Electric compressor and air conditioning system equipped therewith

Abstract

To provide an electric compressor that allows a worker to easily and efficiently attach and detach a terminal cover when maintaining the electric compressor.SOLUTION: An electric compressor comprises; a housing for housing a compression mechanism; a plurality of terminal parts fixed while the inside and outside of the housing are airtightly sealed; a terminal guard 500 comprising a plurality of wall parts 501, 502, and 503 having a planar shape erected with respect to the housing, in which side parts of the wall parts are connected, and thereby surrounding the whole of the plurality of terminal parts while comprising an opening; and a terminal cover 600 comprising an overlap part 601 on the wall parts of the terminal guard, and covering the opening. One of the wall parts of the terminal guard is provided with an engagement part engaged with the terminal cover.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present disclosure relates to an electric compressor and an air conditioning apparatus provided with the same.

Background Art

[0002] Conventionally, terminal terminals for power supply are provided on the side surface of an electric compressor, and further, a structure for mounting a terminal cover for protecting the terminal terminals is provided. When the compressor is driven, a large current is supplied to the compressor because it is necessary to rotate a large motor inside the compressor main body. For this reason, a plurality of terminal terminals are arranged side by side on the side surface of the compressor, and the terminal guard and the terminal cover also increase in size as the number of terminal terminals increases.

[0003] Patent Document 1 discloses a terminal terminal attached to a sealed container enclosing a compression mechanism, and a terminal cover formed so as to cover the terminal terminal and electrical components connected to the terminal terminal.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the terminal cover mounting structure disclosed in Patent Document 1, a pair of projections provided inside the terminal cover are engaged with engagement holes of a terminal box mounted on the side surface of the compressor to be locked and fixed. With such a structure, an operator cannot visually confirm the engagement portion between the projection of the terminal cover and the engagement hole of the terminal box. There has been a problem that as the terminal box and the terminal cover become larger, a greater work burden is imposed.

[0006] This disclosure is made in view of these circumstances and aims to provide an electric compressor and an air conditioning system equipped therewith that allow workers to easily and efficiently attach and detach the terminal cover when performing maintenance on the electric compressor. [Means for solving the problem]

[0007] An electric compressor according to one aspect of several embodiments of the present disclosure comprises a housing for housing a compression mechanism, a plurality of terminal portions fixed to the housing in a state of airtight sealing between the inside and outside, a terminal guard having a plurality of planar wall portions erected on the housing and having an opening by connecting the sides of these wall portions to enclose the entire plurality of terminal portions, and a terminal cover having an overlapping portion with respect to the wall portions of the terminal guard to cover the opening, wherein one of the wall portions of the terminal guard is provided with an engaging portion that engages with the terminal cover.

[0008] An air conditioning system according to one embodiment of several embodiments of the present disclosure comprises the above-mentioned electric compressor. [Effects of the Invention]

[0009] According to this disclosure, the terminal cover can be easily and efficiently attached and removed when an operator performs maintenance on an electric compressor. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view of a compressor according to one embodiment of the present disclosure. [Figure 2] This is a left side view of a compressor according to one embodiment of the present disclosure. [Figure 3] Figure 2 is a partially enlarged view of the connection mechanism shown. [Figure 4] Figure 2 is a plan view of the compressor. [Figure 5]Figure 2 is a cross-sectional view of the compressor taken along the line AA. [Figure 6] A perspective view showing the area around the terminal guard according to one embodiment of this disclosure. [Figure 7] The diagram shows the area around a terminal guard according to one embodiment of the present disclosure, where (a) is a cross-sectional view when there is no notch in the upper wall and (b) is a cross-sectional view when there is a notch in the upper wall. [Figure 8] This is a perspective view of a terminal cover according to one embodiment of the present disclosure. [Figure 9] This is a perspective view showing a terminal cover attached to a terminal guard according to one embodiment of the present disclosure. [Figure 10] This figure shows a modified example of a terminal cover according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0011] [Compressor Overview] A compressor according to one embodiment of this disclosure will be described below with reference to the drawings. As shown in Figure 1, the compressor 1 is used in an air conditioner and compresses a refrigerant Rf, such as carbon dioxide, in two stages. The compressor 1 is fixed to the mounting surface FL via legs 3. The compressor 1 comprises a housing 11, a rotary compression mechanism (low-stage compression mechanism) 12 located inside the housing 11, a scroll compression mechanism (high-stage compression mechanism) 13, an electric motor 14, and a rotating shaft 15.

[0012] The housing 11 comprises a cylindrical main body 21, an upper cover 22 that closes the opening at the top of the main body 21, and a lower cover 23 that closes the opening at the bottom of the main body 21. Furthermore, a sealed space is formed inside the housing 11, which is defined by the main body 21, the upper cover 22, and the lower cover 23.

[0013] The rotating shaft 15 is provided inside the housing 11 so as to extend vertically along the axis X. The rotating shaft 15 is a member for transmitting the driving force from the electric motor 14 to the rotary compression mechanism 12 and the scroll compression mechanism 13. The upper end portion of the rotating shaft 15 is rotatably supported by a scroll-side bearing 31. Further, the lower end portion of the rotating shaft 15 is rotatably supported by two bearings, namely an upper bearing 32A (rotary-side upper bearing) and a lower bearing 32B (rotary-side lower bearing).

[0014] The electric motor 14 is disposed at the center in the longitudinal direction of the rotating shaft 15 and on the outer peripheral side of the rotating shaft 15, and rotates the rotating shaft 15 around the axis X. The electric motor 14 includes a rotor 38 fixed to the outer peripheral surface of the rotating shaft 15, and a stator 39 that faces the rotor 38 in the radial direction with a gap from the outer peripheral surface of the rotor 38 and is fixed to the inner wall of the main body portion 21 of the housing 11 by shrink fitting or the like.

[0015] The rotor 38 is provided with rotor passages 38a arranged at predetermined intervals in the circumferential direction around the axis X. Each rotor passage 38a penetrates the rotor 38 in the vertical direction (the direction of the axis X). The refrigerant Rf discharged from the rotary compression mechanism 12 flows upward through these rotor passages 38a. Rotor weights 37 are provided on the upper surface and the lower surface of the rotor 38. Each rotor weight 37 is fixed by a pin 38c that penetrates the laminated steel sheets of the rotor 38 in the direction of the axis X. An oil separation plate 38b is fixed to the upper surface of the rotor weight 37 installed at the upper portion of the rotor 38. The oil separation plate 38b has a disc shape and is arranged to extend in the horizontal direction. The oil separation plate 38b rotates around the axis X together with the rotor 38.

[0016] The electric motor 14 is connected to a power supply via an inverter (not shown), and rotates the rotating shaft 15 at a variable frequency.

[0017] The rotary compression mechanism 12 is located inside the housing 11, on the lower end side of the rotating shaft 15. In this embodiment, the rotary compression mechanism 12 has two cylinders and includes an eccentric shaft portion 41 provided on the rotating shaft 15, a rotor 42 fixed to the eccentric shaft portion 41 and rotating within the compression chamber C1 eccentrically with respect to the axis X as the rotating shaft 15 rotates, and a cylinder 44 in which the compression chamber C1 is formed.

[0018] The compression chamber C1 formed in the cylinder 44 is supplied with refrigerant Rf from the outside via the suction pipe 33 and the suction boss 35 (boss portion). The refrigerant compressed in the compression chamber C1 is discharged through the upper bearing 32A from the rotary discharge pipe 43 to the area below the electric motor 14 in the housing 11.

[0019] The two cylinders 44, flanked by the separator plate 45, are positioned between the upper bearing 32A and the lower bearing 32B, and are fixed (fastened) from below to the upper bearing 32A and the lower bearing 32B by bolts (not shown). Below the cylinder 44 is an oil pump 49, which is fixed by bolts (not shown). The oil pump 49 draws oil from an oil reservoir at the bottom of the housing 11 and guides it to the scroll side bearing 31 through an oil supply hole 15a that penetrates along the axis X of the rotating shaft 15.

[0020] The scroll compression mechanism 13 is located inside the housing 11 on the upper end side of the rotating shaft 15. The scroll compression mechanism 13 includes a fixed scroll 51 fixed to the scroll-side bearing 31 and an orbiting scroll 57 positioned below the fixed scroll 51 and opposite to the fixed scroll 51.

[0021] The fixed scroll 51 has an end plate 52 fixed to the upper surface of the scroll-side bearing 31 and a fixed wrap 53 that protrudes downward from the end plate 52. In the central part of the end plate 52 (near the axis X), a discharge hole 52a is formed that penetrates along the direction of the axis X.

[0022] The orbiting scroll 57 is positioned so as to be sandwiched between the scroll-side bearing 31 and the fixed scroll 51 in the axial X direction. The orbital scroll 57 has an end plate 58 connected to the eccentric shaft portion 56 of the rotation axis 15 and an orbital wrap 59 that protrudes upward from the end plate 58.

[0023] The end plate 58 is slidably connected to an eccentric shaft portion 56 provided at the upper end of the rotating shaft 15 via a drive bush 55, and rotates eccentrically with respect to the axis X as the rotating shaft 15 rotates.

[0024] The rotating wrap 59 engages with the fixed wrap 53, forming a compression chamber C2 between them that compresses the refrigerant Rf.

[0025] A balance weight chamber 63 is formed between the recess formed in the center of the scroll-side bearing 31 and the lower part of the orbiting scroll 57. In the balance weight chamber 63, the rotation axis weight 54 rotates together with the rotation axis 15.

[0026] The rotating shaft weight 54 is shrink-fitted into the drive bush 55 and inserted into the eccentric shaft portion 56. The rotating shaft weight 54 rotates eccentrically with respect to the axis X as the rotating shaft 15 rotates, thereby balancing the rotating scroll 57, which rotates eccentrically with respect to the axis X, with respect to the axis of rotation.

[0027] The refrigerant Rf, compressed by the rotary compression mechanism 12 and discharged into the housing 11, is drawn into the compression chamber C2 from the outer circumference of the scroll compression mechanism 13 and compressed toward the center. The compressed refrigerant Rf is discharged to the outside of the housing 11 through the discharge hole 52a formed in the fixed scroll 51 and the discharge pipe 34.

[0028] Below the scroll-side bearing 31, a cover 48 is provided to cover the scroll-side bearing 31. The cover 48 is formed from sheet metal and has a cylindrical shape that gradually widens from bottom to top. An intake opening 48a is formed at the lower end of the cover 48. That is, the intake opening 48a is an annular region that opens downward and is formed between the cover 48 and the rotation axis 15 in the circumferential direction with respect to the axis X. The cover 48 separates the space on the electric motor 14 side of the housing 11 from the space on the scroll side bearing 31 side, so that the refrigerant drawn in from the intake opening 48a is guided to the scroll compression mechanism 13.

[0029] An oil level tank 60 is provided outside and below the housing 11. The oil level tank 60 is a hollow container and is in communication with the inside of the housing 11 via a lower pipe 61 located at the bottom and a pressure equalizing pipe 62 located at the top. A socket 65 is provided on the top of the oil level tank, and a level gauge (not shown) is installed in the socket 65. Oil is drawn into the oil level tank 60 from the oil reservoir inside the housing 11 via the lower piping 61, and the oil level in the reservoir can be measured by a level gauge installed in the socket 65.

[0030] An oil return pipe 67 is provided inside the housing 11, extending vertically while in contact with the inner wall of the housing 11. The upper end of the oil return pipe 67 is fixed to the scroll-side bearing 31, and the lower end is positioned in the oil reservoir at the bottom of the housing 11.

[0031] [About the connection mechanism] Next, the hermetic terminals (terminal sections) 110, 120, and 130 provided by the compressor 1 of this embodiment will be described with reference to Figures 2, 3, and 5. Figure 2 is a left side view of the compressor 1 shown in Figure 1. Figure 3 is a partially enlarged view of the connection mechanism 200 shown in Figure 2. Figure 5 is a cross-sectional view of the compressor 1 shown in Figure 2, taken along the line AA.

[0032] As shown in Figures 2, 3, and 5, the compressor 1 includes three hermetic terminals 110, 120, and 130, and a connection mechanism 200. The compressor 1 also includes a terminal guard 500 erected on the side of the main body 21, surrounding the three hermetic terminals 110, 120, and 130 and the connection mechanism 200. As shown in Figure 5, the main body 21 of the housing 11 has three through holes 21A, 21B, and 21C. Hermetic terminal 110 is inserted into through hole 21A, hermetic terminal 120 is inserted into through hole 21B, and hermetic terminal 130 is inserted into through hole 21C.

[0033] Hermetic terminals 110, 120, and 130 are joined to through holes 21A, 21B, and 21C, respectively, by welding. Hermetic terminals 110, 120, and 130 are sealed so that the enclosed space CS and the external space OS do not communicate with each other.

[0034] Next, the connection mechanism 200 will be described with reference to Figures 2 to 4. The connection mechanism 200 is fixed to the main body 21 of the housing 11 and electrically connects the hermetic terminals 110, 120, and 130 to the U-phase cable 310, V-phase cable 320, and W-phase cable 330.

[0035] As shown in Figure 3, the connection mechanism 200 includes three busbars 210, 220, and 230, a terminal block 240, and nine connecting cables 251, 252, 253, 254, 255, 256, 257, 258, and 259.

[0036] The three busbars 210, 220, and 230 are each made of a conductive metallic material. One U-phase cable 310 is electrically connected to busbar 210 via a crimp terminal 311. One V-phase cable 320 is electrically connected to busbar 220 via a crimp terminal 321. One W-phase cable 330 is electrically connected to busbar 230 via a crimp terminal 331.

[0037] The terminal block 240 is a structure on which the busbars 210, 220, and 230 are fixed and on which the main body 21 of the housing 11 is installed. The terminal block 240 installs the busbars 210, 220, and 230 on the main body 21 of the housing 11 in such a way that they maintain an insulating state from the main body 21 of the housing 11.

[0038] Three connecting cables 251, 254, and 257, each connected to hermetic terminals 110, 120, and 130 respectively, are connected to busbar 210 via crimp terminals 251a, 254a, and 257a. Three connecting cables 252, 255, and 258, each connected to hermetic terminals 110, 120, and 130 respectively, are connected to busbar 220 via crimp terminals. Three connecting cables 253, 256, and 259, each connected to hermetic terminals 110, 120, and 130 respectively, are connected to busbar 230 via crimp terminals 253a, 256a, and 259a.

[0039] As shown in Figure 3, three connecting cables 251, 254, and 257 are connected to the busbar 210. Connecting cable 254 is connected to the busbar 210 at the position of crimp terminal 254a, at a position where the straight line L2 connecting the position of crimp terminal 251a where connecting cable 251 is connected to the busbar 210 and the position of crimp terminal 257a where connecting cable 257 is connected to the busbar 210 does not pass through.

[0040] Here, it is assumed that three connecting cables are connected to each of the busbars 210, 220, and 230, but other configurations are also possible. For example, the hermetic terminals 110, 120, and 130 may each have any number of pins, three or more, and any number of connecting cables, three or more, may be connected to each of the busbars 210, 220, and 230.

[0041] The U-phase cable 310, V-phase cable 320, and W-phase cable 330 are connected to the UVW output terminals of a control unit (not shown) that outputs three-phase AC current to be applied to the electric motor 14. The U-phase cable 310 transmits the U-phase current via the busbar 210 to the hermetic terminals 110, 120, and 130 via connecting cables 251, 254, and 257.

[0042] The V-phase cable 320 transmits the V-phase current via the busbar 220 to the hermetic terminals 110, 120, and 130 via connecting cables 252, 255, and 258. The W-phase cable 330 transmits the W-phase current via the busbar 230 to the hermetic terminals 110, 120, and 130 via connecting cables 253, 256, and 259.

[0043] The electric motor 14 in this embodiment is a three-phase AC motor having U, V, and W terminals. The three pins of the hermetic terminal 110 inserted into the through hole 21A are connected to the U, V, and W terminals of the electric motor 14, respectively. The three pins of the hermetic terminal 120 inserted into the through hole 21B are connected to the U, V, and W terminals of the electric motor 14, respectively. The three pins of the hermetic terminal 130 inserted into the through hole 21C are connected to the U, V, and W terminals of the electric motor 14, respectively.

[0044] The terminal block 111, which corresponds to the hermetic terminal 110, has three through holes through which a corresponding strap is inserted. The three straps, which are fixed to the hermetic terminal 110, are connected to the bus bar 210 by three connecting cables 251, 254, and 257. The terminal block 112, which corresponds to the hermetic terminal 120, has three through-holes through which a corresponding strap is inserted. The three straps, which are fixed to the hermetic terminal 120, are connected to the busbar 220 by three connecting cables 252, 255, and 258. The terminal block 113 corresponding to the hermetic terminal 130 has three through holes, through which a corresponding strap is inserted. The three straps that are fixed to the hermetic terminal 130 are connected to the bus bar 230 by three connecting cables 253, 256, and 259.

[0045] As shown in Figure 4, the connection mechanism 200 has a terminal cover 600. The terminal cover 600 protects the three busbars 210, 220, and 230, the terminal block 240, and the nine connecting cables 251, 252, 253, 254, 255, 256, 257, 258, and 259 from being exposed to the outside. Figures 2 and 3 show the connection mechanism 200 with the terminal cover 600 removed.

[0046] [Regarding terminal guards and terminal covers] Hereinafter, with reference to Figures 6 to 9, a terminal guard 500 and a terminal cover 600 according to one embodiment of this disclosure will be described. Figure 6 is a perspective view showing the area around a terminal guard 500 according to one embodiment of the present disclosure. The terminal guard 500 is a fence-like member that is erected and fixed to the side of the main body, which is roughly cylindrical in shape, so as to surround the three hermetic terminals 110, 120, 130 and the connection mechanism 200. More specifically, the terminal guard 500 has a rectangular upper wall portion (wall) 501 located above the ground surface of the compressor, a rectangular lower wall portion (wall) 502 located below the upper wall portion 501 relative to the ground surface, and two side wall portions (walls) 503 that are connected to the widthwise ends of the upper wall portion 501 and the lower wall portion 502 and extend in the vertical direction.

[0047] The upper side wall portion 501 has bent surfaces (side portions) 501a at both ends that are bent downward at approximately right angles in the lateral direction in Figure 6. The bent surfaces 501a at both ends and the upper region of the side wall portion 503 overlap with each other.

[0048] Furthermore, the upper surface of the upper wall portion 501 has a protrusion (projection) 504 formed by bending a portion of the front end portion 501c opposite to the main body portion upward in an L-shape. One protrusion 504 is provided on each side of the upper wall portion 501. The protrusions 504 engage with the engagement holes 604 of the terminal cover 600, which will be described later.

[0049] The lower wall portion 502 is the lower wall portion of the terminal guard 500, located on the side that touches the compressor, and has a rectangular shape, similar to the upper wall portion 501. The lower wall portion 502 also has bent surfaces (side portions) 502a at both ends that are bent upward at approximately right angles in the lateral direction in Figure 6. The bent surfaces 502a at both ends and the lower region of the side wall portion 503 overlap.

[0050] Furthermore, the lower surface of the lower wall portion 502 is provided with insertion holes 508 for each cable, allowing the U-phase cable, V-phase cable, W-phase cable, and earth cable to be inserted into the interior of the terminal guard 500.

[0051] The upper and lower ends of the side wall portion 503 are connected to the curved surface 501a of the upper side wall portion 501 and the curved surface 502a of the lower side wall portion 502, respectively, so as to close the gap between the curved surface 501a of the upper side wall portion 501 and the curved surface 502a of the lower side wall portion 502. In this way, the side wall portion 503 is connected to the upper side wall portion 501 and the lower side wall portion 502, so that the terminal guard 500 has an opening on the side opposite to the main body and the three hermetic terminals 110, 120, 130 and the connection mechanism 200 are surrounded by the walls 501, 502, and 503. Furthermore, since the terminal guard 500 has an opening perpendicular to the side of the main body, the worker can easily access the three hermetic terminals 110, 120, 130 and the connection mechanism 200.

[0052] Furthermore, a notch 505 is provided at the position enclosed by the dashed ellipse in Figure 6, that is, at the corner 507 of the bent portion 501b of the upper wall portion 501. Figure 7 is a cross-sectional view of the terminal guard 500 according to one embodiment of the present disclosure. Specifically, Figure 7(a) is a cross-sectional view when the notch 505 is not provided at the corner 507 of the bent portion 501b of the upper wall portion 501. Figure 7(b) is a cross-sectional view when the notch 505 is provided at the corner 507 of the bent portion 501b of the upper wall portion 501. As shown in Figure 7(b), notches 505 are provided at the corners 507 of each bent portion 501b on both sides of the upper wall portion 501. By providing notches 505 at the corners 507, that is, by providing a space in the direction of access to the hermetic terminal (the direction of the dashed line in Figure 7(b)), it becomes easier for workers to access the hermetic terminal when attaching terminal blocks or cables to the hermetic terminal, thereby improving the workability of assembly or maintenance. In this embodiment, the example described is one in which a notch 505 is provided at the corner 507 of the bent portion 501b of the upper wall portion 501. However, the technical scope of this disclosure is not limited to this example, and the notch 505 may not be provided as shown in Figure 7(a). Furthermore, the shape and dimensions of the notch 505 are not limited to this example and may be appropriately changed according to design requirements, etc.

[0053] Figure 8 is a perspective view of a terminal cover 600 according to one embodiment of the present disclosure. Figure 8 shows the terminal cover 600 as viewed from the inside. The terminal cover 600 is a member shaped to cover the opening of the terminal guard 500. More specifically, the terminal cover 600 has a U-shaped overlapping wall portion (overlapping portion) 601 and a planar sealing wall portion 602 that covers the opening of the terminal guard. Specifically, the overlapping wall portion 601 is formed by erecting from each of the three sides of the sealing wall portion 602. The terminal cover 600 is manufactured, for example, by sheet metal processing.

[0054] The overlapping wall portion 601 forms a U-shaped surface that is provided to form a space inside the terminal cover 600, and each of the wall portions overlaps with the upper wall portion 501 or the side wall portion 503 of the terminal guard 500. In addition, the overlapping wall portion 601 has an engagement hole 604 that engages with the protrusion 504 of the upper wall portion 501 of the terminal guard 500 at a position corresponding to the protrusion 504.

[0055] The sealing wall portion 602 is a surface that covers the opening of the terminal guard 500 and is a shielding member that prevents air and water from entering the terminal guard 500 from the three hermetic terminals 110, 120, 130 and the connection mechanism 200 inside the terminal guard 500.

[0056] Figure 9 shows the terminal cover 600 attached to the terminal guard 500. As shown in Figure 9, the terminal cover 600 is attached to the terminal guard 500 by closely fitting the overlapping wall portion 601 to overlap the upper wall portion 501 and the side wall portion 503. When the terminal cover 600 is attached to the terminal guard 500, the opening of the terminal guard 500 is covered by the sealing wall portion 602. The terminal cover 600 is formed to dimensions corresponding to the shape and dimensions of the terminal guard 500 and is attached so as to fit closely to the terminal guard. This makes it possible to minimize the dimensions of both the terminal guard 500 and the terminal cover 600.

[0057] Furthermore, it is possible to prevent fluids such as air or water generated by condensation from entering the inside of the terminal guard 500, thereby preventing deterioration or failure of the elements inside the terminal guard 500.

[0058] Furthermore, when attaching the terminal cover 600 to the terminal guard 500, the terminal cover 600 can be easily attached by placing the terminal cover 600 over the terminal guard 500 from above so that the engagement hole 604 engages with the protrusion 504.

[0059] Figure 10 shows a modified example of the terminal cover 600. As shown in Figure 10, the terminal cover 600 may have sealing members 605 (hatched areas in Figure 10) provided on the inner surface of each overlapping wall portion 601. The sealing member 605 is provided on the inner surface of the overlapping wall portion 601 and is a member that seals the gap between the overlapping wall portion 601 and the upper wall portion 501 and side wall portion 503 of the terminal guard 500. The sealing member 605 is a foamed sealing material made of rubber such as urethane or ethylene propylene dioxide (EPDM), and is adhered to the overlapping wall portion 601 using an adhesive such as double-sided tape.

[0060] In this way, by providing a sealing member 605 on the overlapping wall portion 601, even if a gap occurs between the overlapping wall portion 601 and the upper and side walls of the terminal guard due to the cumulative tolerance of each component, the gap can be sealed by the sealing member 605. This makes it possible to more reliably prevent fluids such as water generated by condensation from entering the airtight space formed by the terminal guard and terminal cover 600.

[0061] The area in which the sealing member 605 is provided to close the gap between the overlapping wall portion 601 and the upper and side walls of the terminal guard may be changed as appropriate. For example, in the example shown in Figure 10, the sealing member 605 is provided on all three overlapping wall portions 601, but the sealing member 605 may be provided only on the edges of the overlapping wall portions 601 and around the engagement holes 604. Alternatively, the sealing member 605 may not be provided on the overlapping wall portions 601, but on the upper wall portion 501 or the side wall portion 503 of the terminal guard 500.

[0062] According to the embodiments described above, the following effects and advantages are achieved. The terminal cover 600 is attached to the terminal guard 500 by closely fitting its overlapping wall portion 601 to overlap the three wall portions 501 and 503, namely the upper wall portion 501 and the side wall portions 503. In other words, the terminal cover 600 is formed to dimensions corresponding to the shape and dimensions of the terminal guard 500 and is attached so as to fit closely to the terminal guard 500. This makes it possible to minimize the dimensions of both the terminal guard 500 and the terminal cover 600.

[0063] Furthermore, when the terminal cover 600 is attached to the terminal guard 500, the opening of the terminal guard 500 is covered by the sealing wall portion 602. Therefore, when the terminal cover 600 is attached to the terminal guard 500, it is possible to prevent as much as possible from fluids such as water generated by condensation entering the inside of the terminal guard 500. In other words, deterioration and failure of the three hermetic terminals 110, 120, and 130 can be suppressed.

[0064] Furthermore, the upper surface of the upper wall portion 501 of the terminal guard 500 is provided with a protrusion 504 formed by bending a part of the front end portion 501c in the direction opposite to the main body in an L-shape upwards. The terminal cover 600 is attached to the terminal guard 500 by engaging the protrusion 504 with the engagement hole 604 provided in the terminal cover 600. In this way, the protrusion 504 and the engagement hole 604 act as engagement parts, allowing workers to easily and efficiently attach or detach the terminal cover 600 to the terminal guard 500 when performing maintenance on the compressor.

[0065] Furthermore, by providing a notch 505 at the corner 507 of the bent portion 501b of the upper wall portion 501 of the terminal guard 500, it becomes easier for workers to access the hermetic terminals 110, 120, and 130 located inside the terminal guard 500 when attaching terminal blocks or cables to the hermetic terminals, thereby improving the workability of assembly or maintenance.

[0066] Furthermore, by providing sealing members 605 on the inner surface of each overlapping wall portion 601 of the terminal cover 600, when the terminal cover 600 is attached to the terminal guard 500, the gap between the upper wall portion 501 and the side wall portion 503 of the terminal guard 500 and the overlapping wall portion 601 of the terminal cover 600 can be sealed. Therefore, it is possible to more reliably prevent fluids such as water generated by condensation from entering the airtight space formed by the terminal guard 500 and the terminal cover 600.

[0067] Although the present disclosure has been described above using embodiments, the technical scope of this disclosure is not limited to the scope described in the embodiments above. Various modifications or improvements can be made to the embodiments without departing from the gist of this disclosure, and such modified or improved forms are also included in the technical scope of this disclosure. Furthermore, the embodiments above may be combined as appropriate.

[0068] <Note> The electric compressor and air conditioning system equipped therewith described in the above-described embodiment can be understood, for example, as follows. The electric compressor (1) according to this disclosure comprises a housing (11) for housing a compression mechanism, a plurality of terminal portions (110, 120, 130) fixed in a state where the inside and outside of the housing are hermetically sealed, a terminal guard (500) having a plurality of planar wall portions (501, 502, 503) erected on the housing and having an opening when the sides of these wall portions are connected, and a terminal cover (600) that covers the opening and has an overlapping portion (601) on the wall portion of the terminal guard, wherein one of the wall portions of the terminal guard is provided with an engaging portion that engages with the terminal cover.

[0069] According to the first aspect of the present disclosure, an engaging portion is provided on one wall of the terminal guard surrounding a plurality of terminal sections, so that the terminal cover can be attached to the terminal guard starting from this engaging portion. The terminal cover covers the opening of the terminal guard while partially overlapping the wall of the terminal guard. In this way, the terminal cover has overlapping portions with respect to each wall of the terminal guard. The terminal cover is formed to dimensions corresponding to the shape and dimensions of the terminal guard and is attached so as to be in close contact with the terminal guard. This makes it possible to minimize the dimensions of the terminal guard and terminal cover. Furthermore, when the terminal cover is attached, it is possible to prevent as much as possible from fluids such as water generated by condensation from entering the inside of the terminal guard, and thereby prevent deterioration and failure of the terminal sections. In addition, since the terminal cover engages with the terminal guard by the engaging portion provided on one wall of the terminal guard, the terminal cover can be attached and removed easily and efficiently by the operator when performing maintenance on the electric compressor.

[0070] In the electric compressor according to a second aspect of this disclosure, the engaging portion may be a projection (504) provided on the wall portion of the upper surface of the terminal guard, in the first aspect.

[0071] According to the electric compressor described herein, the terminal guard and the terminal cover engage with each other through a projection provided on the upper wall of the terminal guard. This allows the operator to confirm the position of the engagement point from their perspective when aligning a large and heavy terminal cover during installation. As a result, the operator can easily and efficiently install and remove the terminal cover.

[0072] In the third aspect of the present disclosure, the electric compressor may be provided with a notch (505) at the corner of the wall portion on the upper surface of the terminal guard, as in the first or second aspect.

[0073] According to the electric compressor described herein, notches are provided at the corners of the upper wall portion of the terminal guard. This makes it easier for workers to access the terminal portion when attaching terminal blocks or cables to the terminal portion, thereby improving the workability of assembly or maintenance.

[0074] In the electric compressor according to the fourth aspect of this disclosure, a sealing member (605) may be provided on the edge of the overlapping portion in any of the first to third aspects.

[0075] According to the electric compressor of this disclosure, a sealing member is provided at the edge of the overlapping portion. That is, the ends of the surfaces that come into contact with each wall surface of the terminal guard and the terminal cover are sealed by the sealing member. This makes it possible to more reliably prevent fluids such as water generated by condensation from entering the airtight space formed by the terminal guard and the terminal cover.

[0076] An air conditioning system according to a fifth aspect of this disclosure comprises an electric compressor according to this disclosure in any of the first to fourth aspects. [Explanation of Symbols]

[0077] 1. Compressor 3 legs 11 Housing 12. Rotary Compression Mechanism (Lower Stage Compression Mechanism) 13. Scroll compression mechanism (high-stage compression mechanism) 14 Electric motor 15 Rotation axis 15a Oil supply hole 21 Main body 21A, 21B, 21C through hole 22 Top lid 23 Lower lid part 31 Scroll side bearing 32A Upper bearing 32B Lower bearing 33 Suction pipe 34 Discharge pipe 37 Rotor weight 38 rotors 38a Rotor aisle 38b Oil Separation Plate 39 Status 41 Eccentric shaft part 43 Rotary discharge pipe 44 cylinders 48 Cover 48a Suction opening 49 Oil pump 51 Fixed Scroll 52 End plate 52a Discharge hole 53 Fixing Wrap 54. Rotation axis weight (balance weight) 55 Drive Bushing 56 Eccentric shaft part 57 Rotating Scroll 58 End plate 59 Turning lap 60 Oil level tank 61 Lower piping 62 Pressure equalization pipe 63 Balance Weight Room 65 sockets 67 Oil return pipe 110, 120, 130 hermetic terminals 111,112,113 Terminal Blocks 200 connection mechanism 210 Busbar 220 Bus Bar 230 Bus Bar 240 Terminal block 251, 252, 253, 254, 255, 256, 257, 258, 259 Connecting Cables 251a, 253a, 257a, 259a crimp terminals 310 U-phase cable 311, 321, 331 Crimp terminals 320 V-phase cable 330 W-phase cable 500 Terminal Guard 501 Upper wall 501a Bent surface 501b Bent part 501c front end 502 Lower wall part 502a Bent surface 503 Side wall section 504 Convex part 505 Notch 507 Corner 508 Through hole 600 Terminal Cover 601 Overlapping wall section 602 Sealing wall section 604 Engagement hole 605 Sealing member CS closed space OS external space Rf refrigerant X axis

Claims

1. A housing that accommodates the compression mechanism, Multiple terminal portions are fixed in a state where the inside and outside of the housing are hermetically sealed, A terminal guard having multiple planar wall sections erected on the housing, with the sides of these wall sections connected to form an opening that encloses the entirety of the multiple terminal sections, A terminal cover having an overlapping portion with the wall portion of the terminal guard and covering the opening, Equipped with, One of the walls of the terminal guard is provided with an engaging portion that engages with the terminal cover. The engaging portion is an electric compressor, which is a projection provided on the wall portion of the upper surface of the terminal guard and is provided to protrude upward from the wall portion of the upper surface.

2. The electric compressor according to claim 1, wherein a notch is provided at the corner of the wall portion of the upper surface of the terminal guard.

3. The electric compressor according to claim 1, wherein a sealing member is provided at the edge of the overlapping portion.

4. An air conditioning system comprising the electric compressor described in claim 1.

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