JP2024076713A - Electric compressor and air conditioner equipped with same - Google Patents

Abstract

[Problem] To provide an electric compressor that allows an operator to easily and efficiently attach and remove a terminal cover when performing maintenance on the electric compressor. [Solution] The electric compressor includes a housing that accommodates a compression mechanism, a plurality of terminals that are fixed in a state in which the inside and outside of the housing are airtightly sealed, a terminal guard 500 having a plurality of planar walls 501, 502, 503 erected on the housing and having an opening by connecting the sides of these walls, which entirely surrounds the plurality of terminals, and a terminal cover 600 having an overlapping portion 601 on the wall of the terminal guard to cover the opening, and one wall of the terminal guard is provided with an engagement portion that engages with the terminal cover. [Selected Figure] Figure 9

Description

This disclosure relates to an electric compressor and an air conditioner equipped with the same.

Conventionally, electric compressors are provided with terminals for power supply on the side, and a structure is also provided for attaching a terminal cover to protect the terminals. When the compressor is in operation, a large motor inside the compressor body needs to rotate, so a large current is supplied to the compressor. For this reason, multiple terminals are arranged side by side on the compressor side, and the terminal guard and terminal cover also become larger as the number of terminals increases.

Patent document 1 discloses a terminal attached to a sealed container that contains a compression mechanism, and a terminal cover formed to cover the terminal and electrical components connected to the terminal.

JP 2006-161703 A

However, the terminal cover mounting structure disclosed in Patent Document 1 is structured so that a pair of protrusions provided inside the terminal cover engage with engaging holes in a terminal box mounted on the side of the compressor to lock and secure the terminal cover. With this structure, workers cannot visually confirm the engagement points between the protrusions on the terminal cover and the engaging holes in the terminal box. The problem is that the larger the terminal box and terminal cover are, the greater the workload required.

This disclosure has been made in light of these circumstances, and aims to provide an electric compressor and an air conditioner equipped with the same that enable workers to easily and efficiently install and remove a terminal cover when performing maintenance on the electric compressor.

An electric compressor according to one aspect of some embodiments of the present disclosure includes a housing that accommodates a compression mechanism, a plurality of terminals fixed in a state in which the inside and outside of the housing are airtightly sealed, a terminal guard having a plurality of planar walls erected against the housing and having an opening formed by connecting the sides of the walls, which entirely surrounds the plurality of terminals, and a terminal cover having an overlapping portion with the wall of the terminal guard to cover the opening, and one of the walls of the terminal guard is provided with an engagement portion that engages with the terminal cover.

An air conditioner according to one aspect of some embodiments of the present disclosure includes the above-described electric compressor.

The present disclosure has the advantage that workers can easily and efficiently install and remove the terminal cover when performing maintenance on the electric compressor.

FIG. 1 is a cross-sectional view of a compressor according to an embodiment of the present disclosure. FIG. 2 is a left side view of a compressor according to an embodiment of the present disclosure. FIG. 3 is a partial enlarged view of the connection mechanism shown in FIG. 2 . FIG. 3 is a plan view of the compressor shown in FIG. 2 . 3 is a cross-sectional view of the compressor shown in FIG. 2 taken along the line AA. FIG. 2 is a perspective view showing a terminal guard and its surroundings according to an embodiment of the present disclosure. 1A and 1B show a terminal guard and its surroundings according to one embodiment of the present disclosure, in which (a) is a cross-sectional view when no notch is provided in the upper wall portion, and (b) is a cross-sectional view when a notch is provided in the upper wall portion. FIG. 2 is a perspective view of a terminal cover according to one embodiment of the present disclosure. 1 is a perspective view showing a terminal cover according to an embodiment of the present disclosure attached to a terminal guard; 13A and 13B are diagrams illustrating modified examples of a terminal cover according to an embodiment of the present disclosure.

[Compressor Overview]
Hereinafter, a compressor according to an embodiment of the present disclosure will be described with reference to the drawings.
1, a compressor 1 is used in an air conditioner and compresses a refrigerant Rf, which is a gas such as carbon dioxide, in two stages. The compressor 1 is fixed to an installation surface FL via legs 3.
The compressor 1 includes a housing 11 , a rotary compression mechanism (low-stage compression mechanism) 12 provided inside the housing 11 , a scroll compression mechanism (high-stage compression mechanism) 13 , an electric motor 14 , and a rotating shaft 15 .

The housing 11 includes a cylindrical main body 21 , an upper lid 22 that closes an upper opening of the main body 21 , and a lower lid 23 that closes a lower opening of the main body 21 .
An enclosed space is formed inside the housing 11 defined by the main body 21, the upper cover 22 and the lower cover 23.

The rotating shaft 15 is provided inside the housing 11 and extends 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.
An upper end portion of the rotating shaft 15 is rotatably supported by a scroll-side bearing 31. A lower end portion of the rotating shaft 15 is rotatably supported by two bearings, an upper bearing 32A (a rotary-side upper bearing) and a lower bearing 32B (a rotary-side lower bearing).

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

The rotor 38 is provided with rotor passages 38a arranged at predetermined intervals in the circumferential direction about the axis X. Each rotor passage 38a penetrates the rotor 38 in the up-down 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 and lower surfaces of the rotor 38. Each rotor weight 37 is fixed by a pin 38c that penetrates stacked steel plates 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 on the upper part of the rotor 38. The oil separation plate 38b is disk-shaped and disposed so as to extend in the horizontal direction. The oil separation plate 38b rotates together with the rotor 38 around the axis X.

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

The rotary compression mechanism 12 is provided inside the housing 11 at the lower end side of the rotary shaft 15 .
In this embodiment, the rotary compression mechanism 12 is a two-cylinder mechanism including an eccentric shaft portion 41 provided on the rotating shaft 15, a rotor 42 fixed to the eccentric shaft portion 41 and rotating inside the compression chamber C1 eccentrically with respect to the axis X as the rotating shaft 15 rotates, and a cylinder 44 having the compression chamber C1 formed therein.

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

The two cylinders 44 sandwiching the separate plate 45 are sandwiched 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).
An oil pump 49 is provided below the cylinder 44 and is fixed by bolts (not shown).
The oil pump 49 draws oil from an oil reservoir in the lower part of the housing 11 and guides the oil to the scroll-side bearing 31 side via an oil supply hole 15 a that penetrates along the axis X of the rotating shaft 15 .

The scroll compression mechanism 13 is provided 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 disposed below the fixed scroll 51 and facing the fixed scroll 51 .

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 protruding downward from the end plate 52 .
A discharge hole 52a is formed in the center of the end plate 52 (near the axis X) so as to penetrate along the axis X.

The orbiting scroll 57 is disposed so as to be sandwiched between the scroll-side bearing 31 and the fixed scroll 51 in the direction of the axis X.
The orbiting scroll 57 has an end plate 58 connected to the eccentric shaft portion 56 of the rotary shaft 15 and an orbiting wrap 59 protruding upward from the end plate 58 .

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 pivots eccentrically about the axis X as the rotating shaft 15 rotates.

The orbiting wrap 59 meshes with the fixed wrap 53 to form a compression chamber C2 between the fixed wrap 53 and the orbiting wrap 59, which compresses the refrigerant Rf.

A balance weight chamber 63 is formed between a 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 rotary shaft weight 54 rotates together with the rotary shaft 15 .

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

The refrigerant Rf compressed by the rotary compression mechanism 12 and discharged into the housing 11 is sucked into the compression chamber C2 from the outer periphery side 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 a discharge hole 52 a formed in the fixed scroll 51 and the discharge pipe 34 .

A cover 48 is provided below the scroll side bearing 31 so as to cover the scroll side bearing 31 .
The cover 48 is formed by sheet metal processing and has a cylindrical shape whose diameter increases stepwise from the bottom to the 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 rotating shaft 15 in the circumferential direction relative 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, and the refrigerant sucked through the suction opening 48 a is guided to the scroll compression mechanism 13 .

An oil level tank 60 is provided below and outside the housing 11 .
The oil level tank 60 is a hollow container that communicates with the inside of the housing 11 via a lower pipe 61 provided at the bottom and a pressure equalizing pipe 62 provided 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 guided from an oil reservoir inside the housing 11 through a lower pipe 61 into the oil level tank 60 , and the oil level in the oil reservoir can be measured by a level gauge installed in a socket 65 .

An oil return pipe 67 is provided inside the housing 11 and extends vertically while contacting the inner wall of the housing 11. The oil return pipe 67 is fixed at its upper end to the scroll-side bearing 31 and is provided so that its lower end is located in the oil reservoir at the bottom of the housing 11.

[Connection mechanism]
Next, the hermetic terminals (terminal portions) 110, 120, 130 provided in 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 A-A.

As shown in Figures 2, 3 and 5, the compressor 1 includes three hermetic terminals 110, 120, 130 and a connection mechanism 200. The compressor 1 also includes a terminal guard 500 that is erected on the side of the main body 21 and surrounds the three hermetic terminals 110, 120, 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, 21C. The hermetic terminal 110 is inserted into the through hole 21A, the hermetic terminal 120 is inserted into the through hole 21B, and the hermetic terminal 130 is inserted into the through hole 21C.

The hermetic terminals 110, 120, and 130 are joined by welding to the through holes 21A, 21B, and 21C, respectively. The hermetic terminals 110, 120, and 130 are sealed so that the sealed space CS does not communicate with the external space OS.

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, the V-phase cable 320, and the W-phase cable 330.

As shown in FIG. 3, the connection mechanism 200 has three bus bars 210, 220, and 230, a terminal block 240, and nine connecting cables 251, 252, 253, 254, 255, 256, 257, 258, and 259.

The three bus bars 210, 220, 230 are each a member formed from a conductive metal material. One U-phase cable 310 is electrically connected to the bus bar 210 via a crimp terminal 311. One V-phase cable 320 is electrically connected to the bus bar 220 via a crimp terminal 321. One W-phase cable 330 is electrically connected to the bus bar 230 via a crimp terminal 331.

The terminal block 240 is a structure to which the bus bars 210, 220, and 230 are fixed and to which the main body portion 21 of the housing 11 is installed. The terminal block 240 installs the bus bars 210, 220, and 230 on the main body portion 21 of the housing 11 so that they are kept insulated from the main body portion 21 of the housing 11.

Three connecting cables 251, 254, 257 connected to hermetic terminals 110, 120, 130 are connected to bus bar 210 via crimp terminals 251a, 254a, 257a. Three connecting cables 252, 255, 258 connected to hermetic terminals 110, 120, 130 are connected to bus bar 220 via crimp terminals. Three connecting cables 253, 256, 259 connected to hermetic terminals 110, 120, 130 are connected to bus bar 230 via crimp terminals 253a, 256a, 259a.

As shown in FIG. 3, three connecting cables 251, 254, and 257 are connected to the bus bar 210. The connecting cable 254 is connected to the bus bar 210 at the position of the crimp terminal 254a, which is not passed by the straight line L2 connecting the position of the crimp terminal 251a where the connecting cable 251 is connected to the bus bar 210 and the position of the crimp terminal 257a where the connecting cable 257 is connected to the bus bar 210.

Here, three connecting cables are connected to each of the bus bars 210, 220, and 230, but other configurations are also possible. For example, each of the hermetic terminals 110, 120, and 130 may have any number of pins, which may be three or more, and each of the bus bars 210, 220, and 230 may have any number of connecting cables, which may be three or more.

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

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

The electric motor 14 of this embodiment is a three-phase AC motor having a U-terminal, a V-terminal, and a W-terminal. The three pins of the hermetic terminal 110 inserted into the through hole 21A are connected to the U-terminal, the V-terminal, and the W-terminal 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-terminal, the V-terminal, and the W-terminal 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-terminal, the V-terminal, and the W-terminal of the electric motor 14, respectively.

Three through holes are formed in the terminal block 111 corresponding to the hermetic terminal 110, and a corresponding strap is inserted into each through hole. The three straps 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 corresponding to the hermetic terminal 120 has three through holes formed therein, and a corresponding strap is inserted into each through hole. The three straps fixed to the hermetic terminal 120 are connected to the bus bar 220 by three connecting cables 252, 255, and 258.
Three through holes are formed in the terminal block 113 corresponding to the hermetic terminal 130, and a corresponding strap is inserted into each through hole. The three straps fixed to the hermetic terminal 130 are connected to the bus bar 230 by three connecting cables 253, 256, and 259.

As shown in FIG. 4, the connection mechanism 200 has a terminal cover 600. The terminal cover 600 protects the three bus bars 210, 220, and 230, the terminal block 240, and the nine connecting cables 251, 252, 253, 254, 255, 256, 257, 258, and 259 from exposure to the outside. FIGS. 2 and 3 show the connection mechanism 200 with the terminal cover 600 removed.

[Terminal guards and terminal covers]
A terminal guard 500 and a terminal cover 600 according to one embodiment of the present disclosure will now be described with reference to FIGS.
FIG. 6 is a perspective view showing the vicinity of a terminal guard 500 according to one embodiment of the present disclosure.
The terminal guard 500 is a fence-like member that is fixed to the side surface of the substantially cylindrical main body 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 portion) 501 located above the ground surface of the compressor, a rectangular lower wall portion (wall portion) 502 located below the upper wall portion 501 with respect to the ground surface, and two side wall portions (wall portions) 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.

The upper wall portion 501 has curved surfaces (side portions) 501a that are curved downward at approximately right angles at both ends in the horizontal direction in FIG. 6. The curved surfaces 501a at both ends overlap with the upper regions of the side wall portions 503.

The upper surface of the upper wall portion 501 has a protrusion 504 formed by bending part of the front end portion 501c on the opposite side of the main body portion upward into an L-shape. One protrusion 504 is provided on each side of the upper wall portion 501. The protrusion 504 engages with an engagement hole 604 of the terminal cover 600 described below.

The lower wall portion 502 is the wall portion located on the lower side of the terminal guard 500, which is the side facing the ground of the compressor, and has a rectangular shape similar to the upper wall portion 501. The lower wall portion 502 has curved surfaces (side portions) 502a, both ends of which are curved upward at approximately right angles in the horizontal direction in FIG. 6. The curved surfaces 502a at both ends overlap the lower regions of the side wall portions 503.

In addition, on the underside of the lower wall portion 502, insertion holes 508 are provided for each cable to pass the U-phase cable, V-phase cable, W-phase cable, and earth cable through the inside of the terminal guard 500.

The two ends of the side wall 503 in the vertical direction are connected to the curved surface 501a of the upper wall 501 and the curved surface 502a of the lower wall 502, respectively, so as to close the gap between the curved surface 501a of the upper wall 501 and the curved surface 502a of the lower wall 502. In this way, by connecting the side wall 503 to the upper wall 501 and the lower wall 502, the terminal guard 500 has an opening on the opposite side 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. In addition, since the terminal guard 500 has an opening in a direction 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.

Also, a notch 505 is provided at a position surrounded by a dashed ellipse in Fig. 6, i.e., at a corner 507 of a bent portion 501b of the upper wall portion 501. Fig. 7 is a cross-sectional view of the terminal guard 500 and its surroundings according to an embodiment of the present disclosure. Specifically, Fig. 7(a) is a cross-sectional view of a case where a notch 505 is not provided at a corner 507 of a bent portion 501b of the upper wall portion 501. Also, Fig. 7(b) is a cross-sectional view of a case where a notch 505 is provided at a corner 507 of a bent portion 501b of the upper wall portion 501.
As shown in Fig. 7(b) , a notch 505 is provided at a corner 507 of each bent portion 501b on both sides of the upper wall portion 501. By providing the notch 505 at the corner 507, that is, by providing an empty space in the access direction to the hermetic terminal (the direction of the two-dot chain line in Fig. 7(b) ), it becomes easier for a worker to access the hermetic terminal when attaching a terminal block or a cable to the hermetic terminal, and the workability of assembly or maintenance can be improved.
In this embodiment, a case where the notch 505 is provided at the corner 507 of the bent portion 501b of the upper wall portion 501 will be described as an example, but the technical scope of the present disclosure is not limited to this example, and the notch 505 may not be provided as in Fig. 7(a). In addition, the shape and dimensions of the notch 505 are not limited to this example and may be appropriately changed according to design requirements, etc.

Figure 8 is a perspective view of a terminal cover 600 according to an 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 sealing wall portion 602 that is flat and covers the opening of the terminal guard. Specifically, the overlapping wall portion 601 is formed by standing upright from each of the three sides of the sealing wall portion 602. The terminal cover 600 is manufactured, for example, by sheet metal processing.

The overlapping wall portion 601 forms a U-shaped surface provided to form a space inside the terminal cover 600, and each wall portion 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 convex portion 504 at a position corresponding to the convex portion 504 of the upper wall portion 501 of the terminal guard 500.

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

FIG. 9 shows the terminal cover 600 attached to the terminal guard 500 .
9, the terminal cover 600 is attached to the terminal guard 500 with the overlapping wall portion 601 overlapping and closely fitting with the upper wall portion 501 and the side wall portion 503. In addition, when the terminal cover 600 is attached to the terminal guard 500, the opening of the terminal guard 500 is covered with the sealing wall portion 602. The terminal cover 600 is formed with dimensions corresponding to the shape and dimensions of the terminal guard 500, and is attached to the terminal guard so as to be in close contact with the terminal guard. This allows the dimensions of the terminal guard 500 and the terminal cover 600 to be minimized.

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

In addition, 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.

Fig. 10 shows a modified example of the terminal cover 600. As shown in Fig. 10, the terminal cover 600 may be provided with a seal member 605 (hatched portion in Fig. 10) 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 gaps 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 di rubber (EPDM), and is adhered to the overlapping wall portion 601 using an adhesive such as double-sided tape.

In this way, by providing the sealing member 605 on the overlapping wall portion 601, even if a gap occurs between the overlapping wall portion 601 and the upper wall portion and the side wall portion of the terminal guard due to the cumulative tolerance of each part, the gap can be sealed with 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 the terminal cover 600.

The range in which the sealing member 605 that seals the gap between the overlapping wall portion 601 and the upper wall portion and side wall portion of the terminal guard is provided may be changed as appropriate. For example, in the example of FIG. 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 edge of the overlapping wall portion 601 and around the engagement hole 604. Also, the sealing member 605 may not be provided on the overlapping wall portion 601, but may be provided on the upper wall portion 501 or the side wall portion 503 of the terminal guard 500.

According to the above-described embodiment, the following advantageous effects are achieved.
The terminal cover 600 is attached to the terminal guard 500 in such a manner that the overlapping wall portion 601 overlaps and closely contacts the three wall portions 501, 503 of the upper wall portion 501 and the side wall portion 503. That is, the terminal cover 600 is formed with dimensions corresponding to the shape and dimensions of the terminal guard 500, and is attached to the terminal guard 500 in such a manner that it closely contacts the terminal guard 500. This allows the dimensions of the terminal guard 500 and the terminal cover 600 to be minimized.

In addition, 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, so that when the terminal cover 600 is attached to the terminal guard 500, it is possible to prevent as much as possible the intrusion of fluids such as water generated by condensation into the inside of the terminal guard 500. In other words, it is possible to prevent deterioration and failure of the three hermetic terminals 110, 120, and 130.

In addition, a protrusion 504 is provided on the upper surface of the upper wall portion 501 of the terminal guard 500, in which part of the front end portion 501c in the direction of protruding opposite to the main body portion is bent upward into an L-shape, and the terminal cover 600 is attached to the terminal guard 500 by engaging the protrusion 504 with an engagement hole 604 provided in the terminal cover 600. In this way, the protrusion 504 and the engagement hole 604 form an engagement portion, so that the worker can easily and efficiently attach or remove the terminal cover 600 to or from the terminal guard 500 when performing maintenance on the compressor.

In addition, 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, when attaching a terminal block or cable to the hermetic terminals 110, 120, 130 located inside the terminal guard 500, a worker can easily access the hermetic terminals, improving the workability of assembly or maintenance.

In addition, by providing a seal member 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.

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

<Additional Notes>
The electric compressor and the air conditioner including the electric compressor described in the above-described embodiment can be understood, for example, as follows.
The electric compressor (1) of the present disclosure comprises a housing (11) that accommodates a compression mechanism, a plurality of terminal portions (110, 120, 130) that are fixed in a state in which the inside and outside of the housing are airtightly sealed, a terminal guard (500) having a plurality of planar wall portions (501, 502, 503) erected relative to the housing and having an opening formed by connecting the sides of these wall portions, and a terminal cover (600) that has an overlapping portion (601) on the wall portion of the terminal guard and covers the opening, and one of the wall portions of the terminal guard is provided with an engagement portion that engages with the terminal cover.

According to the electric compressor according to the first aspect of the present disclosure, an engagement portion is provided on one wall of the terminal guard that surrounds the multiple terminals, and the terminal cover can be attached to the terminal guard starting from this engagement 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 an overlapping portion with each wall of the terminal guard. The terminal cover is formed with 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 allows the dimensions of the terminal guard and the terminal cover to be minimized. In addition, when the terminal cover is attached, it is possible to prevent as much as possible the intrusion of fluids such as water generated by condensation into the inside of the terminal guard, and thus to prevent deterioration and failure of the terminals. In addition, since the terminal cover engages with the terminal guard through an engagement portion provided on one wall of the terminal guard, the terminal cover can be easily and efficiently attached and removed when an operator performs maintenance on the electric compressor.

In the electric compressor according to the second aspect of the present disclosure, in the first aspect, the engagement portion may be a protrusion (504) provided on the wall portion of the upper surface of the terminal guard.

According to the electric compressor of the present disclosure, the terminal guard and the terminal cover engage with each other via a protrusion provided on the wall of the upper surface of the terminal guard. This allows the worker to check the position of the engagement part from his/her viewpoint when aligning the large and heavy terminal cover when attaching it. This allows the worker to easily and efficiently attach and remove the terminal cover.

The electric compressor according to the third aspect of the present disclosure may be configured in the first or second aspect such that a notch (505) is provided at a corner of the wall portion on the upper surface of the terminal guard.

In the electric compressor according to the present disclosure, the corners of the wall of the upper surface of the terminal guard are provided with notches. This allows workers to easily access the terminals when attaching terminal blocks or cables to the terminals, improving the workability of assembly and maintenance.

The electric compressor according to the fourth aspect of the present disclosure may be any one of the first to third aspects, in which a seal member (605) is provided on the edge of the overlapping portion.

In the electric compressor according to the present disclosure, a seal member is provided on the edge of the overlapping portion. In other words, the ends of the surfaces where each wall surface of the terminal guard and the terminal cover come into contact are sealed with a seal member. This more reliably prevents fluids such as water generated by condensation from entering the airtight space formed by the terminal guard and the terminal cover.

The air conditioning device according to the fifth aspect of the present disclosure is equipped with the electric compressor of the present disclosure in any one of the first to fourth aspects.

1 Compressor 3 Leg 11 Housing 12 Rotary compression mechanism (low-stage compression mechanism)
13 Scroll compression mechanism (high stage compression mechanism)
Reference Signs List 14 Electric motor 15 Rotating shaft 15a Oil supply hole 21 Main body 21A, 21B, 21C Through hole 22 Upper cover 23 Lower cover 31 Scroll side bearing 32A Upper bearing 32B Lower bearing 33 Suction pipe 34 Discharge pipe 37 Rotor weight 38 Rotor 38a Rotor passage 38b Oil separation plate 39 Stator 41 Eccentric shaft portion 43 Rotary discharge pipe 44 Cylinder 48 Cover 48a Suction opening 49 Oil pump 51 Fixed scroll 52 End plate 52a Discharge hole 53 Fixed wrap 54 Rotating shaft weight (balance weight)
55 Drive bush 56 Eccentric shaft portion 57 Orbiting scroll 58 End plate 59 Orbiting wrap 60 Oil level tank 61 Lower piping 62 Pressure equalizing pipe 63 Balance weight chamber 65 Socket 67 Oil return pipe 110, 120, 130 Hermetic terminal 111, 112, 113 Terminal block 200 Connection mechanism 210 Bus bar 220 Bus bar 230 Bus bar 240 Terminal block 251, 252, 253, 254, 255, 256, 257, 258, 259 Connection cable 251a, 253a, 257a, 259a Crimp terminal 310 U-phase cable 311, 321, 331 Crimp terminal 320 V-phase cable 330 W-phase cable 500 Terminal guard 501 Upper wall portion 501a Bending surface 501b Bending portion 501c Front end portion 502 Lower wall portion 502a Bend surface 503 Side wall portion 504 Convex portion 505 Notch 507 Corner portion 508 Insertion hole 600 Terminal cover 601 Overlapping wall portion 602 Sealing wall portion 604 Engagement hole 605 Seal member CS Sealed space OS Outside space Rf Refrigerant X Axis

Claims (5)

a housing that accommodates a compression mechanism;
a plurality of terminals fixed in a state in which the inside and the outside of the housing are hermetically sealed;
a terminal guard having a plurality of planar wall portions erected on the housing, the side portions of the wall portions being connected to each other to entirely surround the plurality of terminal portions while having an opening;
a terminal cover having an overlapping portion with respect to the wall portion of the terminal guard to cover the opening;
Equipped with
An electric compressor, wherein one of the walls of the terminal guard is provided with an engagement portion that engages with the terminal cover. The electric compressor according to claim 1, wherein the engagement portion is a protrusion provided on the wall portion of the upper surface of the terminal guard. The electric compressor according to claim 1, wherein a notch is provided at the corner of the wall portion on the upper surface of the terminal guard. The electric compressor according to claim 1, wherein a seal member is provided on the edge of the overlapping portion. An air conditioner comprising the electric compressor according to claim 1.