing 20, into which the externally threaded sections of the first bolts 51 are screwed. Therefore, the first bolts 51 are screwed in from the inside of the inverter housing 7. In this process, the bolts 33 described above and the first bolts 51 are both screwed in from front to back (i.e., in the same direction).In the present embodiment, several (eight in the present embodiment) first bolts 51 are arranged at intervals from one another along the circumferential direction of the main body section 24. In the present embodiment, one or more lug sections 39 are provided on the upper part of the inverter housing 7. These lug sections 39 can be used to fix the inverter housing 7 to the vehicle. The lug sections 39 project upwards from the upper part of the inverter housing 7. The lug sections 39 can be, for example, cuboid or cylindrical. In the present embodiment, the inverter housing 7, viewed in the axial direction of the electrically driven compressor 1, projects far downwards beyond the contour of the main body section 24 of the motor housing 20. Therefore, the inverter housing 7 is in a so-called cantilevered state. To reduce this cantilevered state, in the present embodiment the motor housing 20 and the inverter housing 7 each have a first projecting section 41 and a second projecting section 42. The first projecting section 41 is located at the lower end of the outer circumferential surface of the main body section 24 of the motor housing 20 and projects downwards from this lower end. That is, the first projecting section 41 projects radially outwards from the outer circumferential surface of the main body section 24 of the motor housing 20. The second projecting section 42 is located at the exposed end 30a2 of the outer surface 30a of the end wall 30 of the inverter housing 7 at a height below the first projecting section 41 and projects rearwards from this position. In the present embodiment, the first projecting section 41 and the second projecting section 42 are each cuboid in shape, but can also be cylindrical. In the present embodiment, the first projection section 41 is indirectly fixed to the second projection section 42 via a coupling element 100. The coupling element 100 is explained here with reference to Fig. 6, in addition to the preceding Figs. 1, 2, 3, 4 to 5. Fig. 6 shows a perspective view of the coupling element 100. The coupling element 100 comprises a rectangular, plate-shaped main section 101 extending in one direction, a rectangular, plate-shaped first fastening section 111 formed at one end of the main section 101, and a rectangular, plate-shaped second fastening section 112 formed at the other end of the main section 101. In the present embodiment, the main section 101, the first fastening section 111, and the second fastening section 112 can be formed, for example, by bending a metal plate. The first fastening section 111 is in surface contact with the lower end face of the first projecting section 41. A bolt 121 is used to fix the first fastening section 111 to the first projecting section 41. For this purpose, a through-hole 113 is formed in the first fastening section 111 for inserting the externally threaded section of the bolt 121. An internally threaded section 43 is formed on the first projecting section 41, into which the externally threaded section of the bolt 121 is screwed. The second fastening section 112 is in surface contact with the rear end face of the second projecting section 42. A bolt 122 is used to fix the second fastening section 112 to the second projecting section 42. For this purpose, a through-hole 114 is formed in the second fastening section 112 for inserting the externally threaded section of the bolt 122. An internally threaded section 44 is formed on the second projecting section 42, into which the externally threaded section of the bolt 122 is screwed. In the present embodiment, the second projection section 42 is preferably arranged in a position as far downwards as possible from the first projection section 41, in order to reduce the previously described unsupported state of the inverter housing 7. Furthermore, it is self-evident that, for the use of multiple coupling elements 100, the first projection section 41 and the second projection section 42 can be provided for each coupling element 100. That is, the electrically driven compressor 1 can be equipped with multiple coupling elements 100, as well as multiple first projection sections 41 and multiple second projection sections 42. According to the present embodiment, the electrically driven compressor 1 is provided with the electric motor 4, the compression mechanism 5, which is driven by the electric motor 4, the inverter 6 for driving the electric motor 4, the motor housing 20 for receiving the electric motor 4, and the inverter housing 7, which is fixed to the motor housing 20 and receives the inverter 6. The motor housing 20 has the tubular main body section 24 and the first projecting section 41, which is provided on the outer circumferential surface of the main body section 24. The inverter housing 7 has the end wall 30, wherein the outer surface 30a of the end wall 30 comprises the contact section 30a1, which abuts the front end face 24a (an end face) of the main body section 24, and the externally exposed section 30a2. The second projection section 42 is provided on the exposed section 30a2 of the outer surface 30a of the end wall 30.The first projection section 41 is indirectly fixed to the second projection section 42 via the coupling element 100. This suppresses the occurrence of resonance in the inverter housing 7 during operation of the electrically driven compressor 1. It is preferred that at least one of the first projection section 41 and the second projection section 42 is cuboid or cylindrical. Furthermore, according to the present embodiment, the coupling element 100 comprises the first fastening section 111, which is in surface contact with the first projecting section 41, and the second fastening section 112, which is in surface contact with the second projecting section 42. The first fastening section 111 is fixed to the first projecting section 41. The second fastening section 112 is fixed to the second projecting section 42. This allows the coupling element 100 to be designed with a simple form. According to the present embodiment, the inlet channel P1 is formed on the front end face 24a (one of the end faces) of the main body section 24. The compression mechanism 5 is designed to compress and convey the refrigerant introduced into the main body section 24 through the inlet channel P1. The switching elements 35, which form the inverter 6, are provided on the portion of the inner surface 30b of the end wall 30 adjacent to the system section 30a1. Therefore, the switching elements 35 can be cooled by the cold, low-pressure refrigerant flowing into the main body section 24 via the inlet channel P1, through the front end face 24a of the main body section 24 and the end wall 30 of the inverter housing 7. Furthermore, according to the present embodiment, the electrically driven compressor 1 is installed in a vehicle. The main body section 24 extends horizontally. The inverter housing 7 extends vertically. Nose sections 39 for fixing the inverter housing 7 to the vehicle are provided on its upper part. The inverter housing 7 projects downwards beyond the main body section 24. The first projection section 41 is located at the lower end of the outer circumferential surface of the main body section 24. The second projection section 42 is located on the exposed section 30a2 of the outer surface 30a of the end wall 30, at a height below the first projection section 41. This reduces the previously described cantilevered state of the inverter housing 7.In this case, the main body section 24 assumes a round tube shape and the first projection section 41 extends radially outwards from the outer circumferential surface of the main body section 24. Next, the second embodiment of the present invention will be explained with reference to Fig. 7. Fig. 7 shows a perspective view of the coupling element 100 in the present embodiment. The differences from the first embodiment described above are explained. In the present embodiment, the coupling element 100 additionally comprises a pair of left and right reinforcing sections 102. Each reinforcing section 102 is arranged on the inside of the bend of the coupling element 100 (the main section 101, the first fastening section 111, and the second fastening section 112) to suppress deformation of the bent coupling element 100 (the main section 101, the first fastening section 111, and the second fastening section 112). The reinforcing sections 102 are arranged upright at the left and right edges of each of the main section 101, the first fastening section 111, and the second fastening section 112 that comprise the coupling element 100. In particular, the coupling element 100 according to the present embodiment comprises the pair of left and right reinforcing sections 102. This increases the strength of the coupling element 100 and thus further suppresses the occurrence of resonance in the inverter housing 7 during operation of the electrically driven compressor 1. Next, the third embodiment of the present invention will be explained with reference to Fig. 8. Fig. 8 shows a perspective view of the coupling element 100' in the present embodiment. The differences from the first embodiment described above are explained. In the coupling element 100' of the present embodiment, the previously described main section 101 is omitted, and the first fastening section 111 and the second fastening section 112 are formed, for example, by bending a single metal plate at a right angle. At the connection point between the first fastening section 111 and the second fastening section 112, i.e., at the corner, a pair of left and right reinforcing sections 102' is provided. Each reinforcing section 102' is fixed to the previously described corner by welding or the like in order to suppress deformation of the right-angle bent coupling element 100 (the first fastening section 111 and the second fastening section 112). In particular, the coupling element 100' according to the present embodiment comprises the pair of left and right reinforcing sections 102'. This increases the strength of the coupling element 100' and thus further suppresses the occurrence of resonance in the inverter housing 7 during operation of the electrically driven compressor 1. Next, the fourth embodiment of the present invention will be explained with reference to Figures 9, 10, 11 to 12. Figure 9 shows an oblique view of the coupling element 100” in the present embodiment. Figure 10 shows a rear view of the mounting of the coupling element 100” in the present embodiment. Figure 11 shows a bottom view of the mounting of the coupling element 100” in the present embodiment. Figure 12 shows a view illustrating the function of the anti-rotation device of the coupling element 100” in the present embodiment. Figure 10 corresponds to Figure 2 described above. The differences from the first embodiment described above are explained. In the coupling element 100” in the present embodiment, a rectangular, plate-shaped extension section 111a is provided on the first fastening section 111 of the previously described coupling element 100. This extension section 111a is in surface contact with the left surface of the first projecting section 41. The extension section 111a of the first fastening section 111 has a through-hole 113' for inserting the externally threaded section of the bolt 121. The first projecting section 41 has an internally threaded section (not shown) into which the externally threaded section of the bolt 121 is screwed. In the present embodiment, bolt 121 is screwed in from left to right. Bolt 122, on the other hand, is screwed in from back to front. In this respect, Fig. 12 shows the screw-in direction D1 of bolt 121, the direction of rotation R1 of bolt 121 when screwing in bolt 121, the screw-in direction D2 of bolt 122, and the direction of rotation R2 of bolt 122 when screwing in bolt 122. When the bolt 121 is screwed in in the screw-in direction D1 (i.e., from left to right), the bolt 121 rotates clockwise (along the direction of rotation R1). The coupling element 100" also attempts to rotate clockwise (along the direction of rotation R1), but this rotation is prevented by the second fastening section 112, which is in surface contact with the second projecting section 42. That is, the second fastening section 112 acts as an anti-rotation device, suppressing the rotation of the coupling element 100" relative to the first projecting section 41 when the bolt 121 is tightened. If, however, the bolt 122 is screwed in in the screw-in direction D2 (i.e., from back to front), the bolt 122 rotates clockwise (along the direction of rotation R2). Consequently, the coupling element 100" also attempts to rotate clockwise (along the direction of rotation R2), but this rotation is prevented by the extension section 111a of the first fastening section 111, which is in surface contact with the first projecting section 41. That is, the extension 111a of the first fastening section 111 acts as an anti-rotation device, suppressing the rotation of the coupling element 100" relative to the second projecting section 42 when the bolt 122 is tightened. In particular, according to the present embodiment, the first fastening section 111 (extension section 111a) is fixed to the first projection section 41, and the second fastening section 112 is fixed to the second projection section 42, each by tightening the bolts 121 and 122. The first fastening section 111 (extension section 111a) and the second fastening section 112 are each designed such that, when the bolts 121 and 122 are tightened, they act as anti-rotation devices, preventing the coupling element 100” from rotating relative to the first projection section 41 and the second projection section 42. This allows for efficient assembly of the coupling element 100”. Next, the fifth embodiment of the present invention will be explained with reference to Figures 13, 14 to 15. Figure 13 shows a schematic longitudinal sectional view of the electrically driven compressor 1 in the present embodiment. Figure 14 shows a BB arrow view of Figure 13. Figure 15 shows a bottom view of the electrically driven compressor 1 in the present embodiment. In Figure 13, as in Figure 2, the components in the motor housing 20 have been omitted for the sake of simplicity. The differences from the first embodiment described above are explained. In the present embodiment, the second projecting section 42 is arranged on the exposed part 30a2 on the outer surface 30a of the end wall 30 of the inverter housing 7 at the same height as the first projecting section 41 and extends rearward from this position. The front end face of the first projecting section 41 rests against the rear end face of the second projecting section 42, and in this state, the first projecting section 41 is directly fixed to the second projecting section 42 by bolts 123. For this purpose, a through-hole 115 is formed in the first projecting section 41 for inserting the externally threaded section of the bolt 123. Furthermore, an internally threaded section 116 is formed in the second projecting section 42, into which the externally threaded section of the bolt 123 is screwed. Therefore, the bolt 123 is screwed in from back to front. In particular, according to the present embodiment, the first projecting section 41 abuts the second projecting section 42. The first projecting section 41 is further secured directly to the second projecting section 42 by the bolt 123. This eliminates the need for the aforementioned coupling elements 100, 100' and 100"". Fig. 16 shows a modified example of the electrically driven compressor 1 of the present embodiment. In this modified example, a through-hole 115' for inserting the external threaded section of the bolt 123 is formed on the end wall 30 and the second projecting section 42 of the inverter housing 7. Furthermore, an internal threaded section 116' is formed on the first projecting section 41, into which the external threaded section of the bolt 123 is screwed. Therefore, the bolt 123 is screwed in from the inside of the inverter housing 7. As already mentioned, the first bolt 51 is also screwed in from the inside of the inverter housing 7. Moreover, both the bolt 123 and the first bolt 51 are screwed in from front to back (i.e., in the same direction). Consequently, screwing in the bolt 123 and the first bolt 51 can be carried out in a single operation. The following are examples of clauses that can be derived from the first to fifth embodiments and their modified examples described above. [Clause 1] Electrically driven compressor, equipped with: an electric motor, a compression mechanism driven by the electric motor, an inverter for driving the electric motor, a motor housing for receiving the electric motor, and an inverter housing which is attached to and fixed against the motor housing and which receives the inverter, wherein the motor housing has a tubular main body section and a first projecting section provided on the outer circumferential surface of the main body section, the inverter housing has an end wall, the outer circumferential surface of the end wall comprises a contact section which abuts an end face of the main body section and an exposed section which is exposed to the outside, a second projecting section is provided on the exposed section of the outer surface of the end wall, and the first projecting section is fixed directly or indirectly to the second projecting section. [Clause 2] Electrically driven compressor according to clause 1, wherein the first projection section abuts the second projection section, and the first projection section is fixed directly to the second projection section by bolts. [Clause 3] Electrically driven compressor according to clause 1, wherein the first projection section is indirectly fixed to the second projection section via a coupling element. [Clause 4] Electrically driven compressor according to clause 3, wherein the coupling element comprises a first fastening section which is in surface contact with the first projection section and a second fastening section which is in surface contact with the second projection section, wherein the first fastening section is fixed to the first projection section and the second fastening section is fixed to the second projection section. [Clause 5] Electrically driven compressor according to clause 4 wherein the fixing of the first fastening section to the first projection section and the fixing of the second fastening section to the second projection section are each carried out by tightening bolts, wherein the first fastening section and the second fastening section are each designed to act as anti-rotation devices which suppress rotation of the coupling element relative to the first projection section and second projection section when tightening the bolts. [Clause 6] Electrically driven compressor according to clause 4 or 5, wherein the coupling element additionally comprises a boosting section. [Clause 7] Electrically driven compressor according to one of clauses 1 to 6, wherein an inlet channel is formed on the main body section adjacent to the end face, the compression mechanism is designed to compress and convey a refrigerant introduced into the main body section through the inlet channel, and switching elements are provided on the part of the inner surface of the end wall adjacent to the system section, which form the inverter. [Clause 8] Electrically driven compressor according to one of clauses 1 to 7, wherein the electrically driven compressor is installed in a vehicle, the main body section extends in a horizontal direction, the inverter housing extends in a vertical direction, nose sections are provided on the upper part of the inverter housing for fixing it to the vehicle, and the inverter housing extends downwards beyond the main body section. [Clause 9] Electrically driven compressor according to clause 8, wherein the first projection section is provided at the lower end of the outer circumferential surface of the main body section, and the second projection section is provided on the exposed section of the outer surface of the end wall at the same height as the first projection section or at a height below the first projection section. [Clause 10] Electrically driven compressor according to one of clauses 1 to 9, wherein the main body section assumes a round tube shape, and the first projection section extends radially outwards from the outer circumferential surface of the main body section. [Clause 11] Electrically driven compressor according to one of clauses 1 to 10, wherein at least one of the first and second projection sections is cuboid or cylindrical. The sixth embodiment of the present invention will now be explained with reference to Figures 17, 18, 19, 20 to 21. Figure 17 shows a left side view of the electrically driven compressor 1 in the present embodiment. Figure 18 shows a schematic longitudinal section view of the electrically driven compressor 1 in the present embodiment. Figure 19 shows a cross-sectional arrow view of Figures 17 and 18. Figure 20 shows a front view of the electrically driven compressor 1 in the present embodiment. Figure 21 shows a front view of the motor housing 20 in the present embodiment. Figure 17 also shows a partial sectional view at the mounting point of the second bolt 52, which will be described later. In Figure 19, as in Figure 2, the representation of the components in the motor housing 20 has been omitted for the sake of simplicity.The differences from the first embodiment described above are explained. In the present embodiment, the previously described first projection section 41 and the second projection section 42 are omitted. Furthermore, the motor housing 20 has a flange section 130 in addition to the previously described main body section 24. The flange section 130 is formed on the front end face (one of the end faces) 24a of the main body section 24. The flange section 130 projects radially outwards beyond the front end face 24a of the main body section 24. Viewed in the axial direction of the electrically driven compressor 1, the flange section 130 has a square contour that surrounds the outer circumferential surface of the main body section 24. Viewed in the axial direction of the electrically driven compressor 1, it is preferred that the outer circumferential surface of the main body section 24 is inscribed within the square contour of the flange section 130.This allows the protruding part of the flange section 130 to be reduced to a minimum from the outer circumferential surface of the main body section 24. In the present embodiment, the front end face 24a of the main body section 24 of the motor housing 20 and the flange section 130 abut the outer surface 30a of the end wall 30 of the inverter housing 7. In the present embodiment, the inverter housing 7, viewed in the axial direction of the electrically driven compressor 1, projects upwards, downwards, left and right beyond the contour of the flange section 130 of the motor housing 20. In the present embodiment, several (four in the present embodiment) second bolts 52 are used to fix the inverter housing 7 to the flange section 130 of the motor housing 20. For this purpose, several (four in the present embodiment) through-holes 38' are formed in the end wall 30 of the inverter housing 7, into which the external threaded sections of the second bolts 52 can be inserted. Furthermore, several (four in the present embodiment) internal threaded sections 131 are formed in the flange section 130 of the motor housing 20, into which the external threaded sections of the second bolts 52 are screwed. Therefore, the second bolts 52 are screwed in from the inside of the inverter housing 7. As already mentioned, the first bolt 51 is also screwed in from the inside of the inverter housing 7. Furthermore, both the first bolt 51 and the second bolt 52 are screwed in from front to back (i.e., from front to back).(in the same direction). Therefore, the insertion of the first bolt 51 and the insertion of the second bolt 52 can be carried out in a single operation. In the present embodiment, the second bolts 52 are each arranged at the four corners of the square flange section 130. In particular, according to the present embodiment, the electrically driven compressor 1 is equipped with: the electric motor 4, the compression mechanism 5 driven by the electric motor 4, the inverter 6 for driving the electric motor 4, the motor housing 20 for receiving the electric motor 4, the inverter housing 7 for receiving the inverter 6, and at least one first bolt 51 and at least one second bolt 52, which are designed to attach and fix the inverter housing 7 to the motor housing 20. The motor housing 20 has the tubular main body section 24 and the flange section 130, which is formed on the front end face 24a (an end face) of the main body section 24. The front end face 24a of the main body section 24 and the flange section 130 are in contact with the inverter housing 7. The first bolt 51 fixes the inverter housing 7 to the main body section 24.The second bolt 52 fixes the inverter housing 7 to the flange section 130. This prevents resonance from occurring in the inverter housing 7 during operation of the electrically driven compressor 1. Furthermore, in the present embodiment, the main body section 24 assumes a round tubular shape, and the flange section 130 projects radially outwards from the front end face 24a (one end) of the main body section 24. This results in a simple design, increases the contact area of ​​the motor housing 20 with the inverter housing 7, and allows for bolt tightening at multiple points. Furthermore, the inverter housing 7 has an end wall 30, which abuts the front end face 24a (one end face) of the main body section 24 and the flange section 130 at its outer surface 30a. At least one through-hole 38 is formed in the end wall 30. The main body section 24 (front end face 24a) has at least one internal threaded section 24c. The external threaded section of the first bolt 51 is inserted into the through-hole 38 of the end wall 30 and screwed into the internal threaded section 24c. This allows the first bolt 51 to be screwed in from the inside of the inverter housing 7. Furthermore, the inverter housing 7 has an end wall 30, the outer surface 30a of which abuts the front end face 24a (one end face) of the main body section 24 and the flange section 130. At least one through-hole 38' is formed in the end wall 30. The flange section 130 has at least one internal threaded section 131. The external threaded section of the second bolt 52 is inserted into the through-hole 38' of the end wall 30 and screwed into the internal threaded section 131 of the flange section 130. This allows the second bolt 52 to be screwed in from the inside of the inverter housing 7. According to the present embodiment, the inlet channel P1 is formed on the front end face 24a (one of the end faces) of the main body section 24. The compression mechanism 5 is designed to compress and convey the refrigerant introduced into the main body section 24 through the inlet channel P1. The inverter housing 7 has the end wall 30, which abuts the front end face 24a of the main body section 24 and the flange section 130 at its outer surface 30a. The switching elements 35, which form the inverter 6, are provided on the portion of the inner surface 30b of the end wall 30 that is adjacent to the front end face 24a of the main body section 24.Therefore, the switching elements 35 can be cooled by the cold and low-pressure refrigerant flowing into the main body section 24 via the inlet channel P1, through the front end face 24a of the main body section 24 and the end wall 30 of the inverter housing 7. Furthermore, according to the present embodiment, the electrically driven compressor 1 is installed in a vehicle. The main body section 24 extends horizontally. The inverter housing 7 extends vertically. The upper part of the inverter housing 7 has prongs 39 for securing it to the vehicle. The inverter housing 7 projects downwards beyond the main body section 24. With this configuration of the electrically driven compressor 1, the occurrence of resonance in the inverter housing 7 during operation of the electrically driven compressor 1 can be suppressed. Fig. 22 shows a view illustrating a modified example of the electrically driven compressor 1 of the present embodiment, corresponding to Fig. 19 described above. In this modified example, several (four in this modified example) through-holes (not shown) are formed in the flange section 130. Furthermore, several (four in this modified example) internal threaded sections (not shown) are formed on the end wall 30 of the inverter housing 7. The external threaded sections of the second bolt 52 are inserted into the through-holes of the flange section 130 and screwed into the internal threaded sections of the end wall 30 of the inverter housing 7. Therefore, the second bolt 52 is screwed in from back to front. The following are examples of clauses that can be derived from the sixth embodiment described above and its modified example. [Clause 12] Electrically driven compressor, equipped with: an electric motor, a compression mechanism driven by the electric motor, an inverter for driving the electric motor, a motor housing for receiving the electric motor, and an inverter housing for receiving the inverter, and at least one first bolt and at least one second bolt to be applied and fixed, wherein the motor housing has a tubular main body section and a flange section formed on an end face of the main body section, the end face of the main body section and the flange section abut the inverter housing, the first bolt fixes the inverter housing to the main body section, and the second bolt fixes the inverter housing to the flange section. [Clause 13] Electrically driven compressor, according to clause 12, wherein the main body section assumes a round tube shape, and the flange section projects outwards in a radial direction over the end face of the main body section. [Clause 14] Electrically driven compressor, according to clause 12 or 13, wherein the inverter housing has an end wall, and the outer surface of the end wall rests against the end surface of the main body section and the flange section, at least one through-hole is formed in the end wall, at least one internal thread section is formed in the flange section, and the external thread section of the second bolt is passed through the through-hole of the end wall and screwed into the internal thread section of the flange section. [Clause 15] Electrically driven compressor, according to one of clauses 12 to 14, wherein an inlet channel is formed on the main body section adjacent to the end face, the compression mechanism is designed to compress and convey a refrigerant introduced from the inlet channel into the main body section, the inverter housing has an end wall, the outer surface of which rests against the end face of the main body section and the flange section, and switching elements are provided on the part of the inner surface of the end wall adjacent to the end face of the main body section, which form the inverter. [Clause 16] Electrically driven compressor, according to one of clauses 12 to 15, wherein the electrically driven compressor is installed in a vehicle, the main body section extends in a horizontal direction, the inverter housing extends in a vertical direction, nose sections are provided on the upper part of the inverter housing for fixing it to the vehicle, and the inverter housing extends downwards beyond the main body section. It is self-evident that the fixing method of the inverter housing 7 to the flange section 130 of the motor housing 20, as explained in the preceding sixth embodiment and its modified example, using at least one second bolt 52, is applicable to the electrically driven compressor 1 as explained in the preceding first to fifth embodiments and their modified example. In the first to sixth embodiments described above and their modified example, several first bolts 51 are used to fix the inverter housing 7 to the main body section 24 of the motor housing 20. In this respect, some of the first bolts 51 can be designed as long bolts to jointly fix the inverter cover 32, the inverter housing 7, and the main body section 24 of the motor housing 20. This allows some of the bolts 33 to be omitted. In the sixth embodiment described above and its modified example, several second bolts 52 are used to secure the inverter housing 7 and the flange section 130 of the motor housing 20. In this respect, some of the several second bolts 52 can be designed as long bolts to secure the inverter cover 32, the inverter housing 7, and the flange section 130 of the motor housing 20 together. This allows some of the bolts 33 to be omitted. In the first to sixth embodiments described above and their modified examples, the terms "front," "rear," "left," "right," "top," and "bottom" are defined as above for the purpose of illustrating the electrically driven compressor 1. However, this does not define the orientation of the electrically driven compressor 1. That is to say, in the first to sixth embodiments described above and their modified examples, the electrically driven compressor 1 is a transversely mounted electrically driven compressor in which the electric motor 4 and the compression mechanism 5 are arranged in series in the housing 2 in a horizontal direction. However, it can also be a longitudinally mounted electrically driven compressor in which the electric motor 4 and the compression mechanism 5 are arranged in series in the housing 2 in a vertical direction. In the aforementioned first to sixth embodiments and their modified examples, the electrically driven compressor 1 is a scroll compressor, but the electrically driven compressor 1 is not limited to a scroll compressor. The electrically driven compressor 1 can, for example, also be a so-called swashplate compressor. This was an explanation of the embodiments and their modified examples of the present invention, but the present invention is not limited to the embodiments and modified examples mentioned above, and further modifications based on the technical idea of ​​the present invention are of course possible. LIST OF REFERENCE MARKS 1 Electrically driven compressor 2 Housing 3 Shaft 4 Electric motor 5 Compression mechanism 6 Inverter 7 Inverter housing 8 Fixed spiral 8a Support 9 Swiveling spiral 10 Crank mechanism 13 Stator core unit 14 Rotor 15 Check valve 16 Oil separator 20 Motor housing 21 Tail housing 24 Main body section 24a Front end face 24b Rear end face 24c Internal thread section 25 Front tubular section 25a Front end face 26 Rear tubular section 26b Rear end face 27 Nose section 30 End wall 30a Outer surface 30a1 Mounting section 30a2 Exposed section 30b Inner surface 31 Peripheral wall 32 Inverter cover 33 Bolt 35 Switching element 36 Control board 38, 38' Through hole 39 Nose section 41 First projection section 42 Second Projection section 43, 44 Internal thread section 51 First bolt 52 Second bolt 100, 100', 100” Coupling element 101 Main section 102,102' Reinforcement section 111 First fastening section 111a Extension section 112 Second fastening section 113, 113', 114, 115, 115' Through hole 116, 116' Internal thread section 121, 122, 123 Bolt 130 Flange section 131 Internal thread section D1, D2 Screw-in direction H1 Inlet chamber H2 Compression chamber H3 Conveyor chamber H4 Chamber L1 Refrigerant channel L2 Conveyor bore P1 Inlet channel P2 Conveyor channel R1, R2 Direction of rotation, QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature JP 2022-138248 A

[0003]

Claims

Electrically driven compressor, equipped with: an electric motor, a compression mechanism driven by the electric motor, an inverter for driving the electric motor, a motor housing for receiving the electric motor, and an inverter housing which is attached to and fixed against the motor housing and which receives the inverter, wherein the motor housing has a tubular main body section and a first projecting section provided on the outer circumferential surface of the main body section, the inverter housing has an end wall, the outer circumferential surface of the end wall comprising a contact section which abuts an end face of the main body section and an exposed section which is exposed to the outside, a second projecting section is provided on the exposed section of the outer surface of the end wall, and the first projecting section is fixed directly or indirectly to the second projecting section. Electrically driven compressor according to claim 1, wherein the first projection section abuts the second projection section, and the first projection section is fixed directly to the second projection section by bolts. Electrically driven compressor according to claim 1, wherein the first projection section is indirectly fixed to the second projection section via a coupling element. Electrically driven compressor according to claim 3, wherein the coupling element comprises a first fastening section which is in surface contact with the first projection section and a second fastening section which is in surface contact with the second projection section, wherein the first fastening section is fixed to the first projection section and the second fastening section is fixed to the second projection section. Electrically driven compressor according to claim 4 wherein the fixing of the first fastening section to the first projection section and the fixing of the second fastening section to the second projection section are each effected by tightening bolts, wherein the first fastening section and the second fastening section are each configured to act as anti-rotation devices that suppress rotation of the coupling element relative to the first projection section and second projection section when tightening the bolts. Electrically driven compressor according to claim 4, wherein the coupling element additionally comprises a reinforcement section. Electrically driven compressor according to claim 1, wherein an inlet channel is formed on the main body section adjacent to the end face, the compression mechanism is designed to compress and convey a refrigerant introduced into the main body section through the inlet channel, and switching elements are provided on the part of the inner surface of the end wall adjacent to the system section, which form the inverter. Electrically driven compressor according to claim 1, wherein the electrically driven compressor is installed in a vehicle, the main body section extends in a horizontal direction, the inverter housing extends in a vertical direction, nose sections are provided on the upper part of the inverter housing for fixing to the vehicle, and the inverter housing extends downwards beyond the main body section. Electrically driven compressor according to claim 8, wherein the first projection section is provided at the lower end of the outer circumferential surface of the main body section, and the second projection section is provided on the exposed section of the outer surface of the end wall at the same height as the first projection section or at a height below the first projection section.

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